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水平井沿筒流量的不均匀分布导致驱替过程中水/气锥进、水/气早期突破。对于注入井来说,沿着水平井筒的注入流量剖面造成波及效率低并且未波及到的油层面积大。在本项研究工作中,提出了在防砂和不防砂情况下调整整个水平井沿筒的流量分布。均匀的流量剖面是由沿着衬管或防砂装置上的间隔不均匀割缝或孔眼造成的。所建立的用于水平井内和周围流动的解析模型把井内和该井周围油层内的流动联系了起来,并提供了适用于沿着注入/采油水平井筒衬管或筛管的割缝/孔眼的显性方程式。在巴西陆上和海上一些油田成功地应用了这一技术。在这些油田水平采油井中下入了带有孔眼或割缝的衬管,目的是使沿着水平采油井或注入井筒的流量更为均匀,以便延缓气和水锥进和提高波及效率。解析模型计算得出了多种割缝/孔眼密度,并且在一些井中采用了这些计算选择方案。
Inhomogeneous distribution of horizontal well along the cylinder leads to water / gas coning and water / gas breakthrough in the displacement process. For injection wells, the injection flow profile along the horizontal wellbore creates an inefficient and un-spread reservoir area. In this research work, we propose to adjust the flow distribution of the entire horizontal well along the barrel under the condition of sand control and sand control. Uniform flow profiles are caused by non-uniform gaps or perforations along the liner or sand control device. The established analytical model for the flow in and around the horizontal well correlates the well with the flow within the reservoir around the well and provides a well suited for kerfing / perforations along an injection / recovery horizontal wellbore liner or screen Explicit equation. This technology has been successfully applied in some fields onshore and offshore in Brazil. Lining or kerf linerings are drilled into these oilfield horizontal wells to provide a more uniform flow along horizontal or injection wells to retard gas and water coning and improve sweep efficiency. A number of kerfs / perforations were calculated from the analytical model and these computational options were used in some wells.