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Optimization method and system for gas testing working system of self-spraying shale gas

A working system and shale gas technology, applied in earthwork drilling, wellbore/well components, etc., can solve difficult problems, not suitable for early prediction, long-term production data and other problems, and achieve the effect of working system

Active Publication Date: 2021-11-02
OIL & GAS SURVEY CGS
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Problems solved by technology

[0012] This type of method is mainly used to evaluate the effective control range and producing reserves of production wells. Although it can predict the change of gas well productivity to a certain extent, it requires a long period of production data and is not suitable for early prediction.
[0013] 3. Well testing method with unstable pressure;
[0015] Although a lot of research has been carried out in the past and many achievements have been made, there are still difficult problems in application-oriented early prediction, simplified calculation and reliability assurance. The most important problem is this type of analysis method, which usually takes formation pressure Considered as a constant, on-site gas testing oil and gas reservoir engineers are often more concerned about the change of fracturing fluid backflow formation pressure, and then decide how to replace the nozzle to achieve stable and high production

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Embodiment 1

[0205] This example provides an optimization method for the working system of self-spraying shale gas testing

[0206] In this embodiment, taking the gas testing working system of Jiliye Oil 1 Well as an example, further explain the optimization method of the self-spraying shale gas testing working system provided by the present invention; specifically, as image 3 As shown, the optimization method provided in this embodiment includes:

[0207] 1. Obtain the gas test data, stratum and gas well basic data of Well 1 in Jiliye

[0208] The gas test data include the gas test process, the output data of different production time under different working systems of the nozzle size of the gas test, the pressure and temperature before and after the nozzle, the gas phase density and the flowback liquid density, etc.;

[0209] The basic data of formation and gas well include well depth, formation porosity, fluid viscosity, total compressibility coefficient, half-length of fracture, form...

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Abstract

The invention provides an optimization method and system for a gas testing working system of self-spraying shale gas. The method comprises the steps that a formation pressure determination model suitable for a target well is constructed, wherein the formation pressure determination model is a calculation model of formation pressure about the gas production rate, the original formation pressure and the flowing bottomhole pressure; in an initial stage of fracturing flowback gas testing, yield data and flowing bottomhole pressure data at different production times under different gas testing oil nozzle size working system are obtained; the original formation pressure of the target well is obtained; on the basis of the obtained yield data and the obtained flowing bottomhole pressure data at different production times under the different gas testing oil nozzle size working system as well as the original formation pressure of the target well, the formation pressure changes under all the gas testing oil nozzle size working systems are determined through a flowing bottomhole pressure calculation model; and an optimal gas testing oil nozzle size working system is determined based on the formation pressure changes under all the gas testing oil nozzle size working systems.

Description

technical field [0001] The invention relates to the technical field of shale gas development, in particular to an optimization method and system for a near-spontaneous shale gas testing working system. Background technique [0002] There are many kinds of working systems for gas testing of shale gas wells, and generally, the working systems of gas testing are quite different according to the purpose of gas testing, production stage, and production mode. Generally, the main purpose of gas testing work is divided into two categories: gas reservoir productivity evaluation and formation attribute evaluation, and the productivity stage of shale gas wells is usually divided into initial productivity stage, stable production stage and productivity decline stage, and the production mode can be divided into self-spraying , gas lift, swabbing and other types. [0003] The most important characteristics of flowback fluid flow in the initial stage of fracturing and flowback of self-spr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/005Y02P90/30
Inventor 李耀华徐兴友刘卫彬陈珊白静
Owner OIL & GAS SURVEY CGS
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