玛18井区压裂支撑剂适应性研究  

FracturingProppant Adaptability in the Wellblock Ma18

作　　者：田刚[1] 肖阳 石善志[1] 何文 李桂霞[1] 刘子龙 Tian Gang;Xiao Yang;Shi Shanzhi;He Wen;Li Guixia;Liu Zilong(PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Chengdu University of Technology,Chengdu,Sichuan 610059,China;ChengduLigong Sun-Energy Technology Co.Ltd.,Chengdu,Sichuan 610059,China)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]成都理工大学,四川成都610059 [3]成都理工阳光能源科技有限公司,四川成都610059

出　　处：《特种油气藏》2020年第3期169-174,共6页Special Oil & Gas Reservoirs

基　　金：国家青年科学基金“多尺度多场应力耦合致密砂岩体积改造裂缝评价模型研究”(51504042);国家科技重大专项“鄂南致密低渗油藏水力压裂裂缝起裂及扩展规律”(2016ZX05048-001-04-LH);四川省教育厅基金重点项目“自流注水关键节点仿真及流动耦合计算模型研究”(18ZA0063)。

摘　　要：为了研究玛18井区压裂支撑剂的适应性,在不同铺置方式和不同闭合压力下,对不同压裂支撑剂的导流能力与压裂后效果进行分析评价,根据小型压裂测试、闭合后分析等解释结果,进行储层压裂后特性分析,并对石英砂部分代替陶粒效果进行论证。结果表明:当高闭合应力时,增大铺砂浓度可有效提高裂缝导流能力,但分段式铺砂不能提高裂缝导流能力;混合支撑剂和全陶粒支撑剂的改造井地层能量与裂缝类型均类似,但混合支撑剂井的地层系数、动态储量均不如全陶粒井,且日均压降高于全陶粒井。研究认为,石英砂替代陶粒效果较差,主要原因在于:在裂缝改造类型相同时,由于储层埋深较大,地应力较高,混合支撑剂无法满足所处深度的地应力。通过计算动态储量可知,长期开采时陶粒支撑剂比石英砂支撑剂更有利于节省成本,建议在玛18区块继续采用全陶粒支撑剂。In order to determine the fracturing proppant adaptability in the Wellblock Ma18,the conductivities and post-fracturing performances of different proppant categories were analyzed under different proppant placing patterns and closing pressures.The post-fracturing reservoir properties were analyzed according to the mini-frac test and post-closing analysis.In addition,it also presents the fracturing performance of partially replacing ceramsite with quartz sand.Result indicates that high sand placing concentration could effectively enhance the fracture conductivity under high closing stress condition,but subsection sand placing is incapable of enhancing fracture conductivity.The formation coefficient and dynamic reserve of the well with mixed proppant are all lower than that of well with all-ceramsite under similar formation pressure and fracture category,and the corresponding daily pressure drop is higher than that of well with all-ceramsite.Research illustrates that replacing ceramsite with quartz sand shows a relatively poor fracturing performance.The major reason is that under the similar fracture category,the mixed proppant is unable to meet the in-site geo-stress due to the greater reservoir depth and higher in-situ geo-stress.According to the dynamic reserve calculation,it can be concluded that ceramsiteproppant is more cost-effective than quartz sand proppant in long-term production.Full ceramsiteproppant is recommended in the Wellblock Ma18.

关 键 词：石英砂 陶粒 导流能力 压裂 支撑剂 玛18井区 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]