CN107502324B - Multi-effect additive for well cementation low-density cement slurry and preparation method thereof - Google Patents
Multi-effect additive for well cementation low-density cement slurry and preparation method thereof Download PDFInfo
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- CN107502324B CN107502324B CN201710722632.2A CN201710722632A CN107502324B CN 107502324 B CN107502324 B CN 107502324B CN 201710722632 A CN201710722632 A CN 201710722632A CN 107502324 B CN107502324 B CN 107502324B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/473—Density reducing additives, e.g. for obtaining foamed cement compositions
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- C—CHEMISTRY; METALLURGY
- 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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Abstract
The application discloses a multi-effect additive for well cementation low density cement slurry and a preparation method thereof. The multi-effect additive comprises 40-50 wt% of alkali metal silicate and/or alkali metal metasilicate, 0-5 wt% of polyvinyl alcohol, 5-15 wt% of cellulose ether, 4-10 wt% of AMPS polymer, 0.1-0.5 wt% of thickening agent, 1-5 wt% of dispersing agent, 0.1-0.2 wt% of bactericide and the balance of water. The preparation method comprises the steps of uniformly mixing alkali metal silicate and/or alkali metal metasilicate with water; adding a dispersing agent, an AMPS polymer, cellulose ether, polyvinyl alcohol, a thickening agent and a bactericide, and uniformly stirring at 30-70 ℃. The multi-effect additive for well cementation low density cement slurry has the advantages of simple formula, good suspension stability and water loss reduction performance, capability of effectively inhibiting the generation of free liquid, wide application temperature range, and convenience in offshore platform construction feeding due to the fact that the multi-effect additive is an aqueous agent.
Description
Technical Field
The application relates to but is not limited to a multi-effect additive for well cementation low density cement slurry and a preparation method thereof.
Background
In oil and gas production, cement slurry is injected into the formation to support the casing and pack the formation. Various additives such as fluid loss additives, retarders and the like are usually added into cement paste to ensure the performance of the cement paste. Sometimes, the density of the cement paste needs to be adjusted to prevent stratum from breaking, and at the moment, additives such as a suspending agent, a lightening agent and the like need to be added to construct a low-density cement paste system.
Common problems with low density cement slurries are: (1) the cement paste has lower strength and is difficult to adjust for thickening; (2) slurry free liquid is difficult to control, so that the performance of cement slurry at the top and the bottom is not uniform, and the cementation quality is influenced; (3) high water-ash ratios result in large water losses and require the addition of more fluid loss additives.
At present, common suspending agents for low-density cement paste comprise water glass, bentonite and the like, but the obtained cement paste has poor performance, difficult thickening adjustment and narrow temperature application range. Although the performance of the cement paste is improved by using the lightening admixture such as artificial glass beads, the formula of the cement paste is complicated, and the cost is obviously increased; the lower the density of the cement slurry to be distributed, the more significant the above problem. Meanwhile, other additives are also added for adjustment in the problems of free liquid, high water loss and the like.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides an additive for well cementation low density cement slurry and a preparation method thereof, wherein the additive has multiple functions and is wide in temperature application range.
Specifically, the application provides a multi-effect additive for well cementation low density cement slurry, which comprises the following components:
in an embodiment of the present application, the alkali metal silicate may be selected from one or more of an aqueous solution of sodium silicate, potassium silicate and lithium silicate, and the alkali metal metasilicate may be selected from one or more of an aqueous solution of sodium metasilicate, potassium metasilicate and lithium metasilicate.
In an embodiment of the present application, the mixture of the alkali metal silicate and the alkali metal metasilicate may have a modulus of 2.0 to 3.5 and a solid content of 40 to 50 mass%.
In embodiments herein, the polyvinyl alcohol may be a crosslinked polyvinyl alcohol.
Alternatively, the polyvinyl alcohol is PC-G73S, manufactured by Zhonghai oil clothing chemical Co.
In embodiments herein, the cellulose ether may be selected from one or both of hydroxyethyl cellulose and carboxymethyl hydroxyethyl cellulose.
In the present application, the term "AMPS polymer" refers to a high-molecular polymer obtained by polymerizing AMPS (2-acrylamido-2-methylpropanesulfonic acid) as a main polymerization monomer.
Optionally, the AMPS polymer is selected from one or more of PC-G80S, PC-G86S, manufactured by Zhonghai oil clothing chemical Co., Ltd, and Polytrol FL34, manufactured by BASF corporation, Ltd.
In embodiments herein, the thickener may be selected from one or more of sodium polyacrylate, welan gum, magnesium aluminum silicate, and magnesium lithium silicate.
In the embodiment of the present application, the dispersant may be one or two selected from an aldehyde ketone polycondensation-based dispersant, a polycarboxylic acid-based dispersant.
Optionally, the acetal ketal dispersant is selected from PC-F40L manufactured by zhonghai oil chemicals, ltd, USZ of henna wei chemicals, ltd.
Alternatively, the polycarboxylic acid dispersant is selected from MELMENT series products manufactured by BASF company, viscocreate series products manufactured by cika company.
In embodiments of the present application, the biocide may be a casone.
The application also provides a method for preparing the multi-effect additive for well cementation low density cement slurry, which comprises the following steps: mixing alkali metal silicate and/or alkali metal metasilicate with water uniformly; adding a dispersing agent, an AMPS polymer, cellulose ether, polyvinyl alcohol, a thickening agent and a bactericide, and uniformly stirring at 30-70 ℃.
Compared with the prior art, the multi-effect admixture has the following advantages:
1. the compatibility among all components is good, the formula is simplified, the cost is reduced, the multi-effect admixture can simultaneously have the functions of suspending cement slurry, ensuring the stability of low-density cement slurry, inhibiting the low-density cement slurry from generating free liquid, reducing the water loss of the cement slurry and the like, and the multi-effect admixture realizes 'one agent and multiple effects'.
2. The existence of the alkali metal silicate and/or the alkali metal metasilicate can inhibit the hydration thickening of the cellulose ether, greatly improve the addition amount of the cellulose ether and ensure that the multi-effect admixture of the application presents a stable suspension state.
3. The multi-effect additive is an aqueous agent, so that the offshore platform is more convenient to construct and feed, and the cost is more economic.
4. The temperature control device is suitable for being used at the temperature of 10-110 ℃, and the applicable temperature range is wide.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
(1) Weighing 100g of deionized water in a beaker, placing the beaker in a water bath kettle, and heating to 30 ℃;
(2) weighing 110g sodium water glass (modulus 3.0-3.2: purchased from Beijing Hongxing Guangxi chemical Co., Ltd.), adding into the beaker while stirring, and mixing uniformly;
(3) weighing 8g of dispersant (PC-F40L, available from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(5) weighing 12G of AMPS polymer (PC-G86S, available from Tianjin Zhonghai oil chemical Co., Ltd.), and adding into the beaker while stirring to mix well;
(6) 24g of hydroxyethyl cellulose (brand: QP 52000, purchased from Dow chemical Co., Ltd.) was weighed and added to the beaker with stirring to mix well;
(7) 8G of polyvinyl alcohol (brand: PC-G75S, purchased from Tianjin Zhonghai oil chemical Co., Ltd.) was weighed and added to the beaker with stirring to mix them uniformly;
(8) weighing 1g Wenlun gum (PC-W30S, available from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(9) and (3) weighing 0.4g of cason bactericide (a conventional commercially available product), adding the cason bactericide into the beaker while stirring, and uniformly mixing to obtain the multi-effect additive for the well cementation low density cement slurry.
Example 2
(1) Weighing 100g of deionized water in a beaker, placing the beaker in a water bath kettle, and heating to 50 ℃;
(2) weighing 100g of potassium water glass (modulus 2.4-2.6: purchased from Kyoho chemical Co., Ltd., Hongxing, Beijing), adding into the beaker while stirring, and mixing uniformly;
(3) weighing 6g of dispersant (PC-F40L, available from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(5) weighing 20G of AMPS polymer (PC-G80S, available from Tianjin Zhonghai oil chemical Co., Ltd.), and adding into the beaker while stirring to mix well;
(6) weighing 20g of hydroxyethyl cellulose (QP 52000, available from Dow chemical Co., Ltd.) and adding into the beaker while stirring to mix well;
(7) weighing 0.4g sodium polyacrylate (PC-W50S, purchased from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(8) and (3) weighing 0.4g of cason bactericide (a conventional commercially available product), adding the cason bactericide into the beaker while stirring, and uniformly mixing to obtain the multi-effect additive for the well cementation low density cement slurry.
Example 3
(1) Weighing 100g of deionized water in a beaker, placing the beaker in a water bath kettle, and heating to 70 ℃;
(2) weighing 140g sodium water glass (modulus 2.2-2.6: purchased from Beijing Hongxing Guangxi chemical Co., Ltd.), adding into the beaker while stirring, and mixing well;
(3) weighing 8g dispersant (VISCOCRETE 540P, purchased from Xika chemical Co., Ltd.), and adding into the beaker while stirring to mix well;
(5) weighing 12G AMPS polymer (PC-G80S, available from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(6) 28g of carboxymethyl hydroxyethyl cellulose (XTH-40, available from cellulose of Futai Co., Ltd.) was weighed and added to the beaker with stirring to mix well;
(7) weighing 0.6g sodium polyacrylate (PC-W50S, purchased from Tianjin Zhonghai oil chemical Co., Ltd.), stirring while adding into the beaker, and mixing well;
(8) and (3) weighing 0.4g of cason bactericide (a conventional commercially available product), adding the cason bactericide into the beaker while stirring, and uniformly mixing to obtain the multi-effect additive for the well cementation low density cement slurry.
Performance testing
1. Suspension stability Property
According to the method in the API RP 10B, the multi-effect admixture in the embodiment 1-3 is utilized to prepare cement paste, and the performance test of the cement paste is carried out. The results are reported in Table 1.
TABLE 1 stability of Low Density Cement slurries formulated with Multi-Effect Admixture
As can be seen from the data in Table 1, the low-density cement paste with small upper and lower density difference can be obtained by using the multi-effect admixture, which indicates that the obtained low-density cement paste has better suspension property and stable cement paste character; meanwhile, in the test temperature range, the thickening time of the cement paste is adjustable, and the cement paste has no adverse effect on strength development, which shows that the compatibility of the multi-effect admixture and the common well cementation admixture is good, and no adverse reaction occurs.
2. Inhibiting the production of free liquid
According to the method in the APIRP 10B, the cement paste is prepared by using the multi-effect additives in the embodiments 1-3, and the inhibition effect of the multi-effect additives on the free liquid generation of the low-density cement paste is tested. The results are reported in Table 2.
TABLE 2 data of the inhibition effect of multi-effect additives on the generation of free liquid in low-density cement slurry
As can be seen from the data in Table 2, the prepared cement paste has few free fluids, and the multi-effect admixture can effectively inhibit the free fluids generated by the low-density cement paste.
3. Water loss reducing performance
According to the method in API RP 10B, the cement paste is prepared by using the multi-effect additives of examples 1-3, and the water loss reducing performance of the multi-effect additives is tested. The results are reported in Table 3.
TABLE 3 data on water loss performance of multi-effect additives
As can be seen from the data in Table 3, the multi-effect admixture can reduce the water loss of cement slurry in a wider temperature range, can control the water loss of the cement slurry within 200ml without adding an additional water loss reducer, and can be matched with a small amount of a common well cementation water loss reducer if the water loss of the cement slurry is required to be further reduced.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (11)
1. A multi-effect additive for well cementation low density cement slurry comprises the following components:
wherein the cellulose ether is selected from one or two of hydroxyethyl cellulose and carboxymethyl hydroxyethyl cellulose;
the multi-effect additive is prepared by the following method: mixing alkali metal silicate and/or alkali metal metasilicate with water uniformly; adding a dispersing agent, an AMPS polymer, cellulose ether, polyvinyl alcohol, a thickening agent and a bactericide, and uniformly stirring at 30-70 ℃.
2. The multi-effect admixture for well cementation low density cement slurry of claim 1, wherein the alkali metal silicate is selected from one or more of sodium silicate, potassium silicate and an aqueous solution of lithium silicate, and the alkali metal metasilicate is selected from one or more of an aqueous solution of sodium metasilicate, potassium metasilicate and lithium metasilicate.
3. The multi-effect additive for well cementation low density cement slurry as claimed in claim 2, wherein the modulus of the mixture of the alkali metal silicate and the alkali metal metasilicate is 2.0-3.5, and the solid content is 40-50 mass%.
4. The multi-effect admixture for well-cementing low-density cement slurry of claim 1, wherein the polyvinyl alcohol is a crosslinked polyvinyl alcohol.
5. The multi-effect admixture for well-cementing low-density cement slurry as claimed in claim 4, wherein the polyvinyl alcohol is PC-G73S manufactured by Zhonghai oil-suit chemical Co.
6. The multi-effect admixture for well-cementing low-density cement slurry of claim 1, wherein the AMPS polymer is selected from one or more of PC-G80S, PC-G86S, manufactured by Zhonghai oil and wear chemical Co., Ltd, and PolytrolFL34, manufactured by BASF Ltd.
7. The multi-effect admixture for well-cementing low-density cement slurry of claim 1, wherein the thickener is selected from one or more of sodium polyacrylate, welan gum, magnesium aluminum silicate and lithium magnesium silicate.
8. The multi-effect additive for well cementation low density cement slurry as claimed in claim 1, wherein the dispersant is one or two selected from an aldehyde ketone condensation dispersant and a polycarboxylic acid dispersant.
9. The multi-effect admixture for well-cementing low-density cement slurry of claim 8, wherein the aldehyde condensation dispersant is selected from PC-F40L manufactured by Zhonghai oil-well chemical company, USZ manufactured by Henan Weihui chemical company, and the polycarboxylic acid dispersant is selected from MELMENT series products manufactured by BASF company, VISCOCRATE series products manufactured by Cika company.
10. The multi-effect admixture for well cementation low density cement slurry as claimed in claim 1, wherein the bactericide is Kathon.
11. A method of preparing the multi-effect admixture for well-cementing low-density cement slurry of any one of claims 1 to 10, the method comprising: mixing alkali metal silicate and/or alkali metal metasilicate with water uniformly; adding a dispersing agent, an AMPS polymer, cellulose ether, polyvinyl alcohol, a thickening agent and a bactericide, and uniformly stirring at 30-70 ℃.
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