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Early well testing analytical method based on small signal extraction technology

An analysis method and small signal technology, applied in the field of exploration and development of oil and gas fields, can solve problems such as well test analysis that cannot be solved

Inactive Publication Date: 2008-07-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, although there are a large number of articles on early well test analysis in China, they are all based on the theory of convolution and deconvolution linear segment analysis, and only make different assumptions about the afterflow. Well Test Analysis of Directional Flow

Method used

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  • Early well testing analytical method based on small signal extraction technology
  • Early well testing analytical method based on small signal extraction technology
  • Early well testing analytical method based on small signal extraction technology

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Embodiment Construction

[0077] 1. Use small signal extraction technology to realize new graphics

[0078] For a homogeneous infinite formation, the dimensionless pressure at the bottom hole is t D , C D , a function of S, its functional form is very complex

[0079] P D ( t D , C D , S ) = 4 π 2 ∫ 0 ∞ [ 1 - exp ( - u 2 t D ) ] du u 3 {...

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Abstract

The invention provides an early well test analysis method of small signal extraction technology. Based on basic seepage flow mechanics equation, the invention studies the expressions (13) of dimensionless pressure keeping second-order accuracy and derivative thereof at smaller time of the seepage flow mechanics equation, thus obtaining various different typical curves according to the above deduction. The invention can combine a novel substitution pressure derivative curve fitting chart by analyzing the pressure expressions and give a well test analysis method, a uniqueness inspection method, and a pressure reference well test analysis method for obviating the presence of straight-line section of radial flow.

Description

technical field [0001] The invention belongs to oil and gas field exploration and development technology, in particular to an early well test analysis method based on small signal extraction technology. Background technique [0002] Well test interpretation of pressure data has become an indispensable link in the exploration and development of oil and gas fields. As far as well test analysis methods are concerned, there are currently only two methods: straight line segment analysis and pressure and derivative fitting method (nonlinear regression is just replacing manual fitting with computer). , the essence is still the curve fitting method, the numerical well test is only a method of dimensionless pressure calculation different from the analytical solution), these two methods are suitable for a long time, that is, the pressure data after the radial flow appears Explanation. For example, the semi-logarithmic analysis method is based on E i The (x) function can be approxima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/30
Inventor 卢德唐
Owner UNIV OF SCI & TECH OF CHINA
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