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摘要: 为解决山西某矿区煤层气钻孔漏失问题，选择合适的堵漏浆液。基于正交试验的设计方法，以低水解聚丙烯酰胺（PHP）、801堵漏剂、水玻璃和植物胶为堵漏材料制成堵漏浆液，测试了堵漏浆液的相对密度、失水量、塑性黏度、表观黏度、和动切力等指标，并采用极差法与方差法分析了各材料（因素）的显著性。研究表明：塑性黏度、表观黏度受PHP的影响最大，水玻璃对失水量影响最大，801堵漏剂对动切力影响最大。以较大的黏度和动切力及较低的失水量为评价依据，确定了堵漏浆液的最优配方。建立了最优配方堵漏浆液的流变方程，模拟试验测定堵漏浆液的堵漏性能，并通过4个煤层气钻孔工程实践验证了堵漏浆液的堵漏功效。Abstract: In order to solve the problem of leakage of coalbed methane wells in a mining area in Shanxi, through choosing suitable plugging slurry, using PHP, 801 plugging agent, water glass and vegetable gum as plugging materials, the index of plugging slurry was measured including specific gravity, water loss, plastic viscosity, apparent viscosity, and dynamic shear force. The significance of each material(factor)was analyzed by range analysis and variance analysis. The results showed that the plastic viscosity and apparent viscosity were most affected by PHP; water glass had the greatest impact on the water loss time; the 801 plugging agent had the greatest impact on the dynamic shear force. The optimum formulation of plugging slurry was determined with larger viscosity, larger shear force and lower water loss. The rheological equation of the optimal formula for plugging slurry was established. The plugging performance of the plugging slurry was measured by simulation test. The plugging efficiency of plugging slurry was inspected by four CBM drilling engineering practices.
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Keywords:
- borehole leakage /
- plugging slurry /
- orthogonal experiment /
- range analysis /
- variance analysis
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