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在非均质、低渗透砂岩油田水驱开发的中后期 ,剩余油分布具有如下特点 :1注采井网不合理在单砂体中造成有采无注 ,有注无采及注采失调 ,从而形成剩余油。 2砂体单向受效 ,在翼侧形成剩余油。 3砂体非均质严重 ,在高渗透地带造成水窜 ,在低渗透地区形成剩余油。基于剩余油分布的上述特点 ,分析目前开发剩余油所普遍采取的两种方法具有的不足 ,即井网加密受到储量丰度的局限及油田综合调整具有复杂、工作量大、难于管理、成本高 ,使上述剩余油在注水与采油分井进行的开发模式下很难得到充分开发 ,因此提出了开发剩余油、提高非均质低渗透砂岩油田水驱采收率的新思路——同井分层注、采开发模式 ,并以大庆葡萄花油田南部 (葡南 )为例进行了效果预测 ,结果表明 :利用该模式可使葡南油田水驱采收率比标定值提高 3.7%。
In the middle and later stages of the water-flooding development of heterogeneous and low-permeability sandstone oilfields, the remaining oil distribution has the following characteristics: 1 irrational injection and injection well patterns result in non-injection, non-injection and injection failure in a single sand body, Thus forming the remaining oil. 2 The sand body is unidirectional and forms the remaining oil on the wing side. Sand bodies are heterogeneously heterogeneous, causing water channeling in high permeability zones and remaining oil in low-permeability areas. Based on the above characteristics of the remaining oil distribution, it is necessary to analyze the deficiencies of the two commonly adopted methods for developing remaining oil, that is, well confinement is limited by reserves abundance and that oilfield comprehensive adjustment is complex, heavy workload, difficult to manage and high in cost , Making it difficult to fully develop the remaining oil in the development mode of water injection and oil production well division. Therefore, a new idea of developing residual oil and improving water flooding recovery in heterogeneous low permeability sandstone oilfield is proposed Layer injection and development model. The prediction of the effect is made in southern part of Putaohua Oilfield in Daqing. The results show that this model can increase the water flooding recovery of Putnam oilfield by 3.7% over the calibration value.