CN114562240A - Bypass gas lift working barrel for oil and gas field - Google Patents

Abstract

The invention relates to a bypass gas lift working cylinder for oil and gas fields, comprising the following components: an upper joint, an elliptical eccentric cylinder and a lower joint connected in series in sequence, the upper joint and the lower joint are hollow cylindrical structures, and the two are located at the same On the center line of a main diameter, the elliptical eccentric cylinder is a semi-cylindrical eccentric structure, the center line of the elliptical eccentric cylinder is parallel to the center line of the main diameter and has a certain distance, and the plane end of the elliptical eccentric cylinder is fixed with a The valve bag is provided with a threaded through hole, and the threaded through hole is connected with the gas injection pipeline through a ferrule joint. The gas injection channel of the gas lift mandrel is the gas injection pipe, and the oil pipe production does not occupy the cavity of the oil sleeve ring, which effectively solves the limitation of the gas injection pressure and the corrosiveness of the injected gas on the gas lift technology, which is beneficial to the casing protection.

Description

Bypass lift mandrel for oil and gas field

technical field

The invention relates to a bypass gas lift working cylinder for oil and gas fields, and belongs to the technical field of gas lift oil production.

Background technique

The main supporting tool of gas lift technology is gas lift mandrel. The gas lift mandrel is equivalent to the oil pipe short joint, which is connected with the oil pipe. Its function is to install and fix the gas lift valve. It is the working carrier of the gas lift valve and provides the gas injection channel for the gas lift valve. The gas injection channel of the conventional gas lift mandrel is communicated with the oil jacket annulus, and its working principle is: the ground high-pressure gas enters the oil jacket annulus, and is injected into the oil pipe through the gas lift mandrel through the gas lift valve.

There are two problems with high pressure gas in the oil casing annulus: one is that the gas directly contacts the casing, especially the high pressure gas of corrosive medium will corrode the casing; The promotion of the gas lift gradually decreases, and the casing is collapsed, which limits the popularization and application of the gas lift technology.

With the increasingly serious global energy shortage, the difficulty of oilfield development, the small wellbore, large displacement and other wellbore structures, the number of oil and gas wells such as fluid corrosion, sand-bearing, scaling, etc. is increasing year by year, most of the lifting methods are no longer suitable for these oil wells The advantages of gas lift technology with strong adaptability are gradually highlighted.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a bypass gas lift working cylinder for oil and gas fields. The gas injection channel of the gas lift working cylinder is the gas injection pipe for gas injection. The production of the oil pipe does not occupy the cavity of the oil sleeve ring, and effectively solves the gas injection pressure. And the limitation of injected gas corrosiveness on gas lift technology is beneficial to casing protection, and it can be applied to corrosive injected gas, corrosive oil reservoirs, long-span formations and other oil and gas wells that require casing protection.

To achieve the above object, the present invention adopts the following technical solutions:

A bypass gas lift mandrel for oil and gas fields, comprising the following components:

The upper joint, the elliptical eccentric cylinder and the lower joint are connected in series in sequence, the upper joint and the lower joint are hollow cylindrical structures, and the two are located on the same main diameter centerline, and the elliptical eccentric cylinder is semi-cylindrical Eccentric structure, the center line of the elliptical eccentric cylinder is parallel to the center line of the main diameter and there is a certain distance, the flat end of the elliptical eccentric cylinder is fixed with a valve bag, the valve bag is provided with a threaded through hole, the thread The through hole is connected to the gas injection line through a ferrule fitting.

In the bypass gas lift mandrel for oil and gas fields, preferably, the valve bag includes a valve bag base and a valve bag tube arranged on the valve bag base, and the valve bag base is fixed on the plane of the elliptical eccentric cylinder The threaded through hole is arranged on the pipe wall of the valve bag pipe.

In the bypass gas lift mandrel for oil and gas fields, preferably, the center line of the valve bag of the valve bag is parallel to the center line of the main diameter, and there is a certain distance.

In the bypass gas lift mandrel for oil and gas fields, preferably, the center line of the main diameter, the center line of the elliptical eccentric cylinder and the center line of the valve bag are located on the same plane.

In the bypass lift working cylinder for oil and gas fields, preferably, a slope is provided at the connection between the elliptical eccentric cylinder and the upper joint and the lower joint as a transition connection.

In the bypass lift mandrel for oil and gas fields, preferably, the threaded through hole is perpendicular to the centerline of the main diameter.

In the bypass gas lift mandrel for oil and gas fields, preferably, the threaded through hole is an air-tight thread, and the buckle length is not less than four pitches.

In the bypass gas lift mandrel for oil and gas fields, preferably, the number of the threaded through holes is 1-7, and they are distributed on the same radial plane.

In the bypass gas lift working cylinder for oil and gas fields, preferably, a locking mechanism is provided on the valve bag for installing, locking and sealing the gas lift valve.

The present invention has the following advantages due to taking the above technical solutions:

The invention changes the traditional oil-casing annular air injection method, and introduces a new bypass gas lift working cylinder for oil and gas fields, which is equivalent to an oil pipe short section and is connected with the oil pipe. The new channel of gas lift injection gas realizes the function of gas bypass gas injection, effectively solves the limitation of gas injection pressure and corrosiveness of injected gas on gas lift technology, and is beneficial to casing protection. The tool is designed with multiple threaded through holes for connecting gas injection pipelines to form multiple groups of gas injection channels, and according to the designed gas volume requirements, one or more threaded through holes can be used for gas injection to realize gas volume adjustment.

Description of drawings

1 is an axial cross-sectional schematic diagram of a bypass gas lift mandrel for oil and gas fields provided by an embodiment of the present invention;

Fig. 2 is the A-A direction sectional view of Fig. 1;

The marks in the figure are as follows:

1-upper joint; 2-elliptical eccentric cylinder; 3-elliptical eccentric cylinder centerline; 4-valve bag; 5-valve bag centerline; 6-lower joint; 7-main diameter centerline; 8-slope; 9- Threaded through holes.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used in the present invention should have the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," "third," "fourth," and similar terms used herein do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As shown in Figure 1, the bypass gas lift mandrel for oil and gas fields provided by the present invention includes the following components:

The upper joint 1, the elliptical eccentric cylinder 2 and the lower joint 6 are connected in series in sequence. The upper joint 1 and the lower joint 6 are hollow cylindrical structures, and the two are located on the same main diameter centerline 7, and the elliptical eccentric cylinder 2 is a semi-cylindrical structure. It has an eccentric structure, the center line 3 of the elliptical eccentric cylinder is parallel to and has a certain distance from the center line 7 of the main diameter, the flat end of the elliptical eccentric cylinder 2 is fixed with a valve bag 4, and the valve bag 4 is provided with a threaded through hole 9. The hole 9 is connected to the gas injection line through a ferrule joint. The gas injection channel of the gas lift working cylinder provided by the invention is the gas injection pipe for gas injection, and the production of the oil pipe does not occupy the cavity of the oil sleeve ring, effectively solves the limitation of the gas injection pressure and the corrosiveness of the injected gas on the gas lift technology, and is beneficial to Casing protection, which can be applied to corrosive injected gas, corrosive oil reservoirs, long-span formations and other oil and gas wells that require casing protection.

The invention designs the gas lift working cylinder into an elliptical eccentric cylinder + valve bag structure. First, the function of replacing the gas lift valve by making full use of the original gas lift wire casting and fishing does not change the casting performance and size parameters of the gas lift working cylinder, and reduces the The workload of the redesign of the casting and fishing tools is reduced, and the second is to facilitate the external connection of the gas injection pipe, and to facilitate the design of the external fixed protection bypass pipe structure.

In a preferred embodiment of the present invention, the valve bag 4 includes a valve bag base and a valve bag tube disposed on the valve bag base, the valve bag base is fixed on the flat end of the elliptical eccentric cylinder 2, and the threaded through hole 9 is set in the valve bag on the wall of the tube.

In a preferred embodiment of the present invention, the valve bag centerline 5 of the valve bag 4 is parallel to the main diameter centerline 7 and has a certain distance.

In a preferred embodiment of the present invention, the center line 7 of the main diameter, the center line 3 of the elliptical eccentric cylinder and the center line 5 of the valve bag are located on the same plane.

In a preferred embodiment of the present invention, a slope 8 is provided at the connection between the elliptical eccentric cylinder 2 and the upper joint 1 and the lower joint 6 as a transitional connection. The stress concentration at the connection between the elliptical eccentric cylinder 2 and the upper joint 1 and the lower joint 6 is effectively reduced, and the bypass lift mandrel can be smoothly inserted into the well.

In a preferred embodiment of the present invention, the threaded through hole 9 is perpendicular to the main diameter centerline 7 . The threaded through hole 9 is connected to the gas injection pipe, and a new channel for high-pressure gas injection is established to prevent the high-pressure gas from contacting the casing, and to protect the casing.

In a preferred embodiment of the present invention, the threaded through hole 9 is an air-tight thread, and the buckle length is not less than four pitches.

In a preferred embodiment of the present invention, the number of threaded through holes 9 is 1-7, and they are distributed on the same radial plane.

In a preferred embodiment of the present invention, the valve bag 4 is provided with a locking mechanism for installing, locking and sealing the gas lift valve. When the gas lift valve needs to be replaced, the gas lift valve can be overhauled and replaced by wire work without replacing the pipe string.

The bypass lift working cylinder provided by the invention is manufactured by an integral forging process, with uniform force, no stress concentration, and a pressure bearing capacity of 70 MPa, which is suitable for high-pressure operation and corrosive medium environment. At the same time, the tool can be equipped with multiple sets of bypass gas injection pipes to achieve atmospheric injection.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. a bypass gas lift mandrel for oil and gas fields, is characterized in that, comprises following parts: The upper joint (1), the elliptical eccentric cylinder (2) and the lower joint (6) are connected in series in sequence, and the upper joint (1) and the lower joint (6) are hollow cylindrical structures, and the two are located in the same main joint. On the diameter center line (7), the elliptical eccentric cylinder (2) is a semi-cylindrical eccentric structure, and the elliptical eccentric cylinder center line (3) is parallel to the main diameter center line (7) and has a certain distance, The flat end of the elliptical eccentric cylinder (2) is fixed with a valve bag (4), the valve bag (4) is provided with a threaded through hole (9), and the threaded through hole (9) is connected to the injection hole through a ferrule joint. Gas line connection. 2 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein the valve bag (4) comprises a valve bag base and a valve bag pipe arranged on the valve bag base, and the valve bag The base is fixed on the flat end of the elliptical eccentric cylinder (2), and the threaded through hole (9) is arranged on the tube wall of the valve bag tube. 3. The bypass lift mandrel for oil and gas fields according to claim 1, wherein the valve bag centerline (5) of the valve bag (4) is parallel to the main diameter centerline (7), and There is a certain distance. 4. The bypass gas lift mandrel for oil and gas fields according to claim 3, characterized in that, the centerline of the main diameter (7), the centerline of the elliptical eccentric cylinder (3) and the centerline of the valve bag ( 5) are on the same plane. 5 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein the junction of the elliptical eccentric cylinder ( 2 ) and the upper joint ( 1 ) and the lower joint ( 6 ) is provided with a The ramp (8) serves as a transitional connection. 6 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein the threaded through hole ( 9 ) is perpendicular to the main diameter centerline ( 7 ). 7 . 7 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein the threaded through hole ( 9 ) is an air-tight thread, and the buckle length is not less than four pitches. 8 . 8 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein the number of the threaded through holes ( 9 ) is 1-7, and they are distributed on the same radial plane. 9 . 9 . The bypass gas lift mandrel for oil and gas fields according to claim 1 , wherein a locking mechanism is provided on the valve bag ( 4 ) for installing, locking and sealing the gas lift valve. 10 .

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