Resistivity Logging Model for Accurate Oil Well Skin Factor Estimation
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Solution Overview
Problem
The challenge in predicting the skin factor for oil and gas wells is the complexity and high cost of existing methods, which require detailed process parameters that are difficult to acquire, leading to inaccurate production capacity predictions.
Innovation Solution
A method and apparatus using resistivity logging to acquire data and establish a skin factor calculation model, combining resistivity log information and well test skin factor data to calculate the skin factor accurately, avoiding complex parameter determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the method of combining drill stem test with well test analysis is used to acquire skin factor, then the accuracy of skin factor measurement is improved, but the cost and complexity of the process increases significantly
Solution Approach 1:
The patent introduces resistivity logging as an intermediary measurement tool to indirectly determine skin factor. Instead of directly measuring skin factor through complex drill stem tests, the method uses resistivity logs to measure formation properties (contaminated zone radius, permeability, etc.) and calculates skin factor through established relationships between these parameters, thereby simplifying the measurement process while maintaining accuracy
Solution Approach 2:
The patent replaces the mechanical drill stem test system with an electrical resistivity logging system. By substituting mechanical measurement methods with electrical field-based resistivity measurements, the method achieves the same information gathering (formation properties needed for skin factor calculation) with reduced complexity and cost
2Measurement precision
If the decomposition method of skin factor into various types is used, then the theoretical accuracy is improved, but the quantity of required process parameters increases
Solution Approach 1:
The patent applies segmentation by decomposing the skin factor into distinct components (drilling contamination skin, injection hole skin, well inclination skin, etc.) and calculating each component separately using resistivity logging data. This allows for targeted measurement of formation properties relevant to each skin type without requiring all possible process parameters, as resistivity logs provide the key information needed for each component calculation
3Measurement precision
If detailed process parameters are required for skin factor calculation, then the accuracy of prediction is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent makes the skin factor calculation method universal by using resistivity logging, which is a standard, widely available tool in the industry. The method establishes general relationships between resistivity measurements and skin factor components that can be applied across different wells and formations without requiring well-specific detailed process data, thereby improving ease of operation while maintaining prediction accuracy
Data Source
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AI summary
The present disclosure discloses a method for calculating a skin factor for an oil and gas well based on resistivity logging and a related apparatus, wherein the method includes: acquiring resistivity log information and well test skin factor data of a target zone of an oil and gas field; establishing a skin factor calculation model according to the resistivity log information and the well test skin factor data; and calculating the skin factor of a well to be tested of the oil and gas field according to the skin factor calculation model.