Wellhead hydraulic anchor matched with abrasive jet cutting system, anchoring system and using method

Abstract

The invention relates to a wellhead hydraulic anchor matched with an abrasive jet cutting system, an anchoring system and a using method. The wellhead hydraulic anchor comprises a body, a piston unit, an oil pipe and a plurality of anchor flukes. A rotating channel is defined by the body, a plurality of grooves are formed in the bottom end of the body and communicate with the rotating channel, the top ends of the anchor flukes are inserted into the grooves, the anchor flukes are detachably connected with the body through rotating shafts, and the anchor flukes can rotate relative to the body. The piston unit is inserted into the rotating channel, the piston unit can slide along the rotating channel, and the inner side wall of the anchor fluke is used for making contact with the peripheral wall close to the bottom end of the piston unit; the oil pipe penetrates through the cavity of the piston unit; the using process comprises anchoring and unanchoring. The anchor fluke slides along the rotating channel by means of the piston unit when the anchor fluke stretches and retracts, the risk that the anchor fluke is stuck by sand caused by solid particles is avoided, therefore, the cutting working condition is improved, and the phenomenon of cutting'wavy lines' is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of anchoring devices, and in particular to a wellhead hydraulic anchor, an anchoring system and a usage method for a abrasive jet cutting system. Background Art

[0002] At present, during the cutting operation of abandoned offshore oil production wells using abrasive jets, it is required that multiple nozzles on the cutting head cut along the radial direction of the wellbore to form a continuous planar cut. During on-site operations, a plunger pump such as a fracturing truck is generally used to boost the abrasive slurry, and then it is transported to the nozzles through a tubing. The pressure fluctuation of the plunger pump and the vibration of the tubing will cause it to be difficult for multiple nozzles to cut a planar slit on the wellbore, but instead form a "wavy line", which will greatly reduce the working efficiency of the abrasive jet cutting system and even lead to cutting failure. To address the above problems, a downhole hydraulic anchoring device is used in conjunction with the abrasive jet wellbore cutting system, which can effectively solve the problem of cutting "wavy lines".

[0003] However, when the cutting position where the nozzle is located is far from the wellhead, there is still a certain risk relying solely on the downhole hydraulic anchoring device: when the length of the tubing is very long (i.e., the cutting position depth is large), its weight is also very large, and the inertial force caused by the flexible rotation of the tubing due to pressure fluctuation can exceed the anchoring force of the downhole hydraulic anchoring device, still resulting in the occurrence of the cutting "wavy line" phenomenon. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a wellhead hydraulic anchor, an anchoring system and a usage method for a abrasive jet cutting system, and its advantage is that it can improve the cutting working condition and avoid the occurrence of the cutting "wavy line" phenomenon.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions: On the one hand, the present invention provides a wellhead hydraulic anchor for an abrasive jet cutting system, including a body, a piston unit, a tubing, and a plurality of anchor claws; the body encloses a rotating channel, a plurality of grooves are opened at the bottom end of the body, the plurality of grooves are arranged at intervals around the circumference of the body, the grooves are communicated with the rotating channel, the grooves are arranged in one-to-one correspondence with the anchor claws, the top end of the anchor claw is inserted into the groove, the anchor claw is detachably connected to the body through a rotating shaft, and the anchor claw can rotate relative to the body; the piston unit is inserted into the rotating channel, the piston unit can slide along the rotating channel, the inner side wall of the anchor claw is used to contact the outer peripheral wall near the bottom end of the piston unit, the outer side wall of the anchor claw is used to abut against the inner peripheral wall of the casing in the well to be cut, the piston unit slides along the rotating channel, and the sliding of the piston unit can drive the anchor claw to rotate to achieve the anchoring or de-anchoring of the well to be cut; the tubing is inserted into the cavity of the piston unit, and high-pressure abrasive slurry enters the downhole cutting nozzle through the tubing.

[0006] Preferably, for the wellhead hydraulic anchor for an abrasive jet cutting system provided by the present invention, the piston unit and the inner peripheral wall of the rotating channel form a first annular hydraulic cavity and a second annular hydraulic cavity, the first annular hydraulic cavity and the second annular hydraulic cavity are arranged at intervals, the first annular hydraulic cavity is communicated with a first liquid flow port opened on the body, the second annular hydraulic cavity is communicated with a second liquid flow port opened on the body, an annular space is formed between the inner peripheral wall of the piston unit and the outer peripheral wall of the tubing, and cutting fluid enters the downhole through the annular space; when hydraulic oil is input into the second annular hydraulic cavity through the second liquid flow port, the piston unit slides upward along the rotating channel under the thrust of the hydraulic oil, the piston unit pushes the anchor claw to rotate, and the anchor claw opens to achieve the anchoring of the well to be cut; when hydraulic oil is input into the first annular hydraulic cavity through the first liquid flow port, the piston unit slides downward along the rotating channel under the thrust of the hydraulic oil, the anchor claw rotates under its own gravity, and the anchor claw retracts to achieve the de-anchoring of the well to be cut.

[0007] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor, the main body includes a shell and a sealing cover, the shell is arranged to enclose the rotating channel, a plurality of grooves are opened at the bottom end of the shell, and the plurality of grooves are arranged at intervals around the circumference of the shell; the sealing cover is inserted into the top end of the rotating channel, the sealing cover is sealed with the shell, the sealing cover, the piston unit and the inner circumferential wall of the rotating channel together constitute the first annular hydraulic cavity; the first liquid flow port and the second liquid flow port are opened on the outer circumferential wall near the top end of the shell, the first liquid flow port and the second liquid flow port both extend along the radial direction of the rotating channel, and the first liquid flow port and the second liquid flow port are arranged at intervals.

[0008] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor, and the piston unit includes a piston tube and a piston cone tube. An external thread is provided on the outer circumferential wall near the bottom end of the piston tube, and an internal thread matching the external thread is provided on the inner circumferential wall of the small diameter end of the piston cone tube. The small diameter end of the piston cone tube is sleeved on the bottom end of the piston tube, and the piston cone tube is threadedly connected to the piston tube.

[0009] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor, and a force-bearing flange is provided on the outer peripheral wall of the piston tube near the top end, and the force-bearing flange extends outward in a direction perpendicular to the center line of the piston tube, and the outer peripheral wall of the force-bearing flange is in sealing contact with the inner peripheral wall of the rotating channel, and the force-bearing flange can slide along the rotating channel; a first stop flange is provided at the top end of the force-bearing flange, and a second stop flange is provided at the bottom end of the force-bearing flange, and the first stop flange and the second stop flange are used to limit the piston rod.

[0010] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor, and the anchor claw includes a connecting part, a first contact part and a second contact part, the bottom end of the connecting part is connected to the top end of the first contact part through an inclined plate, and the end of the first contact part facing away from the connecting part is connected to the top end of the second contact part; the inner side of the first contact part is provided with an inclined surface for contacting the cone part of the piston cone tube; the outer side of the second contact part is provided with an arc surface for contacting the inner circumferential wall of the casing of the wellbore to be cut.

[0011] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor, and a plurality of teeth are arranged on the arc surface.

[0012] Preferably, the abrasive jet cutting system provided by the present invention is equipped with a wellhead hydraulic anchor. A plurality of return water grooves are opened at the bottom end of the housing. The plurality of return water grooves are all communicated with the rotary channel. The return water grooves and the grooves are arranged alternately. The return water grooves are used to provide an upward return space for the cutting fluid in the annular space.

[0013] On the one hand, the present invention provides an anchoring system, including a hydraulic controller, a first high-pressure ball valve, a second high-pressure ball valve, and the wellhead hydraulic anchor supporting the abrasive jet cutting system as described above. The hydraulic controller is connected to the second hydraulic pipeline and the wellhead hydraulic anchor through the first hydraulic pipeline. The first high-pressure ball valve is arranged on the first hydraulic pipeline, and the second high-pressure ball valve is arranged on the second hydraulic pipeline. When the wellhead hydraulic anchor anchors the wellbore to be cut, the hydraulic controller transports hydraulic oil to the wellhead hydraulic anchor through the second high-pressure ball valve, and part of the hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the first high-pressure ball valve. When the wellhead hydraulic anchor is released from anchoring, the hydraulic controller transports hydraulic oil to the wellhead hydraulic anchor through the first high-pressure ball valve, and part of the hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the second high-pressure ball valve.

[0014] On the other hand, the present invention provides a usage method of the above-mentioned anchoring system, including the following steps:

[0015] Place the wellhead hydraulic anchor into the wellbore to be cut, open the hydraulic controller, the first high-pressure ball valve, and the second high-pressure ball valve. High-pressure hydraulic oil enters the wellhead hydraulic anchor through the second high-pressure ball valve to push the piston unit to slide upward. The anchor claws open, and the outer side walls of the anchor claws abut against the inner peripheral wall of the casing in the wellbore to be cut, realizing the anchoring function. The low-pressure hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the first high-pressure ball valve.

[0016] After cutting is completed, high-pressure hydraulic oil enters the wellhead hydraulic anchor through the first high-pressure ball valve to push the piston unit to slide downward. The anchor claws retract under the action of their own gravity, realizing release from anchoring. The low-pressure hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the second high-pressure ball valve.

[0017] In summary, the beneficial technical effects of the present invention are as follows: The abrasive jet cutting system provided in this application is equipped with a wellhead hydraulic anchor, an anchoring system and its usage method. The anchoring system includes a hydraulic controller, a first high-pressure ball valve, a second high-pressure ball valve, and a wellhead hydraulic anchor for the abrasive jet cutting system. The hydraulic controller is connected to the second hydraulic pipeline and the wellhead hydraulic anchor through the first hydraulic pipeline. The first high-pressure ball valve is arranged on the first hydraulic pipeline, and the second high-pressure ball valve is arranged on the second hydraulic pipeline. The wellhead hydraulic anchor includes a body, a piston unit, a tubing, and multiple anchor claws. The body encloses a rotating channel. A plurality of grooves are opened at the bottom end of the body. The plurality of grooves are arranged at intervals around the circumference of the body. The grooves communicate with the rotating channel. The grooves are arranged in one-to-one correspondence with the anchor claws. The top end of the anchor claw is inserted into the groove. The anchor claw is detachably connected to the body through a rotating shaft, and the anchor claw can rotate relative to the body. The piston unit is inserted into the rotating channel, and the piston unit can slide along the rotating channel. The inner side wall of the anchor claw is used to contact the outer peripheral wall near the bottom end of the piston unit, and the outer side wall of the anchor claw is used to abut against the inner peripheral wall of the casing in the wellbore to be cut. The piston unit slides along the rotating channel, and the sliding of the piston unit can drive the anchor claw to rotate to achieve the anchoring or unanchoring of the wellbore to be cut. The tubing passes through the cavity of the piston unit, and the high-pressure abrasive slurry enters the downhole cutting nozzle through the tubing. The usage process is: anchoring - unanchoring. On the one hand, by setting the detachable connection between the anchor claw and the body, different sizes of anchor claws can be replaced according to the anchoring requirements of wellbores to be cut with different inner diameters. Thus, the applicability is improved. On the other hand, by setting the opening and retraction of the anchor claw depending on the sliding of the piston unit along the rotating channel, the risk of sand jamming of the anchor claw caused by solid particles is avoided. Thus, the cutting working condition is improved, and the occurrence of the "wavy line" phenomenon during cutting is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of a wellhead hydraulic anchor for an abrasive jet cutting system provided in the first embodiment of the present invention.

[0019] Figure 2 FIG. is a cross-sectional view of a wellhead hydraulic anchor for an abrasive jet cutting system provided in the first embodiment of the present invention.

[0020] Figure 3 FIG. is a cross-sectional view of a wellhead hydraulic anchor for an abrasive jet cutting system provided in the first embodiment of the present invention in the anchored state.

[0021] Figure 4 FIG. is a schematic diagram of the structure of the body in a wellhead hydraulic anchor for an abrasive jet cutting system provided in the first embodiment of the present invention.

[0022] Figure 5 FIG. is a schematic diagram of the structure of the anchor claw in a wellhead hydraulic anchor for an abrasive jet cutting system provided in the first embodiment of the present invention.

[0023] Figure 6 is Figure 5 The enlarged view of A in

[0024] Figure 7 It is the top view of the second contact part in the wellhead hydraulic anchor matching the abrasive jet cutting system provided by the first embodiment of the present invention.

[0025] Figure 8 It is the schematic structural view of the anchoring system provided by the second embodiment of the present invention.

[0026] Figure 9 It is the flowchart of the usage of the anchoring system provided by the third embodiment of the present invention.

[0027] In the figure, 1 is the anchoring system; 10 is the hydraulic controller; 11 is the first hydraulic pipeline; 12 is the second hydraulic pipeline; 20 is the first high-pressure ball valve; 30 is the second high-pressure ball valve; 40 is the wellhead hydraulic anchor; 41 is the body; 411 is the housing; 4111 is the groove; 4112 is the return water groove; 4113 is the first liquid flow port; 4114 is the second liquid flow port; 4115 is the first cylinder body; 4116 is the second cylinder body; 4117 is the frustum-shaped cylinder body; 4118 is the limiting flange; 4119 is the flange; 4120 is the connecting hole; 4121 is the rotating channel; 412 is the sealing cover; 42 is the piston unit; 421 is the piston tube; 4211 is the stress flange; 4212 is the first stop flange; 4213 is the second stop flange; 422 is the piston cone tube; 4221 is the cone part; 4222 is the straight tube part; 43 is the oil pipe; 44 is the anchor claw; 441 is the connecting part; 442 is the first contact part; 4421 is the inclined surface; 443 is the second contact part; 4431 is the arc surface; 4432 is the tooth; 45 is the first annular hydraulic cavity; 46 is the second annular hydraulic cavity; 47 is the annular space; 48 is the rotating shaft. Detailed implementation manners

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] First embodiment:

[0030] A wellhead hydraulic anchor 40 matching the abrasive jet cutting system disclosed by the present invention needs to be used in cooperation with the downhole hydraulic anchor during the abrasive jet cutting of a large-depth wellbore, upgrading the downhole "single-point anchoring" to downhole and wellhead "double-point anchoring", improving the cutting working condition, and ensuring the smooth progress of cutting.

[0031] Refer to Figures 1 to 3, a wellhead hydraulic anchor 40 supporting an abrasive jet cutting system disclosed in the present invention, includes a body 41, a piston unit 42, a tubing 43, and a plurality of anchor claws 44; the body 41 encloses a rotating channel 4121, and a plurality of grooves 4111 are opened at the bottom end of the body 41. The plurality of grooves 4111 are arranged at intervals around the circumference of the body 41. The grooves 4111 communicate with the rotating channel 4121, and the grooves 4111 are arranged in one-to-one correspondence with the anchor claws 44. The top end of the anchor claw 44 is inserted into the groove 4111, and the anchor claw 44 is detachably connected to the body 41 through a rotating shaft 48. The anchor claw 44 can rotate relative to the body 41; by providing that the anchor claw 44 is detachably connected to the body 41, different sizes of anchor claws 44 can be replaced according to the anchoring requirements of the wellbore to be cut with different inner diameters. Thus, the applicability is improved.

[0032] Specifically, the plurality of grooves 4111 extend along the central axis direction of the rotating channel 4121. The central axis of the rotating shaft 48 is perpendicular to the central axis of the rotating channel 4121, and the anchor claw 44 rotates about the central axis of the rotating shaft 48.

[0033] Among them, the piston unit 42 is inserted into the rotating channel 4121. The piston unit 42 can slide along the rotating channel 4121. The inner side wall of the anchor claw 44 is used to contact the outer peripheral wall near the bottom end of the piston unit 42, and the outer side wall of the anchor claw 44 is used to abut against the inner peripheral wall of the casing in the wellbore to be cut. The piston unit 42 slides along the rotating channel 4121, and the sliding of the piston unit 42 can drive the anchor claw 44 to rotate to achieve the anchoring or de-anchoring of the wellbore to be cut; the tubing 43 penetrates through the cavity of the piston unit 42, and the high-pressure abrasive slurry enters the downhole cutting nozzle through the tubing 43; on the one hand, by providing that the opening and retraction of the anchor claw 44 rely on the sliding of the piston unit 42 along the rotating channel 4121, the risk of sand jamming of the anchor claw 44 caused by solid particles is avoided. Thus, the cutting working condition is improved, and the occurrence of the "wavy line" phenomenon during cutting is avoided; on the other hand, the tubing 43 has no interference with the opening and retraction of the anchor claw 44, and there is no need to consider the influence of the size, length, rotation speed, etc. of the tubing 43 on the working effect of the wellhead hydraulic anchor 40.

[0034] Specifically, the extending direction of the piston unit 42 is parallel to the central axis of the rotating channel 4121, and the central axis of the tubing 43 is parallel to the central axis of the rotating channel 4121. In some realizable ways, the central axis of the tubing 43 coincides with the central axis of the rotating channel 4121.

[0035] It should be noted that the number of the anchor claws 44 is basically the same as the number of the grooves 4111.

[0036] Among them, the wellhead hydraulic anchor 40 provided in this embodiment may include four anchor claws 44, five anchor claws 44, six anchor claws 44, or seven anchor claws 44, etc.

[0037] In an implementable manner where the wellhead hydraulic anchor 40 includes four anchor claws 44, four grooves 4111 are provided at the bottom end of the body 41. The four grooves 4111 are arranged at intervals around the circumference of the body 41. The four grooves 4111 all extend upward along the center line direction of the rotation channel 4121. The grooves 4111 are arranged in one-to-one correspondence with the anchor claws 44, and the four anchor claws 44 are evenly distributed in the four grooves 4111.

[0038] During use, the top end of the body 41 is connected to an external wellhead rotating device by bolt connection. The high-pressure abrasive slurry in the wellhead rotating device enters the downhole cutting nozzle through the oil pipe 43.

[0039] The usage process of the abrasive jet cutting system provided in this embodiment with the wellhead hydraulic anchor 40 is as follows: The wellhead hydraulic anchor 40 is placed into the wellbore to be cut. The piston unit 42 slides upward along the rotation channel 4121. The piston unit 42 pushes the anchor claws 44 to rotate outward, so that the anchor claws 44 open. At this time, the anchor claws 44 are in contact with the inner peripheral wall of the casing to achieve the anchoring of the wellbore to be cut. After cutting is completed, the piston unit 42 slides downward along the rotation channel 4121 to release the pushing force of the piston unit 42 on the anchor claws 44. The anchor claws 44 retract under the action of their own gravity to complete the unlocking.

[0040] Furthermore, in this embodiment, the piston unit 42 and the inner peripheral wall of the rotation channel 4121 form a first annular hydraulic cavity 45 and a second annular hydraulic cavity 46. The first annular hydraulic cavity 45 and the second annular hydraulic cavity 46 are arranged at intervals. The first annular hydraulic cavity 45 is communicated with a first liquid flow port 4113 provided on the body 41. The second annular hydraulic cavity 46 is communicated with a second liquid flow port 4114 provided on the body 41. An annular space 47 is formed between the inner peripheral wall of the piston unit 42 and the outer peripheral wall of the oil pipe 43. The cutting fluid enters the downhole through the annular space 47. When hydraulic oil is input into the second annular hydraulic cavity 46 through the second liquid flow port 4114, the piston unit 42 slides upward along the rotation channel 4121 under the thrust of the hydraulic oil. The piston unit 42 pushes the anchor claws 44 to rotate, and the anchor claws 44 open to achieve the anchoring of the wellbore to be cut. When hydraulic oil is input into the first annular hydraulic cavity 45 through the first liquid flow port 4113, the piston unit 42 slides downward along the rotation channel 4121 under the thrust of the hydraulic oil. The anchor claws 44 rotate under the action of their own gravity, and the anchor claws 44 retract to achieve the unlocking of the wellbore to be cut. By setting the first annular hydraulic cavity 45, the second annular hydraulic cavity 46 to be isolated from the high-pressure abrasive slurry in the oil pipe 43 and the cutting fluid in the annular space 47, the opening and retraction of the anchor claws 44 are realized by the hydraulic oil pushing the piston unit 42, avoiding the risk of sand jamming of the anchor claws 44 caused by solid particles. Thus, the cutting working condition is improved, and the occurrence of the "wavy line" phenomenon during cutting is avoided.

[0041] Specifically, a first liquid flow port 4113 and a second liquid flow port 4114 are provided on the outer peripheral wall near the top end of the main body 41. Both the first liquid flow port 4113 and the second liquid flow port 4114 extend along the radial direction of the rotation channel 4121. The first liquid flow port 4113 and the second liquid flow port 4114 are arranged at intervals so as to Figure 2 Taking the shown orientation as an example, the first liquid flow port 4113 is located above the second liquid flow port 4114, and the first annular hydraulic cavity 45 is located above the second annular hydraulic cavity 46.

[0042] It should be noted that before use, it is necessary to inject oil and exhaust air into the first annular hydraulic cavity 45 and the second annular hydraulic cavity 46 first.

[0043] Continue to refer to Figures 1 to 4 , in this embodiment, the main body 41 includes a housing 411 and a sealing cover 412. The housing 411 encloses a rotation channel 4121. A plurality of grooves 4111 are provided at the bottom end of the housing 411. The plurality of grooves 4111 are arranged at intervals around the circumferential direction of the housing 411. The sealing cover 412 is inserted into the top end of the rotation channel 4121. The sealing cover 412 is hermetically connected to the housing 411. The sealing cover 412, the piston unit 42 and the inner peripheral wall of the rotation channel 4121 together form a first annular hydraulic cavity 45. A first liquid flow port 4113 and a second liquid flow port 4114 are provided on the outer peripheral wall near the top end of the housing 411. Both the first liquid flow port 4113 and the second liquid flow port 4114 extend along the radial direction of the rotation channel 4121. The first liquid flow port 4113 and the second liquid flow port 4114 are arranged at intervals. The first liquid flow port 4113 is used to inject hydraulic oil into the first annular hydraulic cavity 45, and the second liquid flow port 4114 is used to inject hydraulic oil into the second annular hydraulic cavity 46.

[0044] In order to prevent the hydraulic oil in the first annular hydraulic cavity 45 from leaking, the sealing cover 412 is hermetically connected to the housing 411 through a sealing ring.

[0045] Exemplarily, the sealing cover 412 is annular. Of course, the sealing cover 412 can also be a cylinder provided with through holes. In an implementable manner where the sealing cover 412 is annular, the center line of the sealing cover 412 is arranged parallel to the center line of the rotation channel 4121. In some implementable manners, the center line of the sealing cover 412 is collinear with the center line of the rotation space.

[0046] During use, the piston unit 42 is inserted into the rotation channel 4121, and the top end of the piston unit 42 is inserted into the sealing cover 412. The piston unit 42 can slide relative to the sealing cover 412.

[0047] Further, the housing 411 includes a first cylinder 4115, a second cylinder 4116, and a frustum-shaped cylinder 4117. The bottom end of the first cylinder 4115 is connected to the top end of the second cylinder 4116. One end of the second cylinder 4116 facing away from the first cylinder 4115 is connected to the large-diameter end of the frustum-shaped cylinder 4117. The cavity of the first cylinder 4115 is communicated with the cavity of the frustum-shaped cylinder 4117 through the cavity of the second cylinder 4116. The cavity of the first cylinder 4115, the cavity of the second cylinder 4116, and the cavity of the frustum-shaped cylinder 4117 together form a rotating channel 4121. Among them, the outer diameter of the first cylinder 4115 is greater than the outer diameter of the second cylinder 4116. The outer diameter of the second cylinder 4116 is the same as the outer diameter of the large-diameter end of the frustum-shaped cylinder 4117. The inner diameter of the second cylinder 4116 is the same as the inner diameter of the frustum-shaped cylinder 4117.

[0048] Specifically, the inner diameter of the first cylinder 4115 is greater than the inner diameter of the second cylinder 4116. A limiting flange 4118 is provided on the inner peripheral wall of one end of the first cylinder 4115 facing the second cylinder 4116. The limiting flange 4118 extends radially inward along the first cylinder 4115. Among them, the inner diameter of the limiting flange 4118 is the same as the inner diameter of the second cylinder 4116. That is to say, the diameter of the cavity surrounded by the limiting flange 4118 is the same as the diameter of the cavity of the second cylinder 4116.

[0049] Among them, the groove 4111 is opened at the small-diameter end of the frustum-shaped cylinder 4117 and extends along the center line direction of the rotating channel 4121 to the second cylinder 4116.

[0050] In order to facilitate the connection with an external wellhead rotating device, a flange 4119 is provided on the outer peripheral wall of one end of the first cylinder 4115 facing away from the second cylinder 4116. A plurality of connection holes 4120 are opened on the flange 4119. The plurality of connection holes 4120 are arranged at intervals around the circumference of the flange 4119. The body 41 is connected to the wellhead rotating device through connection bolts.

[0051] Specifically, both the first fluid port 4113 and the second fluid port 4114 are opened on the outer peripheral wall of the first cylinder 4115. Both the first fluid port 4113 and the second fluid port 4114 are communicated with the cavity of the first cylinder 4115.

[0052] It should be noted that taking Figure 2 the shown orientation as an example, the second fluid port 4114 is located above the limiting flange 4118.

[0053] Further, in this embodiment, a plurality of return water grooves 4112 are formed at the bottom end of the housing 411. The plurality of return water grooves 4112 communicate with the rotary channel 4121, and the return water grooves 4112 and the grooves 4111 are arranged alternately; the return water grooves 4112 are used to provide an upward return space for the cutting fluid in the annular space 47.

[0054] Specifically, a plurality of return water grooves 4112 are formed at the small-diameter end of the frustum-shaped cylinder 4117, and the plurality of return water grooves 4112 extend along the center line direction of the rotary channel 4121.

[0055] It should be noted that the width of the return water groove 4112 is greater than the width of the groove 4111.

[0056] Among them, four return water grooves 4112, five return water grooves 4112, six return water grooves 4112, etc. can be provided at the small-diameter end of the frustum-shaped cylinder 4117. In the implementable manner of providing four return water grooves 4112 at the small-diameter end of the frustum-shaped cylinder 4117, the return water grooves 4112 and the grooves 4111 are arranged alternately.

[0057] Further, in this embodiment, the piston unit 42 includes a piston tube 421 and a piston cone tube 422. An external thread is provided on the outer peripheral wall near the bottom end of the piston tube 421, and an internal thread adapted to the external thread is provided on the inner peripheral wall of the small-diameter end of the piston cone tube 422. The small-diameter end of the piston cone tube 422 is sleeved on the bottom end of the piston tube 421, and the piston cone tube 422 is threadedly connected to the piston tube 421.

[0058] Specifically, the center line of the piston tube 421 is parallel to the center line of the piston cone tube 422. In some implementable manners, the center line of the piston tube 421 and the center line of the piston cone tube 422 are collinear.

[0059] Among them, the piston cone tube 422 includes a cone portion 4221 and a straight cylinder portion 4222. The large-diameter end of the cone portion 4221 is connected to the top end of the straight cylinder portion 4222, and the small-diameter end of the cone portion 4221 is threadedly connected to the piston tube 421.

[0060] In this embodiment, the piston tube 421, the sealing cover 412, and the inner cavity wall of the first cylinder 4115 together form a first annular hydraulic cavity 45; the piston tube 421, the inner cavity wall of the first cylinder 4115, and the limit flange 4118 together form a second annular hydraulic cavity 46.

[0061] Further, in this embodiment, a force-bearing flange 4211 is provided on the outer peripheral wall of the piston tube 421 near the top end. The force-bearing flange 4211 extends outward along the direction perpendicular to the center line of the piston tube 421. The outer peripheral wall of the force-bearing flange 4211 is in sealing contact with the inner peripheral wall of the rotary channel 4121, and the force-bearing flange 4211 can slide along the rotary channel 4121;

[0062] A first stop flange 4212 is provided at the top of the force-bearing flange 4211, and a second stop flange 4213 is provided at the bottom of the force-bearing flange 4211. The first stop flange 4212 and the second stop flange 4213 are used to limit the piston rod.

[0063] It should be noted that the diameters of both the first stop flange 4212 and the second stop flange 4213 are smaller than the diameter of the force-bearing flange 4211.

[0064] Specifically, a first stop flange 4212 is provided on the outer peripheral wall of the piston tube 421. The first stop flange 4212 extends outward along a direction perpendicular to the central axis of the piston tube 421. The bottom end of the first stop flange 4212 is connected to the top end of the force-bearing flange 4211, and the top end of the first stop flange 4212 is used to contact the bottom end of the sealing cover 412. A second stop flange 4213 is provided on the outer peripheral wall of the piston tube 421. The second stop flange 4213 extends outward along a direction perpendicular to the central axis of the piston tube 421. The top end of the second stop flange 4213 is connected to the bottom end of the force-bearing flange 4211.

[0065] When the piston unit 42 is in the initial state, the bottom end of the second stop flange 4213 contacts the top end of the limit flange 4118.

[0066] It should be noted that Figure 2 Taking the shown orientation as an example, the first annular hydraulic cavity 45 is located above the force-bearing flange 4211, and the second annular hydraulic cavity 46 is located below the force-bearing flange 4211.

[0067] Among them, to prevent hydraulic oil leakage, the piston tube 421 is in sealing contact with the inner peripheral wall of the limit flange 4118 through a first sealing ring, and the force-bearing flange 4211 is in sealing contact with the inner peripheral wall of the first cylinder body 4115 through a second sealing ring.

[0068] The use process of the wellhead hydraulic anchor 40 of the abrasive jet cutting system provided in this embodiment is as follows: the wellhead hydraulic anchor 40 is placed in the wellbore to be cut, and the outer peripheral wall of the truncated cone-shaped cylinder 4117 contacts the inner peripheral wall of the casing so as to "pre-position" the wellhead hydraulic anchor 40; before the wellhead hydraulic anchor 40 is used, the first annular hydraulic cavity 45 and the second annular hydraulic cavity 46 need to be filled with oil and exhausted, and then hydraulic oil is input into the second annular hydraulic cavity 46 through the second liquid flow port 4114, and the pressure of the hydraulic oil is reduced. The piston tube 421 is pushed to move upward slowly by the force-bearing flange 4211, and the piston tube 421 drives the piston cone tube 422 to move upward, and the contact position of the piston cone tube 422 and the fluke 44 gradually moves upward, thereby pushing the fluke 44 to gradually open, and the fluke 44 is connected to the housing 411 through the rotating shaft 48. The opening mode of the fluke 44 is "fixed-axis rotation". When the outer side walls of all the flukes 44 are against the inner circumferential wall of the sleeve, the anchoring function is realized; at the same time, the hydraulic oil in the first annular hydraulic cavity 45 flows out through the first liquid flow port 4113. After the cutting is completed, hydraulic oil is input into the first annular hydraulic cavity 45 through the first liquid flow port 4113. Under the pressure of the hydraulic oil, the piston tube 421 is pushed to slowly move downward through the force-bearing flange 4211, and the piston tube 421 drives the piston cone tube 422 to move downward, thereby releasing the pushing force of the piston cone tube 422 on the anchor claw 44. The anchor claw 44 is gradually retracted under the action of its own gravity, and the anchor is released; at the same time, the hydraulic oil in the second annular hydraulic cavity 46 flows out through the second liquid flow port 4114.

[0069] Continue to refer to Figures 5 to 7 In this embodiment, the anchor claw 44 includes a connecting portion 441, a first contact portion 442 and a second contact portion 443. The bottom end of the connecting portion 441 is connected to the top end of the first contact portion 442 through an inclined plate, and the end of the first contact portion 442 away from the connecting portion 441 is connected to the top end of the second contact portion 443; the inner side of the first contact portion 442 is provided with an inclined surface 4421 for contacting the cone portion 4221 of the piston cone tube 422; the outer side of the second contact portion 443 is provided with an arc surface 4431 for contacting the inner circumferential wall of the casing of the wellbore to be cut.

[0070] It should be noted that the radius of the arc surface 4431 is equal to the inner radius of the sleeve.

[0071] Specifically, one end of the connecting portion 441 away from the first contact portion 442 is inserted into the groove 4111 and is rotatably connected to the housing 411 via the rotating shaft 48 .

[0072] Furthermore, in this embodiment, a plurality of teeth 4432 are provided on the arc surface 4431. Such a configuration improves the friction between the fluke 44 and the inner circumferential wall of the sleeve, ensuring that the contact between the fluke 44 and the inner circumferential wall of the sleeve has sufficient anti-axial movement capability.

[0073] Second Embodiment:

[0074] Continuing to refer to Figure 8 Figure, the second embodiment provides an anchoring system 1, including a hydraulic controller 10, a first high-pressure ball valve 20, a second high-pressure ball valve 30, and the wellhead hydraulic anchor 40 supporting the abrasive jet cutting system in the above first embodiment; the hydraulic controller 10 is connected to the second hydraulic pipeline 12 and the wellhead hydraulic anchor 40 through the first hydraulic pipeline 11, the first high-pressure ball valve 20 is arranged on the first hydraulic pipeline 11, and the second high-pressure ball valve 30 is arranged on the second hydraulic pipeline 12; when the wellhead hydraulic anchor 40 anchors the wellbore to be cut, the hydraulic controller 10 conveys hydraulic oil to the wellhead hydraulic anchor 40 through the second high-pressure ball valve 30, and part of the hydraulic oil in the wellhead hydraulic anchor 40 flows back into the hydraulic controller 10 through the first high-pressure ball valve 20;

[0075] When the wellhead hydraulic anchor 40 releases the anchor, the hydraulic controller 10 conveys hydraulic oil to the wellhead hydraulic anchor 40 through the first high-pressure ball valve 20, and part of the hydraulic oil in the wellhead hydraulic anchor 40 flows back into the hydraulic controller 10 through the second high-pressure ball valve 30.

[0076] Specifically, one end of the first hydraulic pipeline 11 is connected to the hydraulic controller 10, the other end of the first hydraulic pipeline 11 is communicated with the first liquid flow port 4113 through the first high-pressure ball valve 20, one end of the second hydraulic pipeline 12 is connected to the hydraulic controller 10, and the other end of the second hydraulic pipeline 12 is communicated with the second liquid flow port 4114 through the second high-pressure ball valve 30.

[0077] During use, the wellhead hydraulic anchor 40 after connection is placed inside the wellbore to be cut. During the lowering process, the outer peripheral wall of the frustum-shaped cylinder 4117 contacts the inner peripheral wall of the casing to "pre-position" the wellhead hydraulic anchor 40. Then, the hydraulic controller 10, the first high-pressure ball valve 20, and the second high-pressure ball valve 30 are opened. The hydraulic oil enters the second high-pressure ball valve 30 according to the preset pressure and then enters the second annular hydraulic cavity 46. The piston tube 421 slowly moves upward under the push of the hydraulic pressure. The piston tube 421 drives the piston cone tube to move upward. The contact position between the piston cone tube 422 and the inclined surface 4421 of the anchor claw 44 gradually moves upward, thereby pushing the anchor claw 44 to gradually open. The anchor claw 44 is connected to the housing 411 through the rotating shaft 48, and the opening method of the anchor claw 44 is "fixed-axis rotation". When the outer side walls of all the anchor claws 44 abut against the inner peripheral wall of the casing, the tooth part 4432 thereof will firmly press against the inner peripheral wall of the casing to achieve the anchoring function. The magnitude of the anchoring force can be adjusted by the hydraulic controller 10. During this process, the hydraulic oil in the first annular hydraulic cavity 45 flows back to the hydraulic controller 10 through the opened first high-pressure ball valve 20 to complete the closed-loop flow process. After the cutting operation is completed, the flow direction of the hydraulic oil in the hydraulic controller 10 is reversed by using the reversing mechanism in the hydraulic controller 10, that is, the high-pressure hydraulic oil will enter the first annular hydraulic cavity 45 through the first high-pressure ball valve 20. The hydraulic oil pushes the piston tube 421 to move downward, and the piston tube 421 drives the piston cone tube to move downward at the same time, thereby releasing the pushing force of the piston cone tube 422 on the anchor claw 44. The anchor claw 44 gradually retracts under the action of its own gravity to complete the anchor release. During this process, the low-pressure hydraulic oil in the second annular hydraulic cavity 46 flows back to the hydraulic controller 10 through the opened second high-pressure ball valve 30 to complete the closed-loop flow process.

[0078] The operation process of the pressure-holding function of the anchoring system 1 provided in this embodiment is as follows: According to the actual working condition requirements, if the wellhead hydraulic anchor 40 still needs to maintain the anchoring force after cutting is completed, so as to subsequently hoist the cut wellbore and the abrasive jet cutting system as a whole, after the high-pressure hydraulic oil enters the second annular hydraulic cavity 46, that is, after all the anchor claws 44 are opened and anchored to the casing, the first high-pressure ball valve 20 and the second high-pressure ball valve 30 are both closed, and the left sides of the first hydraulic pipeline 11 and the second hydraulic pipeline 12 are disconnected. Then, the first annular hydraulic cavity 45 and the second annular hydraulic cavity 46 form a completely closed hydraulic environment through the piston tube 421, and the anchor claws 44 cannot be retracted, that is, the anchoring force always exists. After the hoisting is completed, the first hydraulic pipe, the second hydraulic pipeline 12 and the hydraulic controller 10 are reconnected, and the first high-pressure ball valve 20 and the second high-pressure ball valve 30 are both opened. Then, the high-pressure hydraulic oil enters the second annular hydraulic cavity 46, and the high-pressure hydraulic oil pushes the piston unit 42 to move downward to complete the process of releasing the anchor.

[0079] Third Embodiment:

[0080] Continue to refer to Figure 9 , the third embodiment provides a usage method of the anchoring system 1 in the above second embodiment, including the following steps:

[0081] S101. Place the wellhead hydraulic anchor 40 into the wellbore to be cut. Open the hydraulic controller 10, the first high-pressure ball valve 20, and the second high-pressure ball valve 30. High-pressure hydraulic oil enters the wellhead hydraulic anchor 40 through the second high-pressure ball valve 30 to push the piston unit 42 to slide upward. The anchor claws 44 open, and the outer sidewall of the anchor claws 44 abuts against the inner peripheral wall of the casing in the wellbore to be cut, realizing the anchoring function. The low-pressure hydraulic oil in the wellhead hydraulic anchor 40 flows back into the hydraulic controller 10 through the first high-pressure ball valve 20.

[0082] Specifically, after the connection of the wellhead hydraulic anchor 40 is completed, place it inside the wellbore to be cut. During the lowering process, the outer peripheral wall of the frustum-shaped cylinder 4117 contacts the inner peripheral wall of the casing to "pre-position" the wellhead hydraulic anchor 40.

[0083] Before using the wellhead hydraulic anchor 40, it is necessary to inject oil and exhaust air into the first annular hydraulic cavity 45 and the second annular hydraulic cavity 46 first.

[0084] Then turn on the hydraulic controller 10, the first high-pressure ball valve 20, and the second high-pressure ball valve 30. High-pressure hydraulic oil enters the second high-pressure ball valve 30 according to the preset pressure and then enters the second annular hydraulic cavity 46. The piston tube 421 slowly moves upward under the push of the hydraulic pressure. The piston tube 421 drives the piston cone tube to move upward. The contact position between the piston cone tube 422 and the inclined surface 4421 of the anchor claw 44 gradually moves upward, thereby pushing the anchor claw 44 to gradually open. The anchor claw 44 is connected to the housing 411 through the rotating shaft 48. The opening method of the anchor claw 44 is "fixed-axis rotation"; when the outer sidewalls of all the anchor claws 44 abut against the inner peripheral wall of the casing, the tooth part 4432 thereof will tightly press against the inner peripheral wall of the casing to realize the anchoring function. The magnitude of the anchoring force can be adjusted by the hydraulic controller 10. During this process, the low-pressure hydraulic oil in the first annular hydraulic cavity 45 flows back to the hydraulic controller 10 through the opened first high-pressure ball valve 20 to complete the closed-loop flow process.

[0085] S102. After cutting is completed, high-pressure hydraulic oil enters the wellhead hydraulic anchor 40 through the first high-pressure ball valve 20 to push the piston unit 42 to slide downward. The anchor claws 44 retract under their own gravity to realize unlocking. The low-pressure hydraulic oil in the wellhead hydraulic anchor 40 flows back into the hydraulic controller 10 through the second high-pressure ball valve 30.

[0086] Specifically, after the cutting operation is completed, the flow direction of the liquid in the hydraulic controller 10 is reversed by using the reversing mechanism in the hydraulic controller 10, that is, the high-pressure hydraulic oil will enter the first annular hydraulic cavity 45 through the first high-pressure ball valve 20. The hydraulic oil pushes the piston tube 421 to move downward, and the piston tube 421 drives the piston cone tube to move downward at the same time, thereby releasing the driving force of the piston cone tube 422 on the anchor claw 44. The anchor claw 44 gradually retracts under the action of its own gravity to complete the anchor release. During this process, the low-pressure hydraulic oil in the second annular hydraulic cavity 46 flows back to the hydraulic controller 10 through the opened second high-pressure ball valve 30 to complete the closed-loop flow process.

[0087] After S101 and before S102, it also includes that the seawater (i.e., cutting fluid) pumped in by the external forced liquid supplement and drainage assistance system enters the wellbore through the annular space 47. At the same time, the high-pressure abrasive slurry in the external wellhead rotating device enters the downhole cutting nozzle through the oil pipe 43.

[0088] Usage of the anchoring system 1 provided by the present application. The anchoring system 1 includes a hydraulic controller 10, a first high-pressure ball valve 20, a second high-pressure ball valve 30, and a wellhead hydraulic anchor 40 supporting an abrasive jet cutting system. The hydraulic controller 10 is connected to the second hydraulic pipeline 12 and the wellhead hydraulic anchor 40 through a first hydraulic pipeline 11. The first high-pressure ball valve 20 is arranged on the first hydraulic pipeline 11, and the second high-pressure ball valve 30 is arranged on the second hydraulic pipeline 12. The wellhead hydraulic anchor 40 includes a body 41, a piston unit 42, a tubing 43, and a plurality of anchor claws 44. The body 41 encloses a rotating channel 4121. A plurality of grooves 4111 are formed at the bottom end of the body 41. The plurality of grooves 4111 are arranged at intervals around the circumference of the body 41. The grooves 4111 communicate with the rotating channel 4121. The grooves 4111 are arranged in one-to-one correspondence with the anchor claws 44. The top end of the anchor claw 44 is inserted into the groove 4111. The anchor claw 44 is detachably connected to the body 41 through a rotating shaft 48. The anchor claw 44 can rotate relative to the body 41. The piston unit 42 is inserted into the rotating channel 4121. The piston unit 42 can slide along the rotating channel 4121. The inner side wall of the anchor claw 44 is used to contact the outer peripheral wall near the bottom end of the piston unit 42. The outer side wall of the anchor claw 44 is used to abut against the inner peripheral wall of the casing in the wellbore to be cut. The piston unit 42 slides along the rotating channel 4121, and the sliding of the piston unit 42 can drive the anchor claw 44 to rotate, so as to realize the anchoring or de-anchoring of the wellbore to be cut. The tubing 43 passes through the cavity of the piston unit 42, and the high-pressure abrasive slurry enters the downhole cutting nozzle through the tubing 43. The usage process is: anchoring - de-anchoring. On the one hand, by setting the detachable connection between the anchor claw 44 and the body 41, different sizes of anchor claws 44 can be replaced according to the anchoring requirements of wellbores to be cut with different inner diameters. Thus, the applicability is improved. On the other hand, by setting the opening and retraction of the anchor claw 44 depending on the sliding of the piston unit 42 along the rotating channel 4121, the risk of sand jamming of the anchor claw 44 caused by solid particles is avoided. Thus, the cutting working condition is improved, and the occurrence of the "wavy line" phenomenon during cutting is avoided.

[0089] The anchoring system 1 provided by the present invention has the following advantages: The magnitude of the anchoring force of the system can be flexibly adjusted by the pressure of the hydraulic oil, and the structure has high versatility.

[0090] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0091] Finally, it should be noted that: Obviously, the above embodiments are merely examples given for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaustively list all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A wellhead hydraulic anchor for an abrasive jet cutting system, Characterized in that: It includes a body, a piston unit, a tubing string, and a plurality of anchor claws; The body defines a rotating channel. A plurality of grooves are formed at the bottom end of the body. The plurality of grooves are arranged at intervals along the circumferential direction of the body. The grooves communicate with the rotating channel. The grooves are arranged in one-to-one correspondence with the anchor claws. The top end of the anchor claw is inserted into the groove. The anchor claw is detachably connected to the body through a rotating shaft, and the anchor claw can rotate relative to the body; The piston unit is inserted into the rotating channel. The piston unit can slide along the rotating channel. The inner side wall of the anchor claw is used to contact the outer peripheral wall near the bottom end of the piston unit. The outer side wall of the anchor claw is used to abut against the inner peripheral wall of the casing in the wellbore to be cut. The piston unit slides along the rotating channel, and the sliding of the piston unit can drive the anchor claw to rotate to achieve anchoring or unanchoring of the wellbore to be cut; The tubing string passes through the cavity of the piston unit, and high-pressure abrasive slurry enters the downhole cutting nozzle through the tubing string.

2. The wellhead hydraulic anchor for an abrasive jet cutting system according to claim 1, Characterized in that: The piston unit and the inner peripheral wall of the rotating channel form a first annular hydraulic cavity and a second annular hydraulic cavity. The first annular hydraulic cavity and the second annular hydraulic cavity are arranged at intervals. The first annular hydraulic cavity communicates with a first liquid flow port formed on the body. The second annular hydraulic cavity communicates with a second liquid flow port formed on the body. An annular space is formed between the inner peripheral wall of the piston unit and the outer peripheral wall of the tubing string, and cutting fluid enters the wellbore through the annular space; When hydraulic oil is input into the second annular hydraulic cavity through the second liquid flow port, the piston unit slides upward along the rotating channel under the thrust of the hydraulic oil. The piston unit pushes the anchor claw to rotate, and the anchor claw opens to achieve anchoring of the wellbore to be cut; when hydraulic oil is input into the first annular hydraulic cavity through the first liquid flow port, the piston unit slides downward along the rotating channel under the thrust of the hydraulic oil. The anchor claw rotates under its own gravity, and the anchor claw retracts to achieve unanchoring of the wellbore to be cut.

3. The wellhead hydraulic anchor for an abrasive jet cutting system according to claim 2, Characterized in that: The body includes a housing and a sealing cover. The housing defines the rotating channel. A plurality of the grooves are formed at the bottom end of the housing. The plurality of grooves are arranged at intervals along the circumferential direction of the housing; The sealing cover is inserted into the top end of the rotating channel. The sealing cover is hermetically connected to the housing. The sealing cover, the piston unit, and the inner peripheral wall of the rotating channel together form the first annular hydraulic cavity; The first liquid flow port and the second liquid flow port are formed on the outer peripheral wall near the top end of the housing. The first liquid flow port and the second liquid flow port both extend radially along the rotating channel. The first liquid flow port and the second liquid flow port are arranged at intervals.

4. The abrasive jet cutting system according to claim 1 is equipped with a wellhead hydraulic anchor. Features: The piston unit includes a piston tube and a piston cone tube. An external thread is provided on the outer circumferential wall near the bottom end of the piston tube, and an internal thread matching the external thread is provided on the inner circumferential wall of the small diameter end of the piston cone tube. The small diameter end of the piston cone tube is sleeved on the bottom end of the piston tube, and the piston cone tube is threadedly connected to the piston tube.

5. The abrasive jet cutting system according to claim 4 is equipped with a wellhead hydraulic anchor. Features: A force-bearing flange is provided on the outer peripheral wall of the piston tube near the top end, and the force-bearing flange extends outward in a direction perpendicular to the center line of the piston tube. The outer peripheral wall of the force-bearing flange is in sealing contact with the inner peripheral wall of the rotating channel, and the force-bearing flange can slide along the rotating channel; A first stop flange is arranged at the top end of the force-bearing flange, and a second stop flange is arranged at the bottom end of the force-bearing flange. The first stop flange and the second stop flange are used to limit the piston rod.

6. A wellhead hydraulic anchor for an abrasive jet cutting system according to any one of claims 4 to 5, Features: The fluke comprises a connecting portion, a first contact portion and a second contact portion, wherein the bottom end of the connecting portion is connected to the top end of the first contact portion through an inclined plate, and the end of the first contact portion facing away from the connecting portion is connected to the top end of the second contact portion; The inner side of the first contact portion is provided with an inclined surface for contacting the cone portion of the piston cone tube; The outer side of the second contact portion is provided with an arc surface for contacting the inner peripheral wall of the casing of the wellbore to be cut.

7. The abrasive jet cutting system according to claim 1 is equipped with a wellhead hydraulic anchor. Features: A plurality of teeth are arranged on the arc surface.

8. The abrasive jet cutting system according to claim 3 is equipped with a wellhead hydraulic anchor. Features: A plurality of water return grooves are provided at the bottom end of the shell, and the plurality of water return grooves are all connected to the rotating channel, and the water return grooves and the grooves are arranged alternately; The water return groove is used to provide an upward return space for the cutting fluid in the annular space.

9. An anchoring system, Features: It comprises a hydraulic controller, a first high-pressure ball valve, a second high-pressure ball valve and a supporting wellhead hydraulic anchor for an abrasive jet cutting system according to any one of claims 1 to 8; The hydraulic controller is connected to the second hydraulic pipeline and the wellhead hydraulic anchor through a first hydraulic pipeline, the first high-pressure ball valve is arranged on the first hydraulic pipeline, and the second high-pressure ball valve is arranged on the second hydraulic pipeline; When the wellhead hydraulic anchor anchors the wellbore to be cut, the hydraulic controller delivers hydraulic oil to the wellhead hydraulic anchor through the second high-pressure ball valve, and part of the hydraulic oil in the wellhead hydraulic anchor flows back to the hydraulic controller through the first high-pressure ball valve; When the wellhead hydraulic anchor is released from anchoring, the hydraulic controller delivers hydraulic oil to the wellhead hydraulic anchor through the first high-pressure ball valve, and part of the hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the second high-pressure ball valve.

10. A method of using the anchoring system as claimed in claim 9, characterized in that: it comprises the following steps: Place the wellhead hydraulic anchor into the wellbore to be cut, open the hydraulic controller, the first high-pressure ball valve and the second high-pressure ball valve, high-pressure hydraulic oil enters the wellhead hydraulic anchor through the second high-pressure ball valve to push the piston unit to slide upward, the anchor claws open, and the outer side walls of the anchor claws abut against the inner peripheral wall of the casing in the wellbore to be cut to achieve the anchoring function, and the low-pressure hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the first high-pressure ball valve; After cutting is completed, high-pressure hydraulic oil enters the wellhead hydraulic anchor through the first high-pressure ball valve to push the piston unit to slide downward, and the anchor claws retract under the action of their own gravity to achieve release from anchoring, and the low-pressure hydraulic oil in the wellhead hydraulic anchor flows back into the hydraulic controller through the second high-pressure ball valve.

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