Linear ¦Á Olefin-based Mud System And Rheology

Firstly appeared in 1980s, the development of synthetic based mud (SBM)was for the sake of confliction between engineering and environment laws.First: research the possibility of formulate LAO SBM with industry product, choose industry product that can formulate LAO SBM, especially products that can promote organoclay dispersing, and study the rheology of LAO SBM. Discussed mechanism of agents, rheology and filtration. Second: research the difference of SBM and OBM viscosify mechanism, and the problems of this kind of distinction. Based on experimentation, found out organoclay can not dispersed into colloid in LAO, but rheology could be obtained by mix based fluid emulsion and organoclay, using the polar group of emulsion to promote organoclay dispersing.Third: After aging, rheology parameters of LAO SBM reduced, it often induce question such as cutting transportation problem and barite settlement. For solving these questions, we introduce viscosity index improver to improve temperature endurance of the mud. By appending introduce viscosity index improver, mud could be more viscosity at high temperature, while little influence at low temperature. That maybe helpful to solve the questions.Fourth: temperature and pressure can influence rheology, this paper survey the high temperature and high pressure of LAO SBM, research the influence of temperature and pressure to rheology. And choose suitable model to simulate it' s rule.Fifth: LAO SBM often face the problem of density, as it could induce wellbore collapse and circulation leak, while WBM at the same density could not. This paper choose a simple equivalent circulation density model to calculate. The result indicate that start pump after long stillness could make the difference of ECD and surface density large.