CN115680530A - Prestressed well completion ground anchor - Google Patents
Prestressed well completion ground anchor Download PDFInfo
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- CN115680530A CN115680530A CN202110826238.XA CN202110826238A CN115680530A CN 115680530 A CN115680530 A CN 115680530A CN 202110826238 A CN202110826238 A CN 202110826238A CN 115680530 A CN115680530 A CN 115680530A
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- 238000007789 sealing Methods 0.000 claims abstract description 45
- 241000935974 Paralichthys dentatus Species 0.000 claims abstract description 39
- 238000004873 anchoring Methods 0.000 claims abstract description 17
- 210000000078 claw Anatomy 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
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- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 64
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- 238000004519 manufacturing process Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
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- 239000003129 oil well Substances 0.000 description 5
- 241000242541 Trematoda Species 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000028952 catclaw acacia Species 0.000 description 1
- 235000004608 catclaw acacia Nutrition 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses a prestressed well completion ground anchor, which comprises a pushing assembly and an anchoring assembly, wherein the pushing assembly comprises a hydraulic cylinder; the anchor assembly comprises an anchor body, the top end of the anchor body is connected with the bottom end of the hydraulic cylinder in a sealing mode, an oil through hole and a plurality of mounting holes are formed in the anchor body, the oil through hole and the mounting holes are provided with a first end and a second end, the first end of the oil through hole is communicated with the hydraulic cylinder, the other end of the oil through hole is arranged in a sealing mode, each mounting hole is formed in the anchor body, the first end of each mounting hole is communicated with the middle of the oil through hole, the other end of each mounting hole extends to the periphery of the anchor body, and an anchor claw capable of extending out the mounting holes is arranged in each mounting hole. The anchor fluke of the ground anchor provided by the invention has large driving force and anchoring force, is suitable for different stratums, overcomes the defect that the size and the structure of a tool need to be adjusted aiming at the stratums with different hardness in the past, can greatly improve the anchoring reliability, and has very great practical benefit along with the gradual deep expansion of the thick oil development.
Description
Technical Field
The invention belongs to the technical field of well completion of an oil field thermal production well, and particularly relates to a prestressed well completion ground anchor.
Background
The prestressed well completion ground anchor is used for fixing a casing in a borehole, the ground anchor is arranged at the lowest part of a pipe string, and after well cementation, a cat claw of the ground anchor is expanded by collision and pressing to anchor the bottom layer, so that the purpose of lifting is realized. The specified casing string of the prestressed well completion ground anchor is characterized in that the produced petroleum is thick oil with high viscosity, so that the production is carried out by injecting high-temperature steam with the temperature of more than 300 ℃ usually, and the yield of the thick oil well is improved. Because of the influence of high-temperature steam, the casing pipe can extend and deform in the well, the casing pipe is blown out of the well mouth, the cement sheath between the casing pipe and the well wall is damaged, and the production life of the oil well is seriously influenced.
However, in the field implementation process, due to the fact that the anchoring force of the ground anchor for well completion of the thickened oil thermal production well is low, the elongation of the casing is strictly limited by the annular steel plate of the well mouth, the prestress construction difficulty is increased, and the casing is subjected to cold-heat exchange variable load during production, so that large-area casing damage is caused. 7082 of the existing casing damage wells of Liaohe oil fields in general survey show that the average casing damage rate is 28.8 percent (24578 of total wells), 2928 of the casing damage wells stop producing, 2680 of the defective production wells, and the two accounts for 78 percent of the total casing damage wells. The production stop directly affects the daily yield of 800 tons of crude oil due to casing damage. Wherein, the loss rate of the thermal recovery casing well 5658 is as high as 36.8% in the front 8 rounds of the thermal recovery production well. The production time efficiency of the thermal production well is seriously influenced, and the well repair operation cost is greatly increased.
The existing ground anchors used on site are mechanical ground anchors, the fluke is pushed away to form a certain angle by hydraulic pressure, the fluke is embedded into the stratum by lifting, and the fluke presents a barb on a hydraulic cylinder so as to lock the stratum more firmly. However, the mechanical ground anchor can not catch the stratum in the soft stratum, and the problem of anchoring failure often occurs.
Disclosure of Invention
In order to solve the technical problems, the invention provides a prestressed well completion ground anchor to solve the technical problem that the anchor fails frequently in the prior art.
The technical scheme of the invention is as follows:
the invention provides a prestressed well completion earth anchor, which comprises:
a pushing assembly comprising a hydraulic cylinder;
the anchor assembly comprises an anchor body, the top end of the anchor body is connected with the bottom end of the hydraulic cylinder, an oil through hole and a plurality of mounting holes are formed in the anchor body, the oil through hole and the mounting holes are respectively provided with a first end and a second end, the first end of the oil through hole is communicated with the hydraulic cylinder, the second end of the oil through hole is arranged in a sealing mode, each mounting hole is formed in the anchor body, the first end of the mounting hole is communicated with the middle of the oil through hole, the second end of the mounting hole extends to the peripheral surface of the anchor body, and an anchor claw capable of extending out of the mounting hole is arranged in each mounting hole;
the central axis of the anchor fluke is intersected with the central axis of the anchor body, and the included angle between the central axis of the anchor fluke and the central axis of the hydraulic cylinder is 65-120 degrees.
Further, the included angle is 80-100 degrees.
Further, the length of the fluke is smaller than the diameter of the anchor body by a ratio of 10-17.
Further, the aperture of the oil through hole is smaller than the inner diameter of the hydraulic cylinder.
Further, the ratio of the aperture of the oil through hole to the inner diameter of the hydraulic cylinder is 1.
Furthermore, a first check valve is fixedly arranged between the hydraulic cylinder and the oil through hole, an inlet of the first check valve is communicated with the hydraulic cylinder, and an outlet of the first check valve is communicated with the first end of the oil through hole.
Further, the first one-way valve comprises a fixed seat, a sealing element and a flow guide seat, wherein,
the fixed seat is fixed at the bottom of the hydraulic cylinder, the fixed seat is internally provided with a conical surface hole and a fixed hole which are communicated in sequence, the small end of the conical surface hole is communicated with the hydraulic cylinder, the flow guide seat is fixedly arranged in the fixed hole, the top end of the sealing element is operably propped against or separated from the inner wall of the conical surface hole, the bottom end of the sealing element can vertically and slidably penetrate through the central hole of the flow guide seat to the oil through hole,
and the flow guide seat is provided with a flow guide hole for communicating the conical surface hole and the oil through hole.
Furthermore, a first spring is sleeved outside the sealing element, the top end of the first spring is fixed in the middle of the sealing element, the bottom end of the first spring is abutted against the top end of the flow guide seat, and the first spring is arranged in the conical hole.
Further, the top end of the sealing element is conical.
Further, the earth anchor still includes the cementing subassembly, the cementing subassembly includes the outer tube, the lower part clearance cover of outer tube is established outside the hydraulic cylinder, the bottom of outer tube is in the partial sealed setting in the hydraulic cylinder outside, the lower part periphery of outer tube is provided with first through-hole.
Furthermore, an upper righting sleeve capable of vertically sliding is arranged in the middle of the inner side of the outer pipe, an embedding hole is formed in the middle of the bottom end of the upper righting sleeve, the top end of a piston of the hydraulic cylinder is embedded into the embedding hole of the upper righting sleeve, an upper flow guide hole which is vertically arranged is formed in the outer portion of the end face of the upper righting sleeve, and the upper flow guide hole is located on the outer side of the embedding hole.
Furthermore, a lower centering sleeve is fixedly arranged in the middle of the inner side of the outer pipe, the lower centering sleeve is positioned below the upper centering sleeve, a second through hole is formed in the middle of the end face of the lower centering sleeve, the piston vertically penetrates through the second through hole of the lower centering sleeve in a sliding manner, the bottom end of the lower centering sleeve is tightly pressed against the top end of the cylinder body of the hydraulic cylinder, and a lower flow guide hole which is vertically arranged is formed in the end face of the lower centering sleeve, which is arranged between the outer pipe and the cylinder body of the hydraulic cylinder.
Further, the outer tube includes from the top down that communicates the coupling, top tube, adapter tube and the low tube that sets up in proper order, the lower part of top tube the adapter tube with the equal clearance cover of low tube is established outside the hydraulic cylinder, the outside upper end of top tube is connected the inboard lower extreme of coupling, but go up to right the cover and set up vertically to slide the inboard of top tube, the outside lower extreme of top tube is connected the inboard upper end of adapter tube, it is fixed to set up the sleeve pipe of righting down the inboard lower extreme of top tube, the bottom of low tube is in the sealed setting of part outside the cylinder body of hydraulic cylinder, be provided with on the periphery of low tube first through-hole.
Further, the cementing assembly further comprises a second one-way valve, and the second one-way valve is arranged in an annular cavity between the adapting pipe and the cylinder body of the hydraulic cylinder.
Further, the second one-way valve includes a fixed plug and an opening plug, wherein,
the fixed plug with the opening plug is the annular, the fixed plug is fixed to be set up on the inner wall of adapter, the fixed plug clearance sets up the cylinder body periphery of hydraulic cylinder, the slidable ground of opening the plug sets up on the cylinder body periphery of hydraulic cylinder, the opening plug with the adapter clearance sets up, the top surface of opening the plug operationally with the bottom surface top of fixed plug is leaned on or is separated.
Furthermore, a second spring is sleeved on the periphery of the cylinder body of the hydraulic cylinder and arranged in the bearing pipe, the bottom surface of the opening plug is pressed against the top end of the second spring, and the bottom end of the second spring is fixedly arranged on the periphery of the cylinder body of the hydraulic cylinder.
Furthermore, an upper guide ring is fixedly arranged on the inner wall of the bearing pipe, the upper guide ring is fixedly sleeved on the periphery of the cylinder body of the hydraulic cylinder, the bottom end of the second spring is fixedly arranged at the top end of the upper guide ring, and a guide hole is formed in the end face of the upper guide ring. The beneficial effects of the invention at least comprise:
the invention provides a prestressed well completion ground anchor, which comprises a pushing assembly and an anchoring assembly, wherein the pushing assembly comprises a hydraulic cylinder; the anchoring assembly comprises an anchor body, the top end of the anchor body is connected with the bottom end of a hydraulic cylinder, an oil through hole and a plurality of mounting holes are formed in the anchor body, the oil through hole and the mounting holes are respectively provided with a first end and a second end, the first end of the oil through hole is communicated with the hydraulic cylinder, the second end of the oil through hole is arranged in a sealing mode, the aperture of the oil through hole is smaller than the inner diameter of the hydraulic cylinder, each mounting hole is formed in the anchor body, the first end of each mounting hole is communicated with the middle of the oil through hole, the second end of each mounting hole extends to the peripheral surface of the anchor body, an anchor fluke capable of extending out of the mounting hole is arranged in each mounting hole, the central shaft of the anchor fluke is intersected with the central shaft of the anchor body, and the included angle between the central shaft of the anchor fluke and the central shaft of the hydraulic cylinder is 65-120 degrees. After a designed amount of cement is driven into the space between the sleeve and the well wall, a large sealing element is thrown in, the large sealing element can realize impact pressure after reaching the top of the piston, the large sealing element moves downwards under the action of pressure so as to push the sealing element to move downwards along the inner wall of the hydraulic cylinder, oil in the hydraulic cylinder enters an oil through hole of the anchor body, and the other end of the oil through hole is arranged in a sealing manner, so that the oil in the hydraulic cylinder can push the anchor claw in the mounting hole to move towards the outside of the anchor body, and the anchor claw is pricked into the stratum; because the central axis of the fluke is intersected with the central axis of the anchor body, and the included angle between the central axis of the fluke and the central axis of the hydraulic cylinder is 65-120 degrees, the length of the fluke is longer, so that the depth of the fluke inserted into the stratum can be increased, the stratum can be locked more firmly, and the anchoring is stable.
Drawings
Fig. 1 is a schematic structural view of a ground anchor according to the present embodiment;
FIG. 2 is a schematic structural view of an outer tube of the earth anchor of FIG. 1;
FIG. 3 is a schematic diagram of the construction of the cementing assembly of FIG. 1;
FIG. 4 is a schematic view of the first check valve of FIG. 1;
FIG. 5 is a schematic view of the anchor assembly of FIG. 1;
figure 6 is a schematic top view of the bottom end face of the upper centering sleeve of figure 2.
Description of reference numerals:
100-pushing component, 110-piston, 120-cylinder, 130-first one-way valve, 131-fixing seat, 132-sealing element, 133-first spring, 134-guide seat;
200-an anchoring component, 210-an anchor body, 211-an oil through hole, 212-a mounting hole, 220-a fluke, 230-a baffle plate and 240-a bearing rotary head;
300-a cementing component-an outer pipe, 310-an outer pipe, 311-a coupling, 312-an upper pipe, 313-a socket pipe, 314-a lower pipe, 315-an upper centralizing sleeve, 315 a-an upper diversion hole, 315 b-an embedding hole, 316-a lower centralizing sleeve, 317-an upper diversion ring, 318-a lower diversion ring and 319-a first through hole; 320-a second one-way valve, 321-a fixed plug, 322-an opening plug, 323-a second spring and 324-a snap spring.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
Fig. 1 is a schematic structural view of a ground anchor according to the present embodiment, and fig. 2 to 6 are partial schematic structural views of fig. 1, and in conjunction with fig. 1 to 3, the present invention provides a prestressed completion ground anchor including a push assembly 100 and an anchor assembly 200.
Wherein the pushing assembly 100 comprises a hydraulic cylinder; the anchoring assembly 200 comprises an anchor body 210, the top end of the anchor body 210 is connected with the bottom end of a hydraulic cylinder in a sealing mode, an oil through hole 211 and a plurality of mounting holes 212 are formed in the anchor body 210, the oil through hole 211 and the mounting holes 212 are respectively provided with a first end and a second end, the first end of the oil through hole 211 is communicated with the hydraulic cylinder, the second end of the oil through hole 211 is arranged in a sealing mode, each mounting hole 212 is formed in the anchor body 210, the first end of each mounting hole 212 is communicated with the middle of the oil through hole 211, the second end of each mounting hole 212 extends to the peripheral surface of the anchor body 210, an anchor fluke 220 is arranged in each mounting hole 212 in a sealing mode, the central axis of the anchor fluke 220 is intersected with the central axis of the anchor body 210, and the included angle between the central axis of the anchor fluke 220 and the central axis of the hydraulic cylinder is 65-120 degrees.
After cement with the designed amount is injected between the casing and the well wall, a large rubber plug is injected, the large rubber plug can be pressed after reaching the top of the piston 110, the large rubber plug moves downwards under the action of pressure, so that the large rubber plug 110 is pushed to move downwards along the inner wall of the hydraulic cylinder 120, oil in the hydraulic cylinder 120 enters the oil through hole 211 of the anchor body 210, and the other end of the oil through hole 211 is sealed, so that the oil in the hydraulic cylinder can push the anchor claw 220 in the mounting hole 212 to move towards the outside of the anchor body 210, the anchor claw 220 is inserted into the stratum, as the central shaft of the anchor claw 220 is intersected with the central shaft of the anchor body 210, and the included angle between the central shaft of the anchor claw 220 and the central shaft of the hydraulic cylinder is 65-120 degrees, the length of the anchor claw 220 is longer, the depth of the anchor claw 220 inserted into the stratum can be lengthened, the stratum can be locked more firmly, and the anchoring is stable.
The number of flukes 220 may be provided with a plurality, such as three flukes, six flukes, eight flukes, without being limited thereto. Fluke 220 may be radially spaced about the circumference of anchor body 210 as fluke 220 penetrates the earth formation.
Preferably, the oil through hole 211 may communicate with a rodless chamber of the hydraulic cylinder.
Further, the included angle is preferably 80-100 deg.C, preferably 90 deg.C, so that the longest length of fluke 220 can be achieved, and the longer the length of fluke 220, the deeper the penetration depth into the formation, the better the locking of the formation, and the good seating stability for soft formations.
Because the oil well targeted by the invention is a thick oil well which generally adopts a 7-inch casing, the length of the fluke 220 cannot be infinitely lengthened, therefore, in the embodiment, the ratio of the length of the fluke 220 to the diameter of the anchor body 210 can be 10-17, so that the longest length of the fluke 220 is obtained on the premise that the anchor body 210 can bear high-pressure hydraulic oil in the oil through hole 211, the fluke extends deep into the stratum, and the locking force is improved.
Further, in this embodiment, the diameter of the oil hole 211 is smaller than the inner diameter of the hydraulic cylinder, so that the hydraulic pressure in the oil hole 211 is higher than the hydraulic pressure in the hydraulic cylinder 120, thereby increasing the pushing force of the fluke 220 into the formation.
Further, in this embodiment, the ratio of the bore diameter of the oil passage hole 211 to the inner diameter of the cylinder may be 1. Within this range, the strength of anchor body 210 itself can be secured, and the urging force against fluke 220 can be increased.
After the sleeve of the heavy oil well is fixed, the oil well generally cannot be started, so the earth anchor can be continuously fixed in the stratum, in order to prevent oil liquid in the earth anchor from flowing reversely, a first check valve 130 can be fixedly arranged between the hydraulic cylinder and the oil through hole 211, an inlet of the first check valve 130 is communicated with the hydraulic cylinder 120, and an outlet of the first check valve 130 is communicated with a first end of the oil through hole 211.
Specifically, referring to fig. 4, in this embodiment, the first check valve 130 may include a fixing seat 131, a sealing element 132, and a flow guide seat 134, where the fixing seat 131 is fixed at the bottom of the hydraulic cylinder, a conical hole and a fixing hole are sequentially disposed in the fixing seat 131, diameters of the conical hole are sequentially increased along a direction close to the fixing hole, a small end of the conical hole is communicated with the hydraulic cylinder, the flow guide seat 134 is fixedly installed in the fixing hole, a top end of the sealing element 132 is operably abutted to or separated from an inner wall of the conical hole, a bottom end of the sealing element 132 may vertically slidably pass through a central hole of the flow guide seat 134 to the oil through hole 211, and the flow guide seat 134 is provided with a flow guide hole communicating the conical hole and the oil through hole 211. Therefore, oil can flow into the oil through hole 211 from the cavity of the hydraulic cylinder 120, and the diameter of one end of the sealing element 132 is larger than that of the small end of the conical hole, so that the oil cannot flow into the cavity of the hydraulic cylinder 120 from the oil through hole 211, and the unidirectional movement of the oil is realized.
More specifically, referring to fig. 4, in the present embodiment, the sealing element 132 is sleeved with a first spring 133, a top end of the first spring 133 is fixed to a middle portion of the sealing element 132, a bottom end of the first spring 133 abuts against a top end of the guide seat 134, and the first spring 133 is disposed in the tapered hole. Oil in the rodless cavity of the hydraulic cylinder can enter the conical hole, the sealing element 132 moves downwards under the action of hydraulic pressure of the oil, a gap through which the oil can pass is formed between the conical hole and the sealing element 132, and the oil enters the flow guide hole of the fixed seat 131 from the gap and flows to the bottom of the fluke 220 along the oil through hole 211 communicated with the flow guide hole, so that the fluke 220 is pushed to move outwards. The liquid in the oil hole 211 is compressed with the sealing member 132 and the conical hole to form a seal under high pressure, so that the oil cannot flow into the cavity of the cylinder 120 through the oil hole.
More specifically, the tip of the seal 132 may be tapered. Further, the sealing member 132 may include a conical portion and a cylindrical portion, a large end of the conical portion and the cylindrical portion being integrally connected, a diameter of the large end of the conical portion being larger than a diameter of the cylindrical portion, so that a step may be formed at a connection of the conical portion and the cylindrical portion, and a top end of the first spring 133 may be fixed on the step; the small end of the conical part is inserted into the conical hole, and the diameter of the large end of the conical part is larger than the maximum diameter of the conical hole of the fixed seat 131.
Further, with reference to fig. 1 to 3, in this embodiment, the ground anchor may further include a cementing assembly 300, the cementing assembly 300 includes an outer pipe 310, a lower gap of the outer pipe 310 is sleeved outside the hydraulic cylinder, a portion of a bottom end of the outer pipe 310 outside the hydraulic cylinder is hermetically disposed, a lower periphery of the outer pipe 310 is provided with a first through hole 319, a top end of the outer pipe 310 is fixedly connected with the casing and then placed in the well, cement is pumped into the sleeve after reaching a specified position, the cement in the sleeve enters an annular space formed by the outer pipe 310 and the pushing assembly 100, and enters an annular space between the casing and the formation through the first through hole 319 disposed on the periphery of the outer pipe 310.
Specifically, with reference to fig. 3, in this embodiment, an upper centering sleeve 315 capable of sliding vertically is disposed in the middle of the inner side of the outer tube 310, an insertion hole 315b is disposed in the middle of the bottom end of the upper centering sleeve 315, the top end of the piston 110 of the hydraulic cylinder is inserted into the insertion hole 315b of the upper centering sleeve 315, and an upper diversion hole 315a disposed vertically is disposed outside the end surface of the upper centering sleeve 315, so that the outer tube 310 and the piston 110 of the hydraulic cylinder can be fixedly connected.
More specifically, referring to fig. 3, in order to improve the fixed connection strength between the outer tube 310 and the piston 110 of the hydraulic cylinder, in this embodiment, a lower centering sleeve 316 may be further fixedly disposed in the middle of the inner side of the outer tube 310, the lower centering sleeve 316 is located below the upper centering sleeve 315, a second through hole is disposed in the middle of an end surface of the lower centering sleeve 316, the piston 110 may vertically slidably pass through the second through hole of the lower centering sleeve 316, a bottom end of the lower centering sleeve 316 is pressed against a top end of the cylinder body 120 of the hydraulic cylinder, and a vertically disposed lower diversion hole is disposed on an end surface of the lower centering sleeve 317 disposed between the outer tube 310 and the cylinder body 120 of the hydraulic cylinder.
Specifically, referring to fig. 3, in this embodiment, the outer tube 310 may include a collar 311, an upper tube 312, a lower tube 313 and a lower tube 314 that are sequentially connected from top to bottom, a lower portion of the upper tube 312, the lower tube 313 and the lower tube 314 are all sleeved outside the hydraulic cylinder with a gap therebetween, an upper end of an outer portion of the upper tube 312 is connected to a lower end of an inner side of the collar 311, an upper centering sleeve 315 is vertically slidably disposed inside the upper tube 312, a lower end of an outer portion of the upper tube 312 is connected to an upper end of an inner side of the lower tube 313, the lower centering sleeve 316 is fixedly disposed at a lower end of the inner side of the upper tube 312, a bottom end of the lower tube 314 is disposed in a sealing manner outside the cylinder body 120 of the hydraulic cylinder, and a periphery of the lower tube 314 is provided with a plurality of first through holes 319, which facilitates installation of the upper centering sleeve 315 and the lower centering sleeve 316, and a top end of the connecting tube 311 may be used to be fixedly connected to a bottom portion of the casing.
Still further, in order to allow the cement to pass from the casing into the annular bore between the casing and the formation without backflow, in conjunction with fig. 1-3, in this embodiment the cement assembly 300 may further comprise a second one-way valve 320, the second one-way valve 320 being disposed in the annular cavity between the socket 313 and the cylinder body 120.
Specifically, referring to fig. 3, in the present embodiment, the second check valve 320 may include a fixed plug 321 and an opening plug 322, wherein the fixed plug 321 and the opening plug 322 are both annular, an outer circumferential surface of the fixed plug 321 is fixedly disposed on an inner wall of the socket 313, the fixed plug 321 is disposed at an outer circumference of the cylinder body 120 of the hydraulic cylinder with a gap therebetween, the opening plug 322 is slidably disposed at an outer circumference of the cylinder body 120 of the hydraulic cylinder, the opening plug 322 is disposed at a gap between the socket 313, and a top surface of the opening plug 322 is operatively abutted against or separated from a bottom surface of the fixed plug 321. Pressure is generated on the opening plug 322 in the process that cement in the cavity between the bearing pipe 313 and the hydraulic cylinder 120 moves downwards, and the opening plug 322 can move downwards under the action of the pressure, so that a gap for cement to flow is formed between the opening plug 322 and the fixed plug 321 in a separating mode, and the second one-way valve is opened; since the opening plug 322 is disposed at the lower portion of the fixing plug 321, the cement cannot flow backward. The fixing plug 321 can be fixedly connected to the inner wall of the adapting pipe 313 through the snap spring 324, or a step can be generated for different inner diameters of different sections of the adapting pipe 313, the step is used for preventing the fixing plug 321 from moving downwards, the specific connection mode is not limited, and technicians in the field can select the step flexibly. In order to achieve a better sealing effect, a sealing ring may be provided on the outer periphery of the fixed plug 321, or a sealing ring may be provided on the inner wall of the opening plug.
More specifically, referring to fig. 3, in this embodiment, the outer periphery of the cylinder body 120 of the hydraulic cylinder may further be sleeved with a second spring 323, the second spring 323 is disposed in the receiving pipe 313, the ground of the opening plug 322 is pressed against the top end of the second spring 323, and the bottom end of the second spring 323 is fixedly disposed on the outer periphery of the cylinder body 120 of the hydraulic cylinder. When cement is not injected, the opening plug 322 is pressed against the lower surface of the fixing plug 321 by the elastic force of the second spring 323; when cement injection is needed, cement entering between the outer pipe 210 and the pushing assembly 100 firstly enters a gap between the fixing plug 321 and the hydraulic cylinder 120, downward pressure is generated on the upper surface of the opening plug 322, the opening plug 322 moves downwards under the action of the downward pressure so as to generate a gap with the fixing plug 321, and the cement continues to move downwards along the gap between the opening plug 322 and the fixing plug 321 and enters an annular cavity between the casing and the stratum from the through hole. Since the backflow of cement causes the opening plug 322 and the fixing plug 321 to be compressed, the backflow of cement is prevented.
More specifically, referring to fig. 3, a communicating groove is provided on the outer circumference of the fixing plug 322, and a sealing ring may be provided on the groove to enhance the sealing property between the fixing plug 322 and the outer tube 210. The number of the grooves and the number of the sealing rings matched with the grooves can be flexibly selected according to actual needs, and is not specifically limited herein.
Further, referring to fig. 1 and fig. 3, in this embodiment, an upper flow guide ring 317 is fixedly disposed on an inner wall of the adapting pipe 313, the upper flow guide ring 317 is fixedly sleeved on an outer periphery of the cylinder body 120 of the hydraulic cylinder, a bottom end of the second spring is fixedly disposed at a top end of the upper flow guide ring 317, the upper flow guide ring 317 is disposed on a side of the opening plug 322320 close to the anchor body 210, and a flow guide hole is disposed on an end surface of the upper flow guide ring 317, so that cement can flow through.
Of course, the second one-way valve 320 may also be provided in plurality to reduce the risk of unsuccessful cementing of the earth anchor. For example, referring to fig. 3, in this embodiment, two second check valves 320 are provided, the two second check valves 320 are arranged in series, an upper flow guide ring 317 is further provided between the two second check valves 320, the upper flow guide ring 317 is hermetically sleeved on the outer periphery of the cylinder body 120 of the hydraulic cylinder, the outer periphery of the upper flow guide ring 317 and the inner wall of the adapting pipe 313 are hermetically arranged, and referring to fig. 6, a plurality of flow guide holes are provided on the upper flow guide ring 317, so that cement can move downward through the flow guide holes on the upper flow guide ring 317.
Further, referring to fig. 6, in this embodiment, a lower guide ring 318 is further disposed on the inner wall of the adapting pipe 313 in a sealing and fixing manner, the lower guide ring 318 is fixedly and sealingly fitted around the outer circumference of the cylinder body 120 of the hydraulic cylinder, and the lower guide ring 318 is disposed on a side of the two second check valves 320 facing away from each other.
The working principle of the prestressed well completion ground anchor provided by the invention is as follows:
the ground anchor is connected to the lowest end of a sleeve, the ground anchor is lowered into a well to a designed position, cement is added into the sleeve, the cement enters the upper portion of an upper pipe from the bottom of the sleeve, then moves downwards along an annular cavity between a piston and the upper pipe, then moves to an annular space between a lower pipe and a hydraulic cylinder through at least one second check valve, and finally enters an annular space between the sleeve and a stratum from a through hole of the lower pipe, a large rubber plug is put into the sleeve after a designed amount of cement is injected into the annular space, collision pressure is realized after the large rubber plug reaches the designed position, the piston is pushed by pressure to move downwards along the hydraulic cylinder, oil in the hydraulic cylinder enters the oil through the first check valve, and therefore the thrust of the piston is converted into hydraulic pressure, and an anchor claw is pushed out and goes deep into the stratum.
The prestressed well completion ground anchor provided by the invention at least has the following advantages:
1. the cross section of a fluid flow passage is changed, namely, the fluid enters the oil through hole with a small cross section from the hydraulic cylinder with a large cross section to increase the fluid pressure, so that the pushing force of inserting the fluke into the stratum is increased, and the fluke can be ensured to be deep into the stratum in a hard stratum.
2. The through hole adjusts the angle between the anchor fluke and the hydraulic cylinder to guarantee the length of the anchor fluke to the maximum extent, thereby improving the depth of the anchor fluke penetrating into the stratum, improving the reliability of anchoring and adapting to different types of stratums.
3. The bottom end of the hydraulic cylinder is provided with a first check valve which can prevent oil from flowing backwards and realize locking of the anchor fluke, so that the aim of anchoring the casing is fulfilled, and at the moment, the wellhead can implement lifting prestressed well completion.
4. The prestressed well completion ground anchor provided by the invention is simple to operate, has large anchoring force, can be suitable for different stratums in the using process, overcomes the defect that the size and the structure of a tool need to be adjusted aiming at stratums with different hardness in the past, can greatly improve the anchoring reliability, and has very great practical benefit along with the gradual and deep expansion of the development of thickened oil.
5. The device has no complex operation, does not influence well cementation construction, and does not additionally increase working procedures.
The prestressed well completion ground anchor provided by the invention is applied to Liaohe oil field for 2 wells (Du 84-51-77 and Du 84-53-77), is pressed to 10MPa, can be anchored after stabilizing the pressure for 3min, and is lifted for 60t for anchoring at one time.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (17)
1. A pre-stressed completion earth anchor, wherein the earth anchor comprises:
a push assembly comprising a hydraulic cylinder;
the anchoring assembly comprises an anchor body, the top end of the anchor body is connected with the bottom end of the hydraulic cylinder, an oil through hole and a plurality of mounting holes are formed in the anchor body, the oil through hole and the mounting holes are respectively provided with a first end and a second end, the first end of the oil through hole is communicated with the hydraulic cylinder, the second end of the oil through hole is arranged in a sealing mode, each mounting hole is formed in the anchor body, the first end of the mounting hole is communicated with the middle of the oil through hole, the second end of the mounting hole extends to the peripheral surface of the anchor body, and an anchor claw capable of extending out of the mounting hole is arranged in each mounting hole;
the central axis of the anchor fluke is intersected with the central axis of the anchor body, and the included angle between the central axis of the anchor fluke and the central axis of the hydraulic cylinder is 65-120 degrees.
2. A prestressed completion ground anchor according to claim 1, wherein said included angle is 80-100 °.
3. A prestressed completion ground anchor according to claim 2, wherein the ratio of the length of said fluke to the diameter of said anchor body is 10-17.
4. The pre-stressed completion ground anchor of claim 1, wherein the bore diameter of said oil passage is smaller than the inner diameter of said hydraulic cylinder.
5. The prestressed completion ground anchor of claim 2, wherein the ratio of the bore diameter of said oil through hole to the inner diameter of said hydraulic cylinder is 1.
6. The prestressed well completion ground anchor of claim 1, wherein a first check valve is fixedly arranged between said hydraulic cylinder and said oil through hole, an inlet of said first check valve is communicated with said hydraulic cylinder, and an outlet of said first check valve is communicated with a first end of said oil through hole.
7. The pre-stressed completion ground anchor of claim 6, wherein the first one-way valve comprises a fixed seat, a sealing member and a deflector seat, wherein,
the fixed seat is fixed at the bottom of the hydraulic cylinder, a conical hole and a fixed hole which are communicated are sequentially arranged in the fixed seat, the small end of the conical hole is communicated with the hydraulic cylinder, the flow guide seat is fixedly arranged in the fixed hole, the top end of the sealing element is operably propped against or separated from the inner wall of the conical hole, the bottom end of the sealing element can vertically and slidably penetrate through the central hole of the flow guide seat to the oil through hole,
and the flow guide seat is provided with a flow guide hole for communicating the conical surface hole and the oil through hole.
8. The pre-stressed completion ground anchor of claim 7, wherein the sealing member is sleeved with a first spring, the top end of the first spring is fixed in the middle of the sealing member, the bottom end of the first spring is pressed against the top end of the diversion seat, and the first spring is disposed in the tapered hole.
9. A prestressed completion ground anchor according to claim 7, wherein the apex of said seal is tapered.
10. The ground anchor for prestressed well completion according to any one of claims 1-9, wherein said ground anchor further comprises a cementing assembly, said cementing assembly comprises an outer tube, the lower portion of said outer tube is gap-sleeved outside said hydraulic cylinder, the bottom end of said outer tube is disposed at the portion outside said hydraulic cylinder in a sealing manner, and the periphery of the lower portion of said outer tube is provided with a first through hole.
11. The prestressed well completion ground anchor according to claim 10, wherein the inner middle part of the outer pipe is provided with an upper centering sleeve capable of sliding vertically, the middle part of the bottom end of the upper centering sleeve is provided with an embedding hole, the top end of the piston of the hydraulic cylinder is embedded into the embedding hole of the upper centering sleeve, the outer part of the end surface of the upper centering sleeve is provided with an upper guide hole vertically arranged, and the upper guide hole is positioned outside the embedding hole.
12. The prestressed well completion ground anchor according to claim 11, wherein a lower centering sleeve is fixedly arranged in the middle of the inner side of the outer tube, the lower centering sleeve is positioned below the upper centering sleeve, a second through hole is arranged in the middle of the end surface of the lower centering sleeve, the piston vertically slidably passes through the second through hole of the lower centering sleeve, the bottom end of the lower centering sleeve is pressed against the top end of the cylinder body of the hydraulic cylinder, and a vertically arranged lower guide hole is arranged in the end surface of the lower centering sleeve arranged between the outer tube and the cylinder body of the hydraulic cylinder.
13. The ground anchor for prestressed well completion according to claim 12, wherein said outer tube comprises a coupling, an upper tube, a socket tube and a lower tube sequentially connected from top to bottom, the lower portion of said upper tube, said socket tube and said lower tube are all sleeved outside said hydraulic cylinder with a gap therebetween, the outer upper end of said upper tube is connected to the inner lower end of said coupling, said upper centering sleeve is vertically slidably disposed inside said upper tube, the outer lower end of said upper tube is connected to the inner upper end of said socket tube, said lower centering sleeve is fixedly disposed at the inner lower end of said upper tube, the bottom end of said lower tube is disposed in a sealing manner at the portion outside the cylinder body of said hydraulic cylinder, and said first through hole is disposed at the outer periphery of said lower tube.
14. The prestressed completion ground anchor of claim 13, wherein said cementing assembly further comprises a second one-way valve disposed within said annular cavity between said bolster and said cylinder body of said hydraulic cylinder.
15. The pre-stressed completion earth anchor of claim 14, wherein the second one-way valve comprises a fixed plug and an opening plug, wherein,
the fixed plug with the opening plug is the annular, the fixed plug is fixed to be set up on the inner wall of adapter, the fixed plug clearance sets up the cylinder body periphery of hydraulic cylinder, the slidable ground of opening the plug sets up on the cylinder body periphery of hydraulic cylinder, the opening plug with the adapter clearance sets up, the top surface of opening the plug operationally with the bottom surface top of fixed plug is leaned on or is separated.
16. The prestressed well completion ground anchor according to claim 15, wherein a second spring is sleeved on the outer periphery of the cylinder body of the hydraulic cylinder, the second spring is arranged in the bearing pipe, the bottom surface of the opening plug is pressed against the top end of the second spring, and the bottom end of the second spring is fixedly arranged on the outer periphery of the cylinder body of the hydraulic cylinder.
17. The prestressed well completion ground anchor according to claim 16, wherein an upper deflector ring is fixedly disposed on the inner wall of said adapting pipe, said upper deflector ring is fixedly disposed on the outer periphery of the cylinder body of said hydraulic cylinder, the bottom end of said second spring is fixedly disposed on the top end of said upper deflector ring, and a deflector hole is disposed on the end surface of said upper deflector ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110826238.XA CN115680530A (en) | 2021-07-21 | 2021-07-21 | Prestressed well completion ground anchor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110826238.XA CN115680530A (en) | 2021-07-21 | 2021-07-21 | Prestressed well completion ground anchor |
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| CN115680530A true CN115680530A (en) | 2023-02-03 |
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| CN202110826238.XA Pending CN115680530A (en) | 2021-07-21 | 2021-07-21 | Prestressed well completion ground anchor |
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| US2381929A (en) * | 1940-09-06 | 1945-08-14 | Schlumberger Marcel | Well conditioning apparatus |
| US2582719A (en) * | 1950-02-01 | 1952-01-15 | Standard Oil Dev Co | Oil well formation tester |
| US2743781A (en) * | 1952-08-25 | 1956-05-01 | Guiberson Corp | Hydraulic anchor tool |
| US5183111A (en) * | 1991-08-20 | 1993-02-02 | Schellstede Herman J | Extended reach penetrating tool and method of forming a radial hole in a well casing |
| CN201963234U (en) * | 2011-03-07 | 2011-09-07 | 中国石油化工股份有限公司 | Hydraulic anchor with inclined anchor fluke |
| CN203362081U (en) * | 2013-07-18 | 2013-12-25 | 陕西鼎和源瑞环境工程有限公司 | Hydraulic type hydraulic anchor |
| CN203729923U (en) * | 2014-01-02 | 2014-07-23 | 中国石油天然气股份有限公司 | Casing anchor |
| CN204186331U (en) * | 2014-10-31 | 2015-03-04 | 克拉玛依市红都有限责任公司 | Hydraulic piston type sand-preventing scale-preventing hydraulic anchor |
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2021
- 2021-07-21 CN CN202110826238.XA patent/CN115680530A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2381929A (en) * | 1940-09-06 | 1945-08-14 | Schlumberger Marcel | Well conditioning apparatus |
| US2582719A (en) * | 1950-02-01 | 1952-01-15 | Standard Oil Dev Co | Oil well formation tester |
| US2743781A (en) * | 1952-08-25 | 1956-05-01 | Guiberson Corp | Hydraulic anchor tool |
| US5183111A (en) * | 1991-08-20 | 1993-02-02 | Schellstede Herman J | Extended reach penetrating tool and method of forming a radial hole in a well casing |
| CN201963234U (en) * | 2011-03-07 | 2011-09-07 | 中国石油化工股份有限公司 | Hydraulic anchor with inclined anchor fluke |
| CN203362081U (en) * | 2013-07-18 | 2013-12-25 | 陕西鼎和源瑞环境工程有限公司 | Hydraulic type hydraulic anchor |
| CN203729923U (en) * | 2014-01-02 | 2014-07-23 | 中国石油天然气股份有限公司 | Casing anchor |
| CN204186331U (en) * | 2014-10-31 | 2015-03-04 | 克拉玛依市红都有限责任公司 | Hydraulic piston type sand-preventing scale-preventing hydraulic anchor |
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