Temporary Plugging Agent for High-Temperature Reservoir Fracturing
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Solution Overview
Problem
Current temporary plugging agents for high-temperature oil and gas reservoirs face challenges such as limited pressure bearing capacity, difficulty in transportation due to winding restrictions, and inadequate research on particle-based plugging materials, particularly under high-temperature conditions, necessitating a material with high temperature resistance and good plugging performance that is easily degradable.
Innovation Solution
A temporary plugging agent composed of acrylamide, composite crosslinking agents, laponite, ammonium persulfate, and water, with a specific preparation method involving dissolution, gelation, and air-drying to create a granular form suitable for high-temperature applications, which can withstand temperatures up to 160°C and achieve 100% degradation within 12 hours, ensuring effective plugging and fracturing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fiber temporary plugging agents are used, then ease of plugging is improved, but pressure bearing capacity deteriorates
Solution Approach 1:
The patent uses composite crosslinking agents comprising both linear crosslinking agents (N,N-methylenebisacrylamide) and branched crosslinking agents (polyethylene glycol diacrylate) to create a composite gel structure that combines the ease of plugging of fibers with enhanced pressure bearing capacity through the synergistic effect of different crosslinking mechanisms
Solution Approach 2:
The patent optimizes the mass ratio of linear to branched crosslinking agents (5:2) and controls the crosslinking degree to achieve the desired balance between plugging ease and pressure bearing capacity, demonstrating parameter changes to resolve the contradiction
2Strength
If composite steering materials are used, then plugging efficiency and pressure bearing capacity are improved, but transportation difficulty increases due to winding restrictions
Solution Approach 1:
The patent segments the crosslinking process into two stages: first forming a linear crosslinked network for structural integrity, then adding branched crosslinking agents to enhance pressure bearing capacity, allowing each component to be optimized independently for both strength and transportability
3Productivity
If conventional acid fracturing technology is used, then fracturing capability is improved, but safety and efficiency deteriorate due to ultra-deep drilling risks
Solution Approach 1:
The patent introduces a floating agent as an intermediary substance that forms a plugging barrier at the top of the reservoir, restraining fracture propagation upward and enabling safe ultra-deep fracturing by controlling the direction and extent of fracture expansion
Solution Approach 2:
The temporary plugging agent is designed to automatically degrade after serving its purpose, with degradation rate increasing with temperature, achieving complete degradation within 12 hours at reservoir temperature without requiring additional intervention or leaving harmful residues
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 agent provides excellent plugging performance at high temperatures, ensures sufficient construction time without reservoir pollution, and effectively extends fractures vertically, enhancing the probability of communicating with hydrocarbon-rich fractures and caves, thus facilitating safe and efficient exploitation of deep, unconventional reservoirs.
Implementation Method 1
composite crosslinking agent 1%, including polyethylene glycol diacrylate and N,N-methylenebisacrylamide
Implementation Method 2
laponite 1%, adding laponite to water and stirring until the laponite is completely dissolved
Implementation Method 3
ammonium persulfate 0.1%, adding ammonium persulfate and stirring until the ammonium persulfate is completely dissolved
Implementation Method 4
achieve 100% degradation within 12 hours at temperatures up to 160°C
Data Source
AI summary
Disclosed are a temporary plugging agent and a preparation method thereof, and a method for temporary plugging and fracturing of a high-temperature reservoir. The temporary plugging agent includes the following components in mass fractions: acrylamide 5%, composite crosslinking agent 1%, laponite 1%, ammonium persulfate 0.1% and water 92.9%.