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Well control method for high-pressure reservoir nitrogen well drilling

A nitrogen and reservoir technology, applied in wellbore/well components, earthwork drilling, flushing wellbore, etc., can solve the problem of inability to effectively ensure the safety of nitrogen drilling well control in high-pressure reservoirs, and inability to realize remote control of multi-channel blowout gate valves , complicated operation and other problems, to achieve the effect of realizing rapid wellhead control, satisfying well control safety, and increasing the drainage area

Inactive Publication Date: 2019-04-05
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, multi-channel blowout and gate valve remote control cannot be realized, and the well control safety of nitrogen drilling in high-pressure reservoirs cannot be effectively guaranteed, and the operation is cumbersome and the convenience is poor.

Method used

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  • Well control method for high-pressure reservoir nitrogen well drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A well control method for nitrogen drilling in high-pressure reservoirs, comprising the following steps:

[0033] a. Connect the large-diameter multifunctional cross 11 in the well control equipment to the double-ram blowout preventer 10 and the single-ram blowout preventer 12 respectively;

[0034] b. During nitrogen drilling, when high-pressure and high-yield natural gas is encountered, press the shut-in button of the driller’s emergency button box 24 to issue a well shut-in command, and the PLC main control box 23 receives the well shut-in command, closes the annular blowout preventer 13, and starts Igniter 25 puts and sprays ignition;

[0035] c. Lower the pressure value of the annular blowout preventer 13 to 6MPa, adjust the height of the drilling tool, close the single ram blowout preventer 12, open the annular blowout preventer 13, and complete the well shut-in action.

[0036] This embodiment is the most basic implementation mode, "a, connect the large-diameter...

Embodiment 2

[0038] A well control method for nitrogen drilling in high-pressure reservoirs, comprising the following steps:

[0039] a. Connect the large-diameter multifunctional cross 11 in the well control equipment to the double-ram blowout preventer 10 and the single-ram blowout preventer 12 respectively;

[0040] b. During nitrogen drilling, when high-pressure and high-yield natural gas is encountered, press the shut-in button of the driller’s emergency button box 24 to issue a well shut-in command, and the PLC main control box 23 receives the well shut-in command, closes the annular blowout preventer 13, and starts Igniter 25 puts and sprays ignition;

[0041] c. Lower the pressure value of the annular blowout preventer 13 to 6MPa, adjust the height of the drilling tool, close the single ram blowout preventer 12, open the annular blowout preventer 13, and complete the well shut-in action.

[0042] In the step b, starting the igniter 25 to discharge and ignite refers to passing thro...

Embodiment 3

[0046] A well control method for nitrogen drilling in high-pressure reservoirs, comprising the following steps:

[0047] a. Connect the large-diameter multifunctional cross 11 in the well control equipment to the double-ram blowout preventer 10 and the single-ram blowout preventer 12 respectively;

[0048] b. During nitrogen drilling, when high-pressure and high-yield natural gas is encountered, press the shut-in button of the driller’s emergency button box 24 to issue a well shut-in command, and the PLC main control box 23 receives the well shut-in command, closes the annular blowout preventer 13, and starts Igniter 25 puts and sprays ignition;

[0049] c. Lower the pressure value of the annular blowout preventer 13 to 6MPa, adjust the height of the drilling tool, close the single ram blowout preventer 12, open the annular blowout preventer 13, and complete the well shut-in action.

[0050] In the step b, starting the igniter 25 to discharge and ignite refers to passing thro...

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Abstract

The invention discloses a well control method for high-pressure reservoir nitrogen well drilling, and belongs to the technical field of well drilling engineering. The well control method is characterized by comprising steps of a, connecting large-drift-diameter multifunctional spools in well control equipment with double-ram blowout preventers and single-ram blowout preventers; b, pushing well shut-in buttons of driller emergency button boxes when high-pressure and high-yield natural gas is drilled in nitrogen drilling periods, issuing well shut-in instructions, receiving the well shut-in instructions by PLC (programmable logic control) master control boxes, shutting down annular blowout preventers, turning on blowout valves, and starting up igniters to carry out blowout ignition; c, lowering pressure values of the annular blowout preventers until the pressure values reach 6 MPa, adjusting the heights of drilling tools, shutting down the single-ram blowout preventers, turning on the annular blowout preventers and completing well shut-in actions. The well control method has the advantages that wellheads can be quickly controlled by the aid of the well control method, multi-channel blowout and sluice valves can be remotely manipulated by the aid of the well control method, accordingly, the high-pressure reservoir nitrogen well drilling well control safety requirements can be met,and well control method is quite easy to operate and high in efficiency and is convenient and speedy.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a well control method for nitrogen drilling in high-pressure reservoirs. Background technique [0002] High-pressure reservoirs are usually characterized by deep burial, high pressure and high production. When nitrogen drilling encounters a sudden high-pressure and high-yield natural gas flow, it will inevitably cause relatively strong erosion on the ground equipment, and strong dynamic load will act on the ground equipment. Therefore, ground well control equipment for nitrogen drilling in high-pressure reservoirs should have the characteristics of stability, erosion resistance, and flexible gate valve switching, so as to realize the timeliness and effectiveness of wellhead control and ensure the safety of nitrogen drilling well control. [0003] The existing well control technology for nitrogen drilling in low-pressure reservoirs still mainly uses the supporting te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/06E21B21/16E21B21/08E21B41/00
CPCE21B21/08E21B21/16E21B33/06E21B41/005
Inventor 邓柯邓虎李刚周长虹王虎李宬晓吴俊黄述春
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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