Paraffin Technology Research Of Tahe Oilfield Oil Pipeline

Ta He oil field is in the period of tertiary oil recovery,the oil that it products has poor mobility and belongs to"three high"crude oil.Different level wax precipitation had existed in oil gathering and transportation pipilines since Ta He oil field exploited, which affects the safe operation of pipelines. Heating transportation commonly adopted has the defects as narrow transportation scope, great transportation energy consumption, high investment and operating costs of facilities etc. Adding depressant into the crude can effectively change the crystal morphology of solid hydrocarbon of crude oil, which makes it difficult to form network space.It can improve the rheological behaviour at lower temperature, reduce energy consumption and production cost. But the oil of Ta He oil field has the large variation range of physical properties and complicated flow patterns. Different paraffin inhibitor has sensitivity according to the different oil. Therefore, it is necessary to study Ta He oil field physical properties,develops the appropriate paraffin inhibitor and further researching on paraffin inhibition scheme in the oil piprline transportation,which can reduce energy consumption and production costs.This thesis introduced the present situation and development of oil gathering and transportation pipeline paraffin control technologies.The basic characteristics and viscosity-temperature characteristics of Ta He oil were analynized according to the laboratory experiments. Then this thesis analyzed and summarized the mechanism and affecting factors of wax deposition in pipelines, studied the wax deposition rule of Ta He oil through laboratory experiments, analyzed the cause of paraffin deposition in Ta He oil pipeline with the related theory.This thesis combined oil physical analysis results and synthesized four kinds of paraffin inhibitor in connection with the oil samples which collected at the scene acconding to the theory of applied chemistry and high polymer chemistry.According to the different oil samples,paraffin inhibitor selection works were conducted through laboratory experiments and determined the optimal paraffin inhibitor type and adding conditions. Combined with the Ta He oil field practical production conditions, the compatibility between paraffin inhibition scale inhibitor was studied through laboratory experiments.On the basis of laboratory experiments results, the paraffin inhibition schemes for Ta He oil field oil gathering and transportation pipeline is proposed:the scheme that adding depressant into oil combining with ultrasonic treatment was adopted and the feasibilities of paraffin inhibition schemes were demonstrated. Finally, the the economic benefits of paraffin inhibition schemes were calculated and analynized, which showed that it can get substantial economic benefits.