Gas inlet connector of gas lift gas production tree under pressure and using method

Abstract

The connector comprises a male head and a female head which are connected with each other, the male head comprises a male head shell, a circulation hole communicated with the female head is formed in one end of the male head shell, an ejector rod is movably connected into the male head shell, and one end of the ejector rod abuts against the circulation hole; the female head comprises a female head shell, one end of the female head shell is connected with an interface cylinder, one end of the interface cylinder is connected with a locking claw, the locking claw is connected with the male head shell, and connection between the male head and the female head is achieved; an operating rod is arranged in the female head shell, one end of the operating rod penetrates through a port opposite to the connector barrel to be connected with a rotating rod, and a third port of the female head shell is connected with a pipeline. According to the using method, the male head is connected with the flange blind plug, then the female head is connected with the male head, linear movement of the operating rod is controlled by rotating the rotating rod, and opening and reverse sealing of the flow channel are achieved. According to the invention, the gas lifting operation can be directly carried out under the condition that the flange blind plug is not dismounted, so that the operation efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield gas production, and in particular relates to a gas inlet joint for a pressurized gas lift tree. The invention also relates to a method for using the joint. Background Art

[0002] Gas wells not only bear the important responsibility of gas production, but also understand the gas layer parameters and gas well dynamics through the production data, well testing, pressure measurement, oil, gas and water sample component analysis and other information of gas wells, take appropriate measures to maintain the reasonable production of gas wells, and then realize the regulation of gas reservoir development process. Gas wells do not exist alone, but also according to the gas field development plan, according to a certain development method, divided layer system deployment development well network, solve the well network density, the relationship between the first well network and the multiple well network and the well layout method, make the well network spacing reasonable, control the use of reserves, and achieve the required production capacity.

[0003] At present, the gas lift interfaces reserved for the gas production trees of existing gas wells are all blocked with flange blind plugs. When gas lift operations are required, the valves must be closed to release the pressure first, and then the flange blind plugs must be removed. After the flange blind plugs are removed, the pipelines can be connected for gas lift operations. Currently, this operation method is very time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide a pressurized gas lift gas tree air inlet joint, which can directly carry out gas lift operation without removing the flange blind plug, thereby greatly improving the operation efficiency.

[0005] Another object of the present invention is to provide a method for using a pressurized gas lift tree air inlet connector.

[0006] The first technical solution adopted by the present invention is that the air inlet joint of the gas lift tree with pressure includes a male head and a female head connected to each other, the male head includes a male head shell, one end of the male head shell is provided with a flow hole communicating with the female head, a push rod is movably connected in the male head shell, and one end of the push rod is abutted against the flow hole;

[0007] The female connector includes a three-way female connector housing, an interface tube is connected to the inner side of one end of the female connector housing, a locking claw is connected to the end of the interface tube away from the female connector housing, and the locking claw is connected to the male connector housing to achieve the connection between the male connector and the female connector;

[0008] An operating rod is arranged in the female housing, one end of the operating rod is located in the interface barrel, and the other end passes through a port opposite to the interface barrel and is connected to a rotating rod. The third port of the female housing is connected to a pipeline.

[0009] The present invention is also characterized in that

[0010] A fixed block is arranged at one end of the ejector rod away from the flow hole, the outer side of the fixed block is fixedly connected to the inner side of the male housing, the ejector rod passes through the fixed block and is movably connected to the fixed block, and a through hole for fluid to pass through is opened on the fixed block;

[0011] A support spring is sleeved on the outer side of the push rod, one end of the support spring abuts against the front end of the push rod, and the other end abuts against the fixing block.

[0012] The male shell has conical surfaces inclined toward the flow hole at both ends relative to the flow hole, and a sealing conical surface matching the inclined surface is provided at one end of the push rod abutting the flow hole; a sealing conical surface matching the inclined surface is also provided on the end of the operating rod close to the male.

[0013] A plug is fixedly connected to one end of the operating rod close to the male head. The plug is parallel to the axial direction of the operating rod, and the length of the plug is not less than the axial length of the flow hole.

[0014] The female shell is provided with a pressing sleeve movably connected to the outer side of one end of the interface tube, and the locking claw is located in the pressing sleeve. The pressing sleeve is used to limit the radial movement of the locking claw. A return spring is also sleeved on one end of the female shell, and one end of the return spring abuts against the pressing sleeve, and the other end abuts against the female shell.

[0015] A fixing ring groove is provided on the male housing along the circumference of the male housing, and the fixing ring groove is used for clamping the male housing with the locking claw.

[0016] A sealing ring b is provided between the interface tube and the female head housing for sealing;

[0017] A sealing ring groove is formed on the inner side of one end of the interface tube away from the female housing, and a sealing ring c is arranged in the sealing ring groove. The sealing ring c is used to seal between the interface tube and the male housing.

[0018] One end of the female housing corresponding to the operating rod passing through is threadedly connected with a blocking nut, and a sealing ring a is arranged between the blocking nut and the female housing.

[0019] One end of the operating rod passing through the female housing is provided with a through hole along the radial direction of the operating rod, the rotating rod passes through the through hole, and the rotating rod and the operating rod are fixedly connected by a top screw.

[0020] The second technical solution adopted by the present invention is a method for using the pressurized gas lift gas tree inlet connector, using the above-mentioned pressurized gas lift gas tree inlet connector, and specifically implementing the method according to the following steps:

[0021] Step 1, make a hole on the flange blind plug, and connect the end of the male housing away from the flow hole to the flange blind plug;

[0022] Step 2: Press the pressing sleeve to insert the inner protrusion of the locking claw into the fixing ring groove, and loosen the pressing sleeve to fix the relative position of the locking claw and the male housing;

[0023] Step 3: When air lifting is required, rotate the rotating rod, move the operating rod toward the male head, and apply pressure to the ejector rod through the ejector head to open the flow channel;

[0024] Step 4, continue to rotate the rotating rod, the operating rod abuts against the flow hole to achieve reverse sealing.

[0025] The beneficial effects of the present invention are:

[0026] (1) The pressurized gas lift gas tree air inlet joint of the present invention is connected by fixing the male head which is kept sealed normally with the flange. When gas lift operation is needed, the female head is connected with the male head. The seal of the male head is released by the operating rod inside the female head to realize gas lift operation. The operation is convenient and there is no need to shut down the well to release the pressure. The operation can be carried out under pressure, which greatly improves the operation efficiency.

[0027] (2) The flow hole opened on the male head shell of the pressurized gas lift gas inlet joint of the present invention can meet the needs of daily sealing by the internal push rod of the male head. During the gas lift operation, if it is necessary to temporarily seal and cut off the flow, the flow hole can also be reversely sealed through the operating rod inside the female head, thereby improving the flexibility of equipment operation.

[0028] (3) The air inlet joint of the pressurized gas lift gas tree of the present invention tightly restricts the locking claw in the fixed ring groove through the compression sleeve, ensuring that the male and female heads are unlikely to be separated due to the air pressure inside the pipeline during operation, thereby improving the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the air inlet joint of the pressurized gas lift tree of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the male end of the air inlet joint of the pressurized gas lift tree of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the female head in the air inlet joint of the gas lift tree with pressure in the present invention.

[0032] In the figure, 1. top screw, 2. rotating rod, 3. sealing nut, 4. sealing ring a, 5. female head housing, 6. operating rod, 7. return spring, 8. interface tube, 9. pressing sleeve, 10. locking claw, 11. sealing ring b, 12. sealing ring c, 13. male head housing, 14. supporting spring, 15. top rod, 16. fixing block, 17. fixing ring groove, 18. top head. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] The air inlet connector of the gas lift tree with pressure of the present invention is as follows: Figure 1 As shown, it includes a male head and a female head connected to each other, and the male head and the flange blind plug are sealed and connected. When gas lift operation is required, the female head is connected to the male head to perform the gas lift operation. Since the flange blind plug itself does not have a through hole for gas to pass through, a through hole is opened on the flange blind plug before the male head is connected thereto for gas to pass through.

[0036] The male connector includes a male connector housing 13, and the male connector housing 13 is fixedly connected to the flange blind plug by sealing threads or welding. A flow hole communicating with the female connector is opened at one end of the male connector housing 13, and a push rod 15 is movably connected inside the male connector housing 13, and one end of the push rod 15 abuts against the flow hole. Figure 2 As shown, specifically, a fixing block 16 is provided at one end of the push rod 15 away from the flow hole, the outer side of the fixing block 16 is fixedly connected to the inner side of the male head shell 13, the push rod 15 passes through the fixing block 16 and is movably connected to the fixing block 16, and a through hole for fluid to pass through is opened on the fixing block 16 to ensure that the gas can pass through the fixing block 16 after the flow channel is opened, or the fixing block 16 itself is fixedly connected to the male head shell 13, and there is a gap between it and the male head shell 13 to ensure that the gas can pass through the fixing block 16.

[0037] A support spring 14 is sleeved on the outer side of the push rod 15, one end of the support spring 14 abuts against the front end of the push rod 15, and the other end abuts against the fixing block 16. The support spring 14 is used to give a pre-tightening force to the push rod 15, so that the push rod 15 fits tightly with the position of the corresponding flow hole of the male housing 13 to ensure the sealing effect, and the push rod 15 can be reset after the push rod 15 moves.

[0038] That is, when gas lift operation is not performed, the push rod 15 is tightly fitted with the male head shell 13 under the preload force of the support spring 14 to ensure the sealing effect of the male head; when gas lift operation is required, a force is applied to the push rod 15 in the direction of the fixed block 16, and the push rod 15 moves linearly relative to the fixed block 16. At this time, there is a gap between the front end of the push rod 15 and the male head shell 13, which can accommodate gas to pass through, thereby realizing gas lift operation.

[0039] like Figure 3 As shown, the female connector includes a three-way female connector housing 5, one end of which is connected to an interface tube 8, and a sealing ring b11 is provided between the interface tube 8 and the female connector housing 5. The interface tube 8 is connected to a locking claw 10 at one end away from the female connector housing 5, and the locking claw 10 is connected to a male connector housing 13. A fixing ring groove 17 is provided on the male connector housing 13 along the circumference of the male connector housing 13, and the locking claw 10 can be inserted into the fixing ring groove 17 to achieve the connection between the male connector and the female connector;

[0040] An operating rod 6 is arranged in the female housing 5, one end of the operating rod 6 is located in the interface tube 8, and the other end passes through the port opposite to the interface tube 8 and is connected to the rotating rod 2. The position where the operating rod 6 passes through the female housing 5 is threadedly connected to the female housing 5. The end of the female housing 5 corresponding to the end through which the operating rod 6 passes is threadedly connected to a blocking nut 3, and a sealing ring a4 is arranged between the blocking nut 3 and the female housing 5.

[0041] Specifically, the operating rod 6 passes through one end of the female housing 5 and a through hole is opened radially along the operating rod 6 . The rotating rod 2 passes through the through hole, and the rotating rod 2 and the operating rod 6 are fixedly connected by a top screw.

[0042] Furthermore, the third port of the female housing 5 is connected with a pipeline.

[0043] The operating rod 6 is driven to rotate by rotating the rotating rod 2. Since the operating rod 6 is threadedly connected to the female head shell 5, when the operating rod 6 rotates, the operating rod 6 will move linearly relative to the female head shell 5. When the operating rod 6 moves to an appropriate position, it will abut against the push rod 15. As the operating rod 6 moves further, the push rod 15 will also move linearly to complete the opening of the flow channel.

[0044] Example 2

[0045] On the basis of Example 1, the male housing 13 of the pressurized gas lift tree inlet joint of the present invention has conical surfaces inclined toward the flow hole at both ends relative to the flow hole, and the end of the push rod 15 abutting the flow hole is provided with a sealing conical surface matching the inclined surface.

[0046] Furthermore, a sealing conical surface matching the inclined surface is also provided on the end of the operating rod 6 close to the male head.

[0047] Through the above arrangement, when the operating rod 6 completes opening of the flow channel, when the rotating rod 2 is rotated again to drive the operating rod 6 to perform linear motion, the end surface of the operating rod 6 is tightly fitted with the male head housing 13 to complete the reverse sealing.

[0048] A plug 18 is fixedly connected to one end of the operating rod 6 near the male head. The plug 18 is parallel to the axial direction of the operating rod 6. The length of the plug 18 is not less than the axial length of the flow hole, ensuring that the operating rod 6 is not in contact with the male head housing 13 before the push rod 15 is pushed open by the plug 18.

[0049] Example 3

[0050] In order to improve the stability of the connection between the locking claw 10 and the male shell 13, the female shell 5 is provided with a pressing sleeve 9 which is movably connected to the outer side of one end of the interface tube 8. The locking claw 10 is located in the pressing sleeve 9. The pressing sleeve 9 is used to limit the radial movement of the locking claw 10. A return spring 7 is also sleeved on one end of the female shell 5. One end of the return spring 7 abuts against the pressing sleeve 9, and the other end abuts against the female shell 5.

[0051] That is, when the male and female heads need to be connected, the pressing sleeve 9 is pulled to radially expand the locking claw 10, and then the protrusion inside the locking claw 10 is engaged with the fixed ring groove 17 on the male head shell 13, and the pressing sleeve 9 is released. Under the action of the return spring 7, the pressing sleeve 9 applies axial pressure to the locking claw 10, so that the locking claw 10 fits tightly with the male head shell 13, and the locking claw 10 is limited in the radial direction, thereby ensuring the stability of the connection.

[0052] A sealing ring groove is opened on the inner side of one end of the interface tube 8 away from the female shell 5, and a sealing ring c12 is arranged in the sealing ring groove. When the locking claw 10 is connected to the male shell 13, the front end of the male shell 13 is inserted into the interface tube 8, and the sealing ring c12 is used to seal between the interface tube 8 and the male shell 13.

[0053] Example 4

[0054] The method for using the pressurized gas lift tree air inlet connector adopts the above-mentioned pressurized gas lift tree air inlet connector and is specifically implemented in the following steps:

[0055] Step 1, drilling a hole on the flange blind plug, using an existing common drilling tool, and drilling the flange blind plug before installing the flange blind plug on the gas tree, and then connecting the end of the male housing 13 away from the flow hole to the flange blind plug, which can be fixedly connected by sealing threads or welding;

[0056] Step 2, press the pressing sleeve 9 to insert the inner protrusion of the locking claw 10 into the fixing ring groove 17, and loosen the pressing sleeve 9 to fix the relative position of the locking claw 10 and the male head housing 13;

[0057] Step 3, when air lifting operation is required, the rotating rod 2 is rotated, the operating rod 6 is linearly moved toward the male head, and pressure is applied to the ejector rod 15 through the ejector head 18, and the ejector rod 15 is linearly moved synchronously with the operating rod 6 to complete the flow channel opening;

[0058] Step 4: When the air lift flow channel needs to be temporarily closed, continue to rotate the rotating rod 2 until the front end of the operating rod 6 is tightly fitted with the flow hole to achieve reverse sealing.

[0059] After the gas lift operation is completed, the rotating rod 2 is rotated in the opposite direction to retract the operating rod 6. The push rod 15 is reset under the action of the supporting spring 14 to fit tightly with the male head housing 13; the pressing sleeve 9 is pulled again to remove the female head.

Claims

1. The air inlet connector of the gas lift tree with pressure is characterized by: It comprises a male head and a female head connected to each other, the male head comprises a male head shell (13), one end of the male head shell (13) is provided with a flow hole communicating with the female head, a push rod (15) is movably connected inside the male head shell (13), and one end of the push rod (15) abuts against the flow hole; The female connector comprises a three-way female connector shell (5), one end of the female connector shell (5) is connected to an interface tube (8) on the inner side, the end of the interface tube (8) away from the female connector shell (5) is connected to a locking claw (10), and the locking claw (10) is connected to the male connector shell (13) to achieve the connection between the male connector and the female connector; An operating rod (6) is arranged inside the female housing (5), one end of the operating rod (6) is located inside the interface tube (8), and the other end passes through a port opposite to the interface tube (8) and is connected to a rotating rod (2), and a third port of the female housing (5) is connected to a pipeline.

2. The pressurized gas lift tree air inlet connector according to claim 1, characterized in that: A fixing block (16) is provided at one end of the push rod (15) away from the flow hole, the outer side of the fixing block (16) is fixedly connected to the inner side of the male housing (13), the push rod (15) passes through the fixing block (16) and is movably connected to the fixing block (16), and a through hole for fluid to pass through is opened on the fixing block (16); A support spring (14) is sleeved on the outer side of the push rod (15); one end of the support spring (14) abuts against the front end of the push rod (15), and the other end abuts against the fixing block (16).

3. The pressurized gas lift tree air inlet connector according to claim 2, characterized in that: The male head shell (13) has conical surfaces inclined toward the flow hole at both ends relative to the flow hole, and the end of the push rod (15) that abuts the flow hole is provided with a sealing conical surface that matches the inclined surface; the end of the operating rod (6) close to the male head is also provided with a sealing conical surface that matches the inclined surface.

4. The pressurized gas lift tree air inlet connector according to claim 1, characterized in that: The operating rod (6) is fixedly connected to one end close to the male head with a plug (18), the plug (18) is parallel to the axial direction of the operating rod (6), and the length of the plug (18) is not less than the axial length of the flow hole.

5. The pressurized gas lift tree air inlet connector according to any one of claims 1 to 4, characterized in that: The outer side of one end of the interface tube (8) of the female housing (5) is movably connected with a pressing sleeve (9), and the locking claw (10) is located in the pressing sleeve (9). The pressing sleeve (9) is used to limit the radial movement of the locking claw (10). One end of the female housing (5) is also sleeved with a return spring (7), one end of the return spring (7) is in contact with the pressing sleeve (9), and the other end is in contact with the female housing (5).

6. The pressurized gas lift tree air inlet connector according to claim 5, characterized in that: A fixing annular groove (17) is formed on the male housing (13) along the circumference of the male housing (13), and the fixing annular groove (17) is used for clamping the male housing (13) and the locking claw (10).

7. The pressurized gas lift tree air inlet connector according to any one of claims 1 to 4, characterized in that: A sealing ring b (11) is provided between the interface tube (8) and the female head housing (5) for sealing; A sealing ring groove is formed on the inner side of one end of the interface tube (8) away from the female housing (5), and a sealing ring c (12) is arranged in the sealing ring groove. The sealing ring c (12) is used to seal between the interface tube (8) and the male housing (13).

8. The pressurized gas lift tree air inlet connector according to claim 7, characterized in that: One end of the female housing (5) corresponding to the operating rod (6) is threadedly connected to a blocking nut (3), and a sealing ring a (4) is provided between the blocking nut (3) and the female housing (5).

9. The pressurized gas lift tree air inlet connector according to claim 8, characterized in that: The operating rod (6) passes through one end of the female housing (5) and has a through hole radially formed along the operating rod (6); the rotating rod (2) passes through the through hole, and the rotating rod (2) and the operating rod (6) are fixedly connected by a top screw.

10. The method for using the air inlet joint of the gas lift tree with pressure is characterized in that: The pressurized gas lift tree air inlet connector as claimed in claim 9 is implemented in the following steps: Step 1, drilling a hole on the flange blind plug, and connecting the end of the male housing (13) away from the flow hole to the flange blind plug; Step 2, pressing the pressing sleeve (9), inserting the inner protrusion of the locking claw (10) into the fixing ring groove (17), loosening the pressing sleeve (9) to fix the relative position of the locking claw (10) and the male housing (13); Step 3, when air lifting is required, the rotating rod (2) is rotated, the operating rod (6) is moved toward the male head, and pressure is applied to the ejector rod (15) through the ejector head (18) to complete the flow channel opening; Step 4, continue to rotate the rotating rod (2), the operating rod (6) abuts against the flow hole, and reverse sealing is achieved.

Images