缅甸PATOLON-2复杂气井固井技术

Cementing techiniques for gas well PATOLON-2 in Myanmar

吴洪波 刘振通 周坚 钟福海 夏增德 程春红

WU Hongbo LIU Zhentong ZHOU Jian ZHONG Fuhai XIA Zengde CHENG Chunhong

渤海钻探工程有限公司第一固井公司，河北任丘　062552 渤海钻探工程有限公司华北事业部，河北任丘　062552

No.1 Cementing Company, Bohai Drilling and Exploitation Company, Renqiu 062552, China Huabei Branch, Bohai Drilling and Exploitation Company, Renqiu 062552, China

PATOLON-2井在钻井的过程中多次发生钻井液失返性漏失。在边堵漏边钻进时遇高压气层，发生井涌。当压井液密度高于1.30 g/cm3时中上部井段漏失，而压井液密度低于1.42 g/cm3时井下气侵严重，形成了下吐上漏复杂的井下条件。为完成地质测井和?339.7 mm技术套管的固井作业，电测及固井前上部0~1 345 m井段采用密度1.30 g/cm3钻井液，1 345 m ~井底采用密度2.00 g/cm3的钻井液。采取了非常规的正、反注水泥作业，实现了固井过程中的替净、压稳、防漏和防气窜等要求，结合先导钻井液，加重隔离液，微膨胀、防漏、防气窜水泥浆体系和上下双胶塞等固井工艺措施，完成了复杂地质条件下高压气井的固井作业，固井质量优质。该井固井施工的顺利进行，对类似复杂井固井，有一定的参考意义。

Circulation loss has occurred many times during drilling Well PATOLON-2. During the plugging treatment, if high pressure layer is penetrated, gas kick ofen occures. If the mud density is higher than 1.30 g/cm3, circulation loss happens in upper well section, and if the mud density is lower than 1.42 g/cm3, gas kick happens in bottom well section, which is a very complex wellbore condition. To conduct geology logging and cementing the ￠339.7mm technical casing, the mud density for the upper section, 0-1 345 m, was selected as 1.30 g/cm3, and 2.0 g/cm3 was selected for the lower section, 1 345 m to bottem. Drillpipe injection and annlar injection were taken to inject cement and it satisfied with the need of clean wellbore, stable pressure, no leakage, no gas crossflow during cementing. The high pressure gas well cementing operation was completed with high quality, combined with pilot slurry, weighted spacer, slurry with the characters of microswelling, and loss and gas crossflow preventing, and double plugs. The success of the well cementing work supplies a reference for similar complex well cementing.