单体复合凝胶在裂缝型油藏侧钻井中的应用  

Application of Monomeric Composite Gel in Side- track Wells Drilled in Fractured Reservoirs

作　　者：伍亚军[1] 马淑芬[1] 张建军[1] 李亮[1] 

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830011

出　　处：《特种油气藏》2015年第4期137-139,158,共3页Special Oil & Gas Reservoirs

基　　金：国家"973"项目"碳酸盐岩缝洞型油藏提高采收率基础研究"(2011-CB-201-006)

摘　　要：塔河油田缝洞型油藏地层温度大于120℃,地层水矿化度为21×104mg/L,储层特征复杂,可固化颗粒堵剂对裂缝型无接替产层、油水同出的侧钻井适应性较差。因此,研制了单体复合凝胶体系。通过室内耐温抗盐实验、突破压力梯度和封堵率实验、堵剂选择性实验对单体复合凝胶进行了评价。结果表明:单体复合凝胶在130℃、30×104mg/L矿化度条件下,突破压力梯度大于9 MPa/m,封堵率大于99%,并具有良好的选择性,能优先进入高渗透水层,迫使水流改向,提高低渗裂缝相对产液量和面积波及系数。现场试验证实,单体复合凝胶封堵强度较高,耐温、抗盐性能强,增油效果明显,具有良好的经济效益和推广应用价值。Fractured vuggy reservoirs in the Tahe Oilfield have formation temperatures over 120℃ with formation water salinity of 21 × 104 mg / L. With consideration to complicated reservoir features,solidifiable particulate plugging agents are less adaptable to side- track wells drilled in fractured formations without supplements and wells with production of both oil and water. To tackle these problems,the monomeric composite gel system was developed. Lab tests for pressure resistance,salinity resistance,pressure gradient,plugging and selective tests for plugging agents were conducted to assess the performance of the monomeric composite gel system. Research results show that,under temperature of 130℃ and salinity of 30 × 104 mg / L,the monomeric composite gel has breaking pressure gradients over 9 MPa / m and plugging efficiency over 99%. In addition,the gel displayed outstanding selective performances by penetrating the water layer with high permeability to divert the water flow and during the course enhance relative fluid productivity of fractures with low- permeability and promote areal sweep efficiency. On- site application results show the monomeric composite gel has desirable plugging strength with high resistance to temperature and salinity. With favorable capacity for productivity enhancement,the gel has high economic efficiency and may be promoted in application.

关 键 词：碳酸盐岩 裂缝型油藏 单体复合凝胶 侧钻水平井 塔河油田 

分 类 号：TE358[石油与天然气工程—油气田开发工程]