CAJ | 학술논문

碳酸盐岩储层的储集空间复杂多变,天然裂缝发育,基质渗透率一般小于1×10~(-3) μm~2,压裂改造是该类储层投产开发的一项关键技术.鉴于目前碳酸盐岩储层压裂改造成功率低,广泛调研了国内外碳酸盐岩加砂压裂的改造实例,分析认为压裂液滤失严重、储层可动流体饱和度低、缝高控制难、施工压力高、施工压力对砂浓度敏感是碳酸盐岩压裂改造的主要难点.从加强储层展布预测和测试压裂评价、降低压裂液滤失和消除多裂缝、利用酸预处理和加重压裂液降低破裂压力和施工压力、改进压裂液的抗剪切性能和携砂能力、优化压裂规模和优选施工参数等方面提出了相应的对策,对提高碳酸盐岩储层加砂压裂改造的成功率具有指导意义.
탄산염암저층적저집공간복잡다변,천연렬봉발육,기질삼투솔일반소우1×10~(-3) μm~2,압렬개조시해류저층투산개발적일항관건기술.감우목전탄산염암저층압렬개조성공솔저,엄범조연료국내외탄산염암가사압렬적개조실례,분석인위압렬액려실엄중、저층가동류체포화도저、봉고공제난、시공압력고、시공압력대사농도민감시탄산염암압렬개조적주요난점.종가강저층전포예측화측시압렬평개、강저압렬액려실화소제다렬봉、이용산예처리화가중압렬액강저파렬압력화시공압력、개진압렬액적항전절성능화휴사능력、우화압렬규모화우선시공삼수등방면제출료상응적대책,대제고탄산염암저층가사압렬개조적성공솔구유지도의의.
The matrix permeability is generally less than 1×10~(-3) μm~2 in carbonate gas reservoirs with many developed natural fractures and complicated and changeable storage space, so sand fracturing is one of the key technologies for the exploitation of these reservoirs. In view of a low success ratio of sand fracturing in carbonate gas reservoirs, we investigated into many cases of sand fracturing at home and abroad. Results from this study showed that the difficulties of sand fracturing include serious filtration loss, low saturation of mobile fluid, uneasy control of fracture height, high operating pressure and its sensitivity to sand concentration, etc. Also the corresponding countermeasures are outlined here as follows: reservoir spread prediction, prefrac test analysis, using particles, proppant slug, or oil-soluble filtrate reducer to reduce the fluid loss and remove multiple fractures, using acid pretreatment and weighted fracture fluid to reduce breakdown pressure and pumping pressure, improving fracture fluid properties, optimizing fracturing and its parameters, and so on. These methods would be meaningful to improve the success ratio of sand fracturing in carbonate gas reservoirs propped.