Anchoring packer for hard formation open hole sidetrack drilling

Abstract

The invention discloses an anchoring packer for hard formation open hole sidetrack drilling. Comprising an upper connector, an anchoring mechanism and a rubber sleeve sealing mechanism from top to bottom, and the anchoring mechanism comprises a first setting cylinder, a first mandrel, a first upper cone, a first lower cone, a pair of first slip bodies, a spacer bush, a connecting sleeve, a second mandrel, a second setting cylinder, a second upper cone, a second lower cone and a pair of second slip bodies. The device has the beneficial effects that the anchoring mechanism and the rubber sleeve sealing mechanism are arranged, reliable anchoring force can be provided, and meanwhile reliable sealing performance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field drilling, and in particular to an anchor packer for open-hole sidetracking in hard formations. Background Art

[0002] With the rapid development of the offshore oil industry, the timeliness and cost of oilfield development and production have become increasingly critical issues. The window sidetracking technology can effectively increase oil and gas production and significantly reduce economic costs for both old and new wells. In the open-hole window sidetracking operation, the anchoring device plays an extremely important role. The traditional anchor only has an anchoring function, but cannot prevent the rock cuttings dropped during the sidetracking process from falling into the main well. It is only suitable for the case where the main wellbore is abandoned. In addition, the use of anchors without isolation functions may cause leakage, well gusts, or even blowouts during sidetracking due to the connection between the old wellbore and the formation. In order to ensure the reliability and safety of the open-hole window sidetracking operation, it is particularly important to develop a stable and reliable anchoring packer. Summary of the invention

[0003] The object of the present invention is to provide an anchoring packer for open-hole side drilling in hard formations, which is provided with an upper joint, an anchoring mechanism and a rubber sleeve sealing mechanism, can provide reliable anchoring force and has reliable sealing performance.

[0004] To achieve the above object, the present invention adopts the following technical solution, which includes, from top to bottom, an upper joint, an anchoring mechanism and a rubber cylinder sealing mechanism, wherein the anchoring mechanism includes:

[0005] A first sealing cylinder, the upper end of which is threadedly connected to the lower part of the upper joint, and a radial first upper slip opening and a first lower slip opening are respectively provided at the upper part and the lower part of the first sealing cylinder;

[0006] A first mandrel, which is axially arranged in the first setting cylinder, a front end of the first mandrel is inserted into the upper joint and threadedly connected to the upper joint, and a first pressure transmission hole parallel to the axial direction is provided on the side wall of the first mandrel;

[0007] A first upper vertebra and a first lower vertebra are arranged between the first core shaft and the first setting cylinder, a first upper vertebra connecting portion is arranged at the lower end of the first upper vertebra, a first lower vertebra connecting portion is arranged at the upper end of the first lower vertebra, the first upper vertebra connecting portion and the first lower vertebra connecting portion overlap each other, and a first locking ring is arranged between the first upper vertebra connecting portion and the first lower vertebra connecting portion; a first inclined surface with a gradually increasing diameter from top to bottom is arranged on the outer periphery of the first upper vertebra, and a second inclined surface with a gradually decreasing diameter from top to bottom is arranged on the outer periphery of the first lower vertebra; a first slip cavity is arranged on the inner periphery of the first upper vertebra connecting portion;

[0008] A pair of first slip bodies, which pass through the first upper slip opening and the first lower slip opening respectively, are arranged on the first inclined surface and the second inclined surface through slip screws, and are used to bite the well wall to achieve anchoring;

[0009] a spacer sleeve, the upper end of which is connected to the lower end of the first mandrel;

[0010] A connecting sleeve, which is sleeved on the outer periphery of the spacer sleeve, and the upper end of the connecting sleeve is connected to the lower end of the first setting cylinder;

[0011] A second mandrel, the upper end of which is connected to the spacer sleeve and the connecting sleeve in sequence; a fifth pressure transmission hole parallel to the axial direction is provided on the side wall of the second mandrel;

[0012] A second sealing cylinder is sleeved on the outer circumference of the second mandrel, and the upper end of the second sealing cylinder is connected to the lower end of the connecting sleeve; a second upper slip opening and a second lower slip opening are respectively provided at the upper part and the lower part of the second sealing cylinder;

[0013] A second upper vertebra and a second lower vertebra are arranged between the second mandrel and the second setting cylinder, a second upper vertebra connecting portion is arranged at the lower end of the second upper vertebra, a second lower vertebra connecting portion is arranged at the upper end of the second lower vertebra, the second upper vertebra connecting portion and the second lower vertebra connecting portion overlap with each other, a second locking ring is arranged between the second upper vertebra connecting portion and the second lower vertebra connecting portion; a third inclined surface with a diameter gradually increasing from top to bottom is arranged on the outer periphery of the second upper vertebra, a fourth inclined surface with a diameter gradually decreasing from top to bottom is arranged on the outer periphery of the second lower vertebra; a second slip cavity is arranged on the inner periphery of the second upper vertebra connecting portion;

[0014] A pair of second slip bodies, which pass through the second upper slip opening and the second lower slip opening respectively, are arranged on the third inclined surface and the fourth inclined surface through slip screws, and are used to bite the well wall to achieve anchoring;

[0015] Among them, a second pressure transmission hole is radially provided in the middle and upper part of the first core shaft, the inner end of the second pressure transmission hole is connected to the first pressure transmission hole, and the outer end of the second pressure transmission hole is connected to the first cava cavity; an annular space is formed between the spacer and the connecting sleeve; a third pressure transmission hole is radially provided on the end of the first core shaft and the spacer, the inner end of the third pressure transmission hole is connected to the first pressure transmission hole, and the outer end of the third pressure transmission hole is connected to the annular space; a fourth pressure transmission hole is radially provided at the end of the spacer, the outer end of the fourth pressure transmission hole is connected to the annular space, and the inner end of the fourth pressure transmission hole is connected to the fifth pressure transmission hole; a sixth pressure transmission hole is radially provided in the middle and upper part of the second core shaft, the inner end of the sixth pressure transmission hole is connected to the fifth pressure transmission hole, and the outer end of the sixth pressure transmission hole is connected to the second cava cavity.

[0016] Preferably, the rubber cartridge sealing mechanism comprises:

[0017] A piston, which is sleeved on the lower middle part of the second core shaft;

[0018] A shear ring, which is sleeved on the outer periphery of the piston, partially located on the inner periphery of the second setting cylinder and threadedly connected to the second setting cylinder, and the shear ring is connected to the piston via a shear pin;

[0019] A push cylinder is sleeved on the lower part of the second mandrel; the upper end of the push cylinder abuts against the lower end of the shear ring; the push cylinder is connected to the second mandrel through a third locking ring; the push cylinder is threadedly connected to the piston;

[0020] A rubber cylinder assembly is sleeved on the lower part of the second core shaft, and the upper end of the rubber cylinder assembly abuts against the lower end of the push cylinder;

[0021] a seventh pressure transmission hole, which is radially arranged at the lower middle part of the second core shaft and is connected with the end of the fifth pressure transmission hole;

[0022] Wherein, above the piston, a piston cavity connected with the seventh pressure transmission hole is formed between the second core shaft, the second sealing cylinder and the piston.

[0023] Preferably, the rubber cylinder assembly includes, from top to bottom, an upper shoulder guard, a first rubber cylinder, a second rubber cylinder, a third rubber cylinder and a lower shoulder guard.

[0024] Preferably, it also includes:

[0025] The upper part of the lower joint is arranged between the rubber cylinder assembly and the second core shaft, the upper end of the lower joint is in contact with the push cylinder, and the inner periphery of the upper part of the lower joint is connected with the second core shaft.

[0026] Preferably, it also includes:

[0027] A plurality of slip alloy teeth are respectively welded on the outer end surfaces of the first slip body and the second slip body, so as to improve the bite force of the first slip body and the second slip body.

[0028] Preferably, it also includes:

[0029] A first threaded hole, which is arranged in the middle of the upper joint and is connected to the first pressure transmission hole, and a first plug is arranged in the first threaded hole;

[0030] A second threaded hole, which is arranged at the front end of the second mandrel, and a second plug is arranged in the second threaded hole;

[0031] A third threaded hole is provided on the connecting sleeve and communicated with the annular space, and a third plug is provided in the third threaded hole.

[0032] Preferably, a first opening is provided on the first locking ring, and a first anti-rotation screw is provided at the first opening; a second opening is provided on the second locking ring, and a second anti-rotation screw is provided at the second opening; a third opening is provided on the third locking ring, and a third anti-rotation screw is provided at the third opening.

[0033] Preferably, a first sealing groove is provided on the inner circumference of the middle part of the first mandrel, and a first sealing ring is provided in the first sealing groove; a second sealing groove is provided on the inner circumference of the upper part of the first upper vertebral body, and a second sealing ring is provided in the second sealing groove; a third sealing groove is provided on the outer circumference of the middle part of the first upper vertebral body, and a third sealing ring is provided in the third sealing groove; a fourth sealing groove is provided on the outer circumference of the upper part of the first lower vertebral body, and a fourth sealing ring is provided in the fourth sealing groove; a fifth sealing groove is provided on the inner circumference of the middle part of the first lower vertebral body, and a fifth sealing ring is provided in the fifth sealing groove; a sixth sealing groove is provided on the outer circumference of the middle and lower part of the first mandrel, and a sixth sealing ring is provided in the sixth sealing groove; a seventh sealing groove is provided on the outer circumference of the upper part of the connecting sleeve, and a seventh sealing ring is provided in the seventh sealing groove; an eighth sealing groove and a ninth sealing groove are provided on the inner circumferences of the upper and lower parts of the spacer, respectively, and an eighth sealing ring and a ninth sealing ring are provided in the eighth sealing groove and the ninth sealing groove, respectively; a tenth sealing groove is provided on the inner circumference of the middle part of the connecting sleeve A sealing groove is provided, and a tenth sealing ring is provided in the tenth sealing groove; an eleventh sealing groove and a twelfth sealing groove are provided on the inner periphery and the outer periphery of the middle part of the second upper vertebral body respectively, and an eleventh sealing ring and a twelfth sealing ring are provided in the eleventh sealing groove and the twelfth sealing groove respectively; a thirteenth sealing groove and a fourteenth sealing groove are provided on the outer periphery and the inner periphery of the middle part of the second lower vertebral body respectively, and a thirteenth sealing ring and a fourteenth sealing ring are provided in the thirteenth sealing groove and the fourteenth sealing groove respectively; a sealing groove is provided at the middle and lower part of the second mandrel A fifteenth sealing groove is provided on the outer circumference, and a fifteenth sealing ring is provided in the fifteenth sealing groove; a sixteenth sealing groove is provided on the outer circumference of the upper part of the piston, and a sixteenth sealing ring is provided in the sixteenth sealing groove; a seventeenth sealing groove is provided on the inner circumference of the upper part of the piston, and a seventeenth sealing ring is provided in the seventeenth sealing groove; an eighteenth sealing groove and a nineteenth sealing groove are provided on the inner circumferences of the upper and lower parts of the lower joint, respectively, and an eighteenth sealing ring and a nineteenth sealing ring are provided in the eighteenth sealing groove and the nineteenth sealing groove.

[0034] Preferably, the upper joint and the first core shaft are connected by a first fixing pin; the first sealing cylinder and the upper joint are connected by a second fixing pin; the first sealing cylinder and the connecting sleeve are connected by a third fixing pin; the connecting sleeve and the second core shaft are connected by a fourth fixing pin; the connecting sleeve and the second sealing cylinder are connected by a fifth fixing pin; and the lower joint and the second core shaft are connected by a sixth fixing pin.

[0035] The beneficial effects of the present invention are as follows: the upper joint, the anchoring mechanism and the rubber sleeve sealing mechanism are provided, which can provide a reliable anchoring force and have a reliable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a cross-sectional view of the anchored packer for open-hole sidetracking in hard formations according to the present invention (unanchored and unpacked state).

[0037] Figure 2 It is a cross-sectional view of the anchor packer for open hole sidetracking in hard formations according to the present invention (anchored packer state).

[0038] Figure 3 It is a cross-sectional view of the first sealing cylinder in the present invention.

[0039] Figure 4 It is a cross-sectional view of the second sealing tube in the present invention.

[0040] Figure 5 It is a cross-sectional view of the sealing mechanism of the rubber cylinder in the present invention.

[0041] Figure 6 It is a cross-sectional view of the rubber cartridge assembly in the present invention. DETAILED DESCRIPTION

[0042] The invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0043] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0044] like Figure 1-6 As shown, an anchor packer 1 for open hole sidetracking in hard formations of the present invention comprises, from top to bottom, an upper joint 100, an anchor mechanism and a rubber sleeve sealing mechanism 300, wherein the anchor mechanism comprises:

[0045] The upper end of the first sealing cylinder 210 is threadedly connected to the lower part of the upper joint 100, and a radial first upper slip opening 211 and a first lower slip opening 212 are respectively provided at the upper part and the lower part of the first sealing cylinder 210;

[0046] The first mandrel 220 is axially arranged in the first setting cylinder 210, the front end of the first mandrel 220 is inserted into the upper joint 100 and is threadedly connected with the upper joint 100, and a first pressure transmission hole 221 parallel to the axial direction is provided on the side wall of the first mandrel 220;

[0047] The first upper vertebral body 213 and the first lower vertebral body 214 are arranged between the first mandrel 220 and the first setting cylinder 210. A first upper vertebral body connecting portion 213a is provided at the lower end of the first upper vertebral body 213, and a first lower vertebral body connecting portion 214a is provided at the upper end of the first lower vertebral body 214. The first upper vertebral body connecting portion 213a and the first lower vertebral body connecting portion 214a overlap each other, and a first locking ring 215 is provided between the first upper vertebral body connecting portion 213a and the first lower vertebral body connecting portion 214a; a first inclined surface 213b with a diameter gradually increasing from top to bottom is provided on the outer periphery of the first upper vertebral body 213, and a second inclined surface 214b with a diameter gradually decreasing from top to bottom is provided on the outer periphery of the first lower vertebral body 214; a first slip cavity 213c is provided on the inner periphery of the first upper vertebral body connecting portion 213a;

[0048] A pair of first slip bodies 216, which pass through the first upper slip opening 211 and the first lower slip opening 212 respectively, and are arranged on the first inclined surface 213b and the second inclined surface 214b through slip screws 217, so as to bite the well wall and realize anchoring;

[0049] A spacer 230, the upper end of which is connected to the lower end of the first mandrel 220;

[0050] A connecting sleeve 240 is sleeved on the outer circumference of the spacer sleeve 230, and the upper end of the connecting sleeve 240 is connected to the lower end of the first setting cylinder 210;

[0051] A second mandrel 250, the upper end of which is connected to the spacer sleeve 230 and the connecting sleeve 240 in sequence; a fifth pressure transmission hole 251 parallel to the axial direction is provided on the side wall of the second mandrel 250;

[0052] A second sealing cylinder 260 is sleeved on the outer circumference of the second core shaft 250, and the upper end of the second sealing cylinder 260 is connected to the lower end of the connecting sleeve 240; a second upper slip opening 261 and a second lower slip opening 262 are respectively provided at the upper and lower parts of the second sealing cylinder 260;

[0053] The second upper vertebra 263 and the second lower vertebra 264 are arranged between the second mandrel 250 and the second setting cylinder 260, a second upper vertebra connection portion 263a is provided at the lower end of the second upper vertebra 263, a second lower vertebra connection portion 264a is provided at the upper end of the second lower vertebra 264, the second upper vertebra connection portion 263a and the second lower vertebra connection portion 264a overlap each other, a second locking ring 265 is provided between the second upper vertebra connection portion 263a and the second lower vertebra connection portion 264a; a third inclined surface 263b with a diameter gradually increasing from top to bottom is provided on the outer periphery of the second upper vertebra 263, a fourth inclined surface 264b with a diameter gradually decreasing from top to bottom is provided on the outer periphery of the second lower vertebra 264; a second slip cavity 263c is provided on the inner periphery of the second upper vertebra connection portion 263a;

[0054] A pair of second slip bodies 266, which pass through the second upper slip opening 261 and the second lower slip opening 262 respectively, and are arranged on the third inclined surface 263b and the fourth inclined surface 264b through slip screws 267, so as to bite the well wall and realize anchoring;

[0055] A second pressure transmission hole 222 is radially provided in the middle and upper part of the first mandrel 220, the inner end of the second pressure transmission hole 222 is connected to the first pressure transmission hole 221, and the outer end of the second pressure transmission hole 222 is connected to the first slip cavity 213c; an annular space 231 is formed between the spacer 230 and the connecting sleeve 240; a third pressure transmission hole 232 is radially provided on the end of the first mandrel 220 and the spacer 230, the inner end of the third pressure transmission hole 232 is connected to the first pressure transmission hole 221, and the third pressure transmission hole 232 is connected to the first pressure transmission hole 221. The outer end of the pressure hole 232 is connected to the annular space 231; a fourth pressure transmission hole 233 is radially provided at the end of the spacer sleeve 230, the outer end of the fourth pressure transmission hole 233 is connected to the annular space 231, and the inner end of the fourth pressure transmission hole 233 is connected to the fifth pressure transmission hole 251; a sixth pressure transmission hole 252 is radially provided in the upper middle part of the second core shaft 250, the inner end of the sixth pressure transmission hole 252 is connected to the fifth pressure transmission hole 251, and the outer end of the sixth pressure transmission hole 252 is connected to the second cava cavity 263c.

[0056] During use, the upper joint 100 is connected to the bevel device and then sent into the well. After reaching the designated position, pressure is applied. The pressure passes through the first pressure transmission hole 221 and the second pressure transmission hole 222 and reaches the first cava cavity 213c, acting on the first upper vertebral body 213 and the first lower vertebral body 214, causing the first upper vertebral body 213 and the first lower vertebral body 214 to move upward and downward respectively until the first anti-rotation screw 215a on the first locking ring 215 is sheared, so that the first cava body 216, under the action of the first inclined surface 213b and the second inclined surface 214b, extends out of the first upper cava mouth 211 and the first lower cava mouth 212 to bite the well wall. At the same time, the pressure reaches the second cava cavity 263c through the first pressure transmission hole 221, the third pressure transmission hole 232, the annular space 231, the fourth pressure transmission hole 233, the fifth pressure transmission hole 251, and the sixth pressure transmission hole 252, and acts on the second upper vertebra 263 and the second lower vertebra 264, causing the second upper vertebra 263 and the second lower vertebra 264 to move upward and downward respectively until the second anti-rotation screw 265a on the second locking ring 265 is sheared, so that the second cava body 266, under the action of the third inclined surface 263b and the fourth inclined surface 264b, extends out of the second upper cava mouth 261 and the second lower cava mouth 262 to bite the well wall. Continue to pressurize, and the pressure enters the piston cavity 311 through the first pressure transmission hole 221, the third pressure transmission hole 232, the annular space 231, the fourth pressure transmission hole 233, the fifth pressure transmission hole 251, and the seventh pressure transmission hole 253, pushing the piston 310 and the push cylinder 330 downward, and the rubber cylinder assembly 350 expands radially due to compression and is sealed on the well wall to achieve sealing.

[0057] In another embodiment, the rubber cylinder sealing mechanism 300 includes: a piston 310, which is sleeved on the lower part of the second core shaft 250; a shear ring 320, which is sleeved on the outer periphery of the piston 310, partially located on the inner periphery of the second sealing cylinder 260 and threadedly connected to the second sealing cylinder 260, and the shear ring 320 is connected to the piston 310 through a shear pin 321; a push cylinder 330, which is sleeved on the lower part of the second core shaft 250; the upper end of the push cylinder 330 is in contact with the lower end of the shear ring 320; the push cylinder 330 is locked by a third locking ring 340 is connected to the second core shaft 250; the push cylinder 330 is threadedly connected to the piston 310; the rubber cylinder assembly 350 is sleeved on the lower part of the second core shaft 250, and the upper end of the rubber cylinder assembly 340 is abutted against the lower end of the push cylinder 330; the seventh pressure transmission hole 253 is radially arranged in the lower middle part of the second core shaft 250, and is connected to the end of the fifth pressure transmission hole 251; wherein, above the piston 310, a piston chamber 311 connected to the seventh pressure transmission hole 253 is formed between the second core shaft 250, the second sealing cylinder 260 and the piston 310.

[0058] In another embodiment, the rubber cylinder assembly 350 includes, from top to bottom, an upper shoulder guard 351 , a first rubber cylinder 352 , a second rubber cylinder 353 , a third rubber cylinder 354 and a lower shoulder guard 355 .

[0059] In another embodiment, it further includes: a lower joint 400, the upper part of which is arranged between the rubber cylinder assembly 300 and the second core shaft 250, the upper end of the lower joint 400 is in contact with the push cylinder 330, and the inner periphery of the upper part of the lower joint 400 is connected to the second core shaft 250.

[0060] In another embodiment, it also includes: a plurality of slip alloy teeth 270, which are respectively welded on the outer end surfaces of the first slip body 216 and the second slip body 266, so as to improve the bite force of the first slip body 216 and the second slip body 266.

[0061] In another embodiment, it also includes: a first threaded hole, which is arranged in the middle of the upper joint 100 and is connected to the first pressure transmission hole 221, and a first plug 510 is provided in the first threaded hole; a second threaded hole, which is arranged at the front end of the second core shaft 220, and a second plug 520 is provided in the second threaded hole; a third threaded hole, which is arranged on the connecting sleeve 240 and is connected to the annular space, and a third plug 530 is provided in the third threaded hole.

[0062] In another embodiment, a first opening is provided on the first locking ring 215, and a first anti-rotation screw 215a is provided at the first opening; a second opening is provided on the second locking ring 265, and a second anti-rotation screw 265a is provided at the second opening; a third opening is provided on the third locking ring 340, and a third anti-rotation screw 341 is provided at the third opening.

[0063] In another embodiment, a first sealing groove is provided on the inner circumference of the middle part of the first core shaft 220, and a first sealing ring 601 is provided in the first sealing groove; a second sealing groove is provided on the inner circumference of the upper part of the first upper vertebral body 213, and a second sealing ring 602 is provided in the second sealing groove; a third sealing groove is provided on the outer circumference of the middle part of the first upper vertebral body 213, and a third sealing ring 603 is provided in the third sealing groove; a fourth sealing groove is provided on the outer circumference of the upper part of the first lower vertebral body 214, and a fourth sealing ring 604 is provided in the fourth sealing groove; a A fifth sealing groove is provided in which a fifth sealing ring 605 is arranged; a sixth sealing groove is provided on the outer periphery of the middle and lower part of the first core shaft 220, and a sixth sealing ring 606 is arranged in the sixth sealing groove; a seventh sealing groove is provided on the outer periphery of the upper part of the connecting sleeve 240, and a seventh sealing ring 607 is arranged in the seventh sealing groove; an eighth sealing groove and a ninth sealing groove are provided on the inner periphery of the upper and lower parts of the spacer sleeve 230, respectively, and an eighth sealing ring 608 and a ninth sealing ring 609 are arranged in the eighth sealing groove and the ninth sealing groove, respectively; an inner periphery of the middle part of the connecting sleeve 240 is provided with a sixth sealing groove, and a sixth sealing ring 606 is arranged in the sixth sealing groove; a seventh sealing groove is provided on the outer periphery of the upper part of the connecting sleeve 240, and a seventh sealing ring 607 is arranged in the seventh sealing groove; an eighth sealing groove and a ninth sealing groove are provided on the inner periphery of the upper and lower parts of the spacer sleeve 230, respectively, and an eighth sealing ring 608 and a ninth sealing ring 609 are arranged in the eighth sealing groove and the ninth sealing groove, respectively; A tenth sealing groove is provided, and a tenth sealing ring 610 is provided in the tenth sealing groove; an eleventh sealing groove and a twelfth sealing groove are provided on the inner periphery and the outer periphery of the middle part of the second upper cone 263, respectively, and an eleventh sealing ring 611 and a twelfth sealing ring 612 are provided in the eleventh sealing groove and the twelfth sealing groove, respectively; a thirteenth sealing groove and a fourteenth sealing groove are provided on the outer periphery and the inner periphery of the middle part of the second lower cone 264, respectively, and a thirteenth sealing ring 613 and a fourteenth sealing ring 614 are provided in the thirteenth sealing groove and the fourteenth sealing groove, respectively; in the second mandrel 250 A fifteenth sealing groove is provided on the outer periphery of the lower part, and a fifteenth sealing ring 615 is provided in the fifteenth sealing groove; a sixteenth sealing groove is provided on the outer periphery of the upper part of the piston 310, and a sixteenth sealing ring 616 is provided in the sixteenth sealing groove; a seventeenth sealing groove is provided on the inner periphery of the upper part of the piston 310, and a seventeenth sealing ring 617 is provided in the seventeenth sealing groove; an eighteenth sealing groove and a nineteenth sealing groove are provided on the inner periphery of the upper part and the lower part of the lower joint 400, respectively, and an eighteenth sealing ring 618 and a nineteenth sealing ring 619 are provided in the eighteenth sealing groove and the nineteenth sealing groove.

[0064] In another embodiment, the upper joint 100 and the first core shaft 220 are connected by a first fixing pin 701; the first sealing cylinder 210 and the upper joint 100 are connected by a second fixing pin 702; the first sealing cylinder 210 and the connecting sleeve 240 are connected by a third fixing pin 703; the connecting sleeve 240 and the second core shaft 250 are connected by a fourth fixing pin 704; the connecting sleeve 240 and the second sealing cylinder 260 are connected by a fifth fixing pin 705; and the lower joint 400 and the second core shaft 250 are connected by a sixth fixing pin 706.

[0065] In summary, the anchor packer 1 for open hole sidetracking in hard formations of the present invention is provided with an upper joint 100, an anchoring mechanism and a rubber sleeve sealing mechanism 300, which can provide a reliable anchoring force and has a reliable sealing performance.

[0066] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An anchor packer for open hole sidetracking in hard formations, comprising, from top to bottom, an upper joint, an anchor mechanism and a rubber sleeve sealing mechanism, characterized in that: The anchoring mechanism comprises: A first sealing cylinder, the upper end of which is threadedly connected to the lower part of the upper joint, and a radial first upper slip opening and a first lower slip opening are respectively provided at the upper part and the lower part of the first sealing cylinder; A first mandrel, which is axially arranged in the first setting cylinder, a front end of the first mandrel is inserted into the upper joint and threadedly connected to the upper joint, and a first pressure transmission hole parallel to the axial direction is provided on the side wall of the first mandrel; A first upper vertebra and a first lower vertebra are arranged between the first core shaft and the first setting cylinder, a first upper vertebra connecting portion is arranged at the lower end of the first upper vertebra, a first lower vertebra connecting portion is arranged at the upper end of the first lower vertebra, the first upper vertebra connecting portion and the first lower vertebra connecting portion overlap each other, and a first locking ring is arranged between the first upper vertebra connecting portion and the first lower vertebra connecting portion; a first inclined surface with a gradually increasing diameter from top to bottom is arranged on the outer periphery of the first upper vertebra, and a second inclined surface with a gradually decreasing diameter from top to bottom is arranged on the outer periphery of the first lower vertebra; a first slip cavity is arranged on the inner periphery of the first upper vertebra connecting portion; A pair of first slip bodies, which pass through the first upper slip opening and the first lower slip opening respectively, are arranged on the first inclined surface and the second inclined surface through slip screws, and are used to bite the well wall to achieve anchoring; a spacer sleeve, the upper end of which is connected to the lower end of the first mandrel; A connecting sleeve, which is sleeved on the outer periphery of the spacer sleeve, and the upper end of the connecting sleeve is connected to the lower end of the first setting cylinder; A second mandrel, the upper end of which is connected to the spacer sleeve and the connecting sleeve in sequence; a fifth pressure transmission hole parallel to the axial direction is provided on the side wall of the second mandrel; A second sealing cylinder is sleeved on the outer circumference of the second mandrel, and the upper end of the second sealing cylinder is connected to the lower end of the connecting sleeve; a second upper slip opening and a second lower slip opening are respectively provided at the upper part and the lower part of the second sealing cylinder; A second upper vertebra and a second lower vertebra are arranged between the second mandrel and the second setting cylinder, a second upper vertebra connecting portion is arranged at the lower end of the second upper vertebra, a second lower vertebra connecting portion is arranged at the upper end of the second lower vertebra, the second upper vertebra connecting portion and the second lower vertebra connecting portion overlap with each other, a second locking ring is arranged between the second upper vertebra connecting portion and the second lower vertebra connecting portion; a third inclined surface with a diameter gradually increasing from top to bottom is arranged on the outer periphery of the second upper vertebra, a fourth inclined surface with a diameter gradually decreasing from top to bottom is arranged on the outer periphery of the second lower vertebra; a second slip cavity is arranged on the inner periphery of the second upper vertebra connecting portion; A pair of second slip bodies, which pass through the second upper slip opening and the second lower slip opening respectively, are arranged on the third inclined surface and the fourth inclined surface through slip screws, and are used to bite the well wall to achieve anchoring; Among them, a second pressure transmission hole is radially provided in the middle and upper part of the first core shaft, the inner end of the second pressure transmission hole is connected to the first pressure transmission hole, and the outer end of the second pressure transmission hole is connected to the first cava cavity; an annular space is formed between the spacer and the connecting sleeve; a third pressure transmission hole is radially provided on the end of the first core shaft and the spacer, the inner end of the third pressure transmission hole is connected to the first pressure transmission hole, and the outer end of the third pressure transmission hole is connected to the annular space; a fourth pressure transmission hole is radially provided at the end of the spacer, the outer end of the fourth pressure transmission hole is connected to the annular space, and the inner end of the fourth pressure transmission hole is connected to the fifth pressure transmission hole; a sixth pressure transmission hole is radially provided in the middle and upper part of the second core shaft, the inner end of the sixth pressure transmission hole is connected to the fifth pressure transmission hole, and the outer end of the sixth pressure transmission hole is connected to the second cava cavity.

2. The anchor packer for open hole sidetracking in hard formation according to claim 1, characterized in that: The rubber cylinder sealing mechanism comprises: A piston, which is sleeved on the lower middle part of the second core shaft; A shear ring, which is sleeved on the outer periphery of the piston, partially located on the inner periphery of the second setting cylinder and threadedly connected to the second setting cylinder, and the shear ring is connected to the piston via a shear pin; A push cylinder is sleeved on the lower part of the second mandrel; the upper end of the push cylinder abuts against the lower end of the shear ring; the push cylinder is connected to the second mandrel through a third locking ring; the push cylinder is threadedly connected to the piston; A rubber cylinder assembly is sleeved on the lower part of the second core shaft, and the upper end of the rubber cylinder assembly abuts against the lower end of the push cylinder; a seventh pressure transmission hole, which is radially arranged at the lower middle part of the second core shaft and is connected with the end of the fifth pressure transmission hole; Wherein, above the piston, a piston cavity connected with the seventh pressure transmission hole is formed between the second core shaft, the second sealing cylinder and the piston.

3. The anchor packer for open hole sidetracking in hard formation according to claim 2, characterized in that: The rubber cylinder assembly comprises an upper shoulder guard, a first rubber cylinder, a second rubber cylinder, a third rubber cylinder and a lower shoulder guard in sequence from top to bottom.

4. The anchor packer for open hole sidetracking in hard formation according to claim 2, characterized in that: Also includes: The upper part of the lower joint is arranged between the rubber cylinder assembly and the second core shaft, the upper end of the lower joint is in contact with the push cylinder, and the inner periphery of the upper part of the lower joint is connected with the second core shaft.

5. The anchor packer for open hole sidetracking in hard formation according to claim 1 or 2, characterized in that: Also includes: A plurality of slip alloy teeth are respectively welded on the outer end surfaces of the first slip body and the second slip body, so as to improve the bite force of the first slip body and the second slip body.

6. The anchor packer for open hole sidetracking in hard formation according to claim 1 or 2, characterized in that: Also includes: A first threaded hole, which is arranged in the middle of the upper joint and is connected to the first pressure transmission hole, and a first plug is arranged in the first threaded hole; A second threaded hole, which is arranged at the front end of the second mandrel, and a second plug is arranged in the second threaded hole; A third threaded hole is provided on the connecting sleeve and communicated with the annular space, and a third plug is provided in the third threaded hole.

7. The anchor packer for open hole sidetracking in hard formation according to claim 2, characterized in that: A first opening is provided on the first locking ring, and a first anti-rotation screw is provided at the first opening; a second opening is provided on the second locking ring, and a second anti-rotation screw is provided at the second opening; a third opening is provided on the third locking ring, and a third anti-rotation screw is provided at the third opening.

8. The anchor packer for open hole sidetracking in hard formation according to claim 4, characterized in that: A first sealing groove is provided on the inner circumference of the middle part of the first mandrel, and a first sealing ring is provided in the first sealing groove; a second sealing groove is provided on the inner circumference of the upper part of the first upper vertebral body, and a second sealing ring is provided in the second sealing groove; a third sealing groove is provided on the outer circumference of the middle part of the first upper vertebral body, and a third sealing ring is provided in the third sealing groove; a fourth sealing groove is provided on the outer circumference of the upper part of the first lower vertebral body, and a fourth sealing ring is provided in the fourth sealing groove; a fifth sealing groove is provided on the inner circumference of the middle part of the first lower vertebral body, and a fifth sealing ring is provided in the fifth sealing groove; a sixth sealing groove is provided on the outer circumference of the middle and lower part of the first mandrel, and a sixth sealing ring is provided in the sixth sealing groove; a seventh sealing groove is provided on the outer circumference of the upper part of the connecting sleeve, and a seventh sealing ring is provided in the seventh sealing groove; an eighth sealing groove and a ninth sealing groove are provided on the inner circumferences of the upper and lower parts of the spacer, respectively, and an eighth sealing ring and a ninth sealing ring are provided in the eighth sealing groove and the ninth sealing groove, respectively; a tenth sealing groove is provided on the inner circumference of the middle part of the connecting sleeve , a tenth sealing ring is arranged in the tenth sealing groove; an eleventh sealing groove and a twelfth sealing groove are respectively arranged on the inner circumference and the outer circumference of the middle part of the second upper vertebral body, and an eleventh sealing ring and a twelfth sealing ring are respectively arranged in the eleventh sealing groove and the twelfth sealing groove; a thirteenth sealing groove and a fourteenth sealing groove are respectively arranged on the outer circumference and the inner circumference of the middle part of the second lower vertebral body, and a thirteenth sealing ring and a fourteenth sealing ring are respectively arranged in the thirteenth sealing groove and the fourteenth sealing groove; a fifteenth sealing groove is arranged on the outer circumference of the middle and lower part of the second core shaft, and a fifteenth sealing ring is arranged in the fifteenth sealing groove; a sixteenth sealing groove is arranged on the outer circumference of the upper part of the piston, and a sixteenth sealing ring is arranged in the sixteenth sealing groove; a seventeenth sealing groove is arranged on the inner circumference of the upper part of the piston, and a seventeenth sealing ring is arranged in the seventeenth sealing groove; an eighteenth sealing groove and a nineteenth sealing groove are respectively arranged on the inner circumference of the upper part and the lower part of the lower joint, and an eighteenth sealing ring and a nineteenth sealing ring are arranged in the eighteenth sealing groove and the nineteenth sealing groove.

9. The anchor packer for open hole sidetracking in hard formation according to claim 3, characterized in that: The upper joint and the first core shaft are connected by a first fixing pin; the first sealing cylinder and the upper joint are connected by a second fixing pin; the first sealing cylinder and the connecting sleeve are connected by a third fixing pin; the connecting sleeve and the second core shaft are connected by a fourth fixing pin; the connecting sleeve and the second sealing cylinder are connected by a fifth fixing pin; the lower joint and the second core shaft are connected by a sixth fixing pin.

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