Anti-channeling High Density Cement Slurry Technology for Horizontal Shale Gas Well in Weiyuan
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摘要: 威远地区页岩气井固井存在地层压力高、水泥封固段长、顶底温差大、后期需要进行高能射孔完井和多级压裂作业等特点,这些都对水泥浆性能提出了较高的要求。针对这些问题,采用降失水剂DRF-120L、高温缓凝剂DRH-200L、高温稳定剂DRK-3S、胶乳防窜剂DRT-100L和精铁粉研究出了密度范围为2.20~2.40 g/cm3的高密度防窜水泥浆体系。研究结果表明,该水泥浆体系具有稳定性好(上下密度差为0)、流动性好、无游离液、失水量低(小于50 mL)、弹性模量低(小于7 GPa)、抗压强度适中和防窜能力强(过渡时间均小于10 min,SPN值均为1.47~1.80)等特点,其各项性能指标达到了川南地区页岩气井的固井要求。截至2015年3月底,该体系已在威远地区应用了13口井,截至2015年6月底,在已进行电测的6口井中,4口井优质,2口井合格,固井质量均较好。
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关键词:
- 页岩气水平井 /
- 固井 /
- 胶乳高密度防窜水泥浆 /
- 威远地区
Abstract: High formation pressures, long cementing hole sections, big temperature differences between surface and bottom hole, and high energy perforation and multi-stage fracturing in later period prevail in well cementing jobs in Weiyuan area where shale gas wells have been drilled. A high density anti-channeling cement slurry is developed to solve these problems. The cement slurry is formulated with filter loss reducer DRF-2120L, high temperature retarder DRH-200L, high temperature stabilizer DRK-3S, latex anti-channeling agent DRT-100L and purified iron powder, with the density ranging in 2.20-2.40 g/cm3. This cement slurry has good stability (density difference between the top and the bottom is zero), good mobility, no free water, low filter loss (<50 mL), low elastic modulus (<7 MPa), moderate compressive strength and strong anti-channeling capacity. (transit time <10 min, SPN=1.47-1.80), satisfying the needs for shale gas well cementing in south Sichuan. This cement slurry has been applied on 13 wells in Weiyuan till the end of March, 2015. Till the end of June, 2015, 4 wells of the 6 electric-logged wells have been successfully cemented, and the other two cemented up to scratch. -
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