阅读说明：本技术 防泥砂杆式抽油泵 (Sand prevention rod type oil well pump ) 是由 张雪晶 刘敬钦 王传荣 于 2020-07-03 设计创作，主要内容包括：本发明提供一种防泥砂杆式抽油泵,包括泵筒、抽油杆、柱塞、连接管和进油固定管,抽油杆的底部固定连接柱塞,柱塞内安装有出油凡尔阀座,出油凡尔阀座上设有出油凡尔球,柱塞的顶部设有出油孔,柱塞可跟随抽油杆在泵筒内上下移动；连接管由一接箍固定连接于泵筒的下方,连接管内固定安装进油固定管,且进油固定管与连接管之间设有环形的泄砂空间,泄砂空间向下延伸至进油固定管的下侧；进油固定管的上侧安装有进油凡尔阀座,进油凡尔阀座上设有进油凡尔球,进油固定管上于进油凡尔阀座的上方设有进油孔。本发明解决了柱塞与泵筒之间的泥砂刮伤柱塞以及柱塞需要的拉拔力大,导致抽油泵的使用寿命短、工作能耗高的问题。(The invention provides a sand-proof rod type oil well pump, which comprises a pump cylinder, a sucker rod, a plunger, a connecting pipe and an oil inlet fixing pipe, wherein the bottom of the sucker rod is fixedly connected with the plunger; the connecting pipe is fixedly connected below the pump barrel through a coupling, an oil inlet fixing pipe is fixedly installed in the connecting pipe, an annular sand discharging space is arranged between the oil inlet fixing pipe and the connecting pipe, and the sand discharging space extends downwards to the lower side of the oil inlet fixing pipe; an oil inlet valve seat is installed on the upper side of the oil inlet fixing pipe, an oil inlet valve ball is arranged on the oil inlet valve seat, and an oil inlet hole is formed in the oil inlet fixing pipe and above the oil inlet valve seat. The invention solves the problems that the plunger is scratched by mud and sand between the plunger and the pump barrel, and the plunger needs large drawing force, so that the oil well pump has short service life and high working energy consumption.)

1. The mud and sand prevention rod type oil well pump is characterized by comprising a pump cylinder, a pumping rod, a plunger, a connecting pipe and an oil inlet fixing pipe, wherein the pumping rod and the plunger are both positioned in the pump cylinder and are coaxially arranged with the pump cylinder; the connecting pipe is fixedly connected below the pump barrel through a coupling, the oil inlet fixing pipe is fixedly installed in the connecting pipe, an annular sand discharging space is arranged between the oil inlet fixing pipe and the connecting pipe, and the sand discharging space extends downwards to the lower side of the oil inlet fixing pipe; the oil inlet valve seat is mounted on the upper side of the oil inlet fixing pipe, an oil inlet valve ball is arranged on the oil inlet valve seat, and at least one oil inlet hole is formed in the oil inlet fixing pipe and above the oil inlet valve seat.

2. The mud and sand prevention rod type oil well pump according to claim 1, wherein the oil inlet hole is located on the side wall of the oil inlet fixing pipe, and the sand discharging space and the pump cylinder are arranged in a staggered mode in the longitudinal direction.

3. The mud-proof rod type oil well pump according to claim 2, wherein the inner wall of the connecting pipe is provided with at least one annular sand-blocking ring, and a sand-feeding passage is reserved between the sand-blocking ring and the oil-feeding fixing pipe; or the outer wall of the oil inlet fixing pipe is provided with at least one annular sand-blocking ring, and a sand inlet channel is reserved between the sand-blocking ring and the connecting pipe.

4. The mud-proof rod type oil well pump according to claim 3, wherein the sand inlet channel comprises a sand guide part and a sand inlet part which are sequentially arranged from top to bottom, and the cross section of the sand guide part is in a tapered inverted circular truncated cone shape.

5. The mud-proof rod type oil well pump as defined in claim 4, wherein the width of the sand inlet passage between adjacent sand-blocking rings is reduced from top to bottom.

6. The mud and sand prevention rod type oil well pump according to any one of claims 1 to 2, wherein the sucker rod comprises an upper rod body, an upper connecting plate, a lower rod body, a lower connecting plate, an elastic connecting piece and balls, wherein oil outlet channels are arranged in the upper connecting plate and the lower connecting plate, the upper rod body is fixed in the center of the upper connecting plate, the lower rod body is fixed in the center of the lower connecting plate and is fixedly connected with the plunger, the balls are arranged between the upper rod body and the lower rod body, the elastic connecting piece is arranged between the upper connecting plate and the lower connecting plate, the elastic connecting piece can drive the lower rod body and the upper rod body to move up and down together, and relative swing in the radial direction can occur between the upper rod body and the lower rod body.

7. The mud and sand prevention rod type oil well pump according to claim 6, wherein the bottom surface of the upper rod body and the top surface of the lower rod body are provided with arc-shaped clamping grooves, and the upper side and the lower side of the ball are respectively embedded into the corresponding clamping grooves.

8. The mud and sand prevention rod pump as defined in claim 6, wherein said elastic connector is an elastic rubber.

9. The mud and sand prevention rod type oil well pump as defined in claim 6, wherein at least one annular sand scraping groove is formed on an outer side wall of the plunger.

Technical Field

The invention belongs to the technical field of oil extraction equipment, and particularly relates to a silt-preventing rod type oil well pump.

Background

The oil well pump is a device for pumping crude oil in a well to the ground, and generally comprises a sucker rod, a pump barrel, a plunger, an oil inlet ball valve and an oil outlet ball valve, wherein the sucker rod is fixedly connected with the plunger, the plunger is positioned in the pump barrel, the inside of the plunger is of a cavity structure, the oil inlet ball valve and an oil outlet hole in the plunger are generally arranged in a straight-up and straight-down manner, and the oil inlet ball valve and the oil outlet ball valve are alternately closed and opened through the up-and-down reciprocating movement of the plunger to complete the pumping action of the. Because the underground oil generally contains a large amount of silt, the silt and the oil are sucked upwards in the plunger pumping process, so that the silt enters a gap between the plunger and the pump barrel, the silt is stuck to a copper wall of the plunger and scratched, the drawing force applied to the plunger is increased, the plunger is blocked in movement, the energy consumption is increased, and the service life of the oil well pump is shortened.

Disclosure of Invention

The invention aims to provide a silt-preventing rod type oil well pump, which aims to solve the problems that silt between a plunger and a pump cylinder scratches the plunger and the plunger needs large drawing force, so that the oil well pump has short service life and high working energy consumption.

The invention provides the following technical scheme:

a sand-proof rod type oil well pump comprises a pump cylinder, a sucker rod, a plunger, a connecting pipe and an oil inlet fixing pipe, wherein the sucker rod and the plunger are both positioned in the pump cylinder and are coaxially arranged with the pump cylinder; the connecting pipe is fixedly connected below the pump barrel through a coupling, the oil inlet fixing pipe is fixedly installed in the connecting pipe, an annular sand discharging space is arranged between the oil inlet fixing pipe and the connecting pipe, and the sand discharging space extends downwards to the lower side of the oil inlet fixing pipe; the oil inlet valve seat is mounted on the upper side of the oil inlet fixing pipe, an oil inlet valve ball is arranged on the oil inlet valve seat, and at least one oil inlet hole is formed in the oil inlet fixing pipe and above the oil inlet valve seat.

Preferably, the oil inlet hole is located on the side wall of the oil inlet fixing pipe, and the sand discharge space and the pump cylinder are arranged in a staggered mode in the longitudinal direction.

Furthermore, at least one annular sand-blocking ring is arranged on the inner wall of the connecting pipe, and a sand inlet channel is reserved between the sand-blocking ring and the oil inlet fixing pipe; or the outer wall of the oil inlet fixing pipe is provided with at least one annular sand-blocking ring, and a sand inlet channel is reserved between the sand-blocking ring and the connecting pipe.

Preferably, advance the sand passageway including set gradually sand portion and advance sand portion from top to bottom, the cross section of sand portion of leading is the radius bench type of convergent.

Preferably, the width of the sand inlet channel between the adjacent sand-blocking rings is reduced from top to bottom in sequence.

Further, the sucker rod includes the body of rod, upper junction plate, the body of rod down, lower connecting plate, elastic connecting piece and ball, the upper junction plate with all be equipped with out the oil passageway in the lower connecting plate, the upper junction plate is fixed in the central authorities of upper junction plate, the body of rod is fixed in down the central authorities of connecting plate just down body of rod fixed connection the plunger, the upper junction plate with install down between the body of rod the ball, the upper junction plate with the shoulder outer fringe installation of lower connecting plate elastic connecting piece, elastic connecting piece can drive down the body of rod with the upper junction plate reciprocates together, the upper junction plate with can take place radial upward relative swing down between the body of rod.

Preferably, the bottom surface of the upper rod body and the top surface of the lower rod body are provided with arc-shaped clamping grooves, and the upper side and the lower side of the ball are respectively embedded into the corresponding clamping grooves.

Preferably, the elastic connecting piece is elastic rubber.

Furthermore, the outer side wall of the plunger is provided with at least one annular sand scraping groove.

The invention has the beneficial effects that:

according to the oil pumping device, the oil inlet valve seat is arranged on the oil inlet fixing pipe, the annular sand discharging space is arranged between the oil inlet fixing pipe and the connecting pipe, silt is settled in the sand discharging space, the sand discharging space extends downwards to the lower side of the oil inlet fixing pipe, and the oil inlet valve seat and the oil inlet hole are both positioned on the upper side of the oil inlet fixing pipe, so that the sand capacity of the sand discharging space is increased by utilizing the longitudinal distance between the oil inlet hole and the sand discharging space, the amount of sand pumped into the pump barrel is reduced, the phenomenon that the piston movement is blocked or the outer wall of the plunger is scratched due to the blockage of the sand between the plunger and the pump barrel is improved, the pulling force required by the up-and-down movement of the plunger is reduced, and the working energy consumption of the oil pumping.

The oil inlet hole is positioned on the side wall of the oil inlet fixing pipe, the sand discharging space and the pump barrel are arranged in a staggered mode in the longitudinal direction, the oil inlet hole and the sand discharging space do not face the plunger, and therefore the phenomenon that the plunger extracts mud and sand in the sand discharging space for the second time to cause clamping stagnation of relative movement between the plunger and the pump barrel can be avoided.

The sucker rod is of a split structure, the ball and the elastic connecting piece are arranged between the upper rod body and the lower rod body, so that the upper rod body and the lower rod body can slightly move in the radial direction, after long-term use, when eccentric wear occurs due to a small amount of sand retained between the plunger and the pump barrel, the lower rod body can automatically and slightly adjust the axis of the plunger, the phenomenon of scratching caused by rigid friction of the sand between the plunger and the pump barrel is prevented, and the service life of the plunger and the pump barrel is prolonged. The outer side wall of the plunger is provided with an annular sand scraping groove, and in the process that the plunger moves up and down, mud and sand in the gap between the plunger and the pump barrel can be scraped into the sand scraping groove for temporary storage, so that the plunger or the pump barrel is further protected from being abraded by the mud and sand.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

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

FIG. 2 is a schematic top view of the upper connecting plate and the upper rod body according to the present invention;

labeled as: 1. a pump barrel; 2. a sucker rod; 3. a plunger; 4. a connecting pipe; 5. an oil inlet fixed pipe; 6. an oil outlet valve seat; 7. an oil outlet valve ball; 8. an oil outlet hole; 9. a coupling; 10. a sand discharge space; 11. an oil inlet valve seat; 12. feeding a valve ball; 13. an oil inlet hole; 14. a sand-blocking ring; 15. a sand inlet channel; 16. a sand guide part; 17. a sand inlet part; 18. a rod body is arranged; 19. an upper connecting plate; 20. a lower rod body; 21. a lower connecting plate; 22. an elastic connecting member; 23. a ball bearing; 24. a lower cavity; 25. an upper cavity; 26. a sand scraping groove; 27. an oil outlet channel.

Detailed Description

As shown in fig. 1, a sand and mud prevention rod formula oil-well pump, including pump barrel 1, sucker rod 2, plunger 3, connecting pipe 4 and the fixed pipe 5 of oil feed, sucker rod 2 and plunger 3 all are located pump barrel 1 and with the coaxial setting of pump barrel 1, the inside plunger 3 that is equipped with the cavity of bottom fixed connection of sucker rod 2, install out oil valve seat 6 in the plunger 3, be equipped with out oil valve ball 7 on the out oil valve seat 6, the top of plunger 3 is equipped with a plurality of oil outlet 8, plunger 3 can follow sucker rod 2 and reciprocate in pump barrel 1.

Connecting pipe 4 is by a coupling 9 fixed connection in the below of pump barrel 1, and the fixed pipe of fixed installation oil feed 5 in the connecting pipe 4, and is equipped with annular sand discharge space 10 between the fixed pipe of oil feed 5 and the connecting pipe 4, and sand discharge space 10 downwardly extending to the downside of the fixed pipe of oil feed 5, and sand discharge space 10 and pump barrel 1 stagger the setting on vertical. An oil inlet valve seat 11 is mounted on the upper side of the oil inlet fixing pipe 5, an oil inlet valve ball 12 is arranged on the oil inlet valve seat 11, at least one oil inlet hole 13 is formed in the oil inlet fixing pipe 5 above the oil inlet valve seat 11, and the oil inlet hole 13 is located in the side wall of the oil inlet fixing pipe 5. When the pumping rod 2 is pulled upwards, the oil inlet valve ball 12 floats upwards, the oil inlet valve seat 11 is opened, the crude oil is pumped into the lower cavity 24 of the pump barrel 1 after passing through the oil inlet hole 13, and most of the silt sinks into the sand discharging space 10 under the action of gravity. The oil inlet hole 13 is not right opposite to the lower cavity of the pump barrel, so that the mud and sand in the crude oil can be settled into the sand discharge space 10, and the sand discharge space 10 and the pump barrel 1 are arranged in a staggered mode in the longitudinal direction, so that the mud and sand in the sand discharge space 10 can be prevented from being pumped away again in the secondary pumping process.

At least one annular sand-blocking ring 14 is arranged on the inner wall of the connecting pipe 4 at intervals, and a sand inlet channel 15 is reserved between the sand-blocking ring 14 and the oil inlet fixing pipe 5. At least one annular sand-blocking ring can be arranged on the outer wall of the oil inlet fixing pipe 5, and a sand inlet channel is reserved between the sand-blocking ring and the connecting pipe. The sand-blocking ring 14 further increases the upward resistance of the sand in the sand-discharging space 10, and prevents the sand from being pumped out of the sand-discharging space 10 for a second time.

Specifically, the sand inlet channel 15 may include a sand guide portion 16 and a sand inlet portion 17 sequentially arranged from top to bottom, the cross section of the sand guide portion 16 is a tapered inverted circular truncated cone, and the sand and the mud may smoothly slide down along the sand guide portion 16. The width of the sand inlet channel between the adjacent sand-blocking rings 14 is reduced from top to bottom in sequence, and the swabbing resistance of the silt at the bottom of the sand discharge space is increased.

In order to prevent a small amount of silt entering the pump barrel from blocking the plunger 3 and the pump barrel 1 in the oil pumping process, the sucker rod 2 of the oil well pump comprises an upper rod body 18, an upper connecting plate 19, a lower rod body 20, a lower connecting plate 21, an elastic connecting piece 22 and a ball 23, as shown in fig. 1 and 2, oil outlet channels 27 are arranged in the upper connecting plate 19 and the lower connecting plate 21, and large gaps are reserved among the upper connecting plate 19, the lower connecting plate 21 and the pump barrel 1, so that silt blocking is prevented and the plunger is convenient to adjust automatically. The upper rod body 18 is welded at the center of the upper connecting plate 19, the lower rod body 20 is welded at the center of the lower connecting plate 21, the plunger 3 is welded at the bottom of the lower rod body 20, a ball 23 is arranged between the upper rod body 18 and the lower rod body 20, the bottom surface of the upper rod body 18 and the top surface of the lower rod body 20 are both provided with arc-shaped clamping grooves, and the upper side and the lower side of the ball 23 are respectively embedded into the corresponding clamping grooves. An elastic connecting piece 22 is arranged between the upper connecting plate 19 and the lower connecting plate 21, the elastic connecting piece is made of elastic rubber, the elastic connecting piece 22 can drive the lower rod body 20 and the upper rod body 18 to move up and down together, and the upper rod body 18 and the lower rod body 20 can swing in the radial direction relatively. When mud and sand appear between the plunger 3 and the pump barrel 1 at the position a, the plunger 3 can automatically slightly shift to the position b opposite to the position a while moving up and down under the action of the ball 23 and the elastic connecting piece 22 until the plunger 3 restores to the initial position after the mud and sand slide from the gap between the plunger 3 and the pump barrel 1, thereby preventing the mud and sand from scratching the plunger 3 and the pump barrel 1.

In order to further protect the plunger 3 and the pump barrel 1, at least one annular sand scraping groove 26 is formed in the outer side wall of the plunger 3, and mud and sand in a gap between the plunger 3 and the pump barrel 1 can be scraped into the sand scraping groove 26 for temporary storage in the process that the plunger 3 moves up and down, so that the plunger or the pump barrel is prevented from being scratched by the mud and sand. The plunger can be detached from the pump cylinder regularly to clean the silt in the sand scraping groove.

The working process of the oil well pump is as follows:

when the pumping rod 2 moves upwards, the plunger 3 is driven to move upwards, the oil outlet valve seat 6 is closed, the oil inlet valve seat 11 is opened, after the sand-containing crude oil passes through the oil inlet hole 13 of the oil inlet fixing pipe 5, most of silt with larger mass sequentially passes through the sand inlet channels 15 and then settles to the bottom of the sand discharge space 10, and the crude oil is pumped into the lower cavity 24 of the pump barrel until the lower cavity 24 is full.

When the sucker rod 2 moves downwards, the plunger 3 is driven to move downwards, the oil outlet valve seat 6 is opened, the oil inlet valve seat 11 is closed, and crude oil in the lower cavity 24 of the pump cylinder enters the upper cavity 25 of the pump cylinder after passing through the oil outlet 8 of the plunger and is pumped into the oil pipe. When a small amount of sand enters the gap between the plunger 3 and the pump barrel 1, the position of the plunger 3 is slightly adjusted automatically by the lower rod body 20, so that the plunger 3 is prevented from being worn by the sand, and the sand is brought into the annular sand scraping groove 26 under the inertia effect of the up-and-down movement of the plunger 3.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.