纤维堵漏水泥浆的室内研究

Laboratory research on use of fiber cement slurry to prevent lost circulation

余婷婷 邓建民 李键 张玉隆

YU Ting-ting DENG Jian-min LI Jian ZHANG Yu-long

西南石油大学石油工程学院, 四川成都 610500 塔里木油田公司勘探事业部, 新疆库尔勒 841000

解决油气井的漏失问题一直是各大油气田关注的课题。常规固井水泥浆不具备堵漏功能,但在加入惰性纤维材料后,由于纤维的堆积和架桥作用,容易在漏失通道中形成网状结构,而水泥浆的常规性能不会发生太大变化,因此可对钻井、固井过程中的漏失进行有效封堵。并且,纤维的加入还能提高水泥石的韧性,确保射孔作业更好地进行。通过改变纤维的加量和长度,研制出了一种纤维堵漏水泥浆体系,并利用水泥堵漏静态模拟仪对孔径分别为1 mm、2 mm、4 mm的孔隙性漏失和裂缝宽度为1 mm和2 mm的裂缝性漏失进行了室内模拟堵漏试验。结果表明,该纤维水泥浆体系的对孔隙性漏失和裂缝性漏失地层均有良好的堵漏效果。纤维堵漏水泥浆作为一种性能优良的堵剂有广泛的发展前景。

All oil and gas fields pay attention to how to solve the problem of leakage of oil and gas wells.The conventional cement slurry of cementing does not have the function of sealing.However,a net structure is easily to be formed in the leakage passageway due to the function of the fiber accumulation and bridging after adding inertia fiber into the conventional cement slurry of cementing.The conventional performance of the cement slurry does not change a lot.Therefore,the fiber cement slurry can block the leakage effectively during drilling and cementing.In addition,the limestone tenacity can be enhanced after being added the fiber,which guarantees the perforating job to carry on well.This article develops a type of fiber cement slurry system of sealing based on changing the volume and the length of the fiber.By applying the static simulation instrument for plugging cement,a lab simulation sealing test is conducted on the porous leakage with its bore diameter being 1 mm,2 mm,and 4 mm respectively and on the fractured leakage with its fracture radius being 1 mm and 2 mm.The result shows that the fiber cement slurry system exerts favorable effect on sealing the formations of porous leakage and fractured leakage.It has broad prospect as a kind of sealing agent of excellent performance.

10.3969/j.issn.1000-7393.2007.04.026