环保型连续油管金属减摩剂的研制与性能

The Development and Properties of an Environmentally Friendly Metal Friction Reducer for Coiled Tubing

针对水平井长水平段连续油管作业过程中的锁定问题,采用改性植物油、表面活性剂、乙二醇作为核心主剂,制备了水包油型环保金属减摩剂。考察了该金属减摩剂在不同加量、矿化度、pH值和温度条件下对N80、P110、Cr-13钢块摩擦系数(CoF)的影响规律,同时采用MTT实验和动物实验评价了金属减阻剂的环保性能。结果表明,金属减摩剂加量为0.5%时,减摩效果最明显,使N80钢块的CoF降低至0.12(清水对应的CoF为0.42),CoF降低率达到71.4%;使P110钢块的CoF降低至0.16(清水对应的CoF为0.475),CoF降低率达到66.3%;使Cr-13钢块的CoF降低至0.115(清水对应的CoF为0.75),CoF降低率达到84.7%。金属减摩剂耐温达到140℃,适用pH值范围为1~10,耐矿化度达到30000 mg/L。金属减摩剂细胞增殖率在95%~150%之间,半致死浓度LC50约为55000 mg/L,无细胞毒性和动物毒性。研制的环保型金属减摩剂具有优异的减摩性能,满足连续油管现场作业要求。

An environmentally friendly oil in water(O/W)metal friction reducer has been developed to address the locking problem encountered in coiled tubing operation in a horizontal well with long horizontal sections.The metal friction reducer was made from several core reactants such as a modified vegetable oil,a surfactant and ethylene glycol.Laboratory experiment was conducted to study the effect of the friction reducer on the coefficient of friction(CoF)of N80,P110 and Cr-13 steels at different concentrations,salinities,pH values and temperatures.The effect of the friction reducer on the environment was also studied through MTT experiment and animal test.It was found that at concentration of 0.5%,the friction reducer performed at its best.At this concentration of the friction reducer,the CoF of N80 steel was reduced from 0.42(tested with water and N80 steel)to 0.12,or a percent reduction in CoF of 71.4%,the CoF of P110 steel was reduced from 0.475(tested with water and P110 steel)to 0.16,or a percent reduction in CoF of 66.3%,the CoF of Cr-13 steel was reduced from 0.75(tested with water and Cr-13 steel)to 0.115,or a percent reduction in CoF of 84.7%.The metal friction reducer can be used at 140℃,in a pH range of 1–10,and can tolerate salinity up to 30,000 mg/L.The metal friction reducer has cell proliferation rate between 95%and 150%,and LC50 of about 55,000 mg/L,indicating that the it has no toxicity to cells and animals.The metal friction reducer has excellent friction reduction performance and can satisfy the needs of field coiled tubing operation.