CN107964398B - Low liquid-solid ratio oil well cement slurry and preparation method thereof - Google Patents
Low liquid-solid ratio oil well cement slurry and preparation method thereof Download PDFInfo
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- CN107964398B CN107964398B CN201610916359.2A CN201610916359A CN107964398B CN 107964398 B CN107964398 B CN 107964398B CN 201610916359 A CN201610916359 A CN 201610916359A CN 107964398 B CN107964398 B CN 107964398B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—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
- C09K8/493—Additives for reducing or preventing gas migration
Abstract
The invention discloses oil well cement slurry with a low liquid-solid ratio and a preparation method thereof. The oil well cement slurry is prepared from the following raw materials: the components are calculated according to the parts by weight: 100 parts of oil well cement; 10-25 parts of spheroidized silicon powder; 0-20 parts of common silicon powder; wherein the total amount of spheroidized silicon powder and common silicon powder is 20-40 parts; 1-5 parts of a liquid oil well cement fluid loss agent; 0.1-1.0 part of oil well cement dispersant; 49-54 parts of water, wherein the total parts of the oil well cement fluid loss additive and the water are 50-55 parts; the average grain diameter of the spheroidized silicon powder is between 110 and 180 mu m, and the sphericity is more than 0.9; the average grain diameter of the common silicon powder is between 10 and 70 mu m. The low liquid-solid ratio gas channeling prevention cement slurry system based on the spherical silica powder has the advantages that the formed cement slurry is good in flowability and low in permeability, the strength of the set cement is improved, the well cementation cost is effectively reduced, and the channeling prevention capability and durability of the set cement are improved.
Description
Technical Field
The invention relates to the field of oil and gas wells, in particular to oil well cement slurry with a low liquid-solid ratio and a preparation method thereof.
Background
Along with the fact that the phenomenon of annulus pressure of a gas well is more and more common, the gas channeling prevention capability of cement paste and the sealing quality and durability of a cement sheath are more and more valued in the industry. Aiming at the current high-temperature and high-pressure gas wells, oil wells and other complex wells, in order to effectively improve the anti-channeling capacity of the set cement, the oil well cement admixture and the admixture with special functions are adopted to improve the performance of the set cement, materials such as latex and the like are usually adopted to increase the air resistance of the cement paste, effectively reduce the permeability of the cement paste, improve the anti-channeling effect of the cement paste and enhance the durability of the set cement; the second method adopts a non-base nano filling material, improves the compactness of the set cement, and enhances the channeling-proof capability and durability of the cement slurry; the third method adopts a close packing technology, improves the compactness of the set cement and improves the performance of the cement paste; the fourth method adopts a matched well cementation process technology to realize effective ground stabilization.
Although the technology has better application effect in field application, the latex and the inorganic nano material are adopted for filling, so that the well cementation cost is obviously increased, meanwhile, the tight packing technology is difficult to be widely applied due to the difference of cement and the complexity of cement slurry design, and a matched anti-channeling well cementation process usually needs a well cementation cement slurry system with excellent performance so as to obtain good application effect.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides oil well cement slurry with a low liquid-solid ratio and a preparation method thereof. Compared with a cement slurry system with the same performance, the cement slurry system can effectively reduce the well cementation cost and effectively improve the anti-channeling capacity and the durability of the set cement.
One of the purposes of the invention is to provide a low liquid-solid ratio high-performance anti-channeling oil well cement slurry formula.
The oil well cement slurry is prepared from the following raw materials:
the components are calculated according to the parts by weight:
100 parts of G-grade oil well cement;
10-25 parts of spheroidized silicon powder, preferably 15-25 parts;
0-20 parts of common silicon powder, preferably 10-20 parts;
wherein the total amount of spheroidized silicon powder and common silicon powder is 20-40 parts; preferably 35-40 parts;
1-5 parts of a liquid oil well cement fluid loss agent, preferably 2-4 parts;
0.1-1.0 part of oil well cement dispersant;
49-54 parts of water;
wherein the total parts of the oil well cement fluid loss agent and the water are 50-55 parts;
the average grain diameter of the spheroidized silicon powder is between 110 and 180 mu m, and the sphericity is more than 0.8; the spheroidized silicon powder is formed by utilizing high-purity common superfine silicon powder and adopting a plasma technology to spheroidize, the silicon powder with higher sphericity is formed, and a proper amount of the materials are added, so that the ball effect is improved, the cement paste fluidity is improved, the water cement ratio is reduced, and the cement paste performance index is integrally improved.
The average grain diameter of the common silicon powder is between 10 and 70 mu m;
one or a combination of 2-acrylamide-2-methylpropanesulfonic acid (terpolymer AMPS and binary copolymer AMPS) and polyvinyl alcohol (borax cross-linked PVA) of the liquid oil well cement fluid loss agent, preferably polyvinyl alcohol;
the oil well cement dispersant is one or a combination of formaldehyde acetone condensation polymer and polycarboxylic acid (sulfonated formaldehyde acetone polycondensate SAF, polyacrylic acid).
The water-solid ratio of the oil well cement slurry is 0.38-0.40, the permeability of set cement is less than 0.05mD, and the SPN is less than 2.
In the existing cement paste system, if the experimental temperature exceeds 110 ℃, silicon powder must be added. At present, no spherical silicon powder is added in cement paste; the spheroidization of the silicon powder has the following functions: after the silicon powder with the irregular shape is spheroidized, the ball effect of the silicon powder in cement can be enhanced, the fluidity of cement paste is increased, the liquid-solid ratio is reduced, and the performance of a sand-added cement paste system is improved.
The invention also aims to provide a preparation method of the oil well cement slurry with the low liquid-solid ratio.
The components are stirred and mixed according to the using amount to prepare the low liquid-solid ratio oil well cement slurry.
Cement paste prepared by GB/T19139-2012 oil well cement test method
(1) Weighing powder materials according to the component proportion, and mixing;
(2) weighing the liquid admixture and water according to the proportion
(3) Stirring the liquid admixture and water in a stirrer at the rotating speed of 1000-2000rpm for 30-60 s;
(4) slowly pouring the powder material into a stirrer at the rotating speed of 4000 revolutions per minute for less than 30 s;
(5) stirring cement slurry for 50s at 10000 r/min;
(6) stopping stirring to form oil well cement slurry with low liquid-solid ratio
Compared with the prior art, the invention has the beneficial effects that:
(1) the water-solid ratio of the formed cement paste system is lower than that of the similar cement paste;
(2) the formed cement paste system has the permeability lower than 0.05mD and high strength;
(3) the cost of the formed cement paste system is effectively reduced compared with the same type of cement paste system;
(4) compared with the conventional cement paste, the durability of the set cement is improved;
(5) compared with the conventional cement paste, the gas channeling prevention capability of the set cement is improved;
(6) compared with the conventional cement paste, the sealing capability of the cement stone annular space is improved.
Drawings
FIG. 1 is an electron microscope image of spheroidized silicon powder;
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
100 parts of Jiahua G-grade oil well cement, 15 parts of spheroidized silicon powder with the average particle size of 180 mu m, the sphericity of 0.9(S-SiOball-180, produced by Texas continental shelf company) and 20 parts of common silicon powder with the average particle size of 70 mu m (S-SiO-70, produced by Texas continental shelf company) are mixed uniformly in advance; weighing 2 parts of oil well cement fluid loss additive (DZJ-Y, produced by Texas continental shelf company), weighing 1.0 part of oil well cement dispersant (DZS, produced by Texas continental shelf company), weighing 49 parts of clear water, wherein the total water-solid ratio of the system is as follows: 0.385, sequentially pouring clear water, a fluid loss agent and a dispersing agent into a stirring slurry cup, stirring for 30-60s at the rotating speed of 1000-2000rpm, adjusting the rotating speed of a stirrer to 4000rpm, pouring cement mixed with silicon powder into the stirring slurry cup within 30s, adjusting the rotating speed to 10000rpm after the cement is poured into the slurry cup, and stirring at a high speed for 50 s; setting the temperature of an atmospheric densification instrument to be 93 ℃, pouring prepared cement paste into a thickening instrument paste cup, curing for 20min, measuring the rheological property of the cement paste by adopting a six-speed viscometer, measuring the flow pattern index n of the cement paste to be 0.71, pouring the cured cement paste into a strength curing grinding tool, putting the cured cement paste into a high-temperature high-pressure curing kettle, setting the curing pressure and temperature to be 20MPa and 130 ℃, measuring the gas permeability of cement stones to be 0.03mD after 48 hours, measuring the strength of the cement stones to be 37.3MP a, and measuring and calculating the SPN to be 1; 500ml of cement slurry was prepared in the same manner, and the swelling shrinkage of the set cement in 7 days was measured to be 0.04% by a Qiandele 4268ES type cement shrinkage/expansion instrument, which is expressed as a slight swelling. The long-term sealing performance evaluation device of the CP-1 type cement sheath is adopted to evaluate the durability of the cement sheath under stress fatigue, and the cement sheath has good sealing capability within 100 periods under the conditions of 35MPa stress alternation and 50 ℃ temperature alternation.
Example 2
100 parts of Jiahua G-grade oil well cement, 25 parts of spheroidized silicon powder with the average particle size of 110 mu m, the sphericity of 0.9(S-SiOball-110, produced by Texas continental shelf company) and 10 parts of common silicon powder with the average particle size of 10 mu m (S-SiO-10, produced by Texas continental shelf company) are mixed uniformly in advance; weighing 4 parts of oil well cement fluid loss additive (DZJ-Y, produced by Texas continental shelf company), weighing 0.1 part of oil well cement dispersant (DZS, produced by Texas continental shelf company), weighing 54 parts of clear water, wherein the total water-solid ratio of the system is 0.429, sequentially pouring the clear water, the fluid loss additive and the dispersant into a stirring slurry cup, stirring for 30-60s at the rotation speed of 1000 plus 2000rpm, adjusting the rotation speed of a stirrer to 4000rpm, pouring cement mixed with silicon powder into the stirring slurry cup within 30s, adjusting the rotation speed to 10000rpm after the cement is poured into the slurry cup, and stirring for 50s at a high speed; setting the temperature of an atmospheric densification instrument to be 93 ℃, pouring prepared cement paste into a thickening instrument paste cup, curing for 20min, measuring the rheological property of the cement paste by adopting a six-speed viscometer, measuring the flow pattern index n of the cement paste to be 0.65, pouring the cured cement paste into a strength curing grinding tool, putting the cured cement paste into a high-temperature high-pressure curing kettle, setting the curing pressure and temperature to be 20MPa and 130 ℃, measuring the gas permeability of cement stones to be 0.04mD after 48 hours, measuring the strength of the cement stones to be 35.2Mpa, and measuring and calculating the SPN to be 1.5; 500ml of cement slurry was prepared in the same manner, and the swelling shrinkage of the set cement in 7 days was measured to be 0.02% by a Qiandele 4268ES type cement shrinkage/expansion instrument, which is expressed as a slight swelling. The long-term sealing performance evaluation device of the CP-1 type cement sheath is adopted to evaluate the durability of the cement sheath under stress fatigue, and the cement sheath has good sealing capability within 100 periods under the conditions of 35MPa stress alternation and 50 ℃ temperature alternation.
Comparative example 1
Mixing 100 parts by weight of Jiahua G-grade oil well cement and 35 parts of common silicon powder (S-SiO-70, produced by Darland, Tex.) with the average particle size of 70 μm in advance; weighing 4 parts of oil well cement fluid loss additive (DZJ-Y, produced by Texas continental shelf company), weighing 0.5 part of oil well cement dispersant (DZS, produced by Texas continental shelf company), weighing 55.4 parts of clear water (water-solid ratio 0.44), sequentially pouring the clear water, the fluid loss additive and the dispersant into a stirring slurry cup, stirring for 30-60s at the rotation speed of 1000 plus 2000rpm, adjusting the rotation speed of a stirrer to 4000rpm, pouring cement mixed with silicon powder into the stirring slurry cup within 30s, adjusting the rotation speed to 10000rpm after the cement is poured into the slurry cup, and stirring for 50s at a high speed; setting the temperature of an atmospheric pressure densitometer to be 93 ℃, pouring prepared cement slurry into a slurry cup of the densitometer, curing for 20min, measuring the rheological property of the cement slurry by adopting a six-speed viscometer, measuring the flow pattern index n of the cement slurry to be 0.75, pouring the cured cement slurry into a strength curing grinding tool, putting the cured cement slurry into a high-temperature high-pressure curing kettle, setting the curing pressure and temperature to be 20MPa and 130 ℃, measuring the gas permeability of cement paste to be 0.24mD after 48h, and setting the strength of the cement paste to be 21.4 MPa; 500ml of cement slurry was prepared in the same manner, and the shrinkage of the set cement measured by a Qiandele 4268ES type cement shrinkage/expansion instrument was-0.18% in 7 days, which was expressed as shrinkage. The evaluation of the durability of the cement sheath under stress fatigue is carried out by adopting a CP-1 type cement sheath long-term sealing evaluation device, and gas channeling occurs in 13 periods of the cement sheath under the conditions of 35MPa stress alternation and 50 ℃ temperature alternation.
Comparative example 2
Mixing 100 parts by weight of Jiahua G-grade oil well cement and 35 parts of common silicon powder (S-SiO-70, produced by Darland, Tex.) with the average particle size of 70 μm in advance; weighing 4 parts of oil well cement fluid loss agent (DZJ-Y, produced by Texas continental shelf company), 0.5 part of oil well cement dispersant (DZS, produced by Texas continental shelf company), 15 parts of styrene-butadiene latex (DC200, produced by Texas continental shelf company), 40.4 parts of clear water (liquid-solid ratio 0.44), sequentially pouring the clear water, the styrene-butadiene latex, the fluid loss agent and the dispersant into a stirring slurry cup, stirring for 30-60s at the rotating speed of 1000-2000rpm, adjusting the rotating speed of a stirrer to 4000rpm, pouring the cement mixed with silicon powder into the stirring slurry cup within 30s, and after pouring the cement into the slurry cup, adjusting the rotating speed to 10000rpm and stirring for 50s at a high speed; setting the temperature of an atmospheric densification instrument to be 93 ℃, pouring the prepared cement paste into a thickening instrument paste cup, curing for 20min, measuring the rheological property of the cement paste by adopting a six-speed viscometer, measuring the flow pattern index n of the cement paste to be 0.61, pouring the cured cement paste into a strength curing grinding tool, putting the cured cement paste into a high-temperature high-pressure curing kettle, setting the curing pressure and temperature to be 20MPa and 130 ℃, measuring the gas permeability of the cement paste to be 0.08mD after 48 hours, and setting the strength of the cement paste to be 24.4 MPa; 500ml of cement slurry was prepared in the same manner, and the swelling shrinkage of cement paste measured by a Qiandele 4268ES type cement shrinkage/expansion instrument for 7 days was 0.05%, which was expressed as micro-swelling. Carrying out durability evaluation on the cement sheath under stress fatigue by adopting a CP-1 type cement sheath long-term sealing evaluation device, wherein the cement sheath does not generate gas channeling in 100 periods of the cement sheath under the conditions of 35MPa stress alternation and 50 ℃ temperature alternation;
the conventional cement paste in the embodiment 1, the embodiment 2 and the comparative example 1 shows that when the spherical silica powder is adopted, the permeability of the set cement is obviously reduced when the solid-to-solid ratio of the cement paste is effectively reduced, the reduction amplitude reaches 82.14%, the strength of the set cement is improved by 39.2% in 48 hours, the fatigue cycle is improved to more than 100 cycles, and the durability of the cement sheath can be effectively improved.
Compared with the latex cement paste in the comparative example 2, the latex cement paste in the example has the same cement stone permeability and the same cement stone durability, but the spherical silicon powder can obviously reduce the cement paste cost.
Claims (5)
1. The low liquid-solid ratio oil well cement slurry is characterized by being prepared from the following raw materials:
the components are calculated according to the parts by weight:
100 parts of oil well cement;
10-25 parts of spheroidized silicon powder;
10-20 parts of common silicon powder;
wherein the total amount of spheroidized silicon powder and common silicon powder is 20-40 parts;
1-5 parts of a liquid oil well cement fluid loss agent;
0.1-1.0 part of oil well cement dispersant;
49-54 parts of water;
wherein the total parts of the oil well cement fluid loss agent and the water are 50-55 parts;
the average grain diameter of the spheroidized silicon powder is between 110 and 180 mu m, and the sphericity is more than 0.8;
the spheroidized silicon powder is formed by utilizing high-purity common superfine silicon powder and adopting a plasma technology;
the average grain diameter of the common silicon powder is between 10 and 70 mu m;
the liquid oil well cement fluid loss agent is one or a combination of 2-acrylamide-2-methylpropanesulfonic acid and polyvinyl alcohol;
the oil well cement dispersant is one or a combination of formaldehyde acetone condensation and polycarboxylic acid.
2. The low liquid-to-solid ratio oil-well cement slurry of claim 1, wherein:
15-20 parts of spheroidized silicon powder;
10-20 parts of common silicon powder;
the total amount of spheroidized silicon powder and common silicon powder is 35-40 parts;
2-4 parts of a fluid loss agent for liquid oil well cement.
3. The low liquid-to-solid ratio oil-well cement slurry of claim 1, wherein:
the liquid oil well cement fluid loss agent is polyvinyl alcohol.
4. The low liquid-solid ratio oil well cement slurry as claimed in any one of claims 1 to 3, wherein:
the water-solid ratio of the oil well cement slurry is 0.38-0.40, the permeability of set cement is less than 0.05mD, and the SPN is less than 2.
5. A method of preparing a low liquid-to-solid ratio oil well cement slurry as claimed in any one of claims 1 to 4, said method comprising:
the components are stirred and mixed according to the using amount to prepare the low liquid-solid ratio oil well cement slurry.
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