CN106968599A - A kind of continuous pipe window opening tool - Google Patents

Abstract

The invention discloses a coiled tubing window opening tool, relates to the technical field of oil and gas drilling, and is designed for preventing a milling shoe from cutting a skewer. The coiled tubing window opening tool includes a skewer and a drilling tool assembly, the drilling tool assembly includes a power drill and a milling shoe, one end of the power drill is connected to the milling shoe, and the power drill is fixed with an eccentric structure, The eccentric mechanism is slidable along the ramping surface of the tilter. When the milling shoe cuts the side of the casing, the power drilling tool slides along the ramping surface of the skewer, so that the movement track of the milling shoe is parallel to the ramping plane, and there is always a certain distance between the milling shoe and the ramping plane to prevent the milling shoe from cutting the ramp Direction device can reduce the wear of milling shoes, thereby avoiding the waste of parts and reducing the cost of casing window opening.

Description

A coiled tubing window opening tool

technical field

The invention relates to the technical field of oil and gas drilling, in particular to a coiled tubing window opening tool.

Background technique

After years of field application and gradual development, the casing window sidetracking technology has formed the forging-milling type and the skewer type casing window sidetracking technology, which improves the utilization rate and development effect of old wells, and saves drilling costs and The cost of building wells on the ground is low, and the economic benefits are remarkable. Using coiled tubing and supporting tools to complete the sidetracking operation is a new window-opening process, which has the characteristics of fast tripping speed and high economic benefits. The use of coiled tubing sidetracking tools saves a lot of construction time for connecting single roots, and is an important way to realize the utilization of old wells, save construction period, and reduce operating costs, and has broad market prospects.

At present, the application of coiled tubing for casing window sidetracking faces problems such as coiled tubing not being able to withstand torque, low power drilling tool energy, and severe wear of the skewer. The conventional casing sidetracking process generally uses rotary table drilling rigs, top drive drilling rigs or workover rig bits. During the process of sidetracking and opening windows, the reactive torque of the power drilling tool is transmitted from the drill pipe to the coiled tubing. Thin, unable to withstand torque and pressure, prone to coiled tubing damage; the power of the power drill determines the energy of the milling shoe milling casing, in order to improve the efficiency of milling casing, the milling tool used in sidetracking operations Shoes generally have a strong cutting ability. During the sidetracking of the casing window, the casing and the inclined device are cut by the milling shoe at the same time. Due to the high hardness of the inclined device, the wear of the milling shoe is serious, which affects the The mechanical properties of the milling shoe are deteriorated, resulting in hydraulic energy loss and excessive wear of the milling shoe; after the sidetracking process is completed, the tilter cannot be used again due to severe wear, resulting in waste of the tilter and increasing the cost of the sidetracking process.

Contents of the invention

The purpose of the present invention is to propose a coiled tubing window opening tool that can avoid cutting the skewer and reduce the wear of milling shoes.

For reaching this purpose, the present invention adopts following technical scheme:

A coiled tubing window tool, comprising a skewer and a drilling tool assembly, the drilling tool assembly includes a power drill and a milling shoe, one end of the power drill is connected to the milling shoe, and the power drill is fixed with An eccentric structure, the eccentric mechanism can slide along the ramping surface of the tilter.

Wherein, the power drilling tool and the milling shoe are connected by a flexible short joint.

Wherein, the eccentric structure is provided with a slider protruding toward the ramping surface, and the ramping surface is provided with a chute extending along the length direction of the ramping surface, and the slider can slide along the chute.

Wherein, the eccentric structure is a sleeve set outside the power drilling tool, the sleeve and the power drilling tool are fixed by screws, the head of the screw forms the slider, and the head of the screw The head slides along the chute.

Wherein, it also includes a torsion-bearing mechanism, the torsion-bearing mechanism includes a torsion-bearing nipple and a torsion-bearing sleeve, the torsion-bearing nipple is connected with the power drilling tool, and the torsion-bearing sleeve is sleeved on the bearing The torsion short joint is fixed with the skewer, and the torsion short joint is slidably connected with the torsion sleeve.

Wherein, the side wall of the torsion sleeve is provided with a keyway extending along the axial direction of the torsion sleeve and a helical chute, the keyway is connected with the helical chute, and the torsion joint A flat key is arranged on the top, and the flat key slides into the key groove along the spiral chute.

Wherein, the torsion-bearing mechanism further includes a torsion-proof nipple and an oil pipe connected to each other, the torsion-proof nipple is connected to the feeding mechanism, and the oil pipe is connected to the torsion-bearing nipple.

Wherein, the feeding mechanism includes a coiled tubing and a downhole tractor, the coiled tubing and the downhole tractor are connected through a coiled tubing joint, and the downhole tractor is connected with the anti-twist nipple through a safety joint.

Wherein, the skewer and the torsion sleeve are fixed by screws or welding.

Wherein, the bottom end of the skewer is connected with an anchor short joint.

Beneficial effects: the present invention provides a coiled tubing window opening tool, which includes a skewer and a drill assembly, the drill assembly includes a power drill and a milling shoe, one end of the power drill is connected to the milling shoe, The power drilling tool is fixed with an eccentric structure, and the eccentric mechanism can slide along the ramping surface of the skewer. When the milling shoe cuts the side of the casing, the power drilling tool slides along the ramping surface of the skewer, so that the movement track of the milling shoe is parallel to the ramping plane, and there is always a certain distance between the milling shoe and the ramping plane to prevent the milling shoe from cutting the ramp Direction device can reduce the wear of milling shoes, thereby avoiding the waste of parts and reducing the cost of casing window opening.

Description of drawings

Fig. 1 is the structural representation of coiled tubing window tool provided by the present invention;

Fig. 2 is a schematic structural view of the coiled tubing window opening tool provided by the present invention being lowered into the casing;

Fig. 3 is a partial enlarged view of place B in Fig. 2;

Fig. 4 is the structural representation of the skewer provided by the present invention;

Fig. 5 is a sectional view along A-A in Fig. 4 .

in:

1. Inclined device; 11. Inclined surface; 12. Chute;

21. Power drilling tool; 22. Milling shoe; 23. Eccentric structure; 231. Slider; 24. Flexible short joint;

31. Torsion-bearing sleeve; 32. Torsion-bearing nipple; 33. Anti-torsion nipple; 34. Oil pipe;

41. Coiled tubing; 42. Downhole tractor; 43. Coiled tubing joint; 44. Safety joint;

5. Casing; 6. Anchor sub.

detailed description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

The present invention provides a coiled tubing window opening tool, comprising a skewer 1 and a drilling tool assembly, the drilling tool assembly includes a power drilling tool 21 and a milling shoe 22, one end of the power drilling tool 21 is connected to the milling shoe 22, and the power drilling tool 21 An eccentric structure 23 is fixed, and the eccentric mechanism 23 can slide along the ramping surface 11 of the tilter 1 . When the milling shoe 22 cuts the side of the casing 5, the power drill 21 slides along the ramp 11 of the skewer 1, so that the movement track of the milling shoe 22 is parallel to the ramp 11, and the distance between the milling shoe 22 and the ramp 11 is always There is a certain distance to prevent the milling shoe 22 from cutting the oblique device 1, reduce the wear of the milling shoe 22, thereby avoiding the waste of parts and reducing the cost of opening the casing 5.

The coiled tubing fenestration tool provided by the present invention includes a feeding mechanism, a torsion mechanism, a drilling tool assembly and an anchoring mechanism composed of a skewer 1 and an anchoring nipple 6 . Before the sidetracking of the casing 5 and opening the window, the anchor mechanism is lowered into the window opening point of the wellbore and then fixed, so as to facilitate the positioning of the drilling tool assembly. After the positioning of the anchoring mechanism is completed, the torsion mechanism and the drilling tool assembly are connected in sequence, and the feeding mechanism smoothly lowers the torsion mechanism and the drilling tool assembly into the wellbore through the wellhead. When the drilling tool assembly is close to the window opening position, the running The speed should be less than 0.5m/s to ensure that the torsion components and drilling tools are always in the correct installation position and running track.

Specifically, the drilling tool assembly includes a power drilling tool 21 and a milling shoe 22. The milling shoe 22 is installed on the lower end of the power drilling tool 21. The milling shoe 22 is a supporting tool for the milling tool for cutting the casing 5 to complete the casing. 5 side windows. The power drilling tool 21 and the milling shoe 22 can be connected through a flexible short joint 24, which is a rotatable flexible joint 24, and the flexible joint 24 can adjust the mechanical properties of the drilling tool assembly. By adjusting the resistance of the flexible joint 24 The bending stiffness can change the turning angle and lateral force of the milling shoe 22 when opening the window, so as to better cut the sleeve pipe 5 according to the required angle and strength.

The eccentric structure 23 provided on the power drilling tool 21 can be a sleeve set outside the power drilling tool 21, and the sleeve is fixed to the power drilling tool 21 to prevent the sleeve from rotating in the circumferential direction of the power drilling tool 21 or sliding in the axial direction. The sliding of the eccentric mechanism 23 along the ramping surface 11 of the skewer 1 can be realized by the sliding groove 12 and the sliding block 231 cooperating with each other. The eccentric structure 23 can be provided with a slider 231 protruding toward the direction of the building surface, and the slope building surface 11 of the inclined device 1 can be provided with a chute 12 that cooperates with the slide block 231, and the chute 12 extends along the length direction of the building surface 11 . When working, the slider 231 of the eccentric structure 23 moves along the chute 12, driving the power drilling tool 21 to move down along the ramping surface 11. Since the ramping surface 11 is a surface with a certain slope relative to the axial direction of the casing 5, It may be that the milling shoe 22 cuts the side wall of the casing 5 at a certain angle to complete the side opening window of the casing 5 . Setting the eccentric structure 23 can make the moving track of the milling shoe 22 always parallel to the beveling surface 11, and there is always a certain distance between the milling shoe 22 and the beveling surface 11, which can prevent the milling shoe 22 and the beveling surface 11 from contacting the cutting beveling surface 11, and reduce milling. The oblique device 1 can also be reused due to the wear and tear of the shoes 22, thereby avoiding the waste of parts and reducing the cost of opening the window of the casing 5. On this basis, the eccentric structure 23 and the power drill 21 can be fixed by screws, and the head of the screw can be used as a slider 231. During work, the head of the screw is embedded in the chute 12 and slides along the chute 12, both The fixing of the eccentric structure 23 and the power drilling tool 21 can be realized, and the milling shoe 22 can be moved parallel to the ramping surface 11. The structure is simple and reliable. The eccentric structure 23 and the power drilling tool 21 can be fixed by a plurality of screws, and the plurality of screws can be arranged along the axial direction of the power drilling tool 21, and all of them slide with the chute 12 of the ramping surface 11. On the one hand, the eccentric structure 23 can be increased. The firmness of fixing with the power drilling tool 21, on the other hand, can improve the reliability of the eccentric structure 23 sliding along the chute 12, can prevent a single screw from breaking away from the chute 12, and further prevent the milling shoe 22 from cutting the ramp 11. However, the number of screws should not be too many. Too many screws will increase the positioning accuracy of the screws and the slide groove 12. Taking the above factors into consideration, the number of screws in this embodiment is two.

During the windowing process of the coiled tubing window opening tool, the counter torque generated when the drilling tool assembly cuts the casing 5 will be transmitted upward to the coiled tubing 41 in the feeding mechanism. Since the tube wall of the coiled tubing 41 is thin, it cannot withstand cutting. Therefore, the coiled tubing window opening tool in the present invention also includes a torsion-bearing mechanism, which includes a torsion-bearing nipple 32 and a torsion-bearing sleeve 31, and the torsion-bearing nipple 32 is connected to the power drilling tool 21 , the torsion-bearing sleeve 31 is sleeved outside the torsion-bearing nipple 32 and fixed with the oblique device 1, the torsion-bearing sleeve 31 and the oblique device 1 can be fixed by screws or welding, and fixed in the well with the anchor mechanism to open a window position, the torsion joint 32 is slidably connected to the torsion sleeve 31 .

Specifically, the torsion joint 32 and the torsion sleeve 31 are connected by a flat key and a keyway, and the torsion joint 32 can slide along the torsion sleeve 31 through a flat key and a keyway, and the side wall of the torsion sleeve 31 A keyway and a helical chute 12 extending along the axial direction of the torsion-bearing sleeve 31 are arranged on the top, and the keyway is connected with the helical chute 12. The flat key fixed on the section 32 first slides into the spiral chute 12, and the flat key slides in the spiral chute 12, driving the torsion joint 32 to rotate. When the flat key has the spiral chute 12 and slides into the keyway, the torsion short The installation of the section 32 and the torque bearing sleeve 31, when working, the circumferential position of the torque bearing short joint 32 and the torque bearing sleeve 31 is fixed, and the torque bearing joint 32 can only slide relative to the torque bearing sleeve 31 along the keyway, and cannot be opposite to each other. The torsion sleeve 31 rotates. The installation method of the torsion joint 32 and the torsion sleeve 31 can limit the rotation of the power drill 21, and the reaction torque generated by the milling shoe 22 is transmitted from the power drill 21 to the torsion sleeve 31 and the torsion joint 32. Prevent the counter torque from being continuously transmitted upwards, avoid damage to the coiled tubing 41, and increase the service life of the coiled tubing 41.

The torsion-bearing mechanism also includes an anti-twist short joint 33 and an oil pipe 34 connected to each other, the anti-twist short joint 33 is connected to the feeding mechanism, and the oil pipe 34 is connected to the torsion-bearing short joint 32 . During the running of the torsion mechanism and the drilling tool assembly into the bottom of the well, the drilling tool assembly and the torsion sub 32 will rotate, and the anti-twist sub 33 is used to prevent the drilling tool assembly and the torsion sub 32 from moving The torque is transmitted to the coiled tubing 41 to further avoid damage to the coiled tubing 41 and improve the service life of the coiled tubing 41 . In addition, the anti-twist short joint 33 is also provided with a sealing device, which can prevent the drilling fluid from leaking.

The feeding mechanism in the present invention includes a coiled tubing 41 and a downhole tractor 42 , the coiled tubing 41 and the downhole tractor 42 are connected through a coiled tubing joint 43 , and the downhole tractor 42 is connected with the anti-twist nipple 33 through a safety joint 44 . The safety joint 44 can be disconnected from the anti-twist nipple 33 in an emergency, and the downhole tractor 42 is supported on the well wall during the window opening process of the milling shoe 22 to provide drilling pressure for the milling shoe 22 and push the drilling tool assembly along the The axial direction of the wellbore moves; after the sidetracking window is completed, the downhole tractor 42 lifts the coiled tubing 41 upwards, thereby pulling out the coiled tubing windowing tool, and ending the sidetracking windowing.

The specific working process of coiled tubing window tool provided by the invention is as follows:

(1) Lower the torsion sleeve 31 and the anchoring mechanism composed of the skewer 1 and the anchoring nipple 6 into the well, and fix them at the position where the window needs to be opened;

(2) Connect the feeding mechanism, torsion mechanism and drilling tool assembly in sequence. After the connection is completed, the feeding mechanism will smoothly enter the drilling tool assembly into the wellbore through the inlet. , reduce the running speed and control it at 0.5m/s, so that the milling shoe 22 can be sent into the torsion sleeve 31;

(3) After the flat key on the torsion joint 32 enters the spiral chute 12 on the torsion sleeve 31, the flat key is sent into the keyway by rotation to complete the installation of the torsion joint 32 and the torsion sleeve 31 ;

(4) The downhole tractor 42 is supported on the well wall to push the drilling tool assembly to move along the axis of the borehole and provide drilling pressure for the drilling tool assembly. The ramping surface 11 slides, the milling shoe 22 comes into contact with the casing 5, the mud pump on the well begins to circulate the drilling fluid into the well, and the power drilling tool 21 outputs torque to drive the milling shoe 22 to cut the casing 5;

(5) When the milling shoe 22 is completely moved out of the casing 5, the side windowing of the casing 5 is completed, and the downhole tractor 42 lifts the coiled tubing 41 upwards, thereby pulling out the coiled tubing windowing tool, and ending the sidetracking windowing.

The coiled tubing window opening tool provided by the present invention can avoid cutting the oblique device 1 when the milling shoe 22 cuts the casing 5, avoids damage to the oblique device 1, and reduces waste of parts; at the same time, it can reduce the wear of the milling shoe 22 and improve service life, reduce the cost of casing 5 side window; by adjusting the installation position of the eccentric structure 23 on the power drilling tool 21, the mechanical characteristics of the milling shoe 22 can also be adjusted; the coiled tubing 41 can be prevented from being cut by the torsion mechanism When the torque is square, the coiled tubing 41 is prevented from being damaged; during the sidetracking window opening process, the coiled tubing window opening tool has small working resistance, the milling shoe 22 has controllable mechanical properties and reliable working performance.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (10)

1. A coiled tubing window opening tool is characterized in that it comprises a skewer (1) and a drilling tool assembly, and the drilling tool assembly includes a power drilling tool (21) and a milling shoe (22), and the power drilling tool One end of (21) is connected to the milling shoe (22), and the power drill (21) is fixed with an eccentric structure (23), and the eccentric mechanism (23) can follow the ramping surface of the inclined device (1) (11) SLIDE. 2. The coiled tubing window opening tool according to claim 1, characterized in that, the power drilling tool (21) and the milling shoe (22) are connected by a flexible short joint (24). 3. The coiled tubing window opening tool according to claim 1, characterized in that, the eccentric structure (23) is provided with a slider (231) projecting toward the ramping surface (11), and the ramping surface (11) A chute (12) extending along the length direction of the ramp (11) is provided, and the slider (231) can slide along the chute (12). 4. The coiled tubing window opening tool according to claim 3, characterized in that, the eccentric structure (23) is a sleeve set outside the power drilling tool (21), and the sleeve and the The power drill (21) is fixed by screws, the head of the screw forms the slide block (231), and the head of the screw slides along the chute (12). 5. The coiled tubing window opening tool according to any one of claims 1-4, further comprising a torsion-bearing mechanism, the torsion-bearing mechanism comprising a torsion-bearing nipple (32) and a torsion-bearing sleeve (31 ), the torsion joint (32) is connected to the power drilling tool (21), the torsion sleeve (31) is sleeved outside the torsion joint (32) and connected to the oblique The device (1) is fixed, and the torsion joint (32) is slidably connected to the torsion sleeve (31). 6. The coiled tubing window opening tool according to claim 5, characterized in that, the side wall of the torsion sleeve (31) is provided with a shaft extending along the axial direction of the torsion sleeve (31). A keyway and a spiral chute (12), the keyway is connected with the spiral chute (12), the torsion joint (32) is provided with a flat key, and the flat key moves along the spiral chute (12) ) slide into the keyway. 7. The coiled tubing window opening tool according to claim 5, characterized in that, the torsion-bearing mechanism further comprises an anti-twist short joint (33) and an oil pipe (34) connected to each other, and the anti-twist short joint (33 ) is connected to the feeding mechanism, and the oil pipe (34) is connected to the torsion joint (32). 8. coiled tubing window tool as claimed in claim 7, is characterized in that, described sending mechanism comprises coiled tubing (41) and downhole tractor (42), and described coiled tubing (41) and downhole tractor ( 42) Connected through a continuous pipe joint (43), the downhole tractor (42) is connected with the anti-twist nipple (33) through a safety joint (44). 9. The coiled tubing window opening tool according to claim 5, characterized in that, the skewer (1) and the torsion sleeve (31) are fixed by screws or welding. 10. The coiled tubing window opening tool according to any one of claims 1-4, characterized in that, the bottom end of the skewer (1) is connected with an anchor nipple (6).