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杜229块兴隆台油藏为中厚互层状超稠油油藏,单层厚度薄、储层物性好、原油黏度高,已进入蒸汽吞吐末期,综合含水率快速上升,产量递减严重,亟需实施开发方式转换。针对该区块蒸汽吞吐后期的特点,运用开发机理研究、数值模拟研究等方法,论证了超稠油蒸汽驱的可行性,并于2007年规划了7个70m井距“反九点”井组,开展蒸汽驱先导试验。经过8年的探索与实践,先导试验取得成功,井组年产油由转驱前的4.1×104t上升至5×104t左右,油汽比为0.17,采注比为1.09,采出程度达到53.8%,各项指标达到国际先进水平。通过对历史生产资料及监测资料分析研究,初步形成了超稠油蒸汽驱“先连通、再驱替”的驱油机理,掌握了影响生产效果的各项主要因素,总结了汽驱阶段的动态调控理念及方法。该试验的成功实施,突破了超稠油不能实施蒸汽驱的认识禁区。
Du 229 block Xinglongtai reservoir is a medium-thick interbedded super-heavy oil reservoir. The thickness of single layer is thin, reservoir properties are good, the viscosity of crude oil is high, it has entered the end of steam stimulation, the integrated moisture content increases rapidly, Need to implement the development mode conversion. According to the characteristics of the late stage of steam huff and puff, this paper proves the feasibility of ultra-heavy oil steam flooding by means of research on development mechanism and numerical simulation. In 2007, seven 70m well spacing “ Well group, to carry out steam-driven pilot test. After eight years of exploration and practice, the pilot test was successful. The annual production of oil in Well Group increased from 4.1 × 104t before re drive to about 5 × 104t, oil-steam ratio was 0.17, recovery ratio was 1.09, and recovery rate reached 53.8 %, The indicators reached the international advanced level. Through the analysis of historical production data and monitoring data, the oil displacement mechanism of ”super-heavy oil steam flooding“ and ”first connected and then flooding" have been initially formed. The main factors affecting the production efficiency have been mastered. The steam flooding phase The dynamic regulation and control concepts and methods. The successful implementation of this experiment broke through the restricted zone of understanding that super heavy oil can not be implemented by steam flooding.