CN111233363A - Low-density reinforcing agent for oil well cement and preparation method thereof - Google Patents
Low-density reinforcing agent for oil well cement and preparation method thereof Download PDFInfo
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- CN111233363A CN111233363A CN202010114570.9A CN202010114570A CN111233363A CN 111233363 A CN111233363 A CN 111233363A CN 202010114570 A CN202010114570 A CN 202010114570A CN 111233363 A CN111233363 A CN 111233363A
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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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- 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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/473—Density reducing additives, e.g. for obtaining foamed cement compositions
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a low-density reinforcing agent for oil well cement and a preparation method thereof, wherein the low-density reinforcing agent comprises a special early strength agent, micro silicon powder and superfine slag powder, and the special early strength agent comprises one or more of the following components: anhydrous sodium sulfate, ammonium aluminum sulfate, calcium chloride, polyaluminum chloride, nano-silica, hydrotalcite, and a mixture of white carbon black and triisopropanolamine. The fluidity of cement paste prepared from the low-density reinforcing agent for oil well cement is 23-25 cm, and the fluidity of the cement paste is good; the difference of the pressurized density of the cement paste is less than or equal to 0.02g/cm3The cement paste has better stability; zero free water can be realized; the cement paste has fast strength development, the 24-hour compressive strength reaches more than 7MPa, and the 48-MPa compressive strength reaches more than 10MPaThe above step (1); the thickening time is good in linearity, the phenomena of rising and bulging are avoided, and the comprehensive performance of the cement paste is good.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and development. In particular to a low-density reinforcing agent for oil well cement and a preparation method thereof.
Background
Along with the process of oil exploration and development, more and more oil-gas wells are in low-pressure stratum, weak stratum and other easily-leaked stratum, and a low-density cement slurry system is a main method for solving the problem of low-pressure easily-leaked stratum well cementation.
The lightening materials of the conventional low-density cement paste system are as follows:
(1) the fly ash low-density cement paste system has the defects of long thickening time, low cement stone strength and the like;
(2) the bentonite influences thickening time and slurry fluidity, and meanwhile, the cement stone strength is lower;
(3) the common floating beads have poor pressure resistance, and although the pressure resistance of the floating beads and the glass beads in the power plant is improved, the cost is high, and the large-area popularization and use cannot be realized.
The low density admixture as shown in table 1 is compared in material availability and cost control:
TABLE 1
Therefore, the existing low-density cement slurry system has the problems of poor pressure resistance, poor slurry stability, low compressive strength and the like, and particularly, the low-density admixture has difficulty in material availability and cost control and is difficult to meet the requirements of cost reduction and efficiency improvement of various large oil fields.
Therefore, the low-density reinforcing agent with stable performance, high compressive strength and low cost is designed to meet the well cementation requirement, and the improvement of the well cementation quality is of great importance.
Disclosure of Invention
Therefore, the invention aims to provide a low-density reinforcing agent for oil well cement, which has stable performance, high compressive strength and low cost, and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
a low-density reinforcing agent for oil well cement comprises the following components: special early strength agent, micro silicon powder and superfine slag powder.
The low-density reinforcing agent for the oil well cement comprises the following components in parts by weight: 220-280 parts of special early strength agent, 450-700 parts of micro silicon powder and 120-200 parts of superfine slag powder.
The superfine slag powder is S95-grade granulated blast furnace slag powder; the particle size of the micro silicon powder is 160-300 meshes.
The special early strength agent for the low-density reinforcing agent for the oil well cement comprises a mixture of white carbon black and triisopropanolamine and one or more of the following components: anhydrous sodium sulfate, aluminum ammonium sulfate, calcium chloride, polyaluminum chloride, nano silicon dioxide and hydrotalcite.
The low-density reinforcing agent for the oil well cement comprises the following special early strength agent in parts by weight: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminum chloride, 5-20 parts of nano silicon dioxide, 32-60 parts of hydrotalcite and 5-10 parts of a mixture of white carbon black and triisopropanolamine; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
The preparation method of the low-density reinforcing agent for the oil well cement comprises the following steps:
(1) preparing a special early strength agent;
(2) adding silica fume and stirring;
(3) adding the superfine slag powder, and continuously stirring to obtain the low-density reinforcing agent for the oil well cement.
In the step (1), the special early strength agent is composed of 5-10 parts of a mixture of white carbon black and triisopropanolamine and one or more of the following components in parts by weight: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminium chloride, 5-20 parts of nano silicon dioxide and 32-60 parts of hydrotalcite; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
The preparation method of the low-density reinforcing agent for the oil well cement specifically comprises the following steps in the step (1): (1-1) adding a mixture of white carbon black and triisopropanolamine into a mixing kettle, and mixing for 20 min; (1-2) adding other components of the special early strength agent into the mixing kettle.
According to the preparation method of the low-density reinforcing agent for the oil well cement, 450-700 parts of micro silicon powder is added in the step (2), and stirring is carried out for 20 min; and (4) adding 120-200 parts of superfine slag powder in the step (3), and continuing stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for the oil well cement.
The preparation method of the low-density reinforcing agent for oil well cement,
(1) adding 5-10 parts of a mixture of white carbon black and triisopropanolamine into a mixing kettle, and mixing for 20 min; adding other components of the special early strength agent into the mixing kettle; the special early strength agent comprises the following other components in parts by weight: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminium chloride, 5-20 parts of nano silicon dioxide and 32-60 parts of hydrotalcite; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
(2) Adding 450-700 parts of micro silicon powder, and stirring for 20 min;
(3) adding 120-200 parts of superfine slag powder, and continuing stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for oil well cement.
The technical scheme of the invention achieves the following beneficial technical effects:
the fluidity of cement paste prepared from the low-density reinforcing agent for oil well cement is 23-25 cm, and the fluidity of the cement paste is good; the difference of the pressurized density of the cement paste is less than or equal to 0.02g/cm3The cement paste has better stability; zero free water was achieved in example 3; the strength of the set cement is fast to develop, the 24-hour compressive strength reaches more than 7MPa, and the 48-MPa compressive strength reaches more than 10 MPa; the thickening time is good in linearity, the phenomena of rising and bulging are avoided, and the comprehensive performance of the cement paste is good. The low-density reinforcing agent for oil well cement, which is prepared by the method, has the advantages of easily obtained raw materials and low price, greatly reduces the production cost, and can meet the requirements of cost reduction and efficiency improvement of various large oil fields.
Drawings
FIG. 1 cement thickening test graph for cement slurries formulated with low density strength additives for oil well cement of example 1 of the present invention (Sichuan Jiahua cement 100 parts by weight + low density strength additive 18 wt.% (ash content) + water-to-solid ratio 0.66);
FIG. 2 cement thickening test graph for cement slurries formulated with low density enhancers for oil well cements of the present invention example 2 (100 parts by weight of Sichuan Jiahua cement + 18 wt% (on ash basis) + water-to-solid ratio 0.66);
FIG. 3 is a graph showing the cement thickening test of cement slurries formulated with low density reinforcing agents for oil well cements of the present invention example 3 (100 parts by weight of Sichuan Jiahua cement + 18 wt% (on ash basis) + water-to-solid ratio of 0.66);
FIG. 4 is a graph showing the cement thickening test of cement slurries formulated with low density reinforcing agents for oil well cements of the present invention example 3 (100 parts by weight of Sichuan Jiahua cement + 30 wt% (on ash basis) + 0.78 water-to-solid ratio);
FIG. 5 is a cement thickening test graph of a cement slurry system with the power plant floating beads as a low-density admixture (Sichuan Jiahua cement 100+ 12% power plant floating beads + 1.8% G33S + 1.5% G204+ water-to-solid ratio 0.70);
FIG. 6 is a cement thickening test graph of a cement paste system with glass floating beads as a low-density admixture (Sichuan Jiahua cement 100+ 7% of glass beads + 4% of silica fume + 2% of G33S + 2% of G204+ water-to-solid ratio 0.50);
FIG. 7 is a cement thickening test graph of a cement slurry system with fly ash as a low density admixture (Sichuan Jiahua cement 100+ 35% fly ash + 1.8% G33S + 2.0% G204+ water-to-solid ratio 0.85);
FIG. 8 is a graph showing cement thickening test curves for a cement slurry system using fly ash and bentonite as low-density admixtures (Sichuan Jiahua cement 100+ 25% fly ash + 10% microsilica + 5% bentonite + 5% G33S + 2.5% G204+ water-to-solid ratio 0.80).
Detailed Description
Example 1
The low-density reinforcing agent for oil well cement of the embodiment consists of the following components: 232kg of special early strength agent, 600kg of micro silicon powder and 168kg of superfine slag powder. The superfine slag powder is S95-grade granulated blast furnace slag powder; the particle size of the micro silicon powder is 160-300 meshes.
The special early strength agent consists of the following substances: 90kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 50kg of calcium chloride, 40kg of polyaluminium chloride and 10kg of a mixture of white carbon black and triisopropanolamine, wherein the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
The preparation method of the low-density reinforcing agent for the oil well cement comprises the following steps:
(1) adding 10kg of a mixture of the white carbon black and the triisopropanolamine into a mixing kettle, and mixing for 20 min;
(2) sequentially adding 90kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 50kg of calcium chloride and 40kg of polyaluminium chloride into the mixing kettle, and stirring for 30min to uniformly stir;
(3) adding 600kg of micro silicon powder, and stirring for 20 min;
(4) adding 168kg of superfine slag powder, and stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for the oil well cement.
Example 2
The low-density reinforcing agent for oil well cement of the embodiment consists of the following components: 246kg of special early strength agent, 600kg of micro silicon powder and 154kg of superfine slag powder. The superfine slag powder is S95-grade granulated blast furnace slag powder; the particle size of the micro silicon powder is 160-300 meshes.
The special early strength agent consists of the following substances: 90kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 50kg of calcium chloride, 40kg of polyaluminium chloride, 14kg of nano-silica and 10kg of a mixture of white carbon black and triisopropanolamine, wherein the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
The preparation method of the low-density reinforcing agent for the oil well cement comprises the following steps:
(1) adding 10kg of a mixture of the white carbon black and the triisopropanolamine into a mixing kettle, and mixing for 20 min;
(2) sequentially adding 90kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 50kg of calcium chloride, 40kg of polyaluminium chloride and 14kg of nano silicon dioxide into the mixing kettle, and stirring for 30min to uniformly stir;
(3) adding 600kg of micro silicon powder, and stirring for 20 min;
(4) adding 154kg of superfine slag powder, and stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for the oil well cement.
Example 3
The low-density reinforcing agent for oil well cement of the embodiment consists of the following components: 246kg of special early strength agent, 600kg of micro silicon powder and 154kg of superfine slag powder. The superfine slag powder is S95-grade granulated blast furnace slag powder; the particle size of the micro silicon powder is 160-300 meshes.
The special early strength agent consists of the following substances: 50kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 40kg of calcium chloride, 40kg of polyaluminium chloride, 14kg of nano-silica, 50kg of hydrotalcite and 10kg of a mixture of white carbon black and triisopropanolamine, wherein the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
The preparation method of the low-density reinforcing agent for the oil well cement comprises the following steps:
(1) adding 10kg of a mixture of the white carbon black and the triisopropanolamine into a mixing kettle, and mixing for 20 min;
(2) sequentially adding 50kg of anhydrous sodium sulphate, 42kg of ammonium aluminum sulfate, 40kg of calcium chloride, 40kg of polyaluminium chloride, 14kg of nano-silica and 50kg of hydrotalcite into a mixing kettle, and stirring for 30min to uniformly stir;
(3) adding 600kg of micro silicon powder, and stirring for 20 min;
(4) adding 154kg of superfine slag powder, stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for the oil well cement
Examples 1-3 testing of Low Density intensifier Cement slurries for oil well cements
The cement slurries prepared using the low-density reinforcing agents for oil-well cement prepared in examples 1 to 3 were tested for compressive strength and stability.
The cement paste reference formula is as follows: 100 portions of Sichuan Jiahua cement, 18 weight percent of low-density reinforcing agent (accounting for ash content percent) and 0.66 of water-solid ratio.
The specific test results are shown in table 2:
TABLE 2
From example 1 to example 3 in table 2, it can be seen that: the special early strength agent is reasonably used, so that the fluidity of cement paste prepared from the low-density reinforcing agent for oil well cement is 23-25 cm, and the fluidity of the cement paste is good; the difference of the pressurized density of the cement paste is less than or equal to 0.02g/cm3The cement paste has better stability; zero free water was achieved in example 3; the strength of the set cement is fast to develop, the 24-hour compressive strength reaches more than 7MPa, and the 48-MPa compressive strength reaches more than 10 MPa; as shown in the figures 1-3, the thickening time is good in linearity, the phenomena of rising and bulging are avoided, and the comprehensive performance of the cement paste is good.
The cement slurry formulated with the low density reinforcing agent for oil well cement of example 3 was mixed with other conventional low density cement slurries
Comparison of systems
The low-density reinforcing agent for oil well cement prepared in example 3 has the same density (the cement slurry density is 1.55 g/cm) as the power plant floating bead, the glass microsphere, the fly ash and the bentonite3) And comparing the experimental performance of the cement slurry system under the same experimental conditions, wherein the experimental data are shown in Table 3.
TABLE 3
Remarking: the oil well cement fluid loss additive G33S and the oil well cement early strength additive G204 are products which are publicly sold in the market by Wei Hui chemical company Limited. The addition amounts of G33S and G204 are based on the total solid content, and the addition amounts of the power plant floating beads, the glass microspheres, the micro silicon powder, the fly ash and the bentonite are based on the ash amount.
The low-density reinforcing agent prepared in the embodiment 3 can reach the index performance of high-cost power plant floating beads and glass beads; the coal ash has long thickening time and low compressive strength; the bentonite influences thickening time and cement strength, and slurry flowability is poor; in the system of fly ash and bentonite, all properties of the cement paste system are not ideal.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. The low-density reinforcing agent for oil well cement is characterized by comprising the following components: special early strength agent, micro silicon powder and superfine slag powder.
2. The low-density reinforcing agent for oil well cement according to claim 1, wherein the weight ratio of each component is as follows: 220-280 parts of special early strength agent, 450-700 parts of micro silicon powder and 120-200 parts of superfine slag powder.
3. The low density reinforcing agent for oil well cement according to claim 1, wherein the ultrafine slag powder is granulated blast furnace slag powder of grade S95; the particle size of the micro silicon powder is 160-300 meshes.
4. The low density enhancer for oil well cement as claimed in claim 1, wherein the special early strength agent is composed of a mixture of white carbon black and triisopropanolamine and one or more of the following components: anhydrous sodium sulfate, aluminum ammonium sulfate, calcium chloride, polyaluminum chloride, nano silicon dioxide and hydrotalcite.
5. The low-density reinforcing agent for oil well cement as claimed in claim 4, wherein the weight ratio of the special early strength agent is as follows: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminum chloride, 5-20 parts of nano silicon dioxide, 32-60 parts of hydrotalcite and 5-10 parts of a mixture of white carbon black and triisopropanolamine; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
6. The method for producing a low-density reinforcing agent for oil well cement according to claims 1 to 5, characterized by comprising the steps of:
(1) preparing a special early strength agent;
(2) adding silica fume and stirring;
(3) adding the superfine slag powder, and continuously stirring to obtain the low-density reinforcing agent for the oil well cement.
7. The preparation method of the low-density reinforcing agent for oil well cement as claimed in claim 6, wherein in the step (1), the special early strength agent is composed of 5-10 parts of a mixture of white carbon black and triisopropanolamine and one or more of the following components in parts by weight: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminium chloride, 5-20 parts of nano silicon dioxide and 32-60 parts of hydrotalcite; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
8. The method for producing a low-density reinforcing agent for oil well cement according to claim 7, characterized by comprising the steps of: (1-1) adding a mixture of white carbon black and triisopropanolamine into a mixing kettle, and mixing for 20 min; (1-2) adding other components of the special early strength agent into the mixing kettle.
9. The method for preparing the low-density reinforcing agent for oil well cement according to claim 7, wherein 450 to 700 parts of silica fume is added in the step (2), and the mixture is stirred for 20 min; and (4) adding 120-200 parts of superfine slag powder in the step (3), and continuing stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for the oil well cement.
10. The method for producing a low-density reinforcing agent for oil well cement according to claim 6,
(1) adding 5-10 parts of a mixture of white carbon black and triisopropanolamine into a mixing kettle, and mixing for 20 min; adding other components of the special early strength agent into the mixing kettle; the special early strength agent comprises the following other components in parts by weight: 50-90 parts of anhydrous sodium sulphate, 30-60 parts of ammonium aluminum sulfate, 35-60 parts of calcium chloride, 30-50 parts of polyaluminium chloride, 5-20 parts of nano silicon dioxide and 32-60 parts of hydrotalcite; in the mixture of white carbon black and triisopropanolamine: the mass ratio of the white carbon black to the triisopropanolamine is 3: 2.
(2) Adding 450-700 parts of micro silicon powder, and stirring for 20 min;
(3) adding 120-200 parts of superfine slag powder, and continuing stirring for 20min to uniformly stir the materials to obtain the low-density reinforcing agent for oil well cement.
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| CN112979194A (en) * | 2021-02-09 | 2021-06-18 | 内蒙古宏尔高新材料科技有限公司 | Chlorine-free high-temperature-resistant mineral type early strength agent for well cementation cement slurry and preparation method thereof |
| CN113234424A (en) * | 2021-05-20 | 2021-08-10 | 嘉华特种水泥股份有限公司 | Low-density well cementation cement slurry system suitable for medium-high temperature stratum and preparation method thereof |
| CN116425505A (en) * | 2022-11-15 | 2023-07-14 | 中国石油天然气集团有限公司 | Intensity stabilizer for shale oil in-situ conversion ultra-high temperature working condition well cementation and preparation method thereof |
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