Method for Evaluation of Plugging of Nano-micron Fractures
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摘要: 硬脆性泥页岩井壁失稳问题是致密油气等非常规资源钻井过程中的常见难题,目前普遍认为增强对泥页岩微纳米裂缝的封堵,是减少井下复杂的关键。选用一种孔径与泥页岩的微裂缝比较匹配的新型混合纤维素滤膜,替代滤纸做滤失实验,通过对比瞬时滤失量大小,评价了单一处理剂溶液对滤膜的封堵效果。利用该方法进行评价,优选出微纳米粒径的石灰石和二氧化硅复配使用,辅以聚胺、铝合物等抑制封堵剂,构建了一种无黏土相微纳米强封堵钻井液。评价结果表明,该体系在较低表观黏度下,具有较高的动塑比和φ6、φ3读数,有利于水平井井眼净化;具有较低的滤失量,岩屑滚动回收率接近100%,封堵能力远高于常规聚合物体系,可用于致密油气、页岩气等非常规能源的钻进。Abstract: Borehole wall destabilization in unconventional oil and gas drilling has been a problem frequently encountered, and it is widely agreed that plugging of the nano-micron fractures in shale is key to the solution of the problem.A new compound cellulosic filter membrane was chosen to do filtration test.This membrane has pore sizes that are compatible with the sizes of fractures found in shales.By comparing of spurt losses of different additives, the plugging effect of these additives on the membrane can be examined.Using this method, limestone of nano-micron particle sizes and silica of the same size distribution are selected and compounded, producing a clay-free drilling fluid with strong plugging capacity.Polyamine and aluminum compound are also introduced into the drilling fluid to render it inhibitive capacity.At low apparent viscosity, this drilling fluid has high YP/PV ratios, and high φ6, φ3 readings.These characteristics are advantageous to hole cleaning.The drilling fluid has low filter loss and high percent cutting recovery(almost 100%).It has plugging capacity much higher than that of the conventional polymer drilling fluids, and is suitable for use in tight oil and gas drilling and shale gas drilling.
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石秉忠, 夏柏如, 林永学, 等. 硬脆性泥页岩水化裂缝发展的CT成像与机理[J]. 石油学报, 2012, 33(1):137-142. Shi Bingzhong, Xia Bairu, Lin Yongxue, et al. CT imaging and mechanism analysis of crack development by hydration in hard-brittle shale formations[J]. Acta Petrolei Sinica, 2012,33(1):137-142. 王伟吉,邱正松,钟汉毅,等. 页岩储层温敏型P (NIPAm-co-AA)/nano-SiO2复合封堵剂的制备及特性[J]. 石油学报,2015,36(3):378-384. Wang Weiji, Qiu Zhengsong, Zhong Hanyi, et al. Preparation and properties of thermosensitive poly(NIPAmco-AA)/nano-SiO2 composite blocking agent for shale gas reservoir[J]. Acta Petrolei Sinica, 2015,36(3):378-384. 夏鹏,蔡记华,范志军,等. 纳米二氧化硅对盐水钻井液性能的影响[J]. 钻井液与完井液,2015,32(3):9-12. Xia Peng, Cai Jihua, Fan Zhijun, et al. Effect of nano silicon dioxide on the performance of salt water mud[J]. Drilling Fluid & Completion Fluid, 2015,32(3):9-12. 袁野, 蔡记华, 王济君, 等. 纳米二氧化硅改善钻井液滤失性能的实验研究[J]. 石油钻采工艺, 2013, 35(3):30-33. Yuan Ye, Cai Jihua, Wan Jijun, et al. Experimental study on improving filtration propertiesof drilling fluid using silica nano-particles[J]. Oil Drilling & Production Technology, 2013,35(3):30-33. 石秉忠,胡旭辉,高书阳,等. 硬脆性泥页岩微裂缝封堵可视化模拟试验与评价[J]. 石油钻探技术,2014,44(3):32-37. Shi Bingzhong, Hu Xuhui,Gao Shuyang,et al. Visualization sealing simulation test and evaluation of hard brittle shale microfracture[J]. Petroleum Drilling Techniques, 2014,44(3):32-37. 邱正松,王伟吉,董兵强,等. 微纳米封堵技术研究及应用[J],钻井液与完井液,2015,32(2):6-9. Qiu Zhengsong,Wang Weiji,Dong Bingqiang, et al. Investigation and application Micro-nano sealing technolgoy[J]. Drilling Fluid & Completion Fluid, 2015, 32(2):6-9. -

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