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Oil field liquid carbon dioxide injection device and injection method

A technology of liquid carbon dioxide and carbon dioxide, which is used in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of construction personnel and gas injection equipment threats, safety valve take-off failure, low safety, etc. The effect of normal startup, improving work efficiency and simplifying the operation process

Active Publication Date: 2017-07-04
XINJIANG DUNHUA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Oil field liquid carbon dioxide injection device and injection method
  • Oil field liquid carbon dioxide injection device and injection method
  • Oil field liquid carbon dioxide injection device and injection method

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Embodiment Construction

[0034] Embodiments of the present invention provide an oilfield liquid carbon dioxide injection device and injection method, which realize multiple chain protections of carbon dioxide injection, stable and reliable operation, and high safety performance.

[0035] On the one hand, in order to achieve the above object, the embodiment of the present invention provides an oil field liquid carbon dioxide injection device, which is connected with the Christmas tree and used to inject liquid carbon dioxide into the oil well for oil recovery, such as figure 1 As shown, the injection device includes:

[0036] CO for supplying liquid carbon dioxide 2 tanker 1, the CO 2 The tank car 1 has a canned pump 4;

[0037] A liquid inlet pipeline 5, one end of the liquid inlet pipeline 5 is provided with a joint assembly, and the joint assembly 3 is connected to the liquid supply end of the canned pump 4 to form a liquid supply pipeline;

[0038] A carbon dioxide plunger pump 10, the inlet of th...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
CPCE21B43/164
Inventor 李成成胡海平苟国磊阙蒙杨金龙武生莲范亮亮王军平
Owner XINJIANG DUNHUA PETROLEUM TECH CO LTD
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