Mass flow circular mining supporting technology for pore sandstone heat reservoir double well unit
A technology for thermal reservoirs and sandstone, which is applied in the field of supporting technologies for large-flow circulation mining of well-unit bodies in porous sandstone thermal reservoirs, and can solve the problems of high consumption of mechanical energy and difficulty in realizing self-flow recharge and the like.
Active Publication Date: 2017-10-31
陈国富 +1
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Main problem: Circular mining consumes a lot of mechanical energy, and it is difficult to realize self-flowing and recharging
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[0019] 1 First find out the local geothermal geological conditions, the spatial distribution and properties of thermal reservoirs with water temperatures exceeding 35-40°C.
[0020] With high permeability (≥0.7μm 2 ), the sum of formation coefficients (permeability×reservoir thickness)≥150μm 2 .m, the well spacing is 400-500m. Circular mining volume 180-200m 3 / h.
[0021] With medium and low permeability (permeability≤0.7μm 2 ) mainly, formation coefficient ≤150μm 2 .m Well spacing 300-400m. Circular mining volume3 / h.
[0022] If it is an in-use well pairing, the well history and current situation should be investigated. For many geothermal wells, the bottom hole displacement may exceed 100-150m. In areas with poor geological conditions, underground well positions should be measured. Try to choose in-use wells as reinjection wells.
[0023] The water temperature of the production well can be maintained for 10-15 years. When the water temperature of the production ...
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The invention relates to a mass flow circular mining supporting technology for a pore sandstone heat reservoir double well unit. The invention firstly provides the concept of a small well spacing and mass flow double well circulation body and adopts a 'double well unit' circular mining supporting technology for solving the problem of tail water recharging. two geothermal wells which are used for mining the same reservoir and have a 300-500m interval are designed for overcoming low permeability of pore sandstone and high differential pressure consumed by geothermal water flowing in the heat reservoir, one well is used for mining and the other one is used for charging; a high differential pressure well washing technology is used for realizing the whole-process airtight mass flow circular mining for the geothermal energy; a heat pump and the geothermal water are adopted for integrally supplying heat and supplementing the heat reduced by the decreasing of the water temperature and the geothermal energy above 15 DEG C can be mined and utilized. The technology provided by the invention creates a world miracle for circularly mining 510,000 m<3> in 121 days with self-flowing, recharging, filling and mining water volume ratio of 98% and mining well water level slowly descended for 47m on recent pore sandstone heat reservoir double wells with a 420m well spacing in Huanghua in Hebei Province in 2015. The technology is beneficial to the large-scale development and utilization for pore sandstone geothermal field heat resource and can restrain the local descending of the underground water level.
Description
1. Technical field [0001] Large-scale development and utilization of geothermal resources in porous sandstone geothermal fields. 2. Background technology [0002] There is abundant geothermal energy in the shallow economic depth of 2400m in the North China Plain. This thermal energy, enthalpy, is in the sandstone framework and in the water in the pores. To circulate through the water, the heat in the thermal reservoir is brought out of the ground. The used tail water must be injected back into the ground to supplement the pressure consumed by the geothermal water. So far, the geothermal tail water cannot be successfully recharged underground. Not only the water in the thermal reservoir cannot be replenished, but also the salt in the water pollutes the fertile land on the surface, and the geothermal wells in use are easily scrapped. Mining by consuming formation pressure, most of the enthalpy in the thermal reservoir will remain underground, and the groundwater level is dr...
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IPC IPC(8): E21B43/30E21B43/40E21B21/16F24D3/18F24J3/08
CPCE21B21/16E21B43/30E21B43/40F24D3/18F24D2200/11F24D2200/12Y02B10/40
Inventor 陈国富陈虹波
Owner 陈国富