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Fine pressure control well-drilling vertical pipe flow division control device and back pressure compensation method thereof

A pressure-management drilling and control device technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve problems such as bottomhole pressure fluctuations, avoid excessive fluctuations, and avoid sudden increases in pump strokes greater or lesser effect

Active Publication Date: 2017-09-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]The process of stopping the general mechanical pump is to directly reduce the number of pump strokes to 0, resulting in a short-term reduction of the annular circulation pressure loss to 0, so that, resulting in Pressure fluctuations, the process of starting the pump is opposite to stopping the pump, which will also cause fluctuations in bottomhole pressure

Method used

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  • Fine pressure control well-drilling vertical pipe flow division control device and back pressure compensation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, as attached figure 1 As shown, the flow diversion control device for fine pressure-controlled drilling riser is characterized in that it includes a main pipe 1 and an angular displacement sensor 10; a first gate valve 2, a first gate valve 3, and a second gate valve are sequentially connected to the main pipe 1 4 and flow meter 5, a shunt pipe 6 is communicated with the main pipe 1 between the first gate valve 2 and the first gate valve 3, and a second gate valve 7 is serially connected to the shunt pipe 6 along the fluid direction , the throttle valve 8 and the third gate valve 9 , the signal output end of the throttle valve 8 communicates with the signal input end of the angular displacement sensor 10 . The angular displacement sensor 10 collects the area opening value of the throttle valve 8. This device adds a shunt pipe 6 on the main pipe 1 and a throttle valve 8 on the shunt pipe 6. By calculating the area opening degree of the throttle valve 8 and t...

Embodiment 2

[0025] Embodiment 2, as the optimization of embodiment 1, as attached figure 1 As shown, a bypass pipe 11 is communicated between the main pipe 1 before the first gate valve 2 and the main pipe 1 after the flowmeter 5 , and a fourth gate valve 12 is connected in series on the bypass pipe 11 . The purpose of setting up the bypass pipe 11 is to close the first gate valve 2 and the first ram when the manifold of the main pipe 1 and the manifold of the diversion pipe 6 in the flow diversion control device of the fine-managed pressure drilling riser of the present invention fail. Valve 3, the second gate valve 4, the second gate valve 7 and the third gate valve 9, open the fourth gate valve 12, the drilling fluid from the drilling pump enters the main pipe 1, passes through the bypass pipe 11 and then enters the drill pipe through the main pipe 1 , so that the main pipe 1 manifold and the shunt pipe 6 manifold can be repaired and troubleshooted.

Embodiment 3

[0026] Embodiment 3, as the optimization of embodiment 1 and embodiment 2, as attached figure 1 As shown, a pressure relief pipe 13 is communicated with the bypass pipe 11 after the fourth gate valve 12 along the fluid direction, and a fifth gate valve 14 is connected in series on the pressure relief pipe 13 . After the pressure relief pipe 13 stops the pump conveniently, the pressure accumulated in the manifold is discharged by the pressure relief pipe 13, so as to avoid the pressure of the manifold and ensure the safe operation of production.

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Abstract

The invention relates to the technical field of well-drilling pressure control and relates to a fine pressure control well-drilling vertical pipe flow division control device and a back pressure compensation method thereof. The device comprises a main pipe and an angular displacement sensor. The main pipe is sequentially in series connection with a first gate valve, a first sluice valve, a second gate valve and a flowmeter. The main pipe between the first gate valve and the first sluice valve is communicated with a flow division pipe, the flow division pipe is sequentially in series connection with a second sluice valve, a throttle valve and a third gate valve, and the throttle valve is communicated with the angular displacement sensor. According to the fine pressure control well-drilling vertical pipe flow division control device, the displacement entering a pitshaft can be gradually increased / reduced in pressure control well drilling so that the flow division pipe can have enough time to compensate for well bottom pressure change caused by pump shutdown / pump. Thus, even if a pump is shut down or started, sudden increase or reduction of pump speed can also be effectively avoided, well bottom pressure fluctuation resulting from too high well opening annulus pressure consumption fluctuation is effectively avoided, and it is ensured that the well bottom pressure is kept stable in the mechanical pump shutdown / starting process.

Description

technical field [0001] The invention relates to the technical field of drilling pressure control, and relates to a fine pressure-management drilling standpipe flow diversion control device and a fine-management pressure drilling riser diversion return pressure compensation method. Background technique [0002] Drilling with a narrow density window often has the problem of opening the pump and stopping the pump to spray; in order to solve this problem, the managed pressure drilling technology, namely MPD (Managed Pressure Drilling), is introduced. Its main technical features are: the combination of tools and technology, through pre-controlling the annular pressure profile, can reduce the risk and investment related to drilling in a narrow safe density window; , cyclic friction and wellbore geometry are analyzed and controlled comprehensively. Managed pressure drilling can observe changes in wellbore pressure, dynamically control annular pressure, and more economically comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/08E21B21/10
CPCE21B21/08E21B21/10
Inventor 伊明陈若铭兰作军戴勇黄学刚刘伟刘永伟
Owner BC P INC CHINA NAT PETROLEUM CORP