Dynamic analysis method for controlled reserves-variable gas well

An analysis method and variable control technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of inaccurate analysis and estimation of changes in gas well controlled reserves, interwell interference, and limitations

Inactive Publication Date: 2019-06-25
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Second, the influence of interwell interference
[0005] Therefore, the existing single well dynamic analysis theoretical models and interpretation methods are limited by the assumption that the controlled reserves of a single well are fixed, and cannot accurately analyze and estimate the changes in the controlled reserves of a gas well during the long-term production process.

Method used

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  • Dynamic analysis method for controlled reserves-variable gas well
  • Dynamic analysis method for controlled reserves-variable gas well
  • Dynamic analysis method for controlled reserves-variable gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Embodiment 1: as figure 1 As shown, the purpose of the present invention is achieved through the following technical solutions: a dynamic analysis method for gas wells with variable control reserves, which breaks through the limitation of traditional single well dynamic analysis theoretical models and interpretation methods assuming that single well control reserves are fixed, and accurately analyzes and estimates gas wells To control changes in reserves during long-term production, the dynamic analysis method includes the following steps:

[0101] S1. Data segmentation: segment according to the slope change on the pressure index-total material balance time curve;

[0102] S2. Data regression: carry out linear regression according to the real time selection interval in the segment, and determine the initial value of the stage reserves;

[0103] S3. Gas well iteration: perform material balance correction on the gas reservoir.

[0104] The step S1 includes the following...

Embodiment 2

[0189] Example 2: On the basis of Example 1, take Well H1 as a specific implementation case: Well H1 was put into production on July 14, 2014, and analyzed until October 19, 2017. The pressure index is composed of gas-water production and converted flow pressure Analysis curves such as figure 2 As shown, according to the slope change of the pressure index, two stages can be divided, and the reserves are regressed in stages, the average formation pressure is calculated and the pressure drop analysis curve is generated as follows: image 3 The results of the pressure drop analysis are shown in Table 1.

[0190]

[0191] Table 1 Reserve analysis results of Well H1

Embodiment 3

[0192] Example 3: On the basis of Example 1, take Well H8 as a specific implementation case: Well H8 was put into production on October 30, 2014, and analyzed until October 17, 2017. The pressure index is composed of gas-water production and converted flow pressure Analysis curves such as Figure 4 As shown, the slope of the pressure index clearly indicates that there are two stages, and the corresponding reserves are large at the beginning and small at the end. The reserves are obtained by segmental regression, the average formation pressure is calculated and the pressure drop analysis curve is generated as shown in Fig. Figure 5 As shown, the pressure drop analysis results are shown in Table 2.

[0193]

[0194] Table 2H8 Reserve Analysis Results

[0195] The beneficial effect of the present invention is that: the present invention proposes a production dynamic analysis method for multi-stage control of reserves, continues to use the analysis mode of dynamic material ba...

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Abstract

The invention discloses a dynamic analysis method for a controlled reserves-variable gas well, which breaks through the limitation that a conventional single well dynamic analysis theoretical model and a conventional interpretation method assume that single well controlled reserves is fixed, and accurately analyzes and estimates the change of controlled reserves in a long-term production process of a gas well. The dynamic analysis method comprises the following steps: S1. data segmentation: segmenting according to slope change on a pressure index-total material balance time curve; S2. data regression: selecting an interval according to the real time in segments, performing linear regression, and determining an initial value of phase reserve; S3. gas well iteration: performing material balance correction on gas reservoirs. The invention provides the production dynamic analysis method for the controlled reserves in multiple stages, an analysis mode of dynamic material balance is followed, the variation of the controlled diagnoses is reserved through the slope of a pressure material balance time curve, stage division is performed on multi-controlled reserves analysis data, and segmentdata regression analysis is performed, so that the controlled reserves in each stage is estimated.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to a dynamic analysis method for gas wells with variable control reserves. Background technique [0002] In the production process of actual gas reservoirs, the controlled reserves of gas wells often show stage variation due to the influence of reservoirs and production methods. Traditional single well dynamic analysis, including theoretical models and interpretation methods of modern production decline analysis, all assume that the controlled reserves of a single well are fixed, and the drop of flow pressure is regarded as two components: one is the flow of fluid migrating to the well Pressure drop, the second is the drop of formation pressure due to energy depletion; flow pressure drop is related to instantaneous production, and formation pressure drop is related to cumulative production. However, in the process of actual gas reservoir recovery, the controlled re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B41/00
Inventor 陈伟宁飞李德树蒋华全王岩陈理捷李力民任科姜婷婷李强
Owner SOUTHWEST PETROLEUM UNIV
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