CN114276118A - High-temperature-resistant anti-erosion oil well cement - Google Patents
High-temperature-resistant anti-erosion oil well cement Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 132
- 239000003129 oil well Substances 0.000 title claims abstract description 45
- 238000011065 in-situ storage Methods 0.000 claims abstract description 32
- 238000005260 corrosion Methods 0.000 claims abstract description 22
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 20
- 239000010440 gypsum Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 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 abstract description 15
- 239000004137 magnesium phosphate Substances 0.000 claims abstract description 15
- 229960002261 magnesium phosphate Drugs 0.000 claims abstract description 15
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims abstract description 15
- 235000010994 magnesium phosphates Nutrition 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- 239000006004 Quartz sand Substances 0.000 claims abstract description 9
- 239000000654 additive Substances 0.000 claims abstract description 9
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 7
- 235000012241 calcium silicate Nutrition 0.000 claims abstract description 7
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 claims abstract description 7
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000019976 tricalcium silicate Nutrition 0.000 claims abstract description 7
- 229910021534 tricalcium silicate Inorganic materials 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 8
- 230000003628 erosive effect Effects 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 20
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract description 2
- 230000008719 thickening Effects 0.000 description 10
- 239000012071 phase Substances 0.000 description 8
- 229910021538 borax Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 239000004328 sodium tetraborate Substances 0.000 description 6
- 235000010339 sodium tetraborate Nutrition 0.000 description 6
- 230000036571 hydration Effects 0.000 description 5
- -1 phosphorus-aluminum-magnesium Chemical compound 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
Abstract
A high-temperature-resistant anti-erosion oil well cement. Belongs to the technical field of concrete materials, and particularly relates to an improvement on a high-temperature-resistant and anti-corrosion system technology for oil well cement. The paint comprises the following components in parts by mass: 50-60 parts of in-situ toughness oil well cement, 10-20 parts of magnesium phosphate cement and 30-35 parts of quartz sand; the in-situ toughness oil well cement comprises the following mineral components in percentage by mass: 55-60% of tricalcium silicate, 15-18% of dicalcium silicate, 1-2% of tricalcium aluminate and 17-20% of tetracalcium aluminoferrite. Also comprises 1-2 parts by mass of fluid loss agent. Also comprises 0.1 to 0.5 mass portion of dispersant. Also comprises 0.3-0.5 mass part of retarder. Also comprises 3-5 parts by mass of gypsum powder. The gypsum powder is ground until the specific surface area is 320-450 m/kg. The invention firstly controls the content of iron in the cement clinker sintering process to form in-situ toughness cement, and then is supplemented with magnesium phosphate cement and other additives to form a high-temperature-resistant and anti-corrosion system for oil well cement, thereby forming the high-temperature-resistant and anti-corrosion system.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to an improvement on a high-temperature-resistant and anti-corrosion system technology for oil well cement.
Background
The oil industry is the driving force for economic development and oil exploration and drilling has become a major hot spot worldwide. Cementing operations connect three important production aspects of oil exploration-drilling, completion and development. The quality of cementing not only determines the rate and cost of drilling, but also directly affects the oil production and the life of the well. With the increase of oil and gas exploitability, exhaustion of exploitable reserves and progress of drilling technology, the development of high-temperature wells, deep wells and ultra-deep wells is increased. The temperature and pressure difference between the upper and lower parts of the cementing well section is increased, so that the oil well cement slurry is quickly thickened in the well cementing process, the requirements of well cementing construction cannot be met, safety accidents are caused in severe cases, and huge property loss of an oil field is caused. Meanwhile, the physical and chemical properties of the traditional silicate cement slurry under high temperature and high pressure can be obviously changed, the conditions of no high temperature resistance, insufficient strength, no corrosion resistance and the like occur, the service life is greatly reduced, and the well cementation quality is influenced.
Most of the existing anti-erosion concrete systems are prepared by introducing a large amount of external admixtures such as fly ash, mineral powder, silica fume, metakaolin and the like on the basis of ordinary portland cement, but the strength of the concrete is reduced along with the increase of the external admixtures, so the upper limit and the lower limit of the admixture are required to be controlled. Meanwhile, when the active ingredients of the admixture are relatively low, the phenomenon that the sulfate corrosion resistance is not increased but is reduced may occur, and the production cost of the cement is greatly increased by the incorporation of the admixture. Most of the existing anti-erosion concrete systems are resistant to erosion of chloride ions and sulfate ions of ocean engineering concrete, so when the system is applied to oil well cement cementing construction, the cement paste stability is poor, the later-stage shrinkage rate is high, the high temperature resistance is not realized, and the influence factors are complex.
Combined with the temperature of 150 ℃ in the application environment of oil well cement, the oil well cement slurry is subjected to corrosive medium (SO 4) in a shaft for a long time2-And HCO3-) Can lead to the reduction of the cement strength and influence the cementing quality. Therefore, SO4 was analyzed2-And HCO3-The corrosion rule and mechanism of the oil well cement paste are corroded, and the design of the corrosion-resistant oil well cement paste system has important significance for adjusting the production life of the well.
Disclosure of Invention
Aiming at the defects of large admixture doping amount, high cost and the like of the anti-corrosion system technology in the prior art, the invention provides the high-temperature-resistant anti-corrosion oil well cement, which can adapt to the temperature environment in the use of an oil well and has the characteristics of stable strength in the high-temperature environment and adjustable thickening time.
The technical scheme of the invention is as follows: the paint comprises the following components in parts by mass: 50-60 parts of in-situ toughness oil well cement, 10-20 parts of magnesium phosphate cement and 30-35 parts of quartz sand;
the in-situ toughness oil well cement comprises the following mineral components in percentage by mass: 55-60% of tricalcium silicate, 15-18% of dicalcium silicate, 1-2% of tricalcium aluminate and 17-20% of tetracalcium aluminoferrite.
Also comprises 1-2 parts by mass of fluid loss agent.
Also comprises 0.1 to 0.5 mass portion of dispersant.
Also comprises 0.3-0.5 mass part of retarder.
Also comprises 3-5 parts by mass of gypsum powder.
The gypsum powder is ground until the specific surface area is 320-450 m/kg.
The chemical components of the in-situ toughness oil well cement synthesized by tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite comprise:
SiO2：20.70-21.10%，
Al2O3：4.10-4.20%，
Fe2O3：5.50-6.00%，
CaO：62.50-62.80%，
MgO：1.25-1.30%，
SO3：2.35-2.45%，
and a trace amount of K2O、Na2O and TiO2 。
The in-situ toughness oil well cement has a 7d strength of 49MPa at 90-150 ℃.
The invention adopts a mode of combining the in-situ toughness cement and the magnesium phosphate cement, mainly combines the advantages of the two cements, the magnesium phosphate cement has good erosion resistance, but belongs to quick-setting and quick-hardening cement, the hydration and heat release are quick, the later strength has a phenomenon of retrogradation, the erosion resistance of the in-situ toughness cement is weaker than that of the magnesium phosphate cement, the thickening time is adjustable, and the later strength is stable, so the invention is carried out by adopting a compound mode of taking the in-situ toughness cement as a main material and the magnesium phosphate cement as an auxiliary material.
Compared with the prior art, the invention has the beneficial effects that:
1. the cement of the invention takes the in-situ toughness cement as the main material, and the alkali content of the in-situ toughness cement is controlled to be low, so the chemical erosion resistance effect is obvious. Research shows that the iron phase in the cement has better erosion resistance, the content of the iron phase in the in-situ toughness cement reaches 17-20%, the activity of the iron phase directly influences the hydration activity of the cement, and the iron phase strengthens C3Hydration of S, increase of C-S-H gel, and increase of set cementCompactness, hydrophobic property and waterproof property of the set cement are improved, and anti-erosion capability of the set cement is improved.
2. The cement of the invention takes magnesium phosphate cement as an auxiliary material, and hydration products of the magnesium phosphate cement do not contain Ca (OH)2Thereby reducing SO in the corrosive medium4 2–And Mg2+The reaction produces gypsum with larger expansibility, ettringite and Mg (OH) with loose and non-cementing capacity2And thus is not easily corroded, and exhibits good resistance to sulfate corrosion.
3. Through the reasonable formula of the invention, the characteristic of cement paste strength reduction caused by the addition of the retarder is effectively improved, the thickening time is adjustable while the thickening time is satisfied, and the cement paste strength is hardly influenced.
4. The additive used in the invention has lower cost and easy purchase, and improves the market competitiveness of the product.
5. The cement of the invention can be directly mixed with water in proportion, the operation is simple, and the field mixing process is reduced.
The invention firstly controls the content of iron in the cement clinker sintering process to form in-situ toughness cement, and then is supplemented with magnesium phosphate cement and other additives to form a high-temperature-resistant and anti-corrosion system for oil well cement, thereby forming the high-temperature-resistant and anti-corrosion system.
Detailed Description
The invention relates to high-temperature-resistant anti-erosion oil well cement which comprises the following components in parts by mass: 50-60 parts of in-situ toughness oil well cement, 10-20 parts of magnesium phosphate cement and 30-35 parts of quartz sand;
the in-situ toughness oil well cement comprises the following mineral components in percentage by mass: tricalcium silicate (C)3S) 55-60%, dicalcium silicate (C)2S) 15-18%, tricalcium aluminate (C)3A) 1-2% and tetracalcium aluminoferrite (C)4AF）17-20%。
The invention makes the tetracalcium aluminoferrite (C)4AF) content is limited to the range of 17-20%, and the inventors of the present invention found out based on experimental data that C is associated with4The AF content is increased, and the cement strength tends to increase firstly and then decreaseWhen C is present4When the AF content is limited to the range of 17-20%, the cement strength is optimal in the range, and a convex peak is presented.
In addition, alkali components (i.e., potassium oxide and sodium oxide) in cement are harmful components in cement, can cause cement setting time instability, and can also cause exterior efflorescence of set cement. The in-situ toughness oil well cement effectively controls the alkali content therein, thereby forming a certain anti-erosion function.
When the content of the tetracalcium aluminoferrite mineral is more than or equal to 17% and less than or equal to 20%, the strength of the cement in 7 days in a high-temperature environment (90-150 ℃) can reach 49 MPa.
The setting time of the magnesium phosphate cement has wide adjustability, and the 1d strength of the magnesium phosphate cement at normal temperature (10-30 ℃) can reach 40-60 MPa.
Also comprises 1-2 parts by mass of fluid loss agent. The fluid loss agent is prepared by polymerizing and modifying AMPS, low molecular amide, polyhydroxycarboxylic acid and the like. Reduce the filtration loss of liquid phase in the cement slurry to permeable stratum and control the water cement ratio.
Also comprises 0.1 to 0.5 mass portion of dispersant. The dispersing agent is compounded by a binary linear polycarboxylic acid copolymer, an early strength agent and a nucleating agent. Reducing the plastic viscosity and yield value of the cement paste and adjusting the fluidity of the cement paste.
Also comprises 0.3-0.5 mass part of retarder. The retarder is prepared by compounding a Metal Chelate Retarder (MCR) and borax according to any proportion. The thickening time is adjustable, the cement paste has almost no influence on the strength of the set cement, and meanwhile, the cement paste is high-temperature resistant and has good compatibility with other additives. The requirement of adjustable thickening time while meeting the thickening time is met.
Also comprises 3-5 parts by mass of gypsum powder. Adjusting the setting time of the cement.
The gypsum powder is ground until the specific surface area is 320-450 m/kg. The gypsum is also ground into powder to ensure the uniformity of mixing.
The chemical components of the in-situ toughness oil well cement synthesized by tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite comprise:
SiO2：20.70-21.10%，
Al2O3：4.10-4.20%，
Fe2O3：5.50-6.00%，
CaO：62.50-62.80%，
MgO：1.25-1.30%，
SO3：2.35-2.45%，
and a trace amount of K2O、Na2O and TiO2 。
The in-situ toughness cement of the invention has the mineral components shown in the table 1,
TABLE 1
The main chemical components are shown in the table 2,
TABLE 2
The chemical composition of the in-situ toughness cement obtained according to the mineral composition of the present invention is shown in the table above. Because the alkali content of the in-situ toughness cement is controlled to be low, the chemical corrosion resistance effect is obvious. Research shows that the iron phase in the cement has better erosion resistance, the content of the iron phase in the in-situ toughness cement reaches 17-20%, the activity of the iron phase directly influences the hydration activity of the cement, and the iron phase strengthens C3The hydration of S and the increase of C-S-H gel increase the compactness of the set cement, improve the hydrophobicity and the waterproofness of the set cement and improve the anti-erosion capability of the set cement.
The invention is further illustrated by the following examples:
example 1
A high-temperature-resistant anti-erosion oil well cement. According to the mass portion: 50 parts of in-situ toughness cement, 10 parts of phosphorus-aluminum-magnesium cement, 30 parts of quartz sand, 1 part of fluid loss additive, 0.1 part of dispersant and 0.3 part of retarder, wherein the retarder is prepared by mixing the following components in parts by weight: borax is 1: 1 and 3 parts of gypsum powder, wherein the specific surface area of the gypsum powder is 320m/kg, and the raw materials are uniformly mixed and then prepared according to the water-cement ratio of 0.44. The physical properties of the cement of this example are shown in Table 1.
Example 2
A high-temperature-resistant anti-erosion oil well cement. According to the mass portion: 55 parts of in-situ toughness cement, 15 parts of phosphorus-aluminum-magnesium cement, 33 parts of quartz sand, 1.5 parts of fluid loss additive, 0.3 part of dispersant and 0.4 part of retarder, wherein the retarder is prepared by mixing the following components in parts by weight: borax is 1: 1.5 and 3 parts of gypsum powder, wherein the specific surface area of the gypsum powder is 350m/kg, and the raw materials are uniformly mixed and then prepared according to the water-cement ratio of 0.44. The physical properties of the cement of this example are shown in Table 1.
Example 3
A high-temperature-resistant anti-erosion oil well cement. According to the mass portion: 50 parts of in-situ toughness cement, 20 parts of phosphorus-aluminum-magnesium cement, 35 parts of quartz sand, 2 parts of fluid loss additive, 0.4 part of dispersing agent and 0.3 part of retarder, wherein the retarder is prepared by mixing the following components in parts by weight: borax is 1: 2 and 4 parts of gypsum powder, wherein the specific surface area of the gypsum powder is 380m/kg, and the raw materials are uniformly mixed and then prepared according to the water-cement ratio of 0.44. The physical properties of the cement of this example are shown in Table 1.
Example 4
A high-temperature-resistant anti-erosion oil well cement. According to the mass portion: 55 parts of in-situ toughness cement, 20 parts of phosphorus-aluminum-magnesium cement, 30 parts of quartz sand, 1.5 parts of fluid loss additive, 0.3 part of dispersant and 0.4 part of retarder, wherein the retarder is prepared by mixing the following components in parts by weight: borax of 1.5: 1 and 4 parts of gypsum powder, wherein the specific surface area of the gypsum powder is 400m/kg, and the raw materials are uniformly mixed and then prepared according to the water-cement ratio of 0.44. The physical properties of the cement of this example are shown in Table 1.
Example 5
A high-temperature-resistant anti-erosion oil well cement. According to the mass portion: 60 parts of in-situ toughness cement, 20 parts of phosphorus-aluminum-magnesium cement, 35 parts of quartz sand, 2 parts of fluid loss agent, 0.5 part of dispersing agent and 0.5 part of retarder, wherein the retarder is prepared by mixing the following components in parts by weight: borax is 2: 1 and 5 parts of gypsum powder, wherein the specific surface area of the gypsum powder is 450m/kg, and the raw materials are uniformly mixed and then prepared according to the water-cement ratio of 0.44. The physical properties of the cement of this example are shown in Table 3.
TABLE 3 example physicochemical Properties of each index
As can be seen from Table 3, the fluidity of the cement paste of the high temperature and corrosion resistant oil well cement of the invention has no obvious change, the thickening time of the cement paste can reach about 200min at 150 ℃, the defects of non-adjustable thickening time and over-quick setting time of magnesium phosphate cement are greatly improved, meanwhile, the compression strength of the set cement can reach about 60MPa at 150 ℃ after 1d, the defect of low early strength of in-situ toughness cement is adjusted, and the cement paste system can delay the setting time to ensure the smooth construction and can generate strength in time to ensure the safety of well cementation construction. Compared with the oil well cement in the prior art, the thickening time and the compressive strength at high temperature are greatly improved.
Claims (8)
1. The high-temperature-resistant anti-corrosion oil well cement is characterized by comprising the following components in parts by mass: 50-60 parts of in-situ toughness oil well cement, 10-20 parts of magnesium phosphate cement and 30-35 parts of quartz sand;
the in-situ toughness oil well cement comprises the following mineral components in percentage by mass: 55-60% of tricalcium silicate, 15-18% of dicalcium silicate, 1-2% of tricalcium aluminate and 17-20% of tetracalcium aluminoferrite.
2. The high temperature and corrosion resistant oil well cement as claimed in claim 1, further comprising 1-2 parts by mass of fluid loss additive.
3. The high temperature and corrosion resistant oil well cement of claim 1, further comprising 0.1 to 0.5 parts by mass of a dispersant.
4. The high temperature and corrosion resistant oil well cement as claimed in claim 1, further comprising 0.3 to 0.5 parts by mass of a retarder.
5. The high temperature and corrosion resistant oil well cement as claimed in claim 1, further comprising 3-5 parts by mass of gypsum powder.
6. The high temperature and corrosion resistant oil well cement as claimed in claim 5, wherein the gypsum powder is ground to a specific surface area of 320-450 m/kg.
7. The high temperature and erosion resistant oil well cement as claimed in claim 1, wherein said in situ tough oil well cement synthesized from tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite comprises in chemical composition:
SiO2：20.70-21.10%，
Al2O3：4.10-4.20%，
Fe2O3：5.50-6.00%，
CaO：62.50-62.80%，
MgO：1.25-1.30%，
SO3：2.35-2.45%，
and a trace amount of K2O、Na2O and TiO2 。
8. The high temperature and corrosion resistant oil well cement of claim 7, wherein the in situ toughness oil well cement has a 7d strength of 49MPa at 90-150 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015170685A1 (en) * | 2014-05-07 | 2015-11-12 | 電気化学工業株式会社 | Cementing composition, cementing method and well drilling method |
| CN105967600A (en) * | 2016-05-25 | 2016-09-28 | 西南石油大学 | Endogenous toughened corrosion-resistant cement mortar system |
| CN108675752A (en) * | 2018-06-19 | 2018-10-19 | 葛洲坝石门特种水泥有限公司 | A kind of high-strength high temperature resistant anti-erosion oil-well cement and preparation method thereof |
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| CN113582605A (en) * | 2021-06-30 | 2021-11-02 | 中国石油大学(华东) | High-temperature-resistant well cementation cement system and preparation method thereof |
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2021
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| WO2015170685A1 (en) * | 2014-05-07 | 2015-11-12 | 電気化学工業株式会社 | Cementing composition, cementing method and well drilling method |
| CN105967600A (en) * | 2016-05-25 | 2016-09-28 | 西南石油大学 | Endogenous toughened corrosion-resistant cement mortar system |
| CN108675752A (en) * | 2018-06-19 | 2018-10-19 | 葛洲坝石门特种水泥有限公司 | A kind of high-strength high temperature resistant anti-erosion oil-well cement and preparation method thereof |
| CN108751753A (en) * | 2018-07-16 | 2018-11-06 | 中国建筑材料科学研究总院有限公司 | High temperature cementing concrete and high temperature cementing slurry |
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