阅读说明：本技术 一种液力锚 (Hydraulic anchor ) 是由 陆华飞 李荣明 孙昌平 李晓彬 于 2019-10-30 设计创作，主要内容包括：本发明涉及一种液力锚,包括中心管以及套设在中心管上的移动组件、锚定组件,锚定组件通过移动组件在中心管的线性移动从而实现对管柱的坐卡以及解卡；移动组件包括依次套设在中心管上的活塞、缸套以及活动锥；锚定组件置于上接头与活动锥之间的空腔内,锚定组件包括玻璃纤维卡瓦、卡簧以及环套,玻璃纤维卡瓦上靠近中心管的端面两侧与活动锥、上接头的锥形面实现齿条配合,玻璃纤维卡瓦靠近卡簧的端面上具有向内凹陷的圆弧面,且卡簧为开口朝向玻璃纤维卡瓦的弧状结构,玻璃纤维卡瓦的圆弧面上具有多个应力释放槽。本发明具有提高结构强度,避免内部结构断裂而造成整个结构的坐卡以及解卡的优点。(The invention relates to a hydraulic anchor, which comprises a central pipe, a moving assembly and an anchoring assembly, wherein the moving assembly and the anchoring assembly are sleeved on the central pipe; the moving assembly comprises a piston, a cylinder sleeve and a moving cone which are sequentially sleeved on the central pipe; the anchor assembly is arranged in a cavity between the upper joint and the movable cone and comprises a glass fiber slip, clamp springs and a ring sleeve, wherein the two sides of the end surface of the glass fiber slip, which is close to the central pipe, are matched with the movable cone and the conical surface of the upper joint through racks, an inward concave arc surface is arranged on the end surface of the glass fiber slip, which is close to the clamp springs, the clamp springs are of an arc-shaped structure with openings facing the glass fiber slip, and a plurality of stress release grooves are formed in the arc surface of the glass fiber slip. The invention has the advantages of improving the structural strength and avoiding the clamping and releasing of the whole structure caused by the fracture of the internal structure.)

1. A hydraulic anchor, characterized by: the anchoring assembly linearly moves on the central pipe (1) through the moving assembly, so that a pipe column can be clamped and unlocked;

the movable assembly comprises a piston (2), a cylinder sleeve (3) and a movable cone (4) which are sequentially sleeved on a central pipe (1), an upper connector (5) is further sleeved at one end of the central pipe (1), the piston (2) and the movable cone (4) are respectively clamped at two sides of the cylinder sleeve (3), the piston (2) pushes the movable cone (4) to linearly move on the central pipe (1) along the extending direction of the central pipe (1), the upper connector (5) and the movable cone (4) are correspondingly arranged, the opposite end faces of the upper connector (5) and the movable cone (4) form a conical surface (6), a water injection hole (7) is formed between the piston (2) and the cylinder sleeve (3), and a shear pin (8) is further arranged between the piston (2) and the cylinder sleeve (3);

the anchoring assembly is arranged in a cavity (9) between an upper joint (5) and a movable cone (4) and comprises a glass fiber slip (10), a clamp spring (11) and a ring sleeve (12), the clamp spring (11) is arranged between the glass fiber slip (10) and the ring sleeve (12), two ends of the ring sleeve (12) are respectively connected with the upper joint (5) and the movable cone (4), two sides of the end surface, close to a central pipe (1), of the glass fiber slip (10) are in rack fit with conical surfaces (6) of the movable cone (4) and the upper joint (5), two sides of the glass fiber slip (10) move on the conical surfaces (6) along with the linear movement of the movable cone (4), an inward concave arc surface (13) is arranged on the end surface, close to the clamp spring (11), of the glass fiber slip (10), and the clamp spring (11) is of an arc-shaped structure with an opening facing towards the glass fiber slip (10), the arc surface (13) of the glass fiber slip (10) is provided with a plurality of stress release grooves (14), and the stress release grooves (14) are distributed along the outer circumference of the glass fiber slip (10) in an equal circumference mode.

2. A hydraulic anchor as claimed in claim 1, wherein: stress release groove (14) are including the first cell body (15), second cell body (16), third cell body (17) that connect gradually, first cell body (15), second cell body (16), third cell body (17) all incline to the central axis of glass fiber slips (10) and extend along the direction of top connection (5) to activity awl (4), first cell body (15) become the axisymmetric setting with second cell body (16), second cell body (16) are the axisymmetric setting with third cell body (17).

3. A hydraulic anchor as claimed in claim 2, wherein: and 60-degree included angles are formed between the first groove body (15) and the second groove body (16) and between the second groove body (16) and the third groove body (17).

4. A hydraulic anchor according to claim 3, wherein: the glass fiber slip (10) comprises the following components in percentage by weight: 80-100 parts of glass fiber powder, 50-80 parts of ethylene propylene diene monomer, 10-15 parts of polyamide resin, 5-10 parts of potassium acetate solution, 1-2 parts of defoaming agent and 10-20 parts of curing agent;

the manufacturing steps of the glass fiber slip (10) are as follows:

A. mixing glass fiber powder: mixing the glass fiber powder with the proportion into a potassium acetate solution, stirring, and putting into an oven for drying;

B. preheating: preheating ethylene propylene diene monomer and polyamide resin for 20-25min at the preheating temperature of 65-75 ℃, adding a defoaming agent and the glass fiber powder prepared in the step A, stirring for 15-20min by a stirrer to obtain a mixed solution, and adding a curing agent into the mixed solution to obtain a casting solution of gold;

C. injection molding: and (4) placing the casting liquid into an injection molding machine for molding to obtain the glass fiber slip.

5. A hydraulic anchor according to claim 4, wherein: the two ends of the glass fiber slip (10) are respectively provided with a boss (18) with a side end of a clamp spring (11) for limiting, the clamp spring (11) comprises an arc part (19) with an opening facing the glass fiber slip (10) and horizontal parts (20) respectively arranged on two sides of the arc part (19), and the thickness of the arc part (19) is gradually reduced from the center to the two sides.

6. A hydraulic anchor according to claim 5, wherein: the clamp spring (11) is a plastic part.

7. A hydraulic anchor as claimed in claim 1, wherein: the moving assembly further comprises a lower joint (21) and a pressing cap (22), the lower joint (21) is sleeved on one end, far away from the upper joint (5), of the central pipe (1), the pressing cap (22) is connected with the cylinder sleeve (3), the pressing cap (22) is connected with the piston (2) through a reset spring (23), and an anti-collision ring (24) is arranged between the lower joint (21) and the connecting part of the central pipe (1).

The technical field is as follows:

the invention belongs to the field of mechanical oil extraction of oil fields, and particularly relates to a hydraulic anchor.

Background art:

the oil well is mostly a rod type oil pumping well, the load of the liquid column is born by the oil pumping rod when the oil pumping pipe column of the oil well is in the upward stroke of the oil pumping process, and the load of the liquid column is born by the oil pumping pipe column when the oil well is in the downward stroke, so the oil pumping pipe column bears the alternating load, under the action of the alternating load, the oil pumping pipe column is extended and shortened along with the change of the upward stroke and the downward stroke, the extension and the shortening of the oil pumping pipe column reduce the pumping effect of the oil well pump on the one hand, and on the other hand, the working reliability of. The existing method for solving the problem of the extension and the shortening of the oil pumping pipe column is to adopt an anchoring device, and the anchoring device anchors the oil pumping pipe column on a casing pipe, so that the oil pumping pipe column does not extend and shorten along with the change of the up-down stroke.

The slips of current hydraulic anchor is receiving the promotion of activity awl, it is whole atress unbalanced when bearing the axial force, this moment under the extrusion that receives the ring sleeve, the slips becomes C font easily and opens, the slips produces local stress concentration, influence the structural strength of slips, and current slips adopts metal construction mostly, very easily take place the fracture in stress concentration department, also there is glass fiber cloth to lay on the surface of metal slips at present to avoid its fracture, but unable fundamentally solves the internal stress concentration problem, and effectively prevent cracked phenomenon, the seat card and the unfreezing of whole hydraulic anchor structure are influenced.

The invention content is as follows:

the invention aims to overcome the defects and provide a hydraulic anchor, which improves the structural strength and avoids the clamping and releasing of the whole structure caused by the fracture of the internal structure.

The purpose of the invention is realized by the following technical scheme: a hydraulic anchor comprises a central tube, a moving assembly and an anchoring assembly, wherein the moving assembly and the anchoring assembly are sleeved on the central tube;

the moving assembly comprises a piston, a cylinder sleeve and a movable cone which are sequentially sleeved on a central pipe, an upper connector is further sleeved at one end of the central pipe, the piston and the movable cone are respectively clamped at two sides of the cylinder sleeve, the piston pushes the movable cone to linearly move on the central pipe along the extending direction of the central pipe, the upper connector is arranged corresponding to the movable cone, the end faces of the upper connector and the movable cone, which face each other, form a conical surface, a water injection hole is formed between the piston and the cylinder sleeve, and a shear pin is further arranged between the piston and the cylinder sleeve;

the anchoring assembly is arranged in a cavity between the upper joint and the movable cone, the anchoring assembly comprises a glass fiber slip, a clamp spring and a ring sleeve, the clamp spring is arranged between the glass fiber slip and the ring sleeve, two ends of the ring sleeve are respectively connected with the upper joint and the movable cone, two sides of the end surface, close to the central pipe, of the glass fiber slip are in rack fit with the movable cone, the conical surface of the upper joint is in rack fit, two sides of the glass fiber slip move on the conical surface along with the linear movement of the movable cone, an inward concave arc surface is arranged on the end surface, close to the clamp spring, of the glass fiber slip, the clamp spring is of an arc-shaped structure with an opening facing the glass fiber slip, a plurality of stress releasing grooves are formed in the arc surface of the glass fiber slip, and the stress releasing grooves are distributed along the outer circumference.

The invention is further improved in that: the stress release groove comprises a first groove body, a second groove body and a third groove body which are connected in sequence, the first groove body, the second groove body and the third groove body are all inclined to the central axis of the glass fiber slip and extend along the direction from the upper joint to the movable cone, the first groove body and the second groove body are arranged in an axial symmetry mode, and the second groove body and the third groove body are arranged in an axial symmetry mode.

The invention is further improved in that: an included angle of 60 degrees is formed between the first groove body and the second groove body and between the second groove body and the third groove body.

The invention is further improved in that: the glass fiber slip consists of the following components in percentage by weight: 80-100 parts of glass fiber powder, 50-80 parts of ethylene propylene diene monomer, 10-15 parts of polyamide resin, 5-10 parts of potassium acetate solution, 1-2 parts of defoaming agent and 10-20 parts of curing agent;

the manufacturing steps of the glass fiber slip are as follows:

A. mixing glass fiber powder: mixing the glass fiber powder with the proportion into a potassium acetate solution, stirring, and putting into an oven for drying;

B. preheating: preheating ethylene propylene diene monomer and polyamide resin for 20-25min at the preheating temperature of 65-75 ℃, adding a defoaming agent and the glass fiber powder prepared in the step A, stirring for 15-20min by a stirrer to obtain a mixed solution, and adding a curing agent into the mixed solution to obtain a casting solution of gold;

C. injection molding: placing the casting liquid into an injection molding machine for molding to obtain a glass fiber slip;

the invention is further improved in that: the two ends of the glass fiber slip are respectively provided with a boss for limiting the lateral ends of the clamp springs, each clamp spring comprises an arc part with an opening facing the glass fiber slip and horizontal parts respectively arranged on two sides of each arc part, and the thickness of each arc part is gradually reduced from the center to two sides.

The invention is further improved in that: the clamp spring is a plastic part.

The invention is further improved in that: the moving assembly further comprises a lower joint and a pressing cap, the lower joint is sleeved on one end, far away from the upper joint, of the central pipe, the pressing cap is connected with the cylinder sleeve, the pressing cap is connected with the piston through a return spring, and an anti-collision ring is arranged between the lower joint and the connecting position of the central pipe.

Compared with the prior art, the invention has the following advantages:

the slips of the invention improves the structural strength of the slips through a specially-made glass fiber structure, the end surface of the slips is provided with an inward-concave arc surface, the arc surface is provided with a plurality of stress release grooves, and the arrangement of the arc surface prevents the slips from forming C-shaped bending when being pushed by a movable cone and subjected to the extrusion force of a ring sleeve, thereby effectively releasing local concentrated stress generated by the slips and preventing the slips from being broken due to stress concentration.

Description of the drawings:

fig. 1 is a schematic structural view of a hydraulic anchor according to the present invention.

Fig. 2 is an enlarged partial view of an anchor assembly of a hydraulic anchor of the present invention.

FIG. 3 is a schematic structural diagram of a stress relief groove of a hydraulic anchor according to the present invention.

Fig. 4 is a schematic structural view of a clamp spring of a hydraulic anchor according to the present invention.

Reference numbers in the figures: 1-central tube, 2-piston, 3-cylinder sleeve, 4-movable cone, 5-upper joint, 6-conical surface, 7-water injection hole, 8-shear pin, 9-cavity, 10-glass fiber slip, 11-snap spring, 12-ring sleeve, 13-circular surface, 14-stress release groove, 15-first groove body, 16-second groove body, 17-third groove body, 18-boss, 19-arc part, 20-horizontal part, 21-lower joint, 22-pressing cap, 23-reset spring and 24-anti-collision ring.

The specific implementation mode is as follows:

for the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

Fig. 1 shows an embodiment of a hydraulic anchor of the present invention, which includes a central pipe 1, and a moving assembly and an anchoring assembly sleeved on the central pipe 1, wherein the anchoring assembly realizes setting and releasing of a tubular string by linear movement of the moving assembly on the central pipe 1;

the moving assembly comprises a piston 2, a cylinder sleeve 3 and a movable cone 4 which are sequentially sleeved on a central tube 1, an upper joint 5 is further sleeved at one end of the central tube 1, the piston 2 and the movable cone 4 are respectively clamped at two sides of the cylinder sleeve 3, the piston 2 pushes the movable cone 4 to linearly move on the central tube 1 along the extending direction of the central tube 1, the upper joint 5 is arranged corresponding to the movable cone 4, the opposite end surfaces of the upper joint 5 and the movable cone 4 form a conical surface 6, a water injection hole 7 is formed between the piston 2 and the cylinder sleeve 3, and a shear pin 8 is further arranged between the piston 2 and the cylinder sleeve 3;

as shown in fig. 2, the anchoring assembly is arranged in the cavity 9 between the upper joint 5 and the movable cone 4, the anchoring assembly comprises a glass fiber slip 10, a clamp spring 11 and a ring sleeve 12, the clamp spring 11 is arranged between the glass fiber slip 10 and the ring sleeve 12, two ends of the ring sleeve 12 are respectively connected with the upper joint 5 and the movable cone 4, two sides of the end surface of the glass fiber slip 10 close to the central tube 1 are in rack fit with the movable cone 4 and the conical surface 6 of the upper joint 5, and the two sides of the glass fiber slip 10 move on the conical surface 6 along with the linear movement of the movable cone 4, the end surface of the glass fiber slip 10 close to the clamp spring 11 is provided with an inward concave arc surface 13, the clamp spring 11 is an arc structure with an opening facing the glass fiber slip 10, the arc surface 13 of the glass fiber slip 10 is provided with a plurality of stress release grooves 14, and the stress release grooves 14 are distributed along the outer circumference of the glass fiber slip 10 in an equal circumference manner.

The working principle is as follows: injecting high-pressure water into the water injection hole 7, forming pressure between the piston 2 and the cylinder sleeve 3, shearing the shear pin 8 under the action of high pressure, pushing the movable cone 4 to go upwards, shortening the distance between the upper joint 5 and the movable cone 4, pushing the ring sleeve 12 to move outwards by the glass fiber slips 10 and the snap spring 11, and firmly clamping the ring sleeve on the casing pipe, so that the oil pumping pipe column is fixed on the casing pipe; when the pressure disappears, the movable cone 4 descends under the action of the return spring 23, the distance between the movable cone 4 and the upper joint 5 is increased, the glass fiber slips 10 and the snap spring 11 are retracted, the release of the anchoring device of the oil pumping pipe column is completed, the oil pumping pipe column is smoothly lifted, the increase and the reduction of the pressure can be manually realized by the outside, the action of the traditional pin and the lock ring is changed, the double structure of the return spring 23 and the snap spring 11 can realize repeated anchoring and release, and the utilization rate of the device is improved; the two ends of the glass fiber slip 10 are respectively provided with a bulge 14, a snap spring 11 is arranged between the glass fiber slip 10 and the ring sleeve 12, and the ring sleeve 12 is sleeved outside the snap spring 11 to play a role of preventing sand from being blocked.

In the process of setting the slips, the glass fiber slips 10 and the clamp spring 11 push the ring sleeve 12 to move outwards, at the moment, the ring sleeve 12 generates force reverse thrust on the clamp spring 11 and the glass fiber slips 10, two ends of the clamp spring 11 are limited in the bulges 14 at two ends of the glass fiber slips 10, at the moment, two ends of the glass fiber slips 10 are squeezed by the clamp spring 11 and the ring sleeve 12, at the moment, the glass fiber slips 10 are integrally stressed unevenly under axial force, the glass fiber slips 10 are easy to open in a C shape, and the slips generate local stress concentration, the slips of the invention improve the structural strength of the slips through a special glass fiber structure, an inward concave arc surface 13 is arranged on the end surface of the slips, a plurality of stress release grooves 14 are arranged on the arc surface 13, and when the glass fiber slips are pushed by the movable cone 4 and are squeezed by the ring sleeve 12, the C-shaped bending is avoided, the local concentrated stress generated by the glass fiber slip 10 is effectively released, the glass fiber slip 10 is prevented from being broken due to stress concentration, and the technical problem is effectively solved.

On the basis of the present embodiment, as shown in fig. 3, the stress relief groove 14 includes a first groove body 15, a second groove body 16, and a third groove body 17 that are connected in sequence, the first groove body 15, the second groove body 16, and the third groove body 17 are all inclined to the central axis of the glass fiber slip 10 and extend along the direction from the upper joint 5 to the movable cone 4, the first groove body 15 and the second groove body 16 are disposed in an axisymmetric manner, and the second groove body 16 and the third groove body 17 are disposed in an axisymmetric manner.

Further, an included angle of 60 degrees is formed between the first groove body 15 and the second groove body 16, and between the second groove body 16 and the third groove body 17.

Further, the glass fiber slip 10 is composed of the following components by weight percent: 80-100 parts of glass fiber powder, 50-80 parts of ethylene propylene diene monomer, 10-15 parts of polyamide resin, 5-10 parts of potassium acetate solution, 1-2 parts of defoaming agent and 10-20 parts of curing agent;

the glass fiber slip 10 is produced by the following steps:

A. mixing glass fiber powder: mixing the glass fiber powder with the proportion into a potassium acetate solution, stirring, and putting into an oven for drying;

B. preheating: preheating ethylene propylene diene monomer and polyamide resin for 20-25min at the preheating temperature of 65-75 ℃, adding a defoaming agent and the glass fiber powder prepared in the step A, stirring for 15-20min by a stirrer to obtain a mixed solution, and adding a curing agent into the mixed solution to obtain a casting solution of gold;

C. injection molding: placing the casting liquid into an injection molding machine for molding to obtain a glass fiber slip;

as shown in fig. 4, the two ends of the glass fiber slip 10 are respectively provided with a boss 18 for limiting the position of the side end of the clamp spring 11, the clamp spring 11 comprises an arc part 19 with an opening facing the glass fiber slip 10 and horizontal parts 20 respectively arranged at the two sides of the arc part 19, and the thickness of the arc part 19 is gradually reduced from the center to the two sides.

When stress concentration is generated in the glass fiber slip 10, the stress concentrated in the glass fiber slip is released to the stress release groove 14, the glass fiber slip 10 prepared by the formula and the process steps can eliminate shear stress, extra freedom degree is added in the glass fiber slip, stiffness generated in a bay area due to Poisson effect can be eliminated, the structural strength of the glass fiber slip is improved, and the setting force of the hydraulic anchor on a pipe column is improved; the stress relief groove 14 of the invention enables the stress to be dispersed around along with the groove body structure, even if the second groove body 16 at the middle part is dispersed along with the inclination angle of the groove body, the glass fiber slip 10 can resist the pressure difference in the pipe of 95MPa due to the change of the material of the glass fiber slip and the combination of the stress relief groove 14, while the existing structure of laying glass fiber cloth on the surface of the metal slip can resist the pressure difference in the pipe of 60-80MPa, therefore, the invention has obvious progress in solving the slip stress.

On the basis of this embodiment, jump ring 11 is the plastic part, can send elastic deformation, is convenient for realize repeatedly sitting the card and unfreezing.

On the basis of this embodiment, the movable assembly further includes a lower joint 21 and a pressure cap 22, the lower joint 21 is sleeved on one end of the central tube 1 far from the upper joint 5, the pressure cap 22 is connected with the cylinder sleeve 3, the pressure cap 22 is connected with the piston 2 through a return spring 23, and an anti-collision ring 24 is arranged between the lower joint 21 and the connecting part of the central tube 1.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.