文23-6J救援井挤水泥技术

Cementing of Relief Well for Well Wen23-6J

文23-6J救援井是华北油田引进英国科学钻井公司(SDI)磁性距离修正技术,对文23-6X井进行封堵的一口救援井,如果文23-6X井封堵成功,就能在文23气藏建一个有效库容7.93×108 m3、工作气量3.9×108 m3的储气库。文23-6X井是2005年的事故井,井内有近2 300 m落鱼,由于长期的浸泡井下情况复杂,虽然SDI的技术先进,到井深2 588 m后,因没有了落鱼,失去了磁性测量目标,仅在钻井过程中5次与文23-6X井相交汇,没有实现全部贯通,在交汇处分8次注73 m3水泥浆进行封堵。为确保文23-6x井的封堵效果,在救援井下套管固井后,第一次选用了定向定面复合射孔技术,应用超细水泥浆体系,对34#和29#砂层进行射孔挤水泥,经过负压37.84 MPa地层测试封堵效果良好,达到了储气库建设标准要求。

The relief well, Wen23-6J, for the Well Wen23-6X is the first relief well drilled with the aid of SDI's magnetic range correction technology, and will greatly help in building a working gas storage of 3.9×108 m3(active storage of 7.93×108 m3). The Well Wen23-6X is an accidental well drilled in 2005, with 2,300 m of fish left in it. Long time of contact of borehole wall with drilling fluid makes it difficult to(even with SDI's advanced technology) detect the well path with no fish in it when drilled to 2,588 m. The newly drilled hole only met with the old hole at five depths during drilling. 73 m3 of cement slurry was injected in 8 times into the hole to the meeting points. To ensure an effective sealing of the hole, a fixed direction–fixed tool face orientation perforation technology was applied the first time after the cementing of the relief well. Ultra-fine cement slurries were squeezed into #34 and #29 sandstones. Negative pressure(37.84 MPa) testing shows that the plugging of the well is successful and gas storage can be built around the relief well.