CN116947362A - Low-temperature expansion agent for well cementation cement paste and preparation method thereof - Google Patents
Low-temperature expansion agent for well cementation cement paste and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 129
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 81
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 36
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 32
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 28
- 239000010440 gypsum Substances 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 23
- 230000008961 swelling Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 9
- 235000011152 sodium sulphate Nutrition 0.000 claims description 9
- 125000000129 anionic group Chemical group 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 239000003129 oil well Substances 0.000 abstract description 9
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 21
- 239000004575 stone Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 15
- 238000006703 hydration reaction Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000036571 hydration Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000035699 permeability Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- -1 silicon-aluminum compound Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to the technical field of oil gas exploitation well cementation cement paste, and particularly relates to a low-temperature expanding agent for well cementation cement paste and a preparation method thereof. The invention discloses a low-temperature expanding agent for well cementation cement paste, which comprises the following components in parts by weight: 25-35 parts of gypsum, 5-10 parts of anhydrous sodium sulfate, 20-30 parts of expansion clinker and 40-50 parts of polyacrylamide. The low-temperature expansion agent is compounded and synergistic by the gypsum, the anhydrous sodium sulfate, the expansion clinker and the polyacrylamide, so that the cement can realize larger expansion amount under the low-temperature condition without affecting the basic performance of the oil well cement paste, the cementing strength of the cement is improved, and the low-temperature expansion agent has good applicability as a whole.
Description
Technical Field
The invention belongs to the technical field of oil gas exploitation well cementation cement paste, and particularly relates to a low-temperature expanding agent for well cementation cement paste and a preparation method thereof.
Background
Cementing is an important link in the development process of oil and gas wells, and the cementing process is to inject cement slurry from a sleeve to the well wall and the annular space of the sleeve and return the cement slurry to a certain height, and then the cement slurry becomes cement stone to solidify the well wall and the sleeve. The well cementation operation is performed by cementing, the annular gap between the casing and the well hole is filled with oil well cement, and the oil well cement plays roles of supporting the casing, protecting the oil-gas layer, sealing the leakage layer and the like after solidification. The quality of well cementation is directly related to the quality of various operations such as continuous drilling of an oil-gas well and subsequent well completion, oil extraction, well repair and the like.
However, the existing well cementation cement slurry system inevitably has the phenomenon of volume shrinkage in the curing and hardening stages, the cementing quality of a cement sheath cannot be ensured due to the volume shrinkage, and micro gaps can be formed by cracking in severe cases, so that formation fluid (oil, water and gas) channeling is initiated, and particularly, the problems of hydration reaction and condensation of the cement slurry are low in the low-temperature well cementation (working condition temperature is 10-60 ℃) environment of shallow oil and gas resources and the like, the channeling problem is more serious, and the normal production of oil and gas in the later stage of an oil well and the implementation of yield increasing measures are seriously influenced.
In order to solve the problems, an expanding agent is often added into cement slurry in the well cementation construction to play a role in compensating cement shrinkage, preventing cracking and fully filling cement gaps. However, expanding agents currently commercially available (e.g., na 2 SO 4 、NaCl、CaSO 4 、CaSO 4 .0.5H 2 O, metallic oxygenCaO+ MgO, caO, mgO, caO +Al compound 2 O 3 The cement paste has the advantages that the cement paste has low strength at the early stage of hydration reaction of cement paste with concentrated expansion amount, the early expansion is easily consumed by plastic deformation in the hydration process, the later expansion rate shows a reduction or even shrinkage trend, the cracking risk is increased, and the requirements on the construction requirement of the well cementing cement paste and the low-temperature expansion performance of the expanding agent under the low-temperature well cementation condition can not be effectively met. In addition, the expansion amount and the compressive strength of the cement stone usually belong to a mutually restricted relation, and as the expansion amount increases, the density of the cement stone decreases, and the compressive strength also decreases, so that a contradiction exists between the expansion rate and the compressive strength frequently.
For example, for low temperature well cementation environment, chinese patent application publication No. CN101328050A discloses a low temperature low hydration thermosetting well cement system which is composed of 20-60% of G-grade oil well cement, 20-40% of superfine slag, 13-36% of fly ash, 3-7% of gypsum and trace external admixture. The technology ensures that the cement stone has certain expansion performance at low temperature by adding a certain amount of gypsum component, and prevents the cement stone from shrinking at low temperature. However, gypsum single component adopted in oil well cement has weak expansion effect (expansion rate is 0.21%) at low temperature, but thixotropic property of the added slurry is increased, cement slurry is thickened, well cementation risk is increased, meanwhile, compressive strength improvement effect of cement stone is not obvious (compressive strength is 5.51-6.99 MPa), and higher application requirements of low-temperature well cementation cement on expansion amount and compressive strength cannot be met, so that the application effect is poor.
Disclosure of Invention
The invention aims to provide a low-temperature expanding agent for well cementation cement paste, which has excellent expansion performance in a cement paste system in a low-temperature range and can effectively ensure the compressive strength of cement stones.
The invention also provides a preparation method of the low-temperature expansion agent for the well cementation cement paste.
In order to achieve the above purpose, the technical scheme of the low-temperature expanding agent for the well cementation cement slurry is as follows:
the low-temperature expanding agent for the well cementation cement paste consists of the following components in parts by weight: 25-35 parts of gypsum, 5-10 parts of anhydrous sodium sulfate, 20-30 parts of expansion clinker and 40-50 parts of polyacrylamide.
According to the low-temperature expansion agent for the well cementation cement paste, the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are compounded to perform synergistic effect, so that the cement paste can realize larger expansion amount under the low-temperature condition without affecting the basic performance of the oil well cement paste, the cement paste cementing strength is improved, and the low-temperature expansion agent has good applicability as a whole.
According to the technical scheme, when the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are used as the expansion agent of the well cementation cement slurry, a stable azeotropic mixture is formed by the four materials and the silicon-aluminum compound of the cement slurry, and early shrinkage of the cement stone is restrained by the competitive interaction effect of the formation reaction of the hydrate form and the limited water supply from the azeotropic mixture.
Meanwhile, the active component in the expanding agent reacts with the cement hydration product to generate a crystal growth pressure in a limited space, and the size of the crystal increases with the extension of the reaction time, thereby generating volume expansion. The cement stone can realize larger expansion amount under the condition of low temperature by adding the expansion clinker; the polyacrylamide material is matched with other expansion materials, so that the interfacial cementing strength of the cement sheath and the casing and stratum is enhanced. Meanwhile, the ettringite (sulfate radical of the expansion clinker and aluminate of the hardened cement body are formed in aluminate solid phase) of the active expansion component of the expanding agent can be increased to the internal pore space of the cement stone while generating volume expansion, so that the porosity and permeability of the cement stone are reduced, and the corrosion resistance and compressive strength of the cement stone are improved.
In addition, the swelling agent can improve the cementation of the low-temperature swelling agent at the second interface of the cement slurry system by controlling the reactivity of the swelling material, so that the swelling of the low-temperature swelling agent mostly occurs in the later stage of hydration (after solidification). In the process, polyacrylamide with different molecular weights is mainly selected, other active ingredients such as expansion clinker are bound according to the molecular weight of the polyacrylamide and the corresponding viscosity when cement paste is added, and the binding of the polyacrylamide mucous membrane is destroyed when the pH reaches a peak value in the later hydration stage along with the progress of cement hydration, so that other materials can participate in the later hydration of cement.
In order to further optimize the expansion property of the cement slurry after curing and the compressive strength of the cement stone, preferably, the low-temperature expansion agent for the well cementing cement slurry consists of the following components in parts by weight: 25 parts of gypsum, 5 parts of anhydrous sodium sulfate, 30 parts of expansion clinker and 40 parts of polyacrylamide.
In order to effectively ensure the expansion amount of the cement stone under the condition of low temperature, the expansion clinker is an HDDP expansion material which is derived from Xinjiang Huade petroleum technology Co., ltd and belongs to an expansion material with good low temperature performance.
In order to further enhance the interfacial bonding strength of the cement sheath, the sleeve and the stratum on the basis of not affecting the low-temperature expansion amount of the cement, and reduce the porosity and the permeability of the cement, the compressive strength of the cement is improved, and preferably, the polyacrylamide is anionic polyacrylamide. In order to effectively ensure that most of the expansion occurs in the later stage of hydration, more preferably, the molecular weight of the anionic polyacrylamide is 50-200 ten thousand.
It is easy to understand that the corresponding initial raw materials of the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are all in powder form, and on the basis of considering the cost, the particle sizes of the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are preferably 80-100 meshes in order to better optimize the effect of the corresponding components in the whole system.
It should be pointed out that the related products of the low-temperature expansion agent for the well cementation cement paste are externally added according to the mass of the cementing material in the well cementation cement paste system with different design requirements in the application process. When the cement slurry is specifically mixed, the expanding agent and the cement slurry dry material can be premixed uniformly, and then the mixing water is added for uniform stirring. Preferably, the amount of the expanding agent in the well cementation cement slurry is 1-3%.
In order to ensure compatibility and adaptability of the expanding agent and the well cementation cement slurry, thereby ensuring exertion of expansion performance and compressive strength under low temperature conditions, the well cementation cement slurry is preferably composed of the following components in parts by weight: 100 parts of G-grade oil well cement, 1-3 parts of HBL-2S fluid loss agent (non-permeable fluid loss agent), 1-3 parts of HBQ-66S coagulant and water. Cement ratio of cement paste for well cementation is 0.44, cement paste density is 1.90g/cm 3 。
The preparation method of the low-temperature expansion agent for the well cementation cement paste adopts the following technical scheme:
the preparation method of the low-temperature expanding agent for the well cementation cement paste comprises the following steps:
1) Uniformly mixing the gypsum and the anhydrous sodium sulfate according to a designed proportion to obtain a mixture;
2) And (3) adding the expansion clinker and the polyacrylamide into the mixture obtained in the step (1) according to the designed proportion, and uniformly mixing to obtain the low-temperature expansion agent for the well cementation cement paste.
The preparation method of the low-temperature expansion agent for the well cementation cement paste has the advantages of easily available raw materials, simple operation and high production efficiency, and the low-temperature expansion agent prepared by the method can realize larger expansion amount of the cement paste at low temperature, can effectively ensure the compressive strength of the cement paste, and has good applicability as a whole.
It will be appreciated that the present invention requires a sieving operation of the feedstock prior to the mixing step of the feedstock to control the overall particle size of the low temperature expansion agent. In order to ensure that the obtained expanding agent can keep good application effects of cement stone expansion and compressive strength in the use process, preferably, the raw gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are respectively sieved by a sieve of 80-100 meshes before being mixed.
In order to improve the mixing effect of the raw materials and ensure the mixing efficiency, preferably, in the step 1), the raw materials are uniformly mixed at the rotating speed of 30-50 r/min, and the mixing time is 30-40 min; in the step 2), the uniform mixing is carried out at the rotating speed of 30-50 r/min, and the mixing time is 30-40 min. More preferably, in the steps 1) and 2), the mixture is uniformly mixed at a rotating speed of 40r/min for 30min.
Detailed Description
Embodiments of the low temperature expansion agent for well cementing cement slurry and the method of preparing the same according to the present invention are further described below with reference to specific examples.
The raw materials used in the following examples are all commercially available in the art unless otherwise specified. Wherein the expansion clinker is an HDDP expansion material, and is purchased from Xinjiang Huade petroleum technology Co., ltd; the polyacrylamide is anionic polyacrylamide with the molecular weight of 50-200 ten thousand. The particle size of the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide is 80-100 meshes.
1. Examples of low temperature expansion agents for well cementing slurries
Example 1
The low-temperature expanding agent for the well cementation cement paste comprises the following components in parts by weight: 35 parts of gypsum, 5 parts of anhydrous sodium sulfate, 20 parts of expansion clinker and 40 parts of polyacrylamide.
Example 2
The low-temperature expanding agent for the well cementation cement paste comprises the following components in parts by weight: 25 parts of gypsum, 10 parts of anhydrous sodium sulfate, 25 parts of expansion clinker and 40 parts of polyacrylamide.
Example 3
The low-temperature expanding agent for the well cementation cement paste comprises the following components in parts by weight: 25 parts of gypsum, 5 parts of anhydrous sodium sulfate, 30 parts of expansion clinker and 40 parts of polyacrylamide.
Example 4
The low-temperature expanding agent for the well cementation cement paste comprises the following components in parts by weight: 25 parts of gypsum, 5 parts of anhydrous sodium sulfate, 20 parts of expansion clinker and 50 parts of polyacrylamide.
Example 5
The low-temperature expanding agent for the well cementation cement paste comprises the following components in parts by weight: 25 parts of gypsum, 5 parts of anhydrous sodium sulfate, 25 parts of expansion clinker and 45 parts of polyacrylamide.
2. Examples of methods for preparing Low temperature expansion Agents for well cementing Cement slurries
Example 6
The preparation method of the low-temperature expansion agent for well cementation cement slurry of the embodiment is described as the preparation method of the low-temperature expansion agent of the embodiment 1, and comprises the following steps:
1) Respectively sieving the raw gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide with a 80-100 mesh sieve for standby;
2) Adding the sieved gypsum and anhydrous sodium sulphate into mixing equipment for uniform mixing to obtain a mixture; the rotation speed adopted by mixing is 40r/min, and the mixing time is 30min;
3) Adding the sieved expansion clinker and polyacrylamide into the mixture obtained in the step 2), and uniformly mixing to obtain the low-temperature expansion agent for the well cementation cement paste of the embodiment 1; the rotation speed adopted by mixing is 40r/min, and the mixing time is 30min.
Examples 7 to 10
The preparation methods of the low-temperature expansion agents for well cementation cement slurries of examples 7 to 10 were carried out to prepare the low-temperature expansion agents of examples 2 to 5, and specific preparation steps and parameters were the same as those of example 6.
3. Comparative example
Comparative example 1
The swelling agent of this comparative example was different from example 1 in that the swelling agent did not contain gypsum, and the other components and amounts were the same as those of example 1.
Comparative example 2
The expansion agent of this comparative example is different from example 1 in that the expansion agent does not contain anhydrous sodium sulfate, and other components and amounts are the same as those of example 1.
Comparative example 3
The expansion agent of this comparative example is different from example 1 in that the expansion agent does not contain an expansion clinker, and other components and amounts are the same as in example 1.
Comparative example 4
The swelling agent of this comparative example was different from example 1 in that the swelling agent did not contain polyacrylamide, and the other components and amounts were the same as in example 1.
Comparative example 5
The swelling agent of this comparative example is different from example 1 in that the gypsum is replaced with semi-hydrated gypsum in the prior art.
Comparative example 6
The swelling agent of this comparative example is different from example 1 in that polyvinyl alcohol 2488 of the prior art is used instead of polyacrylamide in the swelling agent.
4. Test examples
Test example 1
The low-temperature expansion properties of the expansion agents of examples 1 to 5 and comparative examples 1 to 6 of the present invention were measured, and the results are shown in Table 1. The specific test method and test process are as follows: the expanding agent of examples 1-5 and comparative examples 1-6 was added to cement paste at an external mixing ratio of 3%, then the cement paste was made into cuboid set cement (specification 2.54 cm. Times.2.54 cm), the two ends of the test body were fitted with measuring heads, after 24 hours of molding, the initial length was measured by a screw micrometer, and then the test body was placed in a curing chamber to a prescribed age (24 hours, 45 ℃) and the length was measured again.
Wherein, the well cementation cement paste comprises the following components: 100 parts of G-grade oil well cement, 2.5 parts of HBL-2S fluid loss agent, 1 part of HBQ-66S coagulant and water. Cement ratio of cement paste for well cementation is 0.44, cement paste density is 1.90g/cm 3 。
Test example 2
The low-temperature expansion agents for well cementing cement slurries of examples 1 to 5 of the present invention and the expansion agents of comparative examples 1 to 6 were used to test the porosity and permeability of the resulting set cement, and the results are shown in table 1. The specific test method and test process are as follows: the expansion agents of examples 1 to 5 and comparative examples 1 to 6 were added to the cement slurry for well cementation at an external mixing ratio of 3%, and the cement slurry was then cured at a temperature of 40℃for 24 hours. After the cement slurry is cured under the preset test conditions, the test mould containing the cement sample is taken out from the curing chamber or the water bath, the cover plate is removed, and the sample is placed in water and cooled to the room temperature. Before the permeability is measured, the sample is cleaned under water flow, sundries are removed by using a soft wire brush, abrasive cloth and the like, and a cement penetrometer is adopted for testing the porosity and the permeability according to the requirements of GB/T19139. Wherein, the composition of the well cementation cement paste is the same as that of test example 1.
Test example 3
The compressive strength of the set cement obtained after the application of the swelling agents of examples 1 to 5 of the present invention and comparative examples 1 to 6 was measured, and the results are shown in Table 1. The specific test method and test process are as follows: the swelling agents of examples 1 to 5 and comparative examples 1 to 6 were added to cement paste at an external mixing ratio of 3%, and then the cement paste was made into a rectangular solid (5.08 cm. Times.5.08 cm) set cement by a special mold, and after curing for 24 hours at 45 ℃, the set cement strength was measured by a set cement pressure tester. Wherein, the composition of the well cementation cement paste is the same as that of test example 1.
TABLE 1 results of Performance test of the swelling agents of examples 1 to 5 and comparative examples 1 to 6
As can be seen from Table 1, compared with the comparative example, the low-temperature expansion agent of the invention has the characteristics of synergistic effect of the raw material components, can enable cement slurry to have a better expansion rate under the low-temperature condition, effectively improve the porosity and permeability of cement stone, improve the compressive strength of cement stone, and effectively meet the well cementation construction requirement under the low-temperature condition.
Claims (10)
1. The low-temperature expanding agent for the well cementation cement paste is characterized by comprising the following components in parts by weight: 25-35 parts of gypsum, 5-10 parts of anhydrous sodium sulfate, 20-30 parts of expansion clinker and 40-50 parts of polyacrylamide.
2. The low temperature expansion agent for well cementing slurry according to claim 1, which is composed of the following components in parts by weight: 25 parts of gypsum, 5 parts of anhydrous sodium sulfate, 30 parts of expansion clinker and 40 parts of polyacrylamide.
3. A low temperature expansion agent for a well cementing slurry according to claim 1, wherein the expansion clinker is HDDP expansion material.
4. The low temperature expansion agent for well cementing slurry according to claim 1, wherein said polyacrylamide is an anionic polyacrylamide.
5. The low temperature swelling agent for well cementing slurry according to claim 4, wherein the molecular weight of the anionic polyacrylamide is 50 to 200 ten thousand.
6. The low-temperature expansion agent for well cementation cement paste according to claim 1, wherein the particle sizes of the gypsum, the anhydrous sodium sulphate, the expansion clinker and the polyacrylamide are all 80-100 meshes.
7. The low-temperature expansion agent for well cementation cement paste according to claim 1, wherein the amount of the expansion agent in the well cementation cement paste is 1-3%.
8. A method of preparing a low temperature expansion agent for a well cementing slurry according to claim 1, comprising the steps of:
1) Uniformly mixing the gypsum and the anhydrous sodium sulfate according to a designed proportion to obtain a mixture;
2) And (3) adding the expansion clinker and the polyacrylamide into the mixture obtained in the step (1) according to the designed proportion, and uniformly mixing to obtain the low-temperature expansion agent for the well cementation cement paste.
9. The method for preparing a low-temperature expansion agent for well cementation cement paste according to claim 8, wherein in the step 1), the uniform mixing is performed at a rotating speed of 30-50 r/min for 30-40 min.
10. The method for preparing a low-temperature expansion agent for well cementation cement paste according to claim 8, wherein in the step 2), the uniform mixing is performed at a rotating speed of 30-50 r/min for 30-40 min.
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| CN (1) | CN116947362A (en) |
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2022
- 2022-04-20 CN CN202210418677.1A patent/CN116947362A/en active Pending
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