无固相绒囊流体混合固相纤维的重复压裂暂堵技术  

A Technique of Temporary Blocking for Re-fracturing that Combines Non-solid Phase Fuzzy-Ball Fluid and Fibrous Material

作　　者：许洪星 魏攀峰[2] 王祖文 张冕 杨明正 樊晶晶 Xu Hongxing;Wei Panfeng;Wang Zuwen;Zhang Mian;Yang Mingzheng;Fan Jingjing(Downhole Technology Operation Company CNPC Chuanqing Drilling Engineering Co.,Ltd.,Xi＇an Shaanxi 710018,China;College of Petroleum Engineering,China University of Petroleum（Beijing）Beijing 102249,China;Louisiana State University,Baton Rouge,Louisiana State U70808,USA;Lihui Lab Energy Technology Co.,Ltd.,Beijing 102200,China)

机构地区：[1]中国石油天然气集团川庆钻探工程有限公司长庆井下技术作业公司,陕西西安710000 [2]中国石油大学(北京)石油工程学院,北京102249 [3]路易斯安那州立大学,美国路易斯安那州u70808 [4]河北省化工学会化学封堵材料综合利用研究与应用重点实验室/北京力会澜博能源技术有限公司,北京102200

出　　处：《非常规油气》2018年第4期75-79,共5页Unconventional Oil & Gas

基　　金：国家科技重大专项"大型油气田及煤层气开发--多气合采钻完井技术和储层保护"(2016ZX05066002)资助

摘　　要：加入固相纤维提高封堵承压能力和起效速度是绒囊暂堵剂发展的新尝试。室内以0.1%、0.5%、1.0%浓度将纤维加入密度0.86g/cm3、表观黏度52.5mPa·s、动塑比1.06Pa/(mPa·s)的绒囊流体形成混合暂堵剂,相对绒囊暂堵剂密度变化小于0.01g/cm3、表观黏度变化小于0.50mPa·s、动塑比变化小于0.02Pa/(mPa·s),两者兼容良好。试验评价3种浓度混合暂堵剂在0.50mL/min下连续注入高2 mm、宽30 mm、长600 mm贯穿型裂缝60 min后驱压升至25.14 MPa、26.02 MPa、26.45 MPa,相对纤维单剂提高4.18 MPa、5.06 MPa、5.49 MPa,相对绒囊单剂提高0.29 MPa、1.17 MPa、1.60 MPa。驱压升至20 MPa用时48min、45min、42min,相对纤维单剂下降1min、4min、7min,相对绒囊单剂下降11 min、14 min、17 min。50℃下浓度1.50%绒囊破胶液加入混合暂堵剂15min后密度升至0.98~0.99g/cm3、表观黏度小于4.0~5.0mPa·s、动塑比0.25~0.30Pa/(mPa·s),破胶顺利。现场致密砂岩天然气井SDX井以0.2%加量比混合纤维与绒囊暂堵剂,泵入135m3压裂液造缝后连续注入40m3混合暂堵剂提高裂缝承压能力6.20 MPa,跟进75m3压裂液二次造缝,日产气量达8×104 m3/d,相对邻井提高15%。结果表明,无固相绒囊流体混合纤维后可进一步提高封堵效果。It is a new attempt to add solid phase fibrous materials to increase the plugging capacity and accelerate the plugging process of the fuzzy temporary plugging agent.Experimental investigations were conducted by adding 0.1%,0.5%,1.0%fiber to fuzzy-ball fluid with a density of 0.86 g/cm^3,an apparent viscosity of 52.5 mPa·s and a yield point and plastic viscosity ratio of 1.06 Pa/（mPa·s）to mix as a temporary blocking agent.The corresponding change of the fuzzy-ball fluid density is less than 0.01 g/cm^3,the change of apparent viscosity is less than0.50 mPa·s and the change of yield point and plastic viscosity ratio is less than 0.02 Pa/（mPa·s）.The mixed agents were evaluated experimentally by being continuously injected into fractures with an aperture of 2 mm,a height of 30 mm and a length of 600 mm at a rate of 0.50 mL/min.The injection pressure after 60 min for the three agents with different concentrations was 25.14 MPa,26.02 MPa and 26.45 MPa,respectively.It is 4.18 MPa,5.06 MPa,5.49 MPa higher than pure fibrous agents and 0.29 MPa,1.17 MPa,1.60 MPa higher than pure fuzzy-ball agents.The time duration required for the injection pressure to reach 20 MPa was 48 min,45 min,42 min,respectively.It is a 1 min,4 min,7 min reduction compared with pure fibrous agents and an 11 min,14 min,17 min reduction than pure fuzzyball agents.With the temperature lower than 50 ℃,the density of the 1.50%fuzzy gel breaking agent was 0.98～0.99 g/cm^3 after the addition of the mixed temporary blocking agent and stirring for 15 min,its apparent viscosity was 4.0～5.0 mPa·s and the yield point and plastic viscosity ratio was 0.25～0.30 Pa/（mPa·s）,indicating satisfying gel breaking.Field tests were conducted at tight sandstone gas well SDX with 0.2%fibrous fuzzy-ball mixed agent.40 m^3 mixed agent was injected after fracturing with 135 m^3 fracturing fluid and the pressure-bearing capacity was increased by 6.20 MPa.It was followed by secondary fracturing with 75 m^3 fracturing fluid.The gas daily production rate wa

关 键 词：压裂 重复压裂 绒囊流体 纤维 承压 暂堵 

分 类 号：TE122[石油与天然气工程—油气勘探]