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Quantitative diagnosis method for edge water invasion front edge

A water intrusion, front edge technology, applied in earth-moving drilling, special data processing applications, wellbore/well components, etc., can solve the problems of water-flooded shutdown, insufficient wellbore liquid carrying capacity, wellbore fluid accumulation, etc.

Pending Publication Date: 2021-02-19
PETROCHINA CO LTD
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Problems solved by technology

However, in production practice, people have also found that the production capacity of horizontal wells will drop significantly after water breakthrough, which seriously affects the production of gas wells; and the lack of formation often manifests as insufficient liquid-carrying capacity of the wellbore, resulting in fluid accumulation or even water flooding in the wellbore to stop production

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  • Quantitative diagnosis method for edge water invasion front edge
  • Quantitative diagnosis method for edge water invasion front edge
  • Quantitative diagnosis method for edge water invasion front edge

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Embodiment Construction

[0035] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of approaches consistent with aspects of the application as recited in the appended claims.

[0036] From the above description, it can be seen that the monitoring and forecasting of water invasion in gas reservoirs and horizontal wells is particularly important in the process of gas field development. In related technologies, the main methods used to identify early water invasion in gas reservoirs include: gas well production dynamic characteristics, modern production decline analysis methods, pressure drop curve identification methods, unstable well testing, etc. Generally speaking, the production dynamic characteristics of gas wells, modern production decline analysis...

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Abstract

The invention discloses a quantitative diagnosis method for edge water invasion front edge, and belongs to the technical field of gas field development. The method comprises the steps that pressure recovery well testing pressure data of a target gas well in n periods are obtained, wherein n is a positive integer; for the ith period in the n periods, based on the pressure recovery well testing pressure data of the ith period, a pressure recovery well testing double logarithmic curve of the ith period is drawn, and i is a positive integer smaller than or equal to n; the pressure recovery well testing double logarithm curves of the n periods are superposed to obtain a superposed pressure recovery double logarithm curve; and the distance between the edge water invasion front edge and a wellbore of the target gas well based on the superposed pressure recovery well testing double logarithmic curve is determined. According to the quantitative diagnosis method for the edge water invasion frontedge based on an unstable well testing analysis method, the gas well water invasion characteristics and the change rule thereof and the water body propelling speed can be known by combining the geological characteristics, so that a foundation is laid for optimization and adjustment of a water-bearing gas reservoir development technology strategy.

Description

technical field [0001] The embodiments of the present application belong to the technical field of gas field development, and in particular relate to a quantitative diagnosis method for edge water invasion fronts. Background technique [0002] Water-bearing gas reservoirs refer to gas reservoirs with edge water (or "bottom water"). The production capacity of gas wells will drop significantly after water breakthrough. Therefore, in order to improve the development effect of water-bearing gas reservoirs, people usually adopt methods such as optimizing production pressure difference, production rate, well location deployment and perforation section to delay the water invasion of gas reservoirs and ensure the development of gas reservoirs. Long-term stable production and enhanced ultimate recovery of gas reservoirs. [0003] In order to increase single well production and control production pressure difference in water-bearing gas reservoirs, highly deviated wells (well deviati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 王娟冯曦王芳袁山李玥洋申艳戚涛佘娟姜艺赵梓寒
Owner PETROCHINA CO LTD
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