Development of Nanofluid Slickwater System for Stimulating Mahu Tight Glutenite Reservoirs
-
摘要: 玛湖油田致密砂砾岩油藏压裂液减阻剂为阴离子聚合物,易于与高矿化度配制水和压裂液添加剂中的有机或者无机阳离子发生反应而形成沉淀,堵塞致密砂砾岩孔隙,造成近井地带压力异常升高,不利于压裂裂缝的进一步延伸。为了实现储层保护、促进裂缝扩展,研究提出了一套具有原位驱油功能的纳米排驱滑溜水体系,结合室内环路摩阻测试和表界面张力测试实验,确定了该体系中各个组成部分的添加比例,并依据玛湖油田现场实验数据和实验材料,对整个纳米排驱剂体系的持续抗剪切能力、耐盐能力、溶解能力和洗油能力进行评价。结果表明,所研发的纳米排驱滑溜水体系在1.2×104s-1剪切速率下,减阻率为78.92%,且在该剪切速率下,利用玛湖油田不同矿化度配制水所配制的纳米排驱滑溜水体系剪切20 min减阻率依旧保持在73%以上,同时通过使用索氏提取装置测定纳米排驱滑溜水体系对玛湖油田油砂的洗油能力为93.3%。初步筛选出一套适用于玛湖油田砂砾岩油藏的纳米排驱滑溜水体系。Abstract: The drag reducer of fracturing fluid in the tight glutenite reservoir of the Mahu Oilfield is a kind of anionic polymer, which is easily precipitated by the reaction with organic or inorganic positive ions in fracturing additives. The precipitations can easily block the pores of tight glutenite, and cause an abnormal pressure increase in the near-wellbore. It will be not conducive to the further extension of the fracture. In order to realize reservoir protection and promote crack propagation, a nanofluid slick water system with in-situ oil displacement ability was developed. Loop test and surface tension test were used to determine the optimal doses of each components in this system. Based on the field data and materials of Mahu oilfield, continuous shearing resistance, salt tolerance, solvency and wash oil ability of the nanofluid system were evaluated. The results show that, under the shearing rate of 1.2×104s-1, the drag reduction efficiency of the fluid is 78.92%. In addition, the nanofluid system can work well at the different salinity of the formation water of Mahu oilfield. At the same shearing rate, the drag reduction efficiency after 20 min shearing is still above 73%. What's more, the wash oil efficiency of the system is determined to be 93.3% by the Soxhlet extraction system with Mahu oil sand.
-
[1] 许江文,李建民,邬元月,等. 玛湖致密砾岩油藏水平井体积压裂技术探索与实践[J]. 中国石油勘探, 2019, 24(2):241-249.XU Jiangwen,LI Jianmin,QI Yuanyue,et al. Exploration and practice of horizontal well volume fracturing technology in the Mahu tight conglomerate reservoir[J]. China Petroleum Exploration,2019,24(2):241-249. [2] 程晓倩,刘华勋,熊伟,等. 新疆低渗透砂砾岩油藏自发渗吸实验研究[J]. 科学技术与工程,2013,13(26):7793-7797.CHENG Xiaoqian,LIU Huaxun,XIONG Wei,et al. Experimental study on spontaneous infiltration of low permeability glutenite reservoirs in Xinjiang[J]. Science Technology and Engineering,2013,13(26):7793-7797. [3] 吕振虎. 新疆油田玛湖地层水配制有机硼胍胶压裂液的应用[J]. 科学技术与工程,2018,18(30):80-85.LYU Zhenhu.Application of organic boron rubber fracturing fluid in Mahu formation water in Xinjiang Oilfield[J].Science Technology and Engineering,2018, 18(30):80-85. [4] 蒋官澄,许伟星,黎凌,等. 减阻水压裂液体系添加剂的优选[J]. 钻井液与完井液,2013,30(2):69-72.JIANG Guancheng,XU Weixing,LI Ling,et al. Optimization of additives for drag reduction fluid fracturing fluid system[J]. Drilling Fluids & Completion Fluids,2013,30(2):69-72. [5] 龙政军. 压裂液添加剂对压裂效果的影响及分析[J]. 钻采工艺,2002,25(2):76-79.LONG Zhengjun.Effect and analysis of fracturing fluid additive on fracturing effect[J]. Drilling & Production Technology,2002,25(2):76-79. [6] WASAN D,ALEX N,KIRTI K. The Wetting and spreading of nanofluids on solids:role of the structural disjoining pressure[J].Current Opinion in Colloid & Interface Science,2011,16(4):344-349. [7] XU Q,LI Q,XU W,et al. Enhancement of the wettability and lubrication of shale rock via nanoemulsions[J]. International Journal of Polymer Science,2017,43(4):256-267. [8] LIANG Tianbo,YANG Zhao,ZHOU Fujian.A new approach to predict field-scale performance of friction reducer based on laboratory measurements[J].Journal of Petroleum Science and Engineering,2017,159:927-933. [9] 孟磊,周福建,刘晓瑞,等. 滑溜水用减阻剂室内性能测试与现场摩阻预测[J]. 钻井液与完井液,2017, 34(3):105-110.MENG Lei,ZHOU Fujian,LIU Xiaorui,et al.Indoor performance test and field friction prediction of drag reducer for slip water[J]. Drilling Fluids & Completion Fluid,2017,34(3):105-110. [10] 黄亮,王锐,王巧云. 激光粒度分析仪标准纳米粒子的粒度分布测定[J]. 暨南大学学报(自然科学与医学版),2013,34(3):311-314. HUANG Liang,WANG Rui,WANG Qiaoyun. Determination of particle size distribution of standard nanoparticles in laser particle size analyzer[J]. Journal of Jinan University(Natural Science & Medicine Edition), 2013, 34(3):311-314. [11] 张小雨.油砂矿含油率的测定及油砂分离初步研究[D]. 郑州大学硕士论文,2015. ZHANG Xiaoyu. Determination of oil content in oil sands and preliminary study on oil sands separation[D]. Master's thesis of Zhengzhou university, 2015.
点击查看大图
计量
- 文章访问数: 490
- HTML全文浏览量: 121
- PDF下载量: 195
- 被引次数: 0