In China's proven geological reserves, low-permeability oil reserves account for 12%, and low-permeability natural gas reserves account for 40%. The era of easily extractable crude oil has ended, and the difficult-to-extract stage has arrived. In low-permeability reservoirs, after fracturing, as the extraction time increases, the reservoir's own energy is continuously consumed, and the pressure continuously decreases, causing a significant decrease in output, and even shutdown, leaving a large amount of crude oil underground that cannot be extracted. Even with repeated fracturing, due to insufficient formation energy, the effect of repeated fracturing is not ideal. Many foreign companies use the method of developing nano-emulsion chemical agents to extract more oil and gas from existing oil and gas wells without the high cost of repeated fracturing or other technologies. In the past three years, nearly 175 wells have been field-tested in oil fields in Canada and the United States. Among them, 135 wells have implemented production increase measures; more than 40 wells have been fractured; test results show an increase in the total liquid volume of single wells, and while crude oil production increases, the water content decreases, thus proving the oil displacement effect of nano-oil displacement agents through imbibition and displacement.
　 　Nano-imbibition oil displacement agent independently developed by Jiebeitong
　　Using biomaterials to synthesize non-toxic, harmless, safe and environmentally friendly products, it is a green and environmentally friendly product. The nano-imbibition oil displacement agent molecules can weaken the hydrogen bond association between water molecules, producing "small molecule" water. This approach allows small molecule water to completely reach ultra-low permeability and super-low permeability reservoirs, displacing and displacing the remaining oil, thus significantly improving the recovery rate. The nano-oil displacement agent independently developed by Jiebeitong has completed research on multiple formulas, forming a series of products. It has been evaluated by units such as Changjiang University, China University of Petroleum, Southwest Petroleum University, PetroChina Langfang Branch, and Xinjiang Oilfield Engineering Institute, and its various indicators have reached the international leading level. Compared with similar products in the United States, Canada and other countries, and domestic similar products, its performance surpasses other products. Nano-imbibition oil displacement technology has the following advantages: (1) The molecular size of the nano-imbibition oil displacement agent is small, averaging 20nm, so its coverage ability is strong, it can significantly improve the coverage volume, and enhance the oil displacement ability through imbibition and displacement. (2) The nano-imbibition oil displacement agent can significantly reduce the oil-water interfacial tension, significantly reduce the driving pressure difference, and significantly improve the oil displacement efficiency. (3) The nano-imbibition oil displacement technology has a simple on-site construction process, is easy to use, has a significant on-site application effect on increasing production, and can extend the effective period of crude oil extraction.
　　 In November 2020, a certain oil field in western China conducted an application of nano-imbibition oil displacement technology for injection and production in old wells.
　　In order to compare the effect with conventional oil displacement technology, two wells, MaD4619 and Ma4719, with similar geological and engineering conditions in the Ma18 block, Aihu 1 fault block, were selected for the test. Both wells were in long-term adjustment before construction. In Ma4719 well, 5000 cubic meters of 0.2% nano-oil displacement agent solution was injected, and in MaD4619 well, 5000 cubic meters of 0.2% sulfonate solution was injected. After MaD4619 was shut in for 18 days, the well was opened, oil was seen in 6 days, the self-flowing period was 115 days, 202.3 tons of oil was produced, the daily liquid production after switching to pumping was 9.2 tons, the daily oil production was 6.1 tons, the water content was 33.7%, the cumulative oil production was 518 tons, 1932.6 cubic meters of liquid was discharged, and the return discharge rate was 27.08%; Ma4719 used Jiebeitong nano-imbibition oil displacement technology, and after being shut in for 49 days, the well was opened, oil was seen in 2 days, the self-flowing period was 112 days, 363.8 tons of oil was produced, the daily liquid production after switching to pumping was 14.5 tons, the daily oil production was 12.1 tons, the water content was 16.6%, and the cumulative oil production exceeded 1000 tons, which is twice that of Ma4619 well, while the liquid discharge was 1718.3 cubic meters, and the return discharge rate was only 14.88%, half of MaD4619. This result fully proves that Jiebeitong nano-oil displacement agent has good oil displacement ability.
　　Given the significant increase in production achieved in the early stage tests, in 2021, a certain oil field in western China further expanded its application. By the end of October, more than 60 wells had been injected, and 6 wells in the Bai21 block had been opened. Currently, they are all self-flowing production, with an average daily oil production of more than 15 tons per well, and an average water cut of less than 20%. Among them, the BT13391 well has the highest daily oil production of 38 tons, with a water cut of less than 5%, exceeding expectations and achieving significant economic benefits.
　　With the arrival of the "high water cut, low permeability" stage in domestic oil fields, conventional chemical driving systems are difficult to overcome their technical limitations, while nano-oil displacement technology has huge potential and is widely applicable to the displacement and cycling of sandstone and fracture-cavity carbonate reservoirs. Preliminary statistics show that the reserves of low-permeability/ultra-low permeability reservoirs suitable for nano-oil displacement in China are over 1.5 billion tons. The application of nano-oil displacement technology in the EOR field will lead chemical driving technology into a new stage of development, and will become the leading direction of enhanced oil recovery technology in low-permeability reservoirs, and Jiebeitong nano-imbibition oil displacement technology will play a greater positive role.

Construction site diagram

Construction site diagram