CN115263214A - Coiled tubing drilling underground anti-torsion supporting device and drilling anti-torsion supporting system - Google Patents

Abstract

The invention discloses an anti-torsion support device for coiled tubing drilling downhole and an anti-torsion support system while drilling, comprising a central spline pipe, on which is sleeved a cylindrical electric control hydraulic assembly and an anti-torsion support assembly; the anti-torsion support assembly includes a support groove and a mounting cylinder, and a first chamber is reserved between the support groove and the central spline pipe, and the A support mechanism is arranged in the first chamber, a second chamber is reserved between the installation cylinder and the central spline tube, and a rotation mechanism is arranged in the second chamber. The effect is as follows: the fluid pressure difference inside and outside the coiled tubing is used as the driving force, and the electric control hydraulic power assembly is used to control the action of the rotating mechanism, so as to drive the support mechanism to expand in the radial direction, so that the support mechanism is in close contact with the drilling well wall, which is conducive to the drilling downhole. The reaction torque generated by the power drilling tool is transmitted to the borehole wall, which reduces the alternating torsional force on the coiled tubing during drilling.

Description

Downhole anti-torsion support device for coiled tubing drilling and anti-torsion support system while drilling

technical field

The invention belongs to the field of oil and gas well engineering, and in particular relates to a downhole anti-torsion support device for coiled tubing drilling and an anti-torsion support system while drilling.

Background technique

Coiled tubing is widely used in oil and gas field workover, drilling, well completion, well logging and other operations, and is playing an increasingly important role in oil and gas field exploration and development. Domestic coiled tubing is mainly used in sand flushing, drilling bridge plugs, gas lift, liquid nitrogen injection, wax removal, liquid drainage, acid squeezing and coordination testing. It has broad application prospects.

However, the downhole operation technology of coiled tubing still has the following problems to be solved urgently:

First, when the drill bit breaks the rock during the drilling operation, the continuously alternating counter torque of the drill bit in the uneven formation will be transmitted to the coiled tubing through the bottom hole assembly. Under the joint action of the axial load, the downhole coiled tubing is prone to produce Buckling self-locking speeds up fatigue damage of coiled tubing;

Second, the coiled tubing has low rigidity, and the coiled tubing is prone to torsional deformation under the action of torque, which makes the orientation tool surface unstable and increases the difficulty of orientation. Therefore, it is necessary to add a downhole anti-torsion device between the coiled tubing and the downhole directional tool to transmit the bottom hole reaction torque to the well wall, reduce the alternating anti-torsion load of the coiled tubing, and increase the stability and orientation accuracy of the downhole directional tool face.

In order to solve the above problems, in-hole anti-torque support tools came into being. The principle is to transmit the counter torque of the drill bit to the well wall through the well wall support, so as to reduce the torque on the coiled tubing and improve the directional stability of the directional tool.

Currently, there are few anti-torsion support tools disclosed in the prior art. These anti-torsion support tools can be roughly divided into cam locking type and hydraulic support type according to the support methods.

First of all, the cam-locking anti-torsion support tool generally contacts the well wall by rotating the cam on the tool, and then rotates the cam through the counter torque of drilling, so that the distance between the contact point of the cam and the well wall and the central axis of the tool Increase continuously until the tool is locked with the well wall, so as to achieve the purpose of anti-twist. The main disadvantages of this device are:

(1) The cam-locking anti-torque support tool increases the contact force between the cam and the well wall through the counter torque generated by drilling, so that the torque is transmitted to the well wall and the torque is blocked from being transmitted backward. Considering that the drilled wellbore is not a standard circular or in the formation with low wellwall strength, excessive torsion will cause the cam to be inserted too deep into the wellwall or even reversed, making the cam unable to reset, affecting normal drilling or even jamming drill;

(2) Considering that during coiled tubing drilling, the torsion-resistant support tool cannot move with drilling after contacting the well wall, and the torque cannot be prevented from being transmitted to the coiled tubing behind the device after retracting the cam, so it is not suitable for downhole torsion resistance of coiled tubing drilling. Operation.

Secondly, the hydraulically supported anti-torsion support tool (such as an in-hole drilling wall support mechanism disclosed in the Chinese invention patent application 202010987936.3) uses a small downhole hydraulic pump as the power source, and pushes the high-pressure oil to the oil behind the support block through the high-pressure oil circuit. In the cavity, the support block is pushed out to support the well wall, and the counter torque is transmitted to the well wall, preventing the torque from continuing to be transmitted backwards. The main disadvantages of this device are:

(1) The hydraulically supported torsion-resistant support tool pushes the high-pressure oil into the oil chamber behind the support block through the high-pressure oil circuit, pushes the support block to contact the well wall, and generates pressure on the well wall. However, if you want to use the static friction force generated by the force of the support block on the well wall to resist the reaction torque generated during drilling, you need to push the pressure difference between the hydraulic oil in the oil chamber of the support block and the drilling annulus to be very high. It is difficult to ensure the sealing ability of the sealing device under the condition of uneven force and huge internal and external pressure difference on the sealing surface of the support block;

(2) Due to the very high pressure difference between the hydraulic oil in the oil chamber of the push support block and the drilling annulus, the power requirement for the motor driving the hydraulic pump is also high. At present, the price of small high-power motors at home and abroad is relatively high. Undoubtedly, the manufacturing cost of the torsion support tool is increased.

To sum up, whether it is the cam locking type or the hydraulic support type, the feasibility of these coiled tubing downhole torsion support tools is not strong, and they cannot meet the requirements of large axial tensile pressure and high axial tensile pressure in complex downhole environments when drilling deep wells and ultra-deep wells with coiled tubing. Larger axial torque is required.

Contents of the invention

In order to overcome the defects of the prior art, one of the objects of the present invention is to provide a downhole anti-torsion support device for coiled tubing drilling, which uses the fluid pressure difference inside and outside the coiled tubing as the driving force, and uses an electronically controlled hydraulic assembly to control the movement of the rotating mechanism , so as to drive the supporting mechanism to expand radially, which is beneficial to transmit the reaction torque generated by the downhole power drilling tool to the well wall, greatly reducing the torque on the coiled tubing during drilling, and improving the service life of the coiled tubing and the reliability of coiled tubing drilling ROP; another object of the present invention is to provide a anti-torsion support system while drilling, which uses a telescopic mechanism assembly to connect the upper and lower two-stage anti-torsion support devices, so that it can move while drilling, with a wide range of applications and complete functions .

In order to achieve the above purpose, the following design scheme is adopted:

The present invention firstly discloses a coiled tubing drilling downhole anti-torsion support device, the key of which is that it includes a central spline tube (1) for the circulation of drilling high-pressure fluid, and the central spline tube (1) is socketed by a spline There is a cylindrical electronically controlled hydraulic assembly (2) and a torsion support assembly (3); the torsion support assembly (3) includes a support groove (301) and a mounting cylinder (302), A first chamber is reserved between the support tank (301) and the central spline tube (1), and a support mechanism (304) is arranged in the first chamber, and a support mechanism (304) is arranged in the installation cylinder A second chamber is reserved between (302) and the central spline tube (1), and a rotating mechanism (306) is arranged in the second chamber; wherein: the electronically controlled hydraulic assembly (2 ) is used to control the rotation mechanism (306) to drive the support mechanism (304) to radially expand or retract, so as to close or cut off the torque transmission between the anti-torsion support device and the drilling well wall.

Furthermore, the support mechanism (304) includes a camshaft (308) and several support blocks (309) arranged around the circumference of the camshaft (308), and elastic connections between two adjacent support blocks (309) part (307); when the camshaft (308) rotates, the support block (309) can radially expand and contract through the corresponding slot (310) of the support tank (301).

Furthermore, the camshaft (308) is supported on the bottom of the support tank (301) through a return spring (311), and a return cylinder (303) is also arranged on the support tank (301). ), the top of the return cylinder (303) is sealed with an end cover (312), and a first snap-fit structure that can be opened and closed is also provided between the end cover (312) and the camshaft (308) .

Furthermore, the rotating mechanism (306) includes an oblique spline shaft (315) and an oblique spline cylinder (316) arranged below the oblique spline shaft (315), when the oblique spline cylinder (316 ) can realize forward or reverse rotation of the oblique spline shaft (315) when moving axially; The second locking structure, when the second locking structure is in an engaged state, the camshaft (308) can rotate along with the rotation of the oblique spline shaft (315).

Furthermore, a third chamber is reserved between the return cylinder (303) and the central splined pipe (1), and a return piston cylinder (313) is formed in the third chamber. The return piston cylinder (313) is provided with a return piston rod (314) connected to the camshaft (308); the electronically controlled hydraulic assembly (2) can control the return piston rod ( 314) Drive the camshaft (308) to move in the axial direction, so as to realize the opening and closing of the first locking structure or the second locking structure.

Furthermore, a drive cylinder (305) is provided at the bottom of the installation cylinder (302), and a fourth chamber is reserved between the drive cylinder (305) and the central spline tube (1) , a drive piston cylinder (317) is formed in the fourth chamber, a drive piston rod (318) connected with the oblique spline barrel (316) is arranged in the drive piston cylinder (317), the The electronically controlled hydraulic assembly (2) can control the driving piston rod (318) to drive the oblique spline barrel (316) to move axially.

Furthermore, the anti-torsion support assembly (3) also includes a volume compensation mechanism (319), and the volume compensation mechanism (319) is accompanied by the return piston rod (314) and the driving piston rod (318) Action, dynamically balance the pressure of the first chamber, the second chamber, the third chamber and the fourth chamber; wherein: the volume compensation mechanism (319) includes a volume compensation cylinder (320 ), the volume compensation cylinder (320) is also provided with a dynamic compensation piston (321), and on the cylinder wall at the upper end of the volume compensation cylinder (320), there is also a drilling fluid flow channel communicating with the annulus of the torsion support device. mouth.

Furthermore, the electronically controlled hydraulic assembly (2) includes an electric control system (201) and a hydraulic system (202), and the hydraulic system (202) includes a lumen communicating with the central spline tube (1) and The drilling fluid circulation channel in the annulus of the anti-torsion support device is provided with a valve assembly in the drilling fluid circulation channel; wherein: the electric control system (201) can utilize the return flow by switching the valve position of the valve assembly The axial movement of the position piston rod (314) and the fluid pressure difference on both sides of the drive piston rod (318) is controlled by the fluid pressure difference.

Based on the structure described above, the present invention also discloses a anti-torsion support system while drilling. 5), between the upper joint (4) and the lower joint (5), there are upper and lower two-stage anti-torsion support devices, and the telescopic mechanism assembly (6 )connect.

Furthermore, the central spline tubes of the upper and lower torsion support devices are shared, and the torsion support assemblies of the upper and lower torsion support devices can be mounted on the central spline tube Axial sliding; wherein: the telescopic mechanism assembly (6) includes a telescopic cylinder (601) connected to the upper-level torsion support assembly (3a), and the telescopic cylinder (601) is provided with a The telescopic piston rod (602) connected to the assembly (3b), the telescopic piston rod (602) is controlled by the electronically controlled hydraulic assembly of the torsion support device at the upper level.

Compared with the prior art, the present invention has the following remarkable effects:

(1) The anti-torsion support device uses the fluid pressure difference inside and outside the coiled tubing as the driving force, and uses the electronically controlled hydraulic assembly to control the action of the rotating mechanism, so as to drive the support mechanism to expand in the radial direction, so that the support mechanism closely contacts the drilling wall. It is beneficial to transmit the reaction torque generated by the downhole power drilling tool to the well wall, which reduces the alternating torsional force on the coiled tubing during drilling and reduces the replacement frequency of the coiled tubing;

(2) There is no need for electric pumps to provide driving force, which reduces the load of the coiled tubing built-in cable while reducing the manufacturing cost, and avoids failures caused by the inability to effectively dissipate heat due to excessive electrical loads in underground high-temperature and high-pressure environments;

(3) Design the power-off protection mechanism based on the return spring, the first snap-in structure, and the second snap-in structure. On the one hand, it can ensure the stable operation of the device, and on the other hand, the support mechanism can be automatically retracted even if the power is off, so that To prevent stuck drill, the operation is more convenient;

(4) The anti-torsion support system while drilling is alternately supported on the drilling well wall through the upper and lower torsion support assemblies, and cooperates with the telescopic movement of the telescopic mechanism assembly, which not only satisfies the role of torque resistance, but also realizes the function of the support system. It moves while drilling and has complete functions, which can adapt to various downhole operations such as drilling, completion and workover of deep and ultra-deep wells.

Description of drawings

Fig. 1 is the subjective schematic diagram of the anti-torsion support device in the first embodiment;

2 is a schematic diagram of the internal structure of the torsion support device in Embodiment 1;

Fig. 3 is a schematic diagram of the cross-section along C-C in Fig. 2 when the torsion support device is connected to the downhole pipe string and is not working;

Fig. 4 is a schematic diagram of the D-D section in Fig. 2 when the torsion support device is connected when the downhole pipe string is not working;

Fig. 5 is a schematic diagram of the E-E section in Fig. 2 when the torsion support device is connected to the downhole pipe string and is not working;

Fig. 6 is a three-dimensional schematic diagram of an end cap in Embodiment 1;

Fig. 7 is a three-dimensional schematic diagram of a support block in Embodiment 1;

Fig. 8 is a three-dimensional schematic diagram of a support tank in an embodiment;

Fig. 9 is a three-dimensional schematic diagram of the camshaft in Embodiment 1;

Fig. 10 is a three-dimensional schematic diagram of the oblique spline shaft in Embodiment 1;

Fig. 11 is a three-dimensional schematic diagram of the oblique spline cylinder in Embodiment 1;

Fig. 12 is a three-dimensional schematic diagram of installing the cylinder in embodiment one;

Figure 13a is a subjective schematic diagram of the central splined tube in Embodiment 1;

Figure 13b is a schematic top view of the central spline tube in Embodiment 1

Fig. 14 is a schematic diagram of the internal structure of the anti-torsion support system while drilling in the first embodiment;

Figure 15 is a schematic diagram of the internal structure of the anti-torsion support system while drilling when it is not working at the initial position downhole

Figure 16 is a schematic diagram of the internal structure when the camshaft engages with the oblique spline shaft at the initial position of the anti-torsion support system while drilling

Figure 17 is a schematic diagram of the internal structure when the lower support block supports the well wall at the initial position of the anti-torsion support system while drilling

Fig. 18 is a schematic diagram of the state when the upper (lower) support block of the anti-torsion support system while drilling supports the well wall;

Fig. 19 is a schematic diagram of the state when the support block supports the well wall on the anti-torsion support system while drilling;

Fig. 20 is a schematic diagram of the state when the upper (lower) support block of the anti-torsion support system while drilling supports the well wall and the telescopic hydraulic cylinder is extended;

Fig. 21 is a schematic diagram of the state when the lower support block of the anti-torsion support system while drilling supports the well wall and the telescopic hydraulic cylinder is extended;

Fig. 22 is a schematic diagram of the state when the lower support block of the anti-torsion support system while drilling supports the well wall and the telescopic hydraulic cylinder is retracted;

Numbers in the figure: 1-central spline tube, 2-electrically controlled hydraulic assembly, 3-torsion support assembly, 301-support groove, 302-installation cylinder, 303-return cylinder, 304-support Mechanism, 305-drive cylinder, 306-rotation mechanism, 307-elastic part, 308-camshaft, 309-support block, 310-notch, 311-return spring, 312-end cover, 313-return piston cylinder, 314-return piston rod, 315-oblique spline shaft, 316-oblique spline barrel, 317-drive piston cylinder, 318-drive piston rod, 319-volume compensation mechanism, 320-volume compensation cylinder, 321-dynamic compensation piston , 322-first card slot, 323-second card slot, 324-third card slot, 325-fourth card slot, 326-thrust bearing, 201-electric control system, 202-hydraulic system, 4-upper joint , 5-bottom joint, 6-telescopic mechanism assembly, 601-telescopic cylinder, 602-telescopic piston rod, 603-telescopic cylinder head, 3081-hollow shaft, 3082-petal cam, 3083-flange, 3151- Oblique spline tooth, 3152-boss, 3161-oblique spline groove;

3a-upper torsion support assembly, 201a-upper power control system, 202a-upper hydraulic system, 308a-upper camshaft, 309a-upper support block, 311a-upper return spring, 312a-upper end cover, 314a-upper return Position piston rod, 315a-upward inclined spline shaft, 316a-upward inclined spline barrel, 318a-upper driving piston rod, 321a-upper dynamic compensation piston;

3b-lower torsion support assembly, 201b-lower electric control system, 202b-lower hydraulic system, 308b-lower camshaft, 309b-lower support block, 311b-lower return spring, 312b-lower end cover, 314b-lower return Position piston rod, 315b-downward inclined spline shaft, 316b-downward inclined spline barrel, 318b-lower driving piston rod, 321b-upper dynamic compensation piston;

401-upward return piston cylinder waterway, 402-upper drive piston cylinder upper end waterway, 403-upper drive piston cylinder lower end waterway, 404-upper torsion support assembly drilling fluid outflow channel, 405-upper torsion support assembly drilling fluid Inflow channel, 406-water channel at the upper end of telescopic piston cylinder, 407-water channel at the lower end of telescopic piston cylinder, 409-drilling fluid inflow channel of lower torsion support assembly, 410-drilling fluid outflow channel of lower torsion support assembly, 412-upper end of piston cylinder Waterway, 413-waterway at the lower end of the lower driving piston cylinder, 414-waterway at the lower end of the piston cylinder

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention. In addition, in the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Figures 1 and 2 show the first embodiment of the present invention: a downhole anti-torsion support device for coiled tubing drilling, including a central splined tube 1 for the circulation of drilling high-pressure fluid, and the central splined tube 1 passes through The spline is sleeved with a cylindrical electronically controlled hydraulic assembly 2 and a torsion support assembly 3; the torsion support assembly 3 includes a support tank 301 and an installation cylinder 302, and the support tank A first chamber is reserved between 301 and the central splined tube 1, a support mechanism 304 is set in the first cavity, and a pre-installed chamber is provided between the installation cylinder 302 and the central splined tube 1. A second chamber is left, and a rotating mechanism 306 is arranged in the second chamber; wherein: the electro-hydraulic assembly 2 is used to control the rotating mechanism 306 to drive the support mechanism 304 to expand or Retract to close or cut off torque transmission between the torsion brace and the wellbore wall.

As shown in Figures 3 and 4, the support mechanism 304 includes a camshaft 308 and several support blocks 309 arranged around the circumference of the camshaft 308, and elastic members 307 are connected between two adjacent support blocks 309; When the camshaft 308 rotates, the support block 309 can radially expand and contract through the corresponding slot 310 of the support tank 301 .

It can be seen from FIG. 8 that the camshaft 308 includes a hollow shaft body 3081 and a petal cam 3082 arranged on the hollow shaft body 3081. The outer contour of the petal cam 3082 is composed of several tangent arcs. . Preferably, two sets of petal-type cams 3082 are provided, and the two sets of petal-type cams 3082 are respectively arranged close to the upper and lower ends of the hollow shaft body 3; specifically, three grooves are evenly distributed on the support groove cylinder according to the circumference The slot 310 is arranged in a strip shape, and the support block 309 is correspondingly arranged in a cuboid structure adapted to the strip-shaped slot 310 . In order to prevent the drilling fluid from penetrating into the support tank 301 , an interference-fit sealing ring is provided between the notch 310 and the corresponding support block 309 .

As shown in Figure 2, during specific implementation, the camshaft 308 is supported on the bottom of the support tank 301 by a return spring 311, and a return cylinder 303 is also arranged on the support tank 301, the The top of the return cylinder 303 is sealed with an end cover 312 , and a first snap-fit structure that can be opened and closed is also provided between the end cover 312 and the camshaft 308 .

In this embodiment, the return cylinder 303 is connected and fixed with the support tank 301 by screws, and the contact surface between the two is sealed by a sealing gasket; The first locking groove 322 and the second locking groove 323 provided at the upper end of the camshaft 308; a flange 3083 abutting against the return spring 311 is also formed on the cylindrical surface of the lower end of the camshaft 308.

As shown in FIG. 5 , the rotating mechanism 306 includes a slanted spline shaft 315 and a slanted spline barrel 316 arranged below the slanted spline shaft 315, when the slanted spline barrel 316 moves axially, the Forward rotation or reverse rotation of the oblique spline shaft 315; as shown in FIG. When the second locking structure is in the engaged state, the camshaft 308 can rotate along with the rotation of the oblique spline shaft 315 .

Please refer to FIG. 9 to FIG. 12 , the second locking structure includes a third locking groove 324 set on the upper end of the oblique spline shaft 315 and a second locking groove 325 set on the lower end of the camshaft 308 , the oblique spline The key shaft 315 extends into the return spring 311 through the central spline hole at the bottom of the support tank 301 , and the outer peripheral surface of the lower end of the oblique spline shaft 315 is processed with oblique spline teeth 3151 . As a preference, two sections of bosses 3152 are also provided on the shaft body of the oblique spline gear 315. For the convenience of assembly, at least one section of the bosses 3152 is detachably installed by screw connection or pin connection. A thrust bearing 326 is provided between the section boss 3152 and the bottom of the support tank 301 . An oblique spline groove 3161 matching with the oblique spline teeth 3151 is processed on the inner peripheral surface of the oblique spline barrel 316

As shown in Figure 2, in order to cut off and close the torque transmission between the oblique spline shaft 315 and the camshaft 308, a third chamber is reserved between the return cylinder 303 and the central spline tube 1, so A return piston cylinder 313 is formed in the third chamber, and a return piston rod 314 connected to the camshaft 308 is arranged in the return piston cylinder 313; the electronically controlled hydraulic assembly 2 can control The return piston rod 314 drives the camshaft 308 to move axially, so as to realize the opening and closing of the first locking structure or the second locking structure.

In order to convert the axial thrust into axial torsion force and drive the camshaft 308 to rotate, a drive cylinder 305 is arranged at the bottom of the installation cylinder 302, and the drive cylinder 305 is connected to the center spline tube 1 A fourth chamber is reserved, and a driving piston cylinder 317 is formed in the fourth chamber, and a driving piston rod 318 connected with the oblique spline barrel 316 is arranged in the driving piston cylinder 317. The hydraulic control assembly 2 can control the driving piston rod 318 to drive the oblique spline barrel 316 to move in the axial direction.

During specific implementation, the anti-torsion support assembly 3 also includes a volume compensation mechanism 319, and the volume compensation mechanism 319 dynamically balances the first chamber along with the action of the return piston rod 314 and the drive piston rod 318 , the pressures of the second chamber, the third chamber and the fourth chamber; wherein: the volume compensation mechanism 319 includes a volume compensation cylinder 320, and a dynamic compensation cylinder 320 is also provided in the volume compensation cylinder 320 The piston 321 is also provided with a drilling fluid flow port communicating with the annulus of the torsion support device on the cylinder wall at the upper end of the volume compensation cylinder 320 .

In actual application, in order to meet the heat dissipation and lubrication needs of the device, it is preferable to fill each chamber with oil, and since this embodiment uses the pressure difference between the drilling fluid in the annulus of the device and the drilling fluid circulating in the central splined pipe 1 Therefore, when the drilling fluid enters each piston cylinder, the increase of the drilling fluid on one side of the piston must compress the oil fluid space, resulting in an increase in the hydraulic pressure of the oil. When the hydraulic pressure of the oil is too strong, it will inevitably cause the support mechanism 304 to operate difficulty. In view of this, introducing the oil fluid into the volume compensation cylinder 320 after the drilling fluid enters can ensure that the pressure inside the device remains constant, which is beneficial to the stable operation of the support mechanism 304 . It should be noted that the volume compensating cylinder 320 can be formed in the third chamber, or can be formed in the peripheral space of the central splined tube 1 through an independent cylinder. When the volume compensating cylinder 320 is formed in the third chamber, since the parts forming the first chamber, the second chamber and the third chamber are all socketed on the central spline tube 1 through splines, the splines and The gap between the splines can be used as the oil flow channel, so there is no need to design a special oil flow path.

In a specific application scenario, the electronically controlled hydraulic assembly 2 includes an electric control system 201 and a hydraulic system 202. Drilling fluid circulation channel, in which a valve assembly is set; wherein: the electric control system 201 can use the return piston rod 314 and the drive piston to switch the valve position of the valve assembly The fluid pressure differential across the piston of rod 318 controls the axial movement of both.

Please refer to Fig. 13, based on the foregoing description, this embodiment also discloses a torsional support system while drilling, including an upper joint 4 for connecting coiled tubing or a heavy drill pipe and a lower joint 5 for connecting drilling tools, Between the upper joint 4 and the lower joint 5 , an upper and a lower two-stage anti-torsion support device are arranged oppositely, and the two-stage anti-torsion support device is connected by a telescopic mechanism assembly 6 .

During specific implementation, the central spline tubes of the torsion support devices of the upper and lower stages are shared, and the torsion support assemblies of the torsion support devices of the upper and lower stages can be mounted on the central spline tube Axial sliding; wherein: the telescopic mechanism assembly 6 includes a telescopic cylinder 601 connected to the upper-level torsion support assembly 3a, and the telescopic cylinder 601 is provided with a telescopic piston rod connected to the lower-level support assembly 3b 602, the telescopic piston rod 602 is controlled by the electronically controlled hydraulic assembly of the upper-level anti-torsion support device.

Below in conjunction with embodiment a pair of principle of the present invention is explained:

When coiled tubing is used for deep wells, ultra-deep wells or directional drilling operations, due to the low rigidity of coiled tubing, the counter torque generated by drilling will cause the directional tool face to deviate and change the drilling direction. The anti-torsion support system while drilling can be adjusted to the initial position, connected to the downhole power motor, and the state in Figure 18 is the starting state of the work. The working process is divided into the following steps:

The first step, as shown in Figure 15, at this time, the upper-level power control system 201a and the lower-level power control system 201b are not powered on, and the water channel 402 at the upper end of the upper drive piston cylinder flows out of the water channel through the upper-level hydraulic system 202a and the upper torsion support assembly. 404 is connected, the water channel 403 at the lower end of the upper driving piston cylinder is connected with the drilling fluid inflow channel 405 of the upper torsion support assembly through the upper hydraulic system 202a, and the water channel 413 at the lower end of the lower driving piston cylinder is connected with the lower torsion support assembly through the lower hydraulic system 202b The drilling fluid outflow channel 410 is connected, the upper end water channel 412 of the lower driving piston cylinder is connected with the drilling fluid inflow channel 409 of the lower torsion support assembly through the lower hydraulic system 202b, and the upper support block 309a and the lower support block 309b of the support system are in retracted state; The water channel 401 of the upper return piston cylinder communicates with the drilling fluid outflow channel 404 of the upper torsion support assembly through the upper hydraulic system 202a, and the lower return piston cylinder water channel 414 communicates with the drilling fluid of the lower torsion support assembly through the lower hydraulic system 202b The water channel 410 is connected, the upper anti-torsion support assembly 3a and the lower anti-torsion support assembly 3b are filled with oil, the oil hydraulic pressure is the same as the air pressure of the outer ring of the device through the upper dynamic compensation piston 321a and the lower dynamic compensation piston 321b, and the upper camshaft 308a is pushed by the upper return spring 311a, so that the upper camshaft 308a slot engages with the upper end cover 312a slot, and the lower camshaft 308b is pushed by the lower return spring 311b, so that the lower camshaft 308b slot engages with the lower end cover 312b slot; The water channel 406 at the upper end of the piston cylinder communicates with the drilling fluid outflow channel 404 of the upper torsion support assembly through the upper hydraulic system 202a, and the water channel 407 at the lower end of the telescopic piston cylinder communicates with the drilling fluid inflow channel 405 of the upper torsion support assembly through the upper hydraulic system 202a , the upper torsion support assembly 3a and the lower torsion support assembly 3b are close to each other; the upper torsion support assembly 3a is located at one-third of the upper end of the total stroke.

In the second step, as shown in Figure 16, when the well wall needs to be supported, the power supply is turned on in the initial state, the power supply for controlling the upward return piston rod 314a in the superior power control system 201a is turned on, and the upward return piston cylinder water channel 401 passes through The upper hydraulic system 202a communicates with the drilling fluid inflow channel 405 of the upper anti-torque support assembly, and the upper return piston rod 314a pushes the upper camshaft 308a, so that the upper camshaft 308a slot engages with the upper inclined spline shaft 315a slot, and the lower level In the power control system 201a, the power supply controlling the lower return piston rod 314b is turned on, the lower return piston cylinder water channel 414 communicates with the drilling fluid inflow channel 409 of the lower torsion support assembly through the lower hydraulic system 202b, and the lower return piston rod pushes The lower camshaft 308b makes the slot of the lower camshaft 308b engage with the slot of the lower inclined spline shaft 315b.

In the third step, as shown in Figure 17, the power supply controlling the lower drive piston rod 318b in the lower power control system 201a is turned on, and the water channel 413 at the lower end of the lower drive piston cylinder flows out through the lower hydraulic system 202b and the lower torsion support assembly The water channel 410 is connected, and the water channel 412 at the upper end of the lower driving piston cylinder is connected with the drilling fluid inflow channel 409 of the lower anti-torsion support assembly through the lower hydraulic system 202b, so that the lower driving piston rod 318b moves downward and pushes the downward inclined spline barrel 316b down. This drives the downwardly inclined spline shaft 315b to rotate, and the downwardly inclined spline shaft 315b drives the cam on the lower camshaft 308b to rotate, so that the three lower support blocks 309b are pushed outward to generate pressure on the well wall, and the reaction generated by drilling The torque is transmitted to the well wall; the upper-stage anti-torsion support assembly 3a is located at one-third of the upper end of the total stroke.

The fourth step, as shown in Figure 18, as the drilling progresses, the central splined pipe 1 moves downward, and the upper-level torsion support assembly 3a approaches the upper end of the total stroke. At this time, the upper-level power control system 201a controls the upper drive When the power supply of the piston rod 318a is turned on, the water channel 403 at the lower end of the upper drive piston cylinder communicates with the drilling fluid inflow channel 405 of the upper anti-torsion support assembly through the upper hydraulic system 202a, and the upper end water channel 402 of the upper drive piston cylinder communicates with the upper end water channel 402 through the upper hydraulic system 202a. The drilling fluid outflow channel 404 of the anti-torsion support assembly is connected, so that the upper driving piston rod 318a moves upward, and pushes the upwardly inclined spline barrel 316a to move upward, thereby driving the upwardly inclined spline shaft 315a to rotate, and the upwardly inclined spline shaft 315a drives the upper The cam on the camshaft 308a rotates, so that the three upper support blocks 309a are propped up outward to generate pressure against the well wall, and the counter torque generated by drilling is transmitted to the well wall.

The fifth step, as shown in Figure 19, as the drilling progresses, the central spline rod 1 moves downward, and the upper-level torsion support assembly 3a approaches the upper end of the total stroke. At this time, the lower-level power control system 201a controls the lower drive The power supply of the piston rod 318b is disconnected, the waterway 413 at the lower end of the lower drive piston cylinder communicates with the drilling fluid inflow channel 409 of the lower torsion support assembly through the lower hydraulic system 202b, and the upper end waterway 412 of the lower drive piston cylinder communicates with the lower end waterway 413 through the lower hydraulic system 202b. The drilling fluid outflow channel 410 of the anti-torsion support assembly is connected, so that the lower driving piston rod 318b moves upward, and pulls the downwardly inclined spline barrel 316b to move upward, thereby driving the downwardly inclined spline shaft 315b to rotate in the reverse direction, and the downwardly inclined spline shaft 315b then The cam on the lower camshaft 308b is driven to rotate, and then the three lower support blocks 309b are retracted through the elastic member.

The sixth step, as shown in Figure 20, as the drilling progresses, the central splined pipe 1 moves downward, and the upper end of the total stroke of the upper-level torsion support assembly 3a approaches. At this time, the upper-level power control system 201a controls the telescopic piston rod 602 is powered on, the water channel 407 at the lower end of the telescopic piston cylinder communicates with the drilling fluid outflow channel 404 of the upper torsion support assembly through the upper hydraulic system 202a, and the upper end water channel 406 of the telescopic piston cylinder communicates with the upper torsion support assembly through the upper hydraulic system 202a. Drilling fluid flows into the water channel 405 to communicate, so that the telescopic piston rod 602 moves downward, and pushes the lower anti-torsion support assembly 3b to move downward; When the cover 603 is in contact, the power supply controlling the lower drive piston rod 318b in the lower power control system 201a is turned on, and the water channel 413 at the lower end of the lower drive piston cylinder communicates with the drilling fluid outflow channel 410 of the lower torsion support assembly through the lower hydraulic system 202b, and the lower The water channel 412 at the upper end of the driving piston cylinder communicates with the drilling fluid inflow channel 409 of the lower torsion support assembly through the lower hydraulic system 202b, so that the lower driving piston rod 318b moves downward, and pushes the downwardly inclined spline barrel 316b to move downward to drive the downwardly inclined The spline shaft 315b rotates, and the downwardly inclined spline shaft 315b drives the cam on the lower cam shaft 308b to rotate, so that the three lower support blocks 309b are propped up outward to generate pressure on the well wall, and the counter torque generated by drilling is transmitted to the well wall superior.

The seventh step, as shown in Figure 21, as the drilling progresses, the central splined pipe 1 moves downward, and the upper-level torsion support assembly 3a approaches the upper end of the total stroke. At this time, the upper-level power control system 201a controls the upper drive The power supply of the piston rod 318a is disconnected, the water channel 403 at the lower end of the upper driving piston cylinder communicates with the drilling fluid outflow channel 404 of the upper anti-torsion support assembly through the upper hydraulic system 202a, and the upper end water channel 402 of the upper driving piston cylinder communicates with the upper end water channel 402 through the upper hydraulic system 202a. The drilling fluid of the anti-torsion support assembly flows into the water channel 405 to communicate, so that the upper driving piston rod 318a moves downward, and pulls the upwardly inclined spline barrel 316a to move downward, thereby driving the upwardly inclined spline shaft 315a to rotate in reverse, and the upwardly inclined spline shaft 315a Then drive the cam on the upper camshaft 308a to rotate, and then make the three upper support blocks 309a withdrawn through the upper elastic member.

The eighth step, as shown in Figure 22, as the drilling progresses, the central splined pipe 1 moves downward, and the upper-level torsion support assembly 3a moves to the uppermost end of the total stroke. At this time, the upper-level power control system 201a controls the expansion The power supply of the piston rod 602 is disconnected, the water channel 407 at the lower end of the telescopic piston cylinder communicates with the drilling fluid inflow channel 405 of the upper torsion support assembly through the upper hydraulic system 202a, and the upper end water channel 406 of the telescopic piston cylinder communicates with the upper torsion support assembly through the upper hydraulic system 202a. The drilling fluid outflow channel 404 of the support assembly is connected, so that the upper torsion support assembly 3a moves downward, and the upper torsion support assembly 3a and the lower torsion support assembly 3b move closer to each other. At this time, the upper torsion support assembly 3a moves to the bottom end of the total stroke. As the drilling progresses, the central spline tube 1 moves downward, and the upper torsion support assembly 3a approaches the upper end of the total stroke to reach the initial state position, repeat The technical effect of moving while drilling can be achieved by performing the second to eighth steps.

When the torsion support system while drilling breaks down during work, in order to prevent the protruding upper support block 309a or lower support block 309b from getting stuck when the drill is pulled out, the power supply can be cut off. At this time, the upper return piston cylinder water channel 401 communicates with the drilling fluid outflow channel of the upper torsion support assembly through the upper hydraulic system 202a, the lower return piston cylinder water channel 414 communicates with the drilling fluid outflow channel 410 of the lower torsion support assembly through the lower hydraulic system 202b, and the upper camshaft 308a is pushed by the upper return spring 311a, so that the upper end slot of the upper camshaft 308a engages with the upper end cover 312a slot, and the lower camshaft 308b is pushed by the lower return spring 311b, so that the lower end chute of the lower camshaft 308b engages with the lower end cover 312b chute Make the upper camshaft 308a and the lower camshaft 308b return to the initial position, and the upper support block 309a and the lower support block 309b are retracted into the device through the upper elastic member and the lower elastic member 507 ;

In summary, the anti-torsion support device uses the fluid pressure difference inside and outside the coiled tubing as the driving force, and uses the electronically controlled hydraulic assembly 2 to control the movement of the rotating mechanism, thereby driving the support mechanism 304 to expand in the radial direction, so that the support mechanism 304 is in close contact Drilling the well wall is beneficial to transmit the reaction torque generated by the downhole power drilling tool to the well wall, which reduces the alternating torsional force on the coiled tubing during drilling and reduces the frequency of coiled tubing replacement; no electric pump is required to provide driving force , reduce the load of the coiled tubing built-in cable while compressing the manufacturing cost, and avoid the failure caused by the inability to effectively dissipate heat due to the excessive power load in the downhole high temperature and high pressure environment; the design is based on the return spring 311 and the first clamping structure , The power-off protection mechanism based on the second clamping structure, on the one hand, can ensure the stable operation of the device, and on the other hand, even if the power is off, the support mechanism can be automatically retracted, so as to prevent the drill from sticking, and the operation is more convenient; the anti-torsion support while drilling The system is alternately supported on the drilling well wall through the upper and lower torsional support assemblies, and cooperates with the telescopic movement of the telescopic mechanism assembly, which not only meets the role of torque resistance, but also realizes the movement of the support system while drilling. It has complete functions and can It is suitable for various downhole operations such as drilling, completion and workover of deep and ultra-deep wells.

What is disclosed above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of rights of the present invention. Those of ordinary skill in the art can understand all or part of the process of realizing the above embodiments, and according to the rights of the present invention The equivalent changes required still belong to the scope covered by the invention.

Claims (10)

1. The utility model provides a antitorque strutting arrangement in coiled tubing drilling pit which characterized in that: the drilling fluid anti-torsion device comprises a central spline pipe (1) for the circulation of drilling high-pressure fluid, wherein a cylindrical electric control hydraulic assembly (2) and an anti-torsion support assembly (3) are sleeved on the central spline pipe (1) through splines; the anti-torsion support assembly (3) comprises a support groove drum (301) and an installation cylinder drum (302), a first chamber is reserved between the support groove drum (301) and the central spline pipe (1), a support mechanism (304) is arranged in the first chamber, a second chamber is reserved between the installation cylinder drum (302) and the central spline pipe (1), and a rotating mechanism (306) is arranged in the second chamber; wherein: the electric control hydraulic assembly (2) is used for controlling the rotating mechanism (306) to drive the supporting mechanism (304) to radially expand or retract so as to close or cut off torque transmission between the anti-torque supporting device and the wall of the well drilling well.

2. The coiled tubing drilling downhole anti-torque support device of claim 1, wherein: the supporting mechanism (304) comprises a camshaft (308) and a plurality of supporting blocks (309) arranged around the periphery of the camshaft (308), and an elastic part (307) is connected between every two adjacent supporting blocks (309); when the camshaft (308) rotates, the support blocks (309) can be radially extended and retracted through the corresponding notches (310) of the support groove drum (301).

3. The coiled tubing drilling downhole anti-torque support device of claim 2, wherein: the cam shaft (308) is supported at the bottom of the supporting groove barrel (301) through a return spring (311), a return cylinder barrel (303) is further arranged on the supporting groove barrel (301), an end cover (312) is sealed at the top of the return cylinder barrel (303), and a first clamping structure capable of opening and closing is further arranged between the end cover (312) and the cam shaft (308).

4. The coiled tubing drilling downhole anti-torque support device of claim 3, wherein: the rotating mechanism (306) comprises a helical spline shaft (315) and a helical spline barrel (316) arranged below the helical spline shaft (315), and when the helical spline barrel (316) moves axially, the helical spline shaft (315) can rotate forwards or backwards; and a second clamping structure capable of being opened and closed is further arranged between the inclined spline shaft (315) and the cam shaft (308), and when the second clamping structure is in a meshing state, the cam shaft (308) can rotate along with the rotation of the inclined spline shaft (315).

5. The coiled tubing drilling downhole anti-torque support device of claim 4, wherein: a third cavity is reserved between the return cylinder barrel (303) and the central spline tube (1), a return piston cylinder (313) is formed in the third cavity, and a return piston rod (314) connected with the camshaft (308) is arranged in the return piston cylinder (313); automatically controlled hydraulic drive assembly (2) can control return piston rod (314) drive camshaft (308) are along axial displacement to realize opening and shutting of first joint structure or second joint structure.

6. The coiled tubing drilling downhole anti-torque support device of claim 5, wherein: the electric control hydraulic assembly is characterized in that a driving cylinder barrel (305) is arranged at the bottom of the mounting cylinder barrel (302), a fourth cavity is reserved between the driving cylinder barrel (305) and the central spline tube (1), a driving piston cylinder (317) is formed in the fourth cavity, a driving piston rod (318) connected with the oblique spline barrel (316) is arranged in the driving piston cylinder (317), and the electric control hydraulic assembly (2) can control the driving piston rod (318) to drive the oblique spline barrel (316) to move axially.

7. The coiled tubing drilling downhole anti-torque support device of claim 6, wherein: the antitorque support assembly (3) further comprises a volume compensation mechanism (319), the volume compensation mechanism (319) dynamically balancing the pressures of the first, second, third and fourth chambers in conjunction with the action of the return piston rod (314) and drive piston rod (318); wherein: the volume compensation mechanism (319) comprises a volume compensation cylinder (320), a dynamic compensation piston (321) is further arranged in the volume compensation cylinder (320), and a drilling fluid through hole communicated with the anti-torsion supporting device is further formed in the cylinder wall of the volume compensation cylinder (320).

8. The coiled tubing drilling downhole anti-torque support device of claim 7, wherein: the electric control hydraulic assembly (2) comprises an electric control system (201) and a hydraulic system (202), the hydraulic system (202) comprises a drilling fluid circulation channel communicated with a tube cavity of the central spline tube (1) and an annulus of the anti-torsion supporting device, and a valve assembly is arranged in the drilling fluid circulation channel; wherein: the power control system (201) can control the axial movement of the return piston rod (314) and the drive piston rod (318) by utilizing the fluid pressure difference between the two sides of the piston by switching the valve positions of the valve assembly.

9. An anti-torque while drilling support system, characterized in that: the anti-torsion support device comprises an upper joint (4) used for connecting a coiled tubing or a weighted drill pipe and a lower joint (5) used for connecting a drilling tool, wherein an upper anti-torsion support device and a lower anti-torsion support device according to any one of claims 1-8 are oppositely arranged between the upper joint (4) and the lower joint (5), and the two anti-torsion support devices are connected through a telescopic mechanism assembly (6).

10. The while drilling anti-torque support system of claim 9, wherein: the central spline tube of the upper and lower anti-torsion supporting devices is shared, and the anti-torsion supporting assemblies of the upper and lower anti-torsion supporting devices can axially slide on the central spline tube; wherein: the telescopic mechanism assembly (6) comprises a telescopic cylinder barrel (601) connected with a higher-level anti-torsion support assembly (3 a), a telescopic piston rod (602) connected with a lower-level support assembly (3 b) is arranged in the telescopic cylinder barrel (601), and the telescopic piston rod (602) is controlled by an electric control hydraulic assembly of the higher-level anti-torsion support device.

Images