LCM Test Cell Disk Members for Severe Loss Zone Simulation
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Solution Overview
Problem
Current methods for evaluating loss circulation materials (LCMs) are inadequate for severe loss zones, as they rely on pore plugging tests with disks of insufficiently large openings, which fail to accurately assess LCM performance in extreme drilling conditions with large fractures or vugs.
Innovation Solution
A test apparatus comprising a drilling fluid reservoir, a spacer fluid reservoir, and an LCM reservoir, connected to an LCM test cell with disk members of varying opening sizes up to 40 mm, simulating severe loss zones, allowing for the evaluation of LCMs under high pressures up to 2000 psi and simulating real-world conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pore plugging tests use disks with small openings, then the test apparatus is simple and easy to manufacture, but it fails to accurately assess LCM performance in severe loss zones with large fractures or vugs
Solution Approach 1:
The test apparatus is divided into multiple disk members, each with different opening sizes (e.g., 40 mm, 20 mm, 10 mm openings). This segmentation allows testing of LCM performance across different loss zone severities, from moderate to severe conditions, using a single integrated apparatus.
Solution Approach 2:
The patent transitions from traditional small-opening disks to large-opening disks (up to 40 mm), effectively changing the dimensional scale of the test medium. This dimensional change enables simulation of severe loss zones with large fractures or vugs that were previously impossible to test with conventional apparatus.
2Reliability
If disk members with large openings up to 40 mm are used to simulate severe loss zones, then LCM performance in extreme conditions can be accurately evaluated, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of制造 a single complex large-opening disk, the apparatus uses multiple disk members with different opening sizes. Each disk can be manufactured separately using appropriate methods, then assembled into the test cell, simplifying the overall manufacturing process while enabling comprehensive testing.
Solution Approach 2:
The disk members with large openings (40 mm, 20 mm, 10 mm) serve as scaled models or copies of actual loss zones with different severity levels. These replicated loss zone conditions allow laboratory testing that accurately mimics field conditions without requiring actual downhole testing.
3Adaptability or versatility
If multiple disk members with various opening sizes are implemented, then the apparatus can simulate different loss zone conditions (seepage, moderate, severe), but the device complexity increases
Solution Approach 1:
The test cell is designed as a universal apparatus that can accommodate multiple disk members with different opening sizes. A single test cell structure serves multiple functions by testing LCM performance against various loss zone severities (seepage, moderate, severe) without requiring separate test devices for each condition.
Solution Approach 2:
The versatility is achieved through segmentation of the testing capability into discrete disk members, each representing a specific loss zone severity. This modular approach allows the apparatus to adapt to different testing needs by selecting appropriate disk members while maintaining a relatively simple overall structure.
Data Source
AI summary
A loss circulation material (LCM) testing apparatus includes an LCM testing cell. The LCM testing fluid is a slurry of LCM material and a wellbore drilling fluid. A fluid flow pathway within the LCM testing cell is defined between an inlet and an outlet. The LCM testing cell includes a disk member that is removable positioned in the fluid flow pathway between the inlet and the outlet of the LCM testing cell. The disk member includes a disk base and a plurality of downstream-directed extensions, which combined define a plurality of flow openings. A method of evaluating a loss circulation material (LCM) includes introducing a LCM testing fluid into the LCM testing cell and detecting an amount of LCM testing fluid traversing the LCM test cell.