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Evaluation method for physical and chemical action of drilling fluid and shale formation

An evaluation method, mud shale technology, applied in mining geology, oil and gas drilling borehole stability, and oil and gas drilling fields, can solve the problems of lack of comparability, inability to reflect the impact speed and strength of drilling fluid, etc.

Inactive Publication Date: 2016-08-17
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

During the contact process between the drilling fluid and the shale formation, these methods and indicators cannot reflect the speed and intensity of the drilling fluid’s impact on the formation and its interior, and there is also a lack of comparability between the laboratory evaluation results and the actual application in the mine

Method used

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  • Evaluation method for physical and chemical action of drilling fluid and shale formation
  • Evaluation method for physical and chemical action of drilling fluid and shale formation
  • Evaluation method for physical and chemical action of drilling fluid and shale formation

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Embodiment

[0026] Such as figure 1 As shown, an evaluation method for the physical and chemical interaction between drilling fluid and shale formation, which includes the following steps in sequence:

[0027] The first step is to observe and describe the mud shale in the mine, prepare and screen core samples;

[0028] The second step is to test the acoustic time difference and resistivity of the core at different water absorption time points under the formation conditions;

[0029] The third step is to evaluate the hydration intensity of the shale according to the acoustic time difference of the core at different water absorption time points;

[0030] The fourth step is to evaluate the hydration rate of the mud shale according to the change of the resistivity of the core at different water absorption time points;

[0031] In the first step, observe the shale and determine the direction of its bedding plane, use an air corer to drill cores along the normal direction perpendicular to the...

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Abstract

The invention discloses an evaluation method for the physical and chemical action of a drilling fluid and a shale formation, belongs to the technical field of petroleum and gas drilling, and relates to the technical field of petroleum and gas drilling well wall stability and mining geology. The method mainly comprises the following steps that shale in a mine field is observed and described, and a shale core is prepared and screened; the interval transit time and the resistivity of the shale core at the different water absorption time points are tested; the hydration strength of the shale is evaluated according to the interval transit time of the shale core at the different water absorption time points; the hydration speed of the shale is evaluated according to the changing condition of the resistivity of the shale core at the different water absorption time points. According to the evaluation method, operation is convenient, results are accurate and reliable, and the hydration characters of the shale can be quantitatively evaluated to provide a basis for adjusting the density of drilling fluid slurry.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling, and relates to the technical fields of oil and gas drilling borehole stability and mining geology. Background technique [0002] There are many mature methods and indicators in the field of traditional drilling for the evaluation of the interaction between drilling fluid and shale formation, such as linear expansion rate, rolling recovery rate, etc. However, these methods and indicators are mainly to express and characterize the final state or result of the interaction between shale and drilling fluid, and lack of reflection on the internal dynamic change process of formation rock during the interaction process. During the contact process between drilling fluid and shale formation, these methods and indicators cannot reflect the speed and intensity of drilling fluid's impact on the formation and its interior, and there is also a lack of comparability between the laboratory evaluation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/005
Inventor 刘向君曾韦梁利喜雷梦王光兵
Owner SOUTHWEST PETROLEUM UNIV
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