Rotary control head service system and method for unseating a closure pressure and compensating for a balance pressure

Abstract

The application discloses a circle-closed pressure unloading and balance pressure compensating rotary control head technical service system and method, belongs to the technical field of the rotary control head technical service system, and comprises a hydraulic control system, an RCD shell, an RCD assembly, a hydraulic flat valve, a Y-shaped joint, a hydraulic pressure relief valve, a hydraulic grouting valve, a wellhead pressure sensor and a grouting pipeline interface. The annular blowout preventer is fixedly installed with the RCD shell at the upper portion. The RCD shell is fixedly installed with the RCD assembly at the upper portion. The right end of the RCD shell is fixedly installed with the hydraulic flat valve. The left end of the RCD shell is fixedly connected with the Y-shaped joint for shell connection. The Y-shaped joint for shell connection is fixedly installed with a Y-shaped manual ball valve. The outlet of the Y-shaped manual ball valve is fixedly installed with the Y-shaped joint. Through the above manner, the application can be applied to the circle-closed pressure unloading of the drilling operation with the rotary control head technical service in the narrow pressure window, the high-sulfur pressure operation and the possible drilling of the high-pressure brine layer.

Description

Technical Field

[0001] This invention relates to the field of rotary control head technology service system technology, specifically to a rotary control head technology service system and method for unloading lock-up pressure and compensating for balance pressure. Background Technology

[0002] In oil drilling engineering, to overcome the technical challenge of narrow mud density windows when encountering abnormal formation pressure, the research and application of RCD equipment and related technologies for land-based controlled pressure drilling have made significant progress since 2008, and have been continuously promoted and applied in oilfields such as Xinjiang, Sichuan, Changqing, and Liaohe. However, with the drilling and development of deeper and ultra-deep oil and gas reservoirs in various oilfields, the existing conventional rotary control head technology for pressurized operations faces new operational risks, well control equipment safety concerns, and new challenges.

[0003] In order to reduce operational risks and prevent damage to the rubber core of the annular blowout preventer (BOP) during pressurized opening of the RCD (Rotating Control Head) for drilling and development of deep and ultra-deep oil and gas reservoirs, it is necessary to develop and add a set of equipment and methods to the existing RCD technology service process and equipment. This equipment and methods can remotely release the trap pressure and compensate for the balance pressure between the annular BOP and the RCD assembly, thereby enabling safe and effective implementation of rotary control head technology service work.

[0004] Based on this, the present invention designs a rotary control head technology service system and method for unloading the closing pressure and compensating for the balancing pressure to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a rotary control head technology service system and method for unloading the closing pressure and compensating for the balance pressure.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rotary control head technical service system for relieving closing pressure and compensating for balancing pressure includes a hydraulic control system, an RCD housing, an RCD assembly, a hydraulic flat valve, a union four-way valve, a hydraulic pressure relief valve, a hydraulic grouting valve, a wellhead pressure sensor, and a grouting pipeline interface.

[0008] An RCD housing is fixedly installed on the upper part of the annular blowout preventer; an RCD assembly is fixedly installed on the upper part of the RCD housing; a hydraulic flat valve is fixedly installed on the right end of the RCD housing; a union connector for housing connection is fixedly connected to the left end of the RCD housing, and a union manual ball valve is fixedly installed at the union connector; a union four-way valve is fixedly installed at the outlet of the union manual ball valve, with a hydraulic grouting valve installed at one end of the union four-way valve and connected to the grouting pipeline interface, a hydraulic pressure relief valve installed at one end and connected to the pressure relief manifold, and the other end connected to the wellhead pressure sensor; the pressure relief manifold extends to the ground and connects to the choke manifold.

[0009] Furthermore, the clamp control line of the hydraulic control system is connected to the clamp cylinder of the RCD housing for remotely opening and closing the clamps of the RCD housing; the lubricating oil line of the hydraulic pump station is connected to the lubricating oil connection port of the RCD assembly for remotely controlling the oil injection and lubrication of the RCD assembly.

[0010] Furthermore, the cooling water pipeline of the hydraulic pump station is connected to the cooling water connection port of the RCD assembly for remote cooling of the bearings of the RCD assembly; the hydraulic valve control pipeline of the hydraulic control system is connected to the hydraulic flat valve for remote opening and closing of the hydraulic flat valve.

[0011] Furthermore, the hydraulic control system's hydraulic grouting valve control line is connected to the hydraulic grouting valve for remotely opening and closing the hydraulic grouting valve; the hydraulic control system's hydraulic pressure relief valve control line is connected to the hydraulic pressure relief valve for remotely opening and closing the hydraulic pressure relief valve.

[0012] Furthermore, the hydraulic pressure relief valve is fixedly connected to the upper end of the union elbow, the lower end of the union elbow is fixedly connected to the left end of the union pipeline, and the right end of the union pipeline is fixedly connected to the throttling manifold via a union interface through a manifold connection.

[0013] Furthermore, the right end of the hydraulic flat valve is fixedly connected to the slurry outlet; the lower part of the annular blowout preventer is fixedly connected to the double gate blowout preventer, the lower part of the double gate blowout preventer is fixedly connected to the first single gate blowout preventer, the lower part of the first single gate blowout preventer is fixedly connected to the second single gate blowout preventer, and the lower part of the second single gate blowout preventer is fixedly connected to the upper end of the drilling cross-connector.

[0014] Furthermore, the hydraulic pressure relief valve is a 35MPa hydraulic pressure relief valve; the hydraulic grouting valve is a 35MPa hydraulic grouting valve; and the grouting pipeline interface is a 35MPa grouting pipeline interface.

[0015] A drilling method for a rotary control head technology service system for relieving trap pressure and compensating for balancing pressure includes the following steps:

[0016] Step 1: Close the annular blowout preventer;

[0017] Step 2: Open the hydraulic pressure relief valve and remotely adjust the throttle valve opening of the throttle manifold to orderly release the closed pressure between the upper part of the annular blowout preventer and the RCD assembly to 0 MPa.

[0018] The released trapped liquid or gas passes through a liquid-gas separator for liquid-gas separation. The liquid returns to the buffer tank, and the gas is ignited and burned in the combustion chamber.

[0019] Step 3: Install the new RCD assembly and remotely close the clamps on the RCD housing;

[0020] Step 4: Close the choke valve of the choke manifold, remotely open the drilling four-way valve and the hydraulic flat valve, and connect the pressure inside the wellbore with the space between the upper part of the annular blowout preventer and the RCD assembly, so that the pressure between the lower part of the annular blowout preventer and the upper part of the annular blowout preventer and the RCD assembly is balanced.

[0021] Step 5: Activate the annular blowout preventer (BOP) and resume normal pressurized drilling operations. Activating the annular BOP when the pressure above and below is balanced effectively avoids or reduces damage to the BOP core caused by the water-based effect due to pressure difference, providing convenient conditions for the continuity of subsequent drilling operations and effectively shutting in the well to avoid well control accidents.

[0022] Beneficial effects

[0023] This invention adds a 35MPa hydraulic pressure relief valve and a 35MPa pressure relief manifold connected to a throttling manifold, allowing for remote, safe, and orderly pressure relief between the annular blowout preventer and the RCD assembly through the throttling valve of the throttling manifold.

[0024] This invention adds a 35MPa hydraulic pressure relief valve and connects the pressure relief manifold to the choke manifold. By remotely opening this manifold, drilling four-way valve, and hydraulic flat valve, the pressure inside the wellbore is compensated to the area between the annular blowout preventer (BOP) and the RCD assembly, thus balancing the pressure between the lower part of the annular BOP and the upper part of the annular BOP and the RCD assembly. When the pressure above and below the annular BOP is balanced, the BOP is opened, effectively avoiding or reducing the damage to the annular BOP rubber core caused by the water-based effect due to the pressure difference. This provides convenient conditions for the continuity of subsequent drilling work and can effectively shut in the well to avoid well control accidents.

[0025] This invention is applicable to drilling operations with narrow pressure windows, high sulfur content requiring pressurized operation, and those that may encounter high-pressure brine layers and require rotary control head technology to relieve trap pressure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a rotary control head technology service system for unloading closing pressure and compensating for balancing pressure according to the present invention.

[0028] The labels in the diagram represent:

[0029] 1. Hydraulic control system 2. RCD housing 3. RCD assembly 4. Hydraulic flat valve 5. Union port for housing connection 6. Union manual ball valve 7. Union four-way valve 8. Hydraulic pressure relief valve 9. Hydraulic grouting valve 10. Wellhead pressure sensor 11. Grouting pipeline interface 12. Union elbow 13. Union pipeline 14. Union port for manifold connection 15. Grout outlet interface 16. Annular blowout preventer 17. Double gate blowout preventer 18. First single gate blowout preventer 19. Second single gate blowout preventer 20. Drilling four-way valve 21. Choke manifold. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] Example 1

[0033] Please refer to the instruction manual appendix. Figure 1 A rotary control head technology service system for unloading closed pressure and compensating for balanced pressure includes a hydraulic control system 1, an RCD housing 2, an RCD assembly 3, a hydraulic flat valve 4, a union four-way valve 7, a hydraulic pressure relief valve 8, a hydraulic grouting valve 9, a wellhead pressure sensor 10, and a grouting pipeline interface 11.

[0034] The annular blowout preventer 16 has an RCD housing 2 fixedly installed on its upper part;

[0035] RCD assembly 3 is fixedly installed on the upper part of RCD housing 2, which is used to seal the annular space of the wellhead when pressurized operation is required;

[0036] A hydraulic plate valve 4 is fixedly installed on the right end of the RCD housing 2, and the hydraulic plate valve 4 is connected to the elevated tank.

[0037] The left end of the RCD housing 2 is fixedly connected to a union interface 5 for housing connection. A union manual ball valve 6 is fixedly installed at the union interface 5 for housing connection. A union four-way valve 7 is fixedly installed at the outlet of the union manual ball valve 6. A hydraulic grouting valve 9 is installed at one end of the union four-way valve 7 and connected to the grouting pipeline interface 11. A hydraulic pressure relief valve 8 is installed at one end and connected to the pressure relief manifold. The other end is connected to the wellhead pressure sensor 10.

[0038] The pressure relief manifold extends to the ground and connects to the throttling manifold 21;

[0039] The clamp control line of the hydraulic control system 1 is connected to the hydraulic cylinder of the clamp of the RCD housing 2, and is used to remotely open and close the clamp of the RCD housing 2.

[0040] The hydraulic pump station's lubricating oil pipeline is connected to the lubricating oil connection port of the RCD assembly 3 for remote control of the RCD assembly 3's oil injection and lubrication.

[0041] The cooling water pipeline of the hydraulic pump station is connected to the cooling water connection port of the RCD assembly 3 for remote cooling and cooling of the bearings of the RCD assembly 3;

[0042] The hydraulic control system 1 has a hydraulic valve control line connected to the hydraulic plate valve 4 for remote opening and closing of the hydraulic plate valve 4.

[0043] The hydraulic control system 1 has a hydraulic grouting valve control line connected to the hydraulic grouting valve 9 for remote opening and closing of the hydraulic grouting valve 9;

[0044] The hydraulic control system 1 has a hydraulic pressure relief valve control line connected to the hydraulic pressure relief valve 8 for remotely opening and closing the hydraulic pressure relief valve 8;

[0045] The hydraulic pressure relief valve 8 is fixedly connected to the upper end of the union elbow 12, the lower end of the union elbow 12 is fixedly connected to the left end of the union line 13, and the right end of the union line 13 is fixedly connected to the throttling manifold 21 through the union interface 14.

[0046] The right end of the hydraulic flat plate valve 4 is fixedly connected to the slurry outlet 15;

[0047] The lower part of the annular blowout preventer 16 is fixedly connected to the double gate blowout preventer 17, the lower part of the double gate blowout preventer 17 is fixedly connected to the first single gate blowout preventer 18, the lower part of the first single gate blowout preventer 18 is fixedly connected to the second single gate blowout preventer 19, and the lower part of the second single gate blowout preventer 19 is fixedly connected to the upper end of the drilling crossbar 20.

[0048] Preferably, the hydraulic pressure relief valve 8 is a 35MPa hydraulic pressure relief valve;

[0049] Preferably, the hydraulic grouting valve 9 is a 35MPa hydraulic grouting valve, and the grouting pipeline interface 11 is a 35MPa grouting pipeline interface.

[0050] A 35MPa hydraulic pressure relief valve and a 35MPa pressure relief manifold are added and connected to the throttling manifold 21. The closed pressure between the annular blowout preventer 16 and the RCD assembly 3 is remotely and safely relieved through the throttling valve of the throttling manifold 21.

[0051] A 35MPa hydraulic pressure relief valve and pressure relief manifold are added and connected to the choke manifold 21. By remotely opening the manifold, drilling four-way valve 20, and hydraulic flat valve 4, the pressure in the wellbore is compensated to the pressure between the annular blowout preventer 16 and the RCD assembly 3, so that the pressure between the lower part of the annular blowout preventer 16 and the upper part of the annular blowout preventer 16 and the RCD assembly 3 is balanced. Then the annular blowout preventer 16 is opened to avoid opening the annular blowout preventer 16 under pressure, thus avoiding significant damage to the annular blowout preventer rubber core.

[0052] This invention is applicable to drilling operations with narrow pressure windows, high sulfur content requiring pressurized operation, and those that may encounter high-pressure brine layers and require rotary control head technology to relieve trap pressure.

[0053] Example 2

[0054] Please refer to the instruction manual appendix. Figure 1 A drilling method for a rotary control head technology service system for relieving trap pressure and compensating for balance pressure includes the following steps:

[0055] Step 1: Close the annular blowout preventer 16;

[0056] Step 2: Open the hydraulic pressure relief valve 8 and remotely adjust the throttle valve opening of the throttle manifold 21 to orderly release the closed pressure between the upper part of the annular blowout preventer 16 and the RCD assembly 3 to 0 MPa.

[0057] The released trapped liquid or gas passes through a liquid-gas separator for liquid-gas separation. The liquid returns to the buffer tank, and the gas is ignited and burned in the combustion chamber.

[0058] Step 3: Install the new RCD assembly 3 and remotely close the clamps on the RCD housing 2;

[0059] Step 4: Close the choke valve of the choke manifold 21, remotely open the drilling four-way valve 20 and the hydraulic flat valve 4, and connect the pressure in the wellbore with the space between the upper part of the annular blowout preventer 16 and the RCD assembly 3, so that the pressure between the lower part of the annular blowout preventer 16 and the upper part of the annular blowout preventer 16 and the RCD assembly 3 is balanced.

[0060] Step 5: Activate the annular blowout preventer 16 and restore the normal pressurized drilling operation process. Activating the annular blowout preventer 16 when the pressure above and below is balanced effectively avoids or reduces damage to the rubber core of the annular blowout preventer 16 caused by the water-based effect due to the pressure difference between the upper and lower parts of the annular blowout preventer 16. This provides convenient conditions for the continuity of subsequent drilling work and can effectively shut in the well to avoid well control accidents.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary control head technical service system for relieving locking pressure and compensating for balancing pressure, characterized in that: Includes a hydraulic control system (1), an RCD housing (2), an RCD assembly (3), a hydraulic flat valve (4), a union four-way valve (7), a hydraulic pressure relief valve (8), a hydraulic grouting valve (9), a wellhead pressure sensor (10), and a grouting pipeline interface (11); An RCD housing (2) is fixedly installed on the upper part of the annular blowout preventer (16); an RCD assembly (3) is fixedly installed on the upper part of the RCD housing (2); a hydraulic flat valve (4) is fixedly installed on the right end of the RCD housing (2); a union interface (5) for housing connection is fixedly connected to the left end of the RCD housing (2); a union manual ball valve (6) is fixedly installed at the union interface (5); a union four-way valve (7) is fixedly installed at the outlet of the union manual ball valve (6); a hydraulic grouting valve (9) is installed at one end of the union four-way valve (7) and connected to the grouting pipeline interface (11); a hydraulic pressure relief valve (8) is installed at one end and connected to the pressure relief manifold; and a wellhead pressure sensor (10) is connected at the other end; the pressure relief manifold extends to the ground and connects to the throttling manifold (21).

2. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 1, characterized in that, The clamp control line of the hydraulic control system (1) is connected to the clamp cylinder of the RCD housing (2) for remote opening and closing of the clamp of the RCD housing (2); the lubricating oil line of the hydraulic pump station is connected to the lubricating oil connection port of the RCD assembly (3) for remote control of the oil injection and lubrication of the RCD assembly (3).

3. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 2, characterized in that, The cooling water pipeline of the hydraulic pump station is connected to the cooling water connection port of the RCD assembly (3) for remote cooling and cooling of the bearings of the RCD assembly (3); the hydraulic valve control pipeline of the hydraulic control system (1) is connected to the hydraulic plate valve (4) for remote opening and closing of the hydraulic plate valve (4).

4. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 3, characterized in that, The hydraulic control system (1) has a hydraulic grouting valve control line connected to the hydraulic grouting valve (9) for remote opening and closing of the hydraulic grouting valve (9); the hydraulic control system (1) has a hydraulic pressure relief valve control line connected to the hydraulic pressure relief valve (8) for remote opening and closing of the hydraulic pressure relief valve (8).

5. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 4, characterized in that, The hydraulic pressure relief valve (8) is fixedly connected to the upper end of the union elbow (12), the lower end of the union elbow (12) is fixedly connected to the left end of the union line (13), and the right end of the union line (13) is fixedly connected to the throttling manifold (21) through the union interface (14) of the manifold connection.

6. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 5, characterized in that, The right end of the hydraulic flat plate valve (4) is fixedly connected to the slurry outlet (15); the lower part of the annular blowout preventer (16) is fixedly connected to the double gate blowout preventer (17), the lower part of the double gate blowout preventer (17) is fixedly connected to the first single gate blowout preventer (18), the lower part of the first single gate blowout preventer (18) is fixedly connected to the second single gate blowout preventer (19), and the lower part of the second single gate blowout preventer (19) is fixedly connected to the upper end of the drilling cross-connector (20).

7. The rotary control head technical service system for unloading closing pressure and compensating for balancing pressure according to claim 6, characterized in that, The hydraulic pressure relief valve (8) is a 35MPa hydraulic pressure relief valve; the hydraulic grouting valve (9) is a 35MPa hydraulic grouting valve; and the grouting pipeline interface (11) is a 35MPa grouting pipeline interface.

8. A drilling method for a rotary control head technology service system for unloading trap pressure and compensating for balance pressure according to claim 7, characterized in that, Includes the following steps: Step 1: Close the annular blowout preventer (16); Step 2: Open the hydraulic pressure relief valve (8), remotely adjust the throttle valve opening of the throttle manifold (21), and orderly relieve the closed pressure between the upper part of the annular blowout preventer (16) and the RCD assembly (3) to 0 MPa; Step 3: Install the new RCD assembly (3) and remotely close the clamps on the RCD housing (2); Step 4: Close the choke valve of the choke manifold (21), remotely open the drilling four-way valve (20) and the hydraulic flat valve (4), and connect the pressure in the wellbore with the space between the upper part of the annular blowout preventer (16) and the RCD assembly (3), so that the pressure between the lower part of the annular blowout preventer (16) and the upper part of the annular blowout preventer (16) and the RCD assembly (3) is balanced. Step 5: Activate the annular blowout preventer (16) and resume normal pressurized drilling operations.

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