Continuous circulation drilling shunting control manifold device and continuous circulation drilling method

Abstract

The invention discloses a continuous circulation well drilling shunting control manifold device and a continuous circulation well drilling method.The continuous circulation well drilling shunting control manifold device comprises a drilling fluid inlet connector, and the drilling fluid inlet connector is connected with the first end of a first four-way joint; the second end of the first four-way joint is sequentially connected with a first manual valve, a second four-way joint, a second manual valve, a first six-way joint, a main pressure release valve, a tee joint, a secondary pressure release valve, a second six-way joint, a secondary valve, a third six-way joint, a short pipe, a fourth six-way joint and a third manual valve, the third manual valve is connected with the third end of the first four-way joint, and the second four-way joint is further connected with a vertical pipe removing joint; a first main passage and a second main passage which are parallel are connected between the first six-way and the fourth six-way, the circulation caliber of the first main passage is larger than that of the second main passage, the first main passage is provided with a main valve, and the second main passage is provided with an auxiliary main valve. According to the device, switching from conventional drilling to continuous circulating drilling can be achieved, the operation process is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure-controlled drilling, and particularly relates to a continuous circulation drilling shunt control manifold device and a continuous circulation drilling method. Background Art

[0002] At present, continuous circulation drilling can realize injecting drilling fluid into the drill string continuously through a bypass pipeline during connection of a single joint, a stand, and tripping operations, maintaining a constant drilling circulation displacement and equivalent density, thereby preventing accidents and complications such as wellbore collapse, overflow, and sand sticking during connection or disconnection of a single joint or a stand. Among them, the shunt control manifold is a surface device for realizing the switching between two pipelines.

[0003] During pipeline switching, since there is no drilling fluid in the pipeline to be switched, direct switching will cause a sudden drop in the flow rate and pressure of the pipeline in circulation, which will further affect the stability of downhole pressure. At present, in addition to the direct switching method, there are also methods of flow channel shunting or filling before switching, which require high precision and fast action of the control valve opening of the hydraulic control box corresponding to the control manifold, resulting in complex control structures and high costs of surface equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a continuous circulation drilling shunt control manifold device and a continuous circulation drilling method, which can realize the switching from conventional drilling to continuous circulation drilling, with a simple operation process and low cost.

[0005] To achieve the above purpose, the present invention provides a continuous circulation drilling shunt control manifold device, including a drilling fluid inlet joint, the drilling fluid inlet joint is connected to the first end of a first four-way joint, the second end of the first four-way joint is sequentially connected with a first manual valve, a second four-way joint, a second manual valve, a first six-way joint, a main pressure relief valve, a three-way joint, a secondary pressure relief valve, a second six-way joint, a secondary valve, a third six-way joint, a short pipe, a fourth six-way joint, and a third manual valve. The third manual valve is connected to the third end of the first four-way joint. The second four-way joint is also connected with a riser joint. A first main passage and a second main passage are connected in parallel between the first six-way joint and the fourth six-way joint. The flow diameter of the first main passage is larger than that of the second main passage. A main valve is provided on the first main passage, and a secondary main valve is provided on the second main passage.

[0006] Preferably, a first bypass passage and a second bypass passage are connected in parallel between the second six-way joint and the third six-way joint. The flow diameter of the first bypass passage is larger than that of the second bypass passage. A secondary valve is provided on the first bypass passage, and a secondary sub-valve is provided on the second bypass passage.

[0007] Preferably, the first six-way joint is selectively connected with a main blind plate or a main check valve, and the main check valve is connected with a main filling port; the second six-way joint is selectively connected with a secondary blind plate or a secondary check valve, and the secondary check valve is connected with a secondary filling port.

[0008] Preferably, the first six-port is also connected to a primary pressure gauge, and the second six-port is also connected to a secondary pressure gauge.

[0009] Preferably, the three-way connection is also connected to a pressure relief joint, and the second six-way connection is also connected to a bypass joint.

[0010] The present invention also discloses a continuous circulation drilling method, which uses the above-mentioned continuous circulation drilling flow diversion control manifold device, comprising:

[0011] Connect the drilling fluid inlet joint to the drilling pump, and connect the riser joint to the derrick riser;

[0012] During conventional drilling, the first manual valve is opened to allow drilling fluid to enter the first cross-connection from the drilling fluid inlet joint, and then enter the well through the first manual valve, the second cross-connection and the riser joint for circulation;

[0013] When it is necessary to switch to continuous circulation drilling, open the third manual valve, the deputy main valve, the main valve and the second manual valve, close the first manual valve, and allow the drilling fluid to enter the first four-way valve from the drilling fluid inlet joint, and pass through the third manual valve, the deputy main valve, the main valve, the second manual valve, the second four-way valve and the riser joint into the drill pipe for circulation.

[0014] Preferably, a first bypass passage and a second bypass passage are connected in parallel between the second six-way and the third six-way, the flow diameter of the first bypass passage is larger than the flow diameter of the second bypass passage, the first bypass passage is provided with a secondary valve, the second bypass passage is provided with a secondary secondary valve, the first six-way is also connected to a main pressure gauge, the second six-way is also connected to a secondary pressure gauge, the three-way is also connected to a pressure relief joint, and the second six-way is also connected to a bypass joint;

[0015] Continuous circulation drilling methods also include:

[0016] When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint to the bypass valve of the continuous circulation valve on the drilling platform, open the secondary valve, and when the readings of the secondary pressure gauge and the main pressure gauge are the same, open the secondary valve, close the central channel of the wellhead continuous circulation valve, the secondary main valve and the main valve, open the main pressure relief valve to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, and then unscrew and connect the new drill pipe;

[0017] After connecting the new drill pipe, open the auxiliary main valve. When the readings of the main pressure gauge and the secondary pressure gauge are the same, open the main valve and the central channel of the wellhead continuous circulation valve, close the auxiliary secondary valve and the secondary valve, open the secondary pressure relief valve to relieve the pressure on the bypass pipeline, remove the bypass pipeline, and resume normal drilling.

[0018] Preferably, the first six-way valve is connected to a main check valve, which is connected to a main filling port; the second six-way valve is connected to a secondary check valve, which is connected to a secondary filling port;

[0019] Continuous circulation drilling methods also include:

[0020] When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint to the bypass valve of the continuous circulation valve on the drilling platform, and use an external pump to fill the drilling fluid into the bypass pipeline through the secondary filling port, the secondary check valve, the second six-way valve and the bypass joint. Then open the secondary valve. When the readings of the secondary pressure gauge and the main pressure gauge are the same, open the secondary valve, close the central channel of the wellhead continuous circulation valve, the secondary main valve and the main valve, open the main pressure relief valve to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, unscrew and connect the new drill pipe.

[0021] After the new drill pipe is connected, the drilling fluid is filled into the riser by an external pump through the main filling port, the main check valve, the first six-way valve, the second manual valve, the second four-way valve and the riser joint, and then the secondary main valve is opened. When the readings of the main pressure gauge and the secondary pressure gauge are the same, the main valve and the central channel of the wellhead continuous circulation valve are opened, the secondary secondary valve and the secondary valve are closed, the secondary pressure relief valve is opened to relieve the pressure on the bypass pipeline, the bypass pipeline is removed, and normal drilling is resumed.

[0022] With respect to the above-mentioned background technology, the continuous circulation drilling diversion control manifold device provided by the present invention comprises a drilling fluid inlet joint, which is connected to the first end of a first four-way valve, and the second end of the first four-way valve is sequentially connected with a first manual valve, a second four-way valve, a second manual valve, a first six-way valve, a main pressure relief valve, a three-way valve, a secondary pressure relief valve, a second six-way valve, a secondary valve, a third six-way valve, a short pipe, a fourth six-way valve and a third manual valve, the third manual valve is connected to the third end of the first four-way valve, the second four-way valve is also connected to a riser joint, and a first main passage and a second main passage in parallel are connected between the first six-way valve and the fourth six-way valve, the flow diameter of the first main passage is larger than the flow diameter of the second main passage, the first main passage is provided with a main valve, and the second main passage is provided with a secondary main valve.

[0023] During the drilling process, the continuous circulation drilling diversion control manifold device is first connected between the mud pump and the riser, that is, the drilling fluid inlet joint is connected to the drilling pump, and the riser joint is connected to the derrick riser. When conventional drilling is required, the first manual valve is opened, and the drilling fluid enters the first four-way from the drilling fluid inlet joint, passes through the first manual valve, the second four-way and the riser joint into the well for circulation. When it is necessary to switch to continuous circulation drilling, the third manual valve, the auxiliary main valve, the main valve and the second manual valve are opened, and the first manual valve is closed. The drilling fluid enters the first four-way from the drilling fluid inlet joint, passes through the third manual valve, the auxiliary main valve, the main valve, the second manual valve, the second four-way and the riser joint into the drill pipe for circulation. In this way, the switch from conventional drilling to continuous circulation drilling can be realized, the operation process is simple, the disadvantages of the complex control structure of the prior art are abandoned, and the cost can be effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a first continuous circulation drilling diversion control manifold device provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a second continuous circulation drilling diversion control manifold device provided by an embodiment of the present invention;

[0027] in:

[0028] 1. Drilling fluid inlet joint; 2. Standpipe joint; 3. Pressure relief joint; 4. Bypass joint; 5. First manual valve; 6. Second manual valve; 7. Third manual valve; 8. Main valve; 9. Deputy main valve; 10. Main pressure relief valve; 11. Secondary pressure relief valve; 12. Secondary valve; 13. Deputy secondary valve; 14. First four-way valve; 15. Second four-way valve; 16. First six-way valve; 17. Three-way valve; 18. Second six-way valve; 19. Third six-way valve; 20. Fourth six-way valve; 21. Short pipe; 22. Main pressure gauge; 23. Secondary pressure gauge; 24. Main blind plate; 25. Secondary blind plate; 26. Main check valve; 27. Secondary check valve; 28. Main filling port; 29. ​​Secondary filling port. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The present invention provides a continuous circulation drilling flow control manifold device, as shown in the attached Figure 1 and attached Figure 2, comprising a drilling fluid inlet joint 1, the drilling fluid inlet joint 1 is connected to the first end of the first four-way valve 15, the second end of the first four-way valve 15 is sequentially connected with the first manual valve 5, the second four-way valve 15, the second manual valve 6, the first six-way valve 16, the main pressure relief valve 10, the three-way valve 17, the secondary pressure relief valve 11, the second six-way valve 18, the secondary valve 12, the third six-way valve 19, the short pipe 21, the fourth six-way valve 20 and the third manual valve 7, the third manual valve 7 is connected to the third end of the first four-way valve 14, the second four-way valve 15 is also connected to the riser joint 2, the first six-way valve 16 and the fourth six-way valve 20 are connected with a parallel first main passage and a second main passage, the flow diameter of the first main passage is larger than the flow diameter of the second main passage, the first main passage is provided with a main valve 8, and the second main passage is provided with a secondary main valve 9.

[0032] During the drilling process, the continuous circulation drilling diversion control manifold device is pre-connected between the mud pump and the riser. The drilling fluid inlet connector 1 is connected to the drilling pump, and the riser connector 2 is connected to the derrick riser.

[0033] During conventional drilling, the first manual valve 5 is opened, and the drilling fluid enters the manifold spool Ⅰ 14 from the drilling fluid inlet joint 1, passes through the first manual valve 5, the second spool 15 and the riser joint 2, and enters the well for circulation.

[0034] When switching to continuous circulation drilling, open the third manual valve 7, the auxiliary main valve 9, the main valve 8 and the second manual valve 6, close the first manual valve 5, and the drilling fluid enters the manifold four-way Ⅰ14 from the drilling fluid inlet joint 1, passes through the third manual valve 7, the auxiliary main valve 9, the main valve 8, the second manual valve 6, the second four-way 15 and the riser joint 2, and enters the drill pipe for circulation.

[0035] In some embodiments, a first bypass passage and a second bypass passage are connected in parallel between the second six-way passage 18 and the third six-way passage 19, the flow diameter of the first bypass passage is larger than the flow diameter of the second bypass passage, the first bypass passage is provided with a secondary valve 12, and the second bypass passage is provided with a secondary secondary valve 13. The first six-way passage 16 can also be connected to a main pressure gauge 22, the second six-way passage 18 is also connected to a secondary pressure gauge 23, the three-way passage 17 is also connected to a pressure relief joint 3, and the second six-way passage 18 is also connected to a bypass joint 4.

[0036] When in use, the drilling fluid inlet joint 1 is connected to the drilling pump, and the riser joint 2 is connected to the derrick riser; the pressure relief joint 3 is connected to the mud tank or throttling manifold through a pipeline, and the bypass joint 4 is connected to the bypass valve of the continuous circulation valve on the drilling floor.

[0037] When it is necessary to connect the drill pipe, first connect the bypass pipeline connected to the bypass joint 4 to the bypass valve of the continuous circulation valve on the drilling platform, then open the secondary valve 13, and when the readings of the secondary pressure gauge 23 and the main pressure gauge 22 are the same, open the secondary valve 12, close the central channel of the wellhead continuous circulation valve, the secondary main valve 9 and the main valve 8, open the main pressure relief valve 10 to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, and finally unhook and connect the new drill pipe.

[0038] After the new rod is connected, first open the auxiliary main valve 9. When the readings of the main pressure gauge 22 and the secondary pressure gauge 23 are the same, open the main valve 8 and the central channel of the wellhead continuous circulation valve, close the auxiliary secondary valve 13 and the secondary valve 12, and then open the secondary pressure relief valve 11 to relieve the pressure on the bypass pipeline, remove the bypass pipeline, and resume normal drilling.

[0039] The first six-way port 16 can be selectively connected to a main blind plate 24 or a main check valve 26 , and the main check valve 26 is connected to a main filling port 28 ; the second six-way port 18 can be selectively connected to a secondary blind plate 25 or a secondary check valve 27 , and the secondary check valve 27 is connected to a secondary filling port 29 .

[0040] It can be seen that two passages with different diameters are arranged in parallel in the main passage and the bypass passage and a filling port is reserved. Before the main passage and the bypass passage are switched, the small-diameter channel can be opened as needed to perform small-flow diversion filling or external pump filling, which ensures the normal circulation pressure and displacement of the drilling operation while preventing large pressure fluctuations, thereby effectively avoiding the occurrence of complicated downhole accidents.

[0041] Specifically, attached Figure 1 The first six-way 16 is shown to be connected to the primary blind plate 24, and the second six-way 18 is connected to the secondary blind plate 25; Figure 2 It is shown that the first six-port 16 is connected to the primary check valve 26 , the second six-port 18 is connected to the secondary check valve 27 , and the primary check valve 26 is connected to a primary filling port 28 , and the secondary check valve 27 is connected to a secondary filling port 29 .

[0042] Based on the attached Figure 2 The structure shown, when filling, when it is necessary to connect the drill pipe, the bypass pipeline connected to the bypass joint 4 is connected to the bypass valve of the continuous circulation valve on the drilling platform, and the drilling fluid is filled into the bypass pipeline through the secondary filling port 29, the secondary check valve 27, the second six-way 18 and the bypass joint 4 by an external pump, and then the secondary secondary valve 13 is opened. When the readings of the secondary pressure gauge 23 and the main pressure gauge 22 are the same, the secondary valve 12 is opened, the central channel of the wellhead continuous circulation valve, the secondary main valve 9 and the main valve 8 are closed, and the main pressure relief valve 10 is opened to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, and the buckle is removed and a new drill pipe is connected.

[0043] After the new drill pipe is connected, the drilling fluid is filled into the riser by an external pump through the main filling port 28, the main check valve 26, the first six-way valve 16, the second manual valve 6, the second four-way valve 15 and the riser joint 2, and then the secondary main valve 9 is opened. When the readings of the main pressure gauge 22 and the secondary pressure gauge 23 are the same, the main valve 8 and the central channel of the wellhead continuous circulation valve are opened, the secondary secondary valve 13 and the secondary valve 12 are closed, and the secondary pressure relief valve 11 is opened to relieve the pressure of the bypass pipeline, and the bypass pipeline is removed to resume normal drilling. The continuous circulation tripping operation process is similar to the above process and will not be expanded in this article.

[0044] The continuous circulation drilling diversion control manifold device provided by the present invention can choose to switch directly after diversion or to switch after filling diversion when switching the circulation path, thereby realizing continuous circulation drilling under different bottom hole pressure control precisions, improving construction efficiency while ensuring the safety of the underground environment, shortening the time for connecting and unloading drill pipes, and effectively reducing drilling costs.

[0045] The present invention also provides a continuous circulation drilling method, which uses the above-mentioned continuous circulation drilling diversion control manifold device. The continuous circulation drilling diversion control manifold device involved can refer to the above-mentioned, and the continuous circulation drilling method can also refer to the description of the continuous circulation drilling diversion control manifold device. The continuous circulation drilling method includes:

[0046] Connect the drilling fluid inlet joint 1 to the drilling pump, and connect the riser joint 2 to the derrick riser;

[0047] During conventional drilling, the first manual valve 5 is opened to allow the drilling fluid to enter the first cross-connection 14 from the drilling fluid inlet joint, and then enter the well through the first manual valve 5, the second cross-connection 15 and the riser joint 2 for circulation;

[0048] When it is necessary to switch to continuous circulation drilling, open the third manual valve 7, the auxiliary main valve 9, the main valve 8 and the second manual valve 6, close the first manual valve 5, and the drilling fluid enters the manifold four-way I 14 from the drilling fluid inlet joint 1, passes through the third manual valve 7, the auxiliary main valve 9, the main valve 8, the second manual valve 6, the second four-way 15 and the riser joint 2, and enters the drill pipe for circulation.

[0049] In some embodiments, a first bypass passage and a second bypass passage are connected in parallel between the second six-way passage 18 and the third six-way passage 19, the flow diameter of the first bypass passage is larger than the flow diameter of the second bypass passage, the first bypass passage is provided with a secondary valve 12, and the second bypass passage is provided with a secondary secondary valve 13; the first six-way passage 16 may also be connected to a main pressure gauge 22, the second six-way passage 18 may also be connected to a secondary pressure gauge 23, the three-way passage 17 may also be connected to a pressure relief joint 3, and the second six-way passage 18 may also be connected to a bypass joint 4;

[0050] The continuous circulation drilling method further includes: the pressure relief joint 3 is connected to the mud tank or the throttling manifold through a pipeline, and the bypass joint 4 is connected to the bypass valve of the continuous circulation valve on the drilling floor;

[0051] When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint 4 to the bypass valve of the continuous circulation valve on the drilling floor, then open the secondary valve 13, and when the readings of the secondary pressure gauge 23 and the main pressure gauge 22 are the same, open the secondary valve 12, close the central channel of the wellhead continuous circulation valve, the secondary main valve 9 and the main valve 8, open the main pressure relief valve 10 to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, and finally unhook and connect the new drill pipe;

[0052] After connecting the new drill pipe, first open the auxiliary main valve 9. When the readings of the main pressure gauge 22 and the secondary pressure gauge 23 are the same, open the main valve 8 and the central channel of the wellhead continuous circulation valve, close the auxiliary secondary valve 13 and the secondary valve 12, and then open the secondary pressure relief valve 11 to relieve the pressure on the bypass pipeline, remove the bypass pipeline, and resume normal drilling.

[0053] In some embodiments, the first six-way port 16 is connected to a primary check valve 26, the second six-way port 18 is connected to a secondary check valve 27, and the primary check valve 26 is connected to a primary filling port 28, and the secondary check valve 27 is connected to a secondary filling port 29;

[0054] Continuous circulation drilling methods also include:

[0055] When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint 4 to the bypass valve of the continuous circulation valve on the drilling platform, and use an external pump to fill the drilling fluid into the bypass pipeline through the secondary filling port 29, the secondary check valve 27, the second six-way 18 and the bypass joint 4, and then open the secondary valve 13. When the readings of the secondary pressure gauge 23 and the main pressure gauge 22 are the same, open the secondary valve 12, close the central channel of the wellhead continuous circulation valve, the secondary main valve 9 and the main valve 8, open the main pressure relief valve 10 to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, unload and connect the new drill pipe.

[0056] After the new drill pipe is connected, the drilling fluid is filled into the riser by an external pump through the main filling port 28, the main check valve 26, the first six-way valve 16, the second manual valve 6, the second four-way valve 15 and the riser joint 2, and then the secondary main valve 9 is opened. When the readings of the main pressure gauge 22 and the secondary pressure gauge 23 are the same, the main valve 8 and the central channel of the wellhead continuous circulation valve are opened, the secondary secondary valve 13 and the secondary valve 12 are closed, and the secondary pressure relief valve 11 is opened to relieve the pressure on the bypass pipeline. The bypass pipeline is removed and normal drilling is resumed.

[0057] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0058] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A continuous circulation drilling diversion control manifold device, It is characterized in that The invention comprises a drilling fluid inlet joint, wherein the drilling fluid inlet joint is connected to the first end of a first four-way valve, the second four-way valve, the second manual valve, the first six-way valve, the main pressure relief valve, the three-way valve, the secondary pressure relief valve, the second six-way valve, the secondary valve, the third six-way valve, the short pipe, the fourth six-way valve and the third manual valve are sequentially connected to the second end of the first four-way valve, the third manual valve is connected to the third end of the first four-way valve, the second four-way valve is also connected to a riser joint, a first main passage and a second main passage in parallel are connected between the first six-way valve and the fourth six-way valve, the flow diameter of the first main passage is larger than the flow diameter of the second main passage, the first main passage is provided with a main valve, and the second main passage is provided with a secondary main valve.

2. The continuous circulation drilling diversion control manifold device according to claim 1, It is characterized in that A first bypass passage and a second bypass passage are connected in parallel between the second six-way passage and the third six-way passage. The flow diameter of the first bypass passage is larger than the flow diameter of the second bypass passage. The first bypass passage is provided with a secondary valve, and the second bypass passage is provided with a sub-secondary valve.

3. The continuous circulation drilling diversion control manifold device according to claim 1 or 2, It is characterized in that The first six-way connection may be selectively connected to a main blind plate or a main check valve, and the main check valve is connected to a main filling port; the second six-way connection may be selectively connected to a secondary blind plate or a secondary check valve, and the secondary check valve is connected to a secondary filling port.

4. The continuous circulation drilling diversion control manifold device according to claim 3, It is characterized in that The first six ports are also connected to a primary pressure gauge, and the second six ports are also connected to a secondary pressure gauge.

5. The continuous circulation drilling diversion control manifold device according to claim 4, It is characterized in that The three-way connection is also connected to a pressure relief joint, and the second six-way connection is also connected to a bypass joint.

6. A continuous circulation drilling method, using the continuous circulation drilling flow diversion control manifold device as claimed in claim 1. It is characterized in that include: Connect the drilling fluid inlet joint to the drilling pump, and connect the riser joint to the derrick riser; During conventional drilling, the first manual valve is opened to allow drilling fluid to enter the first cross-connection from the drilling fluid inlet joint, and then enter the well through the first manual valve, the second cross-connection and the riser joint for circulation; When it is necessary to switch to continuous circulation drilling, the third manual valve, the auxiliary main valve, the main valve and the second manual valve are opened, and the first manual valve is closed, so that the drilling fluid enters the first four-way valve from the drilling fluid inlet joint, and enters the drill pipe through the third manual valve, the auxiliary main valve, the main valve, the second manual valve, the second four-way valve and the riser joint for circulation.

7. The continuous circulation drilling method according to claim 6, It is characterized in that A first bypass passage and a second bypass passage in parallel are connected between the second six-way passage and the third six-way passage, the flow diameter of the first bypass passage is larger than the flow diameter of the second bypass passage, the first bypass passage is provided with a secondary valve, the second bypass passage is provided with a secondary secondary valve, the first six-way passage is also connected with a main pressure gauge, the second six-way passage is also connected with a secondary pressure gauge, the three-way passage is also connected with a pressure relief joint, and the second six-way passage is also connected with a bypass joint; The continuous circulation drilling method further comprises: When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint to the bypass valve of the continuous circulation valve on the drilling platform, open the secondary valve, and when the readings of the secondary pressure gauge and the main pressure gauge are the same, open the secondary valve, close the central channel of the wellhead continuous circulation valve, the secondary main valve and the main valve, open the main pressure relief valve to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, and then unscrew and connect the new drill pipe; After connecting the new drill pipe, open the auxiliary main valve, and when the readings of the main pressure gauge and the secondary pressure gauge are the same, open the main valve and the central channel of the wellhead continuous circulation valve, close the auxiliary secondary valve and the secondary valve, open the secondary pressure relief valve to relieve the pressure on the bypass pipeline, remove the bypass pipeline, and resume normal drilling.

8. The continuous circulation drilling method according to claim 7, It is characterized in that The first six-way connection is connected to a main check valve, which is connected to a main filling port; the second six-way connection is connected to a secondary check valve, which is connected to a secondary filling port; The continuous circulation drilling method further comprises: When it is necessary to connect the drill pipe, connect the bypass pipeline connected to the bypass joint to the bypass valve of the continuous circulation valve on the drilling platform, use an external pump to fill the drilling fluid into the bypass pipeline through the secondary filling port, the secondary check valve, the second six-way valve and the bypass joint, then open the secondary valve, and when the readings of the secondary pressure gauge and the main pressure gauge are the same, open the secondary valve, close the central channel of the wellhead continuous circulation valve, the secondary main valve and the main valve, open the main pressure relief valve to relieve the pressure of the drilling fluid in the drill pipe above the continuous circulation valve, unscrew and connect the new drill pipe; After the new drill pipe is connected, the drilling fluid is filled into the riser through the main filling port, the main check valve, the first six-way valve, the second manual valve, the second four-way valve and the riser joint by an external pump, and then the secondary main valve is opened. When the readings of the main pressure gauge and the secondary pressure gauge are the same, the main valve and the central channel of the wellhead continuous circulation valve are opened, the secondary secondary valve and the secondary valve are closed, the secondary pressure relief valve is opened to relieve the pressure on the bypass pipeline, the bypass pipeline is removed, and normal drilling is resumed.

Images