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Formation pressure determination method under condition of failure in wall shut-in during blowout

A formation pressure and determination method technology, applied in wellbore/well components, earthwork drilling, measurement, etc., can solve the problem of indeterminate formation pressure, standpipe pressure that cannot reflect the bottom hole pressure, and casing pressure that cannot be read, etc. problem, to achieve the effect of simple process

Active Publication Date: 2014-06-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unable to read casing pressure after shut-in in case of severe blowout that prevents shut-in
The conventional method of determining the formation pressure by reading casing pressure and standpipe pressure after shutting in the well cannot be used in the case of severe blowout and the well cannot be shut in
In addition, standpipe pressure does not reflect bottomhole pressure conditions due to drillpipe valves in the drillstring
Therefore, after the blowout occurs, if the blowout is severe and the well cannot be shut down, the existing method will not be able to determine the formation pressure

Method used

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  • Formation pressure determination method under condition of failure in wall shut-in during blowout
  • Formation pressure determination method under condition of failure in wall shut-in during blowout
  • Formation pressure determination method under condition of failure in wall shut-in during blowout

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Embodiment Construction

[0022] Such as figure 1 As shown, the method for determining formation pressure when the well blowout cannot be shut down includes the following steps:

[0023] 1. Install the first pressure gauge and the second pressure gauge on the discharge pipeline

[0024] Such as figure 2 As shown, before drilling, the first pressure gauge 5 and the second pressure gauge 6 are installed on the discharge pipeline 7. The first pressure gauge 5 and the second pressure gauge 6 are separated by a certain distance, the distance is 10m; the first pressure gauge 5 Located between the discharge valve 4 and the second pressure gauge 6;

[0025] 2. Determine the parameters required for formation pressure calculation under the condition that the blowout cannot be shut down

[0026] Determine the required parameters according to site construction data, including: surface temperature, geothermal gradient, casing pressure, well structure, wellbore trajectory, drilling tool assembly, relative density of produc...

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Abstract

The invention relates to a formation pressure determination method under the condition of a failure in wall shut-in during blowout. The method comprises the following steps: a first pressure gauge and a second pressure gauge are additionally mounted on a relief pipeline; required parameters for formation pressure computation under the condition of the failure in the well shut-in during the blowout are determined; valve opening of a relief valve is adjusted to first opening, second opening and third opening separately; the first pressure gauge and the second pressure gauge are read during the first opening, the second opening and the third opening; gas flow rates during the first opening, the second opening and the third opening are computed; bottom hole pressure during the first opening, the second opening and the third opening is computed according to the gas flow rates during the first opening, the second opening and the third opening; and bottom hole formation pressure is computed according to the gas flow rates during the first opening, the second opening and the third opening, and the bottom hole pressure during the first opening, the second opening and the third opening. The formation pressure under the condition of the failure in the well shut-in can be determined with the method; a basis is provided for subsequent well control design and well control construction; and the method is suitable for field use.

Description

Technical field [0001] The invention belongs to the field of oil and gas development, and specifically relates to a method for determining formation pressure in the case that the well cannot be shut down due to a blowout. Background technique [0002] The unpredictability of the formation and fluid in the drilling is large, and the working conditions and downhole conditions involved are complex and diverse, so the occurrence of blowout is unpredictable. After the blowout occurs, in order to ensure the safety of ground equipment and personnel, the gas is discharged through the blowout pipeline and ignited. Killing is required after the blowout. In the killing process, formation pressure is the key parameter for killing design. After the formation pressure is determined, the killing fluid density and the killing fluid displacement can be designed for the killing operation parameters. In the case of severe blowout and the well cannot be shut in, the casing pressure after shut-in ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
Inventor 孙宝江王宁王志远公培斌陈永明孙小辉张振楠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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