CN110845705A - Elastic modified resin for oil well cement and preparation method and application thereof - Google Patents
Elastic modified resin for oil well cement and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/281—Polyepoxides
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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
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/44—Amides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5026—Amines cycloaliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5033—Amines aromatic
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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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/50—Flexible or elastic materials
- C04B2111/503—Elastic materials
Abstract
The invention discloses an elastic modified resin for oil well cement, which comprises the following raw material components in parts by weight: 100 parts of epoxy resin base liquid and 10-25 parts of epoxy resin curing agent. The invention also discloses well cementation cement slurry which comprises the following raw material components in parts by weight: 100 parts of cement, 36-44 parts of fresh water, 3-6 parts of fluid loss additive, 0.1-0.6 part of dispersing agent, 1-4 parts of early strength agent, 2-5 parts of reinforcing agent, 0.2-0.6 part of retarder, 0.5-1.5 parts of defoaming agent and 20-50 parts of elastic modified resin. The invention uses the elastic modified resin as the functional material of the oil well cement, and the elastic modified resin is mixed with the oil well cement, thereby enhancing the anti-damage capability of the cement sheath, having good cement paste stability, no sedimentation phenomenon, good fluidity, adjustable thickening time and low water loss, and meeting the requirements of well cementation construction operation.
Description
Technical Field
The invention relates to the technical field of elastic modification of oil well cement, in particular to elastic modified resin for oil well cement.
Background
Along with the development of oil and gas fields, a well cementation cement sheath can bear the action of various loads such as internal pressure transmitted by a casing, formation rock confining pressure, temperature strain caused by well bore temperature change, high pressure impact of a gas well and the like in the process of drilling or production, the stress state of a well cementation cement sheath packing system can be changed due to the action, a cement sheath sealing system can be caused to fail in serious cases, interlayer channeling and casing damage occur, and even the oil and gas well is scrapped. Aiming at the failure risk of the action of cement and stone in a shaft, research shows that a high-elasticity and low-modulus cement paste system is the key for guaranteeing the well cementation quality and the long-term packing capability.
Epoxy resin is a polymeric material that undergoes a curing reaction with a corresponding curing agent to form an integral body. The patent (CN 108822815A) discloses a cementing pregel which mainly comprises an epoxy resin solution, a resin curing agent, a retarder, an expanding agent, an emulsifier and a weighting agent, and is mainly used in the early stage of cementing operation to prevent the problem of annulus pressure in the cementing. The patent (CN 107739598A) discloses a permanent epoxy resin cementing agent, which is formed by mixing liquid epoxy resin, glycerol ether reactive diluent and imidazole curing agent, wherein the viscosity of the cementing agent is lower than 600mPa & s, the compressive strength of a cured product at room temperature is more than 100MPa, and the retention rate of the compressive strength after 30 days in a sodium hydroxide solution with the concentration of 25% at 80 ℃ is more than 90%. The resin and the curing agent are mixed and then directly used for well cementation, and the problems of high cost, difficult control of thickening time and curing time, low gas channeling prevention capability and poor pollution resistance exist. The patent (CN 108865087A) discloses a thermosetting epoxy resin working solution, which mainly comprises epoxy resin, an aliphatic amine curing agent, a toughening agent, an ester diluent, a density regulator and water, has the characteristics of high tensile strength, high breaking strength and good toughness, and is used for repairing micro cracks of a cement sheath.
Epoxy resin containing a curing agent is commonly used for improving the mechanical property, the impermeability and the durability of cement slurry in the field of building materials, but the application environment of oil well cement is more complicated and is often accompanied with complicated conditions such as high temperature and high pressure, and the resin applied in the building materials cannot be directly used for well cementation. Patent (CN 108373297a) discloses a channeling-preventing well-cementing resin cement slurry system, which mainly comprises cement, water, resin, a resin curing agent and an additive, has the characteristics of low viscosity and good channeling-preventing property, and is mainly used for preventing channeling after well cementation.
In order to improve the long-term sealing integrity of well cementing operation, a cement slurry system with high elasticity and an elastic modified material need to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an elastic modified resin for oil well cement and elastic well cementing cement slurry. The elastic modified resin for oil well cement has high flexibility, strong elastic deformation capability, good compatibility after being mixed with the oil well cement, good dispersibility in water solution and stable performance after being cured; the elastic cement paste for well cementation prepared by using the elastic modified resin for oil well cement has the advantages of good stability, no sedimentation phenomenon, good rheological property, adjustable thickening time and small water loss, and the formed cement stone has strong elastic deformation capability and high cementing strength, thereby not only meeting the requirements of field well cementation construction, but also having high elasticity.
The invention is realized by the following steps:
one purpose of the invention is to provide an elastic modified resin, which comprises the following raw material components in parts by weight: 100 parts of epoxy resin base liquid and 10-25 parts of epoxy resin curing agent.
The epoxy resin base liquid is one or more of bisphenol A epoxy resin, peracetic acid epoxy resin, epichlorohydrin resin and epichlorohydrin resin.
The epoxy resin curing agent is one or more of aromatic amine curing agent, alicyclic amine curing agent, polyamide curing agent and organic acid anhydride curing agent.
The second purpose of the invention is to provide a preparation method of the elastic modified resin, which comprises the following steps:
step 1, weighing epoxy resin base liquid and epoxy resin curing agent according to the weight parts;
and 2, mixing the epoxy resin base liquid and the epoxy resin curing agent in parts by weight in the step 1, and uniformly stirring to obtain the elastic modified resin. And (3) taking the elastic modified resin prepared in the step (2) as a well cementation cement slurry additive to be used for preparing a well cementation cement slurry system.
The invention also aims to provide the well cementation cement slurry which comprises the following raw material components in parts by weight: 100 parts of cement, 36-44 parts of fresh water, 3-6 parts of fluid loss additive, 0.1-0.6 part of dispersing agent, 1-4 parts of early strength agent, 2-5 parts of reinforcing agent, 0.2-0.6 part of retarder, 0.5-1.5 parts of defoaming agent and 20-50 parts of elastic modified resin, wherein the elastic modified resin is prepared by the method.
The cement is G-grade high-sulfur-resistance oil well cement meeting API specifications.
The fluid loss agent is one or more of carboxymethyl cellulose, polyethyleneimine, polyacrylamide and a copolymer of 2-acrylamide-2-methylpropanesulfonic acid/acrylamide.
The dispersing agent is one or more of calcium lignosulphonate, polynaphthalene sulfonate, polymaleic anhydride and styrene-maleic anhydride sulfonated copolymer.
The early strength agent is one or a mixture of more of calcium chloride, sodium silicate, formamide and triethanolamine.
The reinforcing agent is one or more of micro silicon, superfine slag and silicon powder.
The retarder is one or more of sodium citrate, sodium tartrate, sulfonated tannin and boric acid.
The defoaming agent is one or more of glyceryl polyether, silicon ether oil, siloxane and tributyl phosphate.
The fourth purpose of the invention is to provide a method for preparing elastic well cementation cement slurry by using the elastic modified resin, which comprises the following steps:
step 1, dry-mixing the cement, the dispersing agent, the fluid loss agent, the early strength agent and the reinforcing agent in parts by weight to obtain mixed dry powder;
step 2, dissolving the retarder, the defoaming agent and the elastic modified resin in parts by weight in water, and uniformly stirring to obtain a mixed aqueous solution;
and 3, adding the mixed dry powder obtained in the step 1 into the mixed aqueous solution obtained in the step 2, and uniformly stirring to obtain the cement slurry for well cementation.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention takes the elastic modified resin as the external functional material for improving the elasticity of the oil well cement, and the elastic modified resin is mixed with the oil well cement for use, rather than taking the resin directly as the well cementing working fluid, so the cost is lower, and the safety of well cementing construction is higher.
2. The elastic modified resin provided by the invention has good compatibility with oil well cement, the cured resin body has extremely high flexibility and extremely strong deformation recovery capability, and after being doped into the oil well cement, the elastic modulus of the oil well cement can be greatly reduced, and the effect of improving the elasticity of cement stone is excellent;
3. the cement stone formed by the elastic modified resin cement paste system provided by the invention has the advantages of low elastic modulus, high elasticity, strong deformation capability, enhanced anti-damage capability of a cement sheath, good stability of the cement paste, no sedimentation phenomenon, good fluidity, adjustable thickening time and low water loss, and meets the requirements of well cementation construction operation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
1. Preparation of elasticity-modified resin for improving elasticity of oil well cement
Weighing 100 parts of epoxy resin base liquid by weight, weighing 10 parts of epoxy resin curing agent, adding the epoxy resin curing agent into the epoxy resin base liquid, and stirring uniformly at the rotating speed of 500 +/-30 r/min to obtain the elastic modified resin for improving the elasticity of the oil well cement.
2. Preparation of elastic well cementation cement slurry
Weighing 100 parts by weight of cement, 0.6 part by weight of dispersant, 4 parts by weight of early strength admixture, 3 parts by weight of fluid loss additive and 5 parts by weight of reinforcing agent, dry-mixing into dry powder, weighing 36 parts by weight of fresh water, weighing 50 parts by weight of elastic modified resin, 0.2 part by weight of retarder and 1.5 parts by weight of defoaming agent, and dissolving in water. And then pouring the aqueous solution into a stirring cup, stirring at the rotating speed of 4000 +/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15s, covering a cover of the stirring cup, and stirring for 35s +/-1 s to obtain the elastic cement slurry for well cementation, which is prepared by using the elastic modified resin.
Example 2
1. Preparation of elasticity-modified resin for improving elasticity of oil well cement
Weighing 100 parts of epoxy resin base liquid by weight, weighing 15 parts of epoxy resin curing agent, adding the epoxy resin curing agent into the epoxy resin base liquid, and stirring uniformly at the rotating speed of 500 +/-30 r/min to obtain the elastic modified resin for improving the elasticity of the oil well cement.
2. Preparation of elastic well cementation cement slurry
Weighing 100 parts by weight of cement, 0.45 part by weight of dispersant, 3.5 parts by weight of early strength admixture, 4 parts by weight of fluid loss additive and 4 parts by weight of reinforcing agent, dry-mixing into dry powder, weighing 38 parts by weight of fresh water, weighing 40 parts by weight of elastic modified resin, 0.3 part by weight of retarder and 1 part by weight of defoaming agent, and dissolving in water. And then pouring the aqueous solution into a stirring cup, stirring at the rotating speed of 4000 +/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15s, covering a cover of the stirring cup, and stirring for 35s +/-1 s to obtain the elastic cement slurry for well cementation, which is prepared by using the elastic modified resin.
Example 3
1. Preparation of elasticity-modified resin for improving elasticity of oil well cement
Weighing 100 parts of epoxy resin base liquid by weight, weighing 20 parts of epoxy resin curing agent, adding the epoxy resin curing agent into the epoxy resin base liquid, and stirring uniformly at the rotating speed of 500 +/-30 r/min to obtain the elastic modified resin for improving the elasticity of the oil well cement.
2. Preparation of elastic well cementation cement slurry
Weighing 100 parts by weight of cement, 0.35 part by weight of dispersant, 2.5 parts by weight of early strength admixture, 4 parts by weight of fluid loss additive and 3 parts by weight of reinforcing agent, dry-mixing into dry powder, weighing 40 parts by weight of fresh water, weighing 35 parts by weight of elastic modified resin, 0.4 part by weight of retarder and 1 part by weight of defoaming agent, and dissolving in water. And then pouring the aqueous solution into a stirring cup, stirring at the rotating speed of 4000 +/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15s, covering a cover of the stirring cup, and stirring for 35s +/-1 s to obtain the elastic cement slurry for well cementation, which is prepared by using the elastic modified resin.
Example 4
1. Preparation of elasticity-modified resin for improving elasticity of oil well cement
Weighing 100 parts of epoxy resin base liquid by weight, weighing 20 parts of epoxy resin curing agent, adding the epoxy resin curing agent into the epoxy resin base liquid, and stirring uniformly at the rotating speed of 500 +/-30 r/min to obtain the elastic modified resin for improving the elasticity of the oil well cement.
2. Preparation of elastic well cementation cement slurry
Weighing 100 parts by weight of cement, 0.25 part by weight of dispersant, 2 parts by weight of early strength admixture, 5 parts by weight of fluid loss additive and 3 parts by weight of reinforcing agent, dry-mixing into dry powder, weighing 42 parts by weight of fresh water, weighing 30 parts by weight of elastic modified resin, 0.5 part by weight of retarder and 0.8 part by weight of defoaming agent, and dissolving in water. And then pouring the aqueous solution into a stirring cup, stirring at the rotating speed of 4000 +/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15s, covering a cover of the stirring cup, and stirring for 35s +/-1 s to obtain the elastic cement slurry for well cementation, which is prepared by using the elastic modified resin.
Example 5
1. Preparation of elasticity-modified resin for improving elasticity of oil well cement
Weighing 100 parts of epoxy resin base liquid by weight, weighing 25 parts of epoxy resin curing agent, adding the epoxy resin curing agent into the epoxy resin base liquid, and stirring uniformly at the rotating speed of 500 +/-30 r/min to obtain the elastic modified resin for improving the elasticity of the oil well cement.
2. Preparation of elastic well cementation cement slurry
Weighing 100 parts by weight of cement, 0.1 part by weight of dispersant, 1 part by weight of early strength admixture, 6 parts by weight of fluid loss additive and 2 parts by weight of reinforcing agent, dry-mixing into dry powder, weighing 44 parts by weight of fresh water, weighing 20 parts by weight of elastic modified resin, 0.6 part by weight of retarder and 0.5 part by weight of defoaming agent, and dissolving in water. And then pouring the aqueous solution into a stirring cup, stirring at the rotating speed of 4000 +/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15s, covering a cover of the stirring cup, and stirring for 35s +/-1 s to obtain the elastic cement slurry for well cementation, which is prepared by using the elastic modified resin.
Comparative example 1
1. Preparing an elasticity-modified resin for improving the elasticity of oil well cement:
this comparative example contained no curative material, the remaining components and levels were consistent with example 4;
2. preparing elastic well cementing cement slurry:
the contents were the same as in example 4 except that the elastic modified resin contained no curing agent.
Comparative example 2
1. Preparing well cementation cement slurry:
the remaining components were in accordance with example 4 except that the epoxy resin and its curing agent were not contained, i.e., the elasticity-modifying resin was not contained.
For comparison, the components and weight ratios of examples 1 to 5 and comparative examples 1 and 2 are summarized in table 1 below.
TABLE 1
Experimental example 1 elasticity test of an elastically modified resin
After preparing the elastic modified resin for improving the elasticity of oil well cement according to the examples, the deformation recovery rate after compression of the cured elastic modified resin was tested. The results of the tests on the elasticity-modified resin for improving the elasticity of oil well cement prepared according to the present invention are shown in Table 2.
TABLE 2
Experimental example 2 Performance test of elastic well cementing slurry
After cement slurries are prepared according to the API specification, the performance tests are carried out on the cement slurries of examples 1 to 5 and the cement slurries of comparative example 1 and comparative example 2 according to the standard API 10B-2-2005 of well cementation tests, and the performance test results of the elastic well cementation cement slurries prepared by the elastic modified resin are shown in Table 3.
TABLE 3
As can be seen from Table 2, the elastic modified resin without the curing agent in the comparative example 1 is not cured, the deformation recovery rate of the cured elastic modified resin prepared by different examples with the curing agent can reach 100%, and the prepared elastic modified resin has high elasticity and is beneficial to improving the elasticity of oil well cement.
As can be seen from Table 3, compared with comparative example 1, the epoxy resin base fluid provided by the invention has better application effect after the curing agent is used, and the epoxy resin base fluid without the curing agent has great adverse effect on the cement slurry performance after being mixed into oil well cement. Compared with the comparative example 2, the elastic modified resin for oil well cement provided by the invention has good application effect in well cementation cement slurry, the elasticity modulus of a cement stone formed by the well cementation cement slurry using the elastic modified resin is reduced by 83.33% to the maximum extent, the reduction range of the elasticity modulus is large, the elasticity of the cement stone is greatly improved, free liquid does not exist in an epoxy resin cement slurry system, the density difference after standing is 0, the water loss is less than 50mL, the rheological property is good, and the thickening time and the compressive strength meet the requirements of well cementation construction.
In conclusion, the epoxy resin base fluid for oil well cement provided by the invention is mixed with a curing agent to form the elastic modified resin, the elasticity of the elastic modified resin is high after curing, a cement stone formed by cement paste prepared by using the elastic modified resin has low elastic modulus and high elasticity, the cement paste has better stability, low water loss, thickening controllability and good rheological property, and all properties meet the requirements of well cementation construction, thereby being beneficial to improving the long-term sealing quality of well cementation and prolonging the service life of oil and gas wells.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The elastic modified resin for oil well cement is characterized by comprising the following raw material components in parts by weight: 100 parts of epoxy resin base liquid and 10-25 parts of epoxy resin curing agent.
2. The elastic modified resin for oil well cement as claimed in claim 1, wherein the epoxy resin base fluid is one or more of bisphenol A epoxy resin, peracetic acid epoxy resin, epichlorohydrin resin and epichlorohydrin resin.
3. The elasticity-modified resin for oil well cement according to claim 1, wherein the epoxy resin curing agent is one or more of an aromatic amine curing agent, an alicyclic amine curing agent, a polyamide curing agent and an organic acid anhydride curing agent.
4. A method for preparing the elastic modified resin for cement according to any one of claims 1 to 3, comprising the steps of:
step 1, weighing an epoxy resin base solution and an epoxy resin curing agent according to any one of the parts by weight of claims 1 to 3;
and 2, mixing the epoxy resin base liquid and the epoxy resin curing agent in parts by weight in the step 1, and uniformly stirring to obtain the elastic modified resin.
5. The well cementation cement slurry is characterized by comprising the following raw material components in parts by weight: 100 parts of cement, 36-44 parts of fresh water, 3-6 parts of fluid loss additive, 0.1-0.6 part of dispersing agent, 1-4 parts of early strength agent, 2-5 parts of reinforcing agent, 0.2-0.6 part of retarder, 0.5-1.5 parts of defoaming agent and 20-50 parts of elastic modified resin, wherein the elastic modified resin is the elastic modified resin for oil well cement as defined in any one of claims 1-3.
6. The well cementation cement slurry of claim 5, wherein the fluid loss additive is one or more of carboxymethyl cellulose, polyethyleneimine, polyacrylamide and a copolymer of 2-acrylamide-2-methylpropanesulfonic acid/acrylamide.
7. The cementing slurry of claim 5, wherein the dispersant is one or more of calcium lignosulfonate, polynaphthalene sulfonate, polymaleic anhydride and styrene-maleic anhydride sulfonated copolymer.
8. The well cementation cement slurry of claim 5, wherein the early strength agent is one or more of calcium chloride, sodium silicate, formamide and triethanolamine;
the reinforcing agent is one or more of micro silicon, superfine slag and silicon powder.
9. The well cementation cement slurry of claim 5, wherein the retarder is one or more of sodium citrate, sodium tartrate, sulfonated tannin and boric acid;
the defoaming agent is one or more of glyceryl polyether, silicon ether oil, siloxane and tributyl phosphate.
10. A method of preparing a well cementation cement slurry as claimed in any one of claims 5 to 9, the method comprising the steps of:
step 1, dry-mixing cement, a dispersing agent, a fluid loss agent, an early strength agent and a reinforcing agent according to the parts by weight of any one of claims 5 to 9 to obtain mixed dry powder;
step 2, dissolving the retarder, the defoaming agent and the elastic modified resin in parts by weight according to any one of claims 5 to 9 in water, and uniformly stirring to obtain a mixed aqueous solution;
and 3, adding the mixed dry powder obtained in the step 1 into the mixed aqueous solution obtained in the step 2, and uniformly stirring to obtain the cement slurry for well cementation.
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| CN201911068883.9A CN110845705A (en) | 2019-11-05 | 2019-11-05 | Elastic modified resin for oil well cement and preparation method and application thereof |
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Cited By (7)
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| CN111307690A (en) * | 2020-04-13 | 2020-06-19 | 西南石油大学 | Packing performance testing device and method for annular cement ring of oil-gas well cylinder |
| CN113388077A (en) * | 2021-06-22 | 2021-09-14 | 西南石油大学 | High-temperature-resistant self-crosslinking water-based epoxy resin for oil well cement |
| CN113845890A (en) * | 2020-06-28 | 2021-12-28 | 中国石油化工股份有限公司 | Borehole wall repairing agent suitable for broken stratum and preparation method and application thereof |
| CN114516737A (en) * | 2022-03-25 | 2022-05-20 | 西南石油大学 | Water-invasion-resistant cement slurry for cementing water-bearing stratum and preparation method thereof |
| CN114686192A (en) * | 2020-12-25 | 2022-07-01 | 中石化石油工程技术服务有限公司 | High-temperature-resistant high-elasticity epoxy resin well cementing fluid and preparation method thereof |
| CN114835442A (en) * | 2022-04-22 | 2022-08-02 | 中海石油(中国)有限公司 | Liquid cementing material and preparation method thereof |
| CN115504713A (en) * | 2022-09-09 | 2022-12-23 | 长江大学 | Pre-cured resin-based cement slurry with high cementing toughness for shaft plugging as well as preparation method and application thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307690A (en) * | 2020-04-13 | 2020-06-19 | 西南石油大学 | Packing performance testing device and method for annular cement ring of oil-gas well cylinder |
| CN111307690B (en) * | 2020-04-13 | 2022-05-06 | 西南石油大学 | Packing performance testing device and method for annular cement ring of oil-gas well cylinder |
| CN113845890A (en) * | 2020-06-28 | 2021-12-28 | 中国石油化工股份有限公司 | Borehole wall repairing agent suitable for broken stratum and preparation method and application thereof |
| CN114686192A (en) * | 2020-12-25 | 2022-07-01 | 中石化石油工程技术服务有限公司 | High-temperature-resistant high-elasticity epoxy resin well cementing fluid and preparation method thereof |
| CN113388077A (en) * | 2021-06-22 | 2021-09-14 | 西南石油大学 | High-temperature-resistant self-crosslinking water-based epoxy resin for oil well cement |
| CN113388077B (en) * | 2021-06-22 | 2022-05-13 | 西南石油大学 | High-temperature-resistant self-crosslinking water-based epoxy resin for oil well cement |
| CN114516737A (en) * | 2022-03-25 | 2022-05-20 | 西南石油大学 | Water-invasion-resistant cement slurry for cementing water-bearing stratum and preparation method thereof |
| CN114835442A (en) * | 2022-04-22 | 2022-08-02 | 中海石油(中国)有限公司 | Liquid cementing material and preparation method thereof |
| CN115504713A (en) * | 2022-09-09 | 2022-12-23 | 长江大学 | Pre-cured resin-based cement slurry with high cementing toughness for shaft plugging as well as preparation method and application 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 |
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