KMK油田稠油水平井增产技术研究

STUDY ON STIMULATION TECHNOLOGY FOR HORIZONTAL WELLS OF HEAVY OIL IN KMK OILFIELD

哈国KMK油田库姆萨伊油藏属于边底水稠油油藏,水平井蒸汽吞吐开采过程中存在油层剖面动用不均、边底水侵入等问题。通过从油藏、注采参数和工艺等方面研究了影响开发效果的主要因素;利用多因素正交试验法研究了各注采参数之间的关联,确定了最佳注采参数;针对边底水侵入的井进行了氮气泡沫调剖技术的研究,2口高含水井由实施前的100%降低至85%,日产油量提高5.1t/d;针对剖面动用不均问题,优化注汽管柱后,水平段温度均匀,周期产油量提高356t,油汽比提高0.11。现场应用表明,实施注采参数优化、氮气泡沫调剖、优化注汽管柱等配套技术后,改善了水平井开发效果,为国内外同类油藏水平井开发提供了借鉴。

There existed some problems of uneven producing profile and invasion of edge and bottom water in horizontal wells with thermal production in KMK Kumsayoilfield, Kazakhstan. The reservoir belongs to the edge and bottom water reservoir, with steam soak. In consideration of reservoir condition, the injection-production parameter and production technology, the main factors that affected the development of horizontal wells were studied.The main control factors influencing the degree of extraction were studied by means of multi-factors orthogonal test, and the optimum injection-production parameters were determined. In order to solve the problem that edge and bottom water invasing in thermal well leads to high water cut in Kumsay oilfield, lab experiments and research on parameters optimization for the profiling technology by using nitrogen foam have been made. After the application of the technology in 2 Wells in Kumsay Oilfield, the water cut decreased from 100% to 85% and the daily oil production increased 5.1t/d. optimization of steam injection casing stung and adjustment steam injection point were adopted to solve the problem of uneven producing profile. After the application of the technology in 3 Wells, the temperature of the horizontal section was uniform, the average oil production increased by 356 t, and the oil vapor ratio increased from 0.21 to 0.32. Application results indicate that through above methods,the producing effect of horizontal wells and the resource utilization in heavy oil reservoirs are improved,and it provides a reference for horizontal well production in similar heavy oil reservoirs.