南堡地区东营组一段储层敏感性评价及油层保护

Susceptivity evaluation and protection countermeasures for the reservoir rocks in the first member of the Dongying Formation in the Nanpu region, Hebei

关键词:  南堡  古近系东营组  储层  敏感性  冀东油田

Key words:  Nanpu region  Dongying Formation  reservoir  susceptivity  East Hebei oil field

摘要:

南堡地区东营组一段辫状河三角洲前缘中孔低渗油气藏的非均质性强。本文采用实验室储层敏感性评价实验程序,针对油田钻井和注水开发实际工作条件,进行了多种储层敏感性测试。实验结果表明:该地区中孔低渗储集层在钻探过程中水敏和盐敏性突出,应针对特定井区的储层渗透性计算泥浆滤液浸入深度,对钻井施工进度提出要求;低渗透层泥浆伤害后,渗透率难以恢复,应减少泥浆浸泡时间,选用高效射孔弹,解除泥浆污染。

Abstract:

The oil reservoirs on the braided delta front slope in the first member of the Dongying Formation in the Nanpu region have the features of moderate porosity and low permeability with strong heterogeneity. In the light of experimental procedures for susceptivity evaluation, a variety of tests are conducted in the laboratory in which the experimental conditions are similar to those in the stages of well drilling and water injection recovery in the oil fields. The results of research indicate that the studied reservoir rocks have both the water and salinity susceptivity.In these cases, the protection countermeasures for the reservoir rocks should be suggested, including the calculation of the depths for the infiltration of the drilling mud so as to arrange suitable progress of drilling construction, and the decrease of soakage periods of mud and adoption of highly effective hole-shooting bullets in order to wipe off mud contamination to the reservoir rocks.