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Remaining Oil Distribution Law and Potential Tapping Strategy of Horizontal Well Pattern in Narrow Oil Rim Reservoir with Gas Cap and Edge Water

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Document pages: 10 pages

Abstract: For thin oil rim reservoir with gas cap and edge water, it ishelpful to improve the development effect to find out the distribution law ofremaining oil in this kind of reservoirs. For this reason, taking the narrowoil rim reservoir with gas cap and edge water of Oilfield A in Bohai Sea as acase, the main controlling factors, including reservoir structure, fault, gascap energy, edge water energy and well pattern, affecting the distribution ofresidual oil in this kind of reservoir were analyzed by using the data of core,logging, paleogeomorphology and production.Then, the distribution law of remaining oil was summarized. Generally, theremaining oil distribution is mainly potato-shaped or strip-shaped inplane. Vertically, it depends on the energy of gas cap and edge water. For thereservoir with big gas gap and weak edge water, the remaining oil mainly liesin the bottom of oil column. And for the reservoir with small gas gap andstrong edge water, the remaining oil mainly locates at the top of oil column.Aiming at different distribution modes of remaining oil, the corresponding potentialtapping strategies of horizontal wells are put forward: in the late stage ofdevelopment, for the reservoir with big gas gap and weak edge water, the remainingoil concentrates at the bottom of the oil column, and the position ofhorizontal well should be placed at the lower 1 3 to the lower 1 5 of the oilcolumn; for the reservoir with small gas cap and strong edge water, the remainingoil locates at the top of the oil column, and the position of horizontal wellshould be put at the upper 1 5 to the upper 1 3 of the oil column height,vertically. Based on the study on remaining oil of Oilfield A, a potential tappingstrategy of well pattern thickening and vertical position optimization ofhorizontal well was proposed. This strategy guided the efficient implementationof the comprehensive adjustment plan of the oilfield. Moreover, 18 infilldevelopment wells were implemented in Oilfield A, and the average production ofthe infill wells is 2.1 times that of the surrounding old wells. It isestimated that the ultimate recovery factor of the oilfield will reach 33.9 ,which is 2.3 higher than that before infilling wells. This study can be usedfor reference in the development of similar reservoirs.

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