延长油田西部地区低压易漏地层固井技术

发布时间：2019-07-04 09:09

【摘要】：延长油田西部地区存在漏失层,固井过程中水泥浆易发生漏失失返,导致固井质量较差。为此,在分析该地区水平井固井技术难点的基础上,优选复合粉煤灰低密度水泥浆、堵漏前置液配方和套管扶正器类型,优化套管扶正器安放位置,制定提高顶替效率的技术措施,形成了适用于延长油田西部地区的低压易漏地层固井技术。室内试验结果表明:复合粉煤灰低密度水泥浆综合性能良好,API滤失量小于50mL,在低温下水泥石48h抗压强度达到12 MPa以上,沉降稳定性好,上下密度差小于0.03kg/L;前置液加入复合纤维封堵材料能封堵易漏层,提高其承压能力。低压易漏地层固井技术在延长油田西部地区已应用10余井次,固井成功率100%,固井质量合格率达90%,漏失率降至3%。研究表明,低压易漏地层固井技术能解决延长油田西部地区固井中存在的漏失问题,达到提高固井质量的目的。
[Abstract]:There are leakage layers in the western part of Yanchang Oilfield, and the cement slurry is easy to leak and return in the process of cementing, which leads to poor cementing quality. Therefore, on the basis of analyzing the technical difficulties of horizontal well cementing in this area, the composite fly ash low density cement slurry, the formula of plugging front liquid and the type of casing centralizer are optimized, the placement position of casing centralizer is optimized, and the technical measures to improve the replacement efficiency are worked out, which forms the low pressure and easy leakage formation cementing technology suitable for the western part of Yanchang Oilfield. The results of laboratory test show that the comprehensive performance of composite fly ash low density cement slurry is good, the filtration amount of API is less than 50 mL, the compressive strength of cement paste is more than 12 MPa at low temperature for 48 h, the settlement stability is good, and the density difference between upper and lower is less than 0.03 kg 路L. The composite fiber sealing material can seal the easy leakage layer and improve its pressure bearing capacity. The cementing technology of low pressure and easy leakage formation has been applied more than 10 times in the western part of Yanchang Oilfield, the success rate of cementing is 100%, the qualified rate of cementing quality is 90%, and the leakage rate is reduced to 3%. The results show that the low pressure and easy leakage formation cementing technology can solve the problem of leakage in the western part of Yanchang Oilfield, and achieve the purpose of improving the cementing quality.
【作者单位】：延长油田股份公司勘探开发技术研究中心;陕西延长石油(集团)有限责任公司研究院;
【基金】：延长石油集团青年基金项目“低成本低密度水泥浆体系研究”(编号:YCSY2017QNJJ-b-07)研究内容
【分类号】：TE256

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