曲堤油田结垢机理研究与防治  

Mechanism of Scaling and Prevention Measures in Qu-di Oilfield

作　　者：孙哲[1] 赵兴国[1] 李资收[1] 赵洪涛[1] 袁晓亮 崔晶[1] 孙棋 SUN Zhe,ZHAO Xing-guo,LI Zi-shou,ZHAO Hong-tao,YUAN Xiao-liang,CUI Jing,SUN Qi(Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying 257000, Chin)

机构地区：[1]胜利油田鲁明油气勘探开发有限公司,山东东营257000

出　　处：《装备环境工程》2018年第8期16-20,共5页Equipment Environmental Engineering

摘　　要：目的解决曲堤油田的结垢问题。方法采用离子色谱仪,对水样理化性质进行测试分析,采用X射线衍射仪对现场垢样进行成分分析,通过室内静态结垢实验结合滴定法,研究油井采出液及联合站注入水混合的配伍性,并对阻垢剂进行筛选及评价。结果曲堤油田水样水型均为CaCl_2型,含有较多的结垢性阳离子Mg^(2+),Sr^(2+)和Ba^(2+)的含量相对较少。对于结垢性阴离子,主要为HCO_3^-,CO_3^(2-)和SO_4^(2-)含量较少。曲堤油田结垢主要是由于Ca^(2+)、Mg^(2+)与HCO3-反应,生成白云石晶体造成的。各油井采出液在低温下混输,配伍性较好;随着温度的升高,会出现一定程度的结垢,但结垢率均小于5%。除Q10-X16油井采出液以外,其余各油井采出液与联合站注入水均不配伍,混合后结垢率达10%以上。选择7#阻垢剂,加注浓度50 mg/L作为曲堤油田的阻垢剂类型及加药制度。结论现场调研的7#缓蚀剂对于曲堤油田的环境具有适用性,阻垢率高,能够有效减缓曲堤油田的结垢问题。Objective To solve the scaling problem in Qu-di Oilfield. Methods The physical and chemical properties of the water sample were tested and analyzed with a ion chromatography; the X-ray diffraction instrument was used to analyze the composition of the on-site scale samples; through the indoor static scaling experiment combined with the titration method, the compatibility between the production fluid in the oil well and the injection water from the joint station were studied; and also the scaling inhibitors were filtered and evaluated. Results The type of the water samples in the Qu-di Oilfield was CaCl2-type, followed by many fouling cation Mg^2＋, while the Sr^2＋ and Ba^2＋ contents were relatively small. For fouling anions, they mainly contained HCO3^-, while CO3^2- and SO4^2- were less abundant. The fouling in the Qu-di Oilfield was mainly caused by the formation of dolomite crystals accompanied by the reaction of Ca^2＋, Mg^2＋, and HCO3^-. When the production fluids in different oil wells were mixed at low temperatures, the compatibility was good. With the increase of temperature, the degree of fouling increased, but the fouling rate was less than 5%. Expect the production fluids from the Q10-X16 oil well, the remaining production fluids were incompatible with the injection water from the joint station, and the fouling rate was larger than 10%. The 7# scale inhibitor and concentrations of 50 ppm were regarded as the scale inhibitor for the Qu-di Oilfield. Conclusion The 7# scale inhibitor from survey is applicable to the environment of Qu-di Oilfield. It has a high scale inhibition rate and can effec-tively reduce the fouling problem in Qu-di Oilfield.

关 键 词：曲堤油田 结垢机理 配伍性 阻垢剂 

分 类 号：TE88[石油与天然气工程—油气储运工程]