CN104986993A - Low-heat-conduction cement mortar used for geothermal well formation and preparation method thereof - Google Patents
Low-heat-conduction cement mortar used for geothermal well formation and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000011083 cement mortar Substances 0.000 title abstract description 8
- 230000015572 biosynthetic process Effects 0.000 title abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 114
- 239000004568 cement Substances 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims description 26
- 239000013530 defoamer Substances 0.000 claims description 24
- 239000012745 toughening agent Substances 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims description 14
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical group CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 14
- -1 aluminium chlorohydroxide Chemical compound 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- 238000009775 high-speed stirring Methods 0.000 claims description 10
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 8
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 8
- 229960001866 silicon dioxide Drugs 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 239000012467 final product Substances 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000005338 heat storage Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 239000002518 antifoaming agent Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000004005 microsphere Substances 0.000 abstract 1
- 238000005065 mining Methods 0.000 abstract 1
- 239000012744 reinforcing agent Substances 0.000 abstract 1
- 239000003129 oil well Substances 0.000 description 14
- 239000008186 active pharmaceutical agent Substances 0.000 description 13
- 239000011440 grout Substances 0.000 description 11
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 239000012153 distilled water Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000004886 process control Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 230000000704 physical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a low-heat-conduction cement mortar used for geothermal well formation and a preparation method thereof. The cement mortar comprises the following components by weight: 100 parts of cement, 5 to 30 parts of low-heat-conduction microsphere, 10 to 30 parts of a reinforcing agent, 4.5 to 6 parts of a fluid loss agent, 0.5 to 1 part of an early-strength agent, 0.2 to 0.5 part of an antifoaming agent and 44 to 65 parts of water. The low-heat-conduction cement mortar used for geothermal well formation has the advantages of good system stability, small leak-off water amount and a low heat conduction coefficient; the cement mortar has high compressive strength and fast strength development; set cement formed by the cement mortar has high strength; the heat conduction coefficient of the set cement can be reduced while requirements on well cementation are met; temperature loss of heat-storage output water in the process of travelling to a well head during mining of the geothermal well can be decreased while effective water seal is realized, so the utilization rate of geothermal resources is increased; and the cement mortar is applicable to the technical field of development of the geothermal resources, especially to well cementation and water seal of a geothermal well technically requiring reduction in heat loss in a wellhole.
Description
Technical field
The invention belongs to Development of Geothermal Resources technical field, be specifically related to a kind of low heat-conductive water mud for underground heat Cheng Jing, also relate to a kind of preparation method of the low heat-conductive water mud for underground heat Cheng Jing simultaneously.
Background technology
Geothermal energy resources are the green energy resources widelyd popularize 21 century, and develop geothermal energy resources for alleviation China energy-intensive situation, restructure the use of energy, develop a circular economy, Resources for construction saving type, environmentally friendly harmonious society tool are of great significance.Geothermal well is to adopt the thermosteresis in water process in pit shaft essential, heat storage buried depth, Wellbore Temperature Field determine the calorific loss in pit shaft, often in order to meet requirement of engineering, on ground, heat pump temperature raising is carried out to production water, geothermal well water yield per day is high, and the thermosteresis reduced in pit shaft has good economic benefit while raising geothermal energy resources utilization ratio.
Domestic and international at present still rarely have report for the heat-insulating technique research in geothermal well pit shaft, how to ensure after thermal conductivity to need to carry out deep research in cement strength etc. at reduction Behavior of Hardened Cement Paste thermal conductivity and reducing, adding of low thermally conductive material easily causes grout slurry unstable, the water mudrock structure formed after solidification is uneven, weaken, has a strong impact on cementing quality.Simultaneously because low thermally conductive material dosage sensitivity causes strength of cement grout to develop and slowly, directly affects cementing quality.Therefore, necessary exploitation low thermal conductivity, the mortar architecture that ultimate compression strength is high, at utmost reduce the calorific loss in production water pit shaft under the prerequisite meeting construction quality.
Summary of the invention
The object of this invention is to provide a kind of low heat-conductive water mud for underground heat Cheng Jing.
Second object of the present invention is to provide a kind of preparation method of the low heat-conductive water mud for underground heat Cheng Jing.
In order to realize above object, the technical solution adopted in the present invention is: a kind of low heat-conductive water mud for underground heat Cheng Jing, comprises the component of following parts by weight: cement 100 parts, low heat conduction microballoon 5 ~ 30 parts, toughener 10 ~ 30 parts, water retaining 4.5 ~ 6 parts, hardening accelerator 0.5 ~ 1 part, defoamer 0.2 ~ 0.5 part, 44 ~ 65 parts, water.
Described cement is API G level oil well cement.
Described low heat conduction microballoon is ceramic hollow ball.
The tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide.
The median size of described low heat conduction microballoon is 40 ~ 200 μm.
Filling with inert gas in described low heat conduction microballoon.
Described toughener is fineness>=600m
2the superfine cement of/Kg.
Described water retaining is the aqueous solution of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer (AMPS); The molecular weight of described copolymer is 100 ~ 1,500,000; In the described aqueous solution, the mass concentration of copolymer is 8% ~ 12%.
Described hardening accelerator be in thiosulfuric acid aluminium, water glass, aluminium chlorohydroxide any one or multiple.
Described defoamer is tributyl phosphate.
A preparation method for the above-mentioned low heat-conductive water mud for underground heat Cheng Jing, comprises the following steps:
1) get cement, low heat conduction microballoon and toughener, mix, obtain powder;
2) by step 1) gained powder adds in the water of formula ratio, then adds water retaining and hardening accelerator successively, after high-speed stirring, add defoamer, mix, to obtain final product.
Step 2) in, the rotating speed of described high-speed stirring is 8000 ~ 12000r/min, and churning time is 40 ~ 80s.
Of the present invention in the low heat-conductive water mud of underground heat Cheng Jing, the effect of each component in mortar architecture is as follows:
Low heat conduction microballoon: the principle of design of low heat-conductive water mud system for add low thermally conductive material extra material in concrete grey, thus reduces the thermal conductivity of mortar architecture.Low heat conduction microballoon is the low density heat preserving and insulating material of a kind of thermal conductivity extremely low (thermal conductivity is 0.08 ~ 0.1w/ (m.k)), also be the light-weight additive that oil gas well cementing operation cement is conventional, itself there is higher ultimate compression strength and hardness, less on the ultimate compression strength impact of Behavior of Hardened Cement Paste; It makes grout have lower thermal conductivity after adding mortar architecture.
Toughener: i.e. superfine cement, on the basis of oil well cement grog, the degree of depth is levigate, the change mainly due to fineness in performance, result in aquation aggravation and causes the change of grout physical properties.This cement clinker has rational grain composition, specific surface area>=600m
2, can not only there is solidifying rigid reaction in/Kg, also can filling water mudstone hole further in grout, forms finer and close Behavior of Hardened Cement Paste, can increase low-density cement mortar ultimate compression strength, improve Mechanical Behavior of Hardened Cement Paste.
Water retaining: control grout filtrate to stratum permeation effects to cement slurry property.
Hardening accelerator: the early strength improving grout, shortens the thickening time of low heat-conductive water mud.
Defoamer: the grout prepared under high velocity agitation can produce a lot of bubble, if be solidified into mould when bubble does not dissipate, can affect the intensity of Behavior of Hardened Cement Paste.Defoamer can reduce surface tension, eliminates the bubble in grout.
Low heat-conductive water mud for underground heat Cheng Jing of the present invention, by cement, low heat conduction microballoon, toughener, water retaining, hardening accelerator, defoamer and water is composite forms, there is system stability good, the advantage that the leak-off water yield is low and thermal conductivity is low, ultimate compression strength is high, strength development is fast, formation cement strength is high, the thermal conductivity of Behavior of Hardened Cement Paste can be reduced while meeting cementing operation, geothermal well heat storage production water in employing process can be reduced while effective sealing and arrive the temperature loss in well head process, improve geothermal energy resources utilization ratio, be applicable to Development of Geothermal Resources technical field, be particularly useful for having well cementation and the sealing operation of the geothermal well of technical need to reducing calorific loss in pit shaft.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present invention, first cement, low heat conduction microballoon and toughener are mixed into powder, after again powder being mixed with water, water retaining and hardening accelerator, finally to add defoamer to mix and make, this preparation method's gained grout is adopted to have the advantage that system stability is good, the leak-off water yield is low and thermal conductivity is low, Compressive Strength is high, strength development is fast, forms cement strength high; This preparation method's technique is simple, easy to operate, can be now with the current at the construction field (site), and cost is low, has broad application prospects.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 10 parts, toughener 10 parts, water retaining 4.5 parts, hardening accelerator 0.75 part, defoamer 0.2 part, 48 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 50 μm; Described toughener is fineness is 600m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 10%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,000,000; Described hardening accelerator is thiosulfuric acid aluminium; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and thiosulfuric acid aluminium (the reinforced process control of water retaining and thiosulfuric acid aluminium is within 30s) more successively fast, after the rotating speed high-speed stirring 60s of 10000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Embodiment 2
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 5 parts, toughener 10 parts, water retaining 4.5 parts, hardening accelerator 1 part, defoamer 0.2 part, 44 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 100 μm; Described toughener is fineness is 650m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 8%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,500,000; Described hardening accelerator is water glass; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and water glass (the reinforced process control of water retaining and water glass is within 30s) more successively fast, after the rotating speed high-speed stirring 80s of 8000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Embodiment 3
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 15 parts, toughener 15 parts, water retaining 5 parts, hardening accelerator 0.9 part, defoamer 0.25 part, 54 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 150 μm; Described toughener is fineness is 700m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 12%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,100,000; Described hardening accelerator is aluminium chlorohydroxide; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and aluminium chlorohydroxide (the reinforced process control of water retaining and aluminium chlorohydroxide is within 30s) more successively fast, after the rotating speed high-speed stirring 40s of 12000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Embodiment 4
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 20 parts, toughener 25 parts, water retaining 5.4 parts, hardening accelerator 0.8 part, defoamer 0.3 part, 58 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 200 μm; Described toughener is fineness is 750m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 10%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,300,000; Described hardening accelerator is thiosulfuric acid aluminium, the mass ratio of water glass, aluminium chlorohydroxide is the mixture of 1:1:1; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and thiosulfuric acid aluminium, water glass, aluminium chlorohydroxide (the reinforced process control of water retaining and thiosulfuric acid aluminium, water glass, aluminium chlorohydroxide is within 30s) more successively fast, after the rotating speed high-speed stirring 40s of 10000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Embodiment 5
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 25 parts, toughener 20 parts, water retaining 5.8 parts, hardening accelerator 0.6 part, defoamer 0.5 part, 60 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 40 μm; Described toughener is fineness is 800m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 10%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,400,000; Described hardening accelerator is the mass ratio of thiosulfuric acid aluminium and water glass is the mixture of 10:1; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and thiosulfuric acid aluminium, water glass (the reinforced process control of water retaining and thiosulfuric acid aluminium, water glass is within 30s) more successively fast, after the rotating speed high-speed stirring 60s of 12000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Embodiment 6
The low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the component of following parts by weight: API G level oil well cement 100 parts, low heat conduction microballoon 30 parts, toughener 30 parts, water retaining 6 parts, hardening accelerator 0.5 part, defoamer 0.4 part, 65 parts, water.
Wherein, the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide, interior filling with inert gas, median size is 100 μm; Described toughener is fineness is 600m
2the superfine cement of/Kg; Described water retaining is the aqueous solution (mass concentration is 10%) of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer, and the molecular weight of copolymer is 1,200,000; Described hardening accelerator is the mass ratio of thiosulfuric acid aluminium and aluminium chlorohydroxide is the mixture of 1:10; Described defoamer is tributyl phosphate.
The preparation method of the low heat-conductive water mud for underground heat Cheng Jing of the present embodiment, comprises the following steps:
1) get the API G level oil well cement of formula ratio, low heat conduction microballoon and superfine cement and be placed in dry-mixed machine mix and blend 3min to mixing, obtain powder;
2) distilled water getting formula ratio is placed in high speed agitator, stir with the rotating speed of 3000r/min, slowly add step 1) gained powder, add water retaining and thiosulfuric acid aluminium, aluminium chlorohydroxide (the reinforced process control of water retaining and thiosulfuric acid aluminium, aluminium chlorohydroxide is within 30s) more successively fast, after the rotating speed high-speed stirring 60s of 8000r/min, add the tributyl phosphate of formula ratio, mix, obtain described low heat-conductive water mud.
Experimental example
This experimental example carries out Performance Detection to the low heat-conductive water mud that embodiment 1 ~ 6 gained is used for underground heat Cheng Jing.
Experimental technique: by GB/T 19139-2003 standard system for grout, evaluation initial consistency, thickening time, free liquid, the leak-off water yield and ultimate compression strength etc.; Adopt the TC 3000 serial thermal conductivity instrument test water mudstone thermal conductivity of Xi'an Xiatech Electronic Technology Co., Ltd..
Detected result is as shown in table 1.
Wherein, the cement-slurry method of comparative example is: G class g cement 100 parts, toughener 5 parts, water retaining 4 parts, defoamer 0.2 part, 44 parts, water.Wherein, toughener, water retaining and defoamer are with embodiment 1.
Table 1 embodiment 1 ~ 6 gained is used for the low heat-conductive water mud property detected result of underground heat Cheng Jing
As can be seen from Table 1, embodiment 1 ~ 6 gained is used for the ultimate compression strength >=8MPa of the low heat-conductive water mud of underground heat Cheng Jing, meet the requirement of strength of Behavior of Hardened Cement Paste, and thermal conductivity is well below comparative example.Experimental result shows, the low heat-conductive water mud for underground heat Cheng Jing of the application, and have the advantage that system stability is good, the leak-off water yield is low and thermal conductivity is low, Compressive Strength is high, strength development is fast, forms cement strength high.
Claims (10)
1. for a low heat-conductive water mud of underground heat Cheng Jing, it is characterized in that: the component comprising following parts by weight: cement 100 parts, low heat conduction microballoon 5 ~ 30 parts, toughener 10 ~ 30 parts, water retaining 4.5 ~ 6 parts, hardening accelerator 0.5 ~ 1 part, defoamer 0.2 ~ 0.5 part, 44 ~ 65 parts, water.
2. the low heat-conductive water mud for underground heat Cheng Jing according to claim 1, is characterized in that: the tiny balloon of described low heat conduction microballoon to be main component be silicon-dioxide, aluminium sesquioxide.
3. the low heat-conductive water mud for underground heat Cheng Jing according to claim 2, is characterized in that: the median size of described low heat conduction microballoon is 40 ~ 200 μm.
4. the low heat-conductive water mud for underground heat Cheng Jing according to Claims 2 or 3, is characterized in that: filling with inert gas in described low heat conduction microballoon.
5. the low heat-conductive water mud for underground heat Cheng Jing according to claim 1, is characterized in that: described toughener is fineness>=600m
2the superfine cement of/Kg.
6. the low heat-conductive water mud for underground heat Cheng Jing according to claim 1, is characterized in that: described water retaining is the aqueous solution of 2-acrylamide-2-methyl propane sulfonic and acrylic acid copolymer; The molecular weight of described copolymer is 100 ~ 1,500,000; In the described aqueous solution, the mass concentration of copolymer is 8% ~ 12%.
7. the low heat-conductive water mud for underground heat Cheng Jing according to claim 1, is characterized in that: described hardening accelerator be in thiosulfuric acid aluminium, water glass, aluminium chlorohydroxide any one or multiple.
8. the low heat-conductive water mud for underground heat Cheng Jing according to claim 1, is characterized in that: described defoamer is tributyl phosphate.
9., as claimed in claim 1 for a preparation method for the low heat-conductive water mud of underground heat Cheng Jing, it is characterized in that: comprise the following steps:
1) get cement, low heat conduction microballoon and toughener, mix, obtain powder;
2) by step 1) gained powder adds in the water of formula ratio, then adds water retaining and hardening accelerator successively, after high-speed stirring, add defoamer, mix, to obtain final product.
10. the preparation method of the low heat-conductive water mud for underground heat Cheng Jing according to claim 9, is characterized in that: step 2) in, the rotating speed of described high-speed stirring is 8000 ~ 12000r/min, and churning time is 40 ~ 80s.
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| CN107216071A (en) * | 2017-05-16 | 2017-09-29 | 西安浩沃新能源有限公司 | A kind of deep geothermal heat well low-temperature zone well cementation insulating cement slurry and preparation method thereof |
| CN109095822A (en) * | 2017-06-21 | 2018-12-28 | 中国石油化工股份有限公司 | A kind of low-density antileak cement composition, low-density Antileakage Cement Slurry and preparation method thereof |
| CN111499300A (en) * | 2020-04-23 | 2020-08-07 | 东南大学 | Energy-saving heat-conducting composite material and preparation method and application thereof |
| CN112094091A (en) * | 2020-10-30 | 2020-12-18 | 成都欧美克石油科技股份有限公司 | Large-temperature-difference low-heat-conductivity cement slurry suitable for long-sealing-section well cementation |
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| CN109095822A (en) * | 2017-06-21 | 2018-12-28 | 中国石油化工股份有限公司 | A kind of low-density antileak cement composition, low-density Antileakage Cement Slurry and preparation method thereof |
| CN111499300A (en) * | 2020-04-23 | 2020-08-07 | 东南大学 | Energy-saving heat-conducting composite material and preparation method and application thereof |
| CN111499300B (en) * | 2020-04-23 | 2022-07-01 | 东南大学 | Energy-saving heat-conducting composite material and preparation method and application thereof |
| CN112094091A (en) * | 2020-10-30 | 2020-12-18 | 成都欧美克石油科技股份有限公司 | Large-temperature-difference low-heat-conductivity cement slurry suitable for long-sealing-section well cementation |
| CN112321219A (en) * | 2020-12-10 | 2021-02-05 | 嘉华特种水泥股份有限公司 | Heat-preservation well cementation cement system for dry hot rock production well |
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