CN114293943A - Pressure-bearing sealing device for pumping well - Google Patents

Abstract

The invention discloses a pressure-bearing sealing device for an oil pumping well. One end of the joint is connected by a thread seal; the other end of the casing is connected by a thread seal; the other end of the casing is connected by a thread seal; The other end of the double-male short-circuit is sealed with the second vent valve through threads; the sealing assembly includes: a sealing flange, a tubing hanger, a first vent valve, a first pressure gauge and a first shut-off valve, and the tee joint is also A second cut-off valve is provided; a second pressure gauge is connected to the second cut-off valve. The connection reliability of each connection of the pressure-bearing sealing device of the present invention is high, and at the same time, the pressure change of the oil pipe during water injection in the oil production well can be checked through the first pressure gauge, which improves the safety and sealing performance.

Description

A pressure-bearing sealing device for an oil well

technical field

The invention belongs to the technical field of simple wellhead equipment for oil production wells, in particular to a pressure-bearing sealing device for oil wells.

Background technique

At present, almost all of the shallow oil production wells use simple wellheads with simple structures. At the oil production site, multiple simple oil wells (called satellite wells) are usually opened within a certain range for oil production. Oilfield water injection is one of the important means to supplement energy to the formation and improve oilfield recovery in the process of oilfield development. In the process of oilfield development, water is injected into the oil reservoir through a special water injection well to maintain or restore the reservoir pressure stored in the oil reservoir.

In the well site of satellite wells, the water injection well is usually set near the center of the range enclosed by all the satellite wells, and the water injection well performs water injection in the same layer for the satellite wells that need water injection. Before water injection, the wellhead of the satellite well that needs water injection needs to be sealed, and the mining can be continued after the water injection is completed. Satellite wells can be divided into artesian and pumping types. Artesian wells do not need oil pumping equipment during oil production, and oil pumping wells require oil pumping equipment for oil production. In the prior art, the sealing device used to seal the wellhead of the oil-pumping satellite well adopts a welded assembly structure. Although the structure is simple and the cost is low, the sealing performance and safety and reliability are poor, and it is impossible to seal the wellhead. The pressure in the wellhead is observed.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a pressure-bearing sealing device for an oil well. The technical problem to be solved by the present invention is realized by the following technical solutions:

A pressure-bearing sealing device for an oil pumping well, comprising: a tee joint, a second vent valve, a second double-male short-circuit, a casing short-circuit and a sealing assembly;

The first interface of the tee joint is connected with the shorted end of the casing through a thread seal; the other end of the casing shorted is connected with the casing of the wellhead of the oil production well through a thread seal;

The second interface of the three-way joint is connected with one end of the second double-male short-circuit through a thread seal; the other end of the second double-male short-circuit is connected with the second vent valve through a thread seal;

The sealing assembly includes: a sealing flange, a tubing hanger, a first vent valve, a first pressure gauge and a first shut-off valve;

the sealing flange is detachably connected to the third interface of the tee joint and is sealedly connected;

One end of the tubing hanger is located in the casing short connection, and the other end passes through the sealing flange and is sealedly connected to the first vent valve through the first double male short connection;

the first shut-off valve is arranged on the first double-male short-circuit;

a first pressure gauge, connected to the first shut-off valve;

A second shut-off valve is arranged on the three-way joint; and a second pressure gauge is connected to the second shut-off valve.

In an embodiment of the present invention, a metal sealing gasket ring is provided on the axial side wall of the connection between the sealing flange and the third interface of the three-way joint.

In an embodiment of the present invention, an annular boss is provided on the outer wall of the tubing hanger;

The inner wall of the sealing flange is provided with a groove for accommodating the annular boss.

In an embodiment of the present invention, the annular boss is provided with at least one annular accommodating groove;

A sealing ring is arranged in the annular accommodating groove.

In an embodiment of the present invention, the annular accommodating groove is a dovetail groove structure.

In an embodiment of the present invention, at least one limit bolt is fixed on the tubing hanger located at the upper end of the sealing flange;

The screw rod of the limit bolt is perpendicular to the axial direction of the tubing hanger, and the limit bolt is located at a position close to the sealing flange.

In an embodiment of the present invention, a knocking portion is provided on the outer wall of the three-way joint.

In an embodiment of the present invention, the first vent valve and the second vent valve are both manual flat valve or manual wedge valve or ball valve.

Beneficial effects of the present invention:

The pressure-bearing sealing device of the invention can seal and block the simple oil production well when the water injection well performs water injection on the same layer of the simple oil production well, the tee joint is connected with the second double male shorting thread and is sealedly connected, and the tee joint and the seal The flanges are detachably connected and sealed, and the connection reliability of each connection is high. Moreover, the second vent valve is installed on the second double-male short-circuit connection, which can facilitate the venting operation and improve the safety and sealing. At the same time, the pressure changes in the tubing and the casing annulus of each simple oil production well can be checked through the first pressure gauge and the second pressure gauge. In case of unexpected safety accidents, the convenience and safety are further improved.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Description of drawings

1 is a schematic structural diagram of a pressure-bearing sealing device for an oil pumping well provided by an embodiment of the present invention;

Fig. 2 is the B-B direction view of Fig. 1;

3 is a cross-sectional view of a tubing hanger provided by an embodiment of the present invention;

4 is a cross-sectional view of a sealing flange provided by an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of part A of FIG. 3 .

Description of reference numbers:

10-Tee joint; 11-Second globe valve; 12-Second pressure gauge; 20-Second vent valve; 30-Second double male shorting; 40-Sleeve shorting; 50-Sealing flange; 501 - groove; 51 - tubing hanger; 511 - annular boss; 512 - annular receiving groove; 513 - sealing ring; 52 - first vent valve; 53 - first pressure gauge; 54 - first stop valve; 55 - The first double male short-circuit; 56-metal sealing ring; 57-limiting bolt; 60-percussion part.

Detailed ways

The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

Example 1

Referring to FIG. 1 , a pressure-bearing sealing device for an oil pumping well includes: a tee joint 10 , a second vent valve 20 , a second double male short connection 30 , a casing short connection 40 and a sealing assembly. The first interface of the tee joint 10 is connected to one end of the casing short connection 40 through thread sealing; the other end of the casing short connection 40 is connected to the casing of the wellhead of the oil production well through thread sealing. The second interface of the tee joint 10 is connected to one end of the second double male short connection 30 through a thread sealing connection; the other end of the second double male short connection 30 is connected to the second vent valve 20 through a thread sealing connection. The sleeve short 40 communicates with the second interface of the tee joint 10 .

In this embodiment, the second vent valve 20 is used to perform a venting operation when the oil production well needs to be vented. The venting operation can be performed by opening the second venting valve 20. After the operation is completed, the second venting valve 20 can be closed. Pull out the plug to perform the venting operation, and the venting operation is more convenient. At the same time, the second venting valve 20 is threadedly connected with the second double-male short-circuit 30 through the thread, and the second double-male short-circuit 30 is sealed with the tee joint 10 through the thread. Compared with the welding connection method, the sealing device of this embodiment has better sealing performance.

The sealing assembly includes: a sealing flange 50 , a tubing hanger 51 , a first vent valve 52 , a first pressure gauge 53 and a first shut-off valve 54 . The sealing flange 50 is detachably connected with the third interface of the three-way joint 10 and is connected in a sealed manner. One end of the tubing hanger 51 is located in the casing short connection 40 , and the other end of the tubing hanger 51 passes through the sealing flange 50 and is sealedly connected to the first vent valve 52 through the first double male short connection 55 . One end of the first double male nipple is connected to the other end of the tubing hanger 51 through a thread seal, and the other end of the first double male nipple is detachably connected to the first vent valve 52 through a thread seal. The first shut-off valve 54 is arranged on the first double male short-circuit 55 . The first pressure gauge 53 is connected to the first shut-off valve 54 . The sealing flange 50 is detachably connected to the tee joint 10, and the first vent valve 52 is detachably connected to the first double male short connection 55, which is convenient for disassembly, installation and maintenance. The sealing performance, safety and reliability of the sealing device are improved.

In this embodiment, when water flooding is required for oil production, the water injection wells perform water injection in the same layer in the same stratum of all oil production wells that require water injection. (Satellite well) wellhead pumping unit is disassembled, the connected tee joint 10 and casing short 40 are connected to the casing, then the lower end of the tubing hanger 51 is connected to the tubing, and the sealing flange 50 is connected to the tee joint 10 connections. The first vent valve 52 is closed, the second vent valve 20 is closed, and then the water injection operation is started. During water injection, the sealing device can prevent the liquid in the simple production well from flowing out of the oil production well and causing environmental pollution.

Further, as shown in FIG. 2 , the tee joint 10 is provided with a second stop valve 11 . A second pressure gauge 12 is connected to the second shut-off valve 11 . In this embodiment, the second stop valve 11 is connected to the casing short 40. During the water injection process in the same layer, the pressure of the oil casing annulus in the oil well can be monitored by observing the second pressure gauge 12. When the pressure values of the first pressure gauge 53 and the second pressure gauge 12 are close to 0, it means that the pressure in the oil production well is relatively small, and because the pressure in the same layer of the oil production well is balanced, it indicates that all oil production wells can continue the oil production operation. By observing the second pressure gauge 12, the water injection situation of the oil production well can be judged, which further facilitates the subsequent oil production operation, and further improves the convenience of the simple oil production well operation.

The first shut-off valve 54 and the second shut-off valve 11 are both self-contained pressure relief shut-off valves. The second shut-off valve 11 can protect the second pressure gauge 12 to avoid accidental damage to the second pressure gauge 12 when the pressure is high. If the second pressure gauge 12 needs to be replaced, the second shut-off valve 11 is closed, the pressure relief screw provided with the second shut-off valve 11 is loosened, and the second pressure gauge 12 can be replaced.

In the process of water injection in the same layer, the pressure changes in the tubing and the annulus of the tubing and casing of each simple oil production well can be checked by observing the first pressure gauge 53 and the second pressure gauge 12 at the same time. Take relevant measures in a timely manner to avoid unexpected safety accidents and further improve safety. At the same time, in the process of water injection in the same layer, when the pressure values of the first pressure gauge 53 and the second pressure gauge 12 of all the oil production wells are close to 0, it means that the pressure in the oil production well is small. It shows that all the oil production wells can continue the oil production operation. At this time, open the first vent valve 52 and the second vent valve 20 for venting operation, then remove the sealing flange 50 and the tubing hanger 51, and short the casing 40 and The casing is removed, and the wellhead pumping device is installed to continue the oil production operation. By observing the first pressure gauge 53 and the second pressure gauge 12, the water injection condition of the oil production well can be judged, so as to facilitate the subsequent oil production operation, and improve the safety and convenience of the water injection operation of the simple oil production well.

Wherein, when the sealing device of this embodiment is in use, the sealing flange 50 , the tubing hanger 51 , and the first vent valve 52 can be assembled and disassembled with the tee joint 10 as a whole. The bushing short 40 and the tee fitting 10 can be installed and removed as a whole with the bushing.

In addition, the first shut-off valve 54 can protect the first pressure gauge 53 to avoid accidental damage of the first pressure gauge 53 under the condition of high pressure. If the first pressure gauge 53 needs to be replaced, the first shut-off valve 54 is closed, the pressure relief screw provided with the first shut-off valve 54 is loosened, and the first pressure gauge 53 can be replaced.

Wherein, the thread of the lower end of the casing short connection 40 is a taper thread that matches the taper thread of the casing, the thread of the second double male short connection 30 is the thread of the second interface of the tee joint 10 and the thread of the second vent valve 20 Matching and all are tubing taper thread structure.

Among them, the thread of the first double male short connection 55 is matched with the thread of the tubing hanger 51 and the thread of the first vent valve 52 and both are of tubing taper thread structure. The first double male short connection 55 is connected to the first stop valve 54 The connected threads are matched with the threads of the first shut-off valve 54 and are all tapered threads.

In a feasible implementation manner, a set screw is further provided on the side wall of the first interface of the tee joint 10 , and the set screw is used to further tighten the casing short connection 40 .

Further, as shown in FIG. 1 , a metal gasket ring 56 is provided on the axial side wall of the connection between the sealing flange 50 and the third interface of the tee joint 10 . The metal gasket ring 56 is in contact with the axial side wall near the point of contact between the sealing flange 50 and the third interface.

Further, as shown in FIGS. 3 and 4 , the outer wall of the tubing hanger 51 has an annular boss 511 . The inner wall of the sealing flange 50 is provided with a groove 501 for accommodating the annular boss 511 . In this embodiment, the annular boss 511 is clamped in the groove 501, so that the sealing flange 50 and the tubing hanger 51 can be snapped together. At the same time, when the sealing device is used, the groove 501 can be used for the annular boss 511. The limit can make the tubing hanger 51 and the sealing flange 50 form a more reliable limit.

Further, as shown in FIG. 5 , the annular boss 511 is provided with at least one annular accommodating groove 512 . A sealing ring 513 is arranged in the annular accommodating groove 512 . The sealing ring 513 seals between the sealing flange 50 and the tubing hanger 51 .

Preferably, the number of annular accommodating grooves 512 is two, and the number of sealing rings 513 is two.

Further, as shown in FIG. 5 , the annular accommodating groove 512 is a dovetail groove structure. In this embodiment, the annular accommodating groove 512 of the dovetail groove structure can form a certain buffering effect on the sealing ring 513 , the space of the dovetail groove gradually increases from the notch to the groove bottom, and the sealing ring 513 is compressed to the annular accommodating groove 512 by force. In the middle, due to the large space in the middle, the sealing ring 513 can have a certain expansion and contraction space, so as to prevent the sealing ring 513 from being worn by the groove wall and prolong the service life.

Further, as shown in FIG. 1 , at least one limit bolt 57 is fixed on the tubing hanger 51 located at the upper end of the sealing flange 50 . The screw rod of the limit bolt 57 is perpendicular to the axial direction of the tubing hanger 51 , and the limit bolt 57 is located near the sealing flange 50 . In this embodiment, the sealing flange 50 is sleeved on the tubing hanger 51, and the limit bolt 57 is used to limit the axial position of the sealing flange 50 to prevent the sealing flange 50 from approaching the first The direction of the vent valve 52 is shifted, therefore, damage caused by the collision of the sealing flange 50 with other components is avoided. At the same time, the wear of the sealing ring 513 caused by the movement of the sealing flange 50 can be avoided.

Preferably, the number of limit bolts 57 is two, and the two limit bolts 57 are symmetrically arranged.

Further, the first vent valve 52 and the second vent valve 20 are both manual flat valve or manual wedge valve or ball valve.

Further, as shown in FIG. 1 , a knocking portion 60 is provided on the outer wall of the tee joint 10 . The knocking portion 60 protrudes outward relative to the outer wall of the tee joint 10. When the sealing device is installed on the casing, the knocking portion 60 acts as a force application point for rotating the sealing device, which is convenient for short-circuiting the thread of the casing 40 and the casing. The threads of the casing are screwed together to improve ease of installation of the seal.

Wherein, the knocking part 60 can be fixed on the tee joint 10 by screwing, welding or riveting, and preferably, the knocking part 60 is reliably connected to the tee joint 10 through a screw thread.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. 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 present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (8)

1. The utility model provides a pumping well pressure-bearing sealing device which characterized in that includes: the three-way joint (10), the second emptying valve (20), the second double-male short circuit (30), the casing short circuit (40) and the sealing assembly;

the first interface of the three-way joint (10) is hermetically connected with one end of the casing short joint (40) through threads; the other end of the casing short joint (40) is hermetically connected with a casing of a wellhead of the oil production well through threads;

the second interface of the three-way joint (10) is connected with one end of the second double-male short circuit (30) in a sealing way through threads; the other end of the second double male short circuit (30) is in sealing connection with the second emptying valve (20) through threads;

the seal assembly, comprising: the device comprises a sealing flange (50), an oil pipe hanger (51), a first emptying valve (52), a first pressure gauge (53) and a first stop valve (54);

the sealing flange (50) is detachably connected and hermetically connected with a third interface of the three-way joint (10);

the oil pipe hanger (51) has one end positioned in the casing short circuit (40) and the other end passing through the sealing flange (50) and being in sealing connection with the first emptying valve (52) through a first double-male short circuit (55);

the first stop valve (54) is arranged on the first double-male short circuit (55);

the first pressure gauge (53) is connected with the first stop valve (54);

the three-way joint (10) is also provided with a second stop valve (11); and a second pressure gauge (12) is connected to the second stop valve (11).

2. A well pressure-bearing sealing device according to claim 1, characterized in that a metal gasket ring (56) is arranged on the axial side wall of the junction of the sealing flange (50) and the third port of the three-way joint (10).

3. A well pressurized sealing device according to claim 2, characterized in that said tubing hanger (51) has an annular boss (511) on its outer wall;

and a groove (501) for accommodating the annular boss (511) is formed in the inner wall of the sealing flange (50).

4. A well-pressurized sealing device according to claim 3, wherein said annular boss (511) is provided with at least one annular receiving groove (512);

and a sealing ring (513) is arranged in the annular accommodating groove (512).

5. A well bore pressure-containing sealing arrangement as claimed in claim 4, wherein said annular receiving groove (512) is of dovetail groove configuration.

6. A pressure-bearing sealing device for a pumping well according to claim 1, characterized in that at least one limit bolt (57) is fixedly arranged on the tubing hanger (51) at the upper end of the sealing flange (50);

the screw rod of the limiting bolt (57) is perpendicular to the axial direction of the oil pipe hanger (51), and the limiting bolt (57) is located at a position close to the sealing flange (50).

7. A well pressure-bearing sealing device according to claim 1, characterized in that the outer wall of the three-way joint (10) is provided with a knocking portion (60).

8. A well pressure-bearing sealing device according to claim 1, characterized in that said first drain valve (52) and said second drain valve (20) are both manual flat valves or manual wedge valves or ball valves.

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