辽河油田稠油油藏筛管完井水平井分段化学堵水技术

目前由于边底水侵入等原因造成辽河油田部分稠油油藏筛管完井水平井高含水生产,严重影响产能,为此,进行了分段化学堵水技术研究。研制了水平井可捞式桥塞、水平井耐高温堵剂、水平井液体桥塞等关键工具及堵水材料,形成了水平井分段化学堵水技术,实现对水平段任意一点精确堵水,堵水精度可达2 m。该技术自2010年以来在辽河油田新海27块、杜84块、高246块、冷41块等区块累计现场应用19井次,截至2014年4月,累计增油8173 t,累计降水9.69×104 m3,试验效果良好。现场试验表明,水平井分段化学堵水技术能够满足水平井堵水要求,具有较大的推广应用价值,目前水平井分段化学堵水有效期一般为8个月左右,下一步在如何提高堵水有效期方面仍需攻关研究。

Staged chemical water plugging for horizontal wells with screen completions for heavy oil reservoirs in Liaohe Oilfield

At present, due to invasion of edge water and bottom water, some horizontal wells with screen completion for heavy oil reservoirs in Liaohe Oilfield are producing with high watercut, which severely affects their productivity; for this reason, research on staged chemical water plugging technique has been conducted, and key tools and water plugging materials have been developed like fishable bridge plug in horizontal wells, high temperature resistance plugging agent for horizontal wells, liquid plug for horizontal wells, etc., and the staged chemical water plugging for horizontal wells has been developed, which can realize accurate water plugging at any point in horizontal section, and water plugging accuracy can be up to 2 m. This technique has been used for 19 well-times since 2010 on such blocks as Xinhai Block 27, Du Block 84, Gao Block 246 and Leng Block 41 in Liaohe Oilfield. By April of 2014, accumulated increase in oil production was 8 173 t and water reduction was 9.69×104 m3, so the tests were proved very effective. Field tests show that staged chemical water plugging technique for horizontal wells can meet the requirement of water plugging in horizontal wells and has significant promotion and application value. At present, the effective period of staged chemical water plugging is about 8 months in general, so how to improve the effective period of water plugging remains to be tackled in further research.