摘要
水锁损害会对油气井产能造成极大的影响,建立一种对水锁损害进行快速预测的方法十分必要。针对低渗砂岩储层发生水锁损害的特点,选取一定数量的低渗砂岩岩心,较系统地评价了在不同的气测渗透率、孔隙度、初始水饱和度以及油水界面张力条件下的水锁损害程度,采用灰关联分析法对低渗砂岩储层的水锁损害进行了评价和预测研究,并编制了相应的计算程序。灰关联分析实际上就是分析参考序列与比较序列间曲线几何形状的接近程度,一般情况,几何形状越接近,关联度就越大,变化趋势就越接近。灰关联分析步骤为,确定比较序列(子序列)和参考序列(母序列);数据规一化处理;求关联系数;求关联度;关联度按大小排序。结果表明,利用该方法评价和预测低渗砂岩储层的水锁损害是可行的,对影响水锁损害的气测渗透率、孔隙度、初始水饱和度和油水界面张力的4种因素权值分配是合理的。经验证,预测结果有较高的符合率。该方法中的数值计算程序均使用Fortran 4.0在FORTRAN POWER STATION环境下编制而成,在实际应用中能较方便地利用该方法预测低渗砂岩储层的水锁损害程度。
It is very necessary to establish a method for fast prediction of water block damage, as it causes negative influences on oil and gas production. The water block damage is investigated by selecting low permeable sand cores of different permeability, porosity, initial water saturation and tension conditions at oil-water interfaces. Evaluation and prediction study is conducted by the method of Gray Association analysis, and calculating programs are edited using Fortran 4. 0 under Fortran Power Station. This method diagnoses the geometric similarity between the reference sequence and comparative sequence, generally, the more similar of the geometric shape, the closer the correlation and the changing tendency. Results show that it is feasible to evaluate and predict water block damage in the low permeable sandstone reservoirs, and the distribution of such weight factors as permeability, porosity, initial water saturation and tension on oil-water interface is resonable.
出处
《钻井液与完井液》
CAS
北大核心
2002年第2期1-5,共5页
Drilling Fluid & Completion Fluid
