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Well killing method used for eliminating gravity displacement of horizontal well

A technology for eliminating gravity and horizontal wells, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc. It can solve the problems of not being able to eliminate gravity displacement, continuous entry of oil and gas into the well, and long well killing time, etc., to achieve Easy operation, short well killing time and low well killing cost

Inactive Publication Date: 2018-12-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also cannot eliminate the continuous entry of oil and gas into the well caused by gravity displacement, and the well killing time is long
None of the above related well killing techniques can eliminate gravity displacement

Method used

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Embodiment Construction

[0039] Below in conjunction with embodiment the present invention is described further.

[0040] A well killing method for eliminating gravity displacement in a horizontal well of the present invention, step S10, determining the closing pressure of the annular blowout preventer according to the well pressure when shutting in the well and the size of the drilling tool closed by the wellhead sealer;

[0041] Obtain the cross-sectional area A of the piston of the annular blowout preventer and the contact area S between the rubber core and the drilling tool according to the size of the annular blowout preventer and the drilling tool; then determine the closing pressure of the annular blowout preventer according to the following formula;

[0042] P 关闭压力 =P 最低 +P 变 A / S-P 井压

[0043] In the formula: P 关闭压力 is the closing pressure of the annular blowout preventer; P 最低 is the minimum closing pressure, which is a known number and is the design parameter of the annular blowout pre...

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PUM

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Abstract

The invention discloses a well killing method used for eliminating the gravity displacement of a horizontal well. The method includes: determining the closing pressure of an annular preventer; openinga ram preventer; hoisting a drilling tool at the speed of 0.3m / s, closing a semi-sealing ram preventer consistent with the drilling tool in the well in size when the length of the hoisted drilling tool reaches the length of a horizontal section in a well bottom, and then opening the annular preventer; starting a drilling fluid pump and opening a throttle valve, regulating the throttle valve to allow casing pressure to be equal to well closing casing pressure before the overflow discharge of the drilling fluid pump, regulating the pump speed of the drilling fluid pump to well killing pump speed, keeping the pump speed unchanged, and reading standpipe pressure at the moment; keeping the pressure of a circulating standpipe unchanged until formation fluid is discharged out of the ground; measuring the well closing casing pressure and the well closing standpipe pressure during pump shutdown and well closing, and judging the well closing casing pressure and the well closing standpipe pressure. The method has the advantages that gravity displacement is eliminated, and one large technical difficulty of the well killing of the horizontal well is solved.

Description

technical field [0001] The invention relates to a method for killing a horizontal well to eliminate gravity displacement, and belongs to the technical field of petroleum exploitation Background technique [0002] There are horizontal wells in all oilfields in my country, but the well killing of horizontal wells is not mentioned in domestic and foreign textbooks. Since the horizontal section of the horizontal well is usually at the level of the oil and gas layer (target layer), gravity displacement always exists. In this way, there is always oil and gas at the wellhead during circulation, and there is still oil and gas at the wellhead when the drilling fluid density is increased. [0003] And the existing well killing method is to adopt the primary well killing technique or the secondary well killing technique. The one-shot well killing technique is to pump the configured killing drilling fluid directly into the well after the well is shut in due to overflow, and discharge ...

Claims

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Application Information

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IPC IPC(8): E21B33/06E21B21/08
CPCE21B33/06E21B21/08
Inventor 杨子莘陈平马天寿
Owner SOUTHWEST PETROLEUM UNIV
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