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Buffalo油田位于南达科他州西北,是实施高压注空气(HPAI)项目最早的油田。1977年中期,意识到在一次采油过程中产量迅速递减,经营者实施了一个IOR方案,包括实验室试验、可行性研究和先导性注空气能力试验。1978年9月组建了原来的3.5个区域的Buffalo Red Riv-er单元(BRRU)。1980年将该单元扩大到了9个区域,1981年5月扩大到了12个区域。在BRRUHPAI项目成功的基础上,1983年6月组建了30.5个区域的南Buffalo Red River单元(SBRRU),并且在1985年开始见到注空气效果。此外,在BRRU和SBRRU HPAI项目成功的情况下,组建了7个区域的西Buffalo Red River单元并且于1987年11月开始注空气。总结了3个项目的动态和注空气近30年后经营者获得的所有经验。几乎涉及了开始作业以来全部作业的各个方面;讨论了一般的管理实践、遇到的技术和作业挑战、注入和生产设备以及完井实践;还包括注空气增油量的估算以及如何随着时间改变空气用量。到目前为止,Buffalo油田的3个HPAI项目连续在商业上获得成功。在最近3年,在40多口老垂直井中钻了水平侧向井段以提高产量、有效利用油藏累积能量和提高波及效率。不可能在老垂直井中钻水平注入井段,因为裸眼侧向井段穿过了一个孔隙层,该层会把一些注入空气送入非产层。
Located in the Northwest of South Dakota, the Buffalo field is the earliest field to implement the HPAI project. By mid-1977, realizing that production was declining rapidly during an oil recovery operation, the operator implemented an IOR program that included laboratory tests, feasibility studies, and pilot air injection tests. September 1978 formed the original 3.5 area Buffalo Red Riv-er unit (BRRU). In 1980, the unit was expanded to 9 regions and expanded to 12 regions in May 1981. Building on the success of the BRRUHPAI project, a Southern Buffalo Red River unit (SBRRU) of 30.5 areas was formed in June 1983 and air-injection effects were observed beginning in 1985. In addition, with the success of the BRRU and SBRRU HPAI projects, West Buffalo Red River units in seven districts were formed and air injection started in November 1987. Summarized the dynamics of the three projects and all the experience gained by operators in the past 30 years. Covering almost all aspects of the overall operation since the start of the operation; discussing general management practices, technical and operational challenges encountered, injection and production equipment, and completion practices; including estimating the amount of air injected and how that over time Change the amount of air. To date, three HPAI projects in the Buffalo field have been continuously commercially successful. In the last three years horizontal horizontal wellbores have been drilled in more than 40 old vertical wells to increase production, to effectively harness reservoir accumulation of energy and to increase sweep efficiency. It is not possible to drill a horizontal injection well section in an old vertical well because the openhole lateral well section passes through an aperture layer that will send some of the injected air into the non-pay zone.