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Well head system for geothermal tertiary system sandstone recharge

A geothermal and sandstone technology, applied in the field of geothermal resources development and utilization engineering, can solve physical, chemical, gas blockage and other problems

Inactive Publication Date: 2005-03-02
TIANJIN UNIV
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Problems solved by technology

[0003] In order to solve the problem of physical, chemical and gas clogging, the purpose of the present invention is to propose a wellhead system for Tertiary sandstone recharge by adopting sand discharge, filtration and degassing methods.

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  • Well head system for geothermal tertiary system sandstone recharge

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Embodiment Construction

[0007] The present invention will be further described below by means of the accompanying drawings and examples.

[0008] my country began to pay attention to Tertiary sandstone recharge in the early 1980s, and conducted experiments in geothermal wells such as Tanggu and Dagang. However, due to the unsolved blockage problem, the recharge rate will become lower and lower with time, and the recharge rate is only up to About 20-30%, some even can't recharge. Through the implementation of the present invention in the geothermal demonstration project of Huatai Agricultural Garden in Dongli District, Tianjin, the production rate is 60t / h, the recharge rate is 50t / h, and the recharge rate can reach more than 80%. Since there may be metal slag particles or sediments with large particle sizes in the production well pipeline, the use of filter elements with the same precision in the filtration process will increase the filtration load and increase operating costs. Therefore, for this em...

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Abstract

The invention concretely relates to reinjection technique of geothermal well of geothermal resource exploitation and utilization engineering can be used in geothermy tertiary sandstone reinjection collar system mainly use two-staged coarse filter group4 reinjection system linked in series of coarse filter group and secondary filter group with parallel connection, pressurizing reinjection pump and enforced exhaust tank geothermic fluid flows into the first stage of coarse filter group with filtration accuracy of 50 to 80mum, then the second stage of secondary filter group with filtration accuracy of 3to5mum, the filter element material is the third generation polyethylene sintered filter element or filtration bag, after two filtration stages water quality can be guaranteed basically. The invention can prevent air resistance caused by physical, microbe, chemical factors, increase microbe higher than 30%. The system is installed and adjusted conveniently, maintained simple, its monitoring method complete, although it is aimed at sandstone formation, it can also be adopted for other layer like and can exploit and utilize tertiary geothermal resource reasonably.

Description

technical field [0001] The geothermal resources development and utilization project of the invention specifically relates to the recharge technology of geothermal wells. Background technique [0002] At present, the development and utilization of geothermal resources has formed a relatively mature industry, especially the utilization of geothermal heating and water resources, which has greatly stimulated the development of related industries. The development targets of geothermal resources are mainly concentrated in Wumishan Formation and Tertiary sandstone thermal reservoirs. However, due to the characteristics of sandstone thermal reservoir rocks, during the recharge process, due to the mass transfer between the dissolution of unsaturated minerals and the formation of secondary minerals at a given temperature, as well as the dissolution and precipitation of minerals as the temperature increases, the sandstone thermal reservoir There are great...

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Application Information

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IPC IPC(8): E21B43/34F24J3/08
CPCY02E10/10
Inventor 朱家玲蔡建新李春华王学芬李连举
Owner TIANJIN UNIV
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