碳酸盐岩油藏酸岩反应动力学实验研究  

An Experimental Study on Acid/Rock Reaction Dynamics for Carbonatestone Reservoir Cores

作　　者：张建利 孙忠杰 张泽兰 

机构地区：[1]中国石油吐哈石油勘探开发指挥部钻采工艺研究院,新疆哈密839009

出　　处：《油田化学》2003年第3期216-219,共4页Oilfield Chemistry

摘　　要：叙述了灰岩与盐酸之间的反应及各动力学参数的表达式。针对塔河灰岩油藏 (温度 12 0～ 130℃ )采用的大量前置液酸压裂作业 (裂缝平均温度 90℃ ) ,考察了实验条件的模拟 :使用不同浓度的乏酸模拟同离子效应 ;反应压力大于 7MPa ,以建立真实的固液相反应条件 ;反应温度为 30℃ ,6 0℃ ,90℃ ,12 0℃ ;通过岩盘转速控制酸液Re,以模拟酸液流态。实验仪器为经改进的美国TEMCO公司CRS 10型酸岩反应动力学实验仪 ;实验用油藏岩心孔隙度0 .1%～ 4 .8% ,渗透率 0 .1× 10 -3 ～ 2 5 2× 10 -3 μm2 ,含CaCO3 ～ 98% ;酸液为含 2 0 %HCl的配方凝胶酸 ;酸岩反应速率由岩盘失重数据计算。重点报道了一个岩心的酸岩反应动力学参数 :在 90℃ ,5 0 0r/min ,Re=12 .87条件下 ,由不同酸浓度下的反应速率J求得反应级数m =0 .4 86 3,反应速率常数K =7.82 0× 10 -6(mol/L) -m·(mol/cm2 ·s) ;在 90℃下随Re增大 ,J出现最大值而有效H+ 传质系数De 趋于下降 ;由 4个温度下 5 0 0r/min ,Re=12 .87条件下求得的J值求出反应活化能Ea=11.398kJ/mol,频率因子K0 =8.343× 10 -4。给出了 12井层岩心的酸岩反应动力学参数值范围。图 2表 3参 3。The reaction between CaCO 3 and hydrochloric acid and the expressions of dynamical parameters are presented. Considering into account the acid fracturing operations with large pad fluid volume developed for the carbonatestone reservoir in Tahe (reservoir temperatures 120-130℃, medium temperature in fractures 90℃), the simulation experiments are conducted under following conditions: spent acid of varying concentration being used to create similar ions effects; reaction pressure >7 MPa for real solid liquid reactions to proceed; reaction temperature of 30℃, 60℃, 90℃, and 120℃; Re of acid adjusted by varying rotating speed to simulate the acid flow patern. The cores used have porosity 0.1-4.8% and permeability 0.1×10 -3 -252×10 -3 μm 2 and contain ～98% CaCO 3; the acid used is a formulated gelled acid containing 20% HCl; the simulation experiments are conducted on TEMCO′s CRS 10 acid/rock reaction dynamics instrument with some improvements; the reaction rates are determined from core disc weight loss data. The dynamical parameters of acid/rock reaction are presented in detail for one core: the reaction order, m , calculated from the data of reaction rate, J , for varying acid concentration at 30℃ and 500 r/min, or Re =12.87, is of 0.486 3 and the reaction rate constant, K , -7.820×10 6 (mol/L) -m ·(mol/cm 2·s); the J curves goes through a maximum and the effective H + mass transfer coeficient, D e, decreases with increasing Re at 90℃; the reaction activation energy, E a, determined from the data of J values at 4 different temperature and at 500 r/min, or Re= 12.87, is of 11.398 kJ/mol and the frequency factor, K 0 - 8.343×10 -4 . For reservoir cores of 12 wells (strata) the range of these dynamical parameters obtained is given.

关 键 词：碳酸盐岩油藏 酸岩反应 动力学 实验研究 储层岩心 塔河油田 酸压裂 胶凝盐酸 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程] TE344