合水地区致密油油藏注水井转采实施效果分析

Analysis of the Implementation Effect of Water Injection Well Conversion in Tight Oil Reservoirs in Heshui Area

致密油是继页岩气之后全球非常规油气勘探开发的又一新热点,被中国石油界广泛关注。研究表明,鄂尔多斯盆地延长组致密油成藏条件良好,主力层系为长6、长7油层组,盆地中部及南部深湖相沉积发育区是最有利的致密油勘探区。合水地区致密油油藏发育,储层物性差,具有显著的低渗、低压、低产特征,近年来通过水平井大规模体积压裂取得了较高的初产,但油井呈现出初产高、递减大、注水不见效、裂缝性见水的突出问题。对合水地区开展了致密油油藏注水井转采措施效果分析和探究,认为有必要对注采响应关系明显、裂缝性含水上升突出、注水长期不见效的井组内注水井实施转采措施,以提高油层动用程度。

Tight oil is another new hot spot in the global unconventional oil and gas exploration and development after shale gas,and it has received extensive attention from the chinese petroleum community.The research results show that the Yanchang Formation tight oil accumulation conditions in the Ordos Basin are good.The main strata are the Chang 6 and Chang 7 oil-bearing groups.The deep lake sedimentary development areas in the central and southern parts of the basin are the most favorable tight oil exploration areas.Tight oil reservoirs in the Heshui area are well-developed,with poor reservoir physical properties,and have significant low permeability,low pressure and low production characteristics.In recent years,large-scale volumetric fracturing of horizontal wells has achieved high initial production,but oil wells have shown high initial production.The prominent problems such as large decline,ineffective water injection,and fractured water breakthrough,this article analyzes and explores the effect of measures based on the conversion of water injection wells in tight oil reservoirs in the Heshui area.The water injection wells in the well group that have risen prominently and have not been effective for a long time shall implement conversion measures to improve the production level of the oil layer.