自生热压裂生热剂用量优化方法

OPTIMIZATION METHODS OF CONCENTRATION OF HEAT-GENERATION AGENTS IN IN-SITU HEAT FRACTURING TREATMENT

刘蜀知 孙艾茵 刘福健 彭轩

西南石油学院, 四川南充 637001 辽河石油勘探局, 辽宁盘锦 124107 西南油气田分公司, 四川遂宁 629000

对于高凝、稠油油井的压裂,为避免注入流体对储层造成冷伤害,可采用自生热压裂液进行施工。自生热压裂液是在常规水基压裂液的基础上,添加一定量的亚硝酸钠、氯化铵和盐酸,当它们混合发生化学反应时,会释放出大量的热量。根据热平衡方程,建立自生热压裂过程中井筒温度场的数学模型,并编制出计算施工期间井底压裂液温度变化的软件,针对1口实际施工井,采用正交设计方法研究分析了影响生热剂用量的各种因素,提出了生热剂用量的优化确定方法。

During fracturing treatment of oil production wells with viscous crude and crude oil of high freezing point,it is suggested to adopt in-situ heat fracturing liquids to avoid the cold damage to formation by injecting cold fluid.In-situ heat fracturing liquids are made based on common water-base fracturing liquids,with some NaNO2,NH4Cl and HCl added into the base fluid.When the additives are mixed and react,much heat will give out.A mathematical model of wellbore temperature profiles during in-situ heat fracturing treatment based on heat-balance equation is established in this paper,and a computing software was developed.Finally based on a case history of Liaohe oilfield,the effect of surface injection temperature,injection rate and concentration of catalytic agent on concentration of heat-generation agents was investigated by means of orthogonalizing design technique,and developed optimization methods on concentration of heat-generation agents in insitu heat fracturing treatment.

10.3969/j.issn.1000-7393.2003.01.015