CN113548838A - Fresh water salt-resistant tough cement slurry for gas storage - Google Patents
Fresh water salt-resistant tough cement slurry for gas storage Download PDFInfo
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- CN113548838A CN113548838A CN202010326201.6A CN202010326201A CN113548838A CN 113548838 A CN113548838 A CN 113548838A CN 202010326201 A CN202010326201 A CN 202010326201A CN 113548838 A CN113548838 A CN 113548838A
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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
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
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- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a fresh water salt-resistant tough cement slurry system for a gas storage, which comprises the following components in parts by weight: 100 parts of G-grade cement, 42 parts of fresh water, 0.3-0.5 part of an acetone-formaldehyde condensate dispersant, 3-3.5 parts of a modified rubber powder elastic agent, 0.3-0.5 part of an aluminum powder gas-forming expanding agent, 0.1-0.2 part of a fluid loss additive ZYJ-1L4, 0.5-1.5 parts of basalt fiber, 0.5-1.5 parts of a polyaluminium chloride compound aluminosilicate salt-resistant coagulant and 0.2-0.3 part of a polyether defoamer. The invention improves the performance of cement paste by mixing G-grade oil well cement with salt-resistant fluid loss additive, salt-resistant coagulant, expanding agent, elastic agent, fiber, dispersant and other additives by fresh water, has stable performance under the corrosion of 9% and 18% of salt, is successfully applied to Wen 23 gas storage, and meets the construction requirement of the gas storage.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas well cementation cement slurry, in particular to fresh water salt-resistant tough cement slurry for a gas storage reservoir, which takes a salt layer as a cover layer.
Background
Along with the increase of the national demand for clean energy, the natural gas is used as clean energy with larger and larger consumption, and the use of the natural gas is characterized in that the consumption in winter is far greater than that in summer, and the gas storage has good peak regulation effect, so that the supply problem of the natural gas can be effectively relieved. The original oilfield is located in the North China natural gas peak regulation center, the original oilfield is constructed by taking a giant thick salt layer with the thickness of 200-500 m as a cover layer, the loss of stored gas can be effectively prevented, high-pressure gas injection and low-pressure gas production are carried out in the production process of the gas storage, a cement stone needs to have certain toughness, otherwise, the micro gap is generated to cause poor sealing, and therefore whether the well cementation quality of a salt layer section is sealed and the load of a cement ring resisting alternating stress is a key factor for the success or failure of the construction of the gas storage.
At present, a saturated or semi-saturated salt-containing cement slurry system is adopted for cement slurry of the related technology of ultra-thick salt bed well cementation, and the quality requirement of cover layer well cementation of a gas storage reservoir has continuous high-quality sealing of 25 m. Patent CN107794012A discloses a toughened expanded cement slurry for gas storage well cementation, which adopts a toughening agent compounded by modified styrene-butadiene rubber and polypropylene fiber, and a modified PVA-based fluid loss additive of polymer latex, although micro-expansion, high strength and low elastic modulus are realized, the salt resistance of the system is not strong, under the erosion action of salt, the consolidation time after the hydration reaction of the cement slurry is long, even the strength is not exerted, the excellent yield of salt layer section consolidation in practical application is less than 25%, and the shut-down of the gas storage reservoir of Wen 23 is caused for two months. The patent CN1919963A is applicable to salt water cement slurry of a salt cavern gas storage, salt water with the concentration of 15% -18% is added in a system, the thickening time of the system is long, the brittleness of a set cement is high, and the sealing failure of a cement sheath is easily caused under the effect of long-term injection and production exchange allergy, so that the service life of the gas storage is influenced.
Aiming at the above problems, how to ensure that the strength development of the cement stone is not influenced under the salt erosion condition and the elastic modulus of the cement stone is reduced to be within 8GPa is a technical problem which needs to be solved urgently.
Disclosure of Invention
In view of the above, the present invention is to provide a fresh water salt-resistant tough cement slurry for gas storage, which has good properties.
The invention provides higher requirements for a cement paste system for meeting the sealing quality of the salt layer of the Wen 23 gas storage reservoir, and CL is determined according to the early stage of construction from injection to return of the spacer fluid-The normal undersaturated cement paste CL is increased from 1 ten thousand to 4 ten thousand to 10 ten thousand-The content is generally 17 to 18 thousands, so that the preparation of the salt-resistant cement paste by adopting fresh water is theoretically feasible, the workload of preparing salt water is reduced by actual operation, the difficulty of construction organization is reduced, and the labor intensity is reduced.
The invention provides fresh water salt-resistant tough cement slurry for a gas storage, which comprises the following components in parts by weight:
100 parts of oil well cement, namely,
42 parts of water, namely, water,
0.3 to 0.5 part of a dispersant,
3 to 3.5 parts of an elastic agent,
0.3 to 0.5 part of an expanding agent,
4-5 parts of a fluid loss agent,
0.1 to 0.2 part of fiber,
0.5 to 1.5 parts of coagulant,
0.2-0.3 part of defoaming agent.
In the invention, the oil well cement is preferably G-grade oil well cement, such as Jiahua G-grade oil well cement, Guzhou dam G-grade oil well cement or Yaowangshan G-grade oil well cement; the G-grade cement is basic cement, has wide application range and can meet the requirements of almost all well type cementing. The source of the oil well cement is not particularly limited, and the oil well cement can be purchased from the market.
In the present invention, the weight part of the dispersant is preferably 0.4 min. In the present invention, the dispersant is preferably an acetone-formaldehyde condensate, and the source of the dispersant is not particularly limited in the present invention and is commercially available.
In the invention, the expanding agent (main material) is preferably aluminum powder, and the expanding agent (main material) is subjected to chemical reaction under alkaline conditions to generate hydrogen so as to expand the volume of the cement; the source of the swelling agent is not particularly limited in the present invention, and the swelling agent is commercially available.
In the present invention, the fluid loss agent is preferably:
products obtained by polymerizing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and organic phosphates.
In the present invention, the preparation method of the fluid loss agent preferably includes:
under the action of an initiator and a molecular regulator, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and organic phosphate react to obtain the water loss agent.
In the present invention, the initiator is preferably selected from sodium thiosulfate.
In the present invention, the molecular regulator is preferably a metal salt molecular regulator, more preferably ferrous sulfate or MgCl2。
In the present invention, the organic phosphate is preferably HEDP. Na (sodium hydroxyethylidene diphosphonate) or HEDP. Kx (potassium hydroxyethylidene diphosphonate).
In the invention, the mass ratio of the acrylamide, the 2-acrylamide-2-methylpropanesulfonic acid, the acrylic acid, the organic phosphate, the initiator and the molecular regulator is preferably (600-650): (50-100): 50:50: (2-5): (1-2), more preferably (610-640): (60-90): 50:50: (3-4): (1.2-1.8), most preferably (620-630): (70-80): 50:50: (3.2-3.8): (1.4-1.6).
In the invention, the pH value of the reaction is preferably 7-8, and an alkaline solution such as a sodium hydroxide solution is preferably adopted to adjust the pH value of the reaction system to 7-8.
In the present invention, it is preferable that the molecular weight of the obtained fluid loss additive is controlled to 25X 10 by using a molecular regulator4～35×104。
In the invention, the reaction temperature is preferably 25-60 ℃, more preferably 30-55 ℃, and most preferably 35-50 ℃; the reaction is preferably carried out under the condition of stirring, and the reaction time is preferably 480-640 min, more preferably 500-600 min, and most preferably 540-560 min.
In the present invention, the setting accelerator is preferably selected from polyaluminium chloride or complex aluminosilicates; the compound aluminosilicate preferably contains CaO and CaCl2，MgO，MgSO4The compound aluminosilicate. The source of the accelerator is not particularly limited and may be commercially available.
In the invention, the fibers are preferably basalt fibers, and the diameter of the fibers is preferably 0.3-0.5 mm, and more preferably 0.4 mm. The source of the fiber is not particularly limited in the present invention and is commercially available.
In the present invention, the elastic agent is preferably modified rubber powder; the source of the elastomer is not particularly limited in the present invention and may be commercially available.
In the present invention, the defoaming agent is preferably selected from polyethers and silicones. The source of the defoaming agent is not particularly limited in the present invention, and the defoaming agent can be obtained commercially.
In the present invention, the water is preferably fresh water.
The preparation method of the fresh water salt-resistant toughness cement slurry for the gas storage is not particularly limited, and the fresh water salt-resistant toughness cement slurry for the gas storage in the technical scheme is prepared by mixing the components in parts by weight.
The invention mixes and mixes the oil well cement with the expanding agent, the salt-resistant fluid loss agent, the dispersing agent, the salt-resistant coagulant, the fiber, the elastic agent and the fresh water according to a certain proportion, improves the salt-resistant capability of a cement paste system, improves the early strength, ensures that the performance of the prepared cement paste meets the construction requirement of the Wen 23 gas storage, and ensures the well cementation quality and the later exploitation of the Wen 23 gas storage.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
The raw materials used in the following embodiments of the invention are all commercial products, and the G-grade cement is Jiahua G-grade oil well cement; the dispersant is an acetone-formaldehyde condensate USZ provided by a dulcimer chemical plant; the elastic agent is a product M91S supplied by Puyang Ming Hua chemical industry Co., Ltd; the expanding agent is G502S product provided by Henan Qingfengtai and factories; the antifoaming agent is G603L supplied by the dulling chemical plant; the fiber is an XW product provided by Sichuan Hongshan Cheng oil engineering technical service limited company; the salt-resistant coagulant is a product M71S supplied by Puyang Ming Hua chemical Co.
The fluid loss agent is prepared by the following method:
adopting a water-soluble polymerization method: in a reaction kettle, 630 weight parts of acrylamide, 70 weight parts of 2-acrylamide-2-methylpropanesulfonic acid, 50 weight parts of acrylic acid and 50 weight parts of HEDP. Na are mixed by a sodium hydroxide solution to adjust the pH value to 7-8, the initiator is 3 weight parts of sodium thiosulfate and MgCl is added21.5 parts by weight, with the molecular weight controlled at 25X 104～35×104And controlling the reaction temperature to be 45 ℃, and stirring at a constant speed for 560min to obtain the fluid loss agent with the code number ZYJ-1L.
Example 1
The embodiment is a reservoir salt layer segment sealing cement slurry system for reservoir 23, which comprises the following raw materials in parts by weight: 100 parts of G-grade cement, 42 parts of fresh water, 0.3 part of a dispersing agent USZ, 3.0 parts of an elastic agent M91S 3.0, 0.3 part of an expanding agent G502S 0.3, 4 parts of a fluid loss agent ZYJ-1L, 0.1 part of fiber WX, 0.5 part of a salt-resistant coagulant M71S 0.5 and 0.2 part of a defoaming agent G603L 0.2.
The preparation method comprises the following steps: mixing the raw materials in parts by weight.
Example 2
The embodiment is a reservoir salt layer segment sealing cement slurry system for reservoir 23, which comprises the following raw materials in parts by weight: 100 parts of G-grade cement, 42 parts of fresh water, 0.5 part of a dispersing agent USZ, 3.0 parts of an elastic agent M91S 3.0, 0.5 part of an expanding agent G502S 0.5, 5 parts of a fluid loss agent ZYJ-1L, 0.1 part of fiber WX, 71S 1.0.0 parts of a salt-resistant coagulant, and 0.3 part of a defoaming agent G603L 0.3.
The preparation method comprises the following steps: mixing the raw materials in parts by weight.
Example 3
The embodiment is a reservoir salt layer segment sealing cement slurry system for reservoir 23, which comprises the following raw materials in parts by weight: 100 parts of G-grade cement, 42 parts of fresh water, 0.5 part of a dispersing agent USZ, 3.5 parts of an elastic agent M91S 3.5, 0.5 part of an expanding agent G502S 0.5, 5 parts of a fluid loss agent ZYJ-1L, 0.1 part of fiber WX, 71S 1.5.5 parts of a salt-resistant coagulant, and 0.3 part of a defoaming agent G603L 0.3.
The preparation method comprises the following steps: mixing the raw materials in parts by weight.
The performance of the gas storage salt layer section sealing cement slurry system obtained in the embodiment 1-3 of the invention is detected, the detection method is evaluated according to the standards of GB/T19139-:
TABLE 1 results of measuring the Properties of the grouts prepared in examples 1 to 3 of the present invention
As can be seen from Table 1, the cement slurries prepared in the examples of the present invention have a density of 1.90g/cm3The fluidity is 20-22 cm, the slurry fluidity is good, the water loss is controlled within 50mL, the free liquid is 0mL, the thickening time is less than 150min, and the performance meets the conventional design requirement.
TABLE 2 Cement Performance test results
As can be seen from Table 2, in the embodiment of the invention, the 48h compressive strength of the set cement is more than 14MPa, the elastic modulus is less than 8GPa, the compressive strength is high, the requirement on well cementation quality is met, the elastic modulus is small, the damage of injection-production alternating stress of the gas storage to a cement sheath is met, and the integrity of a salt cap gas storage shaft can be realized.
Because the invention is a fresh water base, the cement paste is contacted with the salt layer in the upward returning process, CL-1The content was increased to 18 ten thousand at the maximum, and thus the salt resistance evaluation was performed by simulating the process.
Salt resistance evaluation method: 9 parts and 18 parts (by weight) of salt (NaCl) are added in example 1, example 2 and example 3 respectively, the detection method is evaluated according to the standard of GB/T19139-:
TABLE 3 determination of salt resistance of cement slurries
The performance of the salt cement slurry added in 9 parts and 18 parts in the embodiments 1-3 is not changed greatly, the water loss is still controlled within 50mL, the thickening time is slightly increased, but can still be controlled within 150min, and the performance meets the well cementation design requirement of a salt cap gas storage.
TABLE 4 Cement Performance test results (salt resistance)
As can be seen from Table 4, after 9 parts and 18 parts of salt are added into the cement paste, the compressive strength of the cement paste can still be higher than 14MPa within 48h, the elastic modulus is less than 8GPa, the performance is stable, the compressive strength is high, the requirement of well cementation quality is met, the elastic modulus is small, the damage of injection-production alternating stress of the gas storage to a cement sheath is met, and the integrity of a salt cover gas storage shaft can be realized.
From the above embodiments, the invention discloses a fresh water salt-resistant tough cement slurry system for a gas storage, which comprises the following components in parts by weight: 100 parts of G-grade cement, 42 parts of fresh water, 0.3-0.5 part of an acetone-formaldehyde condensate dispersant, 3-3.5 parts of a modified rubber powder elastic agent, 0.3-0.5 part of an aluminum powder gas-forming expanding agent, 4-5 parts of a fluid loss agent ZYJ-1L, 0.1-0.2 part of basalt fiber, 0.5-1.5 parts of a polyaluminium chloride compound aluminosilicate salt-resistant coagulant and 0.2-0.3 part of a polyether defoamer. The invention improves the performance of cement paste by mixing G-grade oil well cement with salt-resistant fluid loss additive, salt-resistant coagulant, expanding agent, elastic agent, fiber, dispersant and other additives by fresh water, has stable performance under the corrosion of 9% and 18% of salt, is successfully applied to Wen 23 gas storage, and meets the construction requirement of the gas storage.
The foregoing description is only a preferred embodiment of the present invention, and various modifications and changes will occur to those skilled in the art. 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.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A fresh water salt-resistant tough cement slurry for a gas storage comprises the following components in parts by weight:
100 parts of oil well cement, namely,
42 parts of water, namely, water,
0.3 to 0.5 part of a dispersant,
3 to 3.5 parts of an elastic agent,
0.3 to 0.5 part of an expanding agent,
4-5 parts of a fluid loss agent,
0.1 to 0.2 part of fiber,
0.5 to 1.5 parts of coagulant,
0.2-0.3 part of defoaming agent.
2. The fresh water salt-resistant tough cement slurry for the gas storage reservoir as claimed in claim 1, wherein the oil well cement is oil well G-grade cement.
3. The fresh water salt-resistant tough cement slurry for the gas storage according to claim 1, wherein the water is fresh water.
4. The fresh water salt-resistant tough cement slurry for the gas storage according to claim 1, wherein the fluid loss agent is:
products obtained by polymerizing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and organic phosphates.
5. The fresh water salt-resistant tough cement slurry for the gas storage according to claim 1, wherein the elastic agent is modified rubber powder.
6. The fresh water salt-resistant tough cement slurry for the gas storage according to claim 1, wherein the accelerator is selected from polyaluminium chloride or compound aluminosilicate.
7. The fresh water salt-resistant tough cement slurry for gas storage according to claim 1, wherein the dispersant is selected from a formaldehyde acetone condensate.
8. The fresh water salt-resistant tough cement slurry for gas storage according to claim 1, wherein the swelling agent is selected from aluminum powder.
9. The fresh water salt-resistant tough cement slurry for gas storage according to claim 1, wherein the defoaming agent is selected from polyethers and silicones.
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Citations (6)
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|---|---|---|---|---|
| CN1919963A (en) * | 2006-08-11 | 2007-02-28 | 中国石油天然气股份有限公司 | Brine cement slurry adapted for salt hole air reserved storeroom |
| CN103865501A (en) * | 2014-02-28 | 2014-06-18 | 中国石油集团渤海钻探工程有限公司 | Low-density cement paste for salt-cavern gas storage well cementation |
| CN107794012A (en) * | 2016-09-05 | 2018-03-13 | 中石化石油工程技术服务有限公司 | Toughness reinforcing expansion cement slurry is used in a kind of gas storage well cementation |
| CN109852352A (en) * | 2017-11-30 | 2019-06-07 | 中石化石油工程技术服务有限公司 | A kind of organic phospho acid polymer fluid loss agent and its preparation method and application |
| CN109851710A (en) * | 2017-11-30 | 2019-06-07 | 中石化石油工程技术服务有限公司 | A kind of organic phospho acid polymer fluid loss agent resistant to high temperatures and its preparation method and application |
| US20190241792A1 (en) * | 2018-02-02 | 2019-08-08 | China National Petroleum Corporation | High temperature resistant portland cement slurry and production method thereof |
-
2020
- 2020-04-23 CN CN202010326201.6A patent/CN113548838B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919963A (en) * | 2006-08-11 | 2007-02-28 | 中国石油天然气股份有限公司 | Brine cement slurry adapted for salt hole air reserved storeroom |
| CN103865501A (en) * | 2014-02-28 | 2014-06-18 | 中国石油集团渤海钻探工程有限公司 | Low-density cement paste for salt-cavern gas storage well cementation |
| CN107794012A (en) * | 2016-09-05 | 2018-03-13 | 中石化石油工程技术服务有限公司 | Toughness reinforcing expansion cement slurry is used in a kind of gas storage well cementation |
| CN109852352A (en) * | 2017-11-30 | 2019-06-07 | 中石化石油工程技术服务有限公司 | A kind of organic phospho acid polymer fluid loss agent and its preparation method and application |
| CN109851710A (en) * | 2017-11-30 | 2019-06-07 | 中石化石油工程技术服务有限公司 | A kind of organic phospho acid polymer fluid loss agent resistant to high temperatures and its preparation method and application |
| US20190241792A1 (en) * | 2018-02-02 | 2019-08-08 | China National Petroleum Corporation | High temperature resistant portland cement slurry and production method thereof |
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