原油基压裂液研究

研制了一种适用于低压、低渗、水敏性储集层的新型原油基压裂液体系。根据基液原油的组分合成相应的增稠剂，增稠剂在原油中与交联剂反应，形成网状结构，使原油成为黏度可以调控的冻胶，从根本上改变了油基压裂液以柴油、煤油为基液的现状，降低了油基压裂液的成本，同时还提高了压裂液的抗温、抗剪切和破胶性能，并将交联时间缩短到2h以内，可以满足现场压裂施工的要求，大大降低了施工强度和压裂改造的综合成本。在青海油田进行的现场先导试验取得成功。图9表1参5

A study of oil-base fracturing fluid

A new oil base fracturing fluid has been studied and reported, which can be used for developing of reservoirs under the conditions of low pressure, low permeability and water sensitivity. According to the component of crude oil, a thickener synthesized, which can be reacted with crude oil and be mixed into thickened oil. Through a cross linking reaction, a gel system is formed. The viscosity of gel can be controlled by the concentrations of thickener and cross linker. Crude oil is used as a substitute of diesel and kerosene in this oil base fracturing fluid, so the cost of fracturing fluid is decreased sharply. At the same time, thermo stability and shearing strength are increased. The cross linking time can be controlled in 2 hours. After gel breaking reaction, the viscosity of fracturing fluid is decreased, which is correspond to that of crude oil. The new oil base fracturing fluid can be used economically and easily in some low permeability oil fields. A pilot test is conducted successfully in Qinghai Huatugou oil field, Qinghai Province, northwest China.