Fiber-Reinforced Grout Composition for Leakage Control
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Solution Overview
Problem
Existing grout compositions face issues with leakage due to their inability to remain flowable during insertion and thicken properly, leading to significant losses in porous and fractured rock substrates, and polyolefin fibers are difficult to dry blend with cement, causing dispersion problems.
Innovation Solution
The development of dry blend grout compositions incorporating reinforcement fibers with specific length, diameter, and shape characteristics, such as flat, rectangular, serrated, or embossed polyolefin and aramid fibers, which can be easily dispersed in cementitious materials to enhance dry blending and reduce fluid loss during drilling and grouting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If polyolefin fibers are added to grout compositions, then fluid loss is reduced and cavity plugging is improved, but dry blending with cement becomes difficult and dispersion problems occur
Solution Approach 1:
The patent applies parameter changes by modifying the physical characteristics of polyolefin fibers, specifically reducing their diameter to 0.003-0.010 inches and controlling their length to 0.06-0.25 inches. These parameter changes enable the fibers to be effectively dry-blended with cement while maintaining their fluid loss control properties. The size reduction allows fibers to distribute uniformly during dry mixing without agglomeration, resolving the contradiction between fluid loss reduction and manufacturing ease.
Solution Approach 2:
The patent creates a composite material system by combining specifically sized polyolefin fibers with cement and other grout components. The composite nature of the mixture, with fibers distributed throughout the cement matrix, allows for both effective fluid loss control and proper dry blending. The synergistic interaction between the hydrophobic fibers and cement particles enables simultaneous achievement of dispersion and fluid retention.
2Ease of operation
If grout composition is made flowable for insertion, then ease of placement is improved, but leakage through porous rock increases
Solution Approach 1:
The patent applies dynamics by incorporating fibers that respond to flow conditions. During placement, the fibers remain suspended in the flowable grout, allowing easy injection. Once the grout stops moving and begins to set, the fibers orient and pack together to form a plug structure that prevents leakage. This dynamic behavior allows the grout to transition from a flowable state during insertion to a plug-forming state during setting, resolving the contradiction between placement ease and leakage prevention.
Solution Approach 2:
The fibers act as an intermediary mechanism between the flowable grout and the porous rock formation. During insertion, the fibers remain suspended and do not impede flow. When leakage occurs or placement stops, the fibers migrate to and plug the pore pathways in the rock, acting as a mediator that prevents fluid loss without interfering with the initial flowable placement process.
3Strength
If fiber length is increased to improve reinforcement, then strength is improved, but dispersion and mixing become more difficult
Solution Approach 1:
The patent applies parameter changes by optimizing the fiber length parameter to a specific range of 0.06-0.25 inches. This length is sufficient to provide reinforcement and bridging across cracks while being short enough to allow effective dry blending and uniform dispersion throughout the grout mixture. The controlled parameter range resolves the contradiction between strength enhancement and manufacturing ease by finding the optimal balance point.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of these fibers in grout compositions improves dispersion and mixing, maintains flowability, reduces leakage, and effectively plugs cavities, enhancing the mechanical properties and fluid retention of the grout, thereby minimizing losses and operational challenges.
Implementation Method 1
The addition of reinforcement fibers to drilling liquids increases the carrying capacity without increasing the viscosity of the liquid... the fibers can be incorporated as a lost circulation material into the cement which is used in drilling wells
Implementation Method 2
The presence of reinforcement fibers in the cement can reduce or preclude voids or cracks in the cement and therefore, reduce or preclude the flow of liquids there through... effectively plugs cavities
Implementation Method 3
The addition of reinforcement fibers to drilling liquids increases the carrying capacity without increasing the viscosity of the liquid... maintains flowability
Data Source
AI summary
The invention relates to cementitious or grout compositions and drilling fluids including reinforcement fibers and methods relating thereto. The cementitious or grout compositions include dry blend material and reinforcement fibers. Each of the fibers can have one or more of a pre-selected mean length, denier, diameter and aspect ratio to improve dispersion in dry blending the cementitious or grout compositions.