Improving the efficiency of bottomhole zone treatment (OPZ): chemical treatment in conjunction with ultrasound exposure.
Union of Scientific and Industrial Chemistry JSC carries out research and development work (R&D), starting from scientific research and ending with the production of prototypes of products. As a result of the applied R&D, the production of new types of products is being mastered and new technologies are being introduced.
Description
The technology is based on a combination of chemical and physical methods to enhance oil recovery. The use of chemical reagents and physical fields enables the achievement of a synergistic effect significantly increasing the efficiency of processing.
The innovative method involves pumping acidic compounds and solvents of the SNPH grade into the reservoir with simultaneous treatment with acoustic waves.
The combined application allows:
- To increase the penetration of acid composition into the reservoir by several times;
- Activate the chemical reaction in the acoustic impact zone in a controlled manner.
Depending on the characteristics of the treated boreholes, it is possible to use acoustic waves of the ultrasonic range, as well as acoustic shock waves.
Advantages of combined exposure
- Increased impact efficiency during well treatment by reducing surface tension at the oil-water and oil-rock boundaries;
- Increased efficiency of chemical treatment due to acoustic effects;
- Increased processing area due to the connection of low-permeability sublayers;
- Controlled activation of chemical processes in the acoustic impact zone;
- Increased oil recovery in difficult geological and physical conditions of facilities operation, as well as in the development of hard-to-recover reserves.
Distinctive features of ultrasonic equipment
The power of the device in the borehole is 4 kW;
The device is lowered into the well using a geophysical cable in the oil-well tubing;
The possibility of interval treatment of the reservoir;
Control of the parameters of the ultrasonic borehole tool (power, frequency).
The length of the radiator is up to 2.5 m
The power of the device in the well is 4 kW
The facility is equipped with a remote computer control system
The diameter of the reservoir model is 32 mm with a laboratory ultrasonic generator TS4M1: (frequency 24 kHz, maximum power 700 W)
Laboratory and field tests
The results showed an increase in the efficiency of chemical treatment due to acoustic effects:
- Expansion of the processing area and involvement of new sublayers in the development;
- Increase of the oil permeability of the reservoir;
- Fragmentation of the porous medium in the bottomhole zone;
- Increasing the injection rate of chemical reagent;
- Reduction of work time during the development of low-permeability, damaged, hard-to-recover productive formations;
- The combined use of solvent with ultrasonic treatment allows increasing the efficiency of the method by ~20%;
- Ultrasonic effect enhances the strength characteristics of cement stone by 1.5-2 times.