Underground gas storage well wall stability analysis method

An analysis method and gas storage technology, applied in the field of underground gas storage well wall stability analysis, can solve the problems of reducing drilling risk and well wall instability, and achieve the effect of reducing drilling risk and preventing well wall collapse

Inactive Publication Date: 2017-08-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides an analysis method for the well wall stability of an underground gas storage, which is used for judging the fracture degree of the reservoir rock during the drilling construction of the underground gas storage well, and reduces the drilling risk caused by the fracture of the well wall rock. Auxiliary to solve the problem of well wall instability in the field of underground gas storage construction engineering

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  • Underground gas storage well wall stability analysis method
  • Underground gas storage well wall stability analysis method
  • Underground gas storage well wall stability analysis method

Examples

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Embodiment 1

[0087] Taking the drilling example of an underground gas storage in a certain block to further illustrate the analysis method of the well wall stability of the underground gas storage considering the fracture degree of the reservoir rock.

[0088] (1), get large core from a certain reservoir borehole, determine the borehole wall by looking up table 1 rock type coefficient (this table comes from the book "Practical Rock Mass Engineering Technology" in the monograph "Practical Rock Mass Engineering Technology" of Canada Evert Hoek), The rock type coefficient mi=15 of the rock. With reference to the geological strength index of table 2 (this table comes from the monograph " practical rock mass engineering technology " book of Canadian Evert Hoek, the 145th page), determine the geological strength index GSI=55 of borehole wall rock;

[0089] (2), carry out experimental sample processing to the bulk rock core of the obtained reservoir, make 20 groups of standard cylinder borehole w...

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Abstract

The invention discloses an underground gas storage well wall stability analysis method. According to the method, drilling is performed on a destination reservoir in a to-be-drilled block to acquire a rock core, and a type coefficient and a geological strength index of well wall rock are determined; multiple groups of standard cylinder well wall rock core test pieces are made; the mean value of multiple groups of test values is used as well wall rock uniaxial compressive strength of the to-be-drilled block; a well wall rock breaking coefficient formula is defined according to the Hoek-Brown criterion and used for evaluating the reservoir breaking degree; a maximum principal stress value and a minimum principal stress value of each unit of the destination reservoir in the to-be-drilled block are acquired; and the underground gas storage well wall stability is judged according to divided areas with different breaking degrees of the destination reservoir in the to-be-drilled block. When the method is adopted to analyze the underground gas storage well wall stability, the area with a high well wall rock breaking degree can be effectively avoided, and the effects of preventing well wall collapse and lowering the drilling risk can be achieved.

Description

technical field [0001] The invention belongs to the field of underground gas storage construction engineering, and in particular relates to a method for analyzing the stability of a well wall of an underground gas storage. Background technique [0002] Underground gas storage can optimize the gas supply system to meet the needs of natural gas peak shaving, accident emergency and strategic reserves. Especially when natural gas production and sales are far away, underground gas storage can be an irreplaceable facility to ensure the safety of gas consumption. [0003] The wellbore instability is the phenomenon of wellbore instability caused by geological factors, wellbore rock breakage and drilling operations, etc. The wellbore instability is judged and dealt with by the wellbore stability analysis method. The formations involved in the construction of underground gas storages are characterized by many geological layers, poor drillability, large lithology changes, complex pres...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 王建军杨秀娟闫相祯杨尚谕
Owner BC P INC CHINA NAT PETROLEUM CORP
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