Geothermal wellhead

Geothermal well refers to the method and device for generating electricity with geothermal energy of about 3500 meters deep or hot spring with water temperature greater than 30℃.Geothermal can be divided into three categories: high temperature, medium and low temperature.

  • Higher than 150℃, in the form of steam, belongs to high-temperature geothermal;
  • 90℃ ~ 150℃, in the form of water and steam mixture, belongs to the medium temperature geothermal;
  • Higher than 25℃ and lower than 90℃, belongs to low temperature geothermal.

Geothermal wellhead equipment is the most basic wellhead equipment in geothermal well development.

It is necessary to maintain the normal operation of geothermal well production, conduct dynamic monitoring of hot water, prevent accidents caused by well pipe expansion and ground descent, and reduce the corrosion effect of hot water.

With the gradual development of geothermal utilization, the wellhead devices of geothermal wells are gradually standardized.

geothermal wellhead and christmas tree

There are three kinds of wellhead devices in geothermal wells: multifunctional wellhead devices, wellhead oxygen isolation devices and wellhead desanding devices.

(1) Multifunctional wellhead device.

Geothermal wellhead equipment is the most basic wellhead equipment in geothermal well development.

It is necessary to maintain the normal operation of geothermal well production, conduct hot water dynamic monitoring, prevent accidents caused by well pipe expansion and ground drop, and reduce the corrosion of hot water.

With the gradual development of geothermal utilization, the wellhead equipment of geothermal wells is gradually standardized. One of the most widely used geothermal devices in China is the well head.

geothermal wellhead equipment

(2) Wellhead oxygen isolation device.

In order to prevent the geothermal water from contacting with the air at the wellhead and reduce the corrosion damage of the water conveyance equipment caused by the combined action of oxygen and chloride ions in the geothermal water, oxygen isolation equipment is installed in some geothermal wells with corrosive effect.

One of the most commonly used methods is nitrogen protection.

Wellhead oxygen isolation device

(3) Wellhead cyclone desander.

In some geothermal wells, due to geological and construction factors, the sediment concentration in the water exceeds the national standard for industrial water (the sediment concentration should be less than 1 / 2 million), which affects the normal use of hot water.

If the geothermal water with high sand content is used for heating, the pipeline system will be blocked.

Therefore, sand removal measures should be taken for the geothermal well with sand content exceeding the standard.

The cyclone desander designed in China is an ideal desander in the geothermal utilization system. The equipment is generally installed on the outlet pipe of hot water wellhead.

wellhead cyclone desander

Working pressure   psi3000, 5000
Nominal main diameter (in)13-5/8, 11, 7-1/16
Working temperature ℃370
Working mediawater
Material classDD/EE/FF
Specification levelPSL1/PSL2/PSL3
Performance levelPR1

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