CN210317702U

CN210317702U - Positive-washing paraffin removal anti-blocking oil well pump

Info

Publication number: CN210317702U
Application number: CN201921355993.9U
Authority: CN
Inventors: 王飞; 傅云水; 房志明; 孙建国
Original assignee: Zibo Hongyang Petroleum Equipment Group Co ltd
Current assignee: Zibo Hongyang Petroleum Equipment Group Co ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-04-14
Anticipated expiration: 2029-08-20

Abstract

The utility model belongs to the technical field of the oil-well pump, concretely relates to just wash paraffin removal anti-sticking oil-well pump, including the pump barrel assembly, be equipped with the plunger assembly in the pump barrel assembly, pump barrel assembly below is equipped with fixed valve, is equipped with the valve that moves about in the plunger assembly, and it has the well washing hole to open on the pump barrel assembly, and plunger assembly top is connected with the ware assembly of taking out that helps of one-way circulation, and the well washing hole is greater than the length sum of the ware assembly of taking out and plunger assembly to fixed valve's distance for help to take out ware assembly and plunger assembly can fall to the well washing hole below. The utility model discloses can realize normal oil pumping function, realize the positive washing function moreover, avoid the well-flushing water outflow well head, can not cause the formation of a large amount of subaerial greasy dirt and water, avoid the polluted environment. The equipment such as oil pipes, oil-well pumps and the like do not need to be lifted out of the well, so that the oil well cleaning time is greatly saved, the operation cost is reduced, and the stability of the whole system is ensured. The whole set of device has the functions of oil extraction and well-flushing paraffin removal, and the well-flushing paraffin removal operation is environment-friendly.

Description

Positive-washing paraffin removal anti-blocking oil well pump

Technical Field

The utility model relates to a just wash paraffin removal anti-sticking oil-well pump belongs to oil-well pump technical field.

Background

Because the crude oil contains a large amount of sand, water, wax and other substances, after the oil is extracted for a period of time, the problems of sand blocking of a sieve tube, wax deposition and scaling of an oil pipe, sand blocking of an oil pump and the like can be caused, and the oil pumping efficiency of the oil pump is seriously influenced, so that the well is required to be regularly washed. The well-flushing method generally comprises a forward circulation and a reverse circulation or a forward flushing and a reverse flushing. The well-flushing fluid enters from the oil pipe and returns to the ground from the sleeve outside the oil pipe for normal flushing, and vice versa for backwashing. The oil well pump used in oil field is mostly tubular plunger pump, its interior has two check valves, crude oil can only be taken out from the shaft bottom, can not flow backwards. This structure limits on-site well-flushing operations, mostly only with backwashing. Because the used well-flushing steam can flow into the oil pipe through the screen to be cleaned after passing through a long distance between the oil pipe and the outer sleeve of the oil pipe, the method has the disadvantages of serious heat dissipation, large pressure drop, loss caused by the fact that the steam can permeate into crude oil, and unsatisfactory cleaning effect.

In order to improve the well washing effect, the pumping unit has to be stopped, the pumping rod, the oil pipe and the oil pump are lifted out from the bottom of the well, transported to a designated cleaning station for cleaning, then transported back to a well site, and operated and lowered into the well. Consume a large amount of manpower and material resources, influence oil recovery output, and ground cleaning still can cause the pollution moreover.

There are several forward wash protocols that currently exist:

the lower end of a plunger pump is connected with a straight cylinder at one end, a set of automatic valve opening mechanism is arranged in the straight cylinder, when a pump body works normally, a plunger and a movable valve work normally, when a well is washed, the plunger moves downwards, the movable valve is opened, and a fixed valve is pushed open through designed parts, so that a normal washing channel is opened. The structure is complex, the condition that the valve can not be opened easily occurs underground, and therefore the popularization is less.

And the forward and reverse well-flushing oil-well pump is provided with a well-flushing hole on a pump cylinder, but the well-flushing operation can be carried out only by lifting the sucker rod string out of the pump cylinder during forward and reverse well flushing, so that the operation cost is increased.

SUMMERY OF THE UTILITY MODEL

According to the not enough among the above prior art, the utility model discloses the technical problem who solves is: the positive-washing wax-removal anti-blocking oil well pump can realize normal oil pumping operation and also can positive-wash oil wells for wax removal and scale removal on the premise of not lifting out a sucker rod string, thereby reducing manpower and material resources consumed by well washing, lowering the cost and simultaneously reducing the pollution to the ground environment.

Just wash paraffin removal anti-sticking oil-well pump, including the pump barrel assembly, be equipped with the plunger assembly in the pump barrel assembly, pump barrel assembly below is equipped with fixed valve, is equipped with the valve that moves about in the plunger assembly, it has the well washing hole to open on the pump barrel assembly, plunger assembly top is connected with the ware assembly of helping taking out of one-way circulation, can prevent to move about the valve and block up. The distance from the well washing hole to the fixed valve is larger than the sum of the lengths of the pumping aid assembly and the plunger assembly, so that the pumping aid assembly and the plunger assembly can fall below the well washing hole, the pumping aid assembly is in one-way circulation, and the cleaning solution mixed with impurities cannot enter below the pumping aid, so that the well can be positively washed without lifting the sucker rod string. The pumping aid assembly and the plunger assembly can realize two functions of pumping and washing, and can realize pollution-free operation on a wellhead.

The upper part of the pumping-aid assembly is connected with a centralizer assembly which is arranged in the oil production string.

And a sieve tube assembly is connected below the fixed valve.

The upper limit position and the lower limit position of the plunger stroke are adjusted and set according to the actual stroke length of the pumping well during normal oil production, and the oil production working principle is the same as that of a conventional oil well pump. During the upward stroke, the plunger assembly moves upwards, a traveling valve on the plunger assembly is closed under the action of oil pressure in the oil extraction production string, the volume of a pump cavity is increased, the pressure is reduced, and underground oil passes through a sieve tube assembly at the lower part under the action of sinking pressure, opens a fixed valve and enters the pump cavity; meanwhile, the oil on the upper part of the plunger assembly is lifted by the height of one stroke; during the lower stroke, the volume of the pump cavity is reduced, the pressure is increased, the fixed valve is closed, the floating valve on the plunger assembly is opened, and the oil in the pump cavity is forced to pass through the plunger assembly and the pumping aid assembly to reach the oil production pipe column to complete a working cycle.

Although the pump barrel is provided with the well-washing hole, the extreme position of the plunger assembly can ensure that the well-washing hole of the oil-well pump is always sealed by the sealing surface of the plunger assembly no matter in the upstroke or the downstroke, thereby ensuring the normal oil extraction production of the oil-well pump.

During well washing operation, the plunger assembly is lowered to the fixed valve, the pumping aid assembly is arranged at the lower end of the well washing hole, well washing liquid is injected into an oil production pipe column through an oil pipe of an oil production well mouth, impurities such as dirt, wax and the like attached to the inner wall of the oil pipe are cleaned, then the well washing liquid enters an annular space between the pump barrel and the casing pipe through the well washing hole in the pump barrel, and then the well washing liquid is reflected out of the well mouth and enters a recovery device on the ground.

The pump truck is connected with an oil pipe, the oil pipe is communicated with the oil production tubular column, and the displacement of the pump truck is gradually increased from small to large during well flushing operation. Because the upper end of the plunger assembly is provided with the pumping aid assembly for well-flushing paraffin removal anti-blocking, the flowing direction of liquid in the pumping aid assembly is one-way from bottom to top, but the liquid on the pumping aid assembly is more and more tightly pumped downwards, so that cleaning liquid cannot enter the lower side of the pumping aid assembly, impurities in well-flushing can be effectively blocked from entering the floating valve, the floating valve can be prevented from being blocked in well-flushing, and normal work of the well-flushing is ensured. After the well washing operation is finished, the plunger assembly is lifted up to the original position, and the cleaning operation can be realized.

Compared with the prior art, the utility model beneficial effect who has is:

the positive-washing paraffin removal anti-blocking oil well pump has a simple structure, can realize a normal oil pumping function, realizes a positive-washing function, greatly improves the cleaning effect, improves the crude oil yield and saves energy; the well washing is positive washing and is circulated in the well, so that the well washing water is prevented from flowing out of the well mouth, a large amount of oil stain and water on the ground can not be formed, and the environment pollution is avoided. The equipment such as oil pipes, oil-well pumps and the like do not need to be lifted out of the well, so that the oil well cleaning time is greatly saved, the operation cost is reduced, and the stability of the whole system is ensured. The whole set of device has the functions of oil extraction and well-flushing paraffin removal, and the well-flushing paraffin removal operation is environment-friendly.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. an oil recovery production string; 2. a centralizer assembly; 3. a pump barrel assembly; 4. washing the well hole; 5. a pumping aid assembly; 6. a swimming valve; 7. a plunger assembly; 8. fixing a valve; 9. a screen assembly.

Detailed Description

The invention will be further described with reference to the following examples:

as shown in figure 1, the positive-cleaning paraffin removal anti-sticking oil well pump comprises a pump barrel assembly 3, wherein a plunger assembly 7 is arranged in the pump barrel assembly 3, a fixed valve 8 is arranged below the pump barrel assembly 3, and a sieve tube assembly 9 is connected below the fixed valve 8. A traveling valve 6 is arranged in the plunger assembly 7, a well washing hole 4 is formed in the pump barrel assembly 3, a one-way flow pumping aid assembly 5 is connected above the plunger assembly 7, and the distance from the well washing hole 4 to the fixed valve 8 is larger than the sum of the lengths of the pumping aid assembly 5 and the plunger assembly 7, so that the pumping aid assembly 5 and the plunger assembly 7 can fall below the well washing hole 4. The upper part of the pumping aid assembly 5 is also connected with a centralizer assembly 2, and the centralizer assembly 2 is arranged in the oil production tubular column 1.

The utility model discloses a working process or theory of operation:

the oil extraction working process:

the working principle of oil extraction is the same as that of the conventional oil well pump. During the upward stroke, the plunger assembly 7 moves upwards, the floating valve 6 on the plunger assembly 7 is closed under the action of oil pressure in the oil extraction production pipe column 1, the volume of the pump cavity is increased, the pressure is reduced, and under the action of sinking pressure, downhole oil passes through the sieve tube assembly 9 at the lower part, and opens the fixed valve 8 to enter the pump cavity; meanwhile, the oil on the upper part of the plunger assembly 7 is lifted to the height of one stroke; during the lower stroke, the volume of the pump cavity is reduced, the pressure is increased, the fixed valve 8 is closed, the floating valve 6 on the plunger assembly 7 is opened, and the oil in the pump cavity is forced to pass through the plunger assembly 7 and the pumping aid assembly 5 to reach the oil production pipe column 1, so that a working cycle is completed.

Although the pump barrel is provided with the well-washing hole 4, the extreme position of the plunger assembly 7 can ensure that the well-washing hole 4 of the oil-well pump is always sealed by the sealing surface of the plunger assembly 7 no matter in the upstroke or the downstroke, thereby ensuring the normal oil extraction production of the oil-well pump.

And (3) well washing operation process:

during well washing operation, the plunger assembly 7 is lowered to the fixed valve 8, the pumping aid assembly 5 is arranged at the lower end of the well washing hole 4, well washing liquid is injected into the oil extraction production pipe column 1 through an oil pipe of an oil extraction well mouth, impurities such as dirt, wax and the like attached to the inner wall of the oil pipe are cleaned, then the well washing liquid enters an annular space between the pump barrel and the casing through the well washing hole 4 on the pump barrel, and then the well washing liquid is reversely discharged from the well mouth and enters the recovery device on the ground. The pump truck is connected with an oil pipe, the oil pipe is communicated with the oil production tubular column 1, and the displacement of the pump truck is gradually increased from small to large during well flushing operation. Because the upper end of the plunger assembly 7 is provided with the well-washing paraffin-removal anti-blocking pumping-aid assembly 5, the flowing direction of liquid in the pumping-aid assembly 5 is one-way from bottom to top, but the liquid on the pumping-aid assembly is more tightly beaten downwards, so that cleaning liquid cannot enter the lower side of the pumping-aid assembly 5, impurities in well washing can be effectively blocked from entering the floating valve 6, the floating valve 6 can be prevented from being blocked in well washing, and normal work of the well washing can be guaranteed. After the well washing operation is finished, the plunger assembly 7 is lifted up to the original position, so that the well washing operation can be realized under the condition that equipment is not lifted out, and the cleaning operation can be realized.

The technical research institute of 3 months Jilin oil field waste oil recovery plant in 2017 uses a normal-washing wax-cleaning anti-blocking oil well pump in 3-010.4 and 1-5 of Dongdong respectively, and the test data are as follows:

through comparison of test results, the pump can be concluded to achieve the purposes of saving the liquid consumption for well washing, prolonging the paraffin removal period of an oil well and avoiding the pollution of external liquid in a shaft to an oil layer.

Claims

1. The utility model provides a just wash paraffin removal anti-sticking oil-well pump, includes pump cylinder assembly (3), is equipped with plunger assembly (7) in pump cylinder assembly (3), and pump cylinder assembly (3) below is equipped with fixed valve (8), is equipped with valve (6) that move about in plunger assembly (7), its characterized in that: a well washing hole (4) is formed in the pump barrel assembly (3), a one-way circulation pumping aid assembly (5) is connected above the plunger assembly (7), and the distance from the well washing hole (4) to the fixed valve (8) is greater than the sum of the lengths of the pumping aid assembly (5) and the plunger assembly (7).

2. The positive-washing wax-removal anti-blocking oil-well pump according to claim 1, characterized in that: a centralizer assembly (2) is arranged above the pumping aid assembly (5), and the centralizer assembly (2) is arranged in the oil production string (1).