Ultrahigh-temperature retarder as well as preparation method and application thereof in well cementation cement

Abstract

The invention relates to the technical field of well cementation materials, and provides an ultrahigh-temperature retarder, a preparation method thereof and application of the ultrahigh-temperature retarder in well cementation cement. The invention relates to an ultrahigh-temperature retarder, which comprises hydroxyl carboxylate and 1-carboxymethylamine adamantane. According to the technical scheme, the problems that a retarder in the related technology is narrow in applicable temperature range and influences the strength of set cement are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of materials for well cementing, and specifically, to a super-high temperature retarder, a preparation method thereof, and an application thereof in well cementing cement. Background Art

[0002] In various links such as oil exploration, exploitation, storage and transportation, and oil product consumption, various oilfield chemicals are needed. With the rapid development of the oil industry and the continuous growth of the demand for oil products, there is an urgent need to improve the quality of oil products and change the product structure. Therefore, the demand for oilfield chemicals is also increasing continuously.

[0003] The oilfield chemicals for well cementing are a relatively weak link in China, especially in terms of retarders. The high-temperature retarder for well cementing is a key admixture to ensure the smooth progress of well cementing operations in high-temperature deep wells and ultra-deep wells. Currently, the retarders adopted are one type of organic polymers such as sulfonic acid group-containing polymers and phosphonic acid group-containing polymers, and the other type is hydroxycarboxylic acids and their salts; their applicable temperature range is narrow, and it affects the strength of the cement stone. Summary of the Invention

[0004] The present invention provides a super-high temperature retarder, a preparation method thereof, and an application thereof in well cementing cement, which solves the problems of narrow applicable temperature range of the retarder and affecting the strength of the cement stone in the related art.

[0005] The technical solution of the present invention is as follows: A super-high temperature retarder, comprising a hydroxycarboxylate and 1-carboxymethylaminoadamantane.

[0006] As a further technical solution, the mass of the hydroxycarboxylate ≤ the mass of the 1-carboxymethylaminoadamantane.

[0007] In the present invention, it is defined that the mass of the hydroxycarboxylate ≤ the mass of the 1-carboxymethylaminoadamantane, which further improves the strength of the cement stone.

[0008] As a further technical solution, the mass ratio of the hydroxycarboxylate to the 1-carboxymethylaminoadamantane is 1:3 - 4.

[0009] In the present invention, it is defined that the mass ratio of the hydroxycarboxylate to the 1-carboxymethylaminoadamantane is 1:3 - 4, which further improves the strength of the cement stone.

[0010] In the present invention, the hydroxycarboxylate can be any one or more conventional hydroxycarboxylates in the art, for example, it can be one or two of potassium citrate and sodium glucoheptonate, and preferably sodium glucoheptonate.

[0011] In the present invention, the retarding agent has a wide applicable temperature range and can be used at temperatures above 220°C. It has good high-temperature stability, strong adaptability to cement, water and other admixtures, and will not have a negative impact on the strength of the cement stone.

[0012] The present invention also provides a preparation method of the ultra-high temperature retarding agent, which includes the following steps: uniformly mixing a hydroxycarboxylate and 1-carboxymethylaminoadamantane to obtain the ultra-high temperature retarding agent.

[0013] As a further technical solution, the mixing time is 1 to 5 minutes.

[0014] As a further technical solution, the rotation speed during mixing is 2000 to 4000 r / min.

[0015] The present invention also provides an application of the ultra-high temperature retarding agent or the ultra-high temperature retarding agent prepared by the preparation method in well cementing.

[0016] The working principle and beneficial effects of the present invention are as follows: The present invention provides an ultra-high temperature retarding agent, which includes a hydroxycarboxylate and 1-carboxymethylaminoadamantane. Adding it to the cement slurry can effectively extend the thickening time of the cement slurry, enabling the cement slurry to be safely pumped to the predetermined position and meeting the requirements of high-temperature well construction. Specific Embodiments

[0017] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0018] Example 1 The ultra-high temperature retarding agent is potassium citrate and 1-carboxymethylaminoadamantane with a mass ratio of 3:1.

[0019] Example 2 The ultra-high temperature retarding agent is sodium glucoheptonate and 1-carboxymethylaminoadamantane with a mass ratio of 3:1.

[0020] Example 3 The ultra-high temperature retarding agent is sodium glucoheptonate and 1-carboxymethylaminoadamantane with a mass ratio of 1:1.

[0021] Example 4 The ultra-high temperature retarding agent is sodium glucoheptonate and 1-carboxymethylaminoadamantane with a mass ratio of 1:3.

[0022] Example 5 Ultra-high temperature retarder, which is sodium glucoheptonate and 1-carboxymethylaminoadamantane with a mass ratio of 1:4.

[0023] Example 6 Ultra-high temperature retarder, which is sodium glucoheptonate and 1-carboxymethylaminoadamantane with a mass ratio of 1:7.

[0024] Comparative Example 1 Ultra-high temperature retarder, which is sodium glucoheptonate and disodium ethylenediaminetetraacetate with a mass ratio of 3:1.

[0025] Comparative Example 2 Ultra-high temperature retarder, which is sodium glucoheptonate.

[0026] Comparative Example 3 Ultra-high temperature retarder, which is 1-carboxymethylaminoadamantane.

[0027] Performance test: Prepare the retarder into cement slurry: G-class oil well cement + 35% quartz sand + 1.5% BFR-30L oil well cement dispersant + 5% BFL-12L oil well cement fluid loss reducer + 1.5% retarder + water (% refers to the mass percentage of cement), water-cement ratio 0.44. Test the thickening time and compressive strength according to the method in SY / T5504.1-2013, and record the test results in Table 1 and Table 2.

[0028] Table 1

[0029] It can be seen from Table 1 that the high-temperature retardation effect of the retarders obtained in Examples 1-2 is better than that in Comparative Examples 1-3. In addition, the results of Examples 3-6 are similar to those of Example 2, indicating that the combined use of hydroxycarboxylate and 1-carboxymethylaminoadamantane has better retardation performance for oil well cement at ultra-high temperatures.

[0030] Table 2

[0031] It can be seen from Table 2 that the 24-hour compressive strength of the cement slurry prepared with the retarder provided by the present invention is above 21.1 MPa, and it will not have a negative impact on the strength of the cement stone.

[0032] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Ultra-high temperature retarder, characterized in that: Including hydroxycarboxylates and 1-carboxymethylamino adamantane.

2. The ultra-high temperature retarder according to claim 1, characterized in that: The mass of the hydroxycarboxylate is ≤ the mass of the 1-carboxymethylamino adamantane.

3. The ultra-high temperature retarder according to claim 2, characterized in that: The mass ratio of the hydroxycarboxylate to 1-carboxymethylamino adamantane is 1:3-4.

4. The ultra-high temperature retarder according to claim 1, characterized in that: The hydroxycarboxylate includes one or both of potassium citrate and sodium gluconate.

5. The ultra-high temperature retarder according to claim 4, characterized in that: The hydroxycarboxylate is sodium gluconate.

6. The ultra-high temperature retarder according to claim 1, characterized in that: Operating temperature ≥220℃.

7. The method for preparing the ultrahigh temperature retarder according to any one of claims 1 to 6, characterized in that: The following steps are involved: The hydroxycarboxylate and 1-carboxymethylamino adamantane are uniformly mixed to obtain an ultra-high temperature retarder.

8. The method for preparing the ultrahigh temperature retarder according to claim 7, characterized in that: The mixing time is 1 to 5 minutes.

9. The method for preparing the ultrahigh temperature retarder according to claim 7, characterized in that: The rotating speed during the mixing is 2000-4000 r / min.

10. Use of the ultra-high temperature retarder according to any one of claims 1 to 6 or the ultra-high temperature retarder prepared by the preparation method according to any one of claims 7 to 9 in cementing cement.

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