皮山北区块超深井高密度固井技术
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摘要
皮山北区块古近系埋藏6 900 m,发育膏岩层和多套高压盐水层,地层压力系数2. 25,井底温度160℃,下开次储层与古近系高压盐水层距离短,前期部署井均因高压盐层难题造成未能准确评价储层,故对高压盐水层有效封隔要求高。通过三级颗粒级配,选用微锰、铁矿粉、还原铁粉组合加重,优化出抗温160℃～180℃,密度2. 55 g/cm~3高密度盐水水泥浆体系。该水泥浆体系具有良好流动性、API失水量小于50 mL,直角稠化、SPN值小于1. 1,水泥石高温强度稳定性好,抗压强度大于20 MPa,沉降稳定性小于0. 02 g/cm~3。同时选用高钢级套管封隔盐水层和膏岩层,采用高密度钻井液大循环实施动态承压,优化隔离液流变性和注替参数,实现隔离液紊流+水泥浆塞流复合顶替,保障了顶替效率,昆仑101井技术应用固井质量达到优秀。
Pishanbei block's Paleogene was buried deep at6 900 m,gypsolyte and high-pressure water layer developed,formation pressure coefficient 2. 25,bottom hole temperature to160℃,and the distance between reservoir and high pressure layer was short. The early exploration failed to accurately evaluate the reservoir because of the high pressure brine layer. So high quality isolation of the high pressure brine layer is demanded. Through 3-level grain scaling,composite weighting by micromax,iron ore powder and iron powder,a set of high density brine cement slurry is developed for 160 ～ 180℃,its density is2. 55 g/cm~3. This cement slurry has good mobility,API filter loss less than 50 m L,right-angle thickening curve,and SPN less than 1. 1. The set cement has high temperature stability,the compressive strength more than 20 MPa,and the settling stability less than 0. 02 g/cm~3. In addition,by high grade casing,high density drilling fluid circulation to realize dynamic pressure loading,optimum spacer fluid rheological properties and pumping parameters to perform compound turbulent and plug flow displacement to improve displacement efficiency,the cementing on Well Kunlun-1 was proved excellent.
Pishanbei block's Paleogene was buried deep at6 900 m,gypsolyte and high-pressure water layer developed,formation pressure coefficient 2. 25,bottom hole temperature to160℃,and the distance between reservoir and high pressure layer was short. The early exploration failed to accurately evaluate the reservoir because of the high pressure brine layer. So high quality isolation of the high pressure brine layer is demanded. Through 3-level grain scaling,composite weighting by micromax,iron ore powder and iron powder,a set of high density brine cement slurry is developed for 160 ～ 180℃,its density is2. 55 g/cm~3. This cement slurry has good mobility,API filter loss less than 50 m L,right-angle thickening curve,and SPN less than 1. 1. The set cement has high temperature stability,the compressive strength more than 20 MPa,and the settling stability less than 0. 02 g/cm~3. In addition,by high grade casing,high density drilling fluid circulation to realize dynamic pressure loading,optimum spacer fluid rheological properties and pumping parameters to perform compound turbulent and plug flow displacement to improve displacement efficiency,the cementing on Well Kunlun-1 was proved excellent.
引文
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[3]张春涛.盐膏层固井技术及应用[J].钻采工艺,2008,31(3):146-148.
[4]王保成.复杂深井固井技术综合应用研究[J].钻采工艺,2013,36(5):44-46,51.
[5]丁世东,塔河油田紊流、塞流复合顶替固井技术[J].石油钻采工艺,2002,24(1):20-22.
[6]王志国,徐碧华,陈超,等.复杂井眼条件下扶正器对套管下入摩阻的影响研究[J].钻采工艺,2014,37(1):27-30.
[7]王其春,周仕明,巢贵业. MS-R高密度隔离液的研究及应用[J].油气地质与采收率,2005,5(12):67-69.
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[9]黄柏宗.紧密堆积理论的微观吉利及模型设计[J].石油钻探技术,2007,35(1):2-12.
[10]徐碧华,刘汝国,刘威,等.超高密度水泥浆加重剂粒径和加量优化模型[J].西南石油大学学报,2008,30(6):131-134.
[11]高元,桑来玉,杨广国,等.胶乳纳米液硅高温防气窜水泥浆体系[J].钻井液与完井液,2016,33(3):67-72.
[12]桑来玉,王其春,赵艳.油井水泥高温缓凝剂DZH-2室内评价与应用[J].钻井液与完井液,2006,23(6):47-49.