东辛油田盐227块致密砂砾岩油藏井工厂开发技术

Study and application on development technique for tight conglomerate reservoir, Yan227 block.

东辛油田盐227块致密砂砾岩油藏前期采用常规方式开采,实施直斜井压裂投产,油井产能和区块采油速度均较低,经济效益差。研究区采用集中钻井、集中压裂、集中投产的集约化建设型井工厂非常规开发模式,强化技术研究及集成应用,针对油藏地质特征及储层性质,开展了井网优化、钻井工程、多级分段压裂以及井筒举升工艺等井工厂开发配套技术研究。在东辛油田盐227块的应用效果较好,平均单井钻井周期仅为87.6 d,压裂施工速度平均为3.5段/d,储量动用率为96.7%,平均单井产液量为26.3 m3/d,产油量为13.7 t/d,含水率为47.8%,明显改善了盐227块致密砂砾岩油藏的开发效果。

The'well factory'is becoming more and more concerned in the development of oil and gas field with its obvious advantagessuch as intensive well layout, small area cover, resources sharing, assembly line production, large-scale mass production, high runtimerate, instant gratification, obvious benefits. The tight conglomerate reservoir in Dongxin Yan227 has adopted the conventional methodsat the early stage. Hydraulic fracturing is used to stimulate the vertical wells and deviated wells. Single well's daily liquid yielding is 3m3/d, daily oil production is 1.2 t/d. The oil well productivity and the block's oil production rate are low, and the economic perfor-mance is poor, as well as the poor development effect. Based on the problems above, the unconventional development method named'well factory'is intensively constructed in recent years. The centralized drilling, fracturing and producing mode is used. Throughstrengthening technology research and integrated application, focusing on the geological characteristics and the reservoir properties, thematching methods such as the well pattern optimization technology, the long well section of horizontal well technology, the optimizeddrilling technology and the multistage fracturing technology with pumping segment bridge plug and other unconventional techniquesare carried on. The block reserve producing rate and single well productivity are greatly increased. This technology improves the devel-opment level of the low permeability conglomerate reservoir significantly, and provides the beneficial reference for the efficient develop-ment to similar reservoirs.