CN112094060A - High-temperature well cementation cement and preparation method and application thereof - Google Patents
High-temperature well cementation cement and preparation method and application thereof Download PDFInfo
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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
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B7/36—Manufacture of hydraulic cements in general
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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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
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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
Abstract
The invention relates to high-temperature well cementation cement and a preparation method and application thereof, wherein the high-temperature well cementation cement comprises the following raw materials in percentage by mass: 69-72% of cement raw materials; 28-31% of quartz sand; the cement raw material consists of G-grade oil well cement and nuclear power cement in a mass ratio of 4:6-5: 5. The cementing cement has long thickening time and stability, and the strength is basically not reduced along with the temperature rise, so the cementing cement is particularly suitable for the cementing engineering in Africa regions.
Description
Technical Field
The invention belongs to the technical field of cement, and particularly relates to high-temperature well cementation cement and a preparation method and application thereof.
Background
Well cementation is the premise and the foundation of safe, economic and efficient development of oil and gas resources and is also a key link of oil and gas well construction engineering, and the well cementation is to inject cement slurry into the annular space between a casing and a stratum to pack and isolate complex strata which are easy to collapse and leak and the like, pack an oil and gas water layer, establish an oil and gas outflow channel, prevent the mutual channeling between production layers, protect the casing and the like. Therefore, the quality of well cementation directly influences the exploitation safety, the production life and the economic benefit of the oil and gas well.
The G-grade oil well cement is a common high-temperature well cementing material, but has the problem of short-term cement strength decline in part of high-temperature stratums such as service, because the African countries have relatively low topography, temperature and humidity and heat, the climate is not suitable for the high-temperature well cementing of the G-grade oil well cement, and when the G-grade oil well cement is applied to the environment with the temperature of more than 180 ℃, the G-grade oil well cement has the phenomena of slow development of sedimentation stability and compressive strength, even super retardation, and is easy to cause the decline of the compressive strength of the cement, and further has the technical problems of gas channeling and the like. In the prior art, the strength decay phenomenon of oil well cement at high temperature is effectively inhibited by adding quartz sand into G-grade oil well cement, but the thickening time is sometimes too short, the strength is sometimes too low, and the free liquid is too high, so that the recovery ratio of the oil and gas well is influenced.
Disclosure of Invention
In view of the above, the present invention aims to provide a high temperature cementing cement, a preparation method and an application thereof, which can solve the problems of short thickening time and low later strength in a high temperature formation.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The high-temperature well cementation cement provided by the invention comprises the following raw materials in percentage by mass:
69-72% of cement raw materials;
28-31% of quartz sand;
the cement raw material consists of G-grade oil well cement and nuclear power cement in a mass ratio of 4:6-5: 5.
Preferably, in the high-temperature well cementing cement, the grade G oil well cement contains the following raw materials in percentage by mass:
95-97 wt% of silicate cement clinker;
3-5 wt% of gypsum;
the portland cement clinker contains 48-65 wt% of C3S and 0.5-2.5 wt% of C3A.
Preferably, the high-temperature well cementing cement comprises 55 wt% of C3S and 1.5 wt% of C3A based on the mass of the G-class oil well cement.
Preferably, in the high-temperature well cementing cement, the Portland cement clinker further comprises 0.3 wt% to 0.6 wt% of R based on the mass of the G-class oil well cement2O, 15-21 wt% of C2S and 15% -20% of C4AF。
Preferably, in the high-temperature well cementation cement, the Portland cement clinker further contains 0.47 wt% of R based on the mass of the G-class oil well cement2O, 20.16 wt% of C2S and 17.08 wt% of C4AF。
Preferably, in the high temperature well cementation cement as described above, the gypsum is selected from natural dihydrate gypsum, anhydrite and mixed gypsum.
Preferably, in the high-temperature well cementing cement, the thickening time of the G-grade oil well cement is 95-115min, and the particle density is 3.18 +/-0.01G/cm3The specific surface area is 350-380m2/kg。
Preferably, in the high-temperature well cementation cement, the nuclear power cement comprises the following raw materials in percentage by mass:
moderate heat portland cement clinker: 95-97 wt%;
3-5 wt% of gypsum;
the moderate heat portland cement clinker contains 42-51 wt% of C3S and 0.5-1.5 wt% of C3A。
Preferably, in the high-temperature well cementation cement, the moderate heat portland cement clinker contains 46 wt% of C based on the mass of the nuclear power cement3S and 0.8 wt% of C3A。
Preferably, in the high-temperature well cementation cement, the portland cement clinker further contains 0.3 wt% to 0.6 wt% of R based on the mass of the nuclear power cement2O, 25-34 wt% of C2S and 12-16 wt% of C4AF。
Preferably, in the high-temperature well cementation cement, the portland cement clinker further contains 0.47 wt% of R based on the mass of the nuclear power cement2O, 29.44 wt% of C2S and 14.20 wt% of C4AF。
Preferably, in the high temperature well cementation cement, the gypsum is selected from one of natural dihydrate gypsum, anhydrite and mixed gypsum.
Preferably, in the high-temperature well cementing cement, the quartz sand contains SiO in an amount of not less than 96 wt%2。
Preferably, in the high-temperature well cementing cement, the water content of the quartz sand is less than 0.3%.
Preferably, in the high-temperature well cementation cement, the fineness of the quartz sand is 45 to 80 microns.
The purpose of the invention and the technical problem to be solved can be realized by adopting the following technical scheme. The preparation method of the high-temperature well cementation cement provided by the invention comprises the following steps:
a, mixing and grinding the silicate cement clinker and the gypsum according to the formula ratio until the specific surface area is more than or equal to 360m2Obtaining G-grade oil well cement;
b mixing the moderate heat silicate water with the formula amountThe clinker and the gypsum are mixed and ground until the specific surface area is more than or equal to 360m2Obtaining nuclear power cement in kg;
and c, uniformly mixing the G-grade oil well cement obtained in the step a, the nuclear power cement obtained in the step b and quartz sand according to the formula amount to obtain the high-temperature well cementation cement.
The purpose of the invention and the technical problem to be solved can be realized by adopting the following technical scheme. According to the high-temperature well cementation cement slurry provided by the invention, the high-temperature well cementation cement slurry comprises the following components in parts by weight: 65-75 parts of high-temperature cement, 0.8-1.2 parts of fluid loss additive, 0.8-1.2 parts of defoaming agent and 25-32 parts of water.
Preferably, in the high-temperature well cementing cement slurry, the high-temperature well cementing cement slurry comprises, by weight: 69 parts of high-temperature cement, 1 part of fluid loss additive, 1 part of defoaming agent and 29 parts of water.
Preferably, in the high-temperature well cementing cement slurry, the high-temperature cement is the high-temperature well cementing cement.
Preferably, in the high-temperature well cementing cement slurry, the fluid loss agent is at least one selected from the group consisting of a quaternary polymer copolymer, polyvinyl alcohol and an acrylamide methyl propane sulfonic acid copolymer.
The defoaming agent is at least one selected from n-octanol, emulsified silicone oil, higher alcohol, dimethicone and tributyl phosphate, and is more preferably n-octanol. Wherein, the higher alcohol is also called higher alkanol, and refers to saturated monohydric alcohol of waxy solid with more than twelve carbon atoms.
The purpose of the invention and the technical problem to be solved can be realized by adopting the following technical scheme. The preparation method of the high-temperature well cementation cement slurry provided by the invention comprises the following steps:
adding water into the high-temperature cement according to the formula amount, uniformly stirring, sequentially adding the fluid loss agent and the defoaming agent according to the formula amount, and continuously and uniformly stirring.
The purpose of the invention and the technical problem to be solved can be realized by adopting the following technical scheme. According to the high-temperature well cementation structure provided by the invention, the high-temperature well cementation structure comprises a casing and a stratum, and the high-temperature well cementation cement slurry is injected into an annular space between the casing and the stratum. The high-temperature well cementation cement slurry can play a role in packing complex strata which are easy to collapse, leak and the like.
The purpose of the invention and the technical problem to be solved can be realized by adopting the following technical scheme. The invention provides a well cementation method, which comprises the following steps:
and (3) running a casing into the well, and injecting the high-temperature well cementation cement slurry into an annular space between the well hole and the casing.
Compared with the prior art, the high-temperature well cementation cement and the preparation method and the application thereof have the following beneficial effects:
1. the high-temperature well cementation cement disclosed by the invention has the advantages that the hydration process of the cement can better meet the high-temperature well cementation requirement by adjusting the type and content of the cement raw materials, the well cementation cement can effectively solve the problem of the decline of the high-temperature strength of cement stones in the deep well ultra-deep well cementation project, the preparation method is simple and easy to obtain, the existing high-temperature well cementation cement and a well cementation cement slurry system can be replaced, and the structural durability and the safety of the high-temperature complex deep well cementation project are facilitated.
2. The high-temperature well cementing cement has longer thickening time and stability, and the strength is basically not reduced along with the temperature rise, so the high-temperature well cementing cement is particularly suitable for the well cementing engineering in African regions.
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 a high temperature well cement and its preparation method and its application, features and effects in accordance with the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features or characteristics of one or more embodiments may be combined in any suitable manner.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
The following materials or reagents are all commercially available unless otherwise specified.
The invention provides high-temperature well cementation cement which comprises the following raw materials in percentage by mass: 69-72% of cement raw materials; 28-31% of quartz sand; the cement raw material comprises G-grade oil well cement and nuclear power cement in a mass ratio of 4:6-5:5, and the technical indexes are shown in table 1.
TABLE 1 technical indices of high-temperature well cementing cement
In specific implementation, the G-grade oil well cement is high-sulfur-resistance G-grade portland oil well cement, adopts silicate clinker with slightly high C3S, and has stable quality and excellent performance. The nuclear power cement is P.I 42.5 nuclear power cement, Portland clinker with a lower C3S content and a higher C2S content is adopted, the consistency and the thickening time (about 140 min) are tested according to an oil well cement test method, various indexes such as chemical components, mineral composition and the like completely meet the standard requirements of the oil well cement, and the later strength is slowly attenuated due to the higher C2S content. Tests show that the problems of short thickening time and low later strength are well solved by jointly preparing the G-grade oil well cement and the P.I 42.5 nuclear power cement and then mixing the G-grade oil well cement and the P.I 42.5 nuclear power cement with silica sand. The proportion of the two cements is controlled between 4:6 and 5:5 along with the quality fluctuation of the two cements. The preferable proportion is 5: and 5, after the optimization, the high-temperature well cementation cement has longer thickening time and higher strength, basically does not decline along with the rise of temperature when used for high-temperature well cementation, and meets the quality requirement.
In specific implementation, the G-grade oil well cement comprises the following raw materials in percentage by mass: 95-97 wt% of silicate cement clinker; 3-5 wt% of gypsum; the portland cement clinker contains 48-65 wt% of C3S and 0.5-2.5 wt% of C3A; preferred tool thereofThe body composition is shown in tables 2-3; preferably, the portland cement clinker contains 55 wt% of C3S and 1.5 wt% of C3A, so that the finally prepared well cementation cement has higher strength and meets the quality requirement; in addition, 0.3 to 0.6 weight percent of R is also contained2O, 15-21 wt% of C2S and 15% -20% of C4AF, preferably, the Portland cement clinker also contains 0.47 wt% of R, based on the mass of the G-grade oil-well cement2O, 20.16 wt% of C2S and 17.08 wt% of C4AF, which preferably then helps to work synergistically with the remaining components to make the cement stronger. The thickening time of the G-grade oil well cement is 95-115min, and the particle density is 3.18 +/-0.01G/cm3The specific surface area is 350-380m2In terms of/kg. The nuclear power cement comprises the following raw materials in percentage by mass: moderate heat portland cement clinker: 95-97 wt%; 3-5 wt% of gypsum; the portland cement clinker contains 42-51 wt% of C3S and 0.5-1.5 wt% of C3A; preferred specific compositions thereof are shown in tables 2 to 3; preferably, the portland cement clinker contains 46 wt% of C3S and 0.8 wt% of C3A, so that the thickening time is preferably prolonged, the thickening time of the finally prepared cementing cement is stable, and the thickening time and the strength meet the quality requirements; also contains 0.3 to 0.6 weight percent of R2O, 25-34 wt% of C2S and 12-16 wt% of C4AF; preferably, the Portland cement clinker also contains 0.47 wt% of R based on the mass of the nuclear power cement2O, 29.44 wt% of C2S and 14.20 wt% of C4AF, which preferably later helps to work synergistically with the remaining components to stabilize the thickening time of the cement.
Chemical composition analysis wt% of G-grade oil well cement and nuclear power cement used in Table 2
The mineral composition in wt% of clinker of the G-grade oil-well cement and nuclear power cement used in Table 3
Wherein, in Table 2, there is trace amount of Ti, and Mn is not detected; the data in table 3 are derived from the data in table 2 according to conventional formulas in the art.
In particular, the gypsum is selected from the group consisting of natural dihydrate gypsum, anhydrite and mixed gypsum, preferably natural dihydrate gypsum, which preferably facilitates an extended thickening time so that it meets quality requirements.
Quartz sand is a key material for producing the high-temperature well cementation cement, and important quality targets such as purity, fineness, moisture and the like of the quartz sand are controlled well. Purity, useful component of which is SiO2The content thereof is usually not less than 96% by weight. The higher the fineness of the quartz sand is, the smaller the particle size of the quartz sand is, the faster the strength of the cement stone is developed secondarily in a high-temperature environment, and the stronger the high-temperature recession prevention capability of the cement stone is. The quartz sand with small grain size is more beneficial to the development of reaction equilibrium towards the formation of low-calcium silicate, thereby improving the strength of the set cement at high temperature. The fineness of the quartz sand is generally 8-35% of the residue screened by a standard sieve of 80 microns; the water content of the quartz sand is controlled within 0.3 percent.
The invention also provides a preparation method of the high-temperature well cementation cement, which comprises the following steps:
a, mixing and grinding the silicate cement clinker and the gypsum according to the formula ratio until the specific surface area is more than or equal to 360m2Obtaining G-grade oil well cement;
b, mixing and grinding moderate heat portland cement clinker and gypsum according to the formula ratio until the specific surface area is more than or equal to 360m2Obtaining nuclear power cement in kg;
and c, uniformly mixing the G-grade oil well cement obtained in the step a, the nuclear power cement obtained in the step b and quartz sand according to the formula amount to obtain the high-temperature well cementation cement.
The invention also provides high-temperature well cementation cement slurry, which comprises the following components in parts by weight: 65-75 parts of high-temperature well cementing cement, 0.8-1.2 parts of fluid loss additive, 0.8-1.2 parts of defoaming agent and 25-32 parts of water. Preferably, the high-temperature well cementation cement slurry comprises the following components in parts by weight: 69 parts of high-temperature cement, 1 part of fluid loss additive, 1 part of defoaming agent and 29 parts of water, so that the optimization is facilitated.
In specific implementation, the fluid loss agent is selected from at least one of a quaternary polymer copolymer, polyvinyl alcohol and an acrylamide-based methylpropanesulfonic acid copolymer; the fluid loss agent can form a layer of compact film between a filter medium and a filter cake, and prevents water in cement slurry from flowing to a stratum. The defoaming agent is at least one selected from n-octanol, emulsified silicone oil, higher alcohol, dimethicone and tributyl phosphate, and is more preferably n-octanol. Wherein, the higher alcohol is also called higher alkanol, and refers to saturated monohydric alcohol of waxy solid with more than twelve carbon atoms. Therefore, the foam can be better prevented from generating after optimization, and the influence of the air bubbles in the cement stone on the strength performance of the cement material can be effectively inhibited.
The invention also provides a preparation method of the high-temperature well cementation cement slurry, which comprises the following steps:
adding water into the high-temperature cement according to the formula amount, uniformly stirring, sequentially adding the fluid loss agent and the defoaming agent according to the formula amount, and continuously and uniformly stirring.
The invention also provides a high-temperature well cementing structure, wherein the high-temperature well cementing structure comprises a casing and a stratum, and the annular space between the casing and the stratum is injected with the high-temperature well cementing cement slurry. The high-temperature well cementation cement slurry can play a role in packing complex strata which are easy to collapse, leak and the like, and also can play a role in fixing and protecting a casing and protecting a high-pressure oil-gas layer.
The invention also provides a well cementation method, which comprises the following steps:
and (3) running a casing into the well, and injecting the high-temperature well cementation cement slurry into an annular space between the well hole and the casing. The main purpose of cementing is to protect and support the casing in the oil and gas well, and to seal off oil, gas and water formations.
In addition, a certain amount of pad fluid is pumped in before the grout is injected into the casing to isolate the drilling fluid from the grout to avoid mixing. And after the spacer fluid returns out of the sleeve, the annular space is cleaned.
Table 3 shows the performance test table of the high-temperature well-cementing cement prepared in examples 1-3 of the present invention, wherein the concrete compositions of the G-grade oil-well cement and the nuclear power cement are shown in Table 2; the fineness of the quartz sand is 15% of the screen residue screened by a standard sieve of 80 microns. The water content of the silica sand was 0.1%. The following percentages are mass percentages.
TABLE 3
As can be seen from table 3, when the G-grade oil well cement and the nuclear power cement in the cement raw materials are mixed in a ratio of 50% to 50% and then the quartz sand is added, the mass percentage of the cement raw materials ranges from 69% to 72%, and the mass percentage of the quartz sand ranges from 28% to 31%, and all properties of the prepared high-temperature well cementation cement meet the quality requirements, wherein when the mass percentage of the cement raw materials is 70%, and the mass percentage of the quartz sand is 30%, the properties are the best, that is, the thickening time of the high-temperature well cementation cement prepared in example 2 is higher under the premise of meeting the quality requirements.
Table 4 shows the performance test table of the high-temperature well-cementing cement prepared in examples 4-6 of the present invention, wherein the concrete compositions of the G-grade oil-well cement and the nuclear power cement are shown in Table 2; the fineness of the quartz sand is 15% of the screen residue screened by a standard sieve of 80 microns. The water content of the silica sand was 0.1%. The following percentages are mass percentages.
TABLE 4
As can be seen from Table 4, when the G-grade oil well cement and the nuclear power cement in the cement raw materials are mixed in a ratio of 40% to 60% and then added with the quartz sand, the mass percent of the cement raw materials ranges from 69% to 72%, and the mass percent of the quartz sand ranges from 28% to 31%, all properties of the prepared high-temperature well cementation cement meet the quality requirements, but the thickening time is slightly shorter than that of the G-grade oil well cement and the nuclear power cement in the ratio of 50% to 50% in Table 3; when the mass percent of the cement raw material is 70% and the mass percent of the quartz sand is 30%, the performances are optimal, namely the thickening time of the high-temperature well cementation cement prepared in the embodiment 5 is higher in strength on the premise of meeting the quality requirement.
Table 5 shows the performance test tables of the high temperature well cementation cements prepared in examples 7-9 of the present invention, wherein the specific compositions of the G-grade oil well cement and the nuclear power cement are shown in Table 2; the fineness of the quartz sand is 15% of the screen residue screened by a standard sieve of 80 microns. The water content of the silica sand was 0.1%. The following percentages are mass percentages.
TABLE 5
As can be seen from Table 5, when the G-grade oil well cement and the nuclear power cement in the cement raw materials are mixed in a ratio of 60% to 40% and then added with the quartz sand, the mass percent of the cement raw materials ranges from 69% to 72%, and the mass percent of the quartz sand ranges from 28% to 31%, all properties of the prepared high-temperature well cementation cement meet the quality requirements, but the cement thickening time is longer than that of the G-grade oil well cement and the nuclear power cement in a ratio of 50% to 50% in Table 3; when the mass percent of the cement raw material is 70% and the mass percent of the quartz sand is 30%, the performances are optimal, namely the thickening time of the high-temperature well cementation cement prepared in the embodiment 8 is higher in strength on the premise of meeting the quality requirement.
Table 6 shows the performance test table of the high-temperature well cementation cement prepared in the embodiments 10 to 12 of the present invention, wherein the mass percentage of the G-grade oil well cement and the nuclear power cement is 50%: 50 percent; the mass percentage of the mixture of the G-grade oil well cement and the nuclear power cement (cement raw material) to the quartz sand is 70%: 30 percent; the concrete compositions of the G-grade oil well cement and the nuclear power cement are shown in Table 2; the water content of the silica sand was 0.1%. The following percentages are mass percentages.
TABLE 6
Combining the data of example 2 and table 6 of table 1, it can be seen that the mass percentage of the grade G oil well cement and nuclear power cement is 50%: 50 percent; the mass percentage of the mixture of the G-grade oil well cement and the nuclear power cement (cement raw material) to the quartz sand is 70%: 30%, when the fineness of the quartz sand is less than or greater than 15% of the screen residue content screened by the standard screen of 80 microns, the performance of the prepared high-temperature well-cementing cement is inferior to that of the cement with the screen residue content of 15% under the same condition, which shows that when the fineness of the quartz sand is 15% of the screen residue content screened by the standard screen of 80 microns, namely the thickening time of the high-temperature well-cementing cement prepared in example 2 is higher on the premise of meeting the quality requirement.
Table 7 is a performance test table of the high temperature well cementation cement prepared in comparative examples 1 to 3 of the present invention, wherein the concrete composition of the G-grade oil well cement is shown in Table 2; the fineness of the quartz sand is 15% of the screen residue screened by a standard sieve of 80 microns. The following percentages are mass percentages.
TABLE 7
As can be seen from the data in Table 7, the G-grade well cement has unstable thickening time with the addition of quartz sand, sometimes fails to meet the index requirements, and has too low strength and too high free liquid.
Table 8 is a table of strength decay test of the well cementation cement and the G-grade oil well cement prepared in example 2 of the present invention at different curing temperatures, wherein the following percentages are mass percentages.
TABLE 8
As can be seen from the data in Table 8, the strength of the cement for well cementation of example 2 increases with increasing temperature in the range of 60 ℃ to 130 ℃ followed by a slight decrease in strength in the range of 130 ℃ to 200 ℃ with curing under the same conditions, which indicates that the cement for well cementation described in example 2 declines very slowly or does not substantially decline with increasing temperature. The strength of the G-grade oil well cement and the well cementation cement of the comparative example 1 is more seriously degraded along with the rise of the temperature, and the degradation of the strength is not linear but is accelerated in a geometric mode. The reason is probably that after the temperature is increased, the synergistic effect of G-grade oil well cement, nuclear power cement and quartz sand in the well cementation cement enables the product to be converted to low-calcium silicate, and the strength decline of the cement in the middle and later periods is favorably inhibited. In the G-grade oil well cement and the well cementation cement of the comparative example 1, the cement hydration reaction is accelerated by the increased temperature, C2SH2 generated by the hydration of C2S and C3S is unstable at high temperature and undergoes crystal form transformation to form a mixture phase taking C2SH (C) and C2SH (A) as main bodies, the two hydration products have low strength, and in addition, the crystal form transformation of the two hydration products in a solid state destroys the internal structure of the cement, so that the strength of the cement is sharply reduced at high temperature.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some embodiments, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
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 (12)
1. The high-temperature well cementation cement is characterized by comprising the following raw materials in percentage by mass:
69-72% of cement raw materials;
28-31% of quartz sand;
the cement raw material consists of G-grade oil well cement and nuclear power cement in a mass ratio of 4:6-5: 5.
2. The high-temperature well cementation cement of claim 1, wherein the G-grade oil well cement comprises the following raw materials in percentage by mass:
95-97 wt% of silicate cement clinker;
3-5 wt% of gypsum;
the portland cement clinker contains 51-65 wt% of C3S and 0.5-2.5 wt% of C3A.
3. The high temperature cementing cement of claim 2, wherein said portland cement clinker comprises 55 wt% C3S and 1.5 wt% C3A; the gypsum is selected from one of natural dihydrate gypsum, anhydrite and mixed gypsum; the thickening time of the G-grade oil well cement is 95-115min, and the particle density is 3.18 +/-0.01G/cm3The specific surface area is 350-380m2/kg。
4. The high-temperature well cementation cement of claim 1, wherein the nuclear power cement comprises the following raw materials by mass percent:
95-97 wt% of moderate heat portland cement clinker;
3-5 wt% of gypsum;
the moderate heat portland cement clinker contains 42-50 wt% of C3S and 0.5-1.5 wt% of C3A.
5. The high temperature cement of claim 4, wherein the moderate heat portland cement clinker comprises, by mass of the nuclear power cement, 46% C3S and 0.8% C3A; the gypsum is selected from one of natural dihydrate gypsum, anhydrite and mixed gypsum.
6. The high temperature cement of claim 1, wherein the silica sand contains not less than 96 wt% SiO2(ii) a The moisture content of the quartz sand is less than 0.3%; the fineness of the quartz sand is 8-35% of the residue screened by a standard sieve of 80 microns.
7. A method for preparing a high temperature cement according to claims 1-6, characterized in that it comprises the following steps:
a, mixing and grinding the silicate cement clinker and the gypsum according to the formula ratio until the specific surface area is more than or equal to 360m2Obtaining G-grade oil well cement;
b, mixing and grinding moderate heat portland cement clinker and gypsum according to the formula ratio until the specific surface area is more than or equal to 360m2Obtaining nuclear power cement in kg;
and c, uniformly mixing the G-grade oil well cement obtained in the step a, the nuclear power cement obtained in the step b and quartz sand according to the formula amount to obtain the high-temperature well cementation cement.
8. The high-temperature well cementation cement slurry is characterized by comprising the following components in parts by weight: 65-75 parts of high-temperature cement, 0.8-1.2 parts of fluid loss additive, 0.8-1.2 parts of defoaming agent and 25-32 parts of water according to claims 1-7.
9. The high temperature well cementation cement slurry of claim 8, wherein the fluid loss additive is selected from at least one of a quaternary polymer copolymer, polyvinyl alcohol and an acrylamide methyl propane sulfonic acid copolymer; the defoaming agent is at least one selected from n-octanol, emulsified silicone oil, higher alcohol, dimethyl silicone oil and tributyl phosphate.
10. A method for preparing a high temperature cementing slurry according to claim 8 or 9, characterized by comprising the following steps:
adding water into the high-temperature cement according to the formula amount, uniformly stirring, sequentially adding the fluid loss agent and the defoaming agent according to the formula amount, and continuously and uniformly stirring.
11. A high temperature cementing structure comprising a casing and a formation, wherein the annular space between the casing and the formation is filled with the high temperature cementing slurry of claim 8 or 9.
12. A well cementation method is characterized by comprising the following steps: running casing into the well and injecting a high temperature cementing cement slurry according to claim 8 or 9 into the annular space between the wellbore and the casing.
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