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A pressure monitoring method for judging the direction of water flow in horizontal wells with non-uniform liquid production

A pressure monitoring, horizontal well technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve problems such as poor fitting effect, failure to provide judgment on the direction of incoming water, and failure to consider the influence of water injection well interference.

Active Publication Date: 2020-08-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents only provide the process string, and do not provide a specific method for judging the direction of water flow. However, using conventional methods, the existing models and methods for horizontal wells with non-uniform liquid production do not consider the interference of water injection wells. The characteristic fitting effect of the measured pressure derivative curve decline is not good

Method used

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  • A pressure monitoring method for judging the direction of water flow in horizontal wells with non-uniform liquid production
  • A pressure monitoring method for judging the direction of water flow in horizontal wells with non-uniform liquid production
  • A pressure monitoring method for judging the direction of water flow in horizontal wells with non-uniform liquid production

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Experimental program
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Effect test

Embodiment 1

[0090] Such as figure 1 As shown, in the injection-production well patterns of water injection in vertical wells and oil production in horizontal wells with non-uniform liquid production (such as five-point well pattern and seven-point well pattern), the present embodiment takes the five-point well pattern as an example to implement a A pressure monitoring method for judging the direction of water flow in a horizontal well with non-uniform fluid production, comprising the following steps:

[0091] ①Monitor the bottomhole pressure change data of horizontal wells with non-uniform liquid production;

[0092] ②Considering the changes in the working system of the surrounding water injection wells, design the interference test between the water injection wells and the horizontal wells with non-uniform liquid production;

[0093] ③Establish the bottom hole pressure analysis chart of non-uniform liquid producing horizontal wells under the interference of water injection wells;

[00...

Embodiment 2

[0154] Such as figure 1 As shown, a pressure monitoring method for judging the direction of water flow in a horizontal well with non-uniform liquid production includes the following steps:

[0155] ①Monitor the bottomhole pressure change data of horizontal wells with non-uniform liquid production;

[0156] ②Considering the changes in the working system of the surrounding water injection wells, design the interference test between the water injection wells and the horizontal wells with non-uniform liquid production;

[0157] ③Establish the bottom hole pressure analysis chart of non-uniform liquid producing horizontal wells under the interference of water injection wells;

[0158] ④ Use the bottom hole pressure analysis chart of the non-uniform fluid-producing horizontal wells to perform fitting analysis on the measured bottom hole pressure data, and obtain the reservoir parameters under different water injection wells with different water injection rates, and compare them unde...

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Abstract

The invention provides a pressure monitoring method used for judging the incoming-water-direction of an inhomogeneous fluid-producing horizontal well. The pressure monitoring method comprises the following steps of monitoring bottom hole pressure change data of the inhomogeneous fluid-producing horizontal well; considering the change of the work systems of surrounding water injection wells, and designing an interference testing well between the water injection wells and the inhomogeneous fluid-producing horizontal well; building a bottom hole pressure analysis chart of the inhomogeneous fluid-producing horizontal well under the interference of the water injection wells; using the obtained bottom hole pressure analysis chart of the inhomogeneous fluid-producing horizontal well to conduct fitting analysis on the measured bottom hole pressure data to obtain reservoir parameters under the condition of the change of the water injection amount of different water injection wells, and judgingthe incoming-water-direction by analyzing and comparing the parameters which are fitted under the work systems of different water injection wells. Since the change of the water injection amount of thewater injection wells is considered, the incoming-water-direction of the inhomogeneous fluid-producing horizontal well can be accurately judged; meanwhile, using the method to monitor the pressure ofthe inhomogeneous fluid-producing horizontal well better conforms to actual conditions, and the accuracy of pressure monitoring explanation is improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to the field of a pressure monitoring method for judging the water incoming direction of a horizontal well with non-uniform liquid production. Background technique [0002] The combined injection-production method of vertical well water injection and horizontal well oil production has become a common phenomenon in the development of low-permeability reservoirs. Generally, horizontal wells do not participate in production in the entire horizontal section, that is, horizontal wells produce liquid non-uniformly, and the production of horizontal wells decreases Soon, once the water breakthrough rate rises rapidly, the water outlet position of the horizontal well with non-uniform liquid production can be effectively identified by the geopotential method of the horizontal well and the well test analysis method for identifying the liquid production of the horizontal well in stages. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06E21B47/10E21B49/00
CPCE21B47/06E21B47/10E21B49/00
Inventor 程时清李猛于海洋王战国邹雪峰汪洋
Owner CHINA UNIV OF PETROLEUM (BEIJING)