A Cementing Technology for Horizontal Shale Oil Wells in Shahejie Formation of Shengli Oilfield
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摘要: 胜利油田沙河街组页岩油水平井固井时存在套管居中和安全下入难度大、水泥浆性能要求高和油基钻井液驱替困难等技术难点，为此研发了两亲冲洗隔离液体系、优选纤维膨胀水泥浆体系和塑性胶乳防窜水泥浆体系，并采取应用整体式弹性套管扶正器、偏心导向引鞋、漂浮顶替技术和环空加压等固井技术措施，初步形成了胜利油田沙河街组页岩油水平井固井技术。该固井技术在预探井YYP1井进行了现场试验，固井作业正常，声幅测井结果显示，一界面固井质量为优质，二界面固井质量为合格。研究与试验表明，该固井技术够解决胜利油田沙河街组页岩油水平井长水平段固井存在的技术难点，提高固井质量，满足大规模体积压裂对水泥环胶结质量的要求，可以在页岩油开发中进行推广应用。Abstract: The cementing of horizontal shale oil wells in Shahejie Formation of Shengli Oilfield faces some technical challenges, such as the difficulties in the casing centering and safe casing running, high performance requirements for cement slurry, and hard displacement of oil-base drilling fluids. In light of these, the amphiphilic flushing spacer system was developed , the fiber expanding and anti-channeling plastic latex cement slurry system were optimized. On this basis, a cementing technology was formed preliminarily for horizontal shale oil wells in Shahejie Formation of Shengli Oilfield by combining cementing equipments and measures including an integral elastic casing centralizer, an eccentric guide shoe, floating displacement, and annulus pressurization, etc. The cementing technology was tested on site in a preliminary prospecting well YYP1, with a normal cementing operation completed. The results of acoustic amplitude logging showed that the cementing quality of the first interface was quite high, and that of the second interface was qualified. As indicated by the research and tests, the proposed cementing technology can tackle technological problems in cementing for long horizontal sections of horizontal shale oil wells in Shahejie Formation of Shengli Oilfield and enhance cementing quality. It meets the requirements of large-scale volumetric fracturing for the cementing quality of cement sheaths and can be promoted and applied in the development of shale oil.
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Keywords:
- shale oil /
- horizontal well /
- cementing /
- cement slurry /
- cementing quality /
- Shengli Oilfield
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图 1 水泥浆防漏性能评价装置基本原理
Figure 1. Basic principle of evaluation device for cement slurry lost-circulation-control performance
表 1 两亲冲洗隔离液油膜冲洗效率试验结果
Table 1 Test results of flushing efficiency of oil film by amphiphilic flushing spacer
冲洗时间/min W0/g W1/g W2/g 冲洗效率，% 10 51.20 56.30 51.90 86.27 20 51.20 58.10 51.40 97.10 
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表 2 油基钻井液与两亲冲洗隔离液相容性试验结果
Table 2 Test results of compatibility between oil-base drilling fluid and amphiphilic flushing spacer
混合比例1） 六速旋转黏度计读数 塑性黏度/
（mPa·s）动切力/
Paϕ3 ϕ6 ϕ100 ϕ200 ϕ300 ϕ600 1∶0 7 9 33 52 70 115 45 12.8 1∶1 7 8 22 30 38 58 20 9.2 1∶3 5 7 24 35 43 67 24 9.7 3∶1 9 12 40 57 76 130 54 11.2 注：1）为油基钻井液与两亲冲洗隔离液的体积比。
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表 3 纤维膨胀水泥浆体系和塑性胶乳防窜水泥浆体系的基本性能参数
Table 3 Basic performance parameters of the fiber expanding and anti-channeling plastic latex cement slurry system
水泥浆体系 密度/（kg·L−1） 游离液，% API 滤失量1）/mL 稠化时间2）/min 水泥石膨胀率3），% 上下密度差/（kg·L−1） 纤维膨胀 1.85 0.1 45 306 0.6 0.01 胶乳防窜 1.92 0 15 166 1.2 0 注：1）试验条件为90 ℃×6.9 MPa×30 min；2）试验条件为90 ℃×70.0 MPa×50 min；3）试验条件为90 ℃×0.1 MPa×48 h。
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表 4 水泥石力学性能试验结果
Table 4 Test results of mechanical properties of cement stone
水泥浆体系 密度/
（kg·L−1）抗压强度/MPa 弹性模量/
GPa12 h 24 h 48 h 72 h 纤维膨胀1） 1.85 8.15 21.40 纤维膨胀2） 1.85 6.65 20.75 6.80 胶乳防窜3） 1.92 10.90 19.30 28.60 6.20 注：1）试验条件为0.1 MPa×30 ℃；2）试验条件为0.1 MPa×90 ℃；3）试验条件为30 MPa×124 ℃。
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