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
CN109931056AInactive Publication Date: 2019-06-25SOUTHWEST PETROLEUM UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2019-06-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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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