Sized Bridging Materials Classification for Drill-in Fluid Durability
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Solution Overview
Problem
The oil and gas drilling industry lacks a reliable and comprehensive method for screening and evaluating the durability of bridging materials used in drill-in fluids, which are crucial for maintaining the intended particle size distribution and preventing formation damage during drilling operations.
Innovation Solution
A classification scheme for sized bridging materials is developed, which includes a durability metric and a D50 shift factor analysis to determine the relative strength of bridging materials, allowing for the selection of appropriate materials for drill-in fluids based on their durability and compatibility with downhole conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridging materials are used to prevent fluid loss and build filter cake, then fluid loss prevention is improved, but the materials may disintegrate and decompose under downhole conditions, losing their structural durability
Solution Approach 1:
The patent applies preliminary action by conducting durability testing on bridging materials before they are used in drill-in fluids. The testing simulates downhole conditions to evaluate how materials will perform under extreme temperatures and pressures, allowing selection of materials that have already been proven to maintain structural integrity. This prevents the contradiction from occurring in practice by selecting materials that won't disintegrate under operational conditions.
Solution Approach 2:
The patent applies parameter changes by testing bridging materials across a range of simulated downhole conditions including varying temperatures and pressures. By evaluating material performance under different parameter conditions, the patent identifies materials that maintain their structural durability across the full range of expected operational parameters, ensuring reliable fluid loss prevention without disintegration.
2Reliability
If bridging materials are selected for optimal particle size distribution to match reservoir pore throat sizes, then bridging ability is improved, but decomposition into finer particles destroys the intended distribution scheme and harms drilling operation
Solution Approach 1:
The patent applies preliminary action by conducting durability testing that specifically measures changes in particle size distribution under simulated downhole conditions. This testing is performed before field use to identify materials that will maintain their intended particle size distribution, ensuring that the optimal bridging ability is preserved throughout the drilling operation without decomposition into harmful fine particles.
Solution Approach 2:
The patent applies feedback by using the results of durability testing to select bridging materials that demonstrate stability in their particle size distribution under downhole conditions. The testing provides feedback on which materials will maintain their composition, allowing engineers to make informed selections that ensure both optimal bridging ability and compositional stability during actual drilling operations.
3Reliability
If durability testing of bridging materials is implemented to assess quality, then material selection reliability is improved, but testing complexity and time requirements increase
Solution Approach 1:
The patent applies taking out by extracting the essential durability evaluation from complex field testing scenarios and consolidating it into a standardized laboratory testing procedure. The method isolates the critical factors (temperature, pressure, particle size distribution changes) and tests them in a controlled environment, simplifying the overall assessment process while maintaining reliability in material selection for drill-in fluid applications.
Data Source
AI summary
A classification scheme for classifying sized bridging materials is disclosed. The scheme identifies a durability metric for the sized bridging materials. The scheme then identifies a value range having a higher relative strength and a lower relative strength. The sized bridging materials may then be tested according to the durability metric and associated with a relative strength based on the durability metric determined during the test.