针对页岩气井钻井液的新型滤失造壁性能评价方法  

New Method for Evaluating Filtration and Mud Cake Building Performance of Drilling Fluid for Shale Drilling

作　　者：王平全[1] 敬玉娟 彭真[2] 白杨[1] 谢俊妮 WANG Pingquan;JING Yujuan;PENG Zhen;BAI Yang;XIE Junni(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,Sichuan 610500;Sichuan Oil and Gas Construction Engineering Co., Ltd., Chengdu, Sichuan 610500;School of Chemistry and Chemical Engineering, Chengdu, Sichuan 610500)

机构地区：[1]西南石油大学.油气藏地质及开发工程国家重点实验室,成都610500 [2]四川石油天然气建设工程有限责任公司,成都610500 [3]西南石油大学化学化工学院,成都610500

出　　处：《钻井液与完井液》2017年第2期51-56,共6页Drilling Fluid & Completion Fluid

基　　金：西南石油大学油气藏地质及开发工程国家重点实验室开放基金(PLN201615)

摘　　要：鉴于目前页岩油气开采中使用致密低渗测试介质来测试滤失造壁性能的需要,从紧密堆积理论出发,以毫微重晶石和商用重晶石作为固体颗粒材料,采用实验室常见的高速搅拌器和高温高压滤失仪作为实验设备,制作模拟页岩地层低渗泥饼。通过改善毫微重晶石的分散稳定性和调整2者质量比等方法,逐步降低泥饼渗透率,最终确定配方为:1 000mL水+100 g毫微重晶石+10 g聚丙烯酰胺+50 g聚丙烯酸钠+200 g商用重晶石+7 g提切剂,按此配方得到的标准泥饼平均厚度为2.24 mm,平均渗透率为1.42×10^(-7) D,稳定性良好,重现性较高。以此法测试了常见页岩气井水基钻井液体系,进一步验证了该方法适用于模拟微孔、缝发育的页岩地层,可有效评价钻井液在该类地层中的滤失造壁性能。To satisfy the need for filtration control performance test with dense low permeability media,a test required for shale gas drilling,a simulated low permeability mud cake formed in shale formation has recently been prepared using barite of millimicron in particle size and commercial barite as solid particle materials,and laboratory high-speed mixer and HTHP filter press as experiment equipment.The permeability of the mud cake was gradually reduced by improving the dispersing stability of the millimicron barite and adjusting the mass ratio of the two barites.The final formulation for making the mud cake was as follows:1,000mL water+100g millimicron barite+10g polyacrylamide+50g sodium polyacrylate+200g commercial barite+7g plugging agent.The mud cake made with this formulation had average thickness of2.24mm,and average permeability of1.42×10-7D.The process of making the mud cake had good stability and repeatability.Using the prepared mud cake,several commonly used water base drilling fluids were tested for their filtration performance,further proving that the mud cake prepared with this method was suitable for use in simulating shale formations with developed micro pores and micro fractures,and in effectively evaluating the filtration and wall building performance of drilling fluids across the shale hole sections.

关 键 词：页岩气井 水基钻井液 滤失造壁性 评价方法 

分 类 号：TE254.1[石油与天然气工程—油气井工程]