CN220267677U

CN220267677U - Novel plunger for gas lift

Info

Publication number: CN220267677U
Application number: CN202321816079.6U
Authority: CN
Inventors: 张岁兴
Original assignee: Chengdu Jinshi Yuxing Petroleum Engineering Technology Co ltd
Current assignee: Chengdu Jinshi Yuxing Petroleum Engineering Technology Co ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2023-12-29
Anticipated expiration: 2033-07-12

Abstract

The utility model discloses a novel plunger for gas lift, which relates to the technical field of plunger gas lift and comprises a plunger body, a counterweight structure and a buffer structure, wherein a cavity is formed in the plunger body, the buffer structure comprises an impact head, a buffer spring, a buffer rod, an annular stop block, a hydraulic buffer and a fixed block, the fixed block is fixed in the cavity of the plunger body, the top end of the hydraulic buffer is connected with the fixed block, the bottom end of the hydraulic buffer is abutted to the buffer rod, the bottom end of the buffer rod extends out of the cavity of the plunger body and is in threaded connection with the impact head, the buffer spring is sleeved on the buffer rod, the top end of the buffer spring contacts the bottom of the plunger body, and the bottom end of the buffer spring contacts the impact head. The utility model prolongs the service life of the plunger, reduces the probability of liquid backflow, improves the liquid discharge efficiency of the plunger gas lift, increases the service life and recovery ratio of an oil gas well, avoids devices such as a downhole clamp and the like from being put into an oil pipe in advance, and expands the application range of the plunger.

Description

Novel plunger for gas lift

Technical Field

The utility model relates to the technical field of plunger gas lift, in particular to a novel plunger for gas lift.

Background

Wellbore dropsy is a common problem in the later development stage of oil and gas fields, the gas flow is continuously reduced along with the consumption of energy of a reservoir, the liquid carrying capacity of gas is continuously weakened, and if no effective drainage measures are applied, the deposition of liquid at the bottom of a well can be finally caused, and even the production stopping of the gas well can be caused. The plunger gas lift process utilizes reservoir energy to lift the accumulated liquid from the bottom of the well to the ground, does not need additional energy, and has higher economical efficiency. The plunger gas lift system is used in the natural gas well, can effectively eliminate bottom dropsy, reduce back pressure on a production layer, prevent flooding, and prolong the service life of the natural gas well; the plunger gas lift system is used in a weak self-injection or intermittent oil injection well with high gas-oil ratio, and can effectively utilize the energy of natural gas in crude oil to lift the crude oil in a shaft, so that the recovery ratio of the oil well is improved.

When the traditional gas lift plunger is used, the underground clamping device is put into the oil pipe for matching use. The lowering of the latch is affected by the wire lowering operation and therefore has many application limitations.

The Chinese patent document CN114439434A discloses a plunger with a buffer, wherein the buffer is arranged at the lower end of the plunger, so that a plunger device can be located at the clamping position of an oil pipe in the process of being put down, devices such as a downhole clamp and the like in the oil pipe in advance are avoided, and the application range of the plunger is further widened. The utility model provides plungers with other structures and buffer devices.

Disclosure of Invention

The utility model aims to provide a novel plunger for gas lift, which prolongs the service life of the plunger, reduces the probability of liquid backflow, improves the liquid discharge efficiency of the gas lift of the plunger, and prolongs the service life and recovery ratio of an oil gas well.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the novel plunger for gas lift comprises a plunger body, a counterweight structure and a buffer structure, wherein a cavity is arranged in the plunger body, the counterweight structure and the buffer structure are sequentially arranged in the cavity from top to bottom,

the buffer structure comprises an impact head, a buffer spring, a buffer rod, an annular stop block, a hydraulic buffer and a fixed block, wherein the fixed block is fixed in the cavity of the plunger body, the top end of the hydraulic buffer is connected with the fixed block, the bottom end of the hydraulic buffer is abutted with the buffer rod,

as a preferable technical scheme, the buffer rod bottom stretches out the cavity of plunger body and with collision head threaded connection, buffer spring cover is established on the buffer rod, buffer spring's top contact plunger body bottom, buffer spring bottom contact collision head is last.

As a preferable technical scheme, the bottom of the plunger body is provided with an annular stop block, the top end of the buffer spring contacts the annular stop block, and the bottom end of the buffer rod extends out of the annular stop plate and is in threaded connection with the collision head.

As a preferable technical scheme, the top of the plunger body is connected with a plunger head in a threaded manner.

As a preferred technical scheme, the counter weight structure includes counter weight pole and balancing weight, the counter weight pole is located the plunger body, and its top and the coaxial heart fixed connection of plunger head, bottom and fixed block butt are provided with the screw thread on the counter weight pole, and the balancing weight is annular structure, and the inner ring face is equipped with the internal thread, balancing weight and counter weight pole threaded connection.

As a preferable technical scheme, the outer wall of the plunger body is provided with a plurality of annular rubber scrapers.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the buffer structure is arranged at the lower part of the plunger, so that a clamp does not need to be put into an oil pipe in advance, and the application range of the plunger is expanded. On the basis, a buffer spring and a hydraulic buffer are added at the lower end of the plunger, so that the buffer and shock absorption capacity of the plunger is improved, the service lives of the plunger and the clamping device are prolonged, and the collision head at the lowest end can be independently replaced.

The added counterweight structure can randomly adjust the dead weight of the plunger, and the defect that the plunger cannot reach a wellhead due to the fact that enough pressure cannot be recovered to lift the plunger when the energy at the bottom of an oil-gas well is attenuated is avoided.

The annular rubber scraper added on the plunger can be further sealed, the probability of liquid backflow of the plunger lifting is reduced, meanwhile, the well wall can be continuously cleaned when the plunger moves up and down, and the coagulation of heavy hydrocarbon and wax is avoided.

Drawings

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings:

FIG. 1 is a schematic view of a plunger according to the present utility model;

wherein reference numerals are as follows: plunger body 1, plunger head 2, counter weight pole 3, rubber scraper blade 4, fixed block 5, hydraulic buffer 6, annular dog 7, buffer rod 8, buffer spring 9, collision head 10, balancing weight 11.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples

As shown in figure 1, the novel plunger for gas lift comprises a plunger body, a counterweight structure and a buffer structure.

The plunger body 1 is internally provided with a cavity, and a counterweight structure and a buffer structure are sequentially arranged in the cavity from top to bottom.

The buffer structure comprises an impact head 10, a buffer spring 9, a buffer rod 8, an annular stop block 7, a hydraulic buffer 6 and a fixed block 5, wherein the fixed block 5 is fixed in a cavity of the plunger body 1, the top end of the hydraulic buffer 6 is connected with the fixed block 5, the bottom end of the hydraulic buffer 6 is abutted against the buffer rod 8, the bottom end of the buffer rod 8 extends out of the cavity of the plunger body 1 and is in threaded connection with the impact head 10, and the impact head 10 can be detached and replaced.

The buffer spring 9 is sleeved on the buffer rod 8, the top end of the buffer spring 9 contacts the bottom of the plunger body 1, and the bottom end of the buffer spring 9 contacts the collision head 10.

The plunger body 1 bottom is equipped with annular dog 7, and buffer spring 9's top contacts annular dog 7, and buffer rod 8 bottom stretches out from annular dog 7 back and bump head 10 threaded connection.

Plunger head 2 is connected with the screw thread at the top of plunger body 1, and plunger head 2 rotatable dismantles to take out counter weight pole 3 that plunger head 2 connects together, conveniently increase and decrease balancing weight 11.

The counter weight structure includes counter weight pole 3 and balancing weight 11, and counter weight pole 3 is located plunger body 1, and its top and the coaxial heart fixed connection of plunger head 2, bottom and fixed block 5 butt are provided with the screw thread on the counter weight pole 3, and balancing weight 11 is annular structure, and the inner ring face is equipped with the internal thread, and balancing weight 11 and counter weight pole 3 threaded connection conveniently increase and decrease the quantity of balancing weight 11.

The outer wall of the plunger body 1 is provided with a plurality of annular rubber scrapers 4.

The working principle and the using flow of the embodiment are as follows:

when the plunger is used, the plunger is located in the well, when the plunger falls to the clamping position due to self gravity, the plunger is damped and located through the buffer structure, the collision head 10 can collide first, at this time, the collision head 10 moves upwards relative to the whole plunger, the buffer spring 9 compresses, the buffer rod 8 is driven to move upwards, the buffer rod collides with the hydraulic buffer 6, the hydraulic buffer 6 plays a role, and the two buffer structures achieve the effect of buffering and damping.

When the plunger reciprocates up and down in the pit, the rubber scraper 4 on the plunger continuously cleans the well wall, so that the problem that heavy hydrocarbon and waxy condensate are generated on the well wall can be effectively avoided, and meanwhile, the rubber scraper 4 can also seal the gap between the plunger body 1 and the well wall, and the liquid is prevented from flowing back when the plunger is lifted.

When the energy at the bottom of the oil and gas well changes and the self weight of the plunger needs to be adjusted, the plunger head 10 is rotated to be detached from the plunger body 1, then the counterweight rod 3 fixed with the plunger head 10 is taken out together, the selection of the counterweight 11 is determined, the plunger head 2 is rotated to be fed into the counterweight rod 3, and finally the plunger head 2 is installed back to the plunger body 1. Wherein, the contact surface between the balancing weights 11 is adhered with a rubber layer to prevent damage.

The present utility model can be well implemented according to the above-described embodiments. It should be noted that, based on the above structural design, in order to solve the same technical problems, even some insubstantial improvements made on the present utility model fall within the protection scope of the present utility model.

Claims

1. The utility model provides a novel plunger for gas lift, includes plunger body (1), counter weight structure and buffer structure, its characterized in that, be equipped with the cavity in plunger body (1), be equipped with counter weight structure and buffer structure in proper order from the top down in the cavity, buffer structure includes impact head (10), buffer spring (9), buffer rod (8), annular dog (7), hydraulic buffer (6) and fixed block (5), and fixed block (5) are fixed in plunger body (1) cavity, the top and the fixed block (5) of hydraulic buffer (6) are connected, bottom and buffer rod (8) butt, cavity and with impact head (10) threaded connection of plunger body (1) are stretched out to buffer rod (8) bottom, buffer spring (9) cover is established on buffer rod (8), the top contact plunger body (1) bottom of buffer spring (9) bottom termination touches on impact head (10).

2. The novel plunger for gas lift according to claim 1, wherein the bottom of the plunger body (1) is provided with an annular stop block (7), and the top end of the buffer spring (9) contacts the annular stop block (7); the bottom end of the buffer rod (8) extends out of the annular stop block (7) and is in threaded connection with the collision head (10).

3. The novel plunger for gas lift according to claim 1, wherein the plunger head (2) is connected to the top of the plunger body (1) in a threaded manner.

4. The novel plunger for gas lift according to claim 3, wherein the counterweight structure comprises a counterweight rod (3) and a counterweight block (11), the counterweight rod (3) is located in the plunger body (1), the top end of the counterweight rod is fixedly connected with the plunger head (2) in a coaxial mode, the bottom end of the counterweight rod is abutted to the fixed block (5), threads are arranged on the counterweight rod (3), the counterweight block (11) is of an annular structure, internal threads are arranged on the inner annular surface of the counterweight rod, and the counterweight block (11) is in threaded connection with the counterweight rod (3).

5. The novel plunger for gas lift according to claim 1, wherein the outer wall of the plunger body (1) is provided with a plurality of annular rubber scrapers (4).