Submersible pump high pressure injection technology

Dong Guoqiang, Wang Hongyan, Qiu Yongfa, Xu Mingyong (Electric Submersible Pump Research Institute, Institute of Oil Production Engineering, Zhongyuan Oilfield, Puyang, Henan, China, Sealing wellhead of wellhead hanger, Puyang 457001, Henan, China, to achieve supercharging and injection of submersible electric pumps. The field application has good results and can meet the needs of production and development. demand.

Submersible pumps High-pressure injection unit installation form At present, there are mainly two types of oil injection equipment for oil fields, namely ground centrifugal pumps and piston pumps. The ground centrifugal pump has large displacement and low water injection costs, and it needs a fixed factory building and water injection pipe network, which is the main method for the development of large-scale water injection. The plunger pump has high pressure and high pump efficiency. It is suitable for establishing small water injection stations to adapt to small high-pressure water injection blocks. It is necessary to establish a pump room, a pipe network, and so on. Sometimes it is necessary to use a water source well. The submersible pump high-pressure injection technology is based on the mature submersible pump products and solves the low-permeability oil fields and remote well areas that are constrained by the existing pipe network design, pipe network distance, and rising water injection pressure. Water injection.

1 Process principle 1 - incoming water line; 2 - high pressure check valve; 3 - high pressure cable wellhead; 4 - frequency control cabinet; 5 - tubing hanging; 6 - power cable; 7 - inverted centrifugal pump; 8 - leading cable; 9- water inlet; 10-protector; 11-submersible motor; 12- water injection layer using the ground to water, through the wellhead high pressure check valve through the centrifugal pump pressurizes through the water injection port pressurized to the oil sleeve annular space, into Water injection layer to achieve general water injection. In order to meet the special requirements of high pressure injection and convenient installation and construction, an inverted centrifugal pump structure is needed; considering the absence of gas influence, the oil and gas separator is replaced by a water injection port with simple structure; the use of mature variable frequency control technology to achieve flexible adjustment of water injection volume Design high pressure over cable eccentric wellhead hanger to achieve high-pressure wellhead seal. The unit installation form is as follows.

2 Key technologies 2.1 Inverted centrifugal pumps use PTFE wear-resistant friction pads, semi-floating external thickening centrifugal pump design structure, the bearing fits with a carbide design to meet the performance requirements of the centrifugal pump under water injection conditions. Centrifugal pump lifting head assembly according to the actual water injection requirements.

2.2 Eccentric wellhead hanger for high pressure over cable design The eccentric wellhead hanger is designed to meet the pressure bearing capacity, suspension capacity and the size of wellheads. Three cable cores are designed to pass through the hole, and a tapered rubber body is used between the cable and the inner hole. Seal and press tightly with the locking cap up and down. Structure as.

The device test pressure 40MPa, no leakage for 5 minutes, measuring the cable insulation resistance> 2500MD. After the removal of 50 in the high-new domain private 2012.05 check the cable appearance is not damaged, measuring the cable insulation resistance to earth> 38.5m3, oil by 1.8 t rises to 3.5t, the water content drops from 92% to 1, the cable core 2, the upper locking cap 3, the upper conical sealing body 4, the hanger body 5, the lower conical sealing body 6, the lower locking cap high pressure over The cable eccentricity wellhead hanger indicates the field test. 3.1 The application example system has a water pressure of 14.5 MPa, a pump pressure of 24.5 MPa, an oil pressure of 20.9 MPa, a mantle pressure of 20.9 MPa, and a 50 m3 injection, corresponding to the well HC5-110, to improve the water injection effect. The H5-92 well implements high-pressure injection pumping process for submersible electric pumps. The required daily water injection volume is 50m3, and the injection volume and injection pressure can be adjusted.

3.2 Application Pressure 370V, working frequency 30Hz, system water pressure 14.5MPa, water injection pressure 21MPa (clamp pressure), daily water injection 51m3, to meet the geological and engineering requirements, the current water injection well is normal. Corresponding to the well HC5-110, good results were achieved, and the daily production volume increased from 21.6m3 to 4. Conclusion First, the submersible pump high-pressure injection technology can meet the water injection requirements of the oilfield. The amount of water injection can be flexibly adjusted according to actual needs using frequency conversion.

Second, there is no need to build a pump room on the ground, no noise, no environmental pollution caused by medium leakage, long operating life, and no ground maintenance. Especially for new development blocks and remote blocks, water injection costs can be saved.

Third, all the high-pressure parts were moved downhole and the safety performance was more reliable.

Fourth, due to the low temperature of the unit's working environment (system water temperature below 50C), it is more conducive to the extension of the working life of the motor and cable.

Fifth, the actual pumping depth is shallow, so that the cost of the submersible electric pump unit is greatly reduced, which is conducive to the promotion and application of the process. At the same time, it expands the application range of submersible pumps.

Sixth, the process is currently only applied to general water injection. If stratified water injection is to be achieved, the water injection string and downhole tools must be properly adjusted and matched.

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