CN112723822B - Low hydration heat low density cement slurry system for well cementation and preparation method and application thereof - Google Patents
Low hydration heat low density cement slurry system for well cementation and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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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- 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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- 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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- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
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Abstract
The invention provides a low hydration heat low density cement slurry system for well cementation and a preparation method and application thereof, wherein the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat silicate cement; 30-40 parts of composite lightening material; 2-3 parts of a fluid loss agent; 0-0.15 part of retarder; 0-1.5 parts of a reinforcing agent; 70-85 parts of water. The low hydration heat low density cement slurry system prepared by the invention has a wider temperature application range: 40-85 ℃, moderate density application range: 1.25-1.45g/cm 3 (ii) a Compared with a G-grade cement low-density system under the same condition, the thickening time is longer (prolonged by 40-80min), and the setting strength is higher (improved by 15-30%) for 24/48 h. Meanwhile, the performance of a formula system is adjusted, a reasonable one-way adjustment space is reserved, the contradiction and the difficulty of simultaneous use of a retarder and an intensifier in the existing system are solved, and the use amount of the admixture is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of well cementation, and particularly relates to a low-hydration-heat low-density cement slurry system for well cementation and a preparation method and application thereof.
Background
The construction of well cementation and cement injection is to inject cement slurry between the stratum and the casing in a shaft, and after the cement slurry is solidified, the functions of separating the stratum with different pressures and supporting and protecting the casing are achieved; the good cementing quality is one of key technologies for ensuring the service life of oil and gas wells, improving the recovery ratio and reasonably developing oil and gas fields. With the progress of well drilling technology, the number of deep wells, ultra-deep wells, special wells and difficult wells encountered in well cementation is increasing, and in order to solve a series of special problems, various special cement slurry systems for well cementation are continuously created.
In well cementation of oil and gas wells in Changqing, in order to shorten the well construction period, one-time upward return sealing is generally adopted, low-density slurry needs to be injected into a well bottom from a casing pipe of a well head, then is replaced by an annular space between the casing pipe of the well bottom and a stratum to return to the well head, and needs to endure large temperature difference change of the well head-the well bottom-the well head; in order to ensure construction safety and well cementation quality, the low-density slurry can be subsequently thickened and solidified only after being solidified in a tail slurry section of a sealing production layer at the lower part of a shaft, a retarder is generally designed to prolong the thickening and solidifying time of the low-density slurry, the shaft bottom temperature is adopted as a design temperature condition, but a low-density system returns to the middle upper part of the shaft after passing through the shaft bottom, the low-density slurry is actually in a state of being lower than the design temperature for a long time, and the actual thickening and solidifying time is generally longer than the design time; long-time slow setting leaves a large window for invasion and channeling damage cement annular fixation time for active formation fluid at the upper part of a shaft, and the well cementation quality is influenced; only various early strength and coagulant are added into the system, thereby accelerating the solidification closing time and reducing the invasion damage; the added early-strength and quick-setting admixture can obviously shorten the thickening and solidification time length of the simple body, and influence the construction safety and the pressure stability of a target layer section.
The obvious contradiction exists in the system design, which causes difficulty in the field performance adjustment of the low-density system and influences the well cementation quality. In order to solve the problems fundamentally, the composition of cement components must be studied more deeply, components which can meet the well cementation construction time and can be cemented and solidified quickly are added, and components which do not meet the design requirements are reduced; the difficulty of adjusting the performance of the system by using the admixture is reduced, the design and site construction risks are reduced, and the problem of improving the quality of a low-density system is fundamentally solved.
Disclosure of Invention
The first purpose of the invention is to provide low-heat portland cement which has the characteristics of low heat release rate, high later-stage strength, good erosion resistance and the like, and ensures that the later-stage setting strength meets the standard requirement.
The second purpose of the invention is to provide a low hydration heat low density cement slurry system for well cementation, which comprises the low heat silicate cement, solves the defects of the existing low density cement slurry system, reduces the addition of additives, and improves the well cementation quality and the production benefit of oil and gas wells.
The third purpose of the invention is to provide a preparation method of the low hydration heat low density cement slurry system for well cementation.
The fourth purpose of the invention is to provide the application of the low hydration heat and low density cement paste system for well cementation in the well cementation operation of oil and gas wells.
In order to achieve the above purpose of the present invention, the present invention adopts the following technical scheme:
the invention provides a low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in parts by weight:
a low hydration heat low density cement slurry system for well cementation comprises the following components in parts by weight:
as a further preferable technical scheme, the low-heat silicate cement comprises the following mineral components in percentage by mass: 28 to 33 percent of tricalcium silicate; 42 to 48 percent of dicalcium silicate; 0-3% of tricalcium aluminate; 15 to 17 percent of tetracalcium aluminoferrite; 3-4% of calcium oxide; the balance being mixed mineral components.
As a further preferable aspect, the content of the mixed mineral component is less than 5% by mass.
Specifically, the mixed mineral component is MgO or SO 3 Or a mixture thereof.
Preferably, the particle size of the low-heat portland cement is 2.0-150 mu m, and the heat release rate 3d hydration heat is less than 195 kJ/kg.
According to a further preferable technical scheme, the composite lightening material is formed by mixing 50-70 parts of closed perlite and 30-50 parts of secondary fly ash in parts by weight.
In a more preferred embodiment, the fluid loss agent is polyvinyl alcohol 1788.
As a further preferable technical scheme, the retarder is modified starch.
According to a further preferable technical scheme, the reinforcing agent material is formed by mixing 25-35 parts of sodium sulfate and 65-75 parts of aluminum sulfate in parts by weight.
The invention also provides a preparation method of the low hydration heat low density cement slurry system for well cementation, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of a composite lightening material, 2-3 parts of a fluid loss agent, 0-0.15 part of a retarder, 0-1.5 parts of a reinforcing agent and 70-85 parts of water;
s2, uniformly mixing the low-heat portland cement, the composite lightening material, the fluid loss agent, the retarder and the reinforcing agent weighed in the S1 at normal temperature to obtain mixed dry ash;
and S3, putting 70-85 parts of water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the low-hydration-heat low-density cement slurry system.
The invention further provides application of the low-hydration-heat low-density cement slurry system for well cementation, wherein the density of the low-hydration-heat low-density cement slurry system is 1.25-1.45g/cm 3 The method is suitable for oil-gas well cementing operation within the temperature range of 40-85 ℃.
As a further preferable technical scheme, under the condition of 40-55 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0-0.05 part of retarder, 0-0.5 part of reinforcing agent and 80 parts of water;
as a further preferable technical scheme, under the condition of 56-69 ℃, the low hydration heat and low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.05-0.15 part of retarder, 0.5-1.0 part of reinforcing agent and 80 parts of water;
as a further preferable technical scheme, under the condition of 70-85 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.10-0.15 part of retarder, 1.0-1.5 parts of reinforcing agent and 80 parts of water.
By adopting the technical scheme, the invention has the advantages that:
1. the high-strength low-hydration-heat low-density cement slurry system is suitable for cementing a long horizontal section horizontal well, can stabilize a production zone, can improve the setting strength, prevents water layers at the middle part and the upper part from invading and channeling, solves the problem that the long horizontal section horizontal well requires low-density cement slurry to prolong the thickening time but is difficult to improve the setting strength, and improves the technical level of a cementing low-density cement slurry system for better developing the long horizontal section horizontal well.
2. The invention adopts low hydration heat cement to replace G-grade oil well cement, reduces or does not use retarder, simultaneously reduces the addition of coagulant, does not increase or reduce the manufacturing cost of the system, simultaneously improves the performance of the system, solves the difficult problem of field construction, and has good popularization and application prospect.
3. The high-performance low-heat portland cement developed by the invention mainly breaks through the composition design of the traditional Portland Cement (PC) clinker with tricalcium silicate (C3S is more than or equal to 50%) as the leading mineral, and solves the problem of C in the preparation technology 2 The method has the advantages that the two problems of S activation and normal temperature stability are solved, the high-activity low-heat portland cement is directly prepared by adopting different rotary cement kilns at home and abroad for the first time, and the large-scale production of the low-heat portland cement is realized.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
It should be noted that: the examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. All starting materials mentioned in the following examples are obtained from published commercial sources unless otherwise specified.
In the present invention, the percentage (%) or parts means the mass percentage or parts by weight with respect to the composition, unless otherwise specified.
In order to overcome the defects of the existing well cementation low density system and improve the well cementation quality of oil and gas wells, the invention adopts the following technical means:
1. selecting a low-heat portland cement of appropriate composition:
based on the requirements of domestic and foreign standards on the composition and performance indexes of low-heat portland cement (see tables 1 and 2 respectively), the components of the low-heat portland cement are preferably selected by proportioning portland cement for different components and repeated experimental screening in a low-density system: c 3 The S content is 28-33%;
C 2 the content of S is 42-48%;
C 3 the content of A is not more than 3%;
C 4 the AF content is 15 to 17 percent;
the CaO content is 3-4%;
the balance being mixed mineral components.
Specifically, the mixed mineral component is MgO or SO 3 One or a mixture thereof; and the mass percentage content of the mixed mineral components is less than 5 percent.
C in the selected low-heat silicate cement component 2 S content of more than 42%, C 3 The content of S is less than 33 percent, C 3 The content of A is not more than 3 percent, the content of silicate minerals in a clinker mineral system is 75-80 percent, and the particle size of the low-heat portland cement is 2.0-150 mu m. The invention increases the C with slow heat release rate and high condensation strength 2 The S content achieves the aims of reducing hydration heat in the early stage, prolonging thickening time and increasing strength in the later stage.
TABLE 1 Standard requirements for chemical composition and mineral composition of low-heat portland cement or clinker
| Correlation criteria | MgO | SO 3 | C 3 S | C 2 S | C 3 A |
| ASTMC150-16 | ≤6.0％ | ≤2.3％ | ≤35％ | ≥40％ | ≤7％ |
| JISR5210-2009 | ≤5.0％ | ≤3.5％ | / | ≥40％ | ≤6％ |
| GB200-2003 | ≤6.0％ | ≤3.5％ | / | ≥40％ | ≤6％ |
Table 2 the standards of various countries have requirements on the indexes of the compression strength and the hydration heat performance of the low-heat cement
TABLE 3 comparison of hydration heat of selected low heat portland cements with other cements
| Varieties of cement | 3d hydrationHeat/kJ/kg | 7d Heat of hydration/kJ/kg | 28d Heat of hydration/kJ/kg |
| Low heat portland cement | 192 | 222 | 263 |
| G-grade oil well cement | 233 | 276 | 315 |
| Ordinary portland cement | 253 | 296 | 348 |
As can be seen from Table 3, the selected low heat portland cement has a lower heat release rate (3d heat of hydration less than 195/kJ/kg) than the grade G oil well cement (3d heat of hydration less than 233/kJ/kg).
In addition, the 28d strength of the low hydration heat Portland cement is equivalent to that of the general Portland cement, and the 90d later-age strength of the low hydration heat Portland cement is higher than that of the traditional Portland cement by more than 10 MPa. Therefore, the low hydration heat portland cement has the characteristics of slow hydration reaction, low hydration heat, high later-stage strength, good erosion resistance and the like, and ensures that the later-stage solidification strength meets the row standard requirements.
2. On the basis of the research results, the invention applies the selected low hydration heat portland cement (namely the low heat portland cement) to develop a low hydration heat low-density cement slurry system, and forms a novel low hydration heat well cementation low-density cement slurry system which can replace the existing low-density system by matching with a composite lightening material, a reinforcing agent and a retarder, and the cement slurry system comprises the following components in parts by weight:
according to a further preferable technical scheme, the composite lightening material is formed by mixing 50-70 parts by weight of closed perlite and 30-50 parts by weight of secondary fly ash.
In a more preferred embodiment, the fluid loss agent is polyvinyl alcohol 1788.
As a further preferable technical scheme, the retarder is modified starch.
In a more preferable embodiment, the reinforcing agent material is prepared by mixing 25 to 35 parts by weight of sodium sulfate and 65 to 75 parts by weight of aluminum sulfate.
As a further preferred technical scheme, the low hydration heat low density cement slurry system for well cementation comprises the following components in parts by weight:
3. on the basis of the research results, the invention further provides a preparation method of the low hydration heat low density cement slurry system for well cementation, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of a composite lightening material, 2-3 parts of a fluid loss agent, 0-0.15 part of a retarder, 0-1.5 parts of a reinforcing agent and 70-85 parts of water;
s2, uniformly mixing the low-heat portland cement, the composite lightening material, the fluid loss agent, the retarder and the reinforcing agent weighed in the S1 at normal temperature to obtain mixed dry ash;
and S3, putting 70-85 parts of water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the low-hydration-heat low-density cement slurry system.
As a further preferred technical solution there is provided,
4. on the basis of the research results, the invention further provides application of the low-hydration-heat low-density cement slurry system for well cementation, and the density of the low-hydration-heat low-density cement slurry system is 1.25-1.45g/cm 3 The method is suitable for oil-gas well cementing operation within the temperature range of 40-85 ℃.
As a further preferable technical scheme, under the condition of 40-55 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of a composite lightening material, 2.5 parts of a fluid loss agent, 0-0.05 part of a retarder, 0-0.5 part of a reinforcing agent and 80 parts of water;
as a further preferable technical scheme, under the condition of 56-69 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.05-0.10 part of retarder, 0.5-1.0 part of reinforcing agent and 80 parts of water;
as a further preferable technical scheme, under the condition of 70-85 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.10-0.15 part of retarder, 1.0-1.5 parts of reinforcing agent and 80 parts of water.
The present invention will be described in further detail with reference to examples and comparative examples.
Example 1:
the embodiment provides a low hydration heat low density cement slurry system for well cementation, which comprises the following components in percentage by weight:
the control group uses the same amount of high-resistance G-grade oil well cement to replace low-heat silicate cement, and the other components and the using amount are unchanged.
The experimental data of the low hydration heat low density cement slurry system for well cementation obtained in this example are shown in table 4 below:
TABLE 4 Density of 1.26g/cm 3 The experimental performance of the low hydration heat low density cement slurry system for well cementation
Example 2:
the embodiment provides a low hydration heat low density cement slurry system for well cementation, which comprises the following components in percentage by weight:
the control group uses the same amount of high-resistance G-grade oil well cement to replace low-heat silicate cement, and the other components and the using amount are unchanged.
The experimental data of the low hydration heat low density cement slurry system for well cementation obtained in this example are shown in table 5 below:
TABLE 5 Density of 1.31g/cm 3 The experimental performance of the low hydration heat low density cement slurry system for well cementation
Example 3:
the embodiment provides a low hydration heat low density cement slurry system for well cementation, which comprises the following components in percentage by weight:
the control group is formed by replacing low-heat silicate cement with the same amount of high-resistance G-grade oil well cement, and the other components and the using amount are unchanged.
The experimental data of the low hydration heat low density cement slurry system for well cementation obtained in this example are shown in table 6 below:
TABLE 6 Density of 1.37g/cm 3 The experimental performance of the low hydration heat low density cement slurry system for well cementation
Examples 1-3 are experimental performances of low hydration heat low density cement slurry systems for well cementation under different densities, and the data of the series comparison test show that: compared with a G-grade oil well cement system, the low-hydration-heat low-density cement slurry system for well cementation has the characteristics of good early-stage retardation and high stone forming strength under the condition that no retarder or coagulant is added.
Example 4:
the embodiment provides a low hydration heat low density cement slurry system for well cementation, which comprises the following components in percentage by weight:
the experimental performance of the low hydration heat low density cement slurry system for well cementation obtained in this example under different temperature conditions was tested, and the results are shown in table 7 below,
TABLE 7 Experimental Performance of Low hydration Heat Low Density Cement slurry System for well cementing at different temperatures
The data in the table show that the low hydration heat low density cement slurry system for well cementation prepared by using the low hydration heat cement (low heat portland cement) has a wider temperature application range, can meet the performance requirements of oil and gas well cementing construction on the low density system, not only reduces the formulation preparation difficulty, but also reduces the addition of the additive.
Example 5:
the embodiment provides a low hydration heat low density cement slurry system for well cementation, which comprises the following formula:
the rheological property test results of the low hydration heat low density cement slurry system for well cementation obtained in the embodiment are shown in the following table 8:
TABLE 8 rheological Properties of low hydration heat low density cement slurry system for well cementation (65 deg/30 min/atmospheric pressure)
| Rotational speed | 3 | 6 | 100 | 200 | 300 | 600 |
| Uplink is carried out | 8 | 11 | 37 | 59 | 88 | 129 |
| Downstream | 9 | 11 | 38 | 60 | 87 | 129 |
| Average | 8.5 | 11 | 37.5 | 59.5 | 87.5 | 129 |
Wherein the apparent viscosity is 64.5 centipoises, the plastic viscosity is 41 centipoises, n is 0.5596, and K is 13.64.
Control group:
the formula of the grade G cement is as follows:
the rheological property test results of the control group of class G cement are shown in the following table 9:
TABLE 9G class Cement rheology (65 deg/30 min/atmospheric pressure)
| Rotational speed | 3 | 6 | 100 | 200 | 300 | 600 |
| Uplink is carried out | 8 | 11 | 37 | 59 | 88 | 129 |
| Downstream | 9 | 11 | 38 | 60 | 87 | 129 |
| Average | 8.5 | 11 | 37.5 | 59.5 | 87.5 | 129 |
Wherein, the apparent viscosity is 54.5 centipoises, the plastic viscosity is 32 centipoises, n is 0.4917, K is 18.44.
In comparison with the above two sets of data, it is evident that: under the same condition, the low hydration heat low density cement slurry system for well cementation has higher viscosity than a low density system prepared by G-grade cement, and is more beneficial to the stability of the system.
The above series of experimental data shows that: the new low-density system formed by the low hydration heat low-density cement slurry system for well cementation and the G-level high-resistance cement has longer thickening time, higher 24/48h strength and better stability; under the condition of realizing the same performance, the using amount of the reinforcing agent and the retarder is not used or is greatly reduced; meanwhile, a large number of experiments for adjusting the system performance are reduced. The difficulty of formula adjustment of the existing well cementation low density system is reduced.
In conclusion, the invention uses the selected low-heat portland cement in combination with the composite lightening material, the reinforcing agent and the retarder to form a novel low-hydration-heat low-density cement slurry system for well cementation, which can replace the existing low-density system, and the performance of the system can reach the following indexes:
(1) the application range is as follows:
system density: 1.25-1.45g/cm 3
Application temperature: 40-85 DEG C
Thirdly, the strength requirement of the set cement is as follows: the normal pressure/45 ℃/24h/48h is more than 3.5MPa/7MPa (according with the performance of SY/T6544-2017 oil well cement slurry and the requirement on slurry leading).
Thickening time: adjustable according to construction scheme
(2) And (3) performance improvement:
firstly, under the condition of 40-55 ℃, the low hydration heat low density cement slurry system for well cementation does not need to depend on retarder for assistance, the thickening time can be prolonged by 60-80min compared with the thickening time using G-grade cement, the construction time requirement is basically met, no retarder or only a small amount of retarder is added, and more than 42 percent of C per se is added 2 Special for high later stage cementing strength of SThe system strength can meet the requirements of the industry standard on the collar slurry; only small amounts of reinforcing agents are required for strength differences.
Secondly, under the condition of 60-85 ℃, the thickening time of the low hydration heat low density cement slurry system for well cementation can be prolonged by 40-60min compared with the thickening time of a G-grade cement system, and because the bottom temperature of the contact is high, the reaction speed is accelerated, and C is added 2 S, the later-stage cementing strength is high, and the system strength can be higher than the requirement of an industrial standard; for wells with longer well depth and prolonged construction time, only a small amount of retarder needs to be added to prolong the thickening time of the system.
The strength of the set cement of the low hydration heat low density cement slurry system for well cementation prepared by using the low hydration heat portland cement is obviously higher than that of a low density system prepared by G-grade oil well cement under the conventional conditions (normal pressure/45 ℃/24h/48 h).
The density is 1.25-1.35g/cm 3 Compared with a G-grade system with the same density, the low hydration heat low density cement slurry system for well cementation has the strength increased by 15-20 percent;
the density is 1.35-1.45g/cm 3 Compared with a G-grade system with the same density, the low hydration heat low density cement slurry system for well cementation has the strength increased by 20-30 percent.
Therefore, the low hydration heat low density cement slurry system for well cementation has a wider temperature application range: 40-85 ℃, moderate density application range: 1.25-1.45g/cm 3 (ii) a Compared with a G-grade cement low-density system under the same condition, the high-strength concrete has longer thickening time (prolonged by 40-80min) and higher setting strength (improved by 15-30%) of 24/48 h. Meanwhile, the performance of a formula system is adjusted, a reasonable one-way adjustment space is reserved, the contradiction and the difficulty of simultaneous use of a retarder and an intensifier in an original system are solved, and the use amount of an additive is greatly reduced. The technology uses low hydration heat cement to replace the original G-grade oil well cement, both of which are essentially silicate cement, and the components are the same in type and different in proportion, and have good compatibility with other materials in well cementation. The manufacturing cost of the system is reduced, the performance of the system is improved, and the continuous progress of the technical level of the well cementation low-density cement slurry system is realized.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (6)
1. A low hydration heat low density cement slurry system for well cementation is characterized by comprising the following components in parts by weight:
60-70 parts of low-heat portland cement;
30-40 parts of composite lightening material;
2-3 parts of a fluid loss agent;
0-1.5 parts of a reinforcing agent;
0-0.15 part of retarder;
70-85 parts of water;
the low-heat portland cement comprises the following mineral components in percentage by mass: 28% -33% of tricalcium silicate; 42% -48% of dicalcium silicate; 0-3% of tricalcium aluminate; 15% -17% of tetracalcium aluminoferrite; 3-4% of calcium oxide; the balance being mixed mineral components; the particle size of the low-heat portland cement is 2.0-150 mu m, and the hydration heat with the heat release rate of 3d is less than 195 kJ/kg;
the composite lightening material is prepared by mixing 50-70 parts by weight of closed perlite and 30-50 parts by weight of secondary fly ash;
the fluid loss agent is polyvinyl alcohol 1788;
the retarder is modified starch;
the reinforcing agent is prepared by mixing 25-35 parts by weight of sodium sulfate and 65-75 parts by weight of aluminum sulfate.
2. A low hydration heat low density cement slurry system for well cementation as claimed in claim 1 wherein: the mass percentage content of the mixed mineral component is less than 5 percent.
3. The method as recited in claim 1A low hydration heat low density cement slurry system for well cementation is characterized in that: the mixed mineral component is MgO or SO 3 Or a mixture thereof.
4. A method of preparing a low hydration heat low density cement slurry system for well cementation as claimed in claim 1, comprising the steps of:
s1, weighing the following raw materials in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2-3 parts of fluid loss additive, 0-0.15 part of retarder, 0-1.5 parts of reinforcing agent and 70-85 parts of water;
s2, uniformly mixing the low-heat portland cement, the composite lightening material, the fluid loss agent, the retarder and the reinforcing agent weighed in the step S1 at normal temperature to obtain mixed dry ash;
and S3, pouring 70-85 parts of water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the low-hydration-heat-content low-density cement slurry system.
5. The application of the low-hydration-heat low-density cement slurry system for well cementation according to claim 1, wherein the density of the low-hydration-heat low-density cement slurry system is 1.25-1.45g/cm 3 The method is suitable for oil-gas well cementing operation within the temperature range of 40-85 ℃.
6. The use of a low hydration heat low density cement slurry system for well cementation according to claim 5,
under the condition of 40-55 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0-0.05 part of retarder, 0-0.5 part of reinforcing agent and 75-85 parts of water;
under the condition of 56-69 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.05-0.15 part of retarder, 0.5-1.0 part of reinforcing agent and 75-85 parts of water;
under the condition of 70-85 ℃, the low hydration heat low density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat portland cement, 30-40 parts of composite lightening material, 2.5 parts of fluid loss additive, 0.10-0.15 part of retarder, 0.5-1.5 parts of reinforcing agent and 75-85 parts of water.
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| CN103145353A (en) * | 2013-03-12 | 2013-06-12 | 中国长江三峡集团公司 | Low-heat anti-cracking portland cement |
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