A polymer-loaded coagulant and its preparation method and cement slurry

A polymer and load-bearing technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of slow curing at low temperature, long cement hardening time, etc., achieve short hardening time, reduce mining costs, and improve fluid mechanics effect of behavior

Active Publication Date: 2020-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention is committed to designing a functional coagulant, which can not only improve the hydrodynamic behavior of cement slurry, but more importantly, can promote cement hydration and solve the problem of low temperature To overcome the problem of long cement hardening time, a new low-temperature coagulant system was obtained to meet the requirements of deep sea cementing operations
The polymer-loaded coagulant with a synergistic effect between the polymer-loaded organic component and the inorganic substance of the present application has a specific structure and composition of the polymer-loaded organic component, and uses a polymer-type structural functional material to solve the problem. Problems in the coagulation acceleration process of cementing cement slurry, especially the problem of slow solidification at low temperature in deep sea cementing and other operating environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 500 grams of oil well cement, 5 grams of polymer-loaded organic components, 5 grams of sodium thiocyanate, and 220 grams of water, mixed at a high speed, and placed in an environment of 5 ° C for curing. According to GB / T19139-2012 main performance test method of cement slurry, the compressive strength of cement stone is tested. After 24 hours, the strength of cured cement is 3.6MPa, and after 48 hours, the strength of cured cement is 5.0MPa.

[0028] Wherein, the preparation method of the polymer-loaded organic component is as follows:

[0029] (1) Synthesis of prepolymer: Mix 0.9 g of styrene, 17.1 g of methyl methacrylate, and 12 g of toluene under a nitrogen atmosphere, slowly add 0.108 g of azobisisobutyronitrile, and then react at 60°C for 1.5 Hour. After the reaction is completed, it is terminated with hydroquinone and washed with methanol or a mixture of methanol and water to precipitate the prepolymer. Then dry at 40°C for 12 hours under vacuum condition to o...

Embodiment 2

[0033] 500 grams of oil well cement, 2 grams of polymer-loaded organic components, 5 grams of calcium chloride, and 220 grams of water were mixed at a high speed and placed in an environment of 5°C for curing. After 24 hours, the strength of the cured cement was 3.6 MPa, and after 48 hours, the strength of the cured cement was 4.9 MPa.

[0034] Wherein, the preparation method of the polymer-loaded organic component is as follows:

[0035] (1) Synthesis of prepolymer: Mix 1.5 g of styrene, 25 g of methyl methacrylate, and 30 g of toluene under nitrogen atmosphere, slowly add 0.2 g of azobisisobutyronitrile, and then react at 60°C for 5 Hour. After the reaction is completed, it is terminated with hydroquinone and washed with methanol or a mixture of methanol and water to precipitate the prepolymer. Then dry at 60°C for 4 hours under vacuum condition to obtain the obtained product.

[0036] (2) Under nitrogen protection, mix ethylene glycol dimethacrylate (250mg), toluene (250...

Embodiment 3

[0039] 500 grams of oil well cement, 2 grams of polymer-loaded organic components, 2 grams of calcium oxalate, 5 grams of bauxite, and 220 grams of water, mixed at a high speed, and placed in an environment of 5 ° C for curing. After 24 hours, the strength of the cured cement was 4.8 MPa, and after 48 hours, the strength of the cured cement was 8.0 MPa. Wherein, the preparation method of the polymer-loaded organic component is as follows:

[0040] (1) Synthesis of prepolymer: Mix 0.9 g of styrene, 17.1 g of methyl methacrylate, and 12 g of toluene under a nitrogen atmosphere, slowly add 0.108 g of azobisisobutyronitrile, and then react at 60°C for 1.5 Hour. After the reaction is completed, it is terminated with hydroquinone and washed with methanol or a mixture of methanol and water to precipitate the prepolymer. Then dry at 80°C for 4 hours under vacuum condition to obtain the obtained product.

[0041] (2) Under nitrogen protection, mix ethylene glycol dimethacrylate (250...

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Abstract

The invention relates to a polymer supported coagulant, a preparation method thereof and cement paste containing the polymer supported coagulant in the field of petroleum drilling and production. Thepolymer supported coagulant is prepared from a polymer supported organic component and inorganic matter in the weight ratio being 1:(0.1-100), preferably 1:(0.5-10). The polymer supported coagulant can be used as a cement coagulant for oil well cementation, particularly in a low-temperature environment. The polymer supported coagulant has good adaptability in the temperature range of 5-10 DEG C, has good dosage linearity, is compatible with multiple additive systems, has good compatibility, has the compressive strength larger than 3.5 MPa within 24 h for set cement and has no effects on comprehensive performance of the cement paste.

Description

technical field [0001] The invention relates to a polymer-type structural functional material additive in the field of petroleum drilling, and furthermore, relates to a polymer-loaded coagulant, a preparation method thereof, and cement slurry. Background technique [0002] Deep-sea resources have the characteristics of large reserves, high production capacity and high returns, which have attracted worldwide attention. However, deep-water drilling operations in waters deeper than 2000ft (609m) have the characteristics of high cost, high technology and high risk. Cementing technology is the prerequisite and important guarantee for efficient, economical and safe exploitation of oil and gas resources. At present, the cementing technology in the deepwater field is facing problems such as low temperature (below 4°C), narrow safe operation window, and shallow laminar flow, which restrict the development of deepwater cementing technology. In low temperature environment, the rheolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C08F265/04C08F222/14C04B24/26C04B28/00C04B103/12
CPCC04B28/00C04B40/0039C04B2103/12C04B2111/00724C04B2201/50C08F265/04C09K8/467C08F222/14C04B24/2688C04B24/121C04B22/14
Inventor 谭春勤陶谦周仕明魏浩光陈雷杨广国
Owner CHINA PETROLEUM & CHEM CORP
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