低成本超低密度水泥浆体系研究与应用
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摘要
针对低压易漏失、长封固段地层的固井难题,同时适应当前油气勘探低成本战略,开发出一种复合增强材料BCE-650S。该材料具有稳定性好、高活性、高蓄水等特点,且来源广泛、价格低廉。对其辅以适当外加剂,形成了密度在1.20～1.30 g/cm~3的超低密度水泥浆体系。该体系在扩大水灰比、降低密度的同时,还具有优良的性能,使低密度水泥浆的成本大幅降低,水泥浆在60℃养护24 h后的抗压强度大于8 MPa,72 h抗压强度在10 MPa以上;浆体稳定性、耐压性能良好;失水量可控,稠化时间可调,满足施工要求。该体系已经应用于吉林油田,现场固井效果良好,具有推广应用前景。
By compounding a high water demand material, a high active material and an ultra-fine material, a low cost strengthening light weight material BCE-650 S was developed for use in low density cement slurry as a high performance additive. An ultra-low density cement slurry was developed with BCE-650 S and other additives and mixed materials selected for use with BCE-650 S. This cement slurry has densities adjustable between 1.20 g/cm~3 and 1.30 g/cm~3, and liquid/solids ratio between 1.07 and 1.23, and therefore has its cost greatly reduced. Laboratory study showed that the 24-hour compressive strength of the ultra-low density cement slurry at 60 ℃ is greater than 8 MPa, and the 72-hour compressive strength is greater than 10 MPa. The settling stability of the cement slurry is quite good; the difference between the density of the top and the density of the bottom of the cement slurry is only 0.01 g/cm~3. The cement slurry has controllable filter loss, adjustable thickening time and high compressive strength, satisfying the need of field operation. This cement slurry is suitable for cementing low pressure long open hole with mud loss zones. Success in applying the cement slurry in Jilin Oilfield indicates that this cement slurry will have good application prospect.
By compounding a high water demand material, a high active material and an ultra-fine material, a low cost strengthening light weight material BCE-650 S was developed for use in low density cement slurry as a high performance additive. An ultra-low density cement slurry was developed with BCE-650 S and other additives and mixed materials selected for use with BCE-650 S. This cement slurry has densities adjustable between 1.20 g/cm~3 and 1.30 g/cm~3, and liquid/solids ratio between 1.07 and 1.23, and therefore has its cost greatly reduced. Laboratory study showed that the 24-hour compressive strength of the ultra-low density cement slurry at 60 ℃ is greater than 8 MPa, and the 72-hour compressive strength is greater than 10 MPa. The settling stability of the cement slurry is quite good; the difference between the density of the top and the density of the bottom of the cement slurry is only 0.01 g/cm~3. The cement slurry has controllable filter loss, adjustable thickening time and high compressive strength, satisfying the need of field operation. This cement slurry is suitable for cementing low pressure long open hole with mud loss zones. Success in applying the cement slurry in Jilin Oilfield indicates that this cement slurry will have good application prospect.
引文
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[2]周仕明.优质高强低密度水泥浆体系的设计与应用[J].钻井液与完井液,2004,31(6):33-37.ZHOU Shiming.Design and application of premium cement slurry systemwith high strength and low density[J].Drilling Fluid&Completion Fluid,2004,31(6):33-37.
[3]滕兆健,邢秀萍,常燕,等.空心玻璃微珠低密度水泥浆的初步研究[J].钻井液与完井液,2011,28(增刊):23-25.TENG Zhaojian,XING Xiuping,CHANG Yan,et al.Research on hollow glass beads used in low-density cement slurry system[J].Drilling Fluid&Completion Fluid,2011,28(sl):23-25.
[4]沙林浩,李立荣,高永会,等.一种可替代漂珠的低密度材料[J].钻井液与完井液,2006,23(6):55-60.SHA Linhao,LI Lirong,GAO Yonghui,et al.Asubstitute for hollow micro-spheres[J].Drilling Fluid&Completion Fluid,2006,23(6):55-60.
[5]孙富全,侯薇,靳建州,等.超低密度水泥浆体系设计和研究[J].钻井液与完井液,2007,24(3):31-34.SUN Fuquan,HOU Wei,JIN Jianzhou,et al.Design and study of ultralow density cement slurries[J].Drilling Fluid&Completion Fluid,2007,24(3):31-34.
[6]黄柏宗.紧密堆积理论优化的固井材料和工艺体系[J].钻井液与完井液,2001,18(6):1-9.HUANG Bozong.New cementing materials and technique developed on the concept of high packing density[J].Drilling Fluid&Completion Fluid,2001,18(6):1-9.
[7]曾建国,孙富全,高永会,等.高温高性能低密度水泥浆的室内研究[J].钻井液与完井液,2011,28(3):47-49.ZENG Jianguo,SUN Fuquan,GAO Yonghui,et al.Laboratory study of high-temperature resistance and highperformance low-density cement slurry[J].Drilling Fluid&Completion Fluid,2011,28(3):47-49.
[8]刘勇,谢承斌,孙富全,等.低密度高强度水泥浆在哈萨克斯坦油田热采井的应用[J].钻井液与完井液,2010,27(5):68-70.LIU Yong,XIE Chengbin,SUN Fuquan,et al.Application of low-density and high-strength cement slurry in Kazakhstan[J].Drilling Fluid&Completion Fluid,2010,27(5):68-70.
[9]邹建龙,屈建省,吕光明,等.新型固井降失水剂BXF-200L的研制与应用[J].钻井液与完井液,2005,22(2):20-23.ZOU Jianlong,QU Jianxing,LYU Guangming,et al.Anovel fluid loss additive BXF-200L for oilfield cement and its application[J].Drilling Fluid&Completion Fluid,2005,22(2):20-23.
[10]耿建卫.一种低温早强低密度水泥浆[J].钻井液与完井液,2017,34(4):65-68.GENG Jianwei.Study and application of low temperature early strength low density cement slurry[J].Drilling Fluid&Completion Fluid,2017,34(4):65-68