低渗致密砂岩气田储层损害评价及保护措施

储层孔隙类型、孔隙结构、粘土矿物类型和含量等是造成气层受伤害的潜在因素 ,而外来固相、滤液以及生产或作业压差、生产时间等工程因素也可造成或加重对气层的伤害程度 ,因此 ,低渗致密气田 (藏 )的开发效果在很大程度上依赖于开发技术水平的提高。应用岩心评价实验、时间推移测井、生产测井以及试井等方法 ,评价了河南东濮凹陷白庙、文 2 3等气田低渗致密砂岩储层的敏感性及与外来液的配伍性 ,分析了导致或加重对气层造成伤害的工程因素。在气田开发的全过程中 ,有针对性地制定出对气层进行保护的配套措施 ,减少了对储层的伤害 ,充分发挥了气层的潜力 ,提高了气田的开发效果 ,也为同类气田提供了借鉴。

RESERVOIR DAMAGE EVALUATION AND PROTECTION FOR LOW-PERMEABILITY SAND GAS FIELD

Reservoir pore types, pore structures and the types and co ntents of clay minerals are the potential factors which result in formation dama ge. And engineering factors as external solid phase and filtrate, producing or o perating pressure drawdown may also cause or aggravate the damage. The productio n effect of low permeability pools is mostly dependent on the improvement of dev elopment techniques. By using core evaluation test, time-lapse logging, produc tion logging and well test etc., the sensitivity of gas reservoir and its compat ibility with external fluids are evaluated, and the engineering factors causing or aggravating the damage are analyzed in the Baimiao gas field and Wen 23 gas f ield in the Dongpu depression. The proper measures are directly made to protect gas reservoir through out the development of gas field,to decrease the degree o f damage,to make the potential of gas reservoir, to improve the development effe ct, and to provide experience for other similar gas fields.