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Pressure prediction method and device for low-permeability glutenite formation

A technology of formation pressure and prediction method, applied in the direction of prediction, data processing application, instrument, etc.

Active Publication Date: 2020-11-06
PETROCHINA CO LTD
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Problems solved by technology

[0010] In oil and gas exploration and development projects, for low-permeability glutenite reservoirs, due to their special structure, there is currently no feasible prediction scheme for the formation pressure of low-permeability glutenite reservoirs

Method used

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  • Pressure prediction method and device for low-permeability glutenite formation
  • Pressure prediction method and device for low-permeability glutenite formation
  • Pressure prediction method and device for low-permeability glutenite formation

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Embodiment Construction

[0056] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0057] refer to figure 1 As shown, the low-permeability glutenite formation pressure prediction method of the embodiment of the present application includes the following steps:

[0058] S101. Under the set pore pressure, obtain the first P-wave velocity of the core at each specified differential stress; and under the set differential st...

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Abstract

An embodiment of the invention provides a low permeable sandy conglomerate stratum pressure prediction method and an apparatus thereof. The method comprises the following steps of under set pore pressure, acquiring a first longitudinal wave speed of a rock core under each assigned differential stress; under a set differential stress, acquiring a second longitudinal wave speed of the rock core under each assigned pore pressure; acquiring a first rate of change of the first longitudinal wave speed along with the differential stress under the set pore pressure; acquiring a second rate of change of the second longitudinal wave speed along with the pore pressure under the set differential stress; according to the first rate of change and the second rate of change, determining an effective stress coefficient of the rock core; and according to the effective stress coefficient of the rock core, determining stratum pressure of a reservoir stratum corresponding to the rock core. In the embodiment of the invention, low permeable sandy conglomerate stratum pressure prediction accuracy can be increased.

Description

technical field [0001] The present application relates to the technical field of oil and gas exploration and development, in particular to a pressure prediction method and device for low-permeability sandy conglomerate formations. Background technique [0002] Effective stress is a basic concept of rock mechanics, first proposed by Terzaghi, who defined effective stress as the difference between the total pressure of the upper layer and the pore fluid pressure: Pd=Pc-Pp. Among them, Pd represents Terzaghi effective stress, that is, pressure difference; Pc is confining pressure; Pp is pore fluid pressure. The effective stress simplifies the two independent variables of confining pressure and pore fluid pressure into one variable, which facilitates the analysis of the properties of porous materials. Any change in physical properties caused by changes in confining pressure and pore fluid pressure can be calculated by effective stress describe. Therefore, it is of great signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 王斌潘建国尹路陈永波黄林军曲永强王国栋许多年齐雯李得滋
Owner PETROCHINA CO LTD
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