CN110386777B - Tough cement slurry and preparation method and application thereof - Google Patents
Tough cement slurry and preparation method and application thereof Download PDFInfo
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- CN110386777B CN110386777B CN201810345232.9A CN201810345232A CN110386777B CN 110386777 B CN110386777 B CN 110386777B CN 201810345232 A CN201810345232 A CN 201810345232A CN 110386777 B CN110386777 B CN 110386777B
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- 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
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- C—CHEMISTRY; METALLURGY
- 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
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- 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
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- 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
Abstract
The invention discloses a tough cement slurry, and a preparation method and application thereof. Wherein the tough cement paste comprises the following components in parts by mass: 100 parts of oil well cement; 33-40 parts of a strength stabilizer; 0.3-0.5 part of a dispersing agent; 0.3-0.5 part of a suspending agent; 0.2-3 parts of a coagulation regulator; 2-5 parts of a fluid loss agent; 0.1-0.3 part of defoaming agent; 30-60 parts of water; 1-3 parts of thermosetting phenolic resin; the strength stabilizer comprises micro silicon powder and quartz sand, wherein the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33); the thermosetting phenolic resin is an A-stage liquid phenolic resin with the molecular weight of 300-1000 or a B-stage partially cured phenolic resin with the molecular weight of 2000-5000. The set cement formed after the cement slurry is thickened has high strength, low elastic modulus and low permeability, can meet the requirements of well cementation construction of gas storage wells and gas injection and flooding oil production wells on the performance of the cement slurry, and ensures the safety of the well cementation construction.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production engineering, in particular to tough cement slurry and a preparation method and application thereof.
Background
In the drilling process of the oil and gas well, cement slurry is required to be utilized for well cementation so as to support, hang and protect the well wall, block fluid on the bottom layer, prevent interlayer channeling and casing corrosion, and play roles in blocking oil, gas and water, supporting the casing and protecting the casing and prolonging the service life of the oil and gas well. For well cementation in the aspects of gas storage construction, recovery rate improvement by gas injection flooding and the like, the set cement needs to bear alternating load, higher requirements are put on the sealing integrity of a shaft, and the set cement is required to have higher compressive strength (1.88 g/cm)3The compressive strength is 40MPa to 50MPa) to resist the damage of the external force, and also has stronger toughness to resist the elastic deformation.
In the related art, the toughness and deformation resistance of the set cement are generally improved by incorporating materials such as elastic materials, latex or fibers into the cement slurry.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the related art:
the related art provides a method of improving the toughness of the set cement by incorporating an elastic material, latex, or fiber, etc., but the compressive strength of the set cement is reduced.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present invention provide a tough cement slurry, and a preparation method and an application thereof, where the tough cement slurry has good toughness and good compression resistance.
Specifically, the method comprises the following technical scheme:
in a first aspect, an embodiment of the present invention provides a tough cement slurry, where the cement slurry includes the following components in parts by mass:
100 parts of oil well cement;
33-40 parts of strength stabilizer;
0.3-0.5 part of dispersing agent;
0.3-0.5 part of suspending agent;
0.2-3 parts of a coagulation regulator;
2-5 parts of a fluid loss agent;
0.1-0.3 part of defoaming agent;
30-60 parts of water;
1-3 parts of thermosetting phenolic resin;
the strength stabilizer comprises micro silicon powder and quartz sand, and the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33);
the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000.
Optionally, the dispersant is a sulfonated acetone formaldehyde condensate.
Optionally, the suspending agent is selected from at least one of bentonite, fiber derivatives and acrylamide and acrylate multipolymers.
Optionally, the set retarder is a retarder or a set accelerator; the mass parts of the retarder and the coagulant are respectively 0.2-0.5 and 1-3;
the retarder is a polymer with acrylamide as a main chain or organic phosphate; the coagulant is a composite salt coagulant.
Optionally, the fluid loss agent is polyvinyl alcohol and/or poly 2-acrylamido-2-methylpropanesulfonic acid.
Optionally, the defoamer is at least one of a silicone defoamer, a polyether defoamer, and a polyether modified polysiloxane defoamer.
Optionally, the oil well cement is grade G oil well cement and the water is fresh water.
In a second aspect, an embodiment of the present invention provides a method for preparing a tough cement slurry, including the following steps:
step a, uniformly mixing 100 parts by mass of oil well cement, 33-40 parts by mass of strength stabilizer, 0.3-0.5 part by mass of dispersant, 0.3-0.5 part by mass of suspending agent and 1-3 parts by mass of thermosetting phenolic resin to obtain a first mixture;
step b, uniformly mixing 2-5 parts by mass of a fluid loss agent, 0.2-3 parts by mass of a coagulation regulator, 0.1-0.3 part by mass of a defoaming agent and 30-60 parts by mass of water to obtain a second mixture;
step c, uniformly mixing the first mixture and the second mixture to obtain the tough cement slurry;
the strength stabilizer comprises micro silicon powder and quartz sand, and the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33);
the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000.
In a third aspect, the embodiment of the invention provides an application of the above tough cement slurry in well cementation.
Specifically, when the temperature of the reservoir is 40-80 ℃, the thermosetting phenolic resin adopts A-stage liquid phenolic resin with the molecular weight of 300-1000;
when the temperature of the reservoir is 81-120 ℃, the thermosetting phenolic resin is B-stage partially cured phenolic resin with the molecular weight of 2000-5000.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
in the tough cement slurry provided by the embodiment of the invention, the thermosetting phenolic resin forms a film in the hardened cement slurry, so that the binding force among hydration products is increased, the size of a microcrack is reduced, and the thermosetting phenolic resin becomes a barrier layer for ion permeation and diffusion, so that the mechanical property is obviously improved.
Meanwhile, the thermosetting phenolic resin cured product and the cement hydrated product are mutually crosslinked to form a compact interpenetrating network structure, so that the micro cracks and defects of the cement paste hardened body are overcome, the stress concentration of the set cement is dispersed, the deformation capability is improved, the brittleness of the set cement is reduced, and the toughness of the set cement is improved. The elastic modulus of the set cement formed by curing the tough cement slurry provided by the embodiment of the invention is 5-9 GPa, and is reduced by 20% -50% compared with the conventional slurry.
Moreover, the thermosetting phenolic resin has a relatively obvious coagulation accelerating effect, can improve the early compressive strength and reduce holes in the set cement, thereby reducing the permeability of the set cement, wherein the 48h compressive strength exceeds 40MPa, can reach 57MPa at most, and is increased by 20-60% compared with the conventional slurry.
In addition, the thermosetting phenolic resin and the silicon powder can both play a role in preventing the strength of the set cement from declining, and the thermosetting phenolic resin and the silicon powder are matched for use, so that the effect of preventing the high-temperature decline of the set cement is achieved, meanwhile, the gas channeling can be prevented, and the interface cementation strength is improved.
The cement slurry provided by the embodiment of the invention is applied to well cementation operations such as well cementation of a gas storage well, gas injection and flooding oil production well and the like, can effectively improve the well cementation quality, and provides technical support for long-term, safe and effective operation of an oil-gas well.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a thickening profile of the cement slurry prepared in example 1 at 60 ℃ for a thickening experiment;
FIG. 2 is a thickening plot of the cement slurry prepared in example 2 at 110 ℃ for a thickening experiment;
FIG. 3 is a thickening profile of the cement slurry prepared in example 3 at 110 ℃ for a thickening experiment.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In a first aspect, an embodiment of the present invention provides a tough cement slurry, which includes the following components in parts by mass:
100 parts of oil well cement;
33-40 parts of strength stabilizer;
0.3-0.5 part of dispersing agent;
0.3-0.5 part of suspending agent;
0.2-3 parts of a coagulation regulator;
2-5 parts of a fluid loss agent;
0.1-0.3 part of defoaming agent;
30-60 parts of water;
1-3 parts of thermosetting phenolic resin.
Wherein the strength stabilizer comprises micro silicon powder and quartz sand, and the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33);
the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000.
According to the tough cement slurry provided by the embodiment of the invention, through mutual matching and synergistic effect of the components, the set cement formed after the tough cement slurry is cured has good toughness and good pressure resistance.
Specifically, the thermosetting phenolic resin forms a film in the hardened cement slurry, increases the binding force between hydration products, reduces the size of microcracks, and becomes a barrier layer for ion permeation and diffusion, thereby obviously improving the mechanical property.
Meanwhile, the thermosetting phenolic resin cured product and the cement hydrated product are mutually crosslinked to form a compact interpenetrating network structure, so that the micro cracks and defects of the cement paste hardened body are overcome, the stress concentration of the set cement is dispersed, the deformation capability is improved, the brittleness of the set cement is reduced, and the toughness of the set cement is improved. The elastic modulus of the set cement formed by curing the tough cement slurry provided by the embodiment of the invention is 5-9 GPa, and is reduced by 20% -50% compared with the conventional slurry.
Moreover, the thermosetting phenolic resin has a relatively obvious coagulation accelerating effect, can improve the early compressive strength and reduce holes in the set cement, thereby reducing the permeability of the set cement, wherein the 48h compressive strength exceeds 40MPa, can reach 57MPa at most, and is increased by 20-60% compared with the conventional slurry.
The thermosetting phenolic resin and the silica fume can both have the effect of preventing the strength of the set cement from declining, and the thermosetting phenolic resin and the silica fume are matched for use, so that the effect of preventing the high-temperature decline of the set cement is achieved, meanwhile, the gas channeling can be prevented, and the interface cementation strength is improved.
In addition, in the tough cement slurry provided by the embodiment of the invention, the compressive strength of the set cement can be effectively improved by the strength stabilizer compounded by the silica fume and the quartz sand. The dispersant can reduce the viscosity of cement paste and increase the flow performance. The suspending agent can keep good dynamic stability, coalescence stability and flocculation stability of the cement paste. The setting regulator is used for regulating the cement paste thickening time, and specifically can be a retarder or a coagulant, wherein the retarder can prolong the cement paste thickening time, and the coagulant can shorten the cement paste thickening time and obviously improve the early compressive strength of set cement.
In conclusion, the cement slurry provided by the embodiment of the invention has the characteristics of low water loss, good stability, short static gel transition time, strong gas channeling prevention capability and the like, and the set cement formed after the cement slurry is solidified has good compactness, low permeability, high strength and low elastic modulus, can be well applied to well cementation operations such as well cementation of a gas storage well, gas injection and flooding oil production well and the like, can effectively improve the well cementation quality, and provides technical support for long-term, safe and effective operation of an oil-gas well.
In the embodiment of the invention, the type of the thermosetting phenolic resin is selected according to the requirement of the use temperature. Wherein, when the temperature of the use environment is 40-80 ℃, the thermosetting phenolic resin adopts a phenol formaldehyde pre-polymerization condensate (A-stage liquid phenolic resin) with the molecular weight of 300-1000; when the temperature of the use environment is 81-120 ℃, the thermosetting phenolic resin adopts partially cured phenolic resin (B-stage phenolic resin, solid powder and slight crosslinking) with the molecular weight of 2000-5000.
In the embodiment of the invention, the mass parts of the components can be arbitrarily selected within a limited range. For example, the strength stabilizer may be present in 33, 34, 35, 36, 37, 38, 39, 40 parts, etc. by weight; in the strength stabilizer, the proportion of the silica fume may be 3, 4, 5, 6, 7, etc., and the proportion of the quartz sand may be 30, 31, 32, 33, etc.
The dispersant may be present in an amount of 0.3 parts, 0.32 parts, 0.34 parts, 0.35 parts, 0.36 parts, 0.38 parts, 0.4 parts, 0.42 parts, 0.44 parts, 0.45 parts, 0.46 parts, 0.48 parts, 0.5 parts, etc.
The suspending agent may be 0.3 part, 0.32 part, 0.34 part, 0.35 part, 0.36 part, 0.38 part, 0.4 part, 0.42 part, 0.44 part, 0.45 part, 0.46 part, 0.48 part, 0.5 part, etc. by mass.
The mass portion of the fluid loss agent can be 2 portions, 2.2 portions, 2.4 portions, 2.5 portions, 2.6 portions, 2.8 portions, 3 portions, 3.2 portions, 3.4 portions, 3.5 portions, 3.6 portions, 3.8 portions, 4 portions, 4.2 portions, 4.4 portions, 4.6 portions, 4.8 portions, 5 portions and the like.
The defoaming agent may be 0.1 part, 0.12 part, 0.14 part, 0.15 part, 0.16 part, 0.18 part, 0.2 part, 0.22 part, 0.24 part, 0.25 part, 0.26 part, 0.28 part, 0.3 part, etc. by mass.
The water may be present in an amount of 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 55 parts, 56 parts, 58 parts, 60 parts, etc.
The thermosetting phenolic resin can be 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts and the like by mass.
The mass parts of the retarder can be 0.2 part, 0.22 part, 0.24 part, 0.25 part, 0.26 part, 0.28 part, 0.3 part, 0.32 part, 0.34 part, 0.35 part, 0.36 part, 0.38 part, 0.4 part, 0.42 part, 0.44 part, 0.45 part, 0.46 part, 0.48 part, 0.5 part and the like; the mass portion of the coagulant may be 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts and the like.
In the present embodiment, the dispersant may be a dispersant commonly used in the art, such as a sulfonated acetone formaldehyde condensate.
The suspending agent may be at least one of bentonite, a fiber derivative and a copolymer of acrylamide and acrylate.
The retarder can be a polymer with acrylamide as a main chain or organic phosphate; the setting accelerator may be a compound salt type setting accelerator.
The fluid loss agent can be polyvinyl alcohol and/or poly 2-acrylamide-2-methylpropanesulfonic acid.
The defoaming agent may be at least one of a silicone defoaming agent, a polyether defoaming agent, and a polyether-modified polysiloxane defoaming agent.
The oil well cement can be grade G oil well cement, and the water can be fresh water.
In a second aspect, an embodiment of the present invention provides a method for preparing a tough cement slurry, which is used for preparing the tough cement slurry, and specifically includes the following steps:
step S1, uniformly mixing 100 parts by mass of oil well cement, 33-40 parts by mass of strength stabilizer, 0.3-0.5 part by mass of dispersant, 0.3-0.5 part by mass of suspending agent and 1-3 parts by mass of thermosetting phenolic resin to obtain a first mixture;
step S2, uniformly mixing 2-5 parts by mass of a fluid loss agent, 0.2-3 parts by mass of a coagulation regulator, 0.1-0.3 part by mass of a defoaming agent and 30-60 parts by mass of water to obtain a second mixture;
step S3, uniformly mixing the first mixture and the second mixture to obtain tough cement slurry;
the strength stabilizer comprises micro silicon powder and quartz sand, wherein the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33).
Wherein the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000.
In the preparation method provided by the embodiment of the invention, in step S3, the first mixture and the second mixture are mixed according to the specification of the GB/T19139-2003 'oil well cement test method', and slurry is prepared.
In a third aspect, the embodiment of the invention provides an application of the above tough cement slurry in well cementation.
As mentioned above, when the temperature of the reservoir is 40-80 ℃, the thermosetting phenolic resin adopts A-stage liquid phenolic resin with the molecular weight of 300-1000. When the temperature of the reservoir is 81-120 ℃, B-stage partially cured phenolic resin with the molecular weight of 2000-5000 is adopted as the thermosetting phenolic resin.
The technical solution of the embodiments of the present invention is further described in detail by specific data.
In the following examples, the A-stage liquid phenolic resin is a phenol formaldehyde pre-polymerization condensate with the molecular weight of 300-1000, model YJDJ, produced by Petroleum Tiancheng of North China from Hebei by the group of industries, Inc.;
the molecular weight of the B-stage partially cured phenolic resin is 2000-5000, the type is 1000, the B-stage partially cured phenolic resin is produced by a Lingshou mineral processing plant in Lingshou county, is solid powder and is lightly crosslinked;
the dispersant is an aldehyde ketone polycondensate, the model is DRS-100S, and is produced by China Petroleum group drilling engineering technical research institute;
the suspending agent is acrylamide and acrylate multipolymer, the model is DRY-S2, and is produced by China Petroleum group drilling engineering technical research institute;
the coagulant is a compound of organic matters and inorganic matters, and is produced by engineering science and technology Limited of oil Bohai star in Tianjin, model CA 903S;
the retarder is organic phosphate, and is produced by China Petroleum group drilling engineering technical research institute with the model number DRH-100L;
the fluid loss agent is a multipolymer with the model number of DRF-100L and is produced by the institute of drilling engineering and technology of the petroleum group in China;
the defoaming agent is polyether defoaming agent with the model of DRX-1L and is produced by China Petroleum group drilling engineering technical research institute.
Example 1
The embodiment provides a tough cement slurry. The tough cement paste comprises the following components in parts by mass:
100 parts of G-grade oil well cement;
33 parts of strength stabilizer, wherein the mass ratio of the micro silicon powder to the quartz sand is as follows: 3: 30;
0.5 part of aldehyde ketone polycondensate serving as a dispersing agent;
0.5 part of a suspending agent which is acrylamide and acrylate multipolymer;
the coagulant is a compound of organic matters and inorganic matters, 3 parts;
5 parts of a fluid loss agent which is a multipolymer;
0.2 part of defoaming agent which is polyether;
1 part of A-stage liquid phenolic resin with the molecular weight of 300-1000;
water, 52 parts.
The preparation method of the tough cement slurry comprises the following steps: dry-mixing oil well cement, a strength stabilizer, a dispersant, a suspending agent and A-stage liquid phenolic resin until the mixture is uniform to obtain a first mixture; wetting and mixing the fluid loss agent, the coagulant, the defoaming agent and water to be uniform to obtain a second mixture; the first mixture and the second mixture are mixed according to the oil well cement test method of the standard GB/T19139-2003 to prepare the tough cement paste of the embodiment.
Example 2
The embodiment provides a tough cement slurry. The tough cement paste comprises the following components in parts by mass:
100 parts of G-grade oil well cement;
33 parts of strength stabilizer, wherein the mass ratio of the micro silicon powder to the quartz sand is as follows: 3: 30;
0.5 part of aldehyde ketone polycondensate serving as a dispersing agent;
0.5 part of a suspending agent which is acrylamide and acrylate multipolymer;
0.5 part of retarder which is organic phosphate;
5 parts of a fluid loss agent which is a multipolymer;
0.2 part of defoaming agent which is polyether;
2 parts of B-stage partially cured phenolic resin with the molecular weight of 2000-5000;
water, 52 parts.
The preparation method of the tough cement slurry comprises the following steps: dry-mixing oil well cement, a strength stabilizer, a dispersant, a suspending agent and a B-stage partially cured phenolic resin until the mixture is uniform to obtain a first mixture; mixing the fluid loss agent, the retarder, the defoaming agent and water uniformly to obtain a second mixture; the first mixture and the second mixture are mixed according to the oil well cement test method of the standard GB/T19139-2003 to prepare the tough cement paste of the embodiment.
Example 3
The embodiment provides a tough cement slurry. The tough cement paste comprises the following components in parts by mass:
100 parts of G-grade oil well cement;
35 parts of strength stabilizer, wherein the mass ratio of the micro silicon powder to the quartz sand is as follows: 5: 30;
0.5 part of aldehyde ketone polycondensate serving as a dispersing agent;
0.5 part of a suspending agent which is acrylamide and acrylate multipolymer;
0.5 part of retarder which is organic phosphate;
3 parts of a fluid loss agent which is a multipolymer;
0.2 part of defoaming agent which is polyether;
3 parts of B-stage partially cured phenolic resin with the molecular weight of 2000-5000;
water, 52 parts.
The preparation method of the tough cement slurry comprises the following steps: dry-mixing oil well cement, a strength stabilizer, a dispersant, a suspending agent and a B-stage partially cured phenolic resin until the mixture is uniform to obtain a first mixture; mixing the fluid loss agent, the retarder, the defoaming agent and water uniformly to obtain a second mixture; the first mixture and the second mixture are mixed according to the oil well cement test method of the standard GB/T19139-2003 to prepare the tough cement paste of the embodiment.
Example 4
In this example, the properties of the tough grouts provided in examples 1 to 3 and the properties of the set cement formed after thickening the grouts were tested.
The specific test conditions were as follows:
the curing conditions of the rheological property of the tough cement slurry provided in the embodiment 1 are 60 ℃ multiplied by 20min, the thickening test conditions are 60 ℃ multiplied by 35MPa multiplied by 45min, and the curing conditions of the triaxial mechanical test block are 60 ℃ multiplied by 21MPa multiplied by 48 h.
The curing conditions of the rheological property of the tough cement slurry provided in the embodiments 2 to 3 are 93 ℃ multiplied by 20min, the thickening test conditions are 110 ℃ multiplied by 35MPa multiplied by 45min, and the curing conditions of the triaxial mechanical test block are 110 ℃ multiplied by 21MPa multiplied by 48 h.
The measurement of the basic performance permeability is carried out according to the GB/T19139 oil well cement test method, the triaxial test being carried out according to the American Society for Testing and Materials (ASTM) test standard, ASTM D2664-04 (triaxial test); the permeability is carried out according to the SY-T5336-2006 rock analysis method.
The results of the cement paste and set cement related performance tests are shown in tables 1 and 2, respectively.
TABLE 1 basic Properties of the Cement slurries
TABLE 2 basic Cement Properties
| Serial number | Compressive strength (MPa) | Modulus of elasticity (GPa) | Permeability (md) |
| 1 | 42.9 | 8.670 | <0.01 |
| 2 | 52 | 5.247 | <0.01 |
| 3 | 57.52 | 5.778 | <0.01 |
As can be seen from Table 1, the thickening time of the cement paste prepared in each embodiment is adjustable within 117-276 min, the cement paste is thickened at right angles, the transition time is short, the SPN value is less than 3, the gas channeling resistance is good, the water loss is low and is less than 50 mL; the basic performance of the cement paste is better.
As can be seen from Table 2, the set cement formed by thickening the cement slurry provided by the embodiments has the characteristics of high strength, low elastic modulus and low permeability, the compressive strength of 48h exceeds 40MPa, the highest compressive strength can reach 57MPa, the elastic modulus is only 5-9 GPa, and the permeability is less than 0.01md, so that the requirements of well cementation construction of a gas storage well and a gas injection and flooding oil well on the performance of the cement slurry can be met, and the safety of the well cementation construction is ensured.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The tough cement slurry is applied to well cementation and is characterized by comprising the following components in parts by mass:
100 parts of oil well cement;
33-40 parts of strength stabilizer;
0.3-0.5 part of dispersing agent;
0.3-0.5 part of suspending agent;
0.2-3 parts of a coagulation regulator;
2-5 parts of a fluid loss agent;
0.1-0.3 part of defoaming agent;
30-60 parts of water;
1-3 parts of thermosetting phenolic resin;
the strength stabilizer comprises micro silicon powder and quartz sand, and the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33);
the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000, wherein the use environment temperature of the A-stage liquid phenolic resin is 40-80 ℃, and the use environment temperature of the B-stage partially cured phenolic resin is 81-120 ℃;
wherein the tough cement slurry is obtained by the following steps:
step a, uniformly mixing the oil well cement, the strength stabilizer, the dispersing agent, the suspending agent and the thermosetting phenolic resin to obtain a first mixture;
step b, uniformly mixing the fluid loss agent, the coagulation regulator, the defoaming agent and the water to obtain a second mixture;
and c, uniformly mixing the first mixture and the second mixture to obtain the tough cement slurry.
2. A cement slurry according to claim 1, characterised in that the dispersant is a sulphonated acetone formaldehyde condensate.
3. A grout according to claim 1, wherein said suspending agent is selected from at least one of bentonite, fibre derivatives and acrylamide and acrylate multipolymers.
4. A cement slurry according to claim 1, wherein the set-adjusting agent is a retarder or a set-accelerating agent; the mass parts of the retarder and the coagulant are respectively 0.2-0.5 and 1-3;
the retarder is a polymer taking organic phosphate or acrylamide as a main chain; the coagulant is an additive compounded by organic matters and inorganic matters.
5. A cement slurry according to claim 1, wherein the fluid loss additive is polyvinyl alcohol and/or poly 2-acrylamido-2-methylpropanesulfonic acid.
6. The cement slurry of claim 1, wherein the defoamer is at least one of a silicone defoamer, a polyether defoamer, and a polyether modified silicone defoamer.
7. The cement slurry of claim 1, wherein the oil well cement is a grade G oil well cement and the water is fresh water.
8. The preparation method of the tough cement slurry is characterized by comprising the following steps:
step a, uniformly mixing 100 parts by mass of oil well cement, 33-40 parts by mass of strength stabilizer, 0.3-0.5 part by mass of dispersant, 0.3-0.5 part by mass of suspending agent and 1-3 parts by mass of thermosetting phenolic resin to obtain a first mixture;
step b, uniformly mixing 2-5 parts by mass of a fluid loss agent, 0.2-3 parts by mass of a coagulation regulator, 0.1-0.3 part by mass of a defoaming agent and 30-60 parts by mass of water to obtain a second mixture;
step c, uniformly mixing the first mixture and the second mixture to obtain the tough cement slurry;
the strength stabilizer comprises micro silicon powder and quartz sand, and the mass ratio of the micro silicon powder to the quartz sand is (3-7) to (30-33);
the thermosetting phenolic resin is A-stage liquid phenolic resin or B-stage partially cured phenolic resin; the molecular weight of the A-stage liquid phenolic resin is 300-1000; the molecular weight of the B-stage partially cured phenolic resin is 2000-5000.
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| CN110845705A (en) * | 2019-11-05 | 2020-02-28 | 长江大学 | Elastic modified resin for oil well cement and preparation method and application thereof |
| CN114426816B (en) * | 2020-09-21 | 2023-06-13 | 中国石油化工股份有限公司 | High-temperature-resistant well cementation spacer fluid and preparation method and application thereof |
| CN113716902B (en) * | 2021-08-19 | 2022-10-28 | 中国石油大学(华东) | Compact and tough gas channeling prevention cement slurry system suitable for low-temperature well cementation and composition thereof |
| CN115504713B (en) * | 2022-09-09 | 2023-06-16 | 长江大学 | Pre-cured resin-based high-cementing-toughness cement paste for shaft plugging and preparation method and application thereof |
| CN116947398B (en) * | 2023-09-14 | 2023-11-24 | 成都源盟石油科技有限公司 | Resin cement paste and preparation method thereof |
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