【作者】 于涛；

【导师】 施尚明； 张方礼；

【作者基本信息】 大庆石油大学 ， 地质工程， 2006， 硕士

【摘要】 锦16块是辽河油田整装注水开发主力断块,经过近30年的开发,目前已进入高含水、高采出程度“双高”开发递减阶段,采油速度仅为0.63%,已接近水驱开发枯竭油藏。因此,通过转换开发方式、开展三次采油技术研究以进一步提高采收率势在必行。目前聚合物驱油技术业已成熟,如大庆油田聚合物驱年产量占总年产量的20%。但由于聚合物的成本较高,开展低成本三次采油技术研究,以获得最大经济效益具有极其重要的现实意义。因此,本次选择锦16块(西)三个井组,开展低成本三次采油技术——弱凝胶活性水调驱技术研究,目的是在提高试验井组采收率、获得经济效益的同时,也为锦16块全区以及进入双高开发阶段后期其它断块进行三次采油试验推广提供技术储备。该研究通过开展试验区油藏描述研究,为低成本三次采油技术研究建立了可靠三维地质模型;通过开展试验区注水开发效果评价研究,深入研究水驱开发特点,摸清油气水运动规律,为三次采油研究提供了依据;通过开展高含水期剩余油分布规律研究,寻找剩余油饱和度相对较高地区,为试验方案优选提供了物质基础;通过开展三次采油室内实验研究,确定了试验最佳配方体系:凝胶调剖体系为0.1%HQ+0.05%(AC+JB+LA),驱油体系为0.6%NaOH+0.2QYJ-7,通过弱凝胶活性水调驱提高驱油效率12.78%;通过开展油藏工程研究,对三次采油试验进行部署,设计注剂井3口,中心受效井2口,外围观察井6口,注水井2口,可控制含油面积0.48km2,地质储量208×104t;应用三次采油数值模拟软件,预测了最佳试验方案开发效果,并进行了经济评价,为试验决策提供了科学依据:弱凝胶活性水调驱比水驱提高采收率7.9%,增加可采储量16.4×104t,投入产出比为1∶3。更多还原

【Abstract】 Over nearly 30 years of exploitation , Jin-16 block, the main totally water flooding fault block reservoir in Liaohe oilfield, now has been situated in development-decreasing condition characterized by high water cut and high recovery percent of reserves, approaching a water flooding depletion-type reservoir with only 0.63% of recovery rate. Therefore, it is imperative to enhance oil recovery by way of the transforming of development regime and the investigation of tertiary oil recovery. Nowadays polymers flooding technology has matured, for example, each year the oil production from polymer flooding accounts for 20% of the total production in Daqing oilfield. But for its high cost, it is practically important to carry out the investigation on tertiary oil recovery in order to achieve the maximum economic benefit .Thus ,three well groups were selected for investigation on low cost tertiary oil recovery, that is weak gel activated water profile controlling and flooding ,aiming to economically improve oil recovery of the in-test well groups, furthermore , to supply technical reserves for the whole Jin-16 block and others fault blocks where tertiary oil recovery may spread .In this research, an accurate 3D geological model is established for the investigation of low cost tertiary recovery through the reservoir description of the pilot test zone. The evidence for tertiary recovery in the pilot test is strengthened by means of evaluation on water flood effect and through thorough study of the water flooding character and the flowing behavior of the oil-water-gas system; The optical pilot test design is provided basically on the residual oil distribution during high water cut period and relatively high residual oil saturation zone; The best formula system for the pilot test is determined by way of indoor tertiary recovery experiments:‘0.1%HQ + 0.05%(AC + JB + LA)’for gel profile controlling and‘0.6%NaOH+0.2QYJ-7’for flooding system , resulting additional 12.85% of oil displacement efficiency. Using reservoir engineering methods the tertiary recovery test zone is arranged: 3 chemical reagent injection wells,2 central effected wells, and 6 periphery observation wells are devised ,with controlled oil-bearing area of 0.48km2 and petroleum geologic reserve of 208×104t. Also the numerical simulation software is used to predict the development effect of the optical test plan and the economic evaluation performed provides scientific basis for the test decision : weak gel activated water profile controlling and flooding can enhance 7.9% oil recovery than water flooding does and increase recoverable reserves of 16.4×104t with input-out-ratio of 1:3.更多还原