CN113790041A

CN113790041A - Multifunctional pumping aid with righting function

Info

Publication number: CN113790041A
Application number: CN202111091008.XA
Authority: CN
Inventors: 陈少侠
Original assignee: Jiangtian Technology Co ltd
Current assignee: Jiangtian Technology Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-12-14
Anticipated expiration: 2041-09-17
Also published as: CN113790041B

Abstract

The invention belongs to the field of downhole tools in oil fields, and particularly relates to a multifunctional pumping aid with a centralizing function, which comprises a shell and a one-way valve arranged in the shell, wherein liquid passing holes communicated with the spaces at the inner side and the outer side of the shell are respectively and correspondingly arranged on the shell and the upper side and the lower side of the one-way valve; an annular groove is processed on the outer side of the shell and is called as an open ring mounting groove, and an open ring is mounted in the open ring mounting groove; the bottom of the split ring mounting groove is provided with a radial through hole penetrating through the inside and the outside of the shell, the radial through hole is called a wedge block mounting hole, a wedge block capable of sliding along the radial direction of the shell is mounted in the wedge block mounting hole, and one end of the wedge block protrudes out of the bottom of the split ring mounting groove and is wedged into the opening of the split ring. The invention forces the wedge block to move outwards along the radial direction of the shell and further wedges into the opening of the split ring through the guiding conical surface on the valve body, so that the diameter of the split ring can be further enlarged, and the abrasion of the outer circumference of the split ring is compensated.

Description

Multifunctional pumping aid with righting function

Technical Field

The invention belongs to the field of oil field downhole tools, and particularly relates to a multifunctional pumping aid with a centralizing function.

Background

In an oil pumping unit system of an oil field, a pumping aid is a tool which can effectively improve the oil extraction efficiency. The traditional pumping aid is very simple in principle, the outer diameter of the pumping aid is slightly smaller than the inner diameter of an underground oil pipe, and a one-way valve which is communicated upwards in one way is arranged inside the pumping aid. When the pumping aid is used, the pumping aid is connected on the sucker rod in series, and when the sucker rod goes down, liquid in the sucker rod flows upwards through the one-way valve, so that the liquid in the well is lifted to the ground; when the sucker rod goes upward, the one-way valve is closed, and the pumping aid moving upward along with the sucker rod and the oil pipe jointly form a negative pressure pumping mechanism, so that the load of the oil well pump is reduced, the pump efficiency of the oil well pump is improved, and the pumping aid is achieved. In the prior art, the pumping aid mostly adopts the above structure, for example, an oil well pump centering and pumping aid device with the patent number of CN200720029560.5 applied by the oil field division of Shengli, petrochemical industry, sand-lifting and pumping aid sucker rod centering aid device with the patent number of CN2012206328923 applied by Wujing, a pumping aid device with the patent number of CN2014205074577 applied by Huiwenweimin and Guo Shi.

The problems in the use of the existing pumping aid are as follows: when the pumping aid works, the outer wall of the pumping aid needs to be in repeated friction contact with the inner wall of an oil pipe for a long time, so that the outer wall of the pumping aid is abraded quickly, the pumping aid effect is gradually reduced along with the abrasion of the outer wall of the pumping aid, the obvious pumping aid effect cannot be generated, a new pumping aid needs to be replaced at the moment, the production stop construction is needed for replacing the pumping aid, a large amount of operating equipment, vehicles and personnel need to be used, and the replacement cost is very high. Therefore, a new pumping aid with a longer service life and capable of continuously playing a good pumping aid role is needed to be designed.

Disclosure of Invention

The invention provides a multifunctional pumping aid with a centralizing function, which can make the pumping aid play a good pumping-aid role more durably by automatically compensating the abrasion loss, and prolong the service life of the pumping aid.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the invention comprises a shell and a one-way valve arranged in the shell, wherein liquid passing holes communicated with the space at the inner side and the outer side of the shell are respectively arranged on the shell and the upper side and the lower side of the one-way valve correspondingly;

an annular groove is processed on the outer side of the shell and is called as an open ring mounting groove, and an open ring is mounted in the open ring mounting groove;

a radial through hole penetrating through the inside and the outside of the shell is processed at the bottom of the split ring mounting groove and is called a wedge block mounting hole, a wedge block capable of sliding along the radial direction of the shell is mounted in the wedge block mounting hole, one end of the wedge block protrudes out of the bottom of the split ring mounting groove and is wedged into the opening of the split ring, and the other end of the wedge block protrudes out of the inner wall of the shell;

the size of the split ring mounting groove is equal to the size of the wedge block mounting hole in the axial direction of the housing, and at the same time, the size of the split ring is equal to the size of the wedge block;

the check valve comprises a valve seat and a valve ball, the valve seat is slidably mounted in the shell, and a spherical surface on the valve ball is matched with a conical sealing surface processed on the inner side of the valve seat to form the check valve which is communicated in an upward one-way manner;

the outer side of the valve seat is provided with a guide conical surface with a downward small end, and the wedge block is abutted against the guide conical surface.

Preferably, the guide conical surface is step-shaped, the steps are formed by alternately arranging conical surfaces with two tapers, the conical surfaces with the two tapers are respectively called as a locking surface and a guide surface, wherein the taper values of the locking surfaces are the same and not more than 2, and the taper values of the guide surfaces are the same and not less than 2.

As the preferred scheme, the outside processing of disk seat lower extreme has the annular groove, is called the jump ring mounting groove, installs the stopping jump ring in the jump ring mounting groove, the outside of stopping jump ring with the inboard of casing is processed respectively and is had the one-way stopping screw thread of mutually supporting.

Preferably, the wear resistance of the wedge is weaker than that of the split ring.

Preferably, the open ring is made of beryllium bronze.

Preferably, the outer diameter of the split ring is smaller than the inner diameter of the oil pipe in a natural state.

As a preferred scheme, the side wall of the shell is also provided with another two radial through holes which are called as supporting block mounting holes, and the two supporting block mounting holes and the wedge block mounting hole are positioned on the same section of the shell and are uniformly distributed along the circumference;

the supporting block mounting hole is internally provided with a supporting block which can slide along the radial direction of the shell, one end of the supporting block is propped against the guide conical surface, and the other end of the supporting block is propped against the inner side of the split ring.

The invention has the beneficial effects that:

1. the invention uses the sealing mode of sealing between the piston and the cylinder body by adopting the piston ring in the automobile internal combustion engine for reference, by arranging the split ring at the outer side of the pumping aid shell, on one hand, the gap between the pumping aid shell and the inner wall of the oil pipe can be reduced, the sealing performance of the gap is improved, and the liquid leakage quantity of the gap is reduced, so that the negative pressure pumping capacity of the pumping aid is effectively improved, the pumping aid effect is improved, on the other hand, after the split ring is worn, the wedge blocks are forced to move outwards along the radial direction of the shell body by the guiding conical surface on the valve body and are further wedged into the opening of the split ring, so that the diameter of the split ring can be further enlarged, thereby compensating the abrasion of the outer circumference of the split ring and reducing the clearance between the outer circumference of the split ring and the inner wall of the oil pipe again, therefore, the negative pressure suction capacity of the suction aid is recovered, and the service life of the suction aid is prolonged manyfold.

2. The special design of the split ring enables the invention to have a pumping-assisting function and a righting function, and the righting effect is far better than that of the existing righting device. Particularly, the split ring and the shell are completely centered by the three-point support consisting of the two support blocks and the wedge block, and meanwhile, the gap between the split ring and the inner wall of the oil pipe is far smaller than the gap between the centralizer and the inner wall of the oil pipe in the prior art, so that the centralizer can provide an excellent centralizing effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view at A in FIG. 1;

FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

FIG. 5 is an enlarged view of a portion of FIG. 3 at C;

FIG. 6 is a schematic structural view of a third embodiment of the present invention;

fig. 7 is a schematic structural diagram of a fourth embodiment of the present invention.

In the figure: 1. the hydraulic stop valve comprises a shell, 2 parts of a liquid passing hole, 3 parts of a valve seat, 4 parts of a guide conical surface, 5 parts of a split ring, 6 parts of a valve ball, 7 parts of a wedge block, 8 parts of a stop snap spring, 9 parts of a one-way stop thread, 10 parts of a locking surface, 11 parts of a guide surface, 12 parts of a supporting block.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

the first embodiment is as follows:

as shown in fig. 1, the present embodiment includes a casing 1 and a check valve disposed inside the casing 1, wherein liquid passing holes 2 communicating the inner and outer spaces of the casing 1 are respectively disposed on the casing 1 and corresponding to the upper and lower sides of the check valve. The above is a conventional structure in the prior art, and is not described in detail herein.

As shown in fig. 1 and 2, the innovation of the invention is that an annular groove is processed on the outer side of the housing 1, the annular groove is called as an open ring installation groove, an open ring 5 is installed in the open ring installation groove, and in a natural state, the outer diameter of the open ring 5 is smaller than the inner diameter of an oil pipe, so that the arrangement can reduce the abrasion of the open ring 5 in the ascending process of the sucker rod.

The bottom of the split ring mounting groove is provided with a radial through hole which penetrates through the inside and the outside of the shell 1 and is called a wedge block 7 mounting hole, a wedge block 7 which can slide along the radial direction of the shell 1 is mounted in the wedge block 7 mounting hole, one end of the wedge block 7 protrudes out of the bottom of the split ring mounting groove and is wedged into the opening of the split ring 5, and the other end of the wedge block 7 protrudes out of the inner wall of the shell 1.

In the structure, the outer circumference of the split ring 5 and the arc surface on the outer side of the wedge 7 are spliced into a complete cylindrical surface, so that the gap between the wedge 7 and the inner wall of the oil pipe is equal to the gap between the split ring 5 and the oil pipe. Through setting up split ring 5, can reduce the clearance between help taking out ware casing 1 and the oil pipe inner wall, promote the leakproofness of this clearance department, reduce the liquid leakage volume of this clearance department to effectively improve the negative pressure suction capacity of helping taking out the ware, promote and help taking out the effect. In addition, the arrangement of the split ring 5 enables the invention to simultaneously function as a centralizer.

In the axial direction of the shell 1, the size of the split ring mounting groove is equal to the size of the wedge 7 mounting hole, that is, the groove width of the split ring mounting groove is equal to the width of the wedge 7 mounting hole, so that both the lower side of the wedge 7 and the lower side of the split ring 5 can be attached to the lower groove wall of the split ring mounting groove, and meanwhile, the size of the split ring 5 is equal to the size of the wedge 7, so that the planes of the upper side and the lower side of the wedge 7 are flush with the planes of the upper side and the lower side of the split ring 5, which is favorable for ensuring the sealing performance between the combination of the split ring 5 and the wedge 7 and the shell 1.

As shown in fig. 1, the check valve includes a valve seat 3 and a valve ball 6, and a spherical surface on the valve ball 6 is matched with a conical sealing surface processed on the inner side of the valve seat 3 to form the check valve which is communicated in one direction upwards. The significant difference from the prior art is that the valve seat 3 of the present invention is slidably mounted in the housing 1, and at the same time, the outer side of the valve seat 3 is machined with a guide conical surface 4 with a small end facing downwards, and the wedge 7 is abutted against the guide conical surface 4. After the split ring 5 is worn, the wedge block 7 is forced to move outwards along the radial direction of the shell 1 by the guiding conical surface 4 on the valve body and is further wedged into the opening of the split ring 5, so that the diameter of the split ring 5 can be further enlarged, the abrasion of the outer circumference of the split ring 5 is compensated, and the gap between the outer circumference of the split ring 5 and the inner wall of the oil pipe is reduced again, therefore, the negative pressure suction capacity of the pumping aid is recovered, and the service life of the pumping aid is prolonged exponentially.

It should be noted that, in the process of wearing the outer circumference of the split ring 5, in order to prevent the wedge 7 from protruding out of the outer circumference of the split ring 5 for a long time to damage the inner wall of the oil pipe, the wear resistance of the wedge 7 is preferably weaker than that of the split ring 5, so that when the wedge 7 is further wedged into the opening of the split ring 5 for wear compensation, the wedge 7 protruding out of the outer circumference of the split ring 5 can be worn quickly, so that the outer circumference of the split ring 5 and the arc surface outside the wedge 7 are spliced into a complete cylindrical surface again, which is beneficial to ensuring the sealing performance between the split ring 5 and the inner wall of the oil pipe. The wedge 7 may be made of low-hardness aluminum alloy or hard plastic.

In implementation, the material of the split ring 5 can be beryllium bronze, and the beryllium bronze has high hardness, elastic limit, fatigue limit and wear resistance, and also has good corrosion resistance, and can meet the use requirements of the split ring 5 in the application. In addition, 65Mn is also a preferred choice for the split ring 5 material.

Example two:

the difference between this embodiment and the first embodiment is that the shape of the guiding conical surface 4 is different, and the retaining snap spring 8 and the one-way retaining thread 9 are additionally provided.

As shown in fig. 3 and 4, in the present embodiment, the guiding tapered surface 4 is stepped, and the steps are formed by alternately arranging tapered surfaces with two tapers, which are respectively called as a locking surface 10 and a guiding surface 11, wherein the taper values of the locking surfaces 10 are the same and not greater than 2, and the taper values of the guiding surfaces 11 are the same and not less than 2. The outside processing of disk seat 3 lower extreme has the annular groove, is called the jump ring mounting groove, installs stopping jump ring 8 in the jump ring mounting groove, the outside of stopping jump ring 8 with the inboard of casing 1 is processed respectively and is had one-way stopping screw thread 9 of mutually supporting.

The advantages of this embodiment are: when the sucker rod and the pumping aid go upwards together, the valve seat 3 moves downwards relative to the shell 1 under the action of liquid column pressure. In the position state shown in fig. 4, the wedge 7 is in contact with the locking surface 10, and because the taper of the locking surface 10 is large enough, the horizontal component of the force applied to the wedge 7 from the valve seat 3 is small (even zero if the friction force is considered), so that the contact pressure between the wedge 7 and the split ring 5 and the inner wall of the oil pipe is small, unnecessary abrasion is effectively avoided, and the effective service life of the pumping aid is further prolonged. When the split ring 5 and the wedge 7 are worn to some extent, the wedge 7 is moved upward relative to the valve seat 3, thereby compensating for the amount of wear of the split ring 5. Therefore, the present embodiment can effectively reduce unnecessary wear of the split ring 5.

In the structure, the retaining snap spring 8 and the one-way retaining thread 9 are used for preventing the valve seat 3 from returning upwards again after moving downwards, so that the axial positions of the valve seat 3 and the wedge 7 are ensured to be in a stable interval. The backstop clamp spring 8 and the one-way backstop thread 9 are common structures in downhole tools and are not described again.

It should be noted that the pitch of the one-way retaining thread 9 should be smaller than the axial dimension of the one guide surface 11 so that the axial position of the valve seat 3 and the wedge 7 is within a small interval, and, most preferably, the pitch of the one-way retaining thread 9 is preferably greater than half the axial dimension of the one guide surface 11 so as to provide a certain allowance for extension and retraction of the split ring 5 during the reciprocating motion of the pumping aid, thereby preventing the downhole sand from being hard-ground with the split ring 5 and further delaying the wear of the split ring 5.

Example three:

the present embodiment differs from the other embodiments described above in that: a support block 12 is added.

As shown in fig. 6, another two radial through holes, called as supporting block 12 mounting holes, are further processed on the side wall of the housing 1, and the two supporting block 12 mounting holes and one wedge 7 mounting hole are located on the same cross section of the housing 1 and are uniformly distributed along the circumference; a supporting block 12 which can slide along the radial direction of the shell 1 is arranged in the mounting hole of the supporting block 12, one end of the supporting block 12 is propped against the guiding conical surface 4, and the other end of the supporting block 12 is propped against the inner side of the split ring 5. The support blocks 12 allow the axis of the split ring 5 to coincide with the axis of the housing 1, so that the split ring 5 can exert an optimal righting effect. Meanwhile, the roundness of the split ring 5 after the diameter is increased is higher due to the three-point support consisting of the two support blocks 12 and the wedge block 7, so that the gap between the split ring 5 and the inner wall of the oil pipe is smaller, and the sealing property between the split ring 5 and the inner wall of the oil pipe is further ensured.

Example four:

the present embodiment differs from the second embodiment in that the shape of the guiding cone 4 is different.

As shown in fig. 7, in the present embodiment, the guiding surface 11 of the second embodiment is changed from a conical surface to a cylindrical surface, so that the guiding surface 11 does not apply a radial component to the wedge 7 at all, thereby minimizing unnecessary wear of the split ring 5, but sacrificing a part of the pumping aid effect.

Claims

1. The utility model provides a multi-functional helps takes out ware with function of rightting, includes casing (1) and sets up at the inside check valve of casing (1), corresponds respectively with the upper and lower both sides of check valve on casing (1) and is provided with the liquid hole (2) of crossing in the inside and outside both sides space of intercommunication casing (1), its characterized in that:

an annular groove is processed on the outer side of the shell (1) and is called as an open ring mounting groove, and an open ring (5) is mounted in the open ring mounting groove;

a radial through hole penetrating through the inside and the outside of the shell (1) is processed at the bottom of the split ring mounting groove and is called a wedge block (7) mounting hole, a wedge block (7) capable of sliding along the radial direction of the shell (1) is mounted in the wedge block (7) mounting hole, one end of the wedge block (7) protrudes out of the bottom of the split ring mounting groove and is wedged into an opening of the split ring (5), and the other end of the wedge block (7) protrudes out of the inner wall of the shell (1);

the size of the split ring installation groove is equal to that of the wedge block (7) installation hole in the axial direction of the shell (1), and meanwhile, the size of the split ring (5) is equal to that of the wedge block (7);

the check valve comprises a valve seat (3) and a valve ball (6), the valve seat (3) is slidably mounted in the shell (1), and a spherical surface on the valve ball (6) is matched with a conical sealing surface processed on the inner side of the valve seat (3) to form the check valve which is communicated upwards in a one-way mode;

the outer side of the valve seat (3) is provided with a guide conical surface (4) with a downward small end, and the wedge block (7) is abutted against the guide conical surface (4).

2. The multifunctional suction aid with the function of righting according to claim 1, characterized in that: the guide conical surface (4) is step-shaped, the steps are formed by alternately arranging conical surfaces with two tapers, the conical surfaces with the two tapers are respectively called a locking surface (10) and a guide surface (11), wherein the taper values of the locking surfaces (10) are the same and not more than 2, and the taper values of the guide surfaces (11) are the same and not less than 2.

3. The multifunctional suction aid with the function of righting according to claim 2, characterized in that: the outside processing of disk seat (3) lower extreme has the annular groove, is called the jump ring mounting groove, installs stopping jump ring (8) in the jump ring mounting groove, the outside of stopping jump ring (8) with the inboard of casing (1) is processed respectively and is had one-way stopping screw thread (9) of mutually supporting.

4. The multifunctional suction aid with the function of righting according to claim 1, characterized in that: the wear resistance of the wedge block (7) is weaker than that of the split ring (5).

5. The multifunctional suction aid with the function of righting according to claim 1, characterized in that: the split ring (5) is made of beryllium bronze.

6. The multifunctional suction aid with the function of righting according to claim 1, characterized in that: in a natural state, the outer diameter of the split ring (5) is smaller than the inner diameter of the oil pipe.

7. The multifunctional pumping aid with the function of centralizing according to any one of claims 1-6, characterized in that: the side wall of the shell (1) is also provided with another two radial through holes which are called as supporting block (12) mounting holes, and the two supporting block (12) mounting holes and one wedge block (7) mounting hole are positioned on the same section of the shell (1) and are uniformly distributed along the circumference;

the supporting block (12) capable of sliding along the radial direction of the shell (1) is installed in the mounting hole of the supporting block (12), one end of the supporting block (12) abuts against the guide conical surface (4), and the other end of the supporting block (12) abuts against the inner side of the split ring (5).