Method for optimization of well opening time of tight gas reservoir intermittent well

An optimization method and technology for tight gas, applied in wellbore/well components, design optimization/simulation, earth-moving drilling, etc., can solve the problems of lag in understanding, difficult to consider the impact of gas well production, poor reliability, etc., and achieve accurate results. Effect

Pending Publication Date: 2021-01-15
PETROCHINA CO LTD
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Problems solved by technology

Among them, the theoretical analysis method is to use Eclipse numerical simulation, RTA production instability analysis and other software, on the basis of gas well production history matching, by setting different well opening time schemes, predict gas well production and cumulative gas production, and compare different The cumulative gas production under the well-opening time scheme is used to optimize the reasonable well-opening time; however, this method is usually difficult to consider the influence of wellbore fluid accumulation, pipeline freezing and plugging on the gas well production, and the reliability is poor
The empirical statistical method is to select a better well opening time by carrying out comparative tests on the production effects of gas wells at different opening times in the field; this method takes into account the actual production characteristics of gas wells in a short period of time, but the evaluation period is long, and it is difficult to adapt to formation energy. , process measures, liquid accumulation state and other conditions change
[0004] In short, the currently commonly used optimization methods for the start-up time of intermittent gas wells have difficulties such as poor reliability and lag in understanding, and are difficult to meet the actual production needs of gas fields.

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  • Method for optimization of well opening time of tight gas reservoir intermittent well
  • Method for optimization of well opening time of tight gas reservoir intermittent well
  • Method for optimization of well opening time of tight gas reservoir intermittent well

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Embodiment 1

[0044] This embodiment provides a method for optimizing the opening time of intermittent wells in tight gas reservoirs, including the following steps:

[0045] S1, determine the optimization goal: the optimization goal of opening time is to maximize the average daily gas production in the intermittent period;

[0046] S2, analyze and verify the feasibility of maximizing the daily average gas production in the intermittent period as the optimization goal of well opening time;

[0047] S3, call real-time production data: use the real-time production data system to call the absolute production time and instantaneous flow data of the gas well with an hour as the time period;

[0048] S4, calculate the well opening time and intermittent cycle production time at different time points: the cumulative well production time of the gas well is taken as the well opening time, and the sum of the accumulated shut-in time before well opening and the well opening production time is taken as t...

Embodiment 2

[0055] On the basis of Example 1, further, the method of analyzing and verifying the feasibility of maximizing the daily average gas production in the intermittent period as the optimization goal of the opening time is to establish the calculation of the average daily gas production in the intermittent period according to the ARPS decline theory The theoretical model, and through extreme value analysis, determine the maximum daily average gas production and the timing of its occurrence in the intermittent period, and verify its feasibility.

[0056] Specifically, the method for analyzing and verifying the feasibility of maximizing the average daily gas production in the intermittent period as the goal of optimizing the opening time includes the following steps:

[0057] S201, according to the ARPS decline theory, it is determined that the cumulative gas production of depleted declining gas wells has the following relationship with the production time:

[0058] where q t is ...

Embodiment 3

[0071] Taking gas well A in the Shenmu gas field as an example, the well was initially shut down for 70 hours and opened for 168 hours intermittently, and the average daily gas production during the intermittent period was 2,732 million cubic meters per day. The optimization method is used to optimize the opening time of intermittent wells in tight gas reservoirs, including the following steps:

[0072] Step 1) Determine the optimization goal. It is proposed that the maximum daily average gas production in the intermittent period is the optimization goal of the well-opening time, where the intermittent period is the sum of the well-opening time and the well-shut-in time before the well-opening.

[0073] Step 2) Analyze the feasibility of taking the average daily gas production in the intermittent period as the optimization target of opening time. Considering that the production decline of gas wells in tight gas reservoirs is mainly depletion decline, based on the ARPS decline...

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Abstract

The invention provides a method for optimization of the well opening time of a tight gas reservoir intermittent well. The method is characterized in that on the basis of the feasibility analysis of optimization of the well opening time of the intermittent well, a relation curve of the daily average gas production rate of the intermittent period and the well opening time is established by utilizingreal-time production data, and the optimal well opening time of the intermittent gas well is determined by tracking and analyzing the occurrence time of the maximum value of the daily average gas production rate of the intermittent period. Compared with a conventional method, the method considers the actual yield change characteristics of the gas well and has the advantage that the evaluation result is more accurate and reliable.

Description

technical field [0001] The invention belongs to the field of gas field development, and in particular relates to a method for optimizing the opening time of intermittent wells in tight gas reservoirs. Background technique [0002] Tight gas reservoirs (Tight Gas) are an important field of unconventional natural gas exploration in the world. They are typical continuous tight sandstone gas reservoirs with low porosity (<12%) and low permeability (<0.1X10 -3 μm 2 ), low gas saturation (<60%), and high water saturation (>40%), which are widely distributed and have great development potential. , The characteristics of high technical requirements, field practice shows that about 40% of the production time and about 30% of the production of gas wells in tight gas reservoirs need to be maintained by intermittent well switching. Therefore, the optimization of well opening time is an important part of intermittent well management in tight gas reservoirs. Its purpose is t...

Claims

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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 伍勇杜支文杨小龙王磊田敏赵尹琛安卫兵周哲冬刘嘎刘明建马俊明蔡兴利张保国王晔张嫣刘丹丹彭玲
Owner PETROCHINA CO LTD
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