CN115680545A - Steel coiled tubing underground cable passes through bypass nipple joint - Google Patents
Steel coiled tubing underground cable passes through bypass nipple joint Download PDFInfo
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- CN115680545A CN115680545A CN202110854973.1A CN202110854973A CN115680545A CN 115680545 A CN115680545 A CN 115680545A CN 202110854973 A CN202110854973 A CN 202110854973A CN 115680545 A CN115680545 A CN 115680545A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 210000002445 nipple Anatomy 0.000 title description 6
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 210000000664 rectum Anatomy 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 12
- 230000008602 contraction Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 210000001624 hip Anatomy 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000013475 authorization Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention relates to a steel continuous pipe underground cable crossing bypass short section which comprises an outer pipe, wherein a central channel, an eccentric channel and an inclined channel are arranged in the outer pipe. An upper garland and a lower garland are arranged in the central passage, and both the upper garland and the lower garland are provided with a central hole through which a cable can pass and a plurality of oil passing holes arranged around the central hole. Be connected with the slips connector between last wreath and lower wreath, the interior latus rectum of slips connector just to setting up and can pass with the power cable with the centre bore, has the slips that can radially contract and the inner wall has the tooth in the slips connector, and the slips is the shrink state and sets up and the tooth can bite into the cable. The invention can simultaneously satisfy the functions of fixing, sealing and passing through the bypass of the underground cable, can ensure the through-current drift diameter, and has simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of oil extraction or operation of a steel continuous pipe with a built-in cable, in particular to a bypass nipple for passing a steel continuous pipe underground cable.
Background
Coiled tubing has found widespread use in various oil and gas wells as the mainstream form of transportation means in current oil and gas production construction and operations. In visual well logging and continuous pipe oil extraction operations, a power cable and a signal cable are connected from a well head to an underground submersible electric pump for butt joint. The traditional rodless oil production mode is directly connected with an electric submersible pump by binding a cable outside a pipe, and the cable is extremely easy to be damaged. The cable adopts the form of interior cable of wearing under current coiled tubing technique, under the mature condition of current oil well cable technology, the security of cable has obtained very big guarantee. But the electric submersible pump is different from an inner through cable, and needs to pass through underground, correspondingly needs to pass through a bypass tool and complete the suspension and sealing of the cable.
The following patents are mainly applied to the cable crossing: one is a Chinese utility model patent with the publication number of CN 210948537U and publication date of 2020, 7 and 7, and the fixing and the limiting are completed through a pull rope and a positioning groove; the Chinese utility model patent with the authorization notice number of CN 210866621U and the authorization notice date of 26.6.2020 adopts the pin connection and the double sealing; the patent of the Chinese utility model with the authorization notice number of CN208461432U and the authorization notice date of 2019, 2 months and 1 days is sealed by a copper ball. However, these methods only provide solutions for sealing and suspending the cables, and are expensive to manufacture, making it difficult to ensure the passage of the pipes with limited space allowed. The other is a Chinese utility model patent with an authorization notice number of CN 202850883U and an authorization notice date of 2013, 4 and 3, and provides an underground cable bypass joint device which is simple and compact in structure, but lacks of sealing measures, and annular gas and liquid easily enter the interior. One is the Chinese invention patent with the publication number of CN 111326865A and the publication date of 2020, 6 and 23, which completes the connection function of the power cable, but the connection mode is difficult to ensure the drift diameter of the pipeline after being installed in a tool; the utility model discloses a cable has been accomplished in the china utility model patent of the grant announcement number CN 204827415U, grant announcement date 2015 year 12 months 2 days and has passed through and sealed, nevertheless lacks the fixed establishment of cable, and the cable easily produces in the instrument and rocks, influences the life of cable. The above patents cannot simultaneously satisfy the functions of fixing, sealing and passing through the bypass of the underground cable. And the existing patent has more complex structure and high manufacturing and installation cost.
Aiming at the requirements of oil extraction and operation of a steel continuous pipe with a built-in cable, the cable needs to pass through the inside of an oil pipe to complete the function of connecting the bypass penetrating cable with a leading cable of an electric pump, and meanwhile, the cable also needs to complete underground fixation. Corresponding devices or tools and associated sealing methods are currently lacking.
Therefore, the inventor provides a steel coiled tubing downhole cable passing bypass short joint by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a steel continuous pipe underground cable passing-through bypass short section, which can simultaneously meet the functions of fixing, sealing and passing-through bypass of an underground cable, can ensure an overflowing drift diameter, and has the advantages of simple structure and low cost.
The invention aims to realize that a steel continuous pipe underground cable passes through a bypass short section, which comprises an outer pipe; the outer tube is internally provided with a central channel positioned at the upper part of the outer tube, and an eccentric channel and an oblique channel positioned at the lower part of the outer tube, and the eccentric channel and the oblique channel are both communicated with the central channel; the central channel is upwards communicated with the upper end of the outer tube, the axis of the eccentric channel deviates from the central line of the central channel, and the lower part of the eccentric channel is communicated with the center of the lower end of the outer tube after being deflected; a notch is formed in the outer side wall of the lower part of the outer pipe, the lower end of the inclined channel is communicated with the notch, and a cable can pass through the inclined channel in a sealing manner; an upper garland and a lower garland which are vertically spaced are arranged in the central channel, and both the upper garland and the lower garland are provided with a central hole through which a cable can pass and a plurality of oil passing holes which are arranged around the central hole; be connected with the slips connector between last wreath and lower wreath, the interior latus rectum of slips connector just to setting up and can pass with the power cable with the centre bore, has the slips that can radially contract and the inner wall has the tooth in the slips connector, and the slips is the shrink state and sets up and the tooth can bite into the cable.
In a preferred embodiment of the invention, the slip connector further comprises an upper connecting pipe and a lower connecting pipe, wherein the upper connecting pipe and the lower connecting pipe are axially limited between the upper wreath and the lower wreath; the inside of the upper connecting pipe is provided with an inner conical surface with the diameter gradually expanding downwards, the outer wall of the slip is an outer conical surface matched with the inner conical surface, and the slip is arranged in the upper connecting pipe in a shrinkage state in a penetrating way; the outer wall of the upper end of the lower connecting pipe is in threaded connection with the inner wall of the lower end of the upper connecting pipe, and the upper end of the lower connecting pipe can abut against the slip.
In a preferred embodiment of the invention, the slips are conical tubes with longitudinal cuts, teeth are formed on the inner wall of the conical tube, and an outer conical surface is formed on the outer wall of the conical tube; a plurality of slots are formed on the pipe wall of the conical pipe body, and the slots extend to one end of the conical pipe body.
In a preferred embodiment of the present invention, the plurality of slits include a plurality of first slits and a plurality of second slits arranged in a staggered manner, the first slits extend upward to the upper end of the tapered tube, and the second slits extend downward to the lower end of the tapered tube.
In a preferred embodiment of the invention, the upper end of the lower adapter tube is fixedly connected with the lower end of the slip in the circumferential direction.
In a preferred embodiment of the present invention, the upper connection pipe includes an outer sheath and an inner taper sleeve, the outer sheath has a stepped mounting hole with a diameter expanding downward inside, the inner taper sleeve is inserted into the stepped mounting hole and can abut against a top hole shoulder of the stepped mounting hole, and the inner taper surface is formed on an inner wall of the inner taper sleeve.
In a preferred embodiment of the invention, an upper stepped hole with an enlarged diameter is formed downwards at the lower part of the central hole of the upper garland, an upper convex ring is formed at the upper end of the upper connecting pipe, and the upper convex ring can be inserted into the upper stepped hole and can be propped against the top hole shoulder of the upper stepped hole; the upper part of the central hole of the lower garland upwards forms a lower stepped hole with enlarged diameter, the lower end of the lower connecting pipe is provided with a lower convex ring, and the lower convex ring can be inserted into the lower stepped hole and can abut against the bottom hole shoulder of the lower stepped hole.
In a preferred embodiment of the present invention, an upper limit step and a lower limit step are formed on the inner wall of the outer tube, and the upper garland and the lower garland can respectively abut against the upper limit step and the lower limit step.
In a preferred embodiment of the present invention, the outer tube includes an upper tube body and a lower tube body which are hermetically connected up and down, a portion of the central passage is formed in the upper tube body, another portion of the central passage is formed in an upper portion of the lower tube body, and the eccentric passage and the inclined passage are formed in a lower portion of the lower tube body; the gap is formed on the outer wall of the lower pipe body, and the upper garland and the lower garland are respectively arranged in the upper pipe body and the lower pipe body.
In a preferred embodiment of the invention, a through stepped hole with an increased hole diameter is formed downwards at the lower part of the inclined channel, an upper pressing ring, a rubber cylinder, a lower pressing ring and a hollow bolt are sequentially embedded in the through stepped hole from top to bottom, the hollow bolt is in threaded connection with the wall of the through stepped hole, and the hollow bolt can be abutted against the lower pressing ring.
In a preferred embodiment of the present invention, the angle between the axis of the oblique passage and the axis of the outer tube is 5 to 10 °.
In a preferred embodiment of the present invention, a cross section of the notch in a plane where an axis of the eccentric channel and an axis of the oblique channel are located is trapezoidal, a lower bottom of the trapezoid corresponds to an opening end of the notch, two waists of the trapezoid are both oblique sides, and one oblique side is communicated with a lower end of the oblique channel and is perpendicular to the axis of the oblique channel.
In a preferred embodiment of the present invention, the angle between the oblique side of the trapezoid away from the oblique channel and the axis of the outer tube is less than or equal to 30 °.
According to the invention, the underground cable of the steel continuous pipe passes through the bypass short section, and the teeth can bite the cable through the radial contraction of the slip in the slip connector, so that the cable can be suspended and fixed stably; through the matching of the central holes of the upper garland and the lower garland and the plurality of oil passing holes on the periphery of the upper garland and the lower garland, the overflowing diameter in the tool is ensured under the condition that the cable is fixed inside, the requirement of a milling process on the outer pipe is avoided, and the production cost is reduced; by matching the eccentric channel and the oblique channel, the bypass penetration of the cable is realized, and the connection of the lower end of the whole bypass short section and other tool strings is not influenced; meanwhile, the inclined channel has a sealing function, and the phenomenon that gas and liquid in the oil sleeve annulus enter the outer pipe when the inclined channel is used is avoided. The whole bypass short section simultaneously satisfies the functions of fixing, sealing and passing through the bypass of the underground cable, can ensure the overflowing drift diameter, has simple structure and low manufacturing and installation cost, can penetrate the cable into the continuous pipe, is connected with the electric submersible pump cable in the shaft bottom in a mode of passing through the cable by the continuous pipe, can obviously reduce the damage of the cable in the operation process, and improves the safety and the efficiency of the operation.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1: the invention provides a cross-sectional view of a steel coiled tubing underground cable passing through a bypass short section.
FIG. 2: is a cross-sectional view of the outer tube provided by the present invention.
FIG. 3: the invention provides a section view of an upper wreath.
FIG. 4 is a schematic view of: which is a bottom view of the upper wreath of fig. 3.
FIG. 5: the invention provides a cross section of a lower wreath.
FIG. 6: an enlarged view of a portion of the slip connector of figure 1 is shown.
FIG. 7 is a schematic view of: is a perspective view of the slips provided by the present invention.
FIG. 8: a cross-sectional view of a slip is provided in accordance with the present invention.
FIG. 9: a top view of the slip of figure 8.
FIG. 10: is a first perspective view of the lower connecting pipe provided by the invention.
FIG. 11: the invention provides a second perspective view of the lower connecting pipe.
FIG. 12: the invention provides a cross section of a lower connecting pipe.
FIG. 13: which is a top view of the lower adapter in fig. 12.
The reference numbers illustrate:
1. an outer tube; 11. a central channel; 12. an eccentric channel; 121. an axial channel; 122. an inclined channel; 13. an oblique channel; 131. passing through the stepped hole; 14. a notch; 15. a pipe body is arranged; 151. an upper limiting step; 16. a lower pipe body; 161. a lower limiting step; 17. a seal ring;
21. mounting a flower ring; 211. an upper stepped hole; 22. a flower ring is arranged; 221. a lower stepped hole; 23. a central bore; 24. an oil passing hole;
3. a slip connector;
31. an upper connecting pipe; 311. an outer sheath; 3111. a stepped mounting hole; 3112. an upper convex ring; 312. an inner taper sleeve; 3121. an inner conical surface;
32. slips; 321. teeth; 322. an outer conical surface; 323. a longitudinal cut; 324. slotting; 3241. first slotting; 3242. performing second slotting; 325. a groove;
33. a lower connecting pipe; 331. a protrusion; 332. a lower convex ring;
4. pressing a ring;
5. a rubber cylinder;
6. a lower pressure ring;
7. and (4) a hollow bolt.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 13, the present embodiment provides a steel coiled tubing downhole cable crossing bypass sub, which comprises an outer tube 1. The outer tube 1 has a central passage 11 at an upper portion thereof and an eccentric passage 12 and an inclined passage 13 at a lower portion thereof, and the eccentric passage 12 and the inclined passage 13 are communicated with the central passage 11. The central channel 11 is communicated with the upper end of the outer tube 1 upwards, the axis of the eccentric channel 12 deviates from the central line of the central channel 11, and the lower part of the eccentric channel 12 is communicated with the center of the lower end of the outer tube 1 after being deflected. The outer side wall of the lower part of the outer tube 1 is provided with a gap 14, the lower end of the inclined channel 13 is communicated with the gap 14, and the inclined channel 13 can be internally and hermetically penetrated by a cable. An upper garland 21 and a lower garland 22 are arranged in the central passage 11 at intervals up and down, and each of the upper garland 21 and the lower garland 22 has a central hole 23 through which a cable can pass and a plurality of oil passing holes 24 arranged around the central hole 23. A slip connector 3 is connected between the upper garland ring 21 and the lower garland ring 22, the inner drift diameter of the slip connector 3 is opposite to the central hole 23 and can be penetrated by a cable, a slip 32 which can radially contract and has teeth 321 on the inner wall is arranged in the slip connector 3, the slip 32 is arranged in a contraction state, and the teeth 321 can bite the cable.
It can be understood that the central line of the central channel 11 is the central line of the outer tube 1, the eccentric channel 12 and the oblique channel 13 are arranged side by side, and a certain included angle is formed between the axis of the oblique channel 13 and the central line of the central channel 11. The gap 14 may be relatively long and the length of the inclined passage 13 is relatively short, so as to facilitate the processing and installation, and the specific dimension is determined according to the requirement. The inclined channel 13 is used for penetrating out a cable, the eccentric channel 12 is used for passing oil, and the eccentric channel 12 is deflected midway and is communicated to the center of the lower end of the outer tube 1, so that the eccentric channel is connected with other tool strings when being used conveniently. The aperture of the central hole 23 of each garland is matched with the armor pipe of the armored cable and is slightly larger than the outer diameter of the armor pipe, when the cable is used, the cable passes through the central hole 23, and oil mainly passes through the oil passing holes 24 on the periphery. The number and shape of the oil passing holes 24 can be selected according to actual conditions, for example, in the embodiment, as shown in fig. 4, the oil passing holes 24 are kidney-shaped holes, and the upper and lower flower rings 21 and 22 are provided with four oil passing holes 24. The teeth 321 on the slips 32 may be serrated or otherwise shaped to provide a secure grip on the cable after the slips 32 are radially retracted. The tooth tip distance of the side teeth 321 in the slip 32 is matched with the size of an armored pipe of an armored cable, and the tooth tip 321 of the slip 32 bites the armored pipe of the armored cable to realize a hanging function. During installation, after the cable is threaded through the slip connector 3, the slips 32 are adjusted to be in a contracted state, and the cable can be fixed by the slips 32.
Therefore, the underground cable of the steel coiled tubing in the embodiment passes through the bypass short section, and the teeth 321 can bite the cable through the radial contraction of the slip 32 in the slip connector 3, so that the cable can be suspended and fixed stably; through the matching of the central holes 23 of the upper garland 21 and the lower garland 22 and the plurality of oil passing holes 24 on the periphery, the flow-passing diameter in the tool is ensured under the condition that the cable is fixed inside, the requirement of a milling process on the outer pipe 1 is avoided, and the production cost is reduced; by matching the eccentric channel 12 and the oblique channel 13, bypass crossing of the cable is realized, and connection of the lower end of the whole bypass short section and other tool strings is not influenced; meanwhile, the inclined channel 13 has a sealing function, and the phenomenon that gas and liquid in the oil sleeve annulus enter the outer pipe 1 in use is avoided. Whole bypass nipple joint has satisfied the fixed of cable in the pit, sealed and has passed through the function of bypass simultaneously to can guarantee to flow through the latus rectum, and simple structure, it is low to make and the installation cost, can penetrate the cable intraduct in the continuum, is connected with the oily charge pump cable of diving by the mode that the cable passed through in the well bottom by the continuum, can show the harm that reduces the cable and receive at the operation in-process, improves the security and the efficiency of operation.
It should be noted that, the above-below orientation refers to the above-below orientation of the bypass sub when vertically placed along the axial direction of the outer pipe 1 shown in fig. 1, and the expressions "top", "bottom", "upper", "lower" and the like are mentioned herein for illustrative purposes only and do not represent the only implementation manner; this bypass nipple joint both can vertically place when in actual use, also can place according to other directions, and concrete as required and decide, bypass nipple joint is vertical according to the axial of outer tube 1 during general practical application places mostly.
In a particular implementation, to facilitate adjustment of the slips 32 to a contracted state during installation, the slip connector 3 further includes an upper adapter 31 and a lower adapter 33, as shown in fig. 1, 6 and 7, with the upper adapter 31 and the lower adapter 33 being axially captured between the upper wreath 21 and the lower wreath 22. The inside of the upper connecting pipe 31 is provided with an inner conical surface 3121 with a diameter gradually expanding downwards, the outer wall of the slip 32 is an outer conical surface 322 matched with the inner conical surface 3121, and the slip 32 is arranged in the upper connecting pipe 31 in a shrinkage state. The outer wall of the upper end of the lower connecting pipe 33 is in threaded connection with the inner wall of the lower end of the upper connecting pipe 31, and the upper end of the lower connecting pipe 33 can be abutted against the slips 32.
In order to allow smooth radial contraction of the slips 32, as shown in fig. 7 to 9, the slips 32 are tapered tubular bodies having longitudinal slits 323, teeth 321 are formed on the inner walls of the tapered tubular bodies, and outer tapered surfaces 322 are formed on the outer walls of the tapered tubular bodies. A plurality of slits 324 are formed in the wall of the conical tube body, and the slits 324 extend to one end of the conical tube body. Due to the existence of the longitudinal cuts 323 and the plurality of slots 324, the slip 32 forms a multi-petal structure, gaps are reserved between every two petals, so that the conical pipe body has certain elasticity, and the radial contraction or expansion of the whole slip 32 can be realized by utilizing the width change of the longitudinal cuts 323 and the gap width change of the slots 324.
More specifically, the outer tapered surface 322 of the slip 32 and the inner tapered surface 3121 of the upper connecting pipe 31 have the same taper and are fitted to each other in use, and the inner tapered surface 3121 has an axial length slightly longer than that of the slip 32. Meanwhile, when the outer tapered surface 322 of the slip 32 naturally fits the inner tapered surface 3121 of the upper connection pipe 31 (i.e., the slip 32 is in a state of being naturally expanded and not radially contracted), a certain distance (referred to as a first distance) should be formed between the upper end of the slip 32 and the step at the upper end of the inner tapered surface 3121 of the upper connection pipe 31; when the lower connecting pipe 33 is just engaged with the slip 32 in the process of screwing the upper connecting pipe 31, a certain distance (marked as a second distance) should be reserved between the thread step of the lower connecting pipe 33 (specifically, the lowest end of the thread step) and the bottom end of the upper connecting pipe 31, and the second distance should be greater than the first distance; when the lower connecting pipe 33 continues to be screwed in, the slip 32 moves upwards, and as the diameter of the inner conical surface 3121 gradually decreases upwards, each segment of the slip 32 is pressed and reduced, so that the slip 32 is in a contraction state, the distance between the teeth points of the teeth 321 on the opposite side in the slip 32 decreases, and when the distance decreases to be smaller than the outer diameter of the armored pipe of the armored cable, the teeth points 321 of the slip 32 bite and bite the armored pipe of the cable tightly, the armored cable cannot move, and the cable is fixed.
Therefore, the whole slip connector 3 adopts the matching connection of the upper connecting pipe 31, the slips 32 and the lower connecting pipe 33, the slips 32 can be pushed to move by continuously screwing the lower connecting pipe 33, and the tightening of the lower connecting pipe 33 and the inner conical surface 3121 of the upper connecting pipe 31 can drive the shrinkage of the slips 32, thereby gripping the armored pipe of the cable. By means of the gripping action of the teeth 321 on the slips 32, the cable can be kept immovable and suspended reliably regardless of the upward or downward force applied to the cable. Moreover, when the cable is subjected to an upward pulling force, the slips 32 are pulled to move upwards along the inner conical surface 3121, so that the engagement becomes tighter and tighter, and on the one hand, the cable is fixed in the well, and on the other hand, the engagement of the slips 32 can enable the cable to be subjected to a larger pulling force, so that the cable is ensured to be stably suspended in the well.
In practical applications, in order to further improve the hanging effect of the cable, as shown in fig. 7, the plurality of slits 324 include a plurality of first slits 3241 and a plurality of second slits 3242 which are staggered, the first slits 3241 extend upward to the upper end of the tapered tube, and the second slits 3242 extend downward to the lower end of the tapered tube. In the process that the lower connecting pipe 33 is screwed in and drives the slip 32 to shrink, the first slit 3241 and the second slit 3242 which are distributed in a staggered mode are utilized, so that the shrinking deformation of the slip 32 is more uniform, the teeth 321 in the slip 32 can bite cables more uniformly, the situation that partial teeth 321 are tightly meshed and partial teeth 321 are loosely meshed is avoided, and the slip 32 can fix the cables more firmly.
Further preferably, the upper end of the lower pipe 33 is fixedly connected circumferentially with the lower end of the slips 32.
As shown in fig. 7 and 10, a plurality of grooves 325 are circumferentially arranged on the lower end surface of the slip 32 at intervals, a plurality of protrusions 331 are circumferentially arranged on the upper end of the lower adapter tube 33 at intervals, the shape of the protrusions 331 is matched with the shape of the grooves 325, and the protrusions 331 can be embedded in the grooves 325. For example, in this embodiment, four square grooves are symmetrically formed at the lower end of the slip 32, and four square protrusions are symmetrically formed at the upper end of the lower connection pipe 33. When the protrusion 331 is engaged with the groove 325, the lower connection pipe 33 and the slips 32 are circumferentially fixed, and the slips 32 can rotate when the lower connection pipe 33 is screwed in; if the cable tends to rotate during subsequent construction and production operations, the torque generated by the slips 32 can be borne by the lower connecting pipe 33 and the engaged threads through the matching of the groove 325 and the protrusion 331, so that the cable can be effectively prevented from being distorted and damaged.
Further, in order to improve the machining accuracy, as shown in fig. 6, the upper connection pipe 31 includes an outer jacket 311 and an inner taper sleeve 312, the outer jacket 311 has a stepped mounting hole 3111 with a diameter expanded downward inside, the inner taper sleeve 312 is inserted into the stepped mounting hole 3111 and can abut on the top hole shoulder of the stepped mounting hole 3111, and an inner taper surface 3121 is formed on the inner wall of the inner taper sleeve 312.
The inner diameter of the upper end of the outer sheath 311 and the inner diameter of the lower connecting pipe 33 should match the size of the armored pipe of the armored cable, and the first distance is specifically the distance between the upper end of the slip 32 and the top hole shoulder of the stepped installation hole 3111 when the outer conical surface 322 of the slip 32 naturally fits the inner conical surface 3121 of the upper connecting pipe 31. The upper connecting pipe 31 is formed by two parts, namely the outer sheath 311 and the inner taper sleeve 312, so that the processing of the inner taper surface 3121 is facilitated, and the precision of the inner taper surface 3121 can be improved. During installation, the inner cone 312 may or may not rotate relative to the outer sheath 311, but does not affect the holding effect of the slips 32 on the cable.
Further, in order to facilitate the axial fixation of the upper adapter 31 and the lower adapter 33, as shown in fig. 1, 3 and 5, an upper stepped hole 211 having an enlarged diameter is formed downward at a lower portion of the central hole 23 of the upper collar 21, and an upper male ring 3112 is formed at an upper end of the upper adapter 31, the upper male ring 3112 being insertable into the upper stepped hole 211 and being capable of abutting on a top hole shoulder of the upper stepped hole 211. A lower stepped hole 221 having an enlarged diameter is formed upwardly at an upper portion of the central hole 23 of the lower collar 22, and a lower collar 332 is formed at a lower end of the lower adapter 33, the lower collar 332 being insertable into the lower stepped hole 221 and being capable of abutting against a bottom hole shoulder of the lower stepped hole 221. It is understood that the upper snap ring 3112 is formed at the upper end of the outer sheath 311, the upper stepped hole 211 extends downward to the lower end surface of the upper snap ring 21, and the lower stepped hole 221 extends upward to the upper end surface of the lower snap ring 22.
In order to fix the upper and lower wrenches 21 and 22, as shown in fig. 1 and 2, an upper limit step 151 and a lower limit step 161 are formed on the inner wall of the outer tube 1, and the upper and lower wrenches 21 and 22 can respectively abut against the upper and lower limit steps 151 and 161, so that the upper and lower wrenches 21 and 22 can be respectively limited by the upper and lower limit steps 151 and 161.
For convenience of manufacture and installation, as shown in fig. 1 and 2, the outer tube 1 includes an upper tube body 15 and a lower tube body 16 which are hermetically connected up and down, a portion of the central passage 11 is formed in the upper tube body 15, the other portion of the central passage 11 is formed in an upper portion of the lower tube body 16, and the eccentric passage 12 and the inclined passage 13 are formed in a lower portion of the lower tube body 16. The notch 14 is formed in the outer wall of the lower tube body 16, and the upper and lower wrenches 21 and 22 are provided in the upper and lower tube bodies 15 and 16, respectively.
Generally, the outer wall of the lower end of the upper tube body 15 is in threaded connection with the inner wall of the upper end of the lower tube body 16, and a groove is formed in the connection position to achieve the purpose of sealing by adding a sealing ring 17, so that the leakage between the inner cavity of the outer tube 1 and external liquid is prevented; the upper pipe body 15 is of a middle-through structure, the upper end of the upper pipe body is provided with an oil pipe internal thread, and the upper pipe body can be connected with a downhole tool string; the lower end of the lower pipe body 16 is provided with an external thread of the oil pipe and can be connected with a tool string at the lower end. The upper limit step 151 and the lower limit step 161 are formed in the upper tubular body 15 and the lower tubular body 16, respectively. The sizes of the upper pipe body 15, the lower pipe body 16, the slip connector 3 and other parts are reasonably designed to ensure the suspension effect of the slip 32 on the cable; for example, during installation, when the lower snap ring 22 is engaged with the lower connection pipe 33, the distance between the step of the internal thread at the upper end of the lower pipe 16 and the step of the external thread at the lower end of the upper pipe 15 should be greater than the gap between the step of the internal thread at the lower end of the lower connection pipe 33 and the bottom end of the upper connection pipe 31, so as to ensure that the thread of the lower connection pipe 33 can be completely screwed until the thread sections of the upper connection pipe 31 and the lower connection pipe 33 are overlapped, thereby allowing the slips 32 to be fully engaged with the cable.
Therefore, the whole slip connector 3 is respectively matched with the top hole shoulder of the upper stepped hole 211 and the bottom hole shoulder of the lower stepped hole 221 through the upper convex ring 3112 of the upper connecting pipe 31 and the lower convex ring 332 of the lower connecting pipe 33, so that the whole slip connector 3 is fixed and limited, the cable caused by the vibration of the electric pump is prevented from shaking in the oil extraction process, and the use risk is reduced. Go up garland 21, lower garland 22 and slips connector 3 and carry on spacingly through the inside spacing space that upper limit step 151 and lower limit step 161 formed of outer tube 1 again, reach the effect that the part is fixed completely in the cavity through the threaded connection of last body 15 with lower body 16, satisfied the fixed, latus rectum of cable and spacing demand in the aspect of spacing simultaneously under the condition of letting in the cable inside.
Further, in order to ensure the sealing performance when the cable penetrates out of the inclined channel 13, as shown in fig. 1 and fig. 2, a through stepped hole 131 with an increased diameter is formed downwards at the lower part of the inclined channel 13, an upper pressing ring 4, a rubber cylinder 5, a lower pressing ring 6 and a hollow bolt 7 are sequentially embedded in the through stepped hole 131 from top to bottom, the hollow bolt 7 is in threaded connection with the wall of the through stepped hole 131, and the hollow bolt 7 can be abutted against the lower pressing ring 6.
The through stepped hole 131 extends downwards to the bottom end of the inclined channel 13, a hole shoulder at the top of the through stepped hole 131 can limit the upper pressing ring 4, and a section of internal thread is arranged at the tail end of the through stepped hole 131. Rubber cylinder 5 presss from both sides and establishes between two clamping rings, and outermost hollow bolt 7 has the interior through-hole that runs through its both ends, and the interior latus rectum of rubber cylinder 5, two clamping rings and hollow bolt 7 should match with the armor pipe external diameter of armoured cable. The front end external thread of the hollow bolt 7 can be connected with the tail end internal thread passing through the stepped hole 131, the bolt head of the hollow bolt 7 is exposed outside, and when the hollow bolt 7 rotates to just contact with the lower pressing ring 6, the thread step (specifically, the lowest end of the thread step, namely the upper end position of the bolt head) of the hollow bolt 7 has a certain distance with the step hole (namely, the lower port of the inclined channel 13) to enable the hollow bolt 7 to continue to rotate in order to compress the rubber cylinder 5 to expand radially, so that the annular space between the armor pipe and the step hole 131 is sealed.
Because the armored cable for the oil field is often strong in corrosion resistance, the sealing of a hanging part is not required to be considered, and only the annular liquid is required to be prevented from entering a tool. Through the cooperation of each clamping ring, rubber cylinder 5 and hollow bolt 7, when hollow bolt 7 inwards lasts the precession, rubber cylinder 5 radially warp under the extrusion of clamping ring 6 down, plays sealed cable armour pipe and passes through the effect of annular space between the shoulder hole 131, has effectively guaranteed the leakproofness of cable round-off end, avoids in the annular space liquid entering instrument of oil jacket. The upper portion (i.e. the portion without thread) of the stepped hole 131, and the upper press ring 4, the lower press ring 6 and the rubber cylinder 5 which are engaged with the stepped hole, are generally not in a perfect circle shape, so as to prevent the seal assembly formed by the press ring and the rubber cylinder 5 from rotating during use, which may affect the sealing effect.
Further, the piping of the lower pipe body 16 is eccentrically designed, and the piping is inclined in the middle so that the piping communicates with the lower tool through the center of the lower portion of the lower pipe body 16. For convenience of processing, the eccentric channel 12 includes an axial channel 121 and an inclined channel 122 which are communicated with each other, an axis of the axial channel 121 is parallel to a center line of the central channel 11, an axis of the inclined channel 122 and an axis of the axial channel 121 form a certain included angle, and a lower end of the inclined channel 122 is communicated to a lower end center of the lower tube 16.
The inclined channel 13 of the lower pipe body 16 adopts an inclined design, the armor layer with the thickness of several millimeters is coated on the outer portion of the cable, bending is difficult, if the bending angle is too large, the risk of cable damage is likely to occur, and the lower pipe body 16 adopting the inclined design can enable the cable to smoothly pass out of the lower pipe body 16 without other internal butt joint links. Due to the bending of the armored cable product and considering the distance of the bypass, the included angle between the axis of the oblique channel 13 and the axis of the outer tube 1 is preferably 5-10 degrees, so as to facilitate the natural passing of the cable.
Preferably, the cross section of the notch 14 in the plane where the axis of the eccentric channel 12 and the axis of the oblique channel 13 are located is trapezoidal, the lower base of the trapezoid corresponds to the opening end of the notch 14, both waists of the trapezoid are oblique sides, and one oblique side (i.e., the upper oblique side) is communicated with the lower end of the oblique channel 13 and is perpendicular to the axis of the oblique channel 13. The two inclined planes of the gap 14 corresponding to the two inclined sides of the trapezoid can facilitate the smooth entering of the cable into the oil sleeve annulus to be connected with a leading cable of the submersible electric pump. Furthermore, the included angle between the upper inclined edge of the trapezoid and the horizontal plane and the included angle between the lower inclined edge of the trapezoid and the axis of the outer pipe 1 are as small as possible, so that the cable can smoothly enter the annular space, and the cable can be prevented from being damaged due to large bending. In this embodiment, since the upper oblique edge of the trapezoid is perpendicular to the axis of the oblique channel 13, an included angle between the upper oblique edge of the trapezoid and the horizontal plane is equal to an included angle between the axis of the oblique channel 13 and the central line of the central channel 11, and is preferably 5 to 10 °. The angle between the oblique side of the trapezoid remote from the oblique channel 13, i.e. the lower oblique side, and the axis of the outer tube 1 is preferably less than or equal to 30 °.
Further, the installation method of the cable passing through the bypass short section comprises the following specific steps:
the cable is run from within the coiled tubing along the inner channel of the tool string until the cable in this embodiment passes through the bypass sub. Then, the cable firstly passes through the upper pipe body 15 and the upper garland 21, and after the cable passes through a proper distance, the upper end of the upper pipe body 15 is connected with the downhole tool string. The upper garland 21 covered with the cable is installed in the inner cavity of the upper tube body 15 and abuts against the upper limit step 151, so that the upper stepped hole 211 of the upper garland 21 faces towards the outer end (i.e. faces downwards), then the cable passes through the upper connection tube 31, and the upper garland 3112 of the upper connection tube 31 is inserted into the upper stepped hole 211 of the upper garland 21 and abuts against the top hole shoulder of the upper stepped hole 211.
After the slips 32 are sleeved into the cable, the slips 32 are pushed into the upper connecting pipe 31, then the lower connecting pipe 33 is penetrated, the external thread of the lower connecting pipe 33 is connected with the internal thread of the upper connecting pipe 31, and then the lower connecting pipe 33 is completely screwed, so that the cable is tightly gripped by the slips 32 and cannot move. Because the matching surfaces of the slips 32 and the upper connecting pipe 31 are conical surfaces, when the cable and the tool string are required to move relatively, the more tightly the slips 32 are pressed by the conical surfaces, the more tightly the cable is bitten, and the suspension and the fixation of the cable in the well are ensured. After the lower connecting tube 33 is screwed, the lower flower ring 22 is placed on the lower limiting step 161 of the lower tubular body 16, and the lower stepped hole 221 of the lower flower ring 22 faces the lower connecting tube 33.
The cable is threaded into the lower tube 16 provided with the lower garland 22 and penetrates out of the inclined channel 13 of the lower tube 16, the lower tube 16 is connected with the upper tube 15 after the upper tube 15 is sleeved with the sealing ring 17, and the thread is screwed until the bottom hole shoulder of the lower stepped hole 221 of the lower garland 22 is matched with the lower connecting tube 33. Next, the cable sequentially penetrates through the upper pressure pad, the rubber barrel 5, the lower pressure ring 6 and the hollow bolt 7, then four penetrating parts are sequentially placed into the inclined channel 13, the hollow bolt 7 is screwed in, the lower pressure ring 6 is pushed to further press the rubber barrel 5 to deform, and the annular space between the cable and the inclined channel 13 is sealed.
The slip 32, the upper connecting pipe 31 and the lower connecting pipe 33 are matched with each other to realize the fixation and suspension of the cable in the embodiment, the sealing ring 17 and the rubber cylinder 5 realize the sealing effect of the embodiment, the cable penetrates out of the inclined channel 13 and then is connected with a lead cable of the submersible electric pump from an oil sleeve annulus, and the installation of the cable in the embodiment through the bypass short section is completed.
In conclusion, the steel coiled tubing downhole cable in the embodiment passes through the bypass short section, and is suitable for operation of oil extraction or logging instruments of the coiled tubing electric submersible pump of the oil and gas well. Through the cooperation of the upper connecting pipe 31, the slips 32 and the lower connecting pipe 33 in the slip connector 3, the cable can be firmly suspended, and the overflowing diameter of the tool can be ensured by utilizing the cooperation of the central hole 23 and the oil passing hole 24 of each flower ring. By matching the eccentric channel 12 and the oblique channel 13, the lower end of the tool is conveniently connected with other tool strings, the bypass penetration of the cable is realized, and the sealing performance of the penetrating end of the cable is ensured. The whole cable passes through the bypass short section, is a bypass connector which is simple in structure, firm in sealing and capable of working under pressure and passing through the underground, can realize the function that a cable passes through the inside of a pipe and is connected with a leading cable of an electric submersible pump after passing through the bypass short section, can greatly reduce the damage of the cable in the operation process, does not need to use a cable protector, and reduces the cost of well logging, oil extraction or operation of a coiled tubing.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications of the invention without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (13)
1. A steel continuous pipe underground cable crossing bypass short section is characterized by comprising an outer pipe;
the outer tube is internally provided with a central channel positioned at the upper part of the outer tube, and an eccentric channel and an oblique channel positioned at the lower part of the outer tube, and the eccentric channel and the oblique channel are both communicated with the central channel; the central channel is communicated with the upper end of the outer tube upwards, the axis of the eccentric channel deviates from the central line of the central channel, and the lower part of the eccentric channel is communicated with the center of the lower end of the outer tube after being deflected; a notch is formed in the outer side wall of the lower part of the outer pipe, the lower end of the inclined channel is communicated with the notch, and a cable can pass through the inclined channel in a sealing manner;
an upper garland and a lower garland which are vertically spaced are arranged in the central passage, and both the upper garland and the lower garland are provided with a central hole through which the cable can pass and a plurality of oil passing holes which are arranged around the central hole; go up the wreath the floral ring with be connected with the slips connector down between the floral ring, the interior latus rectum of slips connector with the centre bore is just to setting up and can supplying the cable passes, the slips that has ability radial contraction and inner wall and have tooth in the slips connector, the slips is the shrink state setting just tooth can be gripped the cable.
2. The steel coiled tubing downhole wireline pass-through bypass sub of claim 1,
the slip connector further comprises an upper connecting pipe and a lower connecting pipe, and the upper connecting pipe and the lower connecting pipe are axially limited between the upper garland and the lower garland; the inside of the upper connecting pipe is provided with an inner conical surface with the diameter gradually expanding downwards, the outer wall of the slip is an outer conical surface matched with the inner conical surface, and the slip is arranged in the upper connecting pipe in a shrinkage state in a penetrating mode; the outer wall of the upper end of the lower connecting pipe is in threaded connection with the inner wall of the lower end of the upper connecting pipe, and the upper end of the lower connecting pipe can abut against the slip.
3. The steel coiled tubing downhole wireline pass-through bypass sub of claim 2,
the slips are conical tube bodies with longitudinal cuts, the teeth are formed on the inner walls of the conical tube bodies, and the outer conical surfaces are formed on the outer walls of the conical tube bodies; a plurality of slots are formed in the pipe wall of the conical pipe body, and the slots extend to one end of the conical pipe body.
4. The steel coiled tubing downhole wireline pass-through bypass sub of claim 3,
many the slot is including many first slots and many second slots of crisscross setting, first slot upwards extends to the upper end of toper body, the second slot extends downwards to the lower extreme of toper body.
5. The steel coiled tubing downhole wireline pass-through bypass sub of claim 2,
the upper end of the lower connecting pipe is circumferentially and fixedly connected with the lower end of the slip.
6. The steel coiled tubing downhole wireline pass-through bypass sub of claim 2,
the upper connecting pipe comprises an outer sheath and an inner taper sleeve, a stepped mounting hole with the diameter expanding downwards is formed in the outer sheath, the inner taper sleeve is inserted into the stepped mounting hole and can abut against a hole shoulder at the top of the stepped mounting hole, and the inner taper surface is formed on the inner wall of the inner taper sleeve.
7. The steel coiled tubing downhole wireline pass-through bypass sub of claim 2,
an upper stepped hole with the diameter expanded is formed downwards at the lower part of the central hole of the upper garland, an upper convex ring is formed at the upper end of the upper connecting pipe, and the upper convex ring can be inserted into the upper stepped hole and can be propped against the top hole shoulder of the upper stepped hole; the upper part of the central hole of the lower garland is upwards provided with a lower stepped hole with the diameter enlarged, the lower end of the lower connecting pipe is provided with a lower convex ring, and the lower convex ring can be inserted into the lower stepped hole and can abut against the bottom hole shoulder of the lower stepped hole.
8. The steel coiled tubing downhole wireline pass-through bypass sub of claim 1,
an upper limiting step and a lower limiting step are formed on the inner wall of the outer pipe, and the upper garland and the lower garland can respectively abut against the upper limiting step and the lower limiting step.
9. The steel coiled tubing downhole cable crossing bypass sub of claim 1,
the outer pipe comprises an upper pipe body and a lower pipe body which are connected in a sealing mode from top to bottom, one part of the central channel is formed in the upper pipe body, the other part of the central channel is formed in the upper part of the lower pipe body, and the eccentric channel and the inclined channel are formed in the lower part of the lower pipe body; the notch is formed in the outer wall of the lower pipe body, and the upper garland and the lower garland are respectively arranged in the upper pipe body and the lower pipe body.
10. The steel coiled tubing downhole wireline pass-through bypass sub of claim 1,
the lower part of the inclined channel downwards forms a through stepped hole with the diameter increased, an upper pressing ring, a rubber cylinder, a lower pressing ring and a hollow bolt are sequentially embedded in the through stepped hole from top to bottom, the hollow bolt is in threaded connection with the wall of the through stepped hole, and the hollow bolt can be abutted against the lower pressing ring.
11. The steel coiled tubing downhole cable crossing bypass sub of claim 1,
the included angle between the axial line of the oblique channel and the axial line of the outer tube is 5-10 degrees.
12. The steel coiled tubing downhole wireline pass-through bypass sub of claim 1,
the cross section of the notch in the plane where the axis of the eccentric channel and the axis of the inclined channel are located is trapezoidal, the lower bottom of the trapezoid corresponds to the opening end of the notch, two waists of the trapezoid are inclined edges, and one inclined edge is communicated with the lower end of the inclined channel and is perpendicular to the axis of the inclined channel.
13. The steel coiled tubing downhole cable crossing bypass sub of claim 12,
the included angle between the inclined edge far away from the inclined channel in the trapezoid and the axis of the outer pipe is less than or equal to 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110854973.1A CN115680545A (en) | 2021-07-28 | 2021-07-28 | Steel coiled tubing underground cable passes through bypass nipple joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110854973.1A CN115680545A (en) | 2021-07-28 | 2021-07-28 | Steel coiled tubing underground cable passes through bypass nipple joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115680545A true CN115680545A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110854973.1A Pending CN115680545A (en) | 2021-07-28 | 2021-07-28 | Steel coiled tubing underground cable passes through bypass nipple joint |
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| CN (1) | CN115680545A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116006139A (en) * | 2023-03-20 | 2023-04-25 | 西安洛科电子科技股份有限公司 | Cable intelligent dispensing system using wireless power transmission |
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