CN108793783B - Shale gas horizontal well cementing cement and shale gas horizontal well cementing cement slurry - Google Patents
Shale gas horizontal well cementing cement and shale gas horizontal well cementing cement slurry Download PDFInfo
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- CN108793783B CN108793783B CN201810779118.7A CN201810779118A CN108793783B CN 108793783 B CN108793783 B CN 108793783B CN 201810779118 A CN201810779118 A CN 201810779118A CN 108793783 B CN108793783 B CN 108793783B
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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
- C04B11/00—Calcium sulfate cements
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
-
- 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
- C04B28/14—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 containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to shale gas horizontal well cementing cement and shale gas horizontal well cementing cement slurry, wherein the shale gas horizontal well cementing cement comprises cement clinker and gypsum; the mineral composition of the cement clinker comprises the following components in percentage by weight: tricalcium silicate: 40-55 percent; dicalcium silicate: 25 to 40 percent; tetracalcium aluminoferrite: 15 to 25 percent. The shale gas horizontal well cementing cement can effectively solve the problem of brittle failure of cement stone in shale gas horizontal well cementing engineering, is simple and easy to obtain in a preparation method, can replace the existing shale gas well cementing cement, and is beneficial to structural durability and safety of the shale gas horizontal well cementing engineering.
Description
Technical Field
The invention relates to the field of cement preparation, in particular to shale gas horizontal well cementing cement and shale gas horizontal well cementing cement slurry.
Background
The cement is made up by using proper raw materials, designing proper specific value and components and making them pass through the process of "two-grinding and one-burning" process, so that it is a hydraulic cementing material with extensive production and application. For a long time, the chemical composition and mineral composition of portland cement are not substantially changed, and the technical development is mainly production processes and equipment.
At present, the oil and gas resource demand and supply of China areShows the trend of 'two-rise and one-decrease' that the demand and the external dependence degree rise year by year and the quantity of the oil and gas resources which are easy to move in the shallow layer decreases year by year. The outline of the national middle and long-term scientific and technical development planning (2006-2020) ranks "exploration, development and utilization of complex geological oil and gas resources" as a subject of preferential development in the energy field. The shale gas is used as a new natural gas ore species in China, and preliminary prediction shows that the geological reserve of the shale gas in China is (15-30) multiplied by 1012m3. According to the plan of national development and improvement committee, the shale gas yield reaches (600-8m3And has very wide exploitation prospect. The shale gas reservoir belongs to a low-permeability gas reservoir, generally adopts horizontal well development, has complex well completion measures and has very high requirements on well cementation quality. Due to the characteristics of easy collapse and easy leakage of the shale gas reservoir, more production increasing measures in the later period, long production period and the like, the shale gas-solid well difficulty is far greater than that of a conventional oil well. However, the existing well cementation cement-based material in China has a plurality of defects that cement stones are easy to crack under the condition of large-scale fracture strong alternating load, so that the well cementation cement sheath sealing fails, and the challenges are brought to the well cementation sealing quality and safety.
The existing shale gas horizontal well cementing cement generally takes G-grade oil well cement as basic cement, and is prepared on the basis of adding admixture such as fly ash, slag and the like and a retarder so as to meet the requirements of cementing construction. However, the brittleness of a hydration product under the combined action of large-scale fracturing load and temperature is determined by the calcium-silicon ratio of the G-grade cement mineral, so that the structure is unstable, and the long-term durability of the well cementation cement sheath is insufficient although the well cementation requirement is met by simply adding the admixture, so that the recovery ratio of the oil-gas well is influenced.
Disclosure of Invention
The invention mainly aims to provide novel shale gas horizontal well cementing cement and shale gas horizontal well cementing cement slurry, and aims to solve the technical problems that the shale gas horizontal well cementing cement has excellent thickening performance and better strength stability, is beneficial to the construction safety and structural durability of well cementing engineering, and is more practical.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The shale gas horizontal well cementing cement provided by the invention comprises cement clinker and gypsum; the mineral composition of the cement clinker comprises the following components in percentage by weight:
tricalcium silicate: 40-55 percent;
dicalcium silicate: 25 to 40 percent;
tetracalcium aluminoferrite: 15 to 25 percent.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the shale gas horizontal well cementing cement is obtained by grinding and calcining raw materials, wherein the raw materials comprise, by weight:
calcareous raw materials: 70-85%;
clay raw material: 5 to 30 percent;
iron powder: 0 to 10 percent;
industrial waste residues: 0 to 40 percent;
correcting raw materials: 0 to 40 percent;
wherein the iron powder, the industrial waste residue and the correction raw material are not 0 at the same time.
Preferably, the cement for cementing the shale gas horizontal well has a weight ratio of cement clinker to gypsum of 96:4-94: 6.
Preferably, the shale gas horizontal well cementing cement is formed by mixing gypsum, dihydrate gypsum, anhydrite or industrial by-product gypsum.
Preferably, the specific surface area of the shale gas horizontal well cementing cement is 280-400m2/kg。
Preferably, the shale gas horizontal well cementing cement has a thickening time of 90-180 min; the compressive strength is more than or equal to 25MPa after curing for 48 hours at 38 ℃; after curing for 48h at 50-150 ℃, the compressive strength is more than or equal to 25MPa, and the elastic modulus is less than 6GPa after 48 h.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. The invention provides a shale gas horizontal well cementing cement slurry which comprises the following components in parts by weight:
shale gas horizontal well cementing cement: 100 parts of (A);
water: 44-50 parts;
high temperature resistant retarder: 1-5 parts;
fluid loss agent: 1-8 parts;
wherein the shale gas horizontal well cementing cement is the shale gas horizontal well cementing cement.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the shale gas horizontal well cementing cement slurry is formed by mixing a high-temperature resistant retarder and a non-lignin yellowing salt.
Preferably, the shale gas horizontal well cementing cement slurry is prepared by mixing a fluid loss agent and a fluid loss agent, wherein the fluid loss agent is at least one of carboxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl hydroxyethyl cellulose.
By the technical scheme, the shale gas horizontal well cementing cement and the shale gas horizontal well cementing cement slurry have the following advantages:
1) the shale gas horizontal well cementing cement can meet the higher and more updated requirements of shale gas horizontal well engineering on cement-based materials, is an ideal cementing material which is more suitable for large-scale fracturing condition cementing of shale gas horizontal well than the G-grade oil well cement which is generally adopted at present, and is favorable for improving the performance of cementing cement stones, prolonging the service life of the cementing engineering and having wide market prospect and potential;
2) the shale gas horizontal well cementing cement can effectively solve the key technical bottleneck of cement-based materials in complex shale gas horizontal well cementing engineering, saves investment and reduces maintenance. The well cementation quality can be greatly improved, the number of waste wells is reduced, and the oil gas recovery ratio is improved;
3) the shale gas horizontal well cementing cement has the characteristics of wide raw material source, equivalent cost, simple preparation process and the like, can be widely applied to the production and cementing construction units of the existing cement enterprises in China to prepare cementing cement slurry, and has good economic and social benefits.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the specific implementation, structure, characteristics and effects of the shale gas horizontal well cement slurry and the shale gas horizontal well cement slurry according to the present invention in combination with the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The shale gas horizontal well cementing cement provided by one embodiment of the invention comprises cement clinker and gypsum; the mineral composition of the cement clinker comprises the following components in percentage by weight:
tricalcium silicate: 40-55 percent;
dicalcium silicate: 25 to 40 percent;
tetracalcium aluminoferrite: 15 to 25 percent.
Preferably, the cement clinker is obtained by grinding and calcining a raw meal, said raw meal comprising, in weight percent:
calcareous raw materials: 70-85%;
clay raw material: 5 to 30 percent;
iron powder: 0 to 10 percent;
industrial waste residues: 0 to 40 percent;
correcting raw materials: 0 to 40 percent;
wherein the iron powder, the industrial waste residue and the correction raw material are not 0 at the same time.
Preferably, the weight ratio of cement clinker to gypsum is 96:4 to 94: 6.
Preferably, the gypsum is dihydrate gypsum, anhydrite or industrial by-product gypsum.
Preferably, the first and second liquid crystal materials are,the specific surface area of the shale gas horizontal well cementing cement is 280-400m2/kg。
Preferably, the thickening time of the shale gas horizontal well cementing cement is 90-180 min; the compressive strength is more than or equal to 25MPa after curing for 48 hours at 38 ℃; the compressive strength is more than or equal to 25MPa after curing for 48 hours at 50-150 ℃, and compared with the normal temperature of 38 ℃, the strength degradation rate is avoided, and the elastic modulus is less than 6GPa after 48 hours.
Another embodiment of the present invention provides a shale gas horizontal well cementing cement slurry, which comprises the following components in parts by weight:
shale gas horizontal well cementing cement: 100 parts of (A);
water: 44-50 parts;
high temperature resistant retarder: 1-5 parts;
fluid loss agent: 1-8 parts;
wherein the shale gas horizontal well cementing cement is the shale gas horizontal well cementing cement.
Preferably, the high temperature resistant retarder is citric acid and/or a non-lignin yellowing salt.
Preferably, the fluid loss additive is at least one of carboxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl hydroxyethyl cellulose.
The raw materials of inventive examples 1-5 are shown in Table 1.
TABLE 1 shale gas horizontal well cementing cement raw material formula (unit: weight percentage)
According to the above examples, the invention proposes the mineral composition of the cement clinker of the following shale gas horizontal well cementing cement examples 1-5 as shown in table 2.
TABLE 2 Cement Clinker composition of shale gas horizontal well cementing cements examples 1-5
After the shale gas horizontal well cementing cement of examples 1 to 5 was ground to a suitable fineness, a physical property test of the cement (refer to a specific surface area test method, the Bosch method) was carried out, and the results are shown in Table 3.
TABLE 3 examples 1-5 specific surface areas of shale gas horizontal well cementing cements
| Specific surface area, m2/kg | |
| Example 1 | 305 |
| Example 2 | 322 |
| Example 3 | 332 |
| Example 4 | 345 |
| Example 5 | 361 |
After the cement for cementing the horizontal well of the rock gas of the embodiment 1-5 is ground to a proper fineness, the physical performance test of the cement is carried out (refer to GB/T10238-2015), and the thickening time results are shown in Table 4.
Table 4 examples 1-5 specific surface areas of shale gas horizontal well cementing cements
| Thickening time, min | |
| Example 1 | 95 |
| Example 2 | 103 |
| Example 3 | 112 |
| Example 4 | 116 |
| Example 5 | 132 |
After the shale gas horizontal well cementing cement of the embodiment 1-5 is ground to a proper fineness, the physical property test of the cement is carried out (refer to GB/T10238-2015), and the results of the normal temperature compressive strength and the high temperature compressive strength are shown in tables 5 and 6.
TABLE 5 examples 1-5 Normal temperature compressive strength results for shale gas horizontal well cementing cement
TABLE 6 examples 1-5 high temperature compressive strength results for shale gas horizontal well cementing cement
After the shale gas horizontal well cementing cement of the embodiment 1-5 is ground to a proper fineness, the elastic modulus test (static method) of the cement is carried out, and the results are shown in table 7.
TABLE 7 elastic modulus results for shale gas horizontal well cementing cements from examples 1-5
According to the above embodiments, the present invention proposes the following shale gas horizontal well cementing slurries, the compositions of which of examples 1-5 are shown in table 8.
TABLE 8 examples 1-5 compositions (unit: parts by weight) of shale gas horizontal well cementing slurries
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (7)
1. The shale gas horizontal well cementing cement slurry is characterized by comprising the following components in parts by weight:
shale gas horizontal well cementing cement: 100 parts of (A);
water: 44-50 parts;
high temperature resistant retarder: 1-5 parts;
fluid loss agent: 1-8 parts;
the shale gas horizontal well cementing cement comprises cement clinker and gypsum; the mineral composition of the cement clinker comprises the following components in percentage by weight:
tricalcium silicate: 40-55 percent;
dicalcium silicate: 25 to 40 percent;
tetracalcium aluminoferrite: 15 to 25 percent;
the thickening time of the shale gas horizontal well cementing cement is 90-180 min; the compressive strength is more than or equal to 25MPa after curing for 48 hours at 38 ℃; after curing for 48h at 50-150 ℃, the compressive strength is more than or equal to 25MPa, and the elastic modulus is less than 6GPa after 48 h.
2. The shale gas horizontal well cementing cement slurry as claimed in claim 1, wherein said cement clinker is obtained by grinding and calcining raw materials, said raw materials comprising, in weight percent:
calcareous raw materials: 70-85%;
clay raw material: 5 to 30 percent;
iron powder: 0 to 10 percent;
industrial waste residues: 0 to 40 percent;
correcting raw materials: 0 to 40 percent;
wherein the iron powder, the industrial waste residue and the correction raw material are not 0 at the same time.
3. The shale gas horizontal well cementing cement slurry as claimed in claim 1, wherein the weight ratio of the cement clinker to the gypsum is 96:4-94: 6.
4. The shale gas horizontal well cementing cement slurry as claimed in claim 1, wherein said gypsum is dihydrate gypsum, anhydrite or industrial by-product gypsum.
5. The shale gas horizontal well cementing cement slurry as claimed in claim 1, wherein the specific surface area of the shale gas horizontal well cementing cement is 280-400m2/kg。
6. The shale gas horizontal well cementing cement slurry as claimed in claim 5, wherein said high temperature resistant retarder is citric acid and/or non-lignin sulfonated salt.
7. The shale gas horizontal well cementing cement slurry as claimed in claim 6, wherein said fluid loss additive is at least one of carboxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl hydroxyethyl cellulose.
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| CN112094060A (en) * | 2020-09-27 | 2020-12-18 | 大连水泥集团有限公司 | High-temperature well cementation cement and preparation method and application thereof |
| CN113149475A (en) * | 2021-04-22 | 2021-07-23 | 尧柏特种水泥技术研发有限公司 | Preparation method of oil-gas well cement for shale gas well cementation engineering |
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| CN101134892A (en) * | 2007-10-09 | 2008-03-05 | 中国石油大学(华东) | Deepwater well cementing mortar architecture |
| CN103613293A (en) * | 2013-05-09 | 2014-03-05 | 中国建筑材料科学研究总院 | Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof |
| CN104371678A (en) * | 2014-11-06 | 2015-02-25 | 中国石油天然气集团公司 | Expanded flexible well cementing grout and preparation method thereof |
| CN104418512A (en) * | 2013-09-06 | 2015-03-18 | 如皋市滨江城建投资有限公司 | Cement clinker |
| CN105439481A (en) * | 2015-11-16 | 2016-03-30 | 中国建筑材料科学研究总院 | Method for increasing content of periclase in high-magnesium moderate-heat cement clinker |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134892A (en) * | 2007-10-09 | 2008-03-05 | 中国石油大学(华东) | Deepwater well cementing mortar architecture |
| CN103613293A (en) * | 2013-05-09 | 2014-03-05 | 中国建筑材料科学研究总院 | Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof |
| CN104418512A (en) * | 2013-09-06 | 2015-03-18 | 如皋市滨江城建投资有限公司 | Cement clinker |
| CN104371678A (en) * | 2014-11-06 | 2015-02-25 | 中国石油天然气集团公司 | Expanded flexible well cementing grout and preparation method thereof |
| CN105439481A (en) * | 2015-11-16 | 2016-03-30 | 中国建筑材料科学研究总院 | Method for increasing content of periclase in high-magnesium moderate-heat cement clinker |
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