为了提高海上河流相稠油油藏堵水措施的有效性,结合渤中油田典型储层和流体特点,利用室内实验开展了海上河流相稠油油藏选择性堵水研究。对三种配制堵剂的注入能力、堵水有效期、封堵能力和对低渗层伤害程度等进行了分析评价,结果表明:堵剂A具有最好的注入性能,对低渗透层伤害程度最低;堵剂B具有最佳的封堵性能;堵剂C具有最长的堵水有效期。结合目标油田储层特征及海上平台操作要求,优选堵剂A在渤中25-1南油田E 25井进行了现场试验。该井堵水后最大日增油约35 m3,含水率下降约10%,有效期396 d,累计增油达1.4×104 m3,取得了较好的降水增油效果。

 In order to improve the effectiveness of water plugging in offshore fluvial heavy oil reservoirs, the selective water plugging study of offshore fluvial heavy oil reservoirs was carried out in combination with the typical reservoir and fluid characteristics of Bozhong Oilfield.Laboratory experiments were conducted to compare the performances of three kinds of plugging agents selected and prepared from four aspects: injection capacity, water plugging validity period, plugging capacity and damage degree to low permeability formation.The results show that plugging agent A has the best injection performance and the lowest permeability damage,plugging agent B has the best plugging performance, and plugging agent C has the longest water plugging validity.Combining reservoir characteristics of target oilfield and operation requirements of offshore platform,plugging agent A is selected as the best water plugging system and has been applied in Bozhong Oilfield. After water shutoff, the maximum daily oil increase of is about 35m3, the water cut is reduced by about 10%, the validity period is 13 months,and the cumulative oil increase is 1.4 × 104m3, which has achieved a good effect.