Dynamic Gas Well Allocation for Uneven Water Invasion
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Solution Overview
Problem
Existing production allocation methods for water-bearing carbonatite gas reservoirs are inaccurate and lack operability, failing to consider the impact of water invasion, leading to uneven water invasion and early breakthrough, which complicates gas reservoir development and reduces production efficiency.
Innovation Solution
A water invasion-oriented dynamic production allocation method is established, incorporating a mathematical model that calculates average water invasion rates, stability, and uniformity deviations to optimize production allocation, using deliverability equations and numerical simulations to minimize deviations and enhance production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional production allocation methods are used in water-bearing carbonatite gas reservoirs, then production allocation can be performed, but water invasion becomes uneven and early breakthrough occurs, reducing production efficiency
Solution Approach 1:
The patent applies preliminary action by establishing a water invasion prediction model before production allocation decisions are made. The method calculates water invasion rates and breakthrough risks in advance for different production allocation schemes, allowing operators to select optimal allocation strategies that prevent uneven water invasion and early breakthrough before they occur. This proactive approach improves both productivity and water invasion control reliability.
2Ease of manufacture
If production allocation is optimized without considering water invasion impact, then allocation calculations can be simplified, but water invasion control accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary water invasion prediction model that bridges simple production allocation calculations and complex water invasion control. The model uses easily obtainable reservoir parameters to calculate water invasion rates and breakthrough risks, providing accurate predictions without requiring complex data or calculations. This intermediary approach maintains ease of manufacture while achieving high measurement precision in water invasion prediction.
3Adaptability or versatility
If static production allocation methods are used, then allocation schemes can be established, but they cannot adapt to changing water invasion conditions, reducing effectiveness
Solution Approach 1:
The patent applies dynamics by transforming static production allocation methods into dynamic adaptive schemes. The method calculates water invasion rates and breakthrough risks for different production allocation schemes and uses this information to dynamically adjust allocation decisions. The model adapts to changing water invasion conditions by evaluating multiple scenarios and selecting optimal allocation strategies based on current reservoir state, thereby improving adaptability without excessive complexity.
Data Source
AI summary
The problem that water breakthrough of a single well is too early due to uneven water invasion of an existing water-bearing carbonatite gas reservoir is solved. According to the technical scheme, on the basis of an original gas well production allocation scheme of a water-bearing carbonatite gas reservoir, the average water invasion rate of the reservoir is calculated as a stability reference of water invasion rates throughout the production period. A new water invasion-oriented production allocation method is designed from two aspects of stability of water invasion and uniformity of water invasion driving and meanwhile, a reasonable production allocation range is predicted through a traditional deliverability equation, a n d a water invasion-oriented dynamic production allocation mathematical model is established.