延长油田 X区块低渗油藏经过了 10 年注水开发,目前处于中含水阶段.为了保证研究区能够稳产,通过地质、井网、注水等方面对 X 区块油井见水见效特征进行分析.分析结果表明,研究区见效油井占比达66.3%,油井见效和见水情况整体较好,整体上注水有效驱替已经建立.油井不见效的原因有注采不对应、水淹水窜及无法建立有效的驱替压力系统.见水类型可分为孔隙型见水、裂缝型见水和孔隙裂缝型见水三类.方位和井距不是影响油井见水的主要因素,注水强度偏大、裂缝及高渗层是影响油井见水的主要原因.不见效油井的研究结果对 X区块低渗油藏注水高效开发具有重要的指导作用.
Water Breakthrough Effectiveness of Oil Wells in Low Permeability Reservoir in Block X of Yanchang Oilfield
After 10 years of water injection development,the low permeability reservoir in Block X of Yanchang Oilfield is now in the medium water cut stage.In order to ensure stable production in the study area,this paper analyzes the characteristics of water breakthrough effectiveness of oil wells in Block X through geology,well pattern,water injection and other aspects.The analysis results show that the proportion of effective wells in the study area is 66.3%,the oil wells are effective and the water breakthrough situation is good on the whole,and the effective water injection displacement has been established on the whole.The causes of ineffective oil wells are the mismatch between in-jection and production,water flooding and water channeling,and the inability to establish an effec-tive displacement pressure system.The water breakthrough types can be divided into three types:pore type water breakthrough,fracture type water breakthrough and pore fracture type water break-through.Orientation and well spacing are not the main factors affecting water breakthrough of oil wells,while large water injection intensity,fractures and high permeability layers are the main fac-tors.The research results of ineffective wells play an important role in guiding the efficient develop-ment of low permeability reservoirs in Block X.
water breakthrough effectivenessmainstreameffective displacementineffective rea-sons
万方数据
维普
