CN110846007A - Latex anti-channeling cement composition and cement slurry for adjusting well cementation - Google Patents
Latex anti-channeling cement composition and cement slurry for adjusting well cementation Download PDFInfo
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- CN110846007A CN110846007A CN201911221542.0A CN201911221542A CN110846007A CN 110846007 A CN110846007 A CN 110846007A CN 201911221542 A CN201911221542 A CN 201911221542A CN 110846007 A CN110846007 A CN 110846007A
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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
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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
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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
- 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
Abstract
The invention belongs to the technical field of petroleum drilling, and particularly relates to a latex anti-channeling cement composition and cement slurry for well cementing adjustment. The latex anti-channeling cement composition mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former. The cement paste formed by the latex anti-channeling cement composition and water has good comprehensive performance, has the characteristics of short transition time, low filtration loss, micro-expansion, good toughness and the like, and has better anti-channeling performance when being used for adjusting well cementation.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling, and particularly relates to a latex anti-channeling cement composition and cement slurry for well cementing adjustment.
Background
After the oil field is developed for a long time, the formation energy is seriously insufficient, and the frequently-mined blocks generally need to be injected with water or polymer to supplement the formation energy. And the next two gates, twin rivers, ancient cities and other blocks have entered the era of tertiary oil recovery represented by polymer flooding and ternary combination flooding. The development over time has led to extremely complex pressure systems and fluid properties in the oil field. Because the pressure difference between the upper layers in the longitudinal direction is large, the contradiction between pressure stability and leakage prevention when a new drill is used for adjusting well cementation is prominent. The micro-gap generated by the volume shrinkage after the cement is hydrated for well cementation leads the well cementation quality to be difficult to ensure, thereby generating the problems of unqualified production layer or interlayer sealing, oil, gas and water leakage outside a casing pipe and the like, causing interlayer interference to layered injection and production, complicating the oil production process, reducing the utilization rate of an oil well and shortening the service life of the oil well.
In the prior art, a Chinese patent application publication No. CN106892594A discloses a micro-expansion toughened cement slurry, which comprises the following components in parts by weight: 100 parts of oil well cement, 8-15 parts of latex, 1-2 parts of fluid loss additive, 1-5 parts of drag reducer, 1-2 parts of early strength agent, 2-4 parts of expanding agent, 0.2-0.5 part of defoaming agent and 40 parts of water, wherein the adopted expanding agent is CD-10 oil well cement expanding agent. The cement slurry has the characteristics of micro-expansion, low filtration loss, good rheological property and the like, but the transition time is long, and the requirement of well cementation of an adjusting well is difficult to meet.
Disclosure of Invention
The invention aims to provide a latex anti-channeling cement composition for adjusting well cementation, which can shorten the transition time of cement slurry.
It is also an object of the present invention to provide a cement slurry for adjusting the cementing of a well, which cement slurry has a short transition time.
In order to achieve the above objects, the latex anti-channeling cement composition for adjusting well cementation of a well according to the present invention employs the technical scheme of:
a latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.
The latex anti-channeling cement composition of the invention has the following functions: the aim of improving the toughness and compactness of cement is fulfilled by utilizing the characteristics of high elasticity of latex, flexibility of an adhesive film and good cementing capacity between the latex and oil well cement; the fluid loss agent has the function of reducing the filtration loss of cement; the early strength agent has the function of improving the early compressive strength of the cement. The latex anti-channeling cement composition is mixed with water to form cement paste, and micro air bubbles generated by the expanding agent are uniformly distributed in the cement paste, so that the pressure loss and the volume shrinkage during the solidification of the cement paste can be effectively compensated; the drag reducer has the functions of improving the rheological property of cement paste and reducing the flow resistance; the defoaming agent has the function of eliminating bubbles. The latex anti-channeling cement composition can shorten the transition time of cement paste and has good compatibility among the components.
Preferably, the latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. The latex anti-channeling cement composition composed of the components in parts by weight has the best performance.
The aluminum powder gas former is at least one of QJ625 oil well cement expanding agent, TW502 and DG 29.
The technical scheme adopted by the cement slurry for adjusting well cementation of the invention is as follows:
a cement slurry for adjusting well cementation comprises water and the latex anti-channeling cement composition for adjusting well cementation.
The cement slurry for adjusting well cementation of the well increases the compactness of cement by utilizing the characteristic of good cementing capacity of latex and a cement matrix, thereby improving the anti-channeling capacity of a cement body. In addition, by adding the aluminum powder gas-generating expanding agent into the cement paste, the hardened cement stone volume is larger than the cement paste volume before hydration in the cement paste hydration process, thereby avoiding the cement stone volume from shrinking to form micro-gaps and achieving the purpose of improving the well cementation quality and preventing the channeling outside the pipe. The cement slurry has the characteristics of short transition time, small filtration loss, no volume shrinkage, good toughness and the like, has good anti-channeling effect, excellent performance, simple preparation method and excellent quality of on-site implementation well cementation, can effectively solve the problem of adjusting channeling outside a well pipe by a high-pressure water injection polymer injection block, and improves the quality of well cementation.
The mass ratio of the water to the oil well cement in the latex anti-channeling cement composition is (5-6): (12-14).
Detailed Description
The latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.
Preferably, the oil well cement is a grade G oil well cement. Further preferably, the oil well cement is a G-grade high sulfate-resistant oil well cement.
Preferably, the latex is styrene-butadiene latex or polybutadiene latex. More preferably, the latex is BCT-800L styrene-butadiene latex.
Preferably, the fluid loss agent is a polymer fluid loss agent. Further preferably, the fluid loss agent is a nonionic synthetic polymer fluid loss agent. More preferably, the fluid loss additive is at least one of G33S oil well cement high temperature resistant salt resistant fluid loss additive, W99, TW200S and G303. Preferably, the fluid loss agent is a G33S oil well cement high temperature resistant salt resistant fluid loss agent.
Preferably, the drag reducer is a naphthalenesulfonic acid formaldehyde condensate drag reducer. More preferably, the drag reducer is a USZ oil well cement high temperature resistant drag reducer.
Preferably, the early strength agent is a compound early strength agent. More preferably, the early strength agent is one of G203 oil well cement early strength agent and G209 early strength agent. Preferably, the early strength agent is a G203 oil well cement early strength agent.
Preferably, the defoaming agent is a silicone oil type defoaming agent. More preferably, the antifoaming agent is D50 antifoaming agent, XP-1 antifoaming agent, XP-2 antifoaming agent. Preferably, the defoamer is a D50 defoamer.
The cement slurry for adjusting well cementation of the invention is prepared by the method comprising the following steps:
(1) mixing oil well cement, a fluid loss agent, a drag reducer, an early strength agent and an expanding agent according to the formula ratio to obtain a mixture A; adding the latex and the defoaming agent in the formula amount into the water in the formula amount, and mixing to obtain a mixture B;
(2) and (2) adding the mixture A obtained in the step (1) into the mixture B for mixing to obtain the catalyst.
And (2) when the mixture A is prepared in the step (1), the mixture is mixed and stirred in a dry mixer for 3-5 min at room temperature, and when the mixture B is prepared, the mixture is stirred at the stirring speed of 150-250 r/min for 5-10 min at room temperature.
And (3) when the mixture A is added into the mixture B in the step (2), adding the mixture A at a constant speed at a stirring speed of 3500-4500 r/min, and finishing within 15 s.
And (3) after the mixture A is added into the mixture B in the step (2), stirring for 34-36 s at a stirring speed of 11500-12500 r/min.
The present invention will be further described with reference to the following specific examples.
In the following examples, the oil-well cement used was a G-grade high sulfate-resistant oil-well cement (Kaga corporation, Sichuan), the latex was BCT-800L butylbenzene latex (Kaga engineering science and technology Co., Ltd., Tianjin), the fluid loss additive was a G33S oil-well cement high-temperature-resistant salt-resistant fluid loss additive (Kaga chemical Co., Ltd.), the drag reducer was a USZ oil-well cement high-temperature-resistant drag reducer (Kaga chemical Co., Ltd.), the early strength additive was a G203 oil-well cement early strength additive (Kaga chemical Co., Ltd.), and the defoaming agent was a G50 defoaming agent (Kaga engineering science and technology Co., Ltd., Tianjin).
Examples of a latex anti-channeling cement composition for adjusting well cementing
Example 1
The latex anti-channeling cement composition of the present example is composed of the following components in parts by weight: 65 parts of oil well cement, 3 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing).
Example 2
The latex anti-channeling cement composition of the present example is composed of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing).
Example 3
The latex anti-channeling cement composition of the present example is composed of the following components in parts by weight: 65 parts of oil well cement, 1.5 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing).
Second, embodiments of cement slurries for adjusting well cementing
Example 4
The cement slurry of this example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 3 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
the cement slurry of this example was prepared by a method comprising the steps of:
(1) under the condition of room temperature, uniformly mixing the fluid loss additive, the drag reducer, the early strength agent and the oil well cement in the formula amount for 4min by using an oil well cement mixing device to obtain a mixture A;
(2) adding the latex and the defoaming agent in the formula amount into water at room temperature, and stirring for 15min at a stirring speed of 200r/min to obtain a mixture B;
(3) and (3) placing the mixture B on a constant-speed stirrer, adding the mixture A into the mixture B at a constant speed under the stirring speed of 4000r/min, completing the addition within 15s, and then stirring for 35s under the stirring speed of 12000r/min to obtain the compound.
Example 5
The cement slurry of this example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
the preparation of the cement paste of this example was carried out in the same manner as in example 4, except that the amount of latex used was different.
Example 6
The cement slurry of this example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 1.5 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
the preparation of the cement paste of this example was carried out in the same manner as in example 4, except that the amount of latex used was different.
Example 7
The cement slurry of this example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.2 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
method for preparing cement paste of this example 4 the method for preparing cement paste was the same except that the amount and type of the swelling agent used were different.
Example 8
The cement slurry of this example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.4 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
method for preparing cement paste of this example 4 the method for preparing cement paste was the same except that the amount and type of the swelling agent used were different.
In other embodiments of the invention, the bulking agent may also be DG29 or TW 502. Experimental results show that the expanding agent adopting QJ625 has better effect.
Comparative example 1
The cement slurry of this comparative example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. Wherein the swelling agent is QJ625 (Kyoto Okaili technologies, Inc., Beijing). 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
the grout preparation of this example was as described in example 4 except that no latex was added and the remainder was the same.
Comparative example 2
The cement slurry of this comparative example comprises water and a latex anti-channeling cement composition consisting of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent and 0.2 part of defoaming agent. 29 parts of water, and the weight ratio of the water to the oil well cement is 5.8: 13.
the grout of this example was prepared according to the grout of example 4 except that no expansion agent was added and the balance was the same.
Test example 1
The detection of the permeability is carried out on the cement slurries of the embodiments 4 to 6 and the cement slurry of the comparative example 1. The detection method comprises the following steps: a steel mold having a length of 25.4mm, a tapered inner diameter of from 27.99mm (top) to 29.31mm (bottom) and an outer diameter of 50.80mm was charged with cement slurry (five in each set), cured in a water bath at 45 ℃ and 80 ℃ for 24 hours, demolded, and tested for permeability of set cement using a cement permeameter (or the like). The test results are shown in table 1.
TABLE 1 permeability test results for cement slurries at different temperatures
As can be seen from table 1, compared with comparative example 1, the permeability of the cement paste of the present invention at different temperatures was 0, which demonstrates that the cement paste of the present invention has good anti-channeling properties.
Test example 2
The cement slurries of example 5 and comparative example 1 were tested for linear expansion. The detection method comprises the following steps: the three-way test mold with the length of 1cm multiplied by 6cm is adopted for forming, and measuring heads are arranged at two ends of the test mold. Respectively placing into cement slurry, placing in water bath at 45 deg.C and 80 deg.C, curing to final set, demolding for 2 hr, cooling to 25 deg.C, and measuring initial length (l) with micrometer1In m). Then, the test bodies (6 pieces per group) were maintained at 45 ℃ and 80 ℃ for a prescribed age, and the swelling amount (l) was measured after cooling in water to 25 ℃2In m). The linear expansion coefficient was calculated using the following formula: linear expansion coefficient (%) ═ l1-l2) X 100/R, wherein R is a correction coefficient, and R is 55 when the length of the test body is 6 cm. The test results are shown in table 2.
TABLE 2 dilatancy of the cement slurries at different curing times
As can be seen from Table 2, the shrinkage of the cement paste of comparative example 1 increases with the increase of curing time at different curing temperatures, and the expansion rate thereof is-0.006 to-0.015%; the expansion rate of the cement paste is 0.001-0.010%.
Test example 3
The slurries of examples 5, 7 and 8 according to the invention and comparative example 2 were tested for transition time. The specific detection method comprises the following steps: and (3) measuring the transition time and the thickening time by adopting a high-temperature high-pressure thickener, setting the temperature to be 45 ℃, the pressure to be 20MPa and the temperature rise time to be 20 min. The test results are shown in table 3.
TABLE 3 transition time and thickening time of slurries under different swelling amounts
As can be seen from Table 3, the addition of the swelling agent can shorten the transition time of the cement paste, ensure the stable formation of the cement paste in the setting process and improve the anti-channeling performance of the cement paste. The transition time is gradually shortened as the amount of the expanding agent added is increased.
Test example 4
The engineering properties of the cement slurries of example 8 of the invention were determined in the laboratory according to the standard "GBT 19139-2003 oil well cement test method" and the test results are shown in Table 4.
TABLE 4 engineering Properties of the grout
Test example 5
The cement slurries of the embodiments 4 to 8 of the invention are respectively injected into a target well to test the engineering performance of the target well. The injection process is to inject the mixture A and the mixture B into a target well by using cement vehicle-side mixing when the mixture A and the mixture B are mixed in the preparation process of cement paste. Target well base case for cement slurry of example 4: actually completing drilling with a depth of 1564m, designing a casing pipe with a lower depth of 1552m, an oil layer position of 740 m-1513 m and a gas-containing layer; target well base for cement slurry of example 5: actually completing the drilling well with the depth of 1830m, designing the lower depth of the casing pipe with the depth of 1820m, returning the cement paste with the depth of 300m and forming a gas-containing layer; target well base case for cement slurry of example 6: target well base case for cement slurry of example 6: the actual drilling depth is 1445m, the design casing lower depth is 1434m, the oil layer position is 739 m-1276 m, and the gas layer is formed; target well base case for cement slurry of example 7: the actual drilling depth is 1825m, the lower depth of the casing is 1813m, the oil layer position is 650 m-1629 m, and the gas layer is designed; target well base case for cement slurry of example 8: the actual drilling depth is 1505m, the designed casing lower depth is 1495m, the oil layer position is 680 m-1219 m, and the gas-bearing layer is formed.
The test results are shown in Table 5, in which 20.7MPa of the compressive strength is the pressure in the curing pot, which corresponds to the curing pressure of the cement block mold.
TABLE 5 engineering Properties of the grout
Claims (5)
1. A latex anti-channeling cement composition for adjusting well cementation is characterized by mainly comprising the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.
2. The latex anti-channeling cement composition for adjusting well cementation according to claim 1, characterized by consisting essentially of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent.
3. The latex channeling-preventing cement composition for regulating well cementing according to claim 1, wherein said aluminum powder gas generating agent is at least one of QJ625 oil well cement swelling agent, TW502, DG 29.
4. A cement slurry for adjusting well cementation, comprising water and the latex anti-channeling cement composition for adjusting well cementation according to claim 1.
5. The cement slurry for adjusting well cementation according to claim 4, wherein the mass ratio of the water to the oil well cement in the latex anti-channeling cement composition is (5-6): (12-14).
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| CN113429164A (en) * | 2021-06-17 | 2021-09-24 | 中国石油化工股份有限公司 | Low-density high-strength toughened cement slurry system for oil layer and preparation method thereof |
| CN116023052A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
| CN116023051A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
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Cited By (3)
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| CN113429164A (en) * | 2021-06-17 | 2021-09-24 | 中国石油化工股份有限公司 | Low-density high-strength toughened cement slurry system for oil layer and preparation method thereof |
| CN116023052A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
| CN116023051A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
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