CN115247641A - A flexible sucker rod hydraulic pumping aid device and method and downhole pulling aid cylinder - Google Patents

Abstract

The invention discloses a flexible sucker rod hydraulic pumping-aid device and method and an underground pulling-aid cylinder, wherein the flexible sucker rod hydraulic pumping-aid device comprises a flexible sucker rod, a rigid sucker rod and an oil well pump, and the lower end of the rigid sucker rod is connected with a plunger of the oil well pump; the underground hydraulic control system also comprises an underground pull-assisting cylinder and a ground hydraulic control device; the upper end of the underground pull-assisting cylinder is connected with the lower end of the flexible sucker rod, and the lower end of the underground pull-assisting cylinder is connected with the upper end of the rigid sucker rod; and the ground hydraulic control device is communicated with a hydraulic hole of the underground pulling-assisting cylinder through a hydraulic pipe. The invention has simple process, high reliability and easy modification and installation; the power-assisted sucker rod moves downwards, so that the instability of a pressure rod and the abrasion of a pipe rod are avoided; the hydraulic fluid stroke is in closed circulation, so that the hydraulic fluid stroke is green and energy-saving.

Description

A flexible sucker rod hydraulic pumping aid device and method and downhole pulling aid cylinder

technical field

The invention relates to the field of petroleum exploitation technology, in particular to a flexible sucker rod hydraulic pumping aid device and method and a downhole pulling aid cylinder.

Background technique

In mechanical production wells, the liquid column load on the pumping unit and the sucker rod is large. On the one hand, the pumping unit consumes a lot of energy, consumes a lot of electricity, has low mechanical efficiency, and has poor economic benefits; on the other hand, the working stress of the sucker rod It is easy to be broken by the accused, and the force state of the sucker rod is compressive stress when it goes down, and it is tensile stress when it goes up. Short life, short oil well production cycle, and poor oilfield development benefits. At present, with the application of carbon fiber sucker rod, the problem of insufficient working stress of the sucker rod has been solved to a certain extent, but the inconsistency between the downstroke of the pumping unit and the downstroke of the oil well pump leads to the instability of the carbon fiber sucker rod pressure rod. The main reason is that Carbon fiber and other flexible sucker rods have the characteristics of light weight and high flexibility. Some researchers have designed a weighted rod at the end of the sucker rod, but this also increases the load of the sucker rod, resulting in an increase in the power consumption of the pumping unit, which cannot be effectively implemented. The purpose of deep pumping with flexible rods for conventional pumping units.

Publication (announcement) No.: CN101550808B, publication (announcement) date: 2011-06-08 relates to a soft-clamp self-lysis process for a flexible sucker rod string. It mainly solves the problem that the flexible sucker rod of the double-range flexible pumping unit itself cannot realize the release of the card. When the plunger of the downhole pump slows down due to the soft jam, the pumping unit works normally during the upstroke, and the shocker sleeve and the secondary weighting rod continue to run downwards during the downstroke, while the shocker mandrel and the primary If the weighting rod and the plunger do not move, the upper sleeve and the secondary weighting rod will have a hammering effect on the mandrel and the primary weighting rod. At the same time, the weight of the secondary weighting rod will participate in it to produce a boosting effect, and this force will overcome the column. The friction between the plug and the pump barrel releases it from the jam. The invention has the characteristics of quick card release and reliable action.

Publication (Announcement) No.: CN201288517Y, Publication (Announcement) Date: 2009-08-12 It relates to a sucker rod pumping centralizer, including a central rod, two ends of the central rod are provided with joints, and a first centralizer is provided on the central rod body and a second righting body, the first righting body includes three first righting claws, the second righting body includes three second righting claws, when the sucker rod moves down, the first righting body is under the action of friction When moving upwards, the first centralizing body and the second centralizing body are separated, and the crude oil flows upward through the gap between the first and second centralizing claws. When the sucker rod moves upward, the first centralizing body is under the action of frictional force. When the sucker rod moves downward, the first centralizer slides into the gap of the second centralizer to form a plunger. When the sucker rod moves upwards and downwards, both the first centralizer and the second centralizer can act as a centralizer to prevent The friction between the sucker rod and the sucker pipe is reduced, and when the sucker rod moves upward, it can also play a role in reducing the pressure difference between the upper and lower plunger, and improve the oil pumping efficiency.

Publication (announcement) No.: CN201100121Y, Publication (announcement) date: 2008-08-13 discloses a pumping-assist device for oil wells used in the petroleum industry, which is suitable for oil wells with rod pumps. The device includes an elastic righting part and a pumping-assisting part, the pumping-assisting part is provided with a liquid flow channel, the elastic righting part is sleeved on the pumping-assisting part, and the device is connected to the sucker rod string. It can reduce the leakage of the oil well pump, form a higher negative pressure in the pump barrel, increase the oil intake, improve the filling coefficient of the oil well pump, and reduce the probability of "liquid hammer" in the oil well pump. When the oil pump is pumping oil on the upper and lower strokes, the stroke loss is reduced by reducing the elastic elongation of the sucker rod during the upward stroke under the action of segmented oil lifting. Through the step-by-step lifting of the well fluid by the device, the leakage at the connection of the tubing can be reduced, and the purpose of improving the pumping efficiency and increasing the crude oil production of a single well can be achieved.

Publication (announcement) number: CN105971528B, publication (announcement) date: 2018-06-01 relates to a sucker rod anti-wear and pumping-assisting and righting device, which belongs to the technical field of oilfield equipment. It includes a steel body, the steel body is a hollow structure, and the steel body is covered with an anti-wear and pumping-assisting structure. Helps with hole extraction. It can centralize the sucker rod in the center of the oil pipe, prevent the sucker rod from eccentric wear, make the friction area between the sucker rod and the oil pipe small, reduce the friction resistance and improve the pump efficiency.

In a word, the technical solutions of the above disclosed technology, the technical problems to be solved and the beneficial effects produced are all different from those of the present invention. For more technical features of the present invention, the technical problems to be solved and the beneficial effects, the above disclosed technical documents do not There are technical implications.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a flexible sucker rod hydraulic pumping aid device and method and a downhole pulling aid cylinder, which are simple in process, high in reliability, and easy to retrofit and install; Avoid pressure rod instability and pipe rod wear; closed cycle of hydraulic fluid stroke, green and energy-saving.

In order to achieve the above object, the present invention adopts the following technical solutions:

A flexible sucker rod hydraulic pumping aid device comprises a flexible sucker rod, a rigid sucker rod, and an oil sucking pump, wherein the lower end of the rigid sucker rod is connected to a plunger of the oil sucking pump;

It also includes downhole puller and ground hydraulic control device;

The upper end of the downhole puller is connected with the lower end of the flexible sucker rod, and the lower end of the downhole puller is connected with the upper end of the rigid sucker rod;

The surface hydraulic control device is communicated with the hydraulic hole of the downhole puller through a hydraulic pipe.

Further, a dynamometer is also included, and the dynamometer is electrically connected to the ground hydraulic control device through a data line.

Further, the downhole pulling aid cylinder includes a piston tube and a piston cylinder;

The center of the piston tube is an axial through hole, and the outer wall of the piston tube has an integrally formed outreach ring plate;

The piston tube passes through the piston cylinder coaxially, and the circumferential surface of the expanding ring plate forms a sliding seal with the inner wall of the piston cylinder, that is, the expanding ring plate is used as a piston in the piston cylinder.

Further, the piston cylinder includes a sealing cylinder, an upper joint, and a lower joint;

The upper joint is connected to the upper port of the sealing cylinder, the center of the upper joint is provided with a central hole of the upper joint for passing through the piston tube, the inner wall of the central hole of the upper joint and the outer wall of the piston tube form a sliding sealing pair, and the upper joint is opened to lead to the sealing Hydraulic holes in the sealing cylinder;

The lower joint is connected to the lower port of the sealing cylinder, the center of the lower joint is provided with a central hole of the lower joint for passing through the piston tube, the inner wall of the central hole of the lower joint and the outer wall of the piston tube form a sliding sealing pair, and the lower joint is opened to connect with the sealing cylinder. Connected balance holes.

Further, the upper joint is also provided with a pressure relief hole that can communicate with the sealing cylinder, a pressure relief valve is installed on the pressure relief hole, the upper end of the upper joint is connected with the oil pipe in the casing, and the lower end of the lower joint is connected with the oil pipe short joint. The upper end of the pump barrel of the oil well pump is connected.

Further, the downhole pulling aid cylinder also includes an upper rod connecting head and a lower rod connecting head;

The upper rod connecting head is installed on the upper port of the piston pipe, and the upper rod connecting head is provided with an axial through hole that can communicate with the piston pipe, and the upper rod connecting head is connected and fixed with the upper flexible sucker rod;

The lower rod connecting head is installed on the lower port of the piston tube, and the lower rod connecting head is provided with an axial through hole which can communicate with the piston tube, and the lower rod connecting head is connected and fixed with the rigid sucker rod below.

Further, the ground hydraulic control device includes a control cabinet, a liquid storage tank, and a solenoid valve;

The solenoid valve has three ports, namely the inlet, the outlet and the return port, wherein the outlet of the solenoid valve is connected with the hydraulic hole of the downhole puller through the hydraulic pipe, and the inlet of the solenoid valve is connected to the liquid storage through the control cabinet and the liquid inlet pipe. The outlet of the tank, wherein the return port of the solenoid valve is connected to the recovery port of the liquid storage tank through the return pipe.

Further, the control cabinet includes a control circuit and a booster pump, the control circuit is electrically connected with the booster pump, the control circuit is electrically connected with the dynamometer, the control circuit is electrically connected with the solenoid valve, and the control circuit is electrically connected with the liquid storage tank. The level sensor of the level gauge is electrically connected.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method of using a flexible sucker rod hydraulic pumping aid device, comprising the following steps:

The dynamometer collects the stroke data of the flexible sucker rod and transmits it to the control cabinet. The control cabinet controls the opening and closing of the solenoid valve and pumps the liquid of the liquid storage tank into the hydraulic pipe according to the collected stroke data and the liquid level data of the liquid storage tank;

When the flexible sucker rod goes down, the control cabinet sends a signal to open the liquid downward injection channel of the solenoid valve, the pump in the control cabinet starts, the liquid in the liquid storage tank is injected into the downhole puller through the hydraulic control tube, and the piston tube is hydraulically operated. Down, and pull the flexible sucker rod down, the well fluid under the piston tube is discharged through the balance hole;

When the flexible sucker rod travels upward, the control cabinet controls the direction of the solenoid valve channel, and the liquid above the piston tube in the downhole puller is returned to the liquid storage tank through the hydraulic pipe, the pressure in the hydraulic pipe is released, and the flexible sucker rod is pulled up when it travels. Under the action, the piston tube moves up, and the pressure above the piston tube in the sealing cylinder is also safely released through the pressure relief hole and pressure relief valve;

After the completion of the downstroke and upstroke, the downhole puller completes its own hydraulic pumping function, and the sucker rod is always in a state of tensile stress to avoid the instability of the pressure rod, resulting in pipe rod wear and other damage to the life of the pipe string. Bad state occurs.

In order to achieve the above object, the present invention adopts the following technical solutions:

A downhole pulling aid cylinder for flexible sucker rod pumping oil, comprising a piston tube and a piston cylinder;

The center of the piston tube is an axial through hole, and the outer wall of the piston tube has an integrally formed outreach ring plate;

The piston tube passes through the piston cylinder coaxially, and the circumferential surface of the expanding ring plate forms a sliding seal with the inner wall of the piston cylinder, that is, the expanding ring plate is used as a piston in the piston cylinder.

Further, the piston cylinder includes a sealing cylinder, an upper joint, and a lower joint;

The upper joint is connected to the upper port of the sealing cylinder, the center of the upper joint is provided with a central hole of the upper joint for passing through the piston tube, the inner wall of the central hole of the upper joint and the outer wall of the piston tube form a sliding sealing pair, and the upper joint is opened to lead to the sealing Hydraulic holes in the sealing cylinder;

The lower joint is connected to the lower port of the sealing cylinder, the center of the lower joint is provided with a central hole of the lower joint for passing through the piston tube, the inner wall of the central hole of the lower joint and the outer wall of the piston tube form a sliding sealing pair, and the lower joint is opened to connect with the sealing cylinder. Connected balance holes.

Further, the upper joint is also provided with a pressure relief hole that can communicate with the sealing cylinder, a pressure relief valve is installed on the pressure relief hole, the upper end of the upper joint is connected with the oil pipe in the casing, and the lower end of the lower joint is connected with the oil pipe short joint. The upper end of the pump barrel of the oil well pump is connected.

Further, the downhole pulling aid cylinder also includes an upper rod connecting head and a lower rod connecting head;

The upper rod connecting head is installed on the upper port of the piston pipe, and the upper rod connecting head is provided with an axial through hole that can communicate with the piston pipe, and the upper rod connecting head is connected and fixed with the upper flexible sucker rod;

The lower rod connecting head is installed on the lower port of the piston tube, and the lower rod connecting head is provided with an axial through hole which can communicate with the piston tube, and the lower rod connecting head is connected and fixed with the rigid sucker rod below.

Compared with the prior art, the present invention has the following beneficial effects:

The invention controls the ground hydraulic control system through the data of the wellhead dynamometer. When the sucker rod goes down, the ground hydraulic pressure makes the piston in the downhole puller go down, and the end of the sucker rod is pulled downward, so that the sucker rod is always in a state of tension stress , to avoid the instability of the pressure rod, resulting in the occurrence of bad conditions such as pipe rod wear that will damage the life of the pipe string.

The invention is suitable for oil production process strings such as flexible sucker rod oil production, conventional rod deep pumping, heavy oil well machine production and the like. It is of great significance to reduce the instability of the compression rod, avoid the wear of the pipe rod, improve the efficiency of the pumping unit system, and prolong the service life of the oil production string, and has a broad application prospect.

Description of drawings

1 is a schematic structural diagram of a flexible sucker rod hydraulic pumping aid device according to the present invention;

FIG. 2 is a schematic structural diagram of the downhole puller of the present invention.

In the figure: flexible sucker rod 1, wellhead dynamometer 2, casing spool 3, tubing 4, casing 5, downhole puller 6, rigid sucker rod 7, oil pump 8, hydraulic pipe 9, control cabinet 10. Liquid storage tank 11 and solenoid valve 12, upper rod connecting head 601, piston tube 602, upper joint 603, pressure relief valve 604, sealing cylinder 605, lower joint 606, and lower rod connecting head 607.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1:

Please refer to FIG. 1 to FIG. 2, the present invention provides a technical solution:

A flexible sucker rod hydraulic pumping aid device, comprising a flexible sucker rod 1, a rigid sucker rod 7, and an oil sucking pump 8, and the lower end of the rigid sucker rod is connected to the plunger of the oil sucking pump;

It also includes a downhole puller 6 and a ground hydraulic control device;

The upper end of the downhole puller is connected with the lower end of the flexible sucker rod, and the lower end of the downhole puller is connected with the upper end of the rigid sucker rod;

The surface hydraulic control device is communicated with the hydraulic hole of the downhole puller through a hydraulic pipe.

Further, a dynamometer 2 is also included, and the dynamometer is electrically connected to the ground hydraulic control device through a data cable.

Further, the downhole pulling aid cylinder includes a piston tube 602 and a piston cylinder;

The center of the piston tube is an axial through hole, and the outer wall of the piston tube has an integrally formed outreach ring plate;

The piston tube passes through the piston cylinder coaxially, and the circumferential surface of the expanding ring plate forms a sliding seal with the inner wall of the piston cylinder, that is, the expanding ring plate is used as a piston in the piston cylinder.

Further, the piston cylinder includes a sealing cylinder 605, an upper joint 603, and a lower joint 606;

The upper joint is connected to the upper port of the sealing cylinder, the center of the upper joint is provided with a central hole of the upper joint for passing through the piston tube, the inner wall of the central hole of the upper joint and the outer wall of the piston tube form a sliding sealing pair, and the upper joint is opened to lead to the sealing Hydraulic hole 6032 in the sealing cylinder;

The lower joint is connected to the lower port of the sealing cylinder, the center of the lower joint is provided with a central hole of the lower joint for passing through the piston tube, the inner wall of the central hole of the lower joint and the outer wall of the piston tube form a sliding sealing pair, and the lower joint is opened to connect with the sealing cylinder. Connected balance holes.

Further, the upper joint is also provided with a pressure relief hole 6031 that can communicate with the sealing cylinder, a pressure relief valve 604 is installed on the pressure relief hole, the upper end of the upper joint is connected with the oil pipe 4 in the casing 5, and the lower end of the lower joint is connected. It is connected with the upper end of the pump barrel of the oil well pump through the short joint of the oil pipe.

Further, the downhole puller also includes an upper rod connecting head 601 and a lower rod connecting head 607;

The upper rod connecting head is installed on the upper port of the piston pipe, and the upper rod connecting head is provided with an axial through hole that can communicate with the piston pipe, and the upper rod connecting head is connected and fixed with the upper flexible sucker rod;

The lower rod connecting head is installed on the lower port of the piston tube, and the lower rod connecting head is provided with an axial through hole which can communicate with the piston tube, and the lower rod connecting head is connected and fixed with the rigid sucker rod below.

Further, the ground hydraulic control device includes a control cabinet 10, a liquid storage tank 11, and a solenoid valve 12;

The solenoid valve has three ports, namely the inlet, the outlet and the return port, wherein the outlet of the solenoid valve is connected with the hydraulic hole of the downhole puller through the hydraulic pipe, and the inlet of the solenoid valve is connected to the liquid storage through the control cabinet and the liquid inlet pipe. The outlet of the tank, wherein the return port of the solenoid valve is connected to the recovery port of the liquid storage tank through the return pipe.

Further, the control cabinet includes a control circuit and a booster pump, the control circuit is electrically connected with the booster pump, the control circuit is electrically connected with the dynamometer, the control circuit is electrically connected with the solenoid valve, and the control circuit is electrically connected with the liquid storage tank. The level sensor of the level gauge is electrically connected.

Referring to Figure 1, the wellhead dynamometer 2 is installed on the top of the oil well Christmas tree, the lower end of the flexible sucker rod 1 is connected to the upper end of the downhole puller 6, the lower end of the downhole puller 6 is connected to the rigid sucker rod 7, and the rigid sucker rod 7 is connected to the pump. The oil pump 8, at the same time, the downhole puller 6 is connected to the oil pipe 4 and goes into the casing 5, and the rigid sucker rod 7 is covered with an oil pipe. The hydraulic hole of the downhole puller 6 is connected by the sealing nail 901, and the upper end passes through the casing spool 3 (connected and sealed by the multi-tube passing through the sealing plug 902) and is connected with the solenoid valve 12, and the solenoid valve 12 and the liquid storage tank 11. The solenoid valve 12 and the control cabinet 10 also have a liquid supply pipe connected through the liquid return pipe 1202, a liquid inlet pipe 1102 is connected between the control cabinet 10 and the liquid storage tank 11, the wellhead dynamometer 2 is connected with the control cabinet 10 and the electromagnetic Data signals are transmitted between the valve 12 and the control cabinet 10 and the liquid level sensor of the liquid storage tank 11 and the control cabinet 10 through cables 201, 1201 and 1101, respectively.

The middle part of the upper rod connector 601 in the downhole puller 6 is connected to the lower end of the flexible sucker rod 1, the outer cylindrical surface is threadedly connected to the upper end of the piston tube 602, the piston tube 602 is inserted into the sealing tube 605, and the upper and lower ends of the sealing tube 605 are respectively screwed to the upper end. The joint 603 and the lower joint 606 are provided with a pressure relief hole 6031 on one side of the upper joint 603, a pressure relief valve 604 is installed on the pressure relief hole 6031, a hydraulic hole 6032 is arranged on the other side of the upper joint 603, and the balance holes are evenly distributed in the circumferential direction of the lower joint 606 6061, the middle part of the lower rod connecting head 607 can be connected to the lower rigid sucker rod 7, and the outer cylindrical surface is threadedly connected to the lower end of the piston tube 602.

In field application, after the device described in the invention is equipped with a pipe to go down the well, a hydraulic pumping-assisting method for a flexible sucker rod according to the invention is implemented, and the stroke data of the flexible sucker rod 1 is collected by the wellhead dynamometer 2 and transmitted to the control system. The control cabinet 10 controls the opening and closing of the solenoid valve 12 and pumps the liquid of the liquid storage tank 11 into the hydraulic pipe 9 according to the collected travel data and the liquid level data of the liquid storage tank 11 . For example, when the flexible sucker rod 1 goes down, the control cabinet 10 sends a signal to open the downward injection channel of the solenoid valve 12, the pump in the control cabinet 10 is started, and the liquid in the liquid storage tank 11 is injected into the downhole puller 6 through the hydraulic control pipe 9. , the piston tube 602 goes down under the action of hydraulic pressure, and pulls the flexible sucker rod 1 to go down, and the well fluid under the piston tube 602 is discharged through the balance hole 6061 . When the flexible sucker rod 1 travels up, the control cabinet 10 controls the solenoid valve 12 to reverse the direction of the liquid flow channel, and the liquid above the piston tube 602 of the downhole puller 6 returns to the liquid storage tank 11 through the hydraulic tube 9, and the pressure in the hydraulic tube 9 is released. , Under the action of the upward stroke pulling force of the flexible sucker rod 1, the piston tube 602 moves upward, and the excess pressure formed above the piston tube 602 in the sealing cylinder 605 can be safely released through the pressure relief hole 6031 and the pressure relief valve 604.

The ground hydraulic control system is controlled by the data of the wellhead dynamometer. The technology of this dynamometer to control the hydraulic system and the related technology itself are widely used in the field and are the existing technology, and the control can be directly applied, and details are not repeated here. The control process is clear to those skilled in the art.

The invention controls the ground hydraulic control system through the data of the wellhead dynamometer. When the sucker rod goes down, the ground hydraulic pressure makes the piston in the downhole puller go down, and the end of the sucker rod is pulled downward, so that the sucker rod is always in a state of tension stress , to avoid the instability of the pressure rod, resulting in the occurrence of bad conditions such as pipe rod wear that will damage the life of the pipe string.

The invention is suitable for oil production process strings such as flexible sucker rod oil production, conventional rod deep pumping, heavy oil well machine production and the like. It is of great significance to reduce the instability of the compression rod, avoid the wear of the pipe rod, improve the efficiency of the pumping unit system, and prolong the service life of the oil production string, and has a broad application prospect.

Example 2:

Please refer to FIG. 1 to FIG. 2, the present invention provides a technical solution:

A flexible sucker rod hydraulic pumping aid device, comprising a flexible sucker rod 1, a rigid sucker rod 7, and an oil sucking pump 8, and the lower end of the rigid sucker rod is connected to the plunger of the oil sucking pump;

It also includes a downhole puller 6 and a ground hydraulic control device;

The upper end of the downhole puller is connected with the lower end of the flexible sucker rod, and the lower end of the downhole puller is connected with the upper end of the rigid sucker rod;

The surface hydraulic control device is communicated with the hydraulic hole of the downhole puller through a hydraulic pipe.

Further, the downhole pulling aid cylinder includes a piston tube 602 and a piston cylinder;

The center of the piston tube is an axial through hole, and the outer wall of the piston tube has an integrally formed outreach ring plate;

The piston tube passes through the piston cylinder coaxially, and the circumferential surface of the expanding ring plate forms a sliding seal with the inner wall of the piston cylinder, that is, the expanding ring plate is used as a piston in the piston cylinder.

Further, the piston cylinder includes a sealing cylinder 605, an upper joint 603, and a lower joint 606;

The upper joint is connected to the upper port of the sealing cylinder, the center of the upper joint is provided with a central hole of the upper joint for passing through the piston tube, the inner wall of the central hole of the upper joint and the outer wall of the piston tube form a sliding sealing pair, and the upper joint is opened to lead to the sealing Hydraulic hole 6032 in the sealing cylinder;

The lower joint is connected to the lower port of the sealing cylinder, the center of the lower joint is provided with a central hole of the lower joint for passing through the piston tube, the inner wall of the central hole of the lower joint and the outer wall of the piston tube form a sliding sealing pair, and the lower joint is opened to connect with the sealing cylinder. Connected balance holes.

Further, the upper joint is also provided with a pressure relief hole 6031 that can communicate with the sealing cylinder, a pressure relief valve 604 is installed on the pressure relief hole, the upper end of the upper joint is connected with the oil pipe 4 in the casing 5, and the lower end of the lower joint is connected. It is connected with the upper end of the pump barrel of the oil well pump through the short joint of the oil pipe.

Further, the downhole puller also includes an upper rod connecting head 601 and a lower rod connecting head 607;

The upper rod connecting head is installed on the upper port of the piston pipe, and the upper rod connecting head is provided with an axial through hole that can communicate with the piston pipe, and the upper rod connecting head is connected and fixed with the upper flexible sucker rod;

The lower rod connecting head is installed on the lower port of the piston tube, and the lower rod connecting head is provided with an axial through hole which can communicate with the piston tube, and the lower rod connecting head is connected and fixed with the rigid sucker rod below.

Example 3:

Please refer to FIG. 1 to FIG. 2, the present invention provides a technical solution:

A downhole pulling aid barrel, the downhole pulling aid barrel includes a piston tube 602 and a piston cylinder;

The center of the piston tube is an axial through hole, and the outer wall of the piston tube has an integrally formed outreach ring plate;

The piston tube passes through the piston cylinder coaxially, and the circumferential surface of the expanding ring plate forms a sliding seal with the inner wall of the piston cylinder, that is, the expanding ring plate is used as a piston in the piston cylinder.

Further, the piston cylinder includes a sealing cylinder 605, an upper joint 603, and a lower joint 606;

The upper joint is connected to the upper port of the sealing cylinder, the center of the upper joint is provided with a central hole of the upper joint for passing through the piston tube, the inner wall of the central hole of the upper joint and the outer wall of the piston tube form a sliding sealing pair, and the upper joint is opened to lead to the sealing Hydraulic hole 6032 in the sealing cylinder;

The lower joint is connected to the lower port of the sealing cylinder, the center of the lower joint is provided with a central hole of the lower joint for passing through the piston tube, the inner wall of the central hole of the lower joint and the outer wall of the piston tube form a sliding sealing pair, and the lower joint is opened to connect with the sealing cylinder. Connected balance holes.

Further, the upper joint is also provided with a pressure relief hole 6031 that can communicate with the sealing cylinder, a pressure relief valve 604 is installed on the pressure relief hole, the upper end of the upper joint is connected with the oil pipe 4 in the casing 5, and the lower end of the lower joint is connected. It is connected with the upper end of the pump barrel of the oil well pump through the short joint of the oil pipe.

Further, the downhole puller also includes an upper rod connecting head 601 and a lower rod connecting head 607;

The upper rod connecting head is installed on the upper port of the piston pipe, and the upper rod connecting head is provided with an axial through hole that can communicate with the piston pipe, and the upper rod connecting head is connected and fixed with the upper flexible sucker rod;

The lower rod connecting head is installed on the lower port of the piston tube, and the lower rod connecting head is provided with an axial through hole which can communicate with the piston tube, and the lower rod connecting head is connected and fixed with the rigid sucker rod below.

Although all the above embodiments use FIGS. 1 to 2 , as those skilled in the art can clearly know that there is no need to give a separate drawing to represent, as long as the missing parts or structural features in the embodiments are in the drawings Just take it off. This will be clear to those skilled in the art. Of course, an embodiment with more components or structural features is only an optimal embodiment, and an embodiment with fewer components is a basic embodiment, but it can also achieve the basic purpose of the present invention, so all these modified embodiments are protected by the present invention within the range.

All the components themselves that are not discussed in this application and the connection methods of each component in this application belong to the well-known technology in the technical field, and will not be described again. Such as welding, threaded connections, etc.

In the present invention, the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the orientations shown in the accompanying drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or unit must have a specific direction, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. A hydraulic pumping-aid device of a flexible sucker rod comprises a flexible sucker rod, a rigid sucker rod and an oil well pump, wherein the lower end of the rigid sucker rod is connected with a plunger of the oil well pump;

it is characterized by also comprising an underground pulling-assistant cylinder and a ground hydraulic control device;

the upper end of the underground pull-assisting cylinder is connected with the lower end of the flexible sucker rod, and the lower end of the underground pull-assisting cylinder is connected with the upper end of the rigid sucker rod;

and the ground hydraulic control device is communicated with a hydraulic hole of the underground pulling-assisting cylinder through a hydraulic pipe.

2. The hydraulic pumping-assistant device of the flexible sucker rod of claim 1, further comprising a power indicator electrically connected with the ground hydraulic control device through a data line.

3. The flexible sucker rod hydraulic pumping aid device according to claim 1 or 2, wherein the downhole pulling aid cylinder comprises a piston tube and a piston cylinder;

the center of the piston tube is an axial through hole, and the outer wall of the piston tube is provided with an integrally formed flared annular plate;

the piston pipe coaxially penetrates through the piston cylinder, the circumferential surface of the outward-extending ring plate and the inner wall of the piston cylinder form a sliding seal, and the outward-extending ring plate is used as a piston in the piston cylinder.

4. The hydraulic pumping aid device of claim 3, wherein the piston cylinder comprises a sealing cylinder, an upper joint and a lower joint;

the upper joint is connected with an upper port of the sealing cylinder, an upper joint center hole for penetrating through the piston pipe is formed in the center of the upper joint, a sliding sealing pair is formed by the inner wall of the upper joint center hole and the outer wall of the piston pipe, and a hydraulic hole capable of leading to the inside of the sealing cylinder is formed in the upper joint;

the lower joint is connected at port under the sealing barrel, and the lower joint centre bore that is used for passing the piston pipe is seted up at the lower joint center, and lower joint centre bore inner wall constitutes sliding seal pair with piston pipe outer wall, the balancing hole that can communicate with the sealing barrel is seted up to the lower joint.

5. The hydraulic pumping-aid device of claim 4, wherein the upper joint is further provided with a pressure relief hole capable of communicating with the sealing cylinder, the pressure relief hole is provided with a pressure relief valve, the upper end of the upper joint is connected with an oil pipe in the casing, and the lower end of the lower joint is connected with the upper end of the pump cylinder of the oil-well pump through an oil pipe nipple.

6. The hydraulic pumping aid device of claim 4 or 5, wherein the downhole pumping aid cylinder further comprises an upper rod connector and a lower rod connector;

the upper rod connector is arranged at the upper port of the piston pipe, an axial through hole capable of being communicated with the piston pipe is formed in the upper rod connector, and the upper rod connector is fixedly connected with the flexible sucker rod above the upper rod connector;

the lower rod connector is arranged at the lower port of the piston pipe, an axial through hole capable of being communicated with the piston pipe is formed in the lower rod connector, and the lower rod connector is fixedly connected with a rigid sucker rod below the lower rod connector.

7. The flexible sucker rod hydraulic pumping aid device according to claim 1, 2, 4 or 5, wherein the ground hydraulic control device comprises a control cabinet, a liquid storage tank and an electromagnetic valve;

the electromagnetic valve is provided with three ports, namely an inlet, an outlet and a return port, wherein the outlet of the electromagnetic valve is communicated with the hydraulic hole of the underground pulling-assisting cylinder through a hydraulic pipe, the inlet of the electromagnetic valve is connected with the outlet of the liquid storage tank through a control cabinet and a liquid inlet pipe, and the return port of the electromagnetic valve is connected with the recovery port of the liquid storage tank through a liquid return pipe.

8. The hydraulic pumping-assistant device of claim 7, wherein the control cabinet comprises a control circuit and a booster pump, the control circuit is electrically connected with the indicator, the control circuit is electrically connected with the solenoid valve, and the control circuit is electrically connected with a liquid level sensor of a liquid level meter in the liquid storage tank.

9. The use method of the flexible sucker rod hydraulic pumping-assistant device is characterized by comprising the following steps:

the dynamometer acquires stroke data of the flexible sucker rod and transmits the stroke data to the control cabinet, and the control cabinet controls the opening and closing of the electromagnetic valve and pumps liquid in the liquid storage tank into the hydraulic pipe according to the acquired stroke data and the liquid level data of the liquid storage tank;

when the flexible sucker rod moves downwards, the control cabinet sends a signal to open a liquid descending injection channel of the electromagnetic valve, a pump in the control cabinet is started, liquid in the liquid storage tank is injected into the underground pulling-assisted cylinder through the liquid control pipe, the piston pipe descends under the hydraulic action and pulls the flexible sucker rod to descend, and well liquid below the piston pipe is discharged through the balance hole;

when the flexible sucker rod travels upwards, the control cabinet controls the electromagnetic valve channel to change direction, liquid above the piston pipe in the underground pulling-assisted cylinder flows back to the liquid storage tank through the hydraulic pipe, pressure in the hydraulic pipe is released, the piston pipe moves upwards under the action of the tension of the upper travel of the flexible sucker rod, and pressure above the piston pipe in the sealing cylinder is also safely released through the pressure release hole and the pressure release valve;

after the completion of the lower stroke and the upper stroke, the underground pull-assisting cylinder completes the self hydraulic pumping-assisting function, and meanwhile, the sucker rod is always in a tensile stress state, so that the bad states such as pipe rod abrasion and the like which damage the service life of the pipe column are avoided.

10. An underground pull-assisting cylinder for pumping oil by a flexible sucker rod is characterized by comprising a piston pipe and a piston cylinder;

the center of the piston tube is an axial through hole, and the outer wall of the piston tube is provided with an integrally formed flared annular plate;

the piston pipe coaxially penetrates through the piston cylinder, the circumferential surface of the flared annular plate and the inner wall of the piston cylinder form a sliding seal, and the flared annular plate is used as a piston in the piston cylinder.

11. The downhole pulling aid for pumping with a flexible sucker rod of claim 10 wherein the piston cylinder comprises a sealing cylinder, an upper sub, a lower sub;

the upper joint is connected with an upper port of the sealing cylinder, an upper joint center hole for penetrating through the piston pipe is formed in the center of the upper joint, a sliding sealing pair is formed by the inner wall of the upper joint center hole and the outer wall of the piston pipe, and a hydraulic hole capable of leading to the inside of the sealing cylinder is formed in the upper joint;

the lower joint is connected at port under the sealed section of thick bamboo, and the lower joint centre bore that is used for passing the piston pipe is seted up at the lower joint center, and lower joint centre bore inner wall constitutes sliding seal pair with the piston pipe outer wall, the balancing hole that can communicate with a sealed section of thick bamboo is seted up to the lower joint.

12. The downhole pulling aid cylinder for pumping by the flexible sucker rod as claimed in claim 10, wherein the upper joint is further provided with a pressure relief hole capable of communicating with the sealing cylinder, a pressure relief valve is installed on the pressure relief hole, the upper end of the upper joint is connected with an oil pipe in the casing, and the lower end of the lower joint is connected with the upper end of the pump cylinder of the oil well pump through an oil pipe nipple.

13. The downhole pulling aid for pumping with the flexible sucker rod of claim 11 or 12, wherein the downhole pulling aid further comprises an upper rod connector and a lower rod connector;

the upper rod connector is arranged at the upper port of the piston pipe, an axial through hole capable of being communicated with the piston pipe is formed in the upper rod connector, and the upper rod connector is fixedly connected with the flexible sucker rod above the upper rod connector;

the lower rod connector is installed at the lower port of the piston pipe, an axial through hole capable of being communicated with the piston pipe is formed in the lower rod connector, and the lower rod connector is fixedly connected with a rigid sucker rod below the lower rod connector.

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