A geothermal well heat circulation method

A geothermal well and geothermal technology, applied in the directions of geothermal energy, geothermal energy power generation, geothermal collectors, etc., can solve the problem that the injected hydrothermal energy cannot meet the actual needs, achieve a good market prospect, expand the involved fields and workload, and reduce costs Effect

Active Publication Date: 2018-07-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, under the unit displacement, the heat energy brought out by the injected water cannot meet the actual needs

Method used

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  • A geothermal well heat circulation method

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Experimental program
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Effect test

Embodiment 1

[0041] In order to overcome the impractical problem of taking out heat energy in the existing method, the present invention provides such as figure 1 A geothermal well thermal cycle system is shown, the invention is used to ensure the high-efficiency thermal cycle under the conventional displacement of the thermal cycle of the existing geothermal well, further improves the underground heat exchange efficiency, and effectively prolongs the production life of the geothermal well . It solves the technical problem of low efficiency of using underground heat energy by geothermal wells, expands the fields and workload involved in the use of underground heat energy by geothermal wells, and effectively reduces the cost of using underground heat energy by geothermal wells.

[0042] The technical scheme adopted in the present invention is:

[0043] A geothermal well heat circulation system, the specific steps are:

[0044] Step 1 Select a well location in the geothermal accumulation a...

Embodiment 2

[0060] Based on the above-mentioned embodiment, in this embodiment, in the step 12, the specific steps of the cycle are:

[0061] Step 1: The injected circulating brine enters the No. 1 wellbore 1 through the uncoupled tubing 401;

[0062] Step 2: The circulating brine reaches the bottom of the No. 1 wellbore 1, enters the annulus between the casing 5 and the uncoupled tubing 401, and returns upward;

[0063] Step 3: The returned circulating brine passes through the tubing 4 and the annulus of the No. 2 wellbore 2, and reaches the bottom of the No. 2 wellbore 2;

[0064] Step 4: The circulating brine after reaching the bottom of No. 2 well hole 2 passes through the tubing 4 and flows back upwards;

[0065] Step 5: The circulating brine after flowback passes through the annulus between the tubing 4 and the No. 3 wellbore 3, and enters the bottom of the No. 3 wellbore 3;

[0066] Step 6: The circulating brine that reaches the bottom of No. 3 borehole 3 flows back upwards to the ...

Embodiment 3

[0077] On the basis of the foregoing embodiments, the specific steps adopted in this embodiment are as follows:

[0078] 1. Select a well location in the geothermal enrichment area;

[0079] 2. Use a Φ346mm drill bit to start drilling (first opening), drill 500 meters, and pull out the drill;

[0080] Drill structure:

[0081] Φ346mm drill bit + Φ203mm screw + Φ195mm non-magnetic drill collar + MWD + 3 Φ203mm drill collars + 15 Φ177.8mm drill collars + Φ88.9mm heavy drill pipe (15 pieces) + Φ88.9mm drill pipe

[0082] Among them, drill pressure: 120-180KN revolution: 50-60+ screw pump pressure: 5-6MPa

[0083] Displacement: 38-42L / S

[0084] 3. Lower the Φ273.3mm casing, inject cement slurry into the casing for circulation, consolidate the Φ273.3mm casing and the formation together, and wait for 12-24 hours. Cement slurry properties: density 1.75g / cm 3 Initial consistency: <30 Bc

[0085] 4. Secondary spud drilling with Φ241.3mm drill bit,

[0086] Drill structure:

...

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Abstract

The invention provides a geothermal well heat circulation system, specifically drilling a three-branched horizontal branch well in a geothermal-rich area, running casing and injecting cement respectively, and consolidating the casing and the formation together. Drill 3,000 meters in the geothermal layer respectively; run the tubing in the three wellbores, suspend and isolate the completion of the well, the purpose is to prolong the circulation distance of the injected circulating brine (saturated brine) in the geothermal layer and time, increase the heat exchange rate of injected circulating brine, and obtain more geothermal energy.

Description

technical field [0001] The invention relates to the technical field of adopting underground heat energy by geothermal wells, in particular to a thermal circulation system of geothermal wells. Background technique [0002] Geothermal is a cheap, clean and abundant new energy. Exploration studies have shown that many areas have abundant low-temperature geothermal resources. At present, the main way to obtain heat is to extract underground hot water. Statistics show that the number of underground hot water exploitation wells And the total amount of water extraction is increasing year by year, causing the water level of hot water wells to continue to decline, and even affecting land subsidence in some areas. In order to ensure the rational use of geothermal clean energy, research on underground heat energy exchange technology is carried out. [0003] On the basis of the research on underground heat exchange technology, there are two thermal circulation methods as follows: one i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B7/06E21B43/00E21B43/30E21B33/14
CPCE21B7/04E21B7/046E21B7/06E21B33/14E21B43/00E21B43/305F24T10/17Y02E10/10
Inventor 杨博孙亚莉
Owner BC P INC CHINA NAT PETROLEUM CORP
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