New Technologies to Improve Reservoir Recovery Rate in Dagang Oilfield
On August 31, the reporter learned that the international pioneered micro-nano scale oil displacement test and analysis system creatively replaced the traditional micro glass model and core experiment, providing key support for different types of reservoir seepage law and oil recovery technology. At present, the relevant technologies have been first used in Dagang Oilfield, Tuha Oilfield, China University of Petroleum (Beijing), Southwest Petroleum University and other enterprises and universities.
As a typical representative of the broken block reservoir in Bohai Bay Basin, Dagang oilfield has broken structure and reservoir heterogeneity is strong. The long-term water injection development of old oil fields is highly dispersed. Therefore, it is urgent to clarify the distribution, type, content and corresponding starting mechanism of the residual oil. To this end, relying on the postdoctoral workstation and Tianjin Key Laboratory of Dagang Oilfield Oil Production Technology Research Institute, the technicians of Dagang Oilfield Oil Production Technology Research Institute established the first micro displacement and displacement laboratory of the oilfield, and developed the international first micro-nano scale oil displacement test and analysis system.
This system can accurately describe the distribution form, occurrence pattern and content proportion of the residual oil after water flooding. Through different residual oil starting mechanisms, it supports the accurate development of an efficient chemical flooding system suitable for the target oil reservoir, and finely designs the injection mode to support all kinds of oil reservoirs to greatly improve the oil recovery.
In order to expand the research field more accurately, Dagang Oilfield has applied the technology to Marine and shale oil, and successfully solved the problems of less natural core core, high cost, poor repeatability, difficulty and insufficient accuracy of indoor experiments in shale oil reservoirs. The cost of chip model is only 1 / 10 of natural core. Through digital modeling and ultraviolet lithography, the error rate of each batch model is less than 1 / 1000, laying a foundation for the future selection of enhanced oil recovery technologies in offshore fields and shale reservoirs.
At present, the new heavy oil component microscopic analysis test system has completed the technical research and development. By analyzing the SARA component of heavy oil on the homemade chip, the original 3 days was shortened to 6 hours, and the accuracy was increased from 80% to 95%, which is an important "weapon" for the efficient development of heavy oil reservoir.
According to relevant researchers, this original technology can greatly shorten the development cycle of EOR technology after the rapid transformation of achievements, and at the same time, the good market prospect of this technology and product can also produce considerable economic benefits.