新型低固相油基钻井液研制及性能评价
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摘要
为解决常规油基钻井液低温流变性差、低剪切速率下易形成凝胶结构及重晶石沉降等难题,开展了低固相油基钻井液的研究。选用3~#白油为基础油,甲酸铯溶液为密度调节剂,在确定油水比的前提下,对各主处理剂进行优选及加量确定,研制出一种低固相油基钻井液体系,并对其抗温、抗污染、抑制性及储层保护效果等性能进行了评价。评价结果表明,低固相油基钻井液体系具有良好的流变性和触变性,抗温达220℃,抗水污染20%,抗钻屑污染25%,滚动回收率98.7%,渗透率恢复值90%以上。分析认为,低固相油基钻井液体系不仅能够代替常规油基钻井液应用到强水敏地层及复杂结构井,在裂缝性碳酸盐及低孔低渗储层也具有良好的应用前景。
The conventional oil-based drilling fluid has many problems, such as poor rheology, being easy to form strong gel structure at low shear rate and barite settlement. In order to solve these puzzles, a low-solid oil-based drilling fluid technology was carried out. With 3~# white oil as base oil, cesium formate solution as density modifier, reasonable oil/water ratio, main treatment agents optimization and added amount, a low-solid oil-based drilling fluid system was developed. The temperature resistance,contamination resistance, inhibition and formation protection were evaluated. The novel mud has good rheology, thixotropic,temperature resistance(up to 220 ℃), strong inhibition(98.7% scroll recovery) and excellent contamination resistance(20% water tolerance and 25% cuttings tolerance), and it can also effectively protect reservoir and achieve more than 90% of permeability recovery. Analysis shows that the new mud system not only can be applied to strong water sensitive formation and complex structure wells instead of conventional oil-based drilling fluid, but also has good prospect in fractured carbonate and low porosity and permeability reservoirs.
The conventional oil-based drilling fluid has many problems, such as poor rheology, being easy to form strong gel structure at low shear rate and barite settlement. In order to solve these puzzles, a low-solid oil-based drilling fluid technology was carried out. With 3~# white oil as base oil, cesium formate solution as density modifier, reasonable oil/water ratio, main treatment agents optimization and added amount, a low-solid oil-based drilling fluid system was developed. The temperature resistance,contamination resistance, inhibition and formation protection were evaluated. The novel mud has good rheology, thixotropic,temperature resistance(up to 220 ℃), strong inhibition(98.7% scroll recovery) and excellent contamination resistance(20% water tolerance and 25% cuttings tolerance), and it can also effectively protect reservoir and achieve more than 90% of permeability recovery. Analysis shows that the new mud system not only can be applied to strong water sensitive formation and complex structure wells instead of conventional oil-based drilling fluid, but also has good prospect in fractured carbonate and low porosity and permeability reservoirs.
引文
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[12]张斌,杜小勇,杨进,等.无固相弱凝胶钻井液技术[J].钻井液与完井液,2005,22(5):35-37.
[13]马喜平,许帅,王晓磊,等.低压气藏用低密度无固相泡沫修井液的研制及试验[J].石油钻探技术,2015,43(5):100-105.
[2]王中华.国内外油基钻井液研究与应用进展[J].断块油气田,2011,18(4):533-537.
[3]中国石油化工集团公司石油化工科学研究院.原油和石油产品密度测定法(U形振动管法):SH/T 0604—2000[S].北京:中国标准出版社,2000.
[4]中国国家标准化管理委员会.石油产品运动黏度测定法和动力黏度计算法:GB/T 265—1998[S].北京:中国标准出版社,1988.
[5]鄢捷年.钻井液工艺学[M].东营:石油大学出版社,2001:424-425.
[6]张志财.强抑制有机胺聚磺钻井液体系的研究及应用[J].断块油气田,2016,23(1):109-112.
[7]KIRSNER J,MILLER J,BRACKEN J.Additive for oil-based drilling fluids:US7008907[P].2006-03-07.
[8]高海洋,黄进军,崔茂荣,等.高温下乳状液稳定性的评价方法[J].西南石油学院学报(自然科学版),2001,23(4):57-59.
[9]李丽,曾颖峰,刘伟,等.一种新型水基高效液体润滑剂性能评价及应用[J].断块油气田,2015,22(3):398-401.
[10]DALMAZZONE C,FOLLOTEC A L,AUDIBERT-HAYET A,et al.Development of an optimized formulation for cleaning water injection wells drilled with oil-based systems[R].SPE 107632,2007.
[11]李建成,关键,王晓军,等.苏53区块全油基钻井液的研究与应用[J].石油钻探技术,2014,42(5):62-67.
[12]张斌,杜小勇,杨进,等.无固相弱凝胶钻井液技术[J].钻井液与完井液,2005,22(5):35-37.
[13]马喜平,许帅,王晓磊,等.低压气藏用低密度无固相泡沫修井液的研制及试验[J].石油钻探技术,2015,43(5):100-105.