低孔低渗稠油油藏注水增能效果影响因素

doi:10.7657/XJPG20230312

摘要/Abstract

摘要：

吐哈盆地鲁克沁油田二叠系发育低孔低渗砂砾岩稠油油藏，由于储集层物性差，非均质性强，自然产能低，压裂投产后，注水开发效果较差。为了解决平面矛盾突出、见效率低、欠注区域不见效的开发矛盾，实施注水增能提高单井产量，但单井增产效果差异较大。为此，通过室内物理模拟实验，对储集层润湿性和注水增能过程进行了研究。结果表明，吐哈盆地鲁克沁油田二叠系储集层具亲水性，压裂有利于裂缝与储集层基质发生渗吸作用，可有效补充地层能量，从而提高单井产量；注入速度越快，地层能量恢复越快；焖井压力越高，增油量越高。通过数值模拟，并结合现场情况，优化注入参数，注水增能效果较好，措施有效率达88%。

关键词: 吐哈盆地, 鲁克沁油田, 二叠系, 低孔低渗, 砂砾岩, 稠油油藏, 注水增能, 影响因素

Abstract:

Low porosity and low permeability sandy conglomerate heavy oil reservoirs in the Permian series of the Lukeqin oilfield in Turpan-Hami basin are usually fractured for recovery due to their poor physical properties, strong heterogeneity and low natural productivity. The induced fractures and reservoir heterogeneity lead to poor water injection effect. In order to solve the problems encountered in the development such as prominent areal contradiction, low efficiency, and ineffective areas, water injection is used to replenish the formation energy for increasing single-well production, but the effect in single wells is quite different. The reservoir wettability and water injection process for energy replenishment were studied through physical simulation experiments. The results show that the Permian reservoirs in the Lukeqin oilfield are water-wetting. Fracturing is conducive to the imbibition between fractures and reservoir matrix, which can effectively replenish the formation energy to improve single-well production. The faster the water is injected, the faster the formation energy can be recovered; the higher the well soaking pressure, the higher the oil increment. Combining numerical simulation and in-situ conditions, the injection parameters were optimized. As a result, the effect of water injection was good, with the effective rate reaching 88%.

Key words: Turpan-Hami basin, Lukeqin oilfield, Permian, low porosity and low permeability, sandy conglomerate, heavy oil reservoir, water injection for energy replenishment, influencing factor

中图分类号:

TE341

万海乔, 王盛, 刘学良. 低孔低渗稠油油藏注水增能效果影响因素[J]. 新疆石油地质, 2023, 44(3): 347-351.

WAN Haiqiao, WANG Sheng, LIU Xueliang. Factors Influencing Water Injection Effect in Low Porosity and Low Permeability Heavy Oil Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(3): 347-351.

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