CN116496030A - Cement paste system suitable for cement plugs of high-inclination sections and horizontal sections and preparation method thereof - Google Patents
Cement paste system suitable for cement plugs of high-inclination sections and horizontal sections and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 173
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 230000002745 absorbent Effects 0.000 claims abstract description 8
- 239000002250 absorbent Substances 0.000 claims abstract description 8
- 239000000499 gel Substances 0.000 claims description 38
- 239000008247 solid mixture Substances 0.000 claims description 20
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 19
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 19
- 238000007334 copolymerization reaction Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 239000010881 fly ash Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000011324 bead Substances 0.000 claims description 13
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 239000003129 oil well Substances 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000007580 dry-mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 229920000881 Modified starch Polymers 0.000 claims description 5
- 239000004368 Modified starch Substances 0.000 claims description 5
- 235000019426 modified starch Nutrition 0.000 claims description 5
- -1 aldehyde ketone Chemical class 0.000 claims description 4
- 239000000017 hydrogel Substances 0.000 claims description 4
- 230000009974 thixotropic effect Effects 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 2
- 238000010009 beating Methods 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 239000004575 stone Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 230000008719 thickening Effects 0.000 description 6
- 239000007924 injection Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229910021487 silica fume Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013008 thixotropic agent Substances 0.000 description 2
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013270 controlled release Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
- C04B18/082—Cenospheres
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention belongs to the technical field of oilfield chemistry and oil-gas well cementing materials, in particular relates to a cement slurry system suitable for plugging cement at a high-inclination section and a horizontal section and a preparation method thereof, and aims to solve the problem that the existing cement slurry system cannot meet the requirements of low viscosity, low volume shrinkage and strong thixotropic property. The invention provides a cement slurry system suitable for cement plugs of high-inclination sections and horizontal sections, which comprises a cementing system, a fluid loss agent, a retarder, spherical absorbent gel and water; the total amount of the water in the cement slurry system and the water in the spherical water-absorbing gel can lead the water-cement ratio to reach more than 0.48. The cement paste system has low viscosity, low volume shrinkage and strong thixotropic property, and meets the requirements of cement plug beating of a high-inclination section and a horizontal section.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry and oil-gas well cementing materials, and particularly relates to a cement slurry system suitable for plugging high-inclination sections and horizontal sections and a preparation method thereof.
Background
The cement plug injection process is a process technology for replacing a certain amount of cement paste to a certain part of a casing or a well bore to form a new artificial bottom hole meeting engineering requirements or a closed certain well section meeting process requirements, and the cement plug injection process technology is encountered in drilling, well completion construction, underground operation and well repair. The cementing plug is a common construction procedure for underground operation, and along with development of oil fields, especially in the middle and later stages of oil-water well development, implementation of measures such as reservoir reconstruction, oil and injection increase and the like does not leave the cementing plug for construction. The cementing plugs used in the underground operation mainly have the following purposes: (1) Sealing the tested oil layer, returning a new layer of tested oil, or sealing the non-target layer when layering operation is carried out; (2) closing the bottom aqueous layer; (3) Plugging, plugging channeling, upper casing pressure test and the like are separated and sealed in a certain interval: (4) blocking the abandoned well and backfilling the depleted horizon; (5) Sealing layers (e.g., sealing high pressure layers, toxic and hazardous fluid layers) for safety purposes, etc.
Cement plugs with a large density and a small slurry amount are difficult to fill on a large amount of liquid with a small density in a well. Aiming at the problem of low one-time success rate of the conventional cementing plug construction, each research institution and construction unit are not disconnected with new process technology and downhole tools so as to adapt to the needs of different field conditions. The cement slurry system is one of key factors for determining the quality of the cement plug, and has high requirements on the cement slurry performance for cementing the cement plug due to the special well type of the high-inclination section and the horizontal section. In order to ensure the effective sealing performance of the cement plug and prevent a high-side sealing leakage channel, the water evolution of a cement slurry system is required to be 0, the sedimentation stability is high, and the volume of cement stones is not shrunk; meanwhile, as the cement plug is usually made of thin pipe grouting, the friction resistance in the cementing process is low in order to smoothly implement the cement plug construction, so that the viscosity of a cement slurry system is required to be low; however, low viscosity cement slurries, which are cast along the walls of the well during the high slope and horizontal section setting process, as shown in FIG. 2, affect the quality of the cement plugs and therefore require stronger thixotropic properties.
The water separation, the sedimentation stability and the fluidity are controlled, so that the water addition amount is small, the free water is reduced, the sedimentation stability is improved, the fluidity of the cement paste is affected, and a large amount of drag reducer is required to be added; if the water addition amount is large, the fluidity of the cement slurry is improved, but the water absorption and sedimentation stability of the cement slurry are difficult to control. By comparison, the reduction of the water consumption of the cement paste is beneficial to both water separation and sedimentation stability, and the lost fluidity can be compensated by increasing the addition of the drag reducer. However, the reduction of the water addition amount tends to cause the shrinkage of the set cement. Statistics show that when the cement ratio is less than 0.4, the cement stone volume can obviously shrink. Taking the cement ratio of 0.44 as an example, which is commonly used in the well cementation industry, when the water loss is 50ml, the residual cement ratio in the cement slurry is only 0.35, and the cement slurry is severely self-contracted. When the water-cement ratio reaches more than 0.48, and when the water loss is 50ml, the residual water-cement ratio in the cement slurry can be ensured to reach 0.4. However, too high a water-to-ash ratio in horizontal wells increases the risk of water evolution and sedimentation.
Low viscosity and thixotropic properties are a pair of contradictory properties, and thixotropic properties are typically achieved to some extent by increasing the viscosity of the cement slurry, but cementing plugs are typically constructed with small internal diameter tubing strings, requiring low slurry viscosity to reduce friction, but low cement slurry viscosity, being easily slurried downhole with drilling fluid and cast along the wellbore wall, affecting the cementing plug's packing properties.
Aiming at the cement plug of a highly-deviated well section or a horizontal well section, the requirements of low viscosity, low volume shrinkage and strong thixotropic property are integrated on the cement slurry performance, and the existing cement slurry system can hardly meet the requirements.
Disclosure of Invention
The invention provides a cement paste system suitable for cementing plugs in a high-inclination section and a horizontal section, which is used for effectively solving the problem that the existing cement paste system cannot meet the requirements of low viscosity, low volume shrinkage and strong thixotropic property. In order to alleviate the technical problems, the technical scheme provided by the invention is as follows:
a cement slurry system suitable for cement plugs of high-inclination sections and horizontal sections comprises a cementing system, a fluid loss agent, a retarder, spherical water-absorbing gel and water; the total amount of the water in the cement slurry system and the water in the spherical water-absorbing gel can lead the water-cement ratio to reach more than 0.48.
The cement paste system has the advantages that the cement paste ratio is more than 0.48, the chemical shrinkage of the volume of cement paste can be effectively prevented, meanwhile, the excessive moisture in the cement paste is regulated and controlled through the spherical water-absorbing gel, meanwhile, the viscosity of the cement paste is effectively reduced, the shrinkage of the cement paste is prevented, the occurrence of unstable slurry such as water separation and sedimentation is prevented, the viscosity of the cement paste can be obviously reduced through the spherical water-absorbing gel, the fluidity of the cement paste is improved due to the ball effect, and the spherical water-absorbing gel can also be used as a thixotropic agent, so that the cement paste system can realize better thixotropic effect, and therefore, the cement paste system has low viscosity, low volume shrinkage and strong thixotropic property, and meets the requirements of cementing plugs in high-inclination sections and horizontal sections.
Further, the gel system consists of the following components in parts by weight: 100 parts of oil well cement, 25-30 parts of fly ash (sinking beads) and 5-10 parts of micro silicon; preferably, the well cement is a class D well cement.
The micro-silica and the fly ash are extremely fine spherical particles, the hydration is remarkable, a large amount of water is consumed, the cement paste can show macroscopic tackifying phenomenon due to the adsorption of a large amount of water when the cement paste is stood or sheared at low speed, and the ball effect and viscosity reduction can be shown when the cement paste is sheared at high speed, so that the combination of the fly ash (sinking beads) and the micro-silica enables the cement paste to have certain thixotropic property, thereby preventing cement paste from scattering in the process of waiting for solidification and casting along a lower well wall, and having important significance for improving the sealing quality of cement plugs of highly-inclined well sections and horizontal well sections.
Further, the hydrogel of the spherical absorbent gel has a water content of 22.+ -. 5g/g. The sphere diameter of the hydrogel is 50-250 mu m. The spherical water-absorbing gel is prepared by adopting a reversed-phase suspension polymerization method, and is prepared according to the preparation method in Chinese patent CN111807747A, and is specifically prepared by copolymerizing acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (mass ratio is 7:3).
Further, the spherical water-absorbing gel is used in an amount of 10 to 25% by mass of the cement.
The spherical water-absorbing gel prevents the shrinkage of the cement stone by the physical water control effect, the chemical reaction does not occur in the process, and the water in the cement paste is subjected to physical controlled release, but the influence on the cement paste performance is small because the addition amount is low and the water control amount is reasonably designed.
Further, the fluid loss additive is a fluid loss additive prepared by copolymerizing 1.5-5.0 parts of sulfonic acid groups and carboxylic acid groups.
Further, the retarder is 0.5 to 5.0 parts of modified starch type retarder or retarder formed by copolymerization of sulfonic acid group and carboxylic acid group.
Further, at 90-120 ℃, a modified starch retarder is adopted; and (3) adopting a sulfonic acid group and carboxylic acid group copolymerization retarder at 120-150 ℃.
Still further, the cement mortar also comprises a sulfonated aldehyde ketone type dispersing agent, wherein the amount of the dispersing agent is 0.25-2.0% of the mass of the cement.
The preparation method of the cement paste system suitable for the large-inclination section and the horizontal section cementing plugs comprises the following steps:
dry-mixing the fluid loss agent and the gel system to obtain a solid mixture;
adding the spherical water-absorbing gel and the retarder into water for mixing to obtain a liquid mixture;
and stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system.
Further, a dispersant is added when preparing the solid mixture.
In summary, the cement paste system suitable for cement plugging in the high-inclination section and the horizontal section and the preparation method thereof have the following beneficial effects:
1. the spherical water-absorbing gel plays a role in controlling water and preventing shrinkage in cement paste, and the total amount of the water in the cement paste and the water contained in the spherical water-absorbing gel can enable the water cement ratio to reach more than 0.48, so that the chemical shrinkage of the volume of the cement stone can be effectively prevented;
2. the water is controlled through the water-absorbing gel, so that unstable slurry results such as water separation, sedimentation and the like are prevented, and the spherical water-absorbing gel can obviously reduce the viscosity of cement slurry and improve the fluidity of the cement slurry due to a ball effect;
3. the spherical water-absorbing gel can also act as a thixotropic agent, and meanwhile, the combination of the fly ash (sinking beads) and the micro-silicon ensures that the cement paste has better thixotropic property, and prevents cement paste from scattering and casting along the lower well wall in the process of waiting for solidification;
4. the density of the cement paste system is from 1.70 g/cm to 1.90g/cm 3 The plug injection construction can be realized under the condition of 150 ℃ by adjusting the additive (the fluid loss agent and the retarder);
5. the preparation method has simple steps and convenient implementation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a graph showing the volume change of set cement when different spherical absorbent gels are added according to the embodiment of the invention;
FIG. 2 is a slurry casting dispersion diagram mentioned in the background art;
FIG. 3 is a graph showing cement paste thickening at 100℃according to an embodiment of the present invention;
FIG. 4 is a graph showing cement paste thickening at 110℃according to an embodiment of the present invention;
FIG. 5 is a graph showing cement paste thickening at 120℃according to an embodiment of the present invention;
FIG. 6 is a graph showing cement paste thickening at 150℃according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention, as provided, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1A Cement paste System suitable for high-inclination section and horizontal section cementing
Dry-mixing a gelling system consisting of 100 parts of D-grade oil well cement, 25 parts of fly ash (heavy beads) and 5 parts of microsilica with 2.5 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent to obtain a solid mixture; adding 10 parts of spherical water-absorbing gel, 1.5 parts of sulfonic acid group and carboxylic acid group copolymerization retarder into 40 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C1.
Example 2A Cement paste System suitable for high-inclination section and horizontal section cementing
Dry-mixing a gelling system consisting of 100 parts of D-grade oil well cement, 30 parts of fly ash (heavy beads) and 8 parts of micro-silicon with 2 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent to obtain a solid mixture; 15 parts of spherical water-absorbing gel and 1.5 parts of modified starch retarder are added into 41 parts of water to be mixed, so as to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C2.
Example 3A Cement paste System suitable for high-slope section and horizontal section cementing plugs
Dry-mixing a gelling system consisting of 100 parts of D-grade oil well cement, 30 parts of fly ash (heavy beads) and 8 parts of micro-silicon with 2 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent to obtain a solid mixture; adding 20 parts of spherical water-absorbing gel, 2 parts of sulfonic acid group and carboxylic acid group copolymerization retarder into 42.4 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C3.
Example 4A Cement paste System suitable for high-slope section and horizontal section cementing plugs
Dry-mixing a gelling system consisting of 100 parts of D-grade oil well cement, 30 parts of fly ash (heavy beads) and 8 parts of micro-silicon with 2.5 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent to obtain a solid mixture; adding 25 parts of spherical water-absorbing gel, 2 parts of sulfonic acid group and carboxylic acid group copolymerization retarder into 46.5 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C4.
Example 5 comparative sample (without addition of spherical absorbent gel)
Dry-mixing a gelling system consisting of 100 parts of D-grade oil well cement, 30 parts of fly ash (heavy beads) and 8 parts of micro-silicon with 2.5 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent to obtain a solid mixture; adding 1.5 parts of a sulfonic acid group and carboxylic acid group copolymerization retarder into 50 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C5.
Example 6 comparative sample (no spherical absorbent gel added, dispersant added)
Dry-mixing a cementing system consisting of 100 parts of D-grade oil well cement, 30 parts of fly ash (settling beads) and 8 parts of micro-silicon, 2.5 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent and 0.5 part of a sulfonated aldehyde ketone type dispersing agent to obtain a solid mixture; adding 1.5 parts of a sulfonic acid group and carboxylic acid group copolymerization retarder into 50 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C6.
Example 7 comparative sample (without addition of spherical absorbent gel, fly ash (sink beads) and micro silica)
Carrying out dry mixing on 138 parts of D-grade oil well cement, 2.5 parts of a sulfonic acid group and carboxylic acid group copolymerization type fluid loss agent and 0.5 part of a sulfonated aldehyde ketone type dispersing agent to obtain a solid mixture; adding 1.5 parts of a sulfonic acid group and carboxylic acid group copolymerization retarder into 50 parts of water for mixing to obtain a liquid mixture; and (3) stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system marked as C7.
Performance test:
1. testing of cement stone volume changes
The cement slurry systems of examples 1 to 7 were measured for volume change of set cement according to ANSI/API Recommended Practice 10B-5 standard, please refer to FIG. 1, and the specific results are as follows:
after the spherical water-absorbing gel is added according to the proportion of 10%, 15%, 20% and 25% of the cement mass, the volume of the cement stone is not shrunk.
2. Cement paste density, water separation, sedimentation stability, thixotropic property and fluidity test
Cement paste fluidity was measured according to ANSI/API Recommended Practice 10B-5 standard, sedimentation stability was characterized by the difference in upper and lower densities of cement paste systems, and thixotropic properties were characterized by the difference between final cut and initial cut.
Table 1: cement slurry density, water separation, sedimentation stability, thixotropic property and fluidity test results
| Cement paste sample | Density g/cm 3 | Water separating ml | Sedimentation stability g/cm 3 | Thixotropic properties | Flow cm |
| C1 | 1.90 | 0 | 0.03 | 25 | 24 |
| C2 | 1.85 | 0 | 0.01 | 26 | 24 |
| C3 | 1.80 | 0 | 0.006 | 23 | 23 |
| C4 | 1.75 | 0 | 0.005 | 24 | 23 |
| C5 | 1.90 | 1 | 0.07 | 25 | 18 |
| C6 | 1.90 | 2 | 0.1 | 20 | 22 |
| C7 | 1.90 | 0.5 | 0.05 | 2 | 20 |
From the test results in Table 1, it can be seen that cement paste has excellent water absorption and sedimentation stability after the cement paste systems C1-C4 are added with spherical water absorption gel; the spherical water-absorbing gel is not added in the cement slurry system C5, and compared with cement slurry systems C1-C4 added with the spherical water-absorbing gel, the spherical water-absorbing gel obviously improves the fluidity of cement slurry, and the fluidity of a cement slurry system C6 added with a dispersing agent is also improved; after the dispersing agent is added, the fluidity of the cement paste can meet the requirement, but the sedimentation stability and the water separation performance of the cement paste are destroyed. Compared with a cement paste system C5 without adding spherical water-absorbing gel, the thixotropic property of the cement paste system C7 is obviously reduced without adding the combination of the fly ash (sinking beads) and the micro-silicon, and the thixotropic property of the cement paste can be obviously improved by the combination of the fly ash (sinking beads) and the micro-silicon.
3. Testing cement paste viscosity
Table 2: six-rotation speed viscometer test result of cement paste
From the test results in Table 2, it can be seen that the 600-turn reading is lower, indicating that the cement paste viscosity is low.
4. Cement paste thickening time test
The cement paste thickening times of the cement paste systems of examples 1 to 7 were measured at 100 ℃ (example 2), 110 ℃ (example 2), 120 ℃ (example 1) and 150 ℃ (example 4), respectively, please refer to fig. 3 to 6 together, and the specific results are as follows:
the cement slurry system meets the requirement of the plug injection construction time under the condition of 150 ℃.
5. Cement stone compressive strength test
Table 3: cement stone compressive strength test result
From the test results in Table 3, it can be seen that the cement paste system suitable for cementing plugs in the high-inclination section and the horizontal section has compressive strength of cement stones greater than 14MPa after curing for 24 hours under different conditions.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (10)
1. A cement paste system suitable for cement plugs of high-inclination sections and horizontal sections is characterized in that: comprises a gel system, a fluid loss agent, a retarder, spherical absorbent gel and water;
the total amount of the water in the cement slurry system and the water in the spherical water-absorbing gel can lead the water-cement ratio to be more than 0.48.
2. The cement paste system suitable for plugging cement on high-inclination sections and horizontal sections according to claim 1, wherein,
the gel system consists of the following components in parts by weight: 100 parts of oil well cement, 25-30 parts of fly ash (sinking beads) and 5-10 parts of micro silicon;
preferably, the oil well cement is class D oil well cement.
3. The cement paste system suitable for plugging cement on high-inclination sections and horizontal sections according to claim 1, wherein,
the hydrogel water content of the spherical absorbent gel is 22+/-5 g/g. The sphere diameter of the hydrogel is 50-250 mu m.
4. A cement paste system suitable for plugging high-inclination sections and horizontal sections according to claim 2, wherein,
the dosage of the spherical water-absorbing gel is 10-25% of the mass of the cement.
5. The cement paste system suitable for plugging cement on high-inclination sections and horizontal sections according to claim 1, wherein,
the fluid loss agent is a fluid loss agent prepared by copolymerization of 1.5-5.0 parts of sulfonic acid groups and carboxylic acid groups.
6. The cement paste system suitable for plugging cement on high-inclination sections and horizontal sections according to claim 1, wherein,
the retarder is 0.5-5.0 parts of modified starch type retarder or retarder formed by copolymerization of sulfonic acid groups and carboxylic acid groups.
7. The cement paste system suitable for plugging cement with high-inclination sections and horizontal sections according to claim 6, wherein,
adopting a modified starch retarder at 90-120 ℃;
and (3) adopting a sulfonic acid group and carboxylic acid group copolymerization retarder at 120-150 ℃.
8. A cement paste system suitable for plugging high-inclination sections and horizontal sections according to claim 2, wherein,
the cement also comprises a sulfonated aldehyde ketone type dispersing agent, wherein the dosage of the dispersing agent is 0.25-2.0% of the mass of the cement.
9. A method of preparing a cement slurry system suitable for cementing plugs in high slope sections and horizontal sections as claimed in any one of claims 2 to 8, comprising the steps of:
dry-mixing the fluid loss agent and the gelling system to obtain a solid mixture;
adding the spherical water-absorbing gel and the retarder into water for mixing to obtain a liquid mixture;
and stirring and mixing the solid mixture and the liquid mixture to obtain a cement slurry system.
10. The method for preparing the cement paste system suitable for the cement plugs of the high-inclination sections and the horizontal sections according to claim 9, wherein the method comprises the following steps of,
the dispersant is also added when preparing the solid mixture.
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| CN102531481A (en) * | 2011-12-30 | 2012-07-04 | 中国石油集团川庆钻探工程有限公司 | High-strength low-density cement paste adopting fluid loss agent |
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| CN111100616A (en) * | 2020-01-03 | 2020-05-05 | 中国石油化工股份有限公司 | Cement slurry system for casing well cementation |
| CN111807747A (en) * | 2020-07-27 | 2020-10-23 | 中国石油大学(华东) | Cement water replenishing shrinkage-proof agent and preparation method and application thereof |
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| CN102531481A (en) * | 2011-12-30 | 2012-07-04 | 中国石油集团川庆钻探工程有限公司 | High-strength low-density cement paste adopting fluid loss agent |
| CN104909647A (en) * | 2015-05-21 | 2015-09-16 | 桂林理工大学 | Preparation method of early-age high-moisture concrete |
| WO2017015185A1 (en) * | 2015-07-17 | 2017-01-26 | Schlumberger Technology Corporation | High temperature and high pressure cement retarder composition and use thereof |
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