CN107540260A - A kind of well cementation low heat cement early strength agent and the cement for including it - Google Patents
A kind of well cementation low heat cement early strength agent and the cement for including it Download PDFInfo
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- CN107540260A CN107540260A CN201710738454.2A CN201710738454A CN107540260A CN 107540260 A CN107540260 A CN 107540260A CN 201710738454 A CN201710738454 A CN 201710738454A CN 107540260 A CN107540260 A CN 107540260A
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- 239000004568 cement Substances 0.000 title claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010445 mica Substances 0.000 claims abstract description 11
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical class OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 10
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229940043237 diethanolamine Drugs 0.000 claims abstract description 9
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 9
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 9
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 9
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical class [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 9
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 8
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 8
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical group O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 8
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- PANBYUAFMMOFOV-UHFFFAOYSA-N sodium;sulfuric acid Chemical compound [Na].OS(O)(=O)=O PANBYUAFMMOFOV-UHFFFAOYSA-N 0.000 claims 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 16
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 8
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 8
- 230000015271 coagulation Effects 0.000 abstract description 5
- 238000005345 coagulation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000460 chlorine Substances 0.000 abstract description 3
- 229910052801 chlorine Inorganic materials 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 239000011083 cement mortar Substances 0.000 description 25
- 238000012360 testing method Methods 0.000 description 14
- 239000003129 oil well Substances 0.000 description 12
- 239000002253 acid Substances 0.000 description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 6
- 239000001110 calcium chloride Substances 0.000 description 6
- 229910001628 calcium chloride Inorganic materials 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008719 thickening Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007785 strong electrolyte Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- GTTYPHLDORACJW-UHFFFAOYSA-N nitric acid;sodium Chemical compound [Na].O[N+]([O-])=O GTTYPHLDORACJW-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of well cementation low heat cement early strength agent and the cement for including it, it is related to cement additive technical field field, it includes the component of following parts by weight：23 27 parts of sodium sulphate, 57 parts of sodium nitrate, 35 parts of ferrous sulfate, 0.2 0.3 parts of diethanol amine, 0.4 0.5 parts of triethanolamines, 1.0 1.3 parts of water reducers, 2 2.5 parts of ultrafine mica powders, 0.3 0.5 parts of lithium carbonates, 0.8 1.0 parts of talcum powder.Early-strength dose has superior low-temperature high-early strength and compression strength, disclosure satisfy that the needs of deepwater work low temperature well cementing, reduces the Hou Ning times, improves operating efficiency and security；Early-strength dose is that in use, good fluidity is no to dodge coagulation phenomena, to the corrosion-free effect of sleeve pipe without chlorine early strength agent.
Description
Technical field
The present invention relates to cement additive technical field field, low heat cement early strength agent and bag are used in more particularly to a kind of well cementation
Containing its cement.
Background technology
Oil-well cement is exclusively used in the casing and cementing of oil well, gas well, also known as plugging cement.It it is main it is primary be by sleeve pipe with
The cementing sealing in rock stratum of surrounding, oil, gas and water layer in stratum are insulated, prevents mutual crosstalk, to form one in well from oil reservoir
Flow to ground and completely cut off good oil flow channel.The basic demand of oil-well cement is：Cement mortar will have necessarily during well is noted
Mobility and suitable density；, should be compared with quick setting after cement mortar injects into well, and reach suitable intensity in a short time；Firmly
Cement mortar after change should have good stability and impervious, corrosion stability.
Ocean deepwater well cementing operation environment has the characteristics of temperature is low, shallow-layer stream and low bottom fracture pressure, well cementing process
Middle faced low temperature environment will have a strong impact on oil-well cement hydration rate, make Behavior of Hardened Cement Paste early strength relatively low, annular space Behavior of Hardened Cement Paste
Enough shear stresses can not be reached in the shorter time and carry out supporting sleeve weight.Cause Hou Ning time lengthenings of cementing the well, Wu Faman
Foot well cementation quick setting early strength requirement.It is to shorten cement mortar setting time in ground temperature Gu well, improve cement early strength to add early strength agent
Main method.Conventional early strength agent has inorganic strong electrolyte and a class of water-soluble organic bath two, and inorganic strong electrolyte class is main
There are chloride salt, Sulfates and Nitrates, calcium chloride is conventional chloride salt early strength agent, but calcium chloride easily surrenders cement mortar
Value rise, or even occur dodge coagulation phenomena, make cement mortar can not infusion, in addition, can also make Behavior of Hardened Cement Paste volume contraction increase, permeability
Rise and the decline of anti-sulphate corrosion ability etc.；Sulfates early strength agent easily causes to corrode to Behavior of Hardened Cement Paste, influences the resistance to of Behavior of Hardened Cement Paste
Long property；Triethanolamine is more commonly used organic early strength agent, makes cement mortar slow setting, and the mechanism of action on the contrary in excessive concentration
It is not yet unified.There are a variety of shortcomings in the early strength agent of one-component, can not meet needs of the early strength agent in reinforcing oil well, existing to grind
Study carefully the multidirectional complex accelerator development of trend.But its early epistasis of existing complex accelerator can be unsatisfactory, and exploitation new type low temperature is early
Exploration and exploitation of the strong agent for the Marine oil and gas resource under the harsh conditions such as low temperature, shallow-layer stream are significant.
The content of the invention
In view of this, present invention offer is a kind of has superior low-temperature high-early strength and compression strength, disclosure satisfy that deep water is made
The needs of industry low temperature well cementing, reduce the Hou Ning times, improve operating efficiency and security without chlorine well cementation low heat cement early strength agent
And include its cement.
In order to realize foregoing invention purpose, the present invention provides following technical scheme：
Low heat cement early strength agent is used in one kind well cementation, and it includes the component of following parts by weight：23-27 part sodium sulphate, 5-7 part nitric acid
Sodium, 3-5 part ferrous sulfate, 0.2-0.3 part diethanol amine, 0.4-0.5 part triethanolamines, 1.0-1.3 part water reducers, 2-2.5 parts
Ultrafine mica powder, 0.3-0.5 part lithium carbonates, 0.8-1.0 part talcum powder.
The present invention also has following additional technical feature：
Preferably, the water reducer is melamine water reducing agent and poly carboxylic acid series water reducer according to mass ratio 1:1 mixing.
Preferably, the ultrafine mica powder is nano mica powder.
The present invention also provides a kind of low temperature well cementing cement, includes above-mentioned early strength agent.
The present invention well cementation be with low heat cement early strength agent preparation method：Will be well mixed by weight under each material normal temperature
Produce.
In general, needing to add high-strength float bead in the cement mortar of deepwater work reduces density, and early-strength dose can be with
It is used together with high-strength float bead.
Compared to the prior art the present invention, the advantage is that：
1. the present invention uses ultrafine mica powder as nucleus, in addition to itself having excellent acid-alkali-corrosive-resisting performance, its surface
With more fractural structure, more growth position can be provided for C-S hydrated products, it is grown up rapidly, reach raising water
The effect of mud morning epistasis；Talcum powder can reduce the viscosity of cement mortar as dispersant, improve the mobility of cement mortar, make water
Mud smoothly pumps, and the compactness of the space increase Behavior of Hardened Cement Paste in being starched with filling concrete, improves compression strength and Behavior of Hardened Cement Paste
Durability, reduce the retraction volume of Behavior of Hardened Cement Paste；
2. early-strength dose has superior low-temperature high-early strength and compression strength, deepwater work low temperature well cementing disclosure satisfy that
Need, reduce the Hou Ning times, improve operating efficiency and security；
3. early-strength dose is that in use, good fluidity is no to dodge coagulation phenomena, to the corrosion-free work of sleeve pipe without chlorine early strength agent
With.
Embodiment
Following discloses some embodiments of the present invention, those skilled in the art can be suitably modified work according to present disclosure
Skill parameter is realized.In particular, all similar replacements and change are aobvious and easy for a person skilled in the art
See, they are considered as being included in the present invention.The method of the present invention and application are described by preferred embodiment,
Related personnel substantially can not depart from present invention, method described herein and application are modified in spirit and scope or
Suitably change with combining, to realize and using the technology of the present invention.
Material：The mesh of nano mica powder 6000, Lingshou County An Hong mineral products processings factory；
The high performance water reducing agent of polyocarboxy acid of Horizon 1401（Pulvis）, Shandong Hua Di building technologies Co., Ltd；
Melamine water reducing agent, Shandong Hua Di building technologies Co., Ltd；
G level oil-well cements, Shandong Huayin Special Cement Co., Ltd..
Embodiment 1
Each component is weighed according to following ratio：25 parts of sodium sulphate, 6 parts of sodium nitrate, 4 parts of ferrous sulfate, 0.2 part of diethanol amine,
0.5 part of triethanolamine, 1.2 parts of water reducers（Melamine water reducing agent：High performance water reducing agent of polyocarboxy acid 1:1）, 2.3 parts of ultra-fine micas
Powder, 0.4 part of lithium carbonate, 0.9 part of talcum powder.
Above component is placed in mixer to stir and produces cement early strength agent 1.
Embodiment 2
Each component is weighed according to following ratio：23 parts of sodium sulphate, 5 parts of sodium nitrate, 5 parts of ferrous sulfate, 0.2 part of diethanol amine,
0.5 part of triethanolamine, 1.0 parts of water reducers（Melamine water reducing agent：High performance water reducing agent of polyocarboxy acid 1:1）, 2.5 parts of ultra-fine micas
Powder, 0.3 part of lithium carbonate, 1.0 parts of talcum powder.
Above component is placed in mixer to stir and produces cement early strength agent 2.
Embodiment 3
Each component is weighed according to following ratio：27 parts of sodium sulphate, 5 parts of sodium nitrate, 3 parts of ferrous sulfate, 0.3 part of diethanol amine,
0.4 part of triethanolamine, 1.3 parts of water reducers（Melamine water reducing agent：High performance water reducing agent of polyocarboxy acid 1:1）, 2 parts of ultra-fine micas
Powder, 0.5 part of lithium carbonate, 0.8 part of talcum powder.
Above component is placed in mixer to stir and produces cement early strength agent 3.
Comparative example 1
Each component is weighed according to following ratio：25 parts of sodium sulphate, 6 parts of sodium nitrate, 4 parts of ferrous sulfate, 0.2 part of diethanol amine,
0.5 part of triethanolamine, 1.2 parts of water reducers（High performance water reducing agent of polyocarboxy acid）, 2.3 parts of ultrafine mica powders, 0.4 part of lithium carbonate, 0.9
Part talcum powder.
Above component is placed in mixer to stir and produces cement early strength agent to 1.
Comparative example 2
Each component is weighed according to following ratio：25 parts of sodium sulphate, 6 parts of sodium nitrate, 4 parts of ferrous sulfate, 0.2 part of diethanol amine,
0.5 part of triethanolamine, 1.2 parts of water reducers（Melamine water reducing agent：High performance water reducing agent of polyocarboxy acid 1:1）, 2.3 parts of ultra-fine micas
Powder, 0.4 part of lithium carbonate.
Above component is placed in mixer to stir and produces cement early strength agent to 2.
Comparative example 3
Each component is weighed according to following ratio：25 parts of sodium sulphate, 6 parts of sodium nitrate, 4 parts of ferrous sulfate, 0.2 part of diethanol amine,
0.5 part of triethanolamine, 1.2 parts of water reducers（Melamine water reducing agent：High performance water reducing agent of polyocarboxy acid 1:1）, 0.4 part of lithium carbonate,
0.9 part of talcum powder.
Above component is placed in mixer to stir and produces cement early strength agent to 3.
The intensity test of test case 1
According to GB/T 19139-2003《Oil-well cement experimental method》Prepare the ratio of mud be 0.44 cement mortar, weigh respectively for
Cement quality 0,1.5%, 2% early strength agent 1 add in cement mortar, 20cm3 test block are made, 12h is conserved in standard curing kettle
In age, tested using pressure experiment machine.Test result is shown in Table 1.
Table 1 shows influence of the early strength agent of different dosages to cement mortar compression strength, when early strength agent is cementaceous
When measuring 1.5%, compression strength performance is superior, and when it increases to 2%, compression strength reduces on the contrary, and this can be construed to three
Monoethanolamine caused retardation phenomenon when dosage is too high, adds cement slurry thickening time, is unfavorable for well cementing operation, therefore, will
The usage amount of early strength agent is set to for the 1.5% of cement quality.
According to GB/T 19139-2003《Oil-well cement experimental method》Prepare the ratio of mud be 0.44 cement mortar, weigh for
The early strength agent of cement quality 1.5% is added in cement mortar, and 20cm is made3Test block, in standard curing kettle set different temperatures after
Maintenance is tested to regulation age phase using pressure experiment machine.Early-strength dose of test result such as table 2, comparative example test
As a result such as table 3.
Table 2, table 3 are visible, and early-strength dose can reach good compression strength within the cryogenic conditions short time, lead to
Cross comparative example and find that water reducer plays key effect, and talcum powder as dispersant and ultrafine mica powder adding as nucleator
Enter to greatly speed up the hydration time of cement mortar, shorten aquation induction period, improve the cryogenic property of cement mortar.
The thickening time of test case 2 tests
According to GB/T 19139-2003《Oil-well cement experimental method》The cement mortar that the ratio of mud is 0.44 is prepared, is weighed as cement
The early strength agent of quality 1.5% is added in cement mortar, determines the cement thickening time using multiviscosity meter, as shown in table 4.
Being found in test process, early-strength dose of cement mortar can substantially shorten the thickening time of cement mortar,
And do not thickened in experimentation, dodge the bad phenomenon such as solidifying, at 15 DEG C 10 MPa thickening times control within 5 hours, guarantor
The job safety demonstrate,proved in work progress reduces the Hou Ning times, improves operating efficiency.
The mortar architecture rheology testing of test case 3
According to GB/T 19139-2003《Oil-well cement experimental method》The cement mortar that the ratio of mud is 0.44 is prepared, is weighed as cement
The early strength agent of quality 1.5% is added in cement mortar, cement slurry density 1.87g/cm3.Using R/S-SST type rheometer measurement water
Rheological characteristic under 20 DEG C of condition of normal pressure of mud, and set without early strength agent group and calcium chloride early strength agent control group, the addition of calcium chloride
Amount is added according to the 2.5% of its most suitable cement quality, and test result is shown in Table 5.
Table 5 is visible, and early-strength dose of slurry flowing performance-changing compared with the cement mortar without early strength agent and uses calcium chloride
Slurry flowing performance-changing it is superior, can occur in the test that early strength agent is done using calcium chloride dodge coagulation phenomena, be less favorable for oil well
The pumping of cement.And early-strength dose of cement mortar can reduce viscosity within a certain period of time without coagulation phenomena is dodged, water is improved
The rheological characteristic of mud, suitable for improving low temperature oil-well cement mobile performance.Shown by contrasting, effect of the talcum powder to rheological characteristic
It is more obvious.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. low heat cement early strength agent is used in one kind well cementation, it is characterised in that it includes the component of following parts by weight：23-27 part sulfuric acid
Sodium, 5-7 part sodium nitrate, 3-5 part ferrous sulfate, 0.2-0.3 part diethanol amine, 0.4-0.5 part triethanolamines, 1.0-1.3 parts subtract
Aqua, 2-2.5 part ultrafine mica powders, 0.3-0.5 part lithium carbonates, 0.8-1.0 part talcum powder.
2. low heat cement early strength agent is used in well cementation according to claim 1, it is characterised in that the water reducer is melamine
Water reducer is with poly carboxylic acid series water reducer according to mass ratio 1:1 mixing.
3. low heat cement early strength agent is used in well cementation according to claim 1, it is characterised in that the ultrafine mica powder is nanometer
Level mica powder.
4. a kind of low temperature well cementing cement, it is characterised in that include the early strength agent described in claim any one of 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710738454.2A CN107540260B (en) | 2017-08-25 | 2017-08-25 | Low-temperature cement early strength agent for well cementation and cement containing low-temperature cement early strength agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710738454.2A CN107540260B (en) | 2017-08-25 | 2017-08-25 | Low-temperature cement early strength agent for well cementation and cement containing low-temperature cement early strength agent |
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| Publication Number | Publication Date |
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| CN107540260A true CN107540260A (en) | 2018-01-05 |
| CN107540260B CN107540260B (en) | 2020-05-05 |
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| CN201710738454.2A Active CN107540260B (en) | 2017-08-25 | 2017-08-25 | Low-temperature cement early strength agent for well cementation and cement containing low-temperature cement early strength agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109943303A (en) * | 2019-04-16 | 2019-06-28 | 中国石油集团长城钻探工程有限公司固井公司 | A kind of oil well cement chlorine-free coagulation accelerating early strength agent and its preparation method and application |
| CN110054440A (en) * | 2019-03-14 | 2019-07-26 | 中石油煤层气有限责任公司 | A kind of coal bed gas well cementation low-temperature high-early strength low weight cement slurry |
| CN112745094A (en) * | 2021-01-11 | 2021-05-04 | 河北承大环保科技有限公司 | Low-temperature-resistant modified cement and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054440A (en) * | 2019-03-14 | 2019-07-26 | 中石油煤层气有限责任公司 | A kind of coal bed gas well cementation low-temperature high-early strength low weight cement slurry |
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| CN112745094A (en) * | 2021-01-11 | 2021-05-04 | 河北承大环保科技有限公司 | Low-temperature-resistant modified cement and preparation method thereof |
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| Publication number | Publication date |
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| CN107540260B (en) | 2020-05-05 |
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