安83致密油藏定向井能量补充方式

Formation energy supplement methods of directional wells in the tight reservoirs of well An-83 area

安83长7致密油藏定向井前期常规注水开发面临注水不见效，见效即见水，无法形成有效注水驱替，导致地层压力水平保持较低．开发效果较差。近年来，通过对该区实施油水井连片规模体积压裂（注水井也进行转采），解放了储层能力，取得较高产能，但随着开发时间推移，无能量补充矛盾凸显，油井递减较大，导致定向井开发区低产低效。为了进一步探索致密油能量补充方式，通过开展致密油储层再认识、再分析、再研究，总结现场开发规律，利用体积压裂后井网之间基质距离缩小．驱替启动压力变小，以及储层亲水性毛细管吸吮作用和压差机理．结合改造强度、缝网形态等参数情况实施体积压裂后注水和吞吐采油，取得了较好效果，初步探索出了致密油能量补充方式。

There are some problems of no response to the water injection and the water breakthrough follows the response in the early stage of the conventional waterflooding in the directional wells of tight Chang - 7 reservoirs in the well An - 83 area. Effective waterflooding displacement cannot be formed, resulting in a low formation pressure retaining level and poor development effect. In recent years, through the implementation of linked-up large-scale three-dimensional fracturing （SRV） on the oil and water wells in the area （injection wells are converted to producers）, the reservoir capacity has been liberated to achieve higher production capacity. However, with the passage of development time, contradictions of no energy supplement are prominent. The oil production decline is large, leading to low production and low efficiency of the directional well development zone. In order to further explore the way of energy replenishment of the tight oil, through the re-cognition, re-analysis and re-study of the tight oil reservoirs, and summarizing the on-site development law, waterflooding and oil recovery by huff-and-puff after three-dimensional fracturing （SRV） were carried out by utilizing the reducing of the distance of the matrixes in the well pattern and decrease of the displacement starting pressure after the tridimensional fracturing （SRV）, and hydrophilic capillary suction in the reservoirs and differential pressure mechanism, and combined with the parameters such as the stimulation strength and the fracture network configuration. The results are good. The energy supplement modes of tight oil are initially explored.