SCREENING FOR EFFICIENT AGENTS FOR TRANSPORTATION AND TREATMENT OF OIL OF SOUTH-KHYLCHUIU FIELD
Oil of most of domestic and abroad fields is produced by a flooding of oil-bearing formations method. That leads to intensive mixing of oil and formation water and unavoidable formation of persistent water-oil emulsions. Demulsifiers are used to destroy water-oil emulsions and obtain commercial oil in gathering, transportation and treatment systems. In case of high water cut and certain modes of transportation demulsifiers can be a reason of free water formation. Due to its aggressive behavior water can lead to corrosion of a lower part of pipeline system. Therefore, along with demulsifiers a corrosion inhibitor is injected into systems of well fluid transportation. But some demulsifiers, having good washing properties, wash off from internal walls of pipes both an oil film and protective film of corrosion inhibitor adsorbed on them. In turn, some corrosion inhibitors can be emulsifiers, and adding them to a system of intratubular demulsification can have a negative effect on the processes of separation of water from oil. In this regard, compatibility of demulsifiers and corrosion inhibitors is very relevant question. A solution for such problems needs to screen agents that will not reduce demulsifying and protective properties of each other. Oil of South-Khylchuiu field has high paraffin content and positive pour point. So, during transpiration it is needed to take into account that at low temperatures oil reveals non-Newtonian properties. Stop in transportation will possibly show formation of paraffin structures. That can lead to decrease in rate capacity of pipeline and significantly complicate operation. Studies, carried out in the field of transportation of oil with high paraffin content, revealed that in order to improve transportation of high-hardening oil and heavy oil products it is possible to use substances such as flow stimulators (depressant additives). This method does not require large additional capital costs. With a sufficiently wide development of production of additives it can be economically more profitable compared to other methods of transportation.