Automatic throttling monitoring manifold for large-drift-diameter well drilling

Abstract

The utility model discloses an automatic throttling monitoring manifold for large-drift-diameter well drilling, which comprises an inlet four-way joint, a first pressure control throttling pipeline, a second pressure control throttling pipeline, a third blowout pipeline and a fourth monitoring pipeline, and one interface of the inlet four-way joint is connected with wellhead equipment; the other three interfaces are respectively connected with a first pressure control throttling pipeline, a second pressure control throttling pipeline and a third blowout pipeline; the first pressure control throttling pipeline and the second pressure control throttling pipeline have the same structural composition and are standby for each other; the third blowout pipeline is provided with a special-shaped five-way connector, and the other three connectors of the special-shaped five-way connector are connected with the tail end of the first pressure control throttling pipeline, the tail end of the second pressure control throttling pipeline and the initial end of the fourth monitoring pipeline correspondingly. According to the 5 ''* 35MPa large-drift-diameter automatic throttling monitoring manifold suitable for large-displacement operation of the ultra-deep well, fluid with larger displacement can pass through, circulating friction resistance is reduced, and wellhead pressure is reduced, so that the service life is prolonged, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas drilling and production well control, in particular to a large-diameter automatic throttling monitoring manifold. Background Art

[0002] With the continuous extension of oil and gas field exploration, higher requirements are put forward for well control, and corresponding well control management is also receiving more and more attention. As oil and gas exploration and development develops towards deep layers, complex areas, new areas and deep sea, drilling becomes more difficult. As the key link in the development and control of oil reservoirs, the safety of wellbore is very important.

[0003] In today's technological environment, the application of managed pressure drilling technology in drilling operations is increasing. Managed pressure drilling technology can not only prevent blowouts, but also protect oil and gas formations. It also plays a very important role in avoiding resource damage and environmental pollution. The throttle manifold is the main component for achieving pressure control. Therefore, the application of the throttle manifold in drilling operations is particularly important.

[0004] The choke manifold mainly implements well killing operations through the throttling effect of the throttle valve, replaces the contaminated mud in the well, controls the wellhead casing pressure and the riser pressure at the same time, restores the pressure control of the mud column on the bottom of the well, and stops overflow; through the pressure relief effect of the throttle valve, the inlet casing pressure is reduced, which will achieve "soft well shut-in"; through the large-scale discharge effect of the blowout valve, the wellhead blowout preventer group is protected.

[0005] The throttle manifold is generally composed of two or more throttle valves and a multi-channel high-pressure manifold. When the fluid flows from the throttle valve into the high-pressure manifold, a large pressure difference will be generated due to the high pressure and fast flow rate. In addition, the fluid contains impurities such as chemical liquid and bottom mud, which will cause great corrosion and impact on the rear end of the throttle valve. The throttle manifold has a short life and is prone to leakage, posing a safety hazard. In addition, during the drilling process, there are abnormal situations such as block drop, which may cause the throttle valve or flow meter to be blocked, and it cannot be cleaned in time, affecting the use.

[0006] At present, the 4”x35MPa drilling throttle manifold is widely used in China, which has gradually failed to meet the requirements of ultra-deep well operations. The existing throttle manifold is not suitable for large-displacement pressure-controlled drilling. The displacement is high when drilling in large boreholes and shallow layers. The circulation friction is large when the displacement is large, which is not conducive to the bottom hole pressure control phenomenon. Summary of the invention

[0007] Aiming at the problem that the currently commonly used drilling throttle manifold cannot meet the requirements of large-displacement pressure-controlled drilling in ultra-deep well operations, the utility model provides a 5"x35MPa large-diameter drilling automatic throttle monitoring manifold suitable for large-displacement operations in ultra-deep wells.

[0008] The utility model provides a 5"x35MPa large-diameter drilling automatic throttling monitoring manifold, which includes an inlet spool, a first pressure-controlled throttling pipeline, a second pressure-controlled throttling pipeline, a third blowout pipeline and a fourth monitoring pipeline. One interface of the inlet spool is connected to an inlet flange union, and is connected to a wellhead device through an inlet flange union, and the other three interfaces are respectively connected to the first pressure-controlled throttling pipeline, the second pressure-controlled throttling pipeline and the third blowout pipeline. The first pressure-controlled throttling pipeline, the second pressure-controlled throttling pipeline and the third blowout pipeline are all used for throttling and pressure reduction.

[0009] The first pressure-control throttling pipeline and the second pressure-control throttling pipeline have the same structural composition and are spatially symmetrical. The first pressure-control throttling pipeline and the second pressure-control throttling pipeline are used in one and reserved in the other, so as to enhance the practicality of the throttling manifold and reduce the possibility of accidents.

[0010] The first pressure-control throttling pipeline includes a first manual flat valve, a first hydraulic throttling valve, a first short section, a first angle joint and a fourth manual flat valve connected in sequence according to the fluid flow direction. The second pressure-control throttling pipeline includes a second manual flat valve, a second hydraulic throttling valve, a second short section, a second angle joint and a fifth manual flat valve connected in sequence according to the fluid flow direction. The first manual flat valve and the second manual flat valve are respectively connected to the two interfaces of the inlet four-way. The first hydraulic throttling valve and the second hydraulic throttling valve both use a 4-inch control throttle valve to control the circulating fluid.

[0011] The third blow-out pipeline includes a third manual flat valve, a special-shaped five-way joint, a sixth manual flat valve, a three-way joint, and an outlet flange union which are sequentially connected according to the fluid flow direction. The third manual flat valve is connected to an interface of the inlet four-way joint. The two interfaces of the special-shaped five-way joint are respectively connected to the fourth manual flat valve and the fifth manual flat valve. The third blow-out pipeline is used for blow-out pressure reduction.

[0012] The fourth monitoring pipeline includes a seventh manual flat valve, a third angle joint, a flow meter, a fourth angle joint, a third short joint, a fifth angle joint, a fourth short joint, a sixth angle joint and an eighth manual flat valve which are sequentially connected according to the fluid flow direction. The seventh manual flat valve is connected to an interface of the special-shaped five-way joint. The eighth manual flat valve is connected to an interface of the three-way joint.

[0013] The first manual flat valve, the second manual flat valve, the third manual flat valve, the fourth manual flat valve, the fifth manual flat valve, the sixth manual flat valve, the seventh manual flat valve and the eighth manual flat valve are all rising stem gate valves.

[0014] Compared with the prior art, the utility model is beneficial in that:

[0015] (1) The 5"x35MPa large-diameter automatic throttling monitoring manifold of the utility model can pass a larger displacement of fluid, reduce circulation friction, increase the pressure control operation window, and reduce wellhead pressure, thereby extending the service life and eliminating safety hazards.

[0016] (2) The problem that the throttle valve or flow meter is blocked and cannot be cleaned in time during the pressure control process is solved; by switching between the first manual flat valve, the second manual flat valve and the third manual flat valve, online maintenance of single-channel equipment can be achieved, thereby increasing the safety and efficiency of on-site equipment.

[0017] (3) Moreover, each pipeline is connected by a standard flange, thereby reducing the risk of fluid leakage from the connection point.

[0018] (4) The integration of the throttling and pressure control manifold and the monitoring manifold is conducive to the transmission of equipment data and the realization of real-time data monitoring.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main view of the large-diameter automatic throttling monitoring manifold of the utility model.

[0021] Figure 2 It is a top view of the large-diameter automatic throttling monitoring manifold of the utility model.

[0022] Figure 3 It is a rear view of the large-diameter automatic throttling monitoring manifold of the utility model.

[0023] Figure 4 It is an isometric drawing of the large-diameter automatic throttling monitoring manifold of the utility model.

[0024] Numbers in the figure:

[0025] 1-first pressure control throttling pipeline, 51-inlet flange union, 10-inlet cross-way, 11-first manual flat valve, 12-first hydraulic throttle valve, 13-first short joint, 14-first angle joint, 15-fourth manual flat valve;

[0026] 2-second pressure control throttling pipeline, 21-second manual flat valve, 22-second hydraulic throttle valve, 23-second short joint, 24-second angle joint, 25-fifth manual flat valve;

[0027] 3-the third blowdown pipeline, 31-the third manual flat valve, 32-the special-shaped five-way joint, 33-the sixth manual flat valve, 34-the three-way joint, 52-the outlet flange union;

[0028] 4-fourth monitoring pipeline, 41-seventh manual flat valve, 42-third angle joint, 43-flow meter, 44-fourth angle joint, 45-third short section, 46-fifth angle joint, 47-fourth short section, 48-sixth angle joint, 49-eighth manual flat valve. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] like Figure 1-4 As shown, the 5"x35MPa large-diameter drilling automatic throttling monitoring manifold provided by the utility model includes an inlet spool 10, a first pressure-controlled throttling pipeline 1, a second pressure-controlled throttling pipeline 2, a third blowout pipeline 3 and a fourth monitoring pipeline 4. One interface of the inlet spool 10 is connected to the inlet flange turn union 51, and is connected to the wellhead equipment through the inlet flange turn union 51, and the other three interfaces are respectively connected to the first pressure-controlled throttling pipeline 1, the second pressure-controlled throttling pipeline 2 and the third blowout pipeline 3. Through this part of the connection structure, the fluid in the well is guided to the large-diameter drilling automatic throttling monitoring manifold of the utility model for throttling, pressure reduction and monitoring. The first pressure-controlled throttling pipeline 1, the second pressure-controlled throttling pipeline 2, and the third blowout pipeline 3 are all used for throttling and pressure reduction.

[0031] The first pressure control throttling pipeline 1 and the second pressure control throttling pipeline 2 have the same structure and are spatially symmetrical. The first pressure control throttling pipeline 1 and the second pressure control throttling pipeline 2 are used in one and used as a backup to enhance the practicality of the throttling manifold and reduce the possibility of accidents.

[0032] The first pressure control throttling pipeline 1 includes a first manual flat valve 11, a first hydraulic throttling valve 12, a first short section 13, a first angle joint 14 and a fourth manual flat valve 15 connected in sequence according to the fluid flow direction. The second pressure control throttling pipeline 2 includes a second manual flat valve 21, a second hydraulic throttling valve 22, a second short section 23, a second angle joint 24 and a fifth manual flat valve 25 connected in sequence according to the fluid flow direction. The first manual flat valve 11 and the second manual flat valve 21 are respectively connected to the two interfaces of the inlet four-way 10. The first hydraulic throttling valve 12 and the second hydraulic throttling valve 22 both use 4-inch control throttle valves to control the circulating fluid. The larger throttling area can improve the fluid's passability, reduce the circulation friction resistance, and achieve safe and efficient pressure control throttling. Moreover, the first pressure control throttling pipeline 1 and the second pressure control throttling pipeline 2 are spatially symmetrical in the case of completely the same structure, which greatly reduces the equipment footprint, reduces the equipment width, and improves the convenience of equipment use and the practicality of transportation.

[0033] The third blowdown pipeline 3 includes a third manual flat valve 31, a special-shaped five-way joint 32, a sixth manual flat valve 33, a three-way joint 34, and an outlet flange union 52, which are sequentially connected according to the fluid flow direction. The third manual flat valve 31 is connected to an interface of the inlet four-way 10. The two interfaces of the special-shaped five-way joint 32 are respectively connected to the fourth manual flat valve 15 and the fifth manual flat valve 25. The special-shaped five-way joint 32 refers to a flange installed on the basis of an ordinary five-way joint. The third blowdown pipeline 3 is used for blowdown pressure reduction.

[0034] The first pressure-controlled throttling pipeline 1, the second pressure-controlled throttling pipeline 2 and the third blow-out pipeline 3 are respectively connected to the inlet spool 10 through the first manual flat valve 11, the second manual flat valve 21 and the third manual flat valve 31. In actual operation, the on-site operating technician can open the corresponding manual flat valve according to the needs to guide the fluid in the inlet spool 10 to the first pressure-controlled throttling manifold 1, the second pressure-controlled throttling manifold 2 or the third blow-out pipeline 3.

[0035] The fourth monitoring pipeline 4 includes a seventh manual flat valve 41, a third angle joint 42, a flow meter 43, a fourth angle joint 44, a third short section 45, a fifth angle joint 46, a fourth short section 47, a sixth angle joint 48 and an eighth manual flat valve 49 which are sequentially connected according to the fluid flow direction. The seventh manual flat valve 41 is connected to an interface of the special-shaped five-way joint 32. The eighth manual flat valve 49 is connected to an interface of the three-way joint 34. The flow meter 43 is preferably a Coriolis flow meter.

[0036] The angle joints, tee joints, cross joints and the like used in the utility model are all designed according to API standards, and the special-shaped five-way joint is a common five-way joint designed according to API standards with flanges added thereto.

[0037] The first manual flat valve 11, the second manual flat valve 21, the third manual flat valve 31, the fourth manual flat valve 15, the fifth manual flat valve 25, the sixth manual flat valve 33, the seventh manual flat valve 41, and the eighth manual flat valve 49 are all rising stem gate valve structures, which can realize visual operation management and reduce the risk of misoperation by on-site personnel.

[0038] It should be noted that when the pressure control and throttling pipeline 1 is in a normal working state, the second manual flat valve 21 and the third manual flat valve 31 need to be in a closed state, and the fluid can pass through the first throttling pipeline to reduce the pressure. Similarly, when the second throttling and pressure control pipeline needs to be used, the first manual flat valve 11 and the third manual flat valve 31 need to be closed.

[0039] Further, it should be noted that after the fluid is depressurized and flows through the converging special-shaped five-way joint 32, the third blow-out pipeline 3 or the fourth monitoring pipeline 4 can be selected according to the working conditions or equipment conditions. When the fourth monitoring pipeline 4 is in a normal working state, the seventh manual flat valve 41 and the eighth manual flat valve 49 are in an open state, the sixth manual flat valve 33 is in a closed state, and the fluid is monitored through the fourth monitoring pipeline 4.

[0040] In actual application of the large-diameter drilling automatic throttling monitoring manifold, when the pipe pressure is too high and the first pressure-controlled throttling manifold 1 and the second throttling pipeline 2 cannot meet the pressure reduction demand, the operator can open the third manual flat valve 31 and the sixth manual flat valve 33 and use the third blowdown pipeline 3 to release the pressure.

[0041] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A large-diameter drilling automatic throttling monitoring manifold, characterized in that: It includes an inlet spool, a first pressure-controlled throttling pipeline, a second pressure-controlled throttling pipeline, a third blowout pipeline and a fourth monitoring pipeline, wherein one interface of the inlet spool is connected to the wellhead equipment, and the other three interfaces are respectively connected to the first pressure-controlled throttling pipeline, the second pressure-controlled throttling pipeline and the third blowout pipeline; The first pressure-control throttling pipeline and the second pressure-control throttling pipeline have the same structural composition, including a manual flat valve, a hydraulic throttling valve, a short joint, an angle joint and another manual flat valve connected in sequence according to the fluid flow direction; the hydraulic throttling valve adopts a 4-inch control throttling valve; The third blowdown pipeline includes a manual flat valve, a special-shaped five-way joint, another manual flat valve, a three-way joint and an outlet flange union which are connected in sequence according to the direction of fluid flow; the other three interfaces of the special-shaped five-way joint are respectively connected to the end of the first pressure-controlled throttling pipeline, the end of the second pressure-controlled throttling pipeline and the initial end of the fourth monitoring pipeline; the other interface of the three-way joint is connected to the end of the fourth monitoring pipeline; the special-shaped five-way joint is a five-way joint with a flange installed.

2. The large-diameter drilling automatic throttling monitoring manifold according to claim 1 is characterized in that: The first pressure-control throttling pipeline includes a first manual flat valve, a first hydraulic throttling valve, a first short section, a first angle joint and a fourth manual flat valve which are connected in sequence according to the direction of fluid flow; the second pressure-control throttling pipeline includes a second manual flat valve, a second hydraulic throttling valve, a second short section, a second angle joint and a fifth manual flat valve which are connected in sequence according to the direction of fluid flow; the first manual flat valve and the second manual flat valve are respectively connected to the two interfaces of the inlet four-way.

3. The large-diameter drilling automatic throttling monitoring manifold according to claim 2 is characterized in that: The third blowdown pipeline includes a third manual flat valve, a special-shaped five-way joint, a sixth manual flat valve, a three-way joint, and an outlet flange union which are connected in sequence according to the fluid flow direction; the third manual flat valve is connected to an interface of the inlet four-way joint; the two interfaces of the special-shaped five-way joint are respectively connected to the fourth manual flat valve and the fifth manual flat valve.

4. The large-diameter drilling automatic throttling monitoring manifold according to claim 3 is characterized in that: The fourth monitoring pipeline includes a seventh manual flat valve, a third angle joint, a flow meter, a fourth angle joint, a third short section, a fifth angle joint, a fourth short section, a sixth angle joint and an eighth manual flat valve which are connected in sequence according to the fluid flow direction; the seventh manual flat valve is connected to an interface of the special-shaped five-way joint; the eighth manual flat valve is connected to an interface of the three-way joint; the third angle joint and the fourth angle joint have the same structure, and are both formed by adding flanges to the angle joint.

5. The large-diameter drilling automatic throttling monitoring manifold according to claim 4 is characterized in that: All manual flat plate valves are rising stem gate valves.

6. The large-diameter drilling automatic throttling monitoring manifold according to claim 1, characterized in that: An interface of the inlet cross is connected to the inlet flange turning union, and is connected to the wellhead equipment through the inlet flange turning union.

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