姬塬油田高强度压裂改造工艺技术研究

Strong Fracturing Technology for Jiyuan Oilfield

随着油田开发时间的延长,油井产量下降,低产成为制约姬塬油田提高整体产量的最主要因素。目前在三叠系主力油藏中,C2层和C4+5层重复措施井逐年增多,措施效果变差,C6层和C8层油藏埋藏深、物性差,有效驱替系统难以建立,低产低效井多,常规措施效果不明显。通过对姬塬油田储层物性、地层能量、油水井间连通性及历年措施改造效果进行研究,充分利用部分油藏天然微裂缝发育的特性,采用"大砂量+大排量+高砂比"的压裂改造思路,最终形成了以增大裂缝穿透比、扩大油层泄油面积、改善油藏开发效果为目的的高强度压裂改造技术。2016年该技术现场应用65口井,取得了较好的增产效果。

With the extension of Jiyuan oilfield development time, the production of oil wells was decreasing, and the low productionbecame the main factor restricting the improvement of the whole production. In the main reservoirs of Triassic, the repeatedly imple-menting measures wells in C2 layer and C4＋5 layer are increasing year by year, and the effect of the implementing measures becomespoor; the depth of C6 and C8 reservoirs is large, the physical property of them is poor, the establishment of the effective oil displace-ment system in them is difficult, therefore there are many low-production low-efficiency wells, and the effect of the conventional pro-duction simulation measures is not obvious. Based on the study of the reservoir physical property, formation energy, the connectivitybetween oil and water wells and the effect of the production simulation measures in the past years, a strong fracturing technology isproposed for Jiyuan Oilfield, which can increase the penetration ratio of fractures, expand the oil drainage area of reservoirs and im-prove the development effect of reservoirs by making full use of the natural microfractures in some reservoirs and using ＂large sandcontent＋ large flow rate ＋ high sand ratio＂ fracturing way. The technology was applied on 65 oil wells in 2016, and a good stimulationeffect was achieved.