CAJ | 학술논문

针对目前煤矿井下水力压裂钻孔封孔理论缺乏，封孔材料密封效果差、成本高，封孔长度不合理等问题，建立了水力压裂钻孔封孔力学模型，得出封孔材料能够承受的最大水压与封孔材料性质、封孔长度等参数之间的关系。综合分析了密封条件、抽采条件以及施工条件下压裂孔的合理封孔长度，并进行现场试验验证。结果表明：封孔材料性质和封孔长度是影响封孔材料能够承受最大水压的主要因素，封孔材料能够承受的最大水压随封孔材料强度、弹性模量以及封孔长度的增大而增大；当封孔长度达到某一定值后，封孔材料能够承受的最大水压随封孔长度的增大而趋于定值。以重庆松藻矿区为例，确定出穿层压裂孔的合理封孔长度为10 m，本煤层压裂孔的合理封孔长度为13 m，现场试验结果与理论分析基本一致。
침대목전매광정하수력압렬찬공봉공이론결핍，봉공재료밀봉효과차、성본고，봉공장도불합리등문제，건립료수력압렬찬공봉공역학모형，득출봉공재료능구승수적최대수압여봉공재료성질、봉공장도등삼수지간적관계。종합분석료밀봉조건、추채조건이급시공조건하압렬공적합리봉공장도，병진행현장시험험증。결과표명：봉공재료성질화봉공장도시영향봉공재료능구승수최대수압적주요인소，봉공재료능구승수적최대수압수봉공재료강도、탄성모량이급봉공장도적증대이증대；당봉공장도체도모일정치후，봉공재료능구승수적최대수압수봉공장도적증대이추우정치。이중경송조광구위례，학정출천층압렬공적합리봉공장도위10 m，본매층압렬공적합리봉공장도위13 m，현장시험결과여이론분석기본일치。
Considering the problems of lacking sealing theory, poor effect and high cost of sealing material and unreasonable sealing length for hydraulic fracturing drilling sealing in mine, mechanical models of sealed drilling for hydraulic fracturing were established. Relationships between the maximum bearing capacity of sealing material and sealing material property, sealing length were obtained. The reasonable sealing lengths of hydraulic fracturing under the sealed conditions, drainage conditions and constructional conditions were analyzed;and the field experiments were conducted. The results show that sealing material property and sealing length are the main factors influencing the maximum bearing capacity of sealing material. The maximum bearing capacity of sealing material increases with the increase of the strength of sealing material, the elasticity modulus and the sealing length. However, when the sealing length reaches a certain value, the maximum bearing capacity of sealing material verges to a constant value along with the increase of the sealing length. Taking Chongqing Songzao mine area as an example, the reasonable sealing length of crossing boreholes for hydraulic fracturing is considered to be 10 m;and the reasonable sealing length of coal seam boreholes for hydraulic fracturing is considered to be 13 m. The results of field experiment and the theoretical analysis are virtually consistent.