Method for predicting pore pressure of regional high-pressure saltwater layer by utilizing curvature of face of geologic structure

A technology of pore pressure and area prediction, which is applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of drilling manpower, material loss, contaminated drilling fluid, irregular regional distribution, etc., to prevent downhole complex situations, The effect of preventing well wall collapse

Inactive Publication Date: 2011-01-12
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Because the formation is squeezed and deformed by the structure, an abnormally high-pressure brine layer is formed, and the regional distribution is irregular. During the drilling process, encounters with high-pressure brine layers often occur. When the density of

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  • Method for predicting pore pressure of regional high-pressure saltwater layer by utilizing curvature of face of geologic structure
  • Method for predicting pore pressure of regional high-pressure saltwater layer by utilizing curvature of face of geologic structure
  • Method for predicting pore pressure of regional high-pressure saltwater layer by utilizing curvature of face of geologic structure

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[0017] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] In the long geological age, the salt layer bends due to the crustal fold movement, or the salt layer is arched due to the basement uplift, and the salt water layer enclosed between the salt is abnormally formed by the action of structural compression, uplift and salt rock shaping flow. High pressure and the degree of structural deformation have a certain relationship with the abnormal pressure of the salt water layer. Generally speaking, the more severe the structural deformation, the greater the pore pressure of the abnormally high-pressure salt water layer. The degree of structural deformation can be described by the curvature of any point on the structural surface, and the curvature is inherently related to the mechanical constitutive deformation of the rock. The rock constitutive relationship is a quantitative description o...

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Abstract

The invention discloses a method for predicting pore pressure of a regional high-pressure saltwater layer by utilizing a curvature of face of geologic structure. The method comprises the following steps of: determining a regional distribution regularity of salt and gypsum layers by utilizing seismic data and actual drilling logging data and constructing a contour map, constructing a regional height equation on the contour map by a harmonic trend surface method and determining the main curvature of any point constructing the region, calculating the main stress of any point, establishing a pore pressure prediction model of any point, and determining the pore pressure of the high-pressure saltwater layer. By the method, the scientific evidence for determining the safe density of drilling liquid is provided in field construction of drilling design so as to effectively prevent collapse of the well walls and avoid underground accidents.

Description

technical field [0001] The invention relates to a method for predicting the pore pressure of a regional high-pressure saline layer by using the curvature of a geological structure surface. Background technique [0002] Most of my country's oil and gas resources are concentrated in pre-salt structures, and drilling in salt rock formations is a key technical problem restricting my country's oil drilling. Because the formation is squeezed and deformed by the structure, an abnormally high-pressure brine layer is formed, and the regional distribution is irregular. During the drilling process, encounters with high-pressure brine layers often occur. When the density of the drilling fluid cannot balance the formation pressure, brine will enter The wellbore will pollute the drilling fluid, cause drilling accidents and complex situations, and bring different degrees of loss to the manpower and material resources of drilling operations. Therefore, how to predict the pore pressure of t...

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Application Information

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IPC IPC(8): E21B49/00
Inventor 金衍陈勉卢运虎侯冰梁红军李宁张辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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