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Method for simulating variable well storage effect caused by downhole throttling of gas well

A simulation method and effect technology, applied in the direction of complex mathematical operations, design optimization/simulation, etc., can solve the problems of low reliability of simulation results and poor adaptability of variable well storage phenomena, and achieve improved credibility, high practicability, highly reliable effects

Pending Publication Date: 2020-04-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a simulation method of variable well storage effect caused by downhole throttling of gas wells, which overcomes 1 in the prior art: the existing description method is not suitable for downhole throttling conditions of tight gas reservoirs 2. The mechanism of the variable well storage effect under the condition of downhole choke in tight gas reservoirs is different from the mechanism of variable well storage simulated by existing methods. Poor adaptability to well storage phenomenon; 3. Problems such as low reliability of simulation results of existing methods

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  • Method for simulating variable well storage effect caused by downhole throttling of gas well
  • Method for simulating variable well storage effect caused by downhole throttling of gas well
  • Method for simulating variable well storage effect caused by downhole throttling of gas well

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specific Embodiment approach

[0039] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical contents disclosed in the present invention without affecting the functions and objectives of the present invention.

[0040] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any su...

Embodiment 1

[0044] The invention discloses a method for simulating variable well storage effect caused by downhole throttling of a gas well, which comprises the following steps:

[0045] Step 1) Establish a dimensionless wellbore material balance equation under the downhole choke condition, and obtain the dimensionless pressure value under the downhole choke condition;

[0046] Step 2) Based on the dimensionless pressure value described in step 1), draw a logarithmic pressure derivative curve chart to simulate the changing characteristics of variable well storage effect under different parameter combinations under downhole throttling conditions;

[0047]Step 3) Based on the actual pressure recovery data under throttling conditions, make a normalized pseudo-pressure difference and its derivative and the actual measurement curve of the well shut-in time, and draw the double logarithmic pressure derivative curve in step 2) On the chart of the graph, keep the charts of the measured curve and ...

Embodiment 2

[0049] The invention discloses a method for simulating variable well storage effect caused by downhole throttling of a gas well, which comprises the following steps:

[0050] Step 1) Establish a dimensionless wellbore material balance equation under the downhole choke condition, and obtain the dimensionless pressure value under the downhole choke condition;

[0051] Step 2) Based on the dimensionless pressure value described in step 1), draw a logarithmic pressure derivative curve chart to simulate the changing characteristics of variable well storage effect under different parameter combinations under downhole throttling conditions;

[0052] Step 3) Based on the actual pressure recovery data under throttling conditions, make a normalized pseudo-pressure difference and its derivative and the actual measurement curve of the well shut-in time, and draw the double logarithmic pressure derivative curve in step 2) On the chart of the graph, keep the charts of the measured curve and...

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Abstract

The invention discloses a method for simulating a variable well storage effect caused by downhole throttling of a gas well, which comprises the following steps of: 1) establishing a dimensionless wellbore material balance equation under a downhole throttling condition to obtain a dimensionless pressure value under the downhole throttling condition; 2) based on the dimensionless pressure value in the step 1), drawing a double logarithmic pressure derivative curve chart, and simulating the variable well storage effect change characteristics under different parameter combinations under the underground throttling condition; 3) taking actual pressure recovery data under a throttling condition as a basis, drawing an actual measurement curve graph of the normalized pseudo-pressure difference, thederivative of the normalized pseudo-pressure difference and the well closing time, drawing the actual measurement curve graph on a graph plate of the double logarithm pressure derivative curve graphobtained in the step 2), keeping the actual measurement curve graph coinciding with the graph plate of the double logarithm pressure derivative curve graph, solving related parameters of a variable well storage stage according to the fitting key points, and describing a variable well storage effect caused by downhole throttling of the gas well through the related parameters.

Description

technical field [0001] The invention belongs to the technical field of gas field development, and in particular relates to a method for simulating variable well storage effects caused by downhole throttling of gas wells. Background technique [0002] At present, there are three methods used to describe the variable well storage effect at home and abroad, the three methods are Fair method, hegman method, and Spivey method; the Fair method is mainly used to simulate the variable well storage effect caused by wellbore phase separation and thermal effects; Hegman method The method is an improvement of the fair method. The variable well storage mechanism simulated by the two methods is the same. The only difference is that the mathematical models for describing the phase change pressure are different. Fair uses the exponential method, and Hegman uses the error function; the simulation object of the Spivey method is The variable well storage phenomenon is caused by the seal leakag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/11
CPCG06F17/11
Inventor 李小锋刘莉莉范萍廖红梅吴优黄强东范倩倩李志超付斌候科峰
Owner PETROCHINA CO LTD
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