Oil field liquid carbon dioxide injection device and injection method

Abstract

The invention discloses an oil field liquid carbon dioxide injection device and an injection method, and belongs to the technical field of oil field exploitation. The injection device comprises a CO2 tank truck, a liquid inlet pipeline, a carbon dioxide plunger pump, a variable frequency motor, a controller, and a liquid extrusion pipeline. The CO2 tank truck is provided with a shielding pump. The liquid inlet pipeline is connected with the shielding pump to form a liquid supply pipeline. The inlet of the carbon dioxide plunger pump is connected with the other end of the liquid inlet pipeline. The variable frequency motor is connected with the carbon dioxide plunger pump. The controller is connected with the variable frequency motor. One end of the liquid extrusion pipeline is connected with the outlet of the carbon dioxide plunger pump, and the other end is connected with a Christmas tree. The liquid extrusion pipeline is provided with a safety valve, an electro connecting pressure gauge, an outlet pressure transmitter, an air release valve, and a pump outlet valve. The electro connecting pressure gauge and the outlet pressure transmitter are respectively connected with the controller. The electro connecting pressure gauge, the outlet pressure transmitter, the controller, and the safety valve form multiple interlock protection, and safety performance is high.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to an oil field liquid carbon dioxide injection device and an injection method. Background technique [0002] CO 2 Oil flooding is an important method in oil field gas injection tertiary oil recovery technology. This technology is suitable for conventional oil reservoirs, especially for low and ultra-low permeability oil reservoirs. It can significantly improve oil recovery and meet the needs of oil field development. In addition, it can also solve the problem of carbon dioxide sequestration and protect the atmospheric environment. Under the background of energy shortage and energy saving and emission reduction, this technology has a very broad promotion prospect. At present, my country has begun to devote itself to CO2 injection in oilfields. 2 Development and application of tertiary oil recovery technology. In order to improve storage and transportation efficien...

AI Technical Summary

Problems solved by technology

Since carbon dioxide is a low-temperature medium, long-term injection may cause the internal seal of the safety valve to fail

If the injection pressure exceeds the maximum design pressure and still does not jump, it may cause damage to the formation and pose a threat to construction personnel and gas injection equipment

In addition, major oil fields require pressure testing of equipment before injection. The pressure value is often difficult to control, and it is very easy to overpressure during operation, causing pipeline leakage and frostbite, stabbing the operator, and may also cause the safety valve to fail to take off.

Therefore, the existing injection device has the disadvantages of single overpressure protection and low safety

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