注水井附加压降的研究与应用

Research and Applicationon Additional Pressure Drop in Water Injection Wells

注水开发油田普遍存在注水井投注后注入压力上升,注水量下降的情况。甚至在最大井口注入压力下,注水量仍无法满足油藏配注需求,导致砂体注采失衡、油田自然递减率加大,最终影响油田开发效果。近年来,渤海A油田通过大量的"微压裂"矿场实验证实,附加压降是导致油田出现欠注问题的根本原因,而酸化解堵过高的措施费用和较短的措施有效期显然无法满足油田高效开发的需求。通过结合油藏工程原理和流体力学理论,对渤海A油田开展了附加压降的研究和定量表征工作,以此修正注水井合理井口注入压力,并成功指导油田经济有效地开展提压增注工作。

In water injection development oilfields, injection pressure rises and water injection volume drops after betting with water injection wells, until the contradiction shows that under the injection pressure of the largest wellhead determined by the overall development plan, the water injection vol ume can not meet the demand for reservoir allocation. Unbalanced mining results in an increase in the natural decline rate of the oil field, ultimately affecting the development of the oil field. In the past, a cidification measures were used to remove plugging and injections, but their operating costs were high and the measures were short lived. The input out and efficiency increase＂. Recently, Bohai A oilfie pu ld t ratio deviated from the concept of ＂cost reduction has confirmed through a large number of ＂micro fracturing＂ mines, the additional pressure drop is the root cause of the problem of oil field＇s inadequacy. It exists obje lem of oil field ctively and cannot be avoided. In order to economically and effectively solve the prob insufficiency, combined with reservoir engineering principle and fluid mechanics theory, the study and quantitative characterization of additional pressure drop have been carried out in Bohai A oilfield, so as to correct the reasonable wellhead injection pressure of water injection wells and successfully guide the oilfield to increase pressure of water injection.