CN209892129U

CN209892129U - Well washing device

Info

Publication number: CN209892129U
Application number: CN201920269466.XU
Authority: CN
Inventors: 钟小宏; 卫丽霞; 李小奇; 尹明; 唐玉成; 杜俊玲
Original assignee: China Petrochemical Corp; Sinopec Zhongyuan Oilfield Co No 1 Oil Production Plant
Current assignee: China Petroleum and Chemical Corp; China Petrochemical Corp; Sinopec Zhongyuan Oilfield Co No 1 Oil Production Plant
Priority date: 2019-03-04
Filing date: 2019-03-04
Publication date: 2020-01-03
Anticipated expiration: 2029-03-04

Abstract

The utility model relates to an oil gas field apparatus for producing technical field, concretely relates to well washing device can solve and use the packer of taking the slips or take the well washing device of slips to produce the problem of easily blocking the tubular column easily among the prior art. The well washing device comprises a central pipe, wherein the central pipe comprises an upper joint and a supporting pipe which are in threaded connection from top to bottom, and a lower joint which is in threaded connection with the lower end of the supporting pipe, an interference rubber cylinder is arranged on the supporting pipe, a liquid inlet channel which is used for communicating an inner cavity of the central pipe with an external oil jacket annulus is arranged on the upper joint and/or the supporting pipe, a backwashing piston which is used for plugging the liquid inlet channel is arranged in the upper joint in a movable sealing mode along the vertical direction, the backwashing piston, the upper joint and the supporting pipe form a pressure cavity in a surrounding mode, and a liquid inlet which is used for enabling well washing liquid to enter the.

Description

Well washing device

Technical Field

The utility model relates to an oil gas field apparatus for producing technical field, concretely relates to well-flushing device.

Background

In the prior art, when an oil well is washed, the formation pressure of the oil well is low, on one hand, a well washing medium can enter an oil layer and sensitive minerals in oil layer rocks to generate phenomena of acid sensitivity, water sensitivity, speed sensitivity, salt sensitivity and the like, so that the bore of the reservoir is narrowed, the permeability of the oil layer is reduced, and the productivity of the oil well is reduced or even stops production. On the other hand, the oil well after the well washing process requires 2 to 3 days for discharging, and some oil wells require even more than one week, which affects the yield of the oil well. For example, in the process of hot washing and paraffin removal of some oil wells with strong stratum sensitivity, serious leakage and low energy, the cleaning solution cannot be discharged from the stratum in time to cause stratum pollution, the flushing solution cannot leak into the stratum in time to cause wax scale to block an oil well pump, and in order to prevent the oil well from being also polluted by washing or the oil well pump from being blocked in the process of flushing, an anti-pollution flushing device and an anti-pollution flushing pipe column are mainly adopted at present. Wherein, anti-pollution well-flushing tubular column includes tubular column, foraminiferous packer and check valve, and wherein, foraminiferous packer is equipped with oil jacket through-hole and slips, keeps apart oil pipe and sleeve pipe space through foraminiferous packer setting and check valve, and liquid enters into the oil-well pump through the oil jacket through-hole of check valve and foraminiferous packer in, and can not advance the stratum.

However, in the actual production process, the slips of the perforated packer can not be recycled easily due to corrosion and scaling, the tubular column is easy to be clamped, the tubular column needs to be overhauled, the perforated packer is easy to cause the bending of the oil pipe after being set, the sucker rod and the oil pipe are worn and scrapped, and the problems of the well washing device using the slips also exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a well washing device can solve and use the packer of taking the slips or take the well washing device of slips to produce the problem of easily blocking the tubular column among the prior art easily.

In order to achieve the purpose, the utility model provides a well washing device adopts following technical scheme:

the well washing device comprises a central tube, wherein the central tube comprises an upper connector and a supporting tube which are in threaded connection from top to bottom, and a lower connector which is in threaded connection with the lower end of the supporting tube, an interference rubber cylinder is arranged on the supporting tube, a liquid inlet channel which is used for communicating an inner cavity of the central tube with an external oil jacket annulus is arranged on the upper connector and/or the supporting tube, a backwashing piston which is used for plugging the liquid inlet channel is movably assembled in the upper connector in a sealing mode along the vertical direction, the backwashing piston, the upper connector and the supporting tube form a pressure cavity in a surrounding mode, and a liquid inlet which is used for enabling well washing liquid to enter the.

The beneficial effects are that: the interference rubber cylinder is used as a part for realizing the setting of the well washing device, the interference rubber cylinder is provided with an opening, and when well washing liquid enters the interference rubber cylinder through the opening, the inner wall of the interference rubber cylinder can be pressed and outwards opened so as to abut against the inner side surface of the sleeve to realize the setting. The interference sleeve does not need an operator to perform setting or unsetting operation on the part independently, but deforms correspondingly according to whether the flushing fluid exists in the interference sleeve, so that the operation is simple, and compared with the slips in the prior art, the deformation of the interference rubber sleeve is not dependent on a mechanical structure, the property is stable, and the problem of pipe column blocking is avoided; and through the split type assembling method of the upper joint, the supporting tube and the lower joint, technicians can assemble the interference rubber cylinder and the backwashing piston more conveniently.

Further, the well washing device also comprises a spring for applying force to the backwashing piston to force the backwashing piston to move so as to block the liquid inlet channel.

The beneficial effects are that: the spring is added in the well washing device, so that the action of the backwashing piston is more flexible and stable, and the risk of failure of the backwashing piston is reduced.

Furthermore, a guide liner tube is fixedly connected in the upper joint and is in guide fit with the backwashing piston, the spring is sleeved outside the guide liner tube, one end of the spring is propped against the end face of the upper joint, and the other end of the spring is propped against the backwashing piston.

The beneficial effects are that: the guide liner tube is added in the well washing device, so that the action of the backwashing piston is more stable.

Furthermore, the upper part of the backwashing piston is sealed with the upper joint, and the lower part of the backwashing piston is sealed with the supporting pipe.

The beneficial effects are that: the backwashing piston is respectively sealed with the upper joint and the supporting pipe, so that the phenomenon that flushing liquid enters the pipe column without passing through the liquid inlet channel is avoided, and the pressure of a pressure cavity of the backwashing piston is not enough to enable the backwashing piston to block the liquid inlet channel in the backwashing process.

Further, the lower part of the backwashing piston is sealed with the supporting pipe through a V-shaped sealing element.

The beneficial effects are that: the V-shaped sealing element is used, the dynamic sealing fit of the backwashing piston and the supporting tube can be guaranteed, and the V-shaped sealing element is simple in structure, mature in technology and low in cost.

Furthermore, at least two interference rubber cylinders are sequentially arranged on the supporting tube along the vertical direction.

The beneficial effects are that: the number of the interference rubber cylinders is increased on the supporting pipes, so that the safety and the reliability of the well washing device setting can be improved.

Drawings

FIG. 1 is a schematic diagram of a backwash piston of a well flushing apparatus according to the present invention;

fig. 2 is a schematic diagram of the upward movement of the backwashing piston of the well flushing device of the present invention.

In the figure: 1. an upper joint; 101. a liquid inlet; 2. guiding a liner tube; 3. a spring; 4. a seal ring; 5. backwashing the piston; 501. a piston step; 6. pressing a ring; 7. supporting a tube; 8. interference fit rubber cylinders; 9. a support ring; 10. a supporting seat; 11. an adjusting ring; 12. and a lower joint.

Detailed Description

The present invention will now be described with reference to the accompanying drawings.

As shown in figure 1, for the structure schematic diagram of the well-flushing device of the utility model, the well-flushing device is connected in the pipe column when in use, and an oil sleeve annulus is formed between the outer peripheral surface of the well-flushing device and the sleeve. The well washing device comprises a central pipe forming a device main body, wherein the central pipe is of a split structure and is formed by connecting various parts. A backwash section arranged on the outer peripheral surface of the base pipe in an up-down direction when the base pipe is in use and a setting section that effects setting of the well-flushing device within the casing.

Wherein, the center tube is including being located the direction bushing pipe 2 of well-flushing device top, and the upper and lower both ends of direction bushing pipe 2 have and carry out the screw thread of being connected fixedly with corresponding structure, and the upper end of direction bushing pipe 2 is equipped with the joint of being connected with other tubular columns. The outer side of the guide liner tube 2 is provided with an upper joint 1, the upper joint 1 is provided with an inner cavity for the guide liner tube 2 to be installed, the guide liner tube 2 is fixed with the upper joint 1 through threads at the upper end, an interval is further arranged between the upper joint 1 and the guide liner tube 2, a backwashing piston 5 which can move under external force is arranged in the interval, the backwashing piston 5 is directly sleeved on the outer peripheral surface of the guide liner tube 2, and a sealing ring 4 for ensuring the sealing between the backwashing piston 5 and the upper joint 1 is arranged between the backwashing piston 5 and the upper joint 1. In the space between the upper joint 1 and the guide liner pipe 2, a spring 3 for pushing a backwashing piston 5 is also arranged.

An upper joint 1 through hole communicated with the inner side space and the outer side space of the upper joint 1 is formed in the upper joint 1, and the backwashing piston 5 blocks the liquid inlet channel when external force is not applied. The inlet channel is not in communication with the inlet 101. When the backwash piston 5 is moved in the gap by an external force, the liquid inlet 101 is opened, and an overflow passage is formed corresponding to the liquid inlet passage. The flushing fluid can enter the central pipe through the overflowing channel and return to the bottom surface through the pipe column to realize backwashing. The upper joint 1 and the backwashing piston 5 are matched to form a backwashing part positioned above the well washing device.

The lower part of the backwashing piston 5 is matched with a supporting pipe 7 which is positioned below the well washing device and is used as a part for forming a central pipe through a V-shaped sealing ring, the tail part of the backwashing piston 5 is sleeved in the supporting pipe 7, the V-shaped sealing ring on the backwashing piston 5 is in sealing fit with one side of the upper end of the supporting pipe 7, and the other side of the backwashing piston 5 is directly fixedly connected with the lower end of the upper connector 1 through threads. And a pressing ring 6 fixedly connected with a supporting pipe 7 for supporting the V-shaped sealing ring is arranged below the V-shaped sealing ring of the backwashing piston 5. An interference rubber sleeve 8 for forming a setting part is fixed on the outer peripheral surface of the supporting tube 7, the interference rubber sleeve 8 can adopt a leather cup structure as disclosed in the patent document with the publication number of CN2359448Y, two interference rubber sleeves 8 are arranged along the up-down direction, the interference rubber sleeves 8 arranged along the up-down direction are defined as a first rubber sleeve and a second rubber sleeve respectively, a supporting component fixed on the supporting tube 7 for supporting the first rubber sleeve is arranged at the bottom end of the first rubber sleeve, and the supporting component comprises a supporting ring 9 and a supporting seat 10. The bottom of the second packing element is provided with a lower joint 12 in the bottom of the supporting tube 7 in a screwed mode, the outside of the lower joint 12 is provided with an adjusting ring 11 which is used for supporting the second packing element and can adjust the position of the second packing element, the lower joint 12 is provided with an external thread, the adjusting ring 11 is provided with an internal thread corresponding to the external thread, and the adjustment of the position of the second packing element can be achieved by rotating the adjusting ring 11.

The interference rubber cylinder 8 is provided with an opening which opens towards one side of the upper joint 1, the specific structure of the interference rubber cylinder is bowl-shaped, and the opening is a flaring structure of which the inner wall is obliquely arranged to open towards one side of the upper joint 1. Have the space that forms by the opening after opening between interference packing element 8's opening and center tube, open-ended inner wall can outwards expand when the atress in order to support and lean on the sheathed tube inside wall, realizes setting up the oil jacket annular space of both sides about interference packing element 8. And the inner wall of the opening also forms a bearing surface for opening the opening.

As shown in fig. 2, use at operating personnel the utility model provides a during well-flushing device, with this device through articulate in the tubular column and transfer, make well-flushing device be located oil reservoir upper portion to pour into the well-flushing liquid into through the empty oil well of oil jacket ring, the well-flushing liquid is along the annular space of oil jacket ring until meetting the interference packing element 8 that has a mouth all the time, interference packing element 8 is transferring the in-process of tubular column, and its load-carrying face does not have the atress, and the opening of interference packing element 8 does not open, can transfer smoothly. After the flushing fluid enters the space formed by the opening of the interference rubber cylinder 8, pressure is applied to the bearing surface of the interference rubber cylinder 8, after the bearing surface is pressed, the opening of the interference rubber cylinder 8 is outwards opened to abut against the inner wall of the sleeve, along with the continuous entering of the flushing fluid, the pressure borne by the interference rubber cylinder 8 is also increasingly large, and at the moment, the opening of the interference rubber cylinder 8 swings outwards to realize complete setting. The flushing liquid can not continue to move downwards after the interference rubber cylinder 8 is completely set, and can enter between the upper connector 1 and the backwashing piston 5 through the liquid inlet 101, a piston step 501 is arranged on the position, corresponding to the liquid inlet 101, of the backwashing piston 5, and the piston step 501, corresponding to the upper connector 1 and the supporting pipe 7, form a pressure cavity. The pressure is exerted on the surface of the piston step 501 by the well washing liquid to push the backwashing piston 5 to overcome the elasticity of the spring 3 and move upwards, at the moment, the backwashing piston 5 moves upwards, the V-shaped sealing ring at the bottom of the backwashing piston 5 is separated from the inner wall of the supporting pipe 7, the pipe orifice of the supporting pipe 7 is not blocked by the bottom of the backwashing piston 5, and a gap between the bottom of the backwashing piston 5 and the top of the supporting pipe 7 forms a liquid inlet channel for the well washing liquid to enter from the liquid inlet 101 into the central pipe.

The well-flushing fluid enters the central tube through an overflowing channel formed by the liquid inlet 101 and the liquid inlet channel, washes wax scales in the tubular column, and brings the wax scales back to the ground through the well-flushing fluid. And the operator injects the flushing fluid into the oil well through the oil sleeve annulus until the flushing fluid injected into the oil sleeve annulus is consistent with the flushing fluid returned from the pipe column, so as to achieve the aim of backwashing. After the pipe column is subjected to reverse washing, the well washing liquid is stopped being injected, the bearing surface of the interference rubber cylinder 8 does not bear large pressure at the moment, the deformation can be recovered, the reverse washing piston 5 retracts after being subjected to the elastic force of the spring 3, the liquid inlet 101 in the upper connector 1 is plugged, the overflowing channel is closed, and the inner side and the outer side of the central pipe are cut off again.

In other embodiments, the interference rubber barrel arranged on the well washing device can be set into different shapes, the inner side surface of the barrel wall of the interference rubber barrel is arranged along the vertical direction, so that the interference rubber barrel is provided with a cylindrical inner cavity, when the inner cavity is filled with well washing liquid, the barrel wall of the whole rubber barrel can expand outwards to contact with the inner wall of the sleeve and realize the setting of the well washing device.

In other embodiments, the spring for pushing the backwashing piston can be arranged in the well washing device, and the gravity of the backwashing piston is used for resetting the backwashing piston.

In other embodiments, the liquid inlet channel may also be correspondingly disposed on the backwash piston, the bottom of the backwash piston is provided with an opening, when the backwash piston does not act, the opening is located in the support pipe and is blocked by the support pipe, when the backwash piston is pressed upwards, the opening is exposed out of the support pipe along with the upward movement of the backwash piston, at this time, the flushing liquid enters the central pipe through the opening, and the opening also forms the liquid inlet channel of the flushing device.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Well washing device, its characterized in that: the device comprises a central tube, wherein the central tube comprises an upper connector and a supporting tube which are connected by upper and lower threads, and a lower connector which is connected by the lower threads at the lower end of the supporting tube, an interference rubber cylinder is arranged on the supporting tube, a liquid inlet channel which is used for communicating an inner cavity of the central tube with an external oil sleeve annulus is arranged on the upper connector and/or the supporting tube, a backwashing piston which is used for plugging the liquid inlet channel is movably assembled in the upper connector in a sealing way along the upper and lower directions, a pressure cavity is formed by the backwashing piston, the upper connector and the supporting tube, and a liquid inlet which is used for enabling well washing liquid.

2. The well-flushing apparatus of claim 1, wherein: the well-flushing device also comprises a spring for applying a force to the backwash piston to force the backwash piston to move to block the liquid inlet channel.

3. A well-flushing apparatus as claimed in claim 2, wherein: and a guide liner tube is fixedly connected in the upper joint and is in guide fit with the backwashing piston, the spring is sleeved outside the guide liner tube, one end of the spring is pressed against the end surface of the upper joint, and the other end of the spring is pressed against the backwashing piston.

4. A well-flushing apparatus as claimed in any one of claims 1 to 3, wherein: the upper part of the backwashing piston is sealed with the upper joint, and the lower part of the backwashing piston is sealed with the supporting pipe.

5. The well-flushing apparatus of claim 4, wherein: the lower part of the backwashing piston is sealed with the supporting pipe through a V-shaped sealing piece.

6. A well-flushing apparatus as claimed in any one of claims 1 to 3, wherein: at least two interference rubber cylinders are sequentially arranged on the supporting tube along the up-down direction.