摘要
介绍了大庆油田已完成的 4个三元复合驱矿场试验情况 ,包括试验区油藏目的油层地质概况 (给出了粘土矿物组成 ) ,井位图和井网结构 ,地层水和配液水基本矿化组成 ,三元复合驱替液组分组成、段塞结构及大小 ,注入概况 ,全区 (以及个别典型井 )采收率提高值以及驱油液及组分在油层内的滞留。这 4个矿场试验是 :中区西部先导性试验 ;杏五中块先导性试验 ;小井距试验区加牺牲剂RH的先导性试验 ;杏二区扩大性试验。在 4个试验区各选1口典型井 ,中部西区加选中心井 ,共 5口井 ,连续测定矿场试验期间这 5口井采出液中碱NaOH、聚合物HPAM、表面活性剂ORS41或B(以及生物表面活性剂RH)的浓度 ,给出相对浓度 (实测浓度与注入浓度之比 )随注入PV数的变化曲线 ,主要关联粘土矿物含量以及驱油液组成、段塞大小 ,讨论了各组分的滞留、曲线峰值及峰位等。结论如下 :①在 3个组分中表面活性剂ORS41(和B)在油层中滞留量最大 ,油层粘土含量越高 ,滞留量越大 ;②生物表面活性剂作为牺牲剂与磺酸盐ORS41复配 ,可以减少ORS41在油层的滞留量 ,减少三元复合驱配方中ORS41的用量 ;③ 3种组分在采出液中出现的顺序 ,先是碱或聚合物 ,二者相对浓度峰位接近 ,表面活性剂的产出滞后。
Four field trial projects on ASP flood completed at Daqing Oil Fields are introduced concisely. For every experimental area the geologic aspects of the aimed stratum/strata (with clay mineral composition presented), the location and the patern arrangement of wells, the basic quality analysis data of the reservoir water and the water for preparing flooding solutions, the composition of the ASP flooding solutions and their slug structure and size, the injection procedure, the enhancement in oil recovery observed over project unit and of particular wells, and the retention of every component of flooding solutions in the reservoirs are presented. The four field trials are pilot at West Central; pilot at Xing 5 Central; pilot at closely spaced well area ;and enlarged trial at Xing 2. On five production wells( one from each project unit plus one, central well, of West Central trial) the concentrations of NaOH, HPAM, Surfactant ORS41 or B, and biosurfactant RH( in one case ) in the produced fluid are continuously determined and the ratios of determined to initially injected concentrations are plotted against the volume of injected fluids ( in PV). The retention of every component in reservoirs (the height and location of maxima) are discussed mainly in conection with the clay content and the flooding solution (composition and slug structure) used. The conclusions are as follows: ① of the 3 components in ASP solutions the largest retention is observed for surfactant ORS41 ( and B) and the higher the clay content the larger its retention in reservoirs; ② the use of biosurfactant RH as sacrificial agent leads to lowering the retention of ORS41 in reservoirs and thus the use level of ORS41 in ASP flooding formulations; ③ alkaline or polymer appears in the produced fluid firstly with maxima located closely and surfactant ORS41 is produced always with a delay.
出处
《油田化学》
CAS
CSCD
北大核心
2001年第4期362-366,共5页
Oilfield Chemistry
基金
"九五"国家重点科技攻关项目三级课题"减少三元体系中化学剂用量研究"(编号 96 12 1 0 6 0 7)部分研究成果
关键词
表面活性剂
碱
聚合物
牺牲剂
滞留
油层
ASP三元复合驱
粘土
矿场试验
大庆油田
Surfactant
Alkaline
Polymer
Sacrificial Agent
Retention
Reservoirs, ASP Flooding Solution
Clay
Field Trials
Daqing Oil Fields
