CN115749662B - Orifice device suitable for underground annular pressurizing and hole fixing of coal mine and well cementation method - Google Patents
Orifice device suitable for underground annular pressurizing and hole fixing of coal mine and well cementation method Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 claims abstract description 51
- 239000004568 cement Substances 0.000 claims description 35
- 239000012530 fluid Substances 0.000 claims description 31
- 238000005553 drilling Methods 0.000 claims description 24
- 239000002002 slurry Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
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- 238000004140 cleaning Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention provides a hole fixing method of a hole opening device suitable for underground annular pressurizing hole fixing of a coal mine, which comprises a connecting pipe, a three-way pipe, a sealing element and an elastic element, wherein the connecting pipe is inserted into the three-way pipe along the axial direction of the three-way pipe, the sealing element and the elastic element are sleeved on the connecting pipe, the sealing element is in contact connection with the end part of the three-way pipe, the elastic element is arranged on one side of the sealing element and is in contact connection with the sealing element, a rubber ring is arranged at the contact part of the sealing element and the end part of the three-way pipe to form a first sealing area, a rubber ring is arranged at the contact part of the sealing element and the connecting pipe to form a second sealing area, and the first sealing area meets the following sealing conditions: [ P pi (R 2-r2)+∫spcosθds+F]μ>pD1, second seal region under seal conditions of (P ext+∫spcosθds)μ>pD2).
Description
Technical Field
The invention belongs to the field of coal mine safety, and particularly relates to an orifice device and a well cementation method suitable for underground annular pressurization and hole fixation of a coal mine.
Background
Drilling is indispensable in the coal mine production process. The drilling application fields are various, such as gas extraction drilling, water drainage drilling, communication drilling and the like. In some drilling applications, casing and hole fixing are required to be performed on the drilling hole, namely, cement is used for filling the annulus between the drilling hole and the casing, so as to achieve the purpose of reinforcing the drilling hole. However, in some fractured rock formations, simple annulus cementing also does not ensure the stability of the borehole, and thus annulus pressurized cementing is required. The annular pressurizing well cementation means that cement slurry is injected into an annular space formed by a drilling hole and a casing pipe, and then the cement slurry is solidified under a certain bearing pressure, so that the tight combination of the cement and the drilling hole can be ensured.
At present, the downhole drilling and hole fixing method is that after drilling is completed, a sleeve or orifice pipe is put into the hole to form a drilling-sleeve annular space (hereinafter referred to as an annular space), an annular space (shown in fig. 9) is filled with materials such as polyurethane as far as possible from an annular opening (near one end of a roadway), and then a reserved beam pipe is used for grouting the annular space, so that an annular space gap is blocked. The method has the advantages of mature technology, simple and convenient operation, no need of additional device assistance and suitability for section drilling or orifice pipe fixing. The method has the defects that the hole fixing quality cannot be ensured, certain gaps exist in the annular cement, air bags, water bags and the like are formed, the well cementation quality is affected, and the method is not suitable for annular pressurization hole fixing and long drilling hole fixing.
In the underground long-drilling pressurizing and fixing hole, namely, an annular outlet is sealed, cement slurry which is equivalent to the annular volume is injected into an oil pipe, and then the cement slurry in the oil pipe is injected into clear water and is sent into the annular space through the oil pipe, as shown in figure 10, the annular pressurizing and fixing hole is provided with a tee joint at the outer end of an orifice pipe, and the annular space is sealed by trying to seal the annular space, but the annular seal used for sealing the annular space is mostly provided with a sealing rubber core, and the sealing principle is that the rubber core is deformed after being extruded, so that the annular space is sealed. However, for annular pressurized hole-fixing operation, the conventional rubber core sealing cannot meet the requirement. The reason is mainly that the smoothness of the outer wall of the sleeve and the inner wall of the orifice tube cannot be ensured. The rubber core seal has higher requirements on the smoothness of the sealing end surface, and the geological sleeve production process for the coal mine has no requirements on the smoothness; meanwhile, the dust environment of the coal mine is difficult to ensure the cleanness and smoothness of the sealing end face, the outer wall of the common geological sleeve is rough and is in the dust environment, and the sealing reliability of the rubber core is difficult to ensure by using the rubber core for sealing.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an orifice device and a well cementation method suitable for underground annular pressurization and hole fixation of a coal mine, which solve the problems of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
An orifice device suitable for pressurized and fixed-hole of an annulus in a coal mine, comprising: the connecting pipe is inserted in the three-way pipe along the axial direction of the three-way pipe, the sealing piece and the elastic piece are sleeved on the connecting pipe, the sealing piece is in contact connection with the end part of the three-way pipe, the elastic piece is arranged on one side of the sealing piece and is in contact connection with the sealing piece, a rubber ring is arranged at the contact part of the sealing piece and the end part of the three-way pipe to form a first sealing area, a rubber ring is arranged at the contact part of the sealing piece and the connecting pipe to form a second sealing area,
The first sealing region satisfies the following sealing conditions:
[pπ(R2-r2)+∫spcosθds+F]μ>pD1 (1)
the second sealing area is under the following sealing conditions:
(Pext+∫spcosθds)μ>pD2 (2)
Wherein D 1 is the width of a high-pressure fluid channel which needs to be sealed in a first sealing area, D 2 is the width of a high-pressure fluid channel in a second sealing area, mu is the static friction coefficient, P is the high-pressure fluid pressure which needs to be sealed, P ext is the radial extrusion force formed by the sealing surface of the rubber ring and the fluid flowing direction, theta is the included angle formed by the sealing surface of the rubber ring and the fluid flowing direction, F is the elastic force provided by the elastic piece, S is the sealing curved surface provided by the rubber ring, R is the radius of a sealing inner ring of the sealing element acted by the high-pressure fluid, and R is the radius of a sealing outer ring of the sealing element acted by the high-pressure fluid.
Preferably, the connecting pipe is provided with a first through hole along the axial direction, the two ends of the three-way pipe along the axial direction are respectively provided with a second through hole and a third through hole, the side wall of the three-way pipe is provided with a fourth through hole, the connecting pipe is arranged in the three-way pipe along the second through hole and the third through hole, the periphery of the connecting pipe along the axial direction is provided with an annular groove, the sealing element and the elastic element are sleeved on the annular groove, the two ends of the connecting pipe are respectively provided with a first connecting element and a second connecting element, the first connecting element is positioned outside the three-way pipe, and the second connecting element is positioned inside the three-way pipe.
Preferably, a third connecting piece is sleeved on the three-way pipe, and the third connecting piece is positioned at one side close to the third through hole.
Preferably, the rubber ring adopted at the first sealing area is a Y-shaped sealing ring, and the rubber ring adopted at the second sealing area is an O-shaped sealing ring.
Preferably, the first connecting piece and the third connecting piece are flanges, and the second connecting piece is a screw thread.
The hole fixing method suitable for the underground coal mine annulus pressurization hole fixing adopts the orifice device suitable for the underground coal mine annulus pressurization hole fixing, and the method comprises the following steps:
Firstly, drilling, namely fixing a hole after entering an orifice pipe;
Step two, a sleeve is put down along the orifice pipe, a second connecting piece of the connecting pipe is connected with the sleeve, a tee pipe is sleeved on the connecting pipe, a sealing piece is connected with one end of the tee pipe in a sealing way through a rubber ring, and a third connecting piece of the tee pipe is connected with the orifice pipe;
Step three, injecting clear water into the connecting pipe through the first through hole until the clear water returns out from the fourth through hole of the three-way pipe;
Step four, connecting a ball valve on a first connecting piece of the connecting pipe, connecting a slurry pump with the ball valve, arranging an overflow valve at a fourth hole of the three-way pipe, adjusting the pressure of the overflow valve to be the target pressure of annular cement slurry, opening the ball valve, and injecting cement slurry into the sleeve; and after the cement slurry is injected, closing the ball valve to perform setting, and completing hole fixing.
Preferably, the sealing element is preset on the connecting pipe, and the rubber ring of the second sealing area is preset between the connecting pipe and the sealing element according to the requirement.
Preferably, the casing string is needed to be used for the casing in the second step, the casing string comprises a guide shoe, a cyclone and a floating hoop, the support ring and the casing special for the coal mine can enable the casing string to be placed into the drill hole by the guide shoe, the cyclone can enable cement paste to form turbulent flow, and the floating hoop can prevent cement paste from flowing back.
Preferably, the setting adopts the mode that a rubber plug is put into a pipeline at the front end of the ball valve, the ball valve is reconnected with a pipeline of the slurry pump, clear water is injected into the sleeve, and the rubber plug is pushed to advance until the supporting ring is set.
Preferably, the hole fixing method suitable for the underground coal mine annulus pressurization hole fixing further comprises the following steps:
And fifthly, after the cement paste is initially set, removing the three-way pipe, removing the connecting pipe, sealing the orifice by using the flange plate, and cleaning the three-way pipe and the connecting pipe for the next use.
Compared with the prior art, the invention has the following technical effects:
In the orifice device, a sealing element and an elastic element are arranged on a connecting pipe, a rubber ring is arranged between the sealing element and the connecting pipe to form a first sealing area, a rubber ring is arranged between the sealing element and a three-way pipe to form a second sealing area, and sealing connection between the connecting pipe and the three-way pipe is realized; after the combination of the elastic piece and the sealing piece is changed, the pressure applied to the Y-shaped ring of the first sealing area is as follows: p pi (R 2-r2)+∫S pcos θds+F), wherein p pi (R 2-r2) is the pressure provided by the cementing fluid acting on the sealing member, p is the cementing hydraulic pressure, obviously, the larger the cementing hydraulic pressure p is, the larger the p pi (R 2-r2) is, namely, the sealing effect is improved by the pressure of the cementing fluid, F is the pressure provided by the elastic member, obviously, F is related to the performance of the elastic member, the proper F can be provided by using the corresponding spring according to the cementing hydraulic pressure grade design, for the second sealing area, the force of the cementing fluid acting on the rubber ring branch of the second sealing area is as large as S pcos theta ds, obviously, the force is also in direct proportion to the cementing fluid pressure p, the sealing effect is improved by the aid of the pressure of the cementing fluid, and the sealing effect of the embodiment is achieved under the combined action of the first sealing area and the second sealing area.
(II) the hole fixing method of the invention, the cement paste is injected from the sleeve, and flows back to the annulus through the end of the sleeve until the annulus is full of cement paste, compared with the conventional method of injecting cement from the orifice annulus, the hole fixing method of the invention can be suitable for long drilling and upward hole fixing; the cement paste in the casing is replaced by clean water, the annulus is filled with cement after the hole fixing is completed, and the casing is filled with clean water, so that the follow-up work is not influenced; compared with the traditional hole fixing method, the method can realize pressurizing and solidifying the annular space after the annular space is filled with cement paste, thereby improving the hole fixing quality; the cement paste injected into the annular space flows in a turbulent flow manner, so that the annular space is prevented from forming a gas pocket and a water pocket, and the quality of a fixed hole is prevented from being influenced; after the annular cement is initially set, the orifice device can be dismantled, and the cement is washed away for reuse.
Drawings
FIG. 1 is a schematic view of the orifice device of the present invention;
FIG. 2 is a schematic structural view of a connecting tube according to the present invention;
FIG. 3 is a schematic view of the tee of the present invention;
FIG. 4 is a schematic illustration of the construction of an application of the casing string of the present invention;
FIG. 5 is a force analysis diagram of a first sealing area of the present invention;
FIG. 6 is a force analysis chart of a second sealing area of the present invention;
FIG. 7 is a schematic view of the structure of the first sealing region of the present invention;
FIG. 8 is a schematic view of the structure of a second sealing region of the present invention;
FIG. 9 is a schematic view of a prior art borehole fastening structure of the present invention;
fig. 10 is a schematic view of a long-drilled pressurized fastening hole according to the prior art of the present invention.
The meaning of each reference numeral in the figures is:
1, connecting pipes; 2, a three-way pipe; 101, a first through hole; 201, a second through hole; 202, a third through hole; 2-2, a fourth through hole; 2-3, a third connector; 1-2, a first connector; 1-3, sealing member; 1-4, an elastic member; 1-5, a Y-shaped sealing ring; 1-6,O type sealing rings; 1-7, a second connector; 1-8, ring grooves; 4, orifice tube; 5, a ball valve; 5-1, a ball valve flange; 4-1, orifice pipe flanges; 3-1, a sleeve special for a coal mine; 3-2, supporting rings; 3-3, a rubber plug; 3-4, floating hoops; 3-5, a cyclone; 3-6, guiding shoes; 5, drilling a hole; and 6, drilling holes at two sides.
The following examples illustrate the invention in further detail.
Detailed Description
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
Directional terms referred to herein, such as "radial", "axial", "length", "front end" and "rear end", are consistent with a particular direction on the page in the drawings of the specification or a corresponding direction of the space shown in the drawings.
The front end and the rear end are referred to by the flow direction of the liquid, the inflow is the front end, and the outflow is the rear end.
Example 1:
1-8, the orifice device suitable for the underground annular pressurizing and hole fixing of the coal mine comprises a connecting pipe 1, a three-way pipe 2, a sealing element 1-3 and an elastic element 1-4, wherein the connecting pipe 1 is inserted into the three-way pipe 2 along the axial direction of the three-way pipe 2, the sealing element 1-3 and the elastic element 1-4 are sleeved on the connecting pipe 1, the sealing element 1-3 is in contact connection with the end part of the three-way pipe 2, the elastic element 1-4 is arranged on one side of the sealing element 1-3 and is in contact connection with the sealing element 1-3, a rubber ring is arranged at the contact part of the sealing element 1-3 and the end part of the three-way pipe 2 to form a first sealing area, a rubber ring is arranged at the contact part of the sealing element and the connecting pipe to form a second sealing area,
The first sealing region satisfies the following sealing conditions:
[pπ(R2-r2)+∫spcosθds+F]μ>pD1 (1)
the second sealing area is under the following sealing conditions:
(Pext+∫spcosθds)μ>pD2 (2)
Wherein D 1 is the width of a high-pressure fluid channel which needs to be sealed in a first sealing area, D 2 is the width of a high-pressure fluid channel in a second sealing area, mu is the static friction coefficient, P is the high-pressure fluid pressure which needs to be sealed, P ext is the radial extrusion force formed by the sealing surface of the rubber ring and the fluid flowing direction, theta is the included angle formed by the sealing surface of the rubber ring and the fluid flowing direction, F is the elastic force provided by the elastic piece, S is the sealing curved surface provided by the rubber ring, R is the radius of a sealing inner ring of the sealing element acted by the high-pressure fluid, and R is the radius of a sealing outer ring of the sealing element acted by the high-pressure fluid.
In the orifice device of this embodiment, a sealing element and an elastic element are disposed on a connecting pipe, a rubber ring is disposed between the sealing element and the connecting pipe to form a first sealing area, and a rubber ring is disposed between the sealing element and a three-way pipe to form a second sealing area, so as to realize sealing connection between the connecting pipe and the three-way pipe, in this embodiment, when the rubber ring is used in the first sealing area, the extrusion force applied to the rubber ring is P ext, and the friction force that the rubber ring can provide is μp ext; after the combination of the elastic piece and the sealing piece is changed, the pressure applied to the Y-shaped ring of the first sealing area is as follows: p pi (R 2-r2)+∫S pcos θds+F), wherein p pi (R 2-r2) is the pressure provided by the cementing fluid acting on the sealing member, p is the cementing hydraulic pressure, obviously, the larger the cementing hydraulic pressure p is, the larger the p pi (R 2-r2) is, namely, the sealing effect is improved by the pressure of the cementing fluid, F is the pressure provided by the elastic member, obviously, F is related to the performance of the elastic member, the proper F can be provided by using the corresponding spring according to the cementing hydraulic pressure grade design, for the second sealing area, the force of the cementing fluid acting on the rubber ring branch of the second sealing area is as large as S pcos theta ds, obviously, the force is also in direct proportion to the cementing fluid pressure p, the sealing effect is improved by the aid of the pressure of the cementing fluid, and the sealing effect of the embodiment is achieved under the combined action of the first sealing area and the second sealing area.
As a preferred scheme of the embodiment, the connecting pipe 1 is internally provided with a first through hole 101 along the axial direction thereof, two ends of the three-way pipe 2 along the axial direction thereof are respectively provided with a second through hole 201 and a third through hole 202, the side wall of the three-way pipe 2 is provided with a fourth through hole 2-2, the connecting pipe 1 is arranged in the three-way pipe 2 along the second through hole 201 and the third through hole 202, the periphery of the connecting pipe 1 along the axial direction thereof is provided with an annular groove, the sealing element 1-3 and the elastic element 1-4 are respectively sleeved on the annular groove, two ends of the connecting pipe 1 are respectively provided with a first connecting piece 1-2 and a second connecting piece 1-7, the first connecting piece 1-2 is positioned outside the three-way pipe 2, and the second connecting piece 1-7 is positioned inside the three-way pipe 2.
The first connecting piece 1-2 of the connecting pipe 1 is convenient to connect with a grouting pump, the annular groove 1-8 is used for installing the sealing piece 1-3 and the elastic piece 1-4, the second connecting piece 1-7 is used for connecting the sleeve 3-1, the sealing piece is an annular disc, the Y-shaped sealing ring 1-5 and the O-shaped sealing ring 1-6,O are installed on the sealing piece 1-3 and are installed on the inner side of the sealing piece, and the sliding sealing effect is achieved with the connecting pipe; the Y-shaped sealing rings 1-5 are arranged on the surface of the sealing piece and are matched with the three-way pipe 2 to play a role of fixing and sealing, and the number of the Y-shaped sealing rings 1-5 and the number of the O-shaped sealing rings 1-6 are not fixed, and can be 1, 2 or 3 or more. The back part of the sealing element in the ring groove is provided with an elastic element 1-4, which has the function of enabling the sealing element 1-3 to move in a small range to adjust the relative position of the connecting pipe 1 and the three-way pipe 2, and the elastic element 1-4 in the embodiment is a spring.
As a preferred solution of this embodiment, the third connecting piece 2-3 is sleeved on the tee 2, and the third connecting piece 2-3 is located at a side close to the third through hole 202.
Wherein, the three-way pipe 2 is matched with the connecting pipe 1, the second through hole is matched with the connecting pipe 1, and the inner wall of the front end is tightly pressed with the sealing disc 1-3 of the connecting pipe 1 to play a sealing role; the third connecting piece 2-3 is welded at the rear end of the tee joint and is connected with the orifice pipe flange 4-1, and the sealing piece 1-3 can adjust the position in a small range in the connecting process, so that the normal connection of the tee joint pipe 2 and the orifice pipe 4 can be ensured.
As a preferable scheme of the embodiment, the rubber ring adopted by the first sealing area is a Y-shaped sealing ring 1-5, and the rubber ring adopted by the second sealing area is an O-shaped sealing ring 1-6.
The second sealing region is effective in sealing only when D 2 is small enough and P ext is large enough relative to the first sealing region, and the requirements for P ext and D 2 are high, whereas P ext depends on the extrusion force provided during processing and manufacturing, and is independent of the rubber ring structure. Therefore, in sealing the second sealing area, an O-ring with a smaller sealing end surface needs to be selected as far as possible to reduce D 2, and the O-ring is better in this embodiment, while the first sealing area provides an additional pressing force in addition to P ext, F, P, so that the requirement on D 1 is lower, and therefore, the sealing can be performed by using a Y-ring with a better sealing effect, a longer service life, and a larger sealing end surface.
As a preferable scheme of the present embodiment, the first connecting piece 1-2 and the third connecting piece 2-3 are flanges, and the second connecting piece 1-7 is a screw thread.
Example 2:
the invention relates to a hole fixing method suitable for underground annular pressurizing hole fixing of a coal mine, which comprises the following steps: as shown in figure 4 of the drawings,
① A drilling hole 5 is formed, the hole is drilled into the orifice pipe 4, and the hole is fixed by adopting the conventional method;
② And (6) drilling holes at two sides, and putting a casing string into the casing string, wherein the casing string structure is as follows: the guide shoes 3-6, the cyclone 3-5, the floating hoop 3-4, the supporting ring 3-2 and the special sleeve 3-1 for coal mines, wherein the guide shoes 3-6 are used for facilitating the sleeve string 3 to be put into the drill hole 6, the cyclone 3-5 is used for enabling cement paste to form turbulence, the floating hoop 3-4 is essentially a one-way valve for preventing the cement paste from flowing back, the supporting ring 3-2 is used for sealing the sleeve string at the position by matching with the base of the rubber plug 3-3 which is put into the later step;
③ And installing the connecting pipe 1, and connecting the second connecting piece 1-7 at the rear end of the connecting pipe 1 with the sleeve 3 in a threaded manner.
④ And (3) installing the three-way pipe 2, and pressing the second through hole end at the front end of the three-way pipe 2 on the sealing element 1-3 of the connecting pipe 1 to drag the second through hole end to the rear end until the third connecting element 2-3 is tightly connected with the orifice pipe flange 4-1.
⑤ Injecting clear water into the special sleeve 3-1 for the coal mine through the connecting pipe 1 until the clear water returns out of the fourth through hole 2-2, and rapidly circulating to clean the hole wall;
⑥ After cleaning, connecting a ball valve 5 with a first connecting piece 1-2 of a connecting pipe 1, connecting a slurry pump with a ball valve flange 5-1, connecting an overflow valve with a fourth through hole 2-2 of a three-way pipe 2, and adjusting the pressure of the overflow valve, wherein the pressure of the overflow valve is the target pressure of annular cement slurry; calculating the volume of cement paste required by the fixed hole, opening the ball valve 5, and injecting cement into the sleeve; after the injection of the required cement is completed, closing the ball valve 5, disassembling a pipeline at the front end of the ball valve 5, putting a rubber plug 3-3 in the pipeline at the front end of the ball valve, reconnecting the pipeline, injecting clear water into the special sleeve 3-1 for the coal mine by the connecting pipe 1, pushing the rubber plug 3-3 to advance until the supporting ring 3-2 is seated, and finishing the fixing hole at the moment;
⑦ After cement is initially set, the three-way pipe 2 is removed, the connecting pipe 1 is removed, and then the orifice is plugged by a flange plate (namely a circular steel plate with a matching interface with the orifice pipe flange 4-1); the tee 2 and the connecting pipe 1 are cleaned and prepared for the next use.
Claims (10)
1. An orifice device suitable for colliery is annular space pressurization fixed orifices in pit, characterized in that includes:
The connecting pipe (1), the three-way pipe (2), the sealing element (1-3) and the elastic element (1-4), wherein the connecting pipe (1) is inserted into the three-way pipe (2) along the axial direction of the three-way pipe (2), the sealing element (1-3) and the elastic element (1-4) are sleeved on the connecting pipe (1), the sealing element (1-3) is in contact connection with the end part of the three-way pipe (2), the elastic element (1-4) is arranged on one side of the sealing element (1-3) and is in contact connection with the sealing element (1-3), a rubber ring is arranged at the contact part of the sealing element (1-3) and the end part of the three-way pipe (2) to form a first sealing area, a rubber ring is arranged at the contact part of the sealing element and the connecting pipe to form a second sealing area,
The first sealing region satisfies the following sealing conditions:
[pπ(R2-r2)+∫spcosθds+F]μ>pD1 (1)
the second sealing area is under the following sealing conditions:
(Pext+∫spcosθds)μ>pD2 (2)
Wherein D 1 is the width of a high-pressure fluid channel which needs to be sealed in a first sealing area, D 2 is the width of a high-pressure fluid channel in a second sealing area, mu is the static friction coefficient, P is the high-pressure fluid pressure which needs to be sealed, P ext is the radial extrusion force formed by the sealing surface of the rubber ring and the fluid flowing direction, theta is the included angle formed by the sealing surface of the rubber ring and the fluid flowing direction, F is the elastic force provided by the elastic piece, S is the sealing curved surface provided by the rubber ring, R is the radius of a sealing inner ring of the sealing element acted by the high-pressure fluid, and R is the radius of a sealing outer ring of the sealing element acted by the high-pressure fluid.
2. The orifice device suitable for underground annular pressurizing and hole fixing of coal mine according to claim 1, wherein the connecting pipe (1) is internally provided with a first through hole (101) along the axial direction, two ends of the three-way pipe (2) along the axial direction are respectively provided with a second through hole (201) and a third through hole (202), the side wall of the three-way pipe (2) is provided with a fourth through hole (2-2), the connecting pipe (1) is arranged in the three-way pipe (2) along the second through hole (201) and the third through hole (202), the connecting pipe (1) is provided with annular grooves (1-8) along the axial periphery, the sealing parts (1-3) and the elastic parts (1-4) are sleeved on the annular grooves, two ends of the connecting pipe (1) are respectively provided with a first connecting part (1-2) and a second connecting part (1-7), the first connecting part (1-2) is positioned outside the three-way pipe (2), and the second connecting part (1-7) is positioned inside the three-way pipe (2).
3. An orifice device suitable for underground annulus pressurization and hole fixation of coal mine as claimed in claim 2, wherein a third connecting piece (2-3) is sleeved on the tee pipe (2), and the third connecting piece (2-3) is positioned at one side close to the third through hole (202).
4. An orifice device suitable for underground annulus pressurization and hole fixation in coal mines as claimed in claim 1, wherein the rubber ring adopted by the first sealing area is a Y-shaped sealing ring (1-5), and the rubber ring adopted by the second sealing area is an O-shaped sealing ring (1-6).
5. A port device for pressurized fastening of an annulus in a coal mine well as claimed in claim 3, characterized in that the first (1-2) and third (2-3) connectors are flanges and the second (1-7) connectors are screw threads.
6. A hole fixing method suitable for underground coal mine annulus pressurization hole fixing, which adopts the hole opening device suitable for underground coal mine annulus pressurization hole fixing according to claim 5, and is characterized in that the method comprises the following steps:
Firstly, drilling, and fixing holes after entering an orifice pipe (4) in a drilling mode;
Step two, a sleeve (3) is put down along the orifice pipe (4), a second connecting piece (1-7) of the connecting pipe (1) is connected with the sleeve (3), a three-way pipe (2) is sleeved on the connecting pipe (1), one end of the sealing piece (1-3) is connected with one end of the three-way pipe (2) in a sealing way through a rubber ring, and a third connecting piece (2-3) of the three-way pipe (2) is connected with the orifice pipe (4);
Step three, injecting clear water into the connecting pipe (1) through the first through hole (101) until the clear water returns out from the fourth through hole (2-2) of the three-way pipe (2);
Connecting a ball valve (5) on a first connecting piece (1-2) of the connecting pipe (1), connecting a slurry pump with the ball valve (5), arranging an overflow valve at a fourth through hole (2-2) of the three-way pipe (2), adjusting the pressure of the overflow valve to be the target pressure of annular cement slurry, opening the ball valve (5), and injecting cement slurry into the sleeve (3); and after the cement slurry is injected, closing the ball valve (5) to perform setting, and finishing the hole fixing.
7. The hole fixing method for the underground coal mine annulus pressurization hole fixing according to claim 6, wherein the sealing element is preset on the connecting pipe (1), and the rubber ring of the second sealing area is preset between the connecting pipe (1) and the sealing element according to the requirement of the formula (2).
8. The hole fixing method for the underground annulus pressurizing hole fixing of the coal mine according to claim 7, wherein in the second step, a sleeve string is needed to be used for the sleeve to be put in, the sleeve string comprises a guide shoe (3-6), a cyclone (3-5) and a float collar (3-4), the support ring (3-2) and the special sleeve (3-1) of the coal mine are used, the guide shoe (3-6) can be used for enabling the sleeve string to be put in a drill hole, the cyclone can enable cement paste to form turbulence, and the float collar can prevent cement paste from flowing backwards.
9. The hole fixing method suitable for the underground annular pressurizing hole fixing of the coal mine as claimed in claim 8, wherein the setting is to put a rubber plug into a pipeline at the front end of the ball valve, reconnect the ball valve with a slurry pump pipeline, inject clear water into the sleeve (3) and push the rubber plug (3-3) to advance until the supporting ring (3-2) is set.
10. The method for fastening holes for pressurizing and fastening holes in an annulus in a coal mine as claimed in claim 6, wherein said method for fastening holes for pressurizing and fastening holes in an annulus in a coal mine further comprises:
And fifthly, after the cement paste is initially set, removing the three-way pipe, removing the connecting pipe, sealing the orifice by using the flange plate, and cleaning the three-way pipe and the connecting pipe for the next use.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975041A (en) * | 2010-10-13 | 2011-02-16 | 中国石油集团钻井工程技术研究院 | Well cementing method around coal bed and device thereof |
| CN114753796A (en) * | 2022-04-18 | 2022-07-15 | 中煤科工生态环境科技有限公司 | Ground drilling device and anti-suction drilling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3948322A (en) * | 1975-04-23 | 1976-04-06 | Halliburton Company | Multiple stage cementing tool with inflation packer and methods of use |
| GB0303422D0 (en) * | 2003-02-13 | 2003-03-19 | Read Well Services Ltd | Apparatus and method |
| GB2577566B (en) * | 2018-09-28 | 2023-04-19 | Plexus Holdings Plc | Improved seal for a well |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975041A (en) * | 2010-10-13 | 2011-02-16 | 中国石油集团钻井工程技术研究院 | Well cementing method around coal bed and device thereof |
| CN114753796A (en) * | 2022-04-18 | 2022-07-15 | 中煤科工生态环境科技有限公司 | Ground drilling device and anti-suction drilling method |
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