CN112500842A - Preparation method of horizontal well cementing cement slurry - Google Patents
Preparation method of horizontal well cementing cement slurry Download PDFInfo
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- CN112500842A CN112500842A CN202110027415.8A CN202110027415A CN112500842A CN 112500842 A CN112500842 A CN 112500842A CN 202110027415 A CN202110027415 A CN 202110027415A CN 112500842 A CN112500842 A CN 112500842A
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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Abstract
A preparation method of horizontal well cementing cement slurry is characterized by comprising the following components in parts by weight: 1 part of oil well cement, 1-1.5 parts of sand, 0.5-0.6 part of silica fume, 0.1-0.2 part of steel slag, 0.1-0.15 part of drag reducer, 0.05-0.08 part of defoamer, 0.03-0.05 part of fluid loss additive, 0.02-0.03 part of early strength agent, 0.01-0.02 part of dispersant, 0.01-0.02 part of water reducer and 0.5-0.6 part of water. The free water is effectively prevented from being gathered on the upper side of the well wall to form a water tank or a water belt, and the defoaming agent has good compatibility with the defoaming agent.
Description
Technical Field
The invention relates to a preparation method of horizontal well cementing cement slurry, belonging to the field of well cementing.
Background
Along with the continuous exploration and development of oil fields, the exploitation difficulty is gradually increased, the yield and the productivity of a single well are gradually lowered, and in order to improve the recovery ratio and the exploitation degree, horizontal well development technologies are adopted in each oil field and are increasingly emphasized by the oil fields. The horizontal well cementing cement slurry system needs cement slurry with better fluidity, and the free water released by the currently added drag reducer is too much, so that a large amount of free water is gathered on the upper side of the well wall in a horizontal well section to form a water tank or a water belt, sufficient strength cannot be effectively formed, and finally oil gas channeling can be caused. And air bubbles are generated during the stirring process to cause the poor flowability of the cement paste.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides horizontal well cementing cement slurry for ensuring the fluidity of the horizontal well cementing cement slurry and improving the mechanical property of the cement slurry;
the well cementation operation cement slurry consists of the following components in parts by mass: 1 part of oil well cement, 1-1.5 parts of sand, 0.5-0.6 part of silica fume, 0.1-0.2 part of steel slag, 0.1-0.15 part of drag reducer, 0.05-0.08 part of defoamer, 0.03-0.05 part of fluid loss additive, 0.02-0.03 part of early strength admixture, 0.01-0.02 part of dispersant, 0.01-0.02 part of water reducer and 0.5-0.6 part of water,
the preparation method comprises the following implementation steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding the materials into a reaction container, introducing nitrogen and stirring for 20-30 minutes, heating in a water bath to 60-70 ℃ for reacting for 30-40 minutes, cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 20-30% of the mass of the isoamylol polyoxyethylene ether, the adding amount of N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 5-10% of the mass of the prenol polyoxyethylene ether,
(2) preparing the defoaming agent: sequentially adding 20-30 parts of polydimethylsiloxane and 10-15 parts of trifluoropropylmethylcyclotrisiloxane into a flask, uniformly stirring by magnetic force, dropwise adding span 80 at a speed of 2-5 ml/min, heating to 50-60 ℃ after dropwise adding, stirring for 10-15 min, then adding 20-30 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8, and obtaining the defoaming agent.
(3) Mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
The preferable preparation method of the horizontal well cementing cement slurry is that the specific surface area of the silica fume is 400m2/kg-800m2/kg, particle size 500-1000 mesh.
The preferable preparation method of the horizontal well cementing cement slurry is that the particle size of the silica fume is 500-1000 meshes.
The preferable preparation method of the horizontal well cementing cement slurry is that the average grain size of the steel slag is less than 100 mu m, the content of SiO2 in the steel slag is 20-30%, and the content of calcium oxide is 10-15%.
Preferably, the oil well cement is G-grade cement.
The preferable preparation method of the horizontal well cementing cement slurry comprises the following steps of adding 4-hydroxybutyl vinyl ether in an amount which is 25% of the mass of the prenyl alcohol polyoxyethylene ether, adding N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole in an amount which is 10% of the mass of the prenyl alcohol polyoxyethylene ether,
the preferable preparation method of the horizontal well cementing cement slurry is that the mole ratio of the prenyl alcohol polyoxyethylene ether, the citric acid, the 2, 4-toluene diisocyanate and the acetone is 100:30:55:120
The preferable preparation method of the horizontal well cementing cement slurry is that the mass ratio of polydimethylsiloxane to trifluoropropylmethylcyclotrisiloxane is 2: 1.
according to the preferable preparation method of the horizontal well cementing cement slurry, the dropping amount of the span-80 is 10-15% of the mass of the polydimethylsiloxane, and the dropping speed is controlled at 5 ml/min.
According to the preferable preparation method of the horizontal well cementing cement slurry, the mass ratio of the polyethylene glycol to the polydimethylsiloxane is 1: 1.
The drag reducer has stronger adsorption groups, can be quickly adsorbed on the surfaces of cement particles, effectively disperses the cementing structure of the cement particles by adjusting the surface charges of the cement particles, improves the rheological property of cement paste, realizes pumpable cement paste, has good dispersibility, does not influence the sedimentation stability of the cement paste, and cannot generate excessive free liquid. The free water is effectively prevented from being gathered on the upper side of the well wall to form a water tank or a water belt, and the defoaming agent has good compatibility with the defoaming agent. The defoaming agent can be rapidly diffused in a cement paste system, the strength of a gas surface film generated during cement paste stirring can be effectively weakened, a double-layer film is formed on a foam wall during diffusion, and a surfactant with a stabilizing effect is discharged in the diffusion process, so that the local surface tension of foam is reduced, the self-healing effect of the foam is damaged, and the foam is broken. The air is removed, the porosity of the set cement is reduced, the strength of the set cement is improved, the viscosity of the cement paste is reduced, and the flow resistance is reduced.
Detailed Description
Well cementation cement slurry prepared in examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Density, g/cm3 | 2.4 | 2.3 | 2.5 | 2.4 | 1.9 | 1.85 |
| Flow/cm | 22 | 21 | 21 | 23 | 17 | 15 |
| Initial consistency, Bc | 22 | 22 | 24 | 23 | 28 | 27 |
| Free solution, mL | 3 | 4 | 5 | 3 | 3 | 4 |
| Compressive strength MPa 60 ℃ for 24h | 23.3 | 24.6 | 24.7 | 23.2 | 19.5 | 19.5 |
| Flexural strength MPa 60 ℃ for 24h | 9.4 | 9.7 | 10.2 | 10.5 | 6.54 | 6.95 |
Example 1
The preparation method of the horizontal well cementing cement slurry is characterized in that the cementing operation cement slurry consists of the following components in parts by mass: 1 part of oil well cement, 1.2 parts of sand, 0.5 part of silica fume, 0.1 part of steel slag, 0.1 part of drag reducer, 0.07 part of defoamer, 0.05 part of fluid loss additive, 0.02 part of early strength admixture, 0.02 part of dispersant, 0.01 part of water reducer and 0.5 part of water,
the preparation method comprises the following implementation steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding into a reaction container, wherein the molar ratio of the isoamylol polyoxyethylene ether to the citric acid to the 2, 4-toluene diisocyanate to the acetone is 100:25:55:120, introducing nitrogen, stirring for 20-30 minutes, heating in a water bath to 60 ℃, reacting for 30 minutes, cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 20% of the mass of the isoamylol polyoxyethylene ether, and the N- [3- (triethoxysilyl) propyl ] -4, the adding amount of the 5-dihydroimidazole is 5 percent of the mass of the prenol polyoxyethylene ether,
(2) preparing the defoaming agent: sequentially adding 30 parts of polydimethylsiloxane and 10 parts of trifluoropropylmethylcyclotrisiloxane into a flask, uniformly stirring by magnetic force, dropwise adding span-80 at a speed of 3 ml/min, heating to 50 ℃ after dropwise adding, stirring for 10 min, then adding 20 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8, and thus obtaining the defoaming agent.
(3) Mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
Example 2
The preparation method of the horizontal well cementing cement slurry is characterized in that the cementing operation cement slurry consists of the following components in parts by mass: 1 part of oil well cement, 1.5 parts of sand, 0.6 part of silica fume, 0.2 part of steel slag, 0.12 part of drag reducer, 0.07 part of defoamer, 0.03 part of fluid loss additive, 0.02 part of early strength agent, 0.02 part of dispersant, 0.02 part of water reducer and 0.6 part of water,
the preparation method comprises the following implementation steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding the materials into a reaction container, wherein the molar ratio of the isoamylol polyoxyethylene ether to the citric acid to the 2, 4-toluene diisocyanate to the acetone is 100:30:60:115, introducing nitrogen, stirring for 25 minutes, heating in a water bath, heating to 65 ℃, reacting for 35 minutes, cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 30% of the mass of the isoamylol polyoxyethylene ether, the adding amount of the N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 10% of the mass of the isoamylol polyoxyethylene ether,
(2) preparing the defoaming agent: sequentially adding 20 parts of polydimethylsiloxane and 10 parts of trifluoropropylmethylcyclotrisiloxane into a flask, uniformly stirring by magnetic force, dropwise adding span-80 at a speed of 2 ml/min, heating to 55 ℃ after dropwise adding, stirring for 10 min, then adding 25 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8, and thus obtaining the defoaming agent.
(3) Mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
Example 3
The preparation method of the horizontal well cementing cement slurry is characterized in that the cementing operation cement slurry consists of the following components in parts by mass: 1 part of oil well cement, 1.5 parts of sand, 0.6 part of silica fume, 0.2 part of steel slag, 0.15 part of drag reducer, 0.06 part of defoamer, 0.04 part of fluid loss additive, 0.03 part of early strength admixture, 0.02 part of dispersant, 0.02 part of water reducer and 0.6 part of water,
the preparation method comprises the following implementation steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding the materials into a reaction container, wherein the molar ratio of the isoamylol polyoxyethylene ether to the citric acid to the 2, 4-toluene diisocyanate to the acetone is 100:20:55:135, introducing nitrogen, stirring for 30 minutes, heating in a water bath, heating to 70 ℃, reacting for 30 minutes, cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 30% of the mass of the isoamylol polyoxyethylene ether, the adding amount of the N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 8% of the mass of the isoamylol polyoxyethylene ether,
(2) preparing the defoaming agent: adding 25 parts of polydimethylsiloxane and 15 parts of trifluoropropylmethylcyclotrisiloxane into a flask in sequence, uniformly stirring by magnetic force, dropwise adding span-80 at a speed of 4 ml/min, heating to 60 ℃ after dropwise adding, stirring for 12 min, adding 28 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8, and thus obtaining the defoaming agent.
(3) Mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
Example 4
The preparation method of the horizontal well cementing cement slurry is characterized in that the cementing operation cement slurry consists of the following components in parts by mass: 1 part of oil well cement, 1.4 parts of sand, 0.6 part of silica fume, 0.15 part of steel slag, 0.15 part of drag reducer, 0.08 part of defoamer, 0.03 part of fluid loss additive, 0.03 part of early strength agent, 0.01 part of dispersant, 0.01 part of water reducer and 0.6 part of water,
the preparation method comprises the following implementation steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding into a reaction container, wherein the molar ratio of the isoamylol polyoxyethylene ether to the citric acid to the 2, 4-toluene diisocyanate to the acetone is 100:30:60: 150, introducing nitrogen and stirring for 20 minutes, heating in a water bath to 65 ℃ to react for 40 minutes, then cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 24% of the mass of the isoamylol polyoxyethylene ether, the adding amount of the N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 6% of the mass of the isoamylol polyoxyethylene ether,
(2) preparing the defoaming agent: adding 26 parts of polydimethylsiloxane and 15 parts of trifluoropropylmethylcyclotrisiloxane into a flask in sequence, uniformly stirring by magnetic force, dropwise adding span-80 at a speed of 5 ml/min, heating to 60 ℃ after dropwise adding, stirring for 10 min, adding 30 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8, and thus obtaining the defoaming agent.
(3) Mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
Comparative example 1
A well cementation cement slurry is composed of the following components in parts by mass: 1 part of oil well cement, 1.2 parts of sand, 0.5 part of silica fume, 0.1 part of steel slag, 0.1 part of drag reducer, 0.07 part of defoamer, 0.05 part of fluid loss additive, 0.02 part of early strength admixture, 0.02 part of dispersant, 0.01 part of water reducer and 0.5 part of water,
and selecting a commercial cement paste drag reducer and a defoaming agent.
Comparative example 2
A well cementation cement slurry is composed of the following components in parts by mass: 1 part of oil well cement, 1.5 parts of sand, 0.6 part of silica fume, 0.2 part of steel slag, 0.12 part of drag reducer, 0.07 part of defoamer, 0.03 part of fluid loss additive, 0.02 part of early strength agent, 0.02 part of dispersant, 0.02 part of water reducer and 0.6 part of water,
and selecting a commercial cement paste drag reducer and a defoaming agent.
The present invention provides a method for preparing horizontal well cementing cement slurry, which has been described in the embodiments, and it is obvious to those skilled in the art that the technique of the present invention can be implemented by modifying or appropriately changing and combining the construction methods described herein without departing from the content, spirit and scope of the present invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.
Claims (10)
1. A preparation method of horizontal well cementing cement slurry is characterized by comprising the following components in parts by weight: 1 part of oil well cement, 1-1.5 parts of sand, 0.5-0.6 part of silica fume, 0.1-0.2 part of steel slag, 0.1-0.15 part of drag reducer, 0.05-0.08 part of defoamer, 0.03-0.05 part of fluid loss additive, 0.02-0.03 part of early strength admixture, 0.01-0.02 part of dispersant, 0.01-0.02 part of water reducer and 0.5-0.6 part of water,
the preparation method comprises the following steps:
(1) preparing the drag reducer: weighing isoamylol polyoxyethylene ether, citric acid, 2, 4-toluene diisocyanate and acetone, sequentially adding the materials into a reaction container, introducing nitrogen and stirring for 20-30 minutes, heating in a water bath to 60-70 ℃ for reacting for 30-40 minutes, cooling to room temperature, adding 4-hydroxybutyl vinyl ether and N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole, fully mixing and stirring, standing for 2 hours, filtering to remove precipitates to obtain a drag reducer, wherein the adding amount of the 4-hydroxybutyl vinyl ether is 20-30% of the mass of the isoamylol polyoxyethylene ether, the adding amount of N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 5-10% of the mass of the prenol polyoxyethylene ether,
(2) preparing the defoaming agent: sequentially adding 20-30 parts of polydimethylsiloxane and 10-15 parts of trifluoropropylmethylcyclotrisiloxane into a flask, uniformly stirring by magnetic force, dropwise adding span-80 at a speed of 2-5 ml/min, heating to 50-60 ℃ after dropwise adding, stirring for 10-15 min, adding 20-30 parts of polyethylene glycol, stirring at a constant speed, adjusting the pH value to 8 to obtain a defoaming agent,
(3) mixing cement slurry: mixing oil well cement, sand, silica fume and steel slag according to a proportion, mixing the mixture with water to prepare slurry, then adding the drag reducer, the defoamer, the fluid loss additive, the early strength additive, the dispersant and the water reducer, and uniformly stirring to obtain the horizontal well cementing cement slurry.
2. The preparation method of the horizontal well cementing cement slurry as claimed in claim 1, wherein the specific surface area of the silica fume is 400m2/kg-800m2/kg, particle size 500-1000 mesh.
3. The preparation method of the horizontal well cementing cement slurry as claimed in claim 1, wherein the silica fume particle size is 500-1000 meshes.
4. The preparation method of the horizontal well cementing cement slurry as claimed in claim 4, wherein the average particle size of the steel slag is less than 100 μm, the content of SiO2 in the steel slag is 20-30%, and the content of calcium oxide is 10-15%.
5. The method for preparing the horizontal well cementing cement slurry according to claim 1, wherein the oil well cement is G-grade cement.
6. The preparation method of the horizontal well cementing cement slurry as claimed in claim 1, wherein the addition amount of the 4-hydroxybutyl vinyl ether is 25% of the mass of the prenyl alcohol polyoxyethylene ether, and the addition amount of the N- [3- (triethoxysilyl) propyl ] -4, 5-dihydroimidazole is 10% of the mass of the prenyl alcohol polyoxyethylene ether.
7. The preparation method of the horizontal well cementing cement slurry as claimed in claim 1, wherein the mole ratio of the prenyl alcohol polyoxyethylene ether, the citric acid, the 2, 4-toluene diisocyanate and the acetone is 100:30:55: 120.
8. The preparation method of the horizontal well cementing cement slurry according to claim 1, wherein the mass ratio of polydimethylsiloxane to trifluoropropylmethylcyclotrisiloxane is 2: 1.
9. the preparation method of the horizontal well cementing cement slurry according to claim 1, wherein the dropping amount of the span-80 is 10-15% of the mass of the polydimethylsiloxane, and the dropping speed is controlled at 5 ml/min.
10. The preparation method of the horizontal well cementing cement slurry according to claim 1, wherein the mass ratio of the polyethylene glycol to the polydimethylsiloxane is 1: 1.
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