CN109652028A - A kind of drilling fluid temperature control method based on phase-change material - Google Patents
A kind of drilling fluid temperature control method based on phase-change material Download PDFInfo
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- CN109652028A CN109652028A CN201811635450.2A CN201811635450A CN109652028A CN 109652028 A CN109652028 A CN 109652028A CN 201811635450 A CN201811635450 A CN 201811635450A CN 109652028 A CN109652028 A CN 109652028A
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- 239000012782 phase change material Substances 0.000 title claims abstract description 121
- 238000005553 drilling Methods 0.000 title claims abstract description 118
- 239000012530 fluid Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 239000000654 additive Substances 0.000 claims abstract description 6
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 230000005713 exacerbation Effects 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 46
- 230000009466 transformation Effects 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 239000012188 paraffin wax Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 10
- 238000005338 heat storage Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 229910021389 graphene Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 6
- 238000003760 magnetic stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- UNXHWFMMPAWVPI-UHFFFAOYSA-N Erythritol Natural products OCC(O)C(O)CO UNXHWFMMPAWVPI-UHFFFAOYSA-N 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- UNXHWFMMPAWVPI-ZXZARUISSA-N erythritol Chemical compound OC[C@H](O)[C@H](O)CO UNXHWFMMPAWVPI-ZXZARUISSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000000844 transformation Methods 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 208000012826 adjustment disease Diseases 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000010257 thawing Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002860 competitive effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 57
- 238000001816 cooling Methods 0.000 description 13
- 238000007493 shaping process Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 4
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 4
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DCXXMTOCNZCJGO-UHFFFAOYSA-N tristearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 2
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 1
- 101100008047 Caenorhabditis elegans cut-3 gene Proteins 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000269793 Cryothenia peninsulae Species 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/062—Arrangements for treating drilling fluids outside the borehole by mixing components
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Organic Chemistry (AREA)
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- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- General Chemical & Material Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The drilling fluid temperature control method based on phase-change material that the present invention relates to a kind of.Its technical solution is: the following steps are included: the phase-change material that (1) preferably drilling fluid is used: (2) can be added before exacerbation using phase-change material as additive for drilling fluid when configuring drilling fluid, and dosage is the 5%-15% of drilling fluid total weight；Or be added in drilling with the concentration that 5-15 kilograms is added in every cubic meter of drilling fluid, after cycle balance, it can be crept into, bottom hole temperature (BHT) is different, the concentration of the phase-change material of addition is different, the circulation of drilling fluid temperature until reaching needs, no more than the 20% of total drilling mud weight；(3) drilling well terminates, can be by phase-change material recycling and reusing.Beneficial effect is: during circulation of drilling fluid, phase-change material can constantly absorb and release suitable thermal energy；Phase-change material can be recycled simultaneously with other additive for drilling fluid；It is non-maintaining；It is not required to power consumption, environmental protection；It is competitive in economic benefit.
Description
Technical field
The present invention relates to drilling safety and domain of control temperature, in particular to a kind of drilling fluid temperature based on phase-change material
Control method.
Background technique
With emerging energy constantly discover and to the increase of energy demand and the development of petroleum drilling technology, deep-well,
Ultradeep well, geothermal well, xeothermic well and the probing of gas hydrates well have become the importance of well drilling industry development, to drilling fluid
More stringent requirements are proposed.During deep-well and ultra-deep well drilling, formation temperature increases with depth and is increased, and general every 100
M geothermal gradient is 3 DEG C, and by taking 6000 ~ 7000m deep-well as an example, bottom hole temperature (BHT) is up to 180 ~ 210 DEG C of (China's oil natural gas storages
The main force of amount takes over area -- and the temperature of the Deep Basins reservoir such as loose the Liao Dynasty, Bohai Sea Gulf, Tarim Basin, Zhunger Basin and Sichuan is up to 200~
260 DEG C).Geothermal well, hot dry rock well temperature generally at 200 DEG C or more.Formation temperature raising will cause circulating fluid temperature
It increases, drilling fluid temperature is excessively high not only to influence itself performance, has an effect on down-hole equipment and is oriented to the environment temperature of testing tool
And service life, influence rate of penetration and borehole wall stability.In frozen soil layer drilling well and gas hydrates drilling well, if drilling fluid
Temperature is higher than frozen soil layer or gas hydrates reservoir temperature, then will cause frozen soil section or frozen section is expanding or gas water
Object shaft bottom is closed to decompose.Therefore, it cools down drilling fluid in time in drillng operation to make up to suitable temperature very necessary.
In drilling process, the cool-down method of drilling fluid is generally to take following measures: (1) drilling well using physics cooling method
Liquid natural cooling.This complete climate condition of the type of cooling influences, unknown for deep-well, ultradeep well and hp-ht well effect
It is aobvious, requirement of the safety drilling to circulating fluid temperature is then unable to reach to gas hydrates well.(2) cryogenic media mixing is cold
But.Low-temperature solid (such as ice cube) or liquid are launched into drilling fluid pot, so that drilling fluid is cooled down by mixing heat exchange pattern.This
The case where kind method is generally used for the cooling of water-base drilling fluid and is easy to get low-temperature water source can only use as emergency plan.
(3) cooling device forces cooling.When return out drilling fluid temperature it is excessively high when, need to using Drilling Fluid Cooling System force cooling.Drilling well
For the working principle of liquid cooling system based on air-cooled, spray and interactive mode exchange heat in a manner of 3 kinds, this method needs traditional refrigeration
The large scale equipments such as equipment, such as powerful fan, spray equipment, heat exchanger, not only power consumption, but also not environmentally.The above
Method all only from drilling fluid inlet temperature is reduced, reduces the circulating temperature of drilling fluid indirectly.
Summary of the invention
The purpose of the present invention is to drawbacks described above of the existing technology, provide a kind of drilling well based on phase-change material
Liquid temprature control method can directly control circulation of drilling fluid temperature in pit shaft.
A kind of drilling fluid temperature control method based on phase-change material that the present invention mentions, technical solution is: including with
Lower step:
(1) phase-change material of suitable phase transition temperature, phase transition temperature the phase-change material of preferred drilling fluid: are selected according to bottom hole temperature (BHT)
Point should select on the certain point of pit shaft circulating temperature, and the phase transition temperature of phase-change material closer to bottom hole temperature (BHT), get over by temperature control effect
Good, latent heat of phase change is greater than 160kJ/kg；
It (2), can be solid with other non-polymeric species when configuring drilling fluid using preferred phase-change material as additive for drilling fluid
Body particle is added before exacerbation, and dosage is the 5%-15% of drilling fluid total weight；Or in drilling with every cubic meter of drilling fluid
The middle concentration for being added 5-15 kilograms is added, and after cycle balance, can be crept into, phase-change material concentration is with every cubic meter of drilling fluid
Dry phase-change material weight is added to calculate, bottom hole temperature (BHT) is different, and the concentration of the phase-change material of addition is different, until reaching needs
Circulation of drilling fluid temperature, but the 20% of no more than total drilling mud weight；When the drilling fluid added with phase-change material is followed from well head
During ring to shaft bottom, formation temperature is gradually risen, and when reaching phase transition temperature, phase-change material is undergone phase transition, and absorbs drilling fluid
In heat, reduce the circulating temperature of drilling fluid；The heat storage of absorption is in phase-change material, and the temperature of material itself is in phase transformation
It almost remains unchanged before completing, generates a wide temperature platform；After drilling fluid is recycled to well head from shaft bottom, approach ground is followed
When the external environments such as annular groove, sedimentation basin, purification system, mud pit, temperature is gradually decreased, when down to phase transition temperature, phase-change material
It undergoes phase transition again, releases heat, a large amount of heat of transformations are transferred in external environment with drilling fluid, then phase-change material follows
Drilling fluid enters drilling pump Recycling；
(3) drilling well terminates, can be by phase-change material recycling and reusing.
Preferably, above-mentioned phase-change material can be applied to the exploitation of high temperature well and low temperature well resource, the phase transformation of phase-change material
Temperature is preferably between -20 DEG C to 500 DEG C.
Further, the phase-change material that the preferred phase transition temperature of low temperature well is -5 DEG C to 10 DEG C.
Further, the preferred phase transition temperature of high temperature well is the phase-change material between 70 DEG C to 150 DEG C.
Further, the phase-change material can use crystalline hydrate, fuse salt, metal alloy, paraffin, carboxylic acid, ester
Or polymeric alcohol, shaping phase-change material, microencapsulated phase change material or composite phase-change material can also be used.
Preferably, the shaping phase-change material that the present invention mentions is prepared by the following method:
(1) 7.5g high density heat storage phase-changing material, phase change paraffin or antierythrite are placed in drying box and are heated to whole thawings,
Magnetic stirring apparatus is opened to higher than 5 DEG C of preheating 5min of fusion temperature simultaneously；
(2) the high density heat storage phase-changing material being completely melt is placed on magnetic stirring apparatus, stirring rate 120r/min, is waited
All watery fusions into liquid；
(3) stirring rate increases to 280r/min, is slowly added to 2g expanded graphite by several times；
(4) stop stirring 20s, exhaust continues to stir later, stirring rate 400-450r/min, at interval of 5min, stops
20s；
(5) step (4) are repeated, mixing time stops after amounting to 1h；
(6) by graphene oxide solution, the effective content of graphene oxide is 0.5g, is slowly dropped into, and stirs 2.5h, stirring speed
Rate is 450 r/min, is reacted with pH=9 of the triethanolamine aqueous solution adjustment reaction solution of 10wt% with terminating, with filter paper mistake
Filter, and it is multiple with 50 DEG C of distillation water washing, 48h is dried in vacuo at 35 DEG C.
The beneficial effects of the present invention are: the present invention absorbs when undergoing phase transition using phase-change material or releases latent heat and temperature
Spend the characteristic that remains unchanged, the phase-change material of the certain phase transition temperature of certain amount added in drilling fluid, when circulation of drilling fluid extremely
It when pit shaft, as the temperature rises, undergoes phase transition, absorbs a large amount of latent heat, store energy in phase-change material, material itself
Temperature phase transformation complete before almost remain unchanged, generate a wide temperature platform.When circulation of drilling fluid goes out pithead position, temperature
Degree reduces, and phase-change material undergoes phase transition again, releases heat, a large amount of heat of transformations are transferred in external environment, to reach
Reduce the purpose of circulating fluid temperature in pit shaft；
The characteristics of the method, is, during circulation of drilling fluid, phase-change material can constantly absorb and release suitable thermal energy；
Phase-change material can be recycled simultaneously with other additive for drilling fluid；It is non-maintaining；It is not required to power consumption, environmental protection；In economic benefit
It is competitive.
Detailed description of the invention
Attached drawing 1 is well bore temperature distribution schematic diagram after circulation of drilling fluid 2 weeks；
Attached drawing 2 be shaping phase-change material dosage be 0.6kg/min when Wellbore Temperature Field；
Attached drawing 3 be shaping phase-change material dosage be 3.6kg/min when Wellbore Temperature Field；
Attached drawing 4 be shaping phase-change material dosage be 4.8kg/min when Wellbore Temperature Field；
Attached drawing 5 be phase change paraffin phase transition temperature be 60 DEG C when Wellbore Temperature Field；
Attached drawing 6 be phase change paraffin phase transition temperature be 100 DEG C when Wellbore Temperature Field；
Attached drawing 7 be phase change paraffin phase transition temperature be 120 DEG C when Wellbore Temperature Field；
Attached drawing 8 is Wellbore Temperature Field when antierythrite is added
Attached drawing 9 is Wellbore Temperature Field when polyethylene is added
Attached drawing 10 is different phase change material temperature lowering temperature-time curves
Attached drawing 11 is that 10% phase change materials temperature time curve is added；
Attached drawing 12 is that 10% magnesium chloride hexahydrate temperature lowering curve is added.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment 1: a kind of drilling fluid temperature control method based on phase-change material that the present invention mentions, technical solution
It is: the following steps are included:
(1) phase-change material of suitable phase transition temperature, phase transition temperature the phase-change material of preferred drilling fluid: are selected according to bottom hole temperature (BHT)
Point should select on the certain point of pit shaft circulating temperature, and the phase transition temperature of phase-change material closer to bottom hole temperature (BHT), get over by temperature control effect
Good, latent heat of phase change is greater than 160kJ/kg；
It (2), can be solid with other non-polymeric species when configuring drilling fluid using preferred phase-change material as additive for drilling fluid
Body particle is added before exacerbation, and dosage is the 5%-15% of drilling fluid total weight；Or in drilling with every cubic meter of drilling fluid
The middle concentration for being added 5-15 kilograms is added, and after cycle balance, can be crept into, phase-change material concentration is with every cubic meter of drilling fluid
Dry phase-change material weight is added to calculate, bottom hole temperature (BHT) is different, and the concentration of the phase-change material of addition is different, until reaching needs
Circulation of drilling fluid temperature, but the 20% of no more than total drilling mud weight；When the drilling fluid added with phase-change material is followed from well head
During ring to shaft bottom, formation temperature is gradually risen, and when reaching phase transition temperature, phase-change material is undergone phase transition, and absorbs drilling fluid
In heat, reduce the circulating temperature of drilling fluid；The heat storage of absorption is in phase-change material, and the temperature of material itself is in phase transformation
It almost remains unchanged before completing, generates a wide temperature platform；After drilling fluid is recycled to well head from shaft bottom, approach ground is followed
When the external environments such as annular groove, sedimentation basin, purification system, mud pit, temperature is gradually decreased, when down to phase transition temperature, phase-change material
It undergoes phase transition again, releases heat, a large amount of heat of transformations are transferred in external environment with drilling fluid, then phase-change material follows
Drilling fluid enters drilling pump Recycling；
(3) drilling well terminates, can be by phase-change material recycling and reusing.
Preferably, above-mentioned phase-change material can be applied to the exploitation of high temperature well and low temperature well resource, the phase transformation of phase-change material
Temperature is preferably between -20 DEG C to 500 DEG C.
Further, the phase-change material that the preferred phase transition temperature of low temperature well is -5 DEG C to 10 DEG C.
Further, the preferred phase transition temperature of high temperature well is the phase-change material between 70 DEG C to 150 DEG C.
Further, the phase-change material can use crystalline hydrate, fuse salt, metal alloy, paraffin, carboxylic acid, ester
Or polymeric alcohol, shaping phase-change material, microencapsulated phase change material or composite phase-change material can also be used.
Preferably, the shaping phase-change material that the present invention mentions is prepared by the following method:
(1) 7.5g high density heat storage phase-changing material, phase change paraffin or antierythrite are placed in drying box and are heated to whole thawings,
Magnetic stirring apparatus is opened to higher than 5 DEG C of preheating 5min of fusion temperature simultaneously；
(2) the high density heat storage phase-changing material being completely melt is placed on magnetic stirring apparatus, stirring rate 120r/min, is waited
All watery fusions into liquid；
(3) stirring rate increases to 280r/min, is slowly added to 2g expanded graphite by several times；
(4) stop stirring 20s, exhaust continues to stir later, stirring rate 400-450r/min, at interval of 5min, stops
20s；
(5) step (4) are repeated, mixing time stops after amounting to 1h；
(6) by graphene oxide solution, the effective content of graphene oxide is 0.5g, is slowly dropped into, and stirs 2.5h, stirring speed
Rate is 450 r/min, is reacted with pH=9 of the triethanolamine aqueous solution adjustment reaction solution of 10wt% with terminating, with filter paper mistake
Filter, and it is multiple with 50 DEG C of distillation water washing, 48h is dried in vacuo at 35 DEG C.
Specific example is as follows:
By the way that influence of the shaping phase-change material of different quality to temperature in wellbore is added
The live drilling well basic data of SHB5-4H well is applied in transient state bore temperature model, has carried out three and spud in proceed to
Bored shaft characteristic analysis of temperature field at 7300m.
(1) basic data: temperature is 25 DEG C；Geothermal gradient is 2 DEG C/100m
(2) casing programme
1 SHB5-4H casing programme of table
(3) drill assembly
8 1/2 " the PDC+1.5 ° of 172mm screw rod+bonded head+6 1/4 of variable buckle 411*4A11+ ball-and-seat+seat " non magnetic drill collar * 1+
215mm centralizer+6 1/4 " 20+connector of drill collar * 4A11*410+5 " aggravates * 13+connector 411*NC520+5 " drilling rod * 219
Root+1/2 " drilling rod of connector NC521*DS550+5
(4) property of drilling fluid
1.30 g/cm3 of density, viscosity 59S, quiet to cut 3/7Pa, dehydration 3.6mL/0.5 mm, 24mPa.S, yield value 7Pa are glued in modeling,
HTHP:9.8 ml(120 DEG C), admittedly contain 13%, contain sand 0.1%, slope contain 34g/L, PH 9, chloride ion: 27400 mg/L, potassium ion:
15205 mg/L, calcium ion: 240 mg/L；Six speed: 62/38,28/19,5/4.
(5) job parameter
28 L/s of drilling fluid displacement, 40 rpm of revolving speed.
The effect in example is illustrated below.
(1) the temperature in wellbore section of phase-change material is not added
In the case where being added without phase-change material, the Wellbore Temperature Field after recycling two weeks (17692s) is as shown in Figure 1.Calculation result table
Bright, after two weeks, bottom hole temperature (BHT) is 144.13 DEG C to circulation, and outlet temperature is 44.76 DEG C.
(2) influence of the shaping phase-change material of different quality to temperature in wellbore is added
The phase-change material used for the shaping phase-change material of indoor synthesis, by the phase-change material of high energy storage density, expanded graphite and
Graphene combines the shaping phase-change material being prepared, and can be used as drilling fluid cooling agent, and directly addition is in drilling fluid.
Such shaping phase-change material has carried out microcosmic solid-liquid phase change in itself, but is macroscopically still maintaining stable solid-state shape
Shape.Phase transition temperature is 120 DEG C, latent heat of phase change 230J/g, and analyzing phase-change material dosage is respectively 0.6,3.6 and 4.8kg/
Wellbore Temperature Field after recycling 2 weeks when min, Wellbore Temperature Field section are shown in Fig. 2 ~ 4, and statistical result is shown in Table 2.
2 shaping phase-change material dosage of table influences bottom hole temperature (BHT) and phase change location
From Fig. 1-Fig. 4 and table 2 as can be seen that increasing with phase-change material dosage, bottom-hole circulating temperature constantly reduces, when dosage reaches
When 4.8 kg/min, bottom-hole circulating temperature is reduced to 120 DEG C, than the bottom-hole circulating temperature of phase-change material not being added to reduce 24.13
DEG C, so phase-change material can reduce circulating fluid temperature in pit shaft.
Embodiment 2, influence of the phase change paraffin of different phase transition temperatures to bottom hole temperature (BHT)
Paraffin molecule various structures, phase transition temperature are different.Using 4.2kg/min dosage, analyzing phase transition temperature is respectively 60,100
With the temperature in wellbore in the case of 120 DEG C.Wellbore Temperature Field section is shown in Fig. 5 ~ 7, and statistical result is shown in Table 3.
3 phase transition temperature of table influences bottom hole temperature (BHT) and phase change location
Phase change paraffin phase transition temperature is improved from when being increased to 120 DEG C for 60 DEG C with phase transition temperature, and bottom-hole circulating temperature constantly reduces,
It is eventually declined to 120 DEG C.
Influence of the phase-change material of essentially identical, the different heat of transformation of 3 phase transition temperature of embodiment to bottom hole temperature (BHT)
Using 4.2kg/min dosage, antierythrite (118 DEG C of phase transition temperature, heat of transformation 339.8J/g), polyethylene (phase are analyzed
120 DEG C of temperature, heat of transformation 220J/g) temperature in wellbore temperature in wellbore.
The heat of transformation shows to increase with the heat of transformation to bored shaft Analysis of Temperature Influence, and annular space outlet temperature slightly increases, well
Bottom temperature constantly reduces, but when the heat of transformation reaches after cooling material be in phase change zone in shaft bottom, improves the heat of transformation to reduction well
Cylinder temperature just no longer works.Under fusing point and dosage certain situation, there are the critical heat of transformations (bottom-hole circulating temperature to be made to be equal to fusing point
The heat of transformation needed), as long as the cooling material heat of transformation reaches this numerical value, that is, it can reach ideal cooling effect.
4 phase-change material of embodiment temperature reduction performance within 100 DEG C
Test method: it under normal pressure, in the vacuum cup containing 100 DEG C of 150ml drilling fluids (1.02 g/cm3 of density), is separately added into
15g phase-change material records temperature-time changing curve.
Experiment inorganic agent: it tests phase-change material used and is respectively as follows:
The Shanghai 1# 70A joule wax industry.70 DEG C of fusing point.
2# acetyl amine analysis is pure, the abundant Photar Fine Chemical Co., Ltd in Qingdao, and 81 DEG C of fusing point, colourless, transparent, needle-shaped knot
Crystal.
The pure .AR of 3# tristearin acid analysis, Wenzhou chemistry materials factory, 67 ~ 70 DEG C of fusing point, white leaflet crystal, insoluble in water,
It is soluble in hot ethanol.
4# TH-HC38 high thermal conductivity phase-change material, Hubei Sai Mo New Energy Technology Co., Ltd., 37 DEG C of fusing point.
5# TH-ME28 microencapsulated phase change material, Hubei Sai Mo New Energy Technology Co., Ltd., 28 DEG C of fusing point.
The wherein drilling fluid that the 0# in Figure 10 is 100 DEG C.From fig. 10 it can be seen that the addition of phase-change material can be in short-term
100 DEG C of drilling fluid can be down to 82 DEG C in 1min by the interior effect for playing cooling, such as 4#.
Application of 5 phase-change material of embodiment in oil base drilling fluid
Test method: oil base drilling fluid is squeezed into simulation drilling fluid flowing temperature-measuring control device and is recycled, is sensed by three
Device controls heating mantle, so that bottom hole temperature (BHT) is reached 180 DEG C, manually adjusts heating mantle at this time, heating power is maintained at heating mantle temperature
Constant position is spent, the automatic program of closing temperature sensor is separately added into 10% phase-change material into drilling fluid system, by temperature
Degree sensor measures bottom hole temperature (BHT), reads temperature by temperature indicator, tests temperature reduction performance.
Experiment inorganic agent: it tests phase-change material used and is respectively as follows:
Phase change materials: 149 DEG C of phase transition temperature, latent heat of phase change is 90 J/g, Beijing Tai Jin Science and Technology Ltd..
Magnesium chloride hexahydrate: phase transition temperature is 129 DEG C, latent heat of phase change 133J/g.
Can be seen that 10% phase change materials of addition from Figure 11, Figure 12 can drop to 174 from 180 DEG C for high-temperature medium
℃.10% magnesium chloride hexahydrate, which is added, can drop to 170 DEG C from 180 DEG C for high-temperature medium.Wherein, in attached drawing 11, A manual temperature
Point；Phase-change material point is added in B.Figure 12 is that 10% magnesium chloride hexahydrate temperature lowering curve, A manual temperature point is added；Phase-change material is added in B
Point.
The above, is only part preferred embodiment of the invention, and anyone skilled in the art may benefit
Equivalent technical solution is modified or is revised as with the technical solution of above-mentioned elaboration.Therefore, technology according to the present invention
Any simple modification or substitute equivalents that scheme is carried out, belong to the greatest extent the scope of protection of present invention.
Claims (6)
1. a kind of drilling fluid temperature control method based on phase-change material, it is characterized in that: the following steps are included:
(1) phase-change material of suitable phase transition temperature, phase transition temperature the phase-change material of preferred drilling fluid: are selected according to bottom hole temperature (BHT)
Point should select on the certain point of pit shaft circulating temperature, and the phase transition temperature of phase-change material closer to bottom hole temperature (BHT), get over by temperature control effect
Good, latent heat of phase change is greater than 160kJ/kg；
It (2), can be solid with other non-polymeric species when configuring drilling fluid using preferred phase-change material as additive for drilling fluid
Body particle is added before exacerbation, and dosage is the 5%-15% of drilling fluid total weight；Or in drilling with every cubic meter of drilling fluid
The middle concentration for being added 5-15 kilograms is added, and after cycle balance, can be crept into, phase-change material concentration is with every cubic meter of drilling fluid
Dry phase-change material weight is added to calculate, bottom hole temperature (BHT) is different, and the concentration of the phase-change material of addition is different, until reaching needs
Circulation of drilling fluid temperature, but the 20% of no more than total drilling mud weight；When the drilling fluid added with phase-change material is followed from well head
During ring to shaft bottom, formation temperature is gradually risen, and when reaching phase transition temperature, phase-change material is undergone phase transition, and absorbs drilling fluid
In heat, reduce the circulating temperature of drilling fluid；The heat storage of absorption is in phase-change material, and the temperature of material itself is in phase transformation
It almost remains unchanged before completing, generates a wide temperature platform；After drilling fluid is recycled to well head from shaft bottom, approach ground is followed
When the external environments such as annular groove, sedimentation basin, purification system, mud pit, temperature is gradually decreased, when down to phase transition temperature, phase-change material
It undergoes phase transition again, releases heat, a large amount of heat of transformations are transferred in external environment with drilling fluid, then phase-change material follows
Drilling fluid enters drilling pump Recycling；
(3) drilling well terminates, can be by phase-change material recycling and reusing.
2. the drilling fluid temperature control method according to claim 1 based on phase-change material, it is characterized in that: the phase transformation
Material can be applied to the exploitation of high temperature well and low temperature well resource, the phase transition temperature of phase-change material be preferably -20 DEG C to 500 DEG C it
Between.
3. the drilling fluid temperature control method according to claim 1 based on phase-change material, it is characterized in that: low temperature well is preferred
The phase-change material that phase transition temperature is -5 DEG C to 10 DEG C.
4. the drilling fluid temperature control method according to claim 1 based on phase-change material, it is characterized in that: high temperature well is preferred
Phase transition temperature is the phase-change material between 70 DEG C to 150 DEG C.
5. the drilling fluid temperature control method according to claim 1 based on phase-change material, it is characterized in that: the phase transformation material
Material can use crystalline hydrate, fuse salt, metal alloy, paraffin, carboxylic acid, ester or polymeric alcohol, can also use fixed phase change
Material, microencapsulated phase change material or composite phase-change material.
6. the drilling fluid temperature control method according to claim 5 based on phase-change material, it is characterized in that: the setting phase
Become material to be prepared by the following method:
(1) 7.5g high density heat storage phase-changing material, phase change paraffin or antierythrite are placed in drying box and are heated to whole thawings,
Magnetic stirring apparatus is opened to higher than 5 DEG C of preheating 5min of fusion temperature simultaneously；
(2) the high density heat storage phase-changing material being completely melt is placed on magnetic stirring apparatus, stirring rate 120r/min, is waited
All watery fusions into liquid；
(3) stirring rate increases to 280r/min, is slowly added to 2g expanded graphite by several times；
(4) stop stirring 20s, exhaust continues to stir later, stirring rate 400-450r/min, at interval of 5min, stops
20s；
(5) step (4) are repeated, mixing time stops after amounting to 1h；
(6) by graphene oxide solution, the effective content of graphene oxide is 0.5g, is slowly dropped into, and stirs 2.5h, stirring speed
Rate is 450 r/min, is reacted with pH=9 of the triethanolamine aqueous solution adjustment reaction solution of 10wt% with terminating, with filter paper mistake
Filter, and it is multiple with 50 DEG C of distillation water washing, 48h is dried in vacuo at 35 DEG C.
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| CN111894520A (en) * | 2019-05-06 | 2020-11-06 | 中石化石油工程技术服务有限公司 | Method for regulating temperature of drilling fluid based on paraffin material |
| CN114391083A (en) * | 2019-06-27 | 2022-04-22 | 埃沃尔技术股份有限公司 | Operational scenario for collecting heat producing formations |
| CN114391083B (en) * | 2019-06-27 | 2024-04-02 | 埃沃尔技术股份有限公司 | Operating scheme for collecting heat producing formations |
| WO2021212201A1 (en) * | 2020-04-21 | 2021-10-28 | Eavor Technologies Inc. | Method for forming high efficiency geothermal wellbores using phase change materials |
| CN111545142A (en) * | 2020-05-21 | 2020-08-18 | 中国石油大学(华东) | High-temperature phase-change constant-temperature microcapsule, active temperature-control high-temperature drilling fluid system, and preparation and application thereof |
| CN112358852A (en) * | 2020-11-12 | 2021-02-12 | 中国石油大学(华东) | Phase-change microcapsule, preparation method thereof, intelligent temperature-control water-based drilling fluid and application |
| CN112781422A (en) * | 2021-02-02 | 2021-05-11 | 西南石油大学 | Method for realizing combination of shaft cooling and heat energy utilization by using drilling fluid |
| CN116063996A (en) * | 2023-04-03 | 2023-05-05 | 西南石油大学 | Phase-change heat storage microcapsule material suitable for cooling drilling fluid and preparation method thereof |
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