CN113149475A - Preparation method of oil-gas well cement for shale gas well cementation engineering - Google Patents
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- 239000004568 cement Substances 0.000 title claims abstract description 142
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 37
- 239000011707 mineral Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 31
- 239000010440 gypsum Substances 0.000 claims abstract description 24
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 24
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 10
- 235000019738 Limestone Nutrition 0.000 claims abstract description 7
- 238000001354 calcination Methods 0.000 claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 239000006028 limestone Substances 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 25
- 230000008719 thickening Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 235000012054 meals Nutrition 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 59
- 239000003129 oil well Substances 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical 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
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of oil-gas well cement for shale gas well cementing engineering, which comprises the following steps: mixing and grinding 76-82% of limestone, 2-6% of slag, 4-10% of aeolian sand and 4-8% of iron correction raw materials in percentage by mass to obtain cement raw materials; calcining the cement raw materials at the temperature of 1350-; the cement for the oil and gas well is obtained by grinding 90-95% of cement clinker, 3-6% of natural dihydrate gypsum and 1-5% of mineral modified material in percentage by mass.
Description
Technical Field
The invention belongs to the field of oil field well cementation, and particularly relates to a preparation method of oil-gas well cement for shale gas well cementation engineering.
Background
In recent years, shale gas exploration and development make a significant breakthrough, corresponding development technologies become research hotspots, and exploitation and utilization of shale gas can greatly improve the proportion of clean energy in the total energy, and is beneficial to reducing the pressure of China in the aspect of carbon emission. Along with the continuous deepening of shale gas exploration and development, the development technology develops towards a deep well, so the probability of drilling a well in a high-temperature and high-pressure stratum is obviously increased, because most shale gases adopt a mining mode of combining a horizontal well drilling technology and a volume fracturing technology, most of shale gas engineering well cementation currently adopts G-grade basic oil-gas well cement, the G-grade oil-gas well cement cannot well meet the requirements of shale gas process well cementation on the aspects of the sufficiency of cement slurry thickening time, the toughness and the durability of cement stones and the like, the cost is undoubtedly increased by modifying through an admixture and an additive, the requirements of shale gas well cementation engineering on the well cementation quality at the present stage are higher and higher, the service environment is poorer and poorer, according to the requirements of the shale gas well cementation engineering on the cement quality, the cement slurry has good rheological property, sufficient process thickening time and guarantees and low cement stone brittleness, the special oil well cement has good toughness, good working stability of cement slurry under severe environment service conditions such as deep wells, high temperature and high pressure, high later strength enhancement rate of set cement and good durability, and has good market prospect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of oil and gas well cement for shale gas well cementation engineering, which changes the particle composition and physical properties of the cement by technical measures of replacing main raw materials in the preparation of cement raw materials, controlling the content of key minerals in the preparation of cement clinker, selecting a single-bin cement mill and adjusting the grading of a grinding body in the preparation of the cement, doping a certain amount of mineral modified materials in the preparation of the cement and the like, so that the various properties of the cement provided by the method are superior to those of the conventional oil and gas well cement used in the existing shale gas and gas well engineering.
In order to achieve the above purpose, the present disclosure provides the following technical solutions:
a preparation method of oil-gas well cement for shale gas well cementing engineering comprises the following steps:
s100: mixing and grinding 76-82% of limestone, 2-6% of slag, 4-10% of aeolian sand and 4-8% of iron correction raw materials in percentage by mass to obtain cement raw materials;
s200: calcining the cement raw materials at the temperature of 1350-;
s300: the cement for the oil and gas well is obtained by grinding 90-95% of cement clinker, 3-6% of natural dihydrate gypsum and 1-5% of mineral modified material in percentage by mass.
Preferably, in the cement raw material, the screen residue of a 0.08mm square hole screen is 16-20%, and the screen residue of a 0.2mm square hole screen is 0.4-1.2%.
Preferably, the mineral modified material comprises a specific surface area of 400-500m2Active mineral with activity index of 70-100% per kg.
Preferably, the mineral modified material comprises any one of: slag, fly ash, and pozzolanic materials.
Preferably, the oil and gas well cement meets the following indexes:
the process thickening time is controlled as follows: 40Bc is more than or equal to 70min, and 70Bc is more than or equal to 90 min;
the 90-day compressive strength/28-day compressive strength is more than or equal to 1.1;
the corrosion resistance coefficient of the sulfate is more than or equal to 1.2;
young's modulus of elasticity is less than or equal to 6.0 GPa;
less than or equal to 13.0 percent of particles with the diameter less than 3 mu m and less than or equal to 4.0 percent of particles with the diameter more than 80 mu m.
The present disclosure also provides an apparatus for preparing oil and gas well cement, comprising:
the single-bin ball mill is connected with a gypsum adding device and a mineral modified material adding device, wherein,
the ball mill is used for grinding the mixed limestone, furnace slag, aeolian sand and iron correction raw materials to obtain cement raw materials;
the cement rotary kiln is used for calcining cement raw materials to obtain cement clinker;
the gypsum adding device is used for adding natural dihydrate gypsum into the single-bin ball mill,
the mineral modified material adding device is used for adding mineral modified materials into the single-bin ball mill,
the single-bin ball mill is used for grinding the mixed cement clinker, the natural dihydrate gypsum and the mineral modified material to obtain the oil-gas well cement.
Preferably, in the single-bin ball mill, the average diameter of the grinding bodies is increased by 5-10mm, and the proportion of the grinding bodies with the increased average diameter is increased by 10-20%.
The present disclosure also provides an oil and gas well cement for shale gas well cementing engineering, which comprises the following raw materials by mass:
90 to 95 percent of cement clinker
3 to 6 percent of natural dihydrate gypsum
1-5% of mineral modified material.
Preferably, the cement clinker contains 26-28% of C2S and 16-18% of C4AF。
Preferably, the cement clinker comprises the following raw materials in percentage by mass:
compared with the prior art, the beneficial effect that this disclosure brought does: the particle composition and physical properties of cement are changed by replacing main raw materials in the preparation of cement raw materials, controlling the content of key minerals in the preparation of cement clinker, selecting a single-bin cement mill and adjusting the grading of a grinding body in the preparation of cement, adding a certain amount of mineral modified materials in the preparation of cement and other technical measures, so that various properties of the cement provided by the method are superior to those of conventional oil-gas well cement used in the conventional shale gas-solid well engineering.
Drawings
Fig. 1 is a flow chart of a method for preparing oil and gas well cement for shale gas cementing engineering according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of an oil and gas well cement preparation device for shale gas cementing engineering according to another embodiment of the present disclosure;
the reference numerals in the drawings are as follows:
1. a ball mill; 2. a cement rotary kiln; 3. a single bin ball mill; 4. a gypsum adding device 5 and a mineral modified material adding device.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to fig. 1 to 2. While specific embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present disclosure is to be determined by the terms of the appended claims.
To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present disclosure.
In one embodiment, as shown in fig. 1, a method for preparing oil and gas well cement for shale gas cementing engineering comprises the following steps:
s100: mixing and grinding 76-82% of limestone, 2-6% of slag, 4-10% of aeolian sand and 4-8% of iron correction raw materials in percentage by mass to obtain cement raw materials;
s200: calcining the cement raw materials at the temperature of 1350-;
s300: the cement for the oil and gas well is obtained by grinding 90-95% of cement clinker, 3-6% of natural dihydrate gypsum and 1-5% of mineral modified material in percentage by mass.
In another embodiment, the residue on a 0.08mm square mesh sieve is 16-20% and the residue on a 0.2mm square mesh sieve is 0.4-1.2% in the cement raw meal.
In another embodiment, the mineral-modified material comprises a specific surface area of 400-500m2Active mineral with activity index of 70-100% per kg.
In the embodiment, the rheological property and the toughness of the cement paste can be improved by adding a certain mineral modified material.
In another embodiment, the mineral-modified material comprises any of: slag, fly ash, and pozzolanic materials.
In another embodiment, the oil and gas well cement meets the following criteria:
the process thickening time is controlled as follows: 40Bc is more than or equal to 70min, and 70Bc is more than or equal to 90 min;
the 90-day compressive strength/28-day compressive strength is more than or equal to 1.1;
the corrosion resistance coefficient of the sulfate is more than or equal to 1.2;
young's modulus of elasticity is less than or equal to 6.0 GPa;
less than or equal to 13.0 percent of particles with the diameter less than 3 mu m and less than or equal to 4.0 percent of particles with the diameter more than 80 mu m.
The conventional oil and gas well cement has no requirement on controlling the thickening time in the process, and in the embodiment, the fluidity of the cement can be increased by controlling the thickening time in the cement process to a certain extent. The 90-day compressive strength/28-day compressive strength of the existing oil and gas well cement is generally about 0.95, the 90-day compressive strength/28-day compressive strength of the oil and gas well cement prepared by the method can reach more than 1.1, and the durability of the cement is greatly improved; the sulfate corrosion resistance coefficient of the existing oil and gas well cement is generally about 1.0, and the sulfate corrosion resistance coefficient of the oil and gas well cement prepared by the method can reach more than 1.2, so that the corrosion resistance of the cement is greatly improved. In addition, the Young's modulus of elasticity of the conventional oil and gas well cement is generally more than 6.5GPa, while the Young's modulus of elasticity of the oil and gas well cement prepared by the method is not more than 6.0GPa, so that the toughness of the oil and gas well cement prepared by the method is better than that of the conventional oil and gas well cement.
In another embodiment, the present disclosure also provides an apparatus for preparing cement for an oil and gas well, comprising:
the rotary cement kiln comprises a ball mill 1, a rotary cement kiln 2 and a single-bin ball mill 3 which are connected in sequence, wherein the single-bin ball mill 3 is connected with a gypsum adding device 4 and a mineral modified material adding device 5,
the ball mill is used for grinding the mixed limestone, furnace slag, aeolian sand and iron correction raw materials to obtain cement raw materials;
the cement rotary kiln is used for calcining cement raw materials to obtain cement clinker;
the gypsum adding device is used for adding natural dihydrate gypsum into the single-bin ball mill,
the mineral modified material adding device is used for adding mineral modified materials into the single-bin ball mill,
the single-bin ball mill is used for grinding the mixed cement clinker, the natural dihydrate gypsum and the mineral modified material to obtain the oil-gas well cement.
In another embodiment, the average diameter of the grinding bodies in the single-bin ball mill is increased by 5-10mm, and the proportion of the grinding bodies with the increased average diameter is increased by 10-20%.
In the embodiment, the initial fluidity of the cement of the conventional oil and gas well is generally about 220mm, and the average diameter and the ratio of the grinding bodies are increased, so that the over-grinding in the mill can be eliminated, and the initial fluidity of the cement can be increased to over 240 mm.
In another embodiment, the present disclosure further provides an oil and gas well cement for shale gas well cementing engineering, which comprises the following raw materials by mass:
90 to 95 percent of cement clinker
3 to 6 percent of natural dihydrate gypsum
1-5% of mineral modified material
The cement clinker contains 26-28% of C2S and 16-18% of C4AF。
In another embodiment, the cement clinker comprises the following raw materials in percentage by mass:
hereinafter, embodiments of the present disclosure will be described in detail, and the following embodiments are only used for more clearly illustrating the technical solutions of the present disclosure, and the protection scope of the present disclosure is not limited thereby.
1. Preparing G-grade oil well cement: selecting 96% G-grade oil well clinker and 4% natural dihydrate gypsum
The rice two-bin closed-circuit cement is prepared by grinding, and the inspection result is shown in table 1:
TABLE 1
2. Preparing oil-gas well cement: selecting 96% of clinker special for shale gas cement and 4% of natural dihydrate gypsum
The rice two-bin closed-circuit cement is prepared by grinding, and the inspection result is shown in table 2:
TABLE 2
3. Preparing oil-gas well cement: selecting 96% of clinker special for shale gas cement and 4% of natural dihydrate gypsum, and using the modified clinker
The single-bin closed-circuit cement grinding machine is prepared by grinding rice, and the inspection result is shown in table 3:
TABLE 3
4. Preparing oil-gas well cement: selecting 92% of special clinker for shale gas cement, 4% of natural dihydrate gypsum and 4% of mineral modified material, and using the modified material
The single-bin closed-circuit cement grinding machine is prepared by grinding rice, and the inspection results are shown in table 4:
TABLE 4
The analysis of the test results shows that:
the G-grade high-sulfate-resistance oil well cement slurry in the table 1 has high initial thickening and poor rheological property, the total thickening time can meet the requirements of GB/T10238 standard, but the thickening time in the process is insufficient, the later high-temperature curing strength of the set cement is slightly reduced, the Young modulus is high, and the toughness of the set cement is poor;
in table 2, key minerals in clinker are controlled, and the Young modulus of the set cement of the shale gas-solid well cement produced under the original cement grinding process condition is reduced, which shows that the toughness of the set cement is improved, the later-stage high-temperature curing strength and the sulfate erosion resistance of the set cement are improved and are superior to those of G-grade high-sulfate-resistance oil well cement, but the performances of cement paste are not changed greatly;
in table 3, the cement preparation process is innovatively improved, the partition plate of the cement mill is removed, a single-bin cement mill is selected, the gradation of the mill body is adjusted, the average diameter of the mill body is properly increased by 5-10mm, and the proportion of the mill body with the average diameter is increased by 10-20%, so that the rheological property and the process thickening time of the obtained oil well cement are greatly improved, and other properties also meet the technical requirements of the design disclosed by the disclosure;
in table 4, certain mineral modified materials are added according to the requirements of the cement for shale gas-solid well on the strength and toughness of the set cement. As can be seen from the inspection results, the rheology and toughness of the cement paste are improved, and other properties also meet the technical requirements of the design of the present disclosure.
The oil and gas well cement for shale gas engineering disclosed by the invention is mainly used for improving the performance of a product by technical measures such as redesign of mineral composition of clinker, equipment transformation, addition of modified minerals and the like, so that the cement can better meet the requirements of shale gas engineering well cementation, and is simple in process and strong in operability.
Claims (10)
1. A preparation method of oil-gas well cement for shale gas well cementing engineering comprises the following steps:
s100: mixing and grinding 76-82% of limestone, 2-6% of slag, 4-10% of aeolian sand and 4-8% of iron correction raw materials in percentage by mass to obtain cement raw materials;
s200: calcining the cement raw materials at the temperature of 1350-;
s300: the cement for the oil and gas well is obtained by grinding 90-95% of cement clinker, 3-6% of natural dihydrate gypsum and 1-5% of mineral modified material in percentage by mass.
2. The method according to claim 1, wherein the cement raw meal has a 0.08mm square mesh screen residue of 16-20% and a 0.2mm square mesh screen residue of 0.4-1.2%.
3. The method as claimed in claim 1, wherein the mineral modified material comprises a specific surface area of 400-500m2Active mineral with activity index of 70-100% per kg.
4. An oil and gas well cement as claimed in claim 1 or 3, wherein the mineral modifying material comprises any of: slag, fly ash, and pozzolanic materials.
5. The method of claim 1, wherein the oil and gas well cement meets the following criteria:
the process thickening time is controlled as follows: 40Bc is more than or equal to 70min, and 70Bc is more than or equal to 90 min;
the 90-day compressive strength/28-day compressive strength is more than or equal to 1.1;
the corrosion resistance coefficient of the sulfate is more than or equal to 1.2;
young's modulus of elasticity is less than or equal to 6.0 GPa;
less than or equal to 13.0 percent of particles with the diameter less than 3 mu m and less than or equal to 4.0 percent of particles with the diameter more than 80 mu m.
6. An apparatus for performing the method of claim 1, comprising:
the single-bin ball mill is connected with a gypsum adding device and a mineral modified material adding device, wherein,
the ball mill is used for grinding the mixed limestone, furnace slag, aeolian sand and iron correction raw materials to obtain cement raw materials;
the cement rotary kiln is used for calcining cement raw materials to obtain cement clinker;
the gypsum adding device is used for adding natural dihydrate gypsum into the single-bin ball mill,
the mineral modified material adding device is used for adding mineral modified materials into the single-bin ball mill,
the single-bin ball mill is used for grinding the mixed cement clinker, the natural dihydrate gypsum and the mineral modified material to obtain the oil-gas well cement.
7. A method according to claim 1, wherein in the single-bin ball mill the average diameter of the grinding bodies is increased by 5-10mm and the percentage of grinding bodies having an increased average diameter is increased by 10-20%.
8. An oil and gas well cement prepared according to the method of claim 1, comprising the following raw materials in percentage by mass:
90 to 95 percent of cement clinker
3 to 6 percent of natural dihydrate gypsum
1-5% of mineral modified material.
9. Oil and gas well cement according to claim 8, wherein the cement clinker contains 26-28% C2S and 16-18% of C4AF。
10. An oil and gas well cement as claimed in claim 8, wherein the cement clinker comprises the following raw materials in percentage by mass:
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