Study and Application of a Tough Anti-Channeling Cement Slurry for Well Xingtan-1
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摘要: 星探1井是吉林油田部署在长春双阳区境内的一口深层水平井，完钻井深为5758 m，水平段长为2015 m。针对该井漏失问题以及后期大型压裂对水泥环抗冲击能力要求比较高的难题开展研究，研发了具有“核-壳”结构的增韧防窜剂TA-1，基于此形成了韧性防窜水泥浆体系。TA-1具有弹性内核与柔性支链，能发挥增韧、成膜、与水化产物形成级配的作用。水泥浆性能测试结果表明，浆体稳定性好，稠化时间在150～350 min可调；SPN值达1.15，表现出较好的防窜能力；TA-1能降低水泥石弹性模量达29.5%，抗冲击能力提升16.4%，同时24 h强度大于20 MPa。韧性防窜水泥浆体系在星探1井固井中得到成功应用，解决了固井层内油气窜通和后期压裂水泥石易开裂等难题。Abstract: The well Xingtan-1 is a deep horizontal well drilled in the Shuangyang district of Changchun city by the Jilin Oilfield. This well has a total depth of 5,758 m and horizontal section of 2,015 m. Studies were conducted on two problems, which are mud losses and strict requirement for the impact resistance of the cement sheath to withstand the effects of large scale fracturing jobs. A toughness enhancing anti-channeling agent TA-1 is developed. TA-1 is a product with “core-shell” structure, and is used to formulate an anti-channeling cement slurry with good toughness. The molecules of TA-1 have elastic cores and flexible molecular chains, and are able to improve the toughness of the cement slurry and form films. Test results of the performance of the cement slurry show that the slurry has good stability, with thickening time adjustable between 150 min and 350 min. The SPN value of the cement slurry is 1.15, indicating the cement slurry has good anti-channeling capacity. TA-1 reduces the elastic modulus of the set cement by 29.5% and enhances the impact resistance of the set cement by 16.4%. A cement slurry treated with TA-1 has 24-hour strength of greater than 20 MPa. Well cementing with this anti-channeling cement slurry on the well Xingtan-1 is successful, helping solve the problems of gas channeling through the cement sheaths and cracking of set cement during fracturing operation.
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Key words:
- Cement slurry /
- Anti-channeling /
- Toughness /
- Mechanical property /
- Well cementing /
- Well Xingtan-1
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表 1 增韧防窜剂加量对水泥浆性能的影响
TA-1/
%流动度/
cmFLAPI/
mLt30 Bc/
mint100 Bc/
mint过渡/
minSPN 2 25 87 173 183 10 5.95 4 24 63 173 181 8 3.45 6 23 42 174 178 4 1.15 8 21 42 172 176 4 1.16 注：未加增韧防窜剂的水泥浆流动度为25 cm；TA-1加量为2%～8%的水泥浆上下密度差均为0。 
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表 2 增韧防窜剂加量对水泥石力学特性的影响
TA-1/
%峰值抗压强度/
MPa弹性模量/
GPa0 65.02 8.97 2 60.01 8.34 4 56.74 8.09 6 52.42 7.84 8 49.01 7.53
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表 3 韧性防窜水泥浆与常规降失水体系水泥浆力学性能对比
水泥浆 抗压强度/
MPa弹性模量/
GPa抗拉强度/
MPa抗折强度/
MPa常规降失水体系 29 7.8 2.0 3.6 韧性防窜体系 24 5.5 2.4 4.5
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表 4 星探1井基础数据
关键参数 数据 关键参数 数据 油气层顶界/m 3080 套管下深/m 5756 油气层底界/m 5703 完钻井深/m 5758 阻流环位置/m 5723 技套下深/m 2640 水泥返高/m 2440（进技套200 m） 两凝界面/m 3000
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