Research and Application of Degradable Impervious Materials in Workover Field

It is difficult to do innocuous treatment of the woven polyvinyl chloride geofilm impervious cloth which is used in the workover field. In order to solve those problems, researchers study the environmental protection degradable impervious cloth to prevent oil and water from leaking during the oil well operation, while secondary pollution will not be formed. So that it can achieve the purpose of green oil well operation at last. Based on the characteristics of degradability and impermeability, researchers discover the main functions and shortcomings of impervious cloth and research on the screening of degradable materials, the design of indoor formula, the preparation process and the post-treatment technology. Developing products are suitable for the use of workover and harmless treatment in later stage. Among many degradable materials, PLA and PBAT have excellent degradability, suitable mechanical strength, large scale of production and close price to traditional materials, so they are optimal for the production of composite impervious cloth. Combined with the characteristics of two kinds of materials, PLA non-woven fabric and PBAT/PLA film were selected as raw materials to produce composite impervious cloth. Through the experiment and optimization combination, the composite impervious cloth with different area, thickness and strength could be processed and produced. After well workover treatment site laying and trial in oil field, result shows that the practical application effect is enough good, that can effectively prevent crude oil leakage and protect workover site environment. Based on the biodegradable impermeable cloth developed by environmental protection materials, the problem that the ordinary impervious cloth not being degraded cause the secondary pollution is solved. So that we can build the last barrier to prevent and control the pollution during workover treatment.