弱碱三元复合驱注入端结垢规律分析  

Analysis on the Scaling Rule of Weak Base ASP Flooding at the Injection End

作　　者：徐春玲[1] 

机构地区：[1]大庆油田有限责任公司第四采油厂

出　　处：《油气田地面工程》2017年第12期67-69,共3页Oil-Gas Field Surface Engineering

摘　　要：弱碱三元复合驱是一项重要的三次采油技术,与水驱相比,使用该技术可使采取率提高20%以上,但Na_2CO_3的加入导致注入端出现结垢现象,影响注入设备的平稳运行和注入方案的有效实施。为此,对配注工艺垢样进行了分析,结果表明,弱碱三元复合驱注入端受注入水质离子组分影响,垢样以碳酸盐垢为主,质量分数>77%,硅铝酸盐垢质量分数≤2%,其中碳酸盐垢中以碳酸钙垢为主,质量分数>50%;受碳酸钡垢密度相对较大和高压二元体系黏度低的影响,高压二元管线中碳酸钡垢沉积速度比碳酸钙垢快,比例相对较高,而三元注入管线中碳酸钡垢比例相对较低。确定低压三元,高压二元配注工艺垢样的化学组分,结合工艺流程分析结垢特点及规律,可为清垢措施的制定提供依据。The weak base ASP flooding,which can enhance oil recovery by 20% compared with wa-ter flooding, is an important tertiary oil recovery technique. But the addition of Na2CO3 leads to the scale phenomenon at the injection end, which affects stable running of injection equipments and effec-tive implementation of the injection scheme.Therefore,scale samples of the process is analyzed.Re-sults show that under the influence of ion component of the injecting water on the weak base ASP flooding, carbonate scale is the main composition of scale samples, with mass fraction of more than 77%,and the mass fraction of silicon aluminum acid salt scale is not more than 2%.Calcium carbonate scale is the main composition of carbonate scale,and its mass fraction is more than 50%.The density of the barium carbonate scale is relatively larger and the viscosity of the high pressure binary system is low , so the deposition speed of barium carbonate scale is faster than that of calcium carbonate scale in the high pressure binary pipeline, and its proportion is higher. However, the proportion of the barium car-bonate scale is lower in the ternary injection pipeline.The chemical composition of scale samples is de-termined for the allocation and injection process named low pressure ternary and high pressure binary. Scale characteristics and rules are analyzed combined with the technological process, which can provide evidences for the formulation of scale removing measures.

关 键 词：弱碱三元复合驱 结垢规律 碳酸钙垢 碳酸钡垢 溶度积 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]