CN118184275A - Low-temperature cement slurry and preparation method and application thereof - Google Patents
Low-temperature cement slurry and preparation method and application thereof Download PDFInfo
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- CN118184275A CN118184275A CN202211605266.XA CN202211605266A CN118184275A CN 118184275 A CN118184275 A CN 118184275A CN 202211605266 A CN202211605266 A CN 202211605266A CN 118184275 A CN118184275 A CN 118184275A
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- 239000004568 cement Substances 0.000 title claims abstract description 187
- 239000002002 slurry Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 238000007613 slurry method Methods 0.000 title description 2
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims abstract description 26
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011149 active material Substances 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 7
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 5
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 5
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 5
- 235000019795 sodium metasilicate Nutrition 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 14
- 239000003129 oil well Substances 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 11
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 10
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 8
- 159000000000 sodium salts Chemical class 0.000 claims description 8
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 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 4
- 239000013530 defoamer Substances 0.000 claims description 4
- 239000010755 BS 2869 Class G Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 2
- 239000004137 magnesium phosphate Substances 0.000 claims description 2
- 229960002261 magnesium phosphate Drugs 0.000 claims description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 2
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 2
- 239000004005 microsphere Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000011411 calcium sulfoaluminate cement Substances 0.000 claims 1
- 230000000116 mitigating effect Effects 0.000 claims 1
- 239000004575 stone Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 13
- 238000011161 development Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 238000003756 stirring Methods 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 238000007710 freezing Methods 0.000 description 8
- 230000036571 hydration Effects 0.000 description 8
- 239000012779 reinforcing material Substances 0.000 description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 7
- 239000002585 base Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000001110 calcium chloride Substances 0.000 description 5
- 229910001628 calcium chloride Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000008719 thickening Effects 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000002528 anti-freeze Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000005457 ice water Substances 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides low-temperature cement slurry and a preparation method and application thereof. The cement paste comprises the following components in parts by weight: 100 parts of cement, 5-20 parts of cement base material, 5-15 parts of low-temperature active material, 1-6 parts of early strength agent, 0-15 parts of lightening agent, 0.5-2 parts of dispersing agent, 0.5-2.5 parts of fluid loss agent, 0.1-1 part of retarder, 0.1-1 part of defoaming agent and 40-80 parts of water; wherein the early strength agent comprises one or more than two of lithium chloride, sodium sulfate, sodium thiosulfate, sodium aluminate, triethanolamine and sodium metasilicate. The low-temperature cement slurry has the characteristics of early strength, micro expansion and adjustable cement comprehensive performance, and can meet the well cementation technical requirements of low-temperature stratum such as deep water, polar region and the like.
Description
Technical Field
The invention belongs to the technical field of oil-gas well cementing additives, and particularly relates to low-temperature cement slurry and a preparation method and application thereof.
Background
The deep sea and polar region has huge oil and gas resource development potential, and along with the development of oil and gas resource exploration and development of the deep sea and polar region, the low-temperature well cementation cement paste and key additives thereof become keys for guaranteeing the safe and effective operation of the low-temperature well cementation operation. The environment temperature of the deep sea and polar region is low, and particularly the surface layer temperature of the polar region can reach below minus 5 ℃, in the environment, the hydration progress and the strength development speed of a conventional cement slurry system in well cementation operation are extremely slow, even water in cement slurry is coagulated into ice, the cement slurry hydration reaction is not participated, the cement slurry is not coagulated and has no strength, and safety guarantee cannot be provided for subsequent drilling construction operation. Therefore, the low-temperature reinforcing material is generally added into the system, so that the cement paste setting time at low temperature is shortened, the cement paste strength is improved, and the cement paste has very important effects on ensuring the comprehensive performance of a low-temperature cement paste system, ensuring the operation safety and improving the well cementation quality.
At present, the middle-low temperature early strength agents are various, mainly take inorganic salt early strength agents as main materials, and can improve the early strength of well cementation cement stones and shorten the waiting time. However, the common early strength agents still have some problems: ① The most widely used calcium chloride early strength agent is easy to cause the rheological property of cement paste to be poor, the problem of difficult ash discharging and high consistency during injection and replacement occurs, and even the phenomenon of 'false setting' occurs; ② In the potassium salt early strength agent, K + is not involved in cement hydration, is easy to separate out on the surface of the cement stone, particularly the surface layer of the cement stone is crystallized at low temperature, and then swells and cracks, so that the surface of the cement stone is defective; ③ The common middle-low early strength agent has the action temperature of 10-30 ℃, has no obvious early strength effect on cement paste at low temperature and ultralow temperature, and even more, the water in the cement paste is condensed into ice, the cement paste has no strength development, and the risk of well cementation operation is increased.
Aiming at the technical problems, the prior art discloses a plurality of low-temperature early strength and toughness cement paste technologies, for example, CN106986584 discloses a low-temperature high strength and toughness cement paste system which comprises raw material components such as cement, low-temperature active materials, early strength agents, expansion toughness materials, dispersing agents, fluid loss agents and the like, wherein the low-temperature active materials are the combination of slag powder and superfine cement, the early strength agents are the combination of calcium chloride, sodium carbonate and calcium metasilicate, and the result shows that the cement paste system disclosed by the patent can effectively overcome the defects of slow strength development, low strength, strong brittleness and the like of conventional cement stones at low temperature. However, the low-temperature active material adopted by the technology is slag powder, and the slag powder is not considered, so that the early strength is improved, and the water demand of cement paste is increased, so that the fluidity is lost; meanwhile, calcium chloride, sodium carbonate and calcium metasilicate all cause thickening of cement paste, even the phenomenon of 'flash setting' occurs, and well cementation accidents are easy to occur.
In the prior art represented by the above patent, although the low-temperature cement slurry can have outstanding progress in low-temperature early strength, toughness expansion and the like, in a low-temperature (0-5 ℃) environment, particularly under the condition that the temperature is close to a freezing point (0 ℃), the anti-icing effect of cement slurry is not ideal with the early strength effect of cement stone under the extremely low-temperature condition, and the low-temperature cement slurry reinforcing material of the prior art has great general influence on the fluidity. Therefore, in order to ensure the cementing quality of the polar region or the deep sea low-temperature stratum, the development of the cement paste low-temperature reinforcing material with a lower applicable temperature range has very important significance.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the low-temperature cement slurry, the preparation method and the application thereof, and the cement slurry is beneficial to the early strength development of cement stones in a low-temperature environment (0-5 ℃), has the characteristics of early strength, micro expansion and adjustable cement comprehensive performance, and can meet the well cementation technical requirements of low-temperature stratum such as deep water, polar region and the like.
In order to achieve the above purpose, the invention provides a low-temperature cement slurry, which comprises the following components in parts by weight: 100 parts of cement, 5-20 parts of cement base material, 5-15 parts of low-temperature active material, 1-6 parts of early strength agent, 0-15 parts of lightening agent, 0.5-2 parts of dispersing agent, 0.5-2.5 parts of fluid loss agent, 0.1-1 part of retarder, 0.1-1 part of defoaming agent and 40-80 parts of water;
Wherein the early strength agent comprises one or more than two of lithium chloride, sodium sulfate, sodium thiosulfate, sodium aluminate, triethanolamine and sodium metasilicate. The early strength agent can shorten the strength starting time of cement paste and promote the strength development of cement stones.
According to a specific embodiment of the present invention, preferably, the retarder is added in an amount of 0.1 to 0.5 parts.
According to a specific embodiment of the present invention, preferably, the amount of the lightening agent added is 0.001 to 15 parts; more preferably, the lightening agent comprises glass microspheres; the purpose of adding the lightening agent (such as glass beads) is to adjust the density of the cement paste, slow down heat dissipation, prevent the internal temperature of the cement paste from decreasing too fast, the adding amount is 0-15 parts, if the low-density cement paste is needed, the lightening agent glass beads are needed to be added; if the conventional density cement paste is needed, the glass beads do not need to be added.
According to a specific embodiment of the present invention, preferably, the cement comprises a class G oil well cement.
According to a specific embodiment of the present invention, preferably, the cement-based material comprises a sulphoaluminate cement and/or a magnesium phosphate cement. The cement base material can accelerate hydration heat release and hydration rate of cement, shorten cement paste initial setting time, and increase compactness of cement stone, thereby achieving salt corrosion resistance, permeation resistance and prevention of pore water crystallization frost cracking of the cement stone.
According to a specific embodiment of the present invention, preferably, the sulphoaluminate cement is calcium sulphoaluminate cement.
According to a specific embodiment of the present invention, preferably, the low temperature active material comprises metakaolin. The hydration activity of the low-temperature active material is higher, the initial setting time of cement paste can be shortened under the cooperation activation of the low-temperature active material and the early strength of cement paste can be improved, and the cracking of the cement paste caused by the volume shrinkage of the cement paste under the low-temperature condition can be compensated; metakaolin is used as a low-temperature active material, and can generate a volcanic ash effect with metal ions in an early strength agent (alkali excitant) to generate a larger amount of hydration products and release heat; meanwhile, the metakaolin has finer granularity and can fill dense gaps, so that the cement-based material tends to be dense.
According to a particular embodiment of the invention, preferably, the metakaolin has a purity of greater than or equal to 95%, a density of greater than or equal to 2.50g/cm 3 and a mesh number of greater than or equal to 5000 mesh.
According to a specific embodiment of the present invention, preferably, the early strength agent is a combination of lithium chloride, sodium sulfate and sodium aluminate in a weight ratio of 2-4:1-2:0.2-1, preferably 3:1.5:0.5, more preferably, further comprising triethanolamine.
According to a specific embodiment of the present invention, preferably, the early strength agent is a combination of lithium chloride, sodium thiosulfate and sodium aluminate in a weight ratio of 2-4:1-2:0.2-1, preferably 3:1.5:0.5, more preferably, further comprising triethanolamine.
Li + has the characteristics of small radius, strong polarization effect and the like, and lithium chloride can play a role in drag reduction and dispersion by being used as an early strength agent, and the fluidity and rheological property of the slurry can be changed under proper addition.
The composite early strength agent is formed by adopting inorganic salt materials such as lithium chloride, sodium metasilicate and the like, and the composite early strength agent is matched with wet-mixed triethanolamine in water, so that the cement base material and the low-temperature active material can be effectively excited, the reaction is accelerated, the initial setting time of the cement slurry is shortened, and the early strength of the cement stone is improved.
The inorganic salt materials such as lithium chloride, calcium sulfate and the like are matched with triethanolamine, so that the crystallization point of the cement paste can be reduced to below-5 ℃, the anti-freezing effect is realized, and the problem of hydration stagnation caused by freezing of water in the cement paste is relieved.
According to a specific embodiment of the present invention, preferably, the triethanolamine is added in an amount of 0.03 to 0.06 parts.
According to a specific embodiment of the present invention, preferably, the glass beads have a density of 0.35-0.45g/cm 3 and a burst strength of greater than 80MPa.
According to a specific embodiment of the present invention, preferably, the dispersant comprises a sodium salt of polynaphthalenesulfonic acid.
According to a specific embodiment of the present invention, preferably, the fluid loss additive comprises polyvinyl alcohol and/or 2-acrylamido-2-methylpropanesulfonic acid based polymers.
According to a particular embodiment of the invention, preferably, the retarder comprises hydroxyethylidene diphosphonic acid.
According to a specific embodiment of the present invention, preferably, the defoamer comprises tributyl phosphate.
The invention also provides a preparation method of the low-temperature cement slurry, which comprises the following steps:
(1) Mixing cement, a cement base material, a low-temperature active material, an early strength agent, a dispersing agent, a fluid loss agent and a retarder according to a proportion to obtain a dry mixed material;
(2) Mixing a defoaming agent and water in proportion to obtain a wet mixed material;
(3) And mixing the dry mixed material with the wet mixed material to obtain the low-temperature cement slurry.
According to a specific embodiment of the present invention, preferably, in step (1), the mixed raw material further comprises a lightening agent.
According to a specific embodiment of the present invention, preferably, when the early strength agent comprises triethanolamine, the triethanolamine is mixed with the defoamer and water in step (2) to obtain a wet mix; the other components except triethanolamine in the early strength agent are added in the step (1).
The invention also provides application of the low-temperature cement slurry in well cementation of an oil and gas well.
According to a specific embodiment of the invention, preferably, in the above application, the temperature at which the oil and gas well is cemented is 0-5 ℃.
In summary, the invention obtains a low-temperature well cementation cement slurry system by mixing oil well cement with low-temperature reinforcing materials, lightening materials, dispersing agents, early strength agents, fluid loss additives and the like according to a proportion, effectively solves the problems of shrinkage, cracking and slow strength development of cement stones in a low-temperature environment of 0-5 ℃ (particularly 0 ℃), even water crystallization in cement slurry and cement slurry freezing at 0 ℃), has the adjustable characteristics of comprehensive properties of early strength, micro expansion, rust prevention and cement at low temperature, has good rheological property and no ash discharging problem, can be well applied to well cementation construction operations of deep water, polar regions and the like, shortens cement slurry thickening time, and can meet the requirement of well cementation quality of oil and gas wells in extremely cold environments; the preparation method of the low-temperature cement slurry is simple, has lower raw material cost and processing cost, and can be used for large-scale production and popularization.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a low-temperature cement slurry, which comprises the following specific components:
(1) The raw materials of the composition in parts by weight are shown in Table 1:
TABLE 1 composition of low-temperature cement slurry raw materials
(2) Preparation of low-temperature cement slurry:
Weighing materials according to the proportion, and uniformly mixing G-grade oil well cement, calcium sulfoaluminate, metakaolin, an early strength agent (except triethanolamine), a 2-acrylamide-2-methylpropanesulfonic acid polymer, polynaphthalenesulfonic acid sodium salt and hydroxyethylidene diphosphonic acid to obtain a dry mixture;
uniformly mixing triethanolamine, tributyl phosphate and water to obtain a wet mixed material;
And uniformly stirring and adding the dry mixture into the wet mixture within 15 seconds at the rotating speed of 4000+/-200 r/min, and continuously stirring for 35 seconds at the rotating speed of 12000+/-500 r/min after the dry mixture is completely wetted to obtain the low-temperature cement slurry with the density of 1.90g/cm 3.
Example 2
The embodiment provides a low-temperature cement slurry, which comprises the following specific components:
(1) The raw materials of the composition in parts by weight are shown in Table 2:
TABLE 2 composition of low-temperature cement slurry raw materials
(2) Preparation of low-temperature cement slurry:
Weighing materials according to the proportion, and uniformly mixing G-grade oil well cement, calcium sulfoaluminate, metakaolin, an early strength agent (except triethanolamine), a 2-acrylamide-2-methylpropanesulfonic acid polymer, glass beads, polynaphthalenesulfonic acid sodium salt and hydroxyethylidene diphosphonic acid to obtain a dry mixture;
uniformly mixing triethanolamine, tributyl phosphate and water to obtain a wet mixed material;
And uniformly stirring and adding the dry blend into the wet blend in 50s at the rotating speed of 4000+/-200 r/min, and obtaining the low-temperature cement slurry after the dry blend is completely wetted, wherein the density of the cement slurry is 1.80g/cm 3.
Example 3
The embodiment provides a low-temperature cement slurry, which comprises the following specific components:
(1) The raw materials of the composition in parts by weight are shown in Table 3:
TABLE 3 composition of low-temperature cement slurry raw materials
(2) Preparation of low-temperature cement slurry:
Weighing materials according to the proportion, and uniformly mixing G-grade oil well cement, calcium sulfoaluminate, metakaolin, an early strength agent (except triethanolamine), a 2-acrylamide-2-methylpropanesulfonic acid polymer, glass beads, polynaphthalenesulfonic acid sodium salt and hydroxyethylidene diphosphonic acid to obtain a dry mixture;
uniformly mixing triethanolamine, tributyl phosphate and water to obtain a wet mixed material;
And uniformly stirring and adding the dry blend into the wet blend in 50s at the rotating speed of 4000+/-200 r/min, and obtaining the low-temperature cement slurry after the dry blend is completely wetted, wherein the density of the cement slurry is 1.70g/cm 3.
Comparative example 1
The comparative example provides a low-temperature cement slurry, which comprises the following specific components:
(1) The raw materials of the composition in parts by weight are shown in Table 4:
TABLE 4 composition of low-temperature cement slurry raw materials
| G-grade oil well cement | 100 Parts of |
| Calcium sulfoaluminate | 0 Part of |
| Metakaolin clay | 0 Part of |
| Early strength agent | 0 Part of |
| Glass bead | 0 Part of |
| Polynaphthalenesulfonic acid sodium salt | 1.5 Parts by weight |
| Hydroxy ethylidene diphosphonic acid | 2.5 Parts of |
| Tributyl phosphate | 0.2 Part |
| Water and its preparation method | 44 Parts of |
(2) Preparation of low-temperature cement slurry:
weighing materials according to the proportion, and uniformly mixing G-grade oil well cement, polynaphthalenesulfonic acid sodium salt and hydroxyethylidene diphosphonic acid to obtain a dry mixed material;
Tributyl phosphate and water are uniformly mixed to obtain a wet mixed material;
And uniformly stirring and adding the dry mixture into the wet mixture within 15 seconds at the rotating speed of 4000+/-200 r/min, and continuously stirring for 35 seconds at the rotating speed of 12000+/-500 r/min after the dry mixture is completely wetted to obtain the low-temperature cement slurry with the density of 1.90g/cm 3.
Comparative example 2
The comparative example provides a low-temperature cement slurry, which comprises the following specific components:
(1) The raw materials of the composition in parts by weight are shown in Table 5:
TABLE 5 composition of low-temperature cement slurry raw materials
(2) Preparation of low-temperature cement slurry:
weighing materials according to the proportion, and uniformly mixing G-grade oil well cement, calcium chloride, polynaphthalenesulfonic acid sodium salt and hydroxyethylidene diphosphonic acid to obtain a dry mixed material;
Tributyl phosphate and water are uniformly mixed to obtain a wet mixed material;
And uniformly stirring and adding the dry mixture into the wet mixture within 15 seconds at the rotating speed of 4000+/-200 r/min, and continuously stirring for 35 seconds at the rotating speed of 12000+/-500 r/min after the dry mixture is completely wetted to obtain the low-temperature cement slurry with the density of 1.90g/cm 3.
Test example 1
The comprehensive properties of the low-temperature well cementation cement slurry systems in examples and comparative examples were evaluated according to the relevant regulations in national standard GB/T19139-2012, oil well cement test method, and the results are shown in tables 6 and 7.
TABLE 6 test results
As shown in Table 6, the low-temperature cement slurry has good pumpability and rheological property at the test temperature of 0-10 ℃, the API filtrate loss is less than 60mL, the slurry stability is excellent, free liquid is avoided, the cement slurry density adaptation range is 1.70-1.90g/cm 3, and the performance requirement of the cement slurry on the well cementation construction safety is met.
Table 7 test results
The key performance parameters of example 1, comparative example 1 and comparative example 2 in Table 7 are compared at the same density, and the compressive strength of the low-temperature cement slurry (example 1) provided by the invention is obviously higher than that of the base cement slurry (comparative example 1) for 24 hours at 10 ℃; on the premise of approaching the compressive strength, the pumpability and the fluidity of the low-temperature cement slurry provided by the invention are obviously better than those of cement slurry added with conventional reinforcing materials (comparative example 2). At 5 ℃, the compressive strength of the low-temperature cement slurry (example 1) provided by the invention for 48 hours is obviously higher than that of the base cement slurry (comparative example 1); on the premise of approaching the compressive strength, the pumpability and the fluidity of the low-temperature cement slurry provided by the invention are obviously better than those of cement slurry added with conventional reinforcing materials (comparative example 2). At 0 ℃, the water in the basic cement paste (comparative example 1) is reduced to the crystallization point due to the temperature, the cement stone is in a frozen state, the hydration process is stopped, the strength development is slow, and the cement stone has almost no compressive strength; the cement stone (comparative example 2) added with the conventional reinforcing material has the conditions of dent and shrinkage, the compressive strength is lower than that of the cement stone (example 1) provided by the invention, the cement stone is flash-coagulated, cement paste is barely stirred out at 7000r, the cement paste becomes thin along with slow stirring, and the cement paste can be stirred out at 1600 r.
Test example 2
The test example examines the anti-freezing effect and the impact on the resistance to pressure of common anti-freezing materials.
Cooling by using a refrigerated cabinet, and measuring the temperature of the ice-water mixture when the BOSCH temperature measuring gun begins to freeze; the following cement paste formulation procedure was used for the test: taking 100 parts of G-grade oil well cement as a dry mixed material; uniformly mixing an antifreezing agent and water according to different proportions to obtain a wet mixed material (the addition percentage of the antifreezing agent is the volume percentage of the antifreezing agent in the water); uniformly stirring and adding the dry blend into 44 parts of wet blend in 50s at the rotating speed of 4000+/-200 r/min, and obtaining the cement paste for the test example 2 after the dry blend is completely wetted, wherein the addition amount of each component is calculated by taking the mass of the obtained cement paste as 100%; the results are shown in tables 8 to 10.
TABLE 8
TABLE 9
Table 10
| Solution | -5℃ | -10℃ |
| 4% Calcium chloride solution | Ice water mixture (Bingduo) | Icing |
| 4% Lithium chloride solution | Ice water mixture | Icing |
| 10% Sodium chloride | Water and its preparation method | Icing |
| 10% Lithium chloride | Water and its preparation method | Water (partial ice) |
As can be seen from tables 8 to 10, the liquid sodium silicate has no antifreeze effect in the amount of 20 to 40%; 40% glycol can play a role in preventing freezing at-18 ℃;45% -50% of commercial glass water (wood alcohol) can play an antifreezing role at the temperature of minus 18 ℃.
The effect of the antifreeze on the compressive strength of cement was further examined and the results are shown in Table 11.
TABLE 11
| Type of antifreeze | Strength 2d/MPa (0-3 ℃ C.) | Density, g/cm 3 |
| Blank control group (Water only) | 6.9+6.7 | 1.892 |
| 25% Ethylene glycol | 3.1+4.1 | 1.94 |
| 30% Ethylene glycol | 1.8+2.2 | 1.92 |
| 30% Of commercial xylitol | Strength is not raised | 1.90 |
| 4% Calcium chloride solution | 11.1+14.2 | 1.90 (Lower ash flash set) |
| 4% Lithium chloride solution | 11.3+13.5 | 1.90 |
As can be seen from Table 11, the conventional antifreeze described above has a negative effect on the development of compressive strength, and calcium chloride causes problems of ash flash.
Test example 3
The thickening time of the low-temperature well cementation cement paste system of the example was evaluated according to the relevant regulations in national standard GB/T19139-2012 oil well cement test method, and the results are shown in Table 12.
Table 12
As can be seen from Table 12, the thickening time of the low-temperature cement slurry system provided by the invention is adjustable within 100-300min at the temperature of 0-10 ℃.
In conclusion, the low-temperature reinforcing material of the well cementation cement paste and the prepared cement paste system have excellent comprehensive performance, the thickening time of the formed cement paste system is adjustable for 100-300min, the cement paste at 0 ℃ is not frozen and swelled, the compressive strength of the cement paste at 0 ℃ is more than 10MPa/48h, the cement paste is suitable for well cementation construction under the low-temperature environment, the problems of shrinkage, cracking, slow strength development, water crystallization in the cement paste at 0 ℃ and freezing are effectively solved, the cement paste setting time is shortened, the early strength of the cement paste is improved, and the cement paste has good application prospect in deep water, polar region and other extremely cold stratum well cementation construction operations.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (23)
1. The low-temperature cement slurry comprises the following components in parts by weight: 100 parts of cement, 5-20 parts of cement base material, 5-15 parts of low-temperature active material, 1-6 parts of early strength agent, 0-15 parts of lightening agent, 0.5-2 parts of dispersing agent, 0.5-2.5 parts of fluid loss agent, 0.1-1 part of retarder, 0.1-1 part of defoaming agent and 40-80 parts of water;
Wherein the early strength agent comprises one or more than two of lithium chloride, sodium sulfate, sodium thiosulfate, sodium aluminate, triethanolamine and sodium metasilicate.
2. The low-temperature cement slurry according to claim 1, wherein the retarder is added in an amount of 0.1 to 0.5 parts.
3. The low-temperature cement slurry according to claim 1, wherein the amount of the lightening agent added is 0.001 to 15 parts.
4. The low cement slurry of claim 1, wherein the cement comprises a class G oil well cement.
5. The low-temperature cement slurry according to claim 1, wherein the cement-based material comprises a sulphoaluminate cement and/or a magnesium phosphate cement.
6. The low-temperature cement slurry according to claim 5, wherein the sulfoaluminate cement is calcium sulfoaluminate cement.
7. The low temperature cement slurry of claim 1, wherein the low temperature active material comprises metakaolin.
8. The low-temperature cement slurry according to claim 7, wherein the metakaolin has a purity of not less than 95%, a density of not less than 2.50g/cm 3 and a mesh number of not less than 5000.
9. The low-temperature cement slurry according to claim 1, wherein the early strength agent is lithium chloride, sodium sulfate and sodium aluminate in a weight ratio of 2-4:1-2:0.2-1, preferably in a weight ratio of 3:1.5:0.5.
10. The low-temperature cement slurry according to claim 1, wherein the early strength agent is lithium chloride, sodium thiosulfate and sodium aluminate in a weight ratio of 2-4:1-2:0.2-1, preferably in a weight ratio of 3:1.5:0.5.
11. The low-temperature cement slurry according to claim 9 or 10, wherein the early strength agent further comprises triethanolamine.
12. The low-temperature cement slurry according to claim 11, wherein the amount of triethanolamine added is 0.03 to 0.06 parts.
13. The low-temperature cement slurry of claim 1, wherein the mitigation agent comprises glass microspheres.
14. The low-temperature cement slurry according to claim 13, wherein the glass beads have a density of 0.35-0.45g/cm 3 and a burst strength of greater than 80MPa.
15. The low-temperature cement slurry according to claim 1, wherein the dispersant comprises polynaphthalenesulfonic acid sodium salt.
16. The low-temperature cement slurry according to claim 1, wherein the fluid loss agent comprises polyvinyl alcohol and/or 2-acrylamide-2-methylpropanesulfonic acid polymer.
17. The low cement slurry of claim 1, wherein the retarder comprises hydroxyethylidene diphosphonic acid.
18. The low-temperature cement slurry of claim 1, wherein the defoamer comprises tributyl phosphate.
19. A method for preparing the low-temperature cement slurry according to any one of claims 1 to 18, comprising the steps of:
(1) Mixing cement, a cement base material, a low-temperature active material, an early strength agent, a dispersing agent, a fluid loss agent and a retarder according to a proportion to obtain a dry mixed material;
(2) Mixing a defoaming agent and water in proportion to obtain a wet mixed material;
(3) And mixing the dry mixed material with the wet mixed material to obtain the low-temperature cement slurry.
20. The method according to claim 19, wherein in the step (1), the mixed raw material further comprises a lightening agent.
21. The process of claim 19, wherein the triethanolamine is mixed with the defoamer and water in step (2) to provide a wet mix.
22. Use of the low-temperature cement slurry of any one of claims 1-18 in oil and gas well cementing.
23. The use of claim 22, wherein the temperature at which the oil and gas well is cemented is 0-5 ℃.
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