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Technological method for sealing operation of middle-deep U-shaped butted geothermal well casing pipeline

A process method and geothermal well technology, applied in sealing/isolation, drilling equipment and methods, drilling equipment, etc., can solve problems such as environmental damage, groundwater needs to be recharged, and no water in areas rich in geothermal resources, so as to achieve safe operation Effect

Inactive Publication Date: 2018-01-30
中国煤炭地质总局水文地质局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Geothermal energy is a green and clean energy. There are two main ways to obtain geothermal energy: one is to take out geothermal water and obtain geothermal energy directly or through ground heat exchange; the advantage of this method is that the process is simple and the heat energy is high. The utilization rate is high, but the disadvantages are: the groundwater needs to be recharged, and some areas cannot be recharged, causing the groundwater level to drop, the environment to be damaged, and some areas rich in geothermal resources to have no water, so this method cannot be used
[0004] (1) A large number of central pipes or heat exchange devices are lowered into the well, and there are unsafe factors, which are more prominent when the well depth is large;
[0005] (2) Heat exchange is carried out in the whole section of the geothermal well, and it is difficult to control the heat exchange section;
[0006] (3) It is difficult to implement in directional geothermal wells and horizontal geothermal wells that obtain high geothermal energy

Method used

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  • Technological method for sealing operation of middle-deep U-shaped butted geothermal well casing pipeline
  • Technological method for sealing operation of middle-deep U-shaped butted geothermal well casing pipeline
  • Technological method for sealing operation of middle-deep U-shaped butted geothermal well casing pipeline

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The formation in the butt joint interval is stable and complete without pores, fissures, or karst caves; the construction is carried out using the circulation type of open hole channel, and the construction method is as follows: Drill the vertical well to the predetermined depth A, and run the production casings 1 to A in the vertical well At point C, use a small-diameter core drilling smaller than the inner diameter of production casing 1, continue to drill down 5-6mm to reach point C, then clean the wellbore with a large amount of pump, and drill the butt well to the predetermined depth B by using precise directional drilling method Point, run the production casing 1 to point B in the docking well, adopt a small diameter core drilling smaller than the inner diameter of the production casing 1, and communicate with the slim hole of the vertical well;

[0044] Through the circulation of slurry, there is no sediment at the bottom of the well and in the wellbore; then a pr...

Embodiment 2

[0050] The stratum in the butt joint layer is stable and has poor integrity, and there are pores, cracks and caves; the cement body wellbore channel type circulation type is used for construction, and the construction method is as follows: Drill the vertical well to the predetermined depth C, and use the hydraulic method to create the cavity , the cavity diameter is 10m, and the cavity height is 12m. Cement is injected to form cement body 4. After the cement body 4 solidifies for 24 hours, use a high-pressure gun to flush to point A, flush into the cement body 4, and run the production casing in the vertical well. From point 1 to point A, use small-diameter core drilling smaller than the inner diameter of production casing 1, continue to drill down 5-6mm to reach point C, then clean the wellbore with a large amount of pumping, and use precise directional drilling to drill the butt well to Predetermined depth point B, enter the cement body, run production casing 1 to point B in ...

Embodiment 3

[0058] The strata in the butt joint layer are stable and have poor integrity, and there are many pores, fissures, and karst caves. Mechanical and hydraulic methods cannot be used to form larger chambers; the construction is carried out using the circulation type of cement liner wellbore channel type, and the construction method is as follows: vertical well drilling Go to the predetermined depth point C, use the hydraulic method to build the cavity, the final cavity diameter is ≥ 4m, the cavity height is < 10m, inject cement to form the cement body 4, and after the cement body 4 is solidified for 24 hours, use a high-pressure gun to flush to point A and flush Enter the cement body 4, after the cement body is solidified for 72 hours, run the production casing 1 to point A in the vertical well, use a small diameter smaller than the inner diameter of the production casing 1 for core drilling, and continue to drill down 5-6mm to reach point C, Then the wellbore is cleared with a lar...

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Abstract

The invention provides a technological method for sealing operation of a middle-deep U-shaped butted geothermal well casing pipeline. According to the formation condition of a butting layer, differenttypes of circulation are selected from the following three types for construction: a naked eye channel type, a cement wellbore channel type and a cement screened pipe wellbore channel type. The nakedeye channel type is suitable for the butting layer which has stable and integrated formation, and no holes, fractures and karst caves. The cement wellbore channel type is suitable for the butting layer which has stable formation, poorer integrity, holes, fractures and karst caves. The cement screened pipe wellbore channel type is suitable for the butting layer which has stable formation, poor integrity, and many holes, fractures and karst caves. The use of mechanical methods and hydraulic methods cannot cause a larger chamber. The technological method for sealing operation of the middle-deepU-shaped butted geothermal well casing pipeline can arbitrarily select heat exchange well sections to obtain high geothermal energy so as to achieve the purpose of taking heat and not drawing water.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy development, and in particular relates to a process method for sealed operation of casing pipelines of U-shaped butt-grounded thermal wells in middle and deep layers. Background technique [0002] Geothermal energy is a green and clean energy. There are two main ways to obtain geothermal energy: one is to take out geothermal water and obtain geothermal energy directly or through ground heat exchange; the advantage of this method is that the process is simple and the heat energy is high. The utilization rate is high, but the disadvantages are: the groundwater needs to be recharged, and some areas cannot be recharged, resulting in a drop in the groundwater level, damage to the environment, and no water in some areas rich in geothermal resources, so this method cannot be used. The second is to take heat without taking water. By injecting a fluid medium into the well, the fluid medium is cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/04E21B43/30E21B7/18E21B33/13E21B43/10
Inventor 王永全季学庭程英好
Owner 中国煤炭地质总局水文地质局
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