Study On Internal Anti-Corrosion Technology Of TaHe Oil Field Gathering System

A High salinity formation water in Tahe oilfield, Present acid. in Output medium, containing corrosive gas CO2 and H2S. gathering and transportation system in Tahe oil field locaked in salt lick. The corrosion environment is very complex for gathering and transportation system in Tahe oil field.In the past time, many of the corrosion problems of Tahe oilfield has various research, oilfield itself has taken anticorrosion measures, but the effect is poorer, corrosion incidents are increasingly serious trend.The reason, past research is separated from the anticorrosion measures basically, the corrosion and corrosion measures is an organic unity, but not be connected closely. Because of esch oil field corrosion environment and corrosion noumena are different, there is no possible to find one anticorrosion precautiont that is effectual for all oil fiel.therefore, corrosion and anticorrosion study is very necessary, also, is meaningful.it provides ideological preparation through investigation and research on the research outcome of carbon dioxide and sulfureted hydrogen corrosion.A large number of experimental research has been worked out. Firstly,the corrosion experiments for carbon dioxide and sulfide have been finished. For salt and carbon dioxide to the corrosion problems,the experiments in a general conditions, have been finished. Namely, exerperiments of simulation corrosion environment in most block of Tahe oilfied. Then,completed the experiment that salinity effect on corrosion rat.namely, experiment in a extremely salinity condition in Tahe oilfield. That is corrosion text finished with the temperature covereing all transportation medium in Tahe oilfield. after that, the corrosion experiments,under the combined action of salt,carbon dioxide and sulfide hydrogen, have been finished.first of all, the corrosion experiments have been worked out in a general condition and then corrosion rate experiment have been worked out in conditions of salinity and temperature effecting onIn the study of ion composition and content in liquid output in Tahe oilfield, and on the basis of research to study scale formation theory and prediction scaling method, the method of saturated index of calcium carbonate scaling trend is forecasted in Tahe oilfield typical production wells, and based on that, anti-scaling experiments, simulation scene conditions, have been finished.Antiscale agent FBR Screened. For FBR, anti-scaling experiment finished simulation on formation water in typical well whill FBR quantity than 25mg/L, the scaling rate is larger than 90%, can fully satisfy meet the needs. Of the oil field production.To aim at the corrosion environment in Tahe oilfield, developing a corrosion inhibitor for Tahe oilfield is the main research content of this subject, but also the focus of research. In order to evaluate developed corrosion inhibitor THA-1 and HTA-2. evaluated THA-1,THA-2 and Three corrosion inhibitors (HQ21, DA-1 and CT2-1) be used in Tahe oilfield in the same condition. Results show that:the corrosion inhibitors THA-1 and THA-2 have better performance than the others. At the same time, compatibility experiments, for THA-1 and THA-2 and the other chemical additive used in oilfiel, have been finished. The results show that the developed two inhibitor have good compatibility. the study of corrosion inhibitor is successful and is an important significance of technology innovation.Corrosion on-line monitoring technology is an important anticorrosion technology. the methods, linear polarization method, rapid corrosion rate determination method, check bar weight-loss method, have been selected Combine with the environmental features of Tahe oilfield. The contrast experiment,the methods adopted, have been worked out. On this basis, the weight loss method Combined with chemical analysis method, as a corrosion monitoring technology used in Tahe oilfield gathering and transportation system monitoring, have been adopted.Using the on-line monitoring network, two detections have been worked out. Results showed that the corrosion situation of Tahe factory 1 than the corrosion situation of Tahe factory 2 relatively serious, especially oil valve group in the station 1. The theoretical analysis and research results and locale event is consistent. This fully explain that the technical theory and method adopted in this monitoring system are correct.Online corrosion monitoring system from conception, theoretical analysis, design, construction and operation treatment to specimens are analyzed, and then again experiment is a complicated system engineering. It involves not only monitoring system itself, but also involves gathering transportation system of the process, equipment, materials, production process and production status, etc. This system established, is a gigantic technology progress for the system of ground gathering and transportation in Tahe oilfield.Twice on-line detection has been completed after filling corrosion inhibitors THA-1 and THA-2. Test results show that:corrosion inhibitor THA-1 has a corrosion inhibition efficiency over 80% and corrosion inhibitor THA-2 has a corrosion inhibition efficiency close to 80%. But, in china, the corrosion inhibition efficiency of a General commercial corrosion inhibitor is from 50% to 60%。At the same time, using The two kinds of corrosion inhibitors, the corrosion inhibition rates are controlled in the standard (0.076 mm/a) range. This fully demonstrated these two kinds of corrosion inhibitors developed, to aim at the gathering and transportation system in tahe oilfield, is reliable,and have been applied in tahe oilfield.