Anti-overflow oil well pump

Abstract

The utility model relates to a pump type pumping device specially used for lifting fluid from a deep position, in particular to an anti-overflow oil well pump. The anti-overflow oil well pump comprises a pump cylinder, a plunger installed in the pump cylinder and a blowout prevention valve connected to the lower end of the pump cylinder, the blowout prevention valve comprises a cylindrical valve body, an upper valve seat, a valve ball, a ball support and a lower valve seat, the upper valve seat and the valve ball are installed in the valve body, the ball support and the lower valve seat can be crossed by the valve ball when the lower pressure of the valve ball is larger than a set value, and an impact piece is arranged on the valve ball in the valve body. The impact piece is installed on the valve body through a force limiting locking mechanism, and the upper end of the valve body is provided with a plunger matching end which allows the plunger to abut against the impact piece and drives the impact piece to move downwards so as to drive the valve ball to cross the ball support. According to the utility model, the problem that the valve ball is difficult to fall to the valve ball seat due to uneven stress when the valve ball is knocked down by hydraulic pressure in the prior art is solved, and the operation efficiency of operation is greatly improved.

Description

Technical Field

[0001] The utility model relates to a pump-type pumping device specially used for lifting fluid from a very deep place, in particular to an overflow-proof oil pump. Background Art

[0002] There are two ways to extract oil from the formation. One is to use the energy of the formation itself to lift the crude oil, which is called self-flowing oil production. The other is that due to the lack of energy in the formation itself, it is necessary to artificially use mechanical equipment to supplement the energy of the liquid in the well in order to lift the crude oil to the ground, which is called artificial lift or mechanical oil production. At present, the main mechanical oil production methods in oil fields are gas lift oil production, rod oil production and rodless pump oil production.

[0003] In rod production, the pressure of the produced oil layer is crucial. When the pressure of the oil layer below the oil well is high, the operator may cause overflow in the oil layer well by performing operations such as oil well transfer or perforation pumping. The usual way to prevent overflow is to use circulating well washing and well killing to balance the liquid column pressure and formation pressure. However, well killing or circulating well washing will not only prolong the operation time, but also increase the risk of contaminating the formation. If the anti-blowout capability is added to the ordinary oil pump, the operation time can be shortened while ensuring the safety of well control and reducing the damage to the formation caused by the operation.

[0004] In order to solve the above problems, a Chinese utility model patent with the authorization announcement number CN203939479U and the authorization announcement date of November 12, 2014 discloses a blowout prevention fixed valve for a pump, which includes a fixed valve cover, an upper valve seat, a valve ball, a lower valve seat, a clamping joint, and a cylinder. The fixed valve cover is threadedly connected with the cylinder and the clamping joint in sequence, and an oil and gas channel is opened on the upper end surface of the fixed valve cover, and the upper valve seat is installed in the fixed valve cover; a spring base is provided from top to bottom in the cylinder, and a spring baffle is installed on the spring base, and the valve ball is installed in the cavity between the upper valve seat of the fixed valve cover and the spring baffle on the spring base. The prior art blocks the liquid in the well from entering the oil pipe through the sealing of the upper valve seat and the valve ball, realizes the non-snubbing operation, avoids the loss of liquid in the oil pipe, speeds up the construction progress, and saves the operation cost. When the pump is working normally, the oil pipe is pressed to make the valve ball go down, and the upper spring baffle in the spring base is pressed open to achieve sealing with the lower valve seat.

[0005] When the oil pipe is pumped down, the blowout prevention fixed valve achieves the purpose of preventing overflow through the sealing of the upper valve seat and the valve ball. The valve ball is knocked down by applying pressure to the cylinder, and the upper spring baffle in the spring base is pressed open, so that the valve ball falls on the lower ball seat, and the oil pump can achieve normal production. However, if the valve ball is knocked down by hydraulic pressure, it will be more difficult for the valve ball to fall on the lower ball seat due to uneven force, which affects the operation efficiency. Utility Model Content

[0006] The utility model aims to provide an overflow-proof oil pump to solve the problem that the valve ball in the prior art has difficulty in falling onto the lower ball seat due to uneven force, thus affecting the operation efficiency.

[0007] In order to achieve the above purpose, an anti-overflow oil pump of the utility model adopts the following technical solutions:

[0008] An anti-overflow oil pump comprises a pump barrel, a plunger installed in the pump barrel and a blowout prevention valve connected to the lower end of the pump barrel, the blowout prevention valve comprising a cylindrical valve body, an upper valve seat installed in the valve body, a valve ball, a ball holder which can be passed over by the valve ball when the pressure under the valve ball is greater than a set value, and a lower valve seat, an impact piece is arranged above the valve ball in the valve body, the impact piece is installed on the valve body through a force limiting locking mechanism, and a plunger mating end is provided at the upper end of the valve body for the plunger to press the impact piece and drive the impact piece downward to drive the valve ball to pass over the ball holder.

[0009] Beneficial effects: The utility model is an improved invention. Before resuming production, the prior art needs to introduce hydraulic pressure into the pump body, so as to knock the valve ball off the spring baffle and onto the lower ball seat. However, if the valve ball is knocked off by hydraulic pressure, the difficulty of the valve ball falling onto the lower ball seat will be greatly increased due to uneven force, which affects the operation efficiency of the operation. The utility model, on the other hand, has a plunger mating end for the plunger to press on the top of the blowout preventer valve body. The plunger presses the impact piece through the plunger mating end, drives the impact piece downward and drives the valve ball to pass over the ball support and fall onto the lower valve seat. The plunger pushes the impact piece, and the mechanical transmission force of the impact piece pushes the valve ball, so that the valve ball can fall onto the lower valve seat more easily, greatly improving the operation efficiency.

[0010] Furthermore, the impact member includes an impact sleeve with two ends connected, and the inner hole of the impact sleeve forms an oil and gas channel.

[0011] Furthermore, the impact plate is provided with more than two eccentric through holes.

[0012] Furthermore, the force-limiting locking mechanism includes a retaining spring arranged on the impact sleeve, and a first retaining spring groove cooperating with the retaining spring is provided on the valve body, and the lower groove wall of the first retaining spring groove is a wedge-shaped wall that retracts inward from top to bottom.

[0013] Furthermore, a second retaining spring groove corresponding to the retaining spring is also provided on the valve body. The second retaining spring groove is located below the first retaining spring groove and is used to cooperate with the retaining spring to lock the impact member after the impact member hits the valve ball.

[0014] Furthermore, the upper end of the impact sleeve is threadedly connected with an impact sleeve.

[0015] Furthermore, an oil drain hole is provided on the valve body above the upper valve seat, and the oil drain hole is blocked by an oil drain pin installed therein. The inner end of the oil drain pin extends into the impact sleeve, and the impact sleeve is provided with a long hole for avoiding the oil drain pin. The oil drain pin is provided with an oil drain channel with a closed inner end and an outer end connected to the outside of the valve body.

[0016] Furthermore, a counter sleeve is provided at the upper end of the impact sleeve, and the upper port of the counter sleeve is an inverted cone-shaped port.

[0017] Furthermore, the ball holder includes a cylindrical base and a support arm hinged on the side wall of the base, and a spring is provided between the support arm and the ball seat to drive the support arm to swing upward.

[0018] Furthermore, the spring is a torsion spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of the blowout prevention valve of the overflow prevention oil well pump of the utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of the middle impact member;

[0021] Figure 3 for Figure 2 AA section view of the middle impact part;

[0022] Figure 4 for Figure 3 Schematic diagram of the impact plate structure;

[0023] Figure 5 for Figure 4 A cross-sectional view of the impact plate BB in FIG.

[0024] Figure 6 for Figure 1 The structural diagram of the retaining spring in FIG.

[0025] Figure 7 for Figure 1 A schematic diagram of the structure of the ball holder;

[0026] Figure 8 It is a schematic diagram of the overflow prevention state of the blowout prevention valve of the overflow prevention oil well pump of the utility model;

[0027] Fig. 9 It is a schematic diagram of the normal production state of the blowout preventer valve of the overflow prevention oil pump of the utility model.

[0028] Figure 1-9In: 1. impact piece; 2. valve body; 3. upper valve seat; 4. ball support; 5. clamping nipple; 6. lower valve seat; 7. clamping joint; 8. retaining ring; 9. oil drain pin; 10. valve ball; 11. first retaining ring groove; 12. second retaining ring groove; 13. impact sleeve; 14. impact sleeve; 15. eccentric through hole; 16. impact plate; 17. long hole; 41. base; 42. support arm; 43. torsion spring; 44. pin shaft. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] A specific implementation of an anti-overflow oil pump of the utility model is as follows:

[0031] At present, the most widely used mechanical oil production method at home and abroad is rod oil production, which relies on the reciprocating movement of the plunger in the pump barrel of the oil pump to achieve the pumping and discharge of liquid. In rod oil production, in order to keep the oil layer under appropriate pressure, the oil layer will be operated by oil well rotation or perforation pumping, but these operations may cause the oil well to overflow. The usual way to prevent overflow is to kill the well or circulate the well to balance the liquid column pressure and the formation pressure. However, the use of killing the well or circulating the well will greatly increase the operating time of the staff and increase the risk of contamination to the formation.

[0032] A blowout prevention fixed valve for an oil pump disclosed in the prior art increases the blowout prevention capability of the oil pump pipe and solves the overflow problem. However, when the device resumes production, it relies on hydraulic pressure to knock the valve ball from the spring baffle on the upper part of the spring base to the lower ball seat. The valve ball will have difficulty falling onto the lower ball seat due to uneven force. In view of the above problems, the utility model designs an overflow prevention oil pump. The core concept of the oil pump is to provide an impact piece on the valve ball in the blowout prevention valve body. The impact piece is installed on the valve body through a force limiting locking mechanism. The top of the valve body is also provided with a plunger mating end for the plunger to press against. When the device resumes normal production, the plunger presses the impact piece from the plunger mating end to drive the impact piece downward. The valve ball falls onto the lower valve seat over the ball support by the mechanical transmission force of the impact piece.

[0033] Based on the above invention concept, Figure 1 As shown, an anti-overflow oil pump of the utility model comprises a pump barrel, a plunger and an anti-blowout valve installed at the lower end of the pump barrel and connected to the plunger.

[0034] Specifically, the blowout prevention valve includes a valve body 2, an upper valve seat 3, a valve ball 10, a ball support 4 that can be crossed when the pressure under the valve ball 10 is greater than a set value, and a lower valve seat 6. An impact member 1 is installed inside the valve body 2 through a force-limiting locking mechanism, and a compression nipple 5 is threadedly connected to the bottom end of the valve body 2, and the compression nipple 5 is connected to a compression joint 7 through a thread.

[0035] like Figure 1 As shown, the upper end of the valve body 2 is provided with a plunger fitting end for the plunger to press against.

[0036] Specifically, the valve body 2 is a stepped sleeve with a top radius smaller than a bottom radius. The plunger mating end is opened on the top sleeve of the valve body 2. A three-step hole is provided in the bottom sleeve of the valve body 2. The shape of the three-step hole corresponds one-to-one to the shape of the upper valve seat 3, the ball holder 4 and the top of the clamping short section 5 installed therein.

[0037] like Figure 1-6 As shown, the impact member 1 includes an impact sleeve 13 with two ends connected, and the inner hole of the impact sleeve 13 forms an oil and gas channel.

[0038] Specifically, a long hole 17 is provided on the side of the impact sleeve 13, and an impact plate 16 is provided at the lower end. The impact plate 16 is provided with four eccentric through holes 15. In this embodiment, the eccentric through holes 15 on the impact plate 16 are set to four, but the utility model does not need to be limited to this. One or more eccentric through holes 15 can be provided according to the requirements of the construction environment, and evenly distributed on the impact plate 16 to ensure the balance of the oil circuit. In other embodiments, the eccentric through holes 15 may not be evenly distributed on the impact plate 16, and can be flexibly changed according to the construction environment. The inner hole connected at both ends of the impact sleeve 13 and the gap between the lower end of the impact sleeve 13 and the valve body form an oil and gas channel for oil and gas to pass through. In other embodiments, there may be only an oil and gas channel formed by the inner hole connected at both ends of the impact sleeve 13 or an oil and gas channel formed by the gap between the lower end of the impact sleeve 13 and the valve body. The upper end of the impact sleeve 13 is threadedly connected to the impact sleeve 14. In this embodiment, the upper end of the impact sleeve 14 is an inverted cone that facilitates the entry of the impact rod or oil. In other embodiments, a hemispherical shape or other shapes that facilitate the entry of the impact rod and oil can also be used. The impact sleeve 14 is provided with a retaining spring 8, which is the core component of the force-limiting locking mechanism of the utility model. In other embodiments, the force-limiting locking mechanism can also be a shear pin or other mechanism, which will not be described here.

[0039] like Figure 1 As shown, as a component of the force-limiting locking mechanism in this embodiment, a first retaining spring groove 11 cooperating with the retaining spring 8 is provided on the valve body 2 .

[0040] Specifically, the first retaining spring groove 11 is opened at the uppermost end of the valve body, and the lower groove wall of the first retaining spring groove 11 is a wedge-shaped wall that is inwardly contracted from top to bottom. In this embodiment, the lower groove wall of the first retaining spring groove 11 is an inverted cone, and the inverted cone is selected to facilitate the retaining spring 8 to separate from the first retaining spring groove. In other embodiments, other shapes such as a hemispherical shape that facilitate the retaining spring 8 to separate from the first retaining spring groove 11 can also be selected. The valve body 2 is also provided with a second retaining spring groove 12 corresponding to the retaining spring 8. The second retaining spring groove 12 is located below the first retaining spring groove 11 and is used to cooperate with the retaining spring 8 to lock the impact member 1 after the impact member 1 impacts the valve ball 10.

[0041] like Figure 1 As shown, an oil drain hole is provided on the valve body 2.

[0042] Specifically, the oil drain hole is arranged on the upper valve seat 3 of the valve body 2, and the oil drain hole is blocked by an oil drain pin 9 installed therein, the inner end of the oil drain pin 9 extends to the long hole 17 of the impact sleeve 13 of the impact member 1, and one end of the oil drain pin 9 close to the impact sleeve 13 is closed, and the other end is connected to the oil drain channel outside the valve body 2.

[0043] like Figure 7 As shown, the ball holder 4 includes a cylindrical base 41 and three support arms 42 on the side walls of the base 41 .

[0044] Specifically, three supporting arms 42 in the ball holder 4 are connected to the side wall of the base 41 through a pin 44, and a spring is provided between the supporting arms 42 and the base 41 to enable the supporting arms 42 to swing upward. In this embodiment, a torsion spring 43 is selected as the supporting arm spring, and in other embodiments, a tension spring is also selected, and a hook ring is provided on the tension spring. Through the cooperation of the hook ring and the tension spring, the valve ball 10 can also switch the cooperation relationship between the upper and lower valve seats in the blowout preventer. Similarly, the spring of the utility model can also adopt an elastic mechanism such as a compression spring. In this embodiment, the ball holder 4 is provided with three supporting arms 42, but the utility model does not limit the number of the ball holder 4, and can be flexibly set according to the requirements of the working environment.

[0045] In addition, in other embodiments, a spring base may be provided from top to bottom in the valve body 2 , and a spring stopper may be installed on the spring base to replace the ball holder 4 of this embodiment.

[0046] The working process is described below in combination with the above embodiments.

[0047] Anti-overflow status: Figure 8As shown, the impact member 1 is clamped on the upper end of the valve body 2 through the clamping spring 8 and the first clamping spring groove 11 of the force-limiting locking mechanism, and then the upper valve seat 3, the valve ball 10, the ball holder 4 and the lower valve seat 6 are sequentially installed into the valve body 2, and the clamping nipple 5 is connected to the valve body 2 through an external thread. The support arm 42 of the ball holder 4 can press the valve ball 10 and the upper valve seat 3 with its own torsion spring force. The clamping joint 7 and the clamping nipple 5 work together to fix the lower valve seat 6 to achieve end face sealing.

[0048] During normal production, Fig. 9 As shown, the plunger presses the impact member 1 downward through the plunger matching end at the upper end of the valve body 2, so as to drive the valve ball 10 to pass over the ball holder 4 and enter the inner cavity of the clamping nipple 5, and the valve ball 10 is stopped by the lower valve seat 6 to ensure that the valve ball 10 does not continue to move downward, so as to achieve normal production of the oil well. At the same time, the impact member 1 moves downward to the end of the cavity at the upper end of the valve body 2, and the retaining spring 8 of the impact member 1 cooperates with the second retaining spring groove 12 of the valve body 2 to lock it, so as to achieve the adjustment of the anti-collision distance of the oil pump of the utility model.

[0049] Secondary oil leakage state: When the oil well needs secondary operation, the impact rod is thrown from the pump barrel, and the impact rod enters the channel inside the impact sleeve 13 through the inverted cone opening of the impact sleeve 14 of the impact member 1, directly breaking the oil leakage pin 9 of the valve body 2, so that the remaining oil in the pump barrel can be smoothly discharged into the formation along the oil leakage hole, eliminating the phenomenon of gushing operation.

Claims

1. An overflow-proof oil pump, comprising a pump barrel, a plunger installed in the pump barrel, and a blowout prevention valve connected to the lower end of the pump barrel, characterized in that: The blowout prevention valve includes a cylindrical valve body, an upper valve seat installed in the valve body, a valve ball, a ball holder which can be passed over by the valve ball when the pressure under the valve ball is greater than a set value, and a lower valve seat. An impact piece is arranged above the valve ball in the valve body, and the impact piece is installed on the valve body through a force limiting locking mechanism. A plunger mating end is provided at the upper end of the valve body for the plunger to press the impact piece and drive the impact piece to move downward to drive the valve ball to pass over the ball holder.

2. The anti-overflow oil pump according to claim 1, characterized in that: The impact member comprises an impact sleeve with two ends connected, and the inner hole of the impact sleeve forms an oil and gas channel.

3. The anti-overflow oil pump according to claim 2, characterized in that: An impact plate is arranged at the lower end of the impact sleeve, and more than two eccentric through holes are arranged on the impact plate.

4. The anti-overflow oil pump according to claim 1, 2 or 3, characterized in that: An impact sleeve is provided at the upper end of the impact member, and the force-limiting locking mechanism includes a retaining spring provided on the impact sleeve. A first retaining spring groove cooperating with the retaining spring is provided on the valve body, and the lower groove wall of the first retaining spring groove is a wedge-shaped wall that is retracted inward from top to bottom.

5. The anti-overflow oil pump according to claim 4, characterized in that: A second retaining spring groove corresponding to the retaining spring is also provided on the valve body. The second retaining spring groove is located below the first retaining spring groove and is used to cooperate with the retaining spring to lock the impact member after the impact member impacts the valve ball.

6. The anti-overflow oil pump according to claim 2 or 3, characterized in that: The upper end of the impact sleeve is threadedly connected with an impact sleeve.

7. The anti-overflow oil pump according to claim 2 or 3, characterized in that: An oil drain hole is provided on the valve body above the upper valve seat, and the oil drain hole is blocked by an oil drain pin installed therein. The inner end of the oil drain pin extends into the impact sleeve, and the impact sleeve is provided with a long hole for avoiding the oil drain pin. The oil drain pin is provided with an oil drain channel with a closed inner end and an outer end connected to the outside of the valve body.

8. The anti-overflow oil pump according to claim 7, characterized in that: The upper end of the impact sleeve is provided with an impact sleeve, and the upper port of the impact sleeve is an inverted cone-shaped port.

9. The anti-overflow oil pump according to claim 1, characterized in that: The ball holder comprises a cylindrical base and a support arm hinged on the side wall of the base, and a spring for driving the support arm to swing upward is arranged between the support arm and the ball seat.

10. The anti-overflow oil pump according to claim 9, characterized in that: The spring is a torsion spring.

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