Nano-dialysis agent-纳米渗析剂

I. Product Introduction

The nano-permeable absorbent recovery agent for fracturing is mainly composed of surfactants and modified nanomaterials, and has good compatibility with the fracturing fluid system. After entering the formation, it undergoes adsorption and micelle solubilization with the rock surface through intermolecular forces, stripping crude oil from the rock surface, thereby improving the wettability of the rock surface and increasing hydrophilicity. By taking advantage of the heterogeneity of the reservoir and the capillary driving pressure difference, the fracturing fluid disdrives crude oil between artificial fractures, achieving oil-water displacement, enhancing the efficiency of infiltration and absorption, and replenishment of formation energy at the same time, thereby increasing the production of a single well.

Ii. Product Application

The nano-permeable active agent used for fracturing has a good effect of removing water lock, reducing the flow resistance of crude oil and improving the water flooding recovery rate. Compared with water flooding for oil recovery, the oil recovery using permeable active agent solution for fracturing can increase the crude oil recovery rate by more than 20%.

Iii. Background Technology:

The exploitation of oil fields mainly includes primary oil recovery, secondary oil recovery and tertiary oil recovery. However, the primary and secondary oil extraction in an oil field can only produce approximately one-third of the total crude oil volume, and the remaining two-thirds of the crude oil requires a third extraction. In the third oil recovery, substances such as surfactants need to be added to increase the oil yield. For low-permeability oil reservoirs with low formation energy, during the development process, there exist phenomena such as excessive start-up pressure gradient and injection pressure. In the extraction process, fracturing technology is usually adopted. The main purpose of fracturing is to form fractures with a certain geometric shape and high flow-conducting capacity, improve the channel path of fluids, and greatly increase the production of oil and gas.

2. The fracturing fluid in fracturing technology is a heterogeneous and unstable chemical system formed by various additives in a certain proportion. It is the working fluid used in the fracturing and modification of oil and gas layers. Its main function is to transfer the high pressure formed by surface equipment to the formation, causing the formation to rupture and form fractures, and then transport proppants along the fractures. The absorbents in fracturing fluid are usually surfactants. The absorbents in fracturing fluid can reduce the interfacial activity and surface activity of oil and water, enhance the self-priming effect of capillary tubes, and collaboratively displace crude oil into highly permeable fractures, thereby carrying out crude oil during water flooding. However, the existing absorbents for fracturing have poor salt resistance, are prone to hydrolysis failure, and have large formation adsorption losses. Therefore, the invention of fracturing fluid absorbents with better salt resistance, better shear resistance and better formation adsorption resistance is of great significance for improving the recovery rate of tight oil reservoirs.

Iv. Technical Indicators