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A kind of branched polymer and its preparation method and application

A technology of branched polymers and polymers, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of improving technical means, huge market value, and good leakage prevention and plugging effects

Active Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the use of branched polymer as a plugging agent

Method used

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  • A kind of branched polymer and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] (1) Prepare A1 substance and B1 substance:

[0104] Substance A1 is ethylenediamine, molecular formula C 2 H 8 N 2 , i=2, j=0, the total amount of basic groups is x=2, and it is liquid at room temperature.

[0105] Substance B1 is 1,2,4-cyclohexanetricarboxylic acid anhydride, molecular formula C 9 H 10 O 5 , m=1, n=1, the total amount of acidic groups is y=3, and it is solid at room temperature. 1 / 3 mol of B1 substance was dissolved in DMF to prepare a 1M (mol / L) solution containing B1 substance (mixture containing B1 substance).

[0106] (2) Slowly add 0.2167 mol (a is 1.3, then 1.3 / 6 mol) of A1 substance into the solution containing B1 substance, control the dropwise temperature in an ice-water bath, and stir for 0.5 hours in an ice-water bath environment (0°C). During the period, nitrogen atmosphere was maintained after removing air and water vapor through nitrogen. The temperature was gradually raised to 60°C with stirring, and the reaction was carried out ...

Embodiment 2

[0110] (1) Prepare A2 substance and B2 substance:

[0111] Substance A2 is diethanolamine, molecular formula C 4 H 11 NO 2 , i=1, j=2, the total amount of basic groups is x=3, and it is liquid at room temperature.

[0112] Substance B2 is dodecanedioic acid, molecular formula C 12 H 22 O 4 , m=2, n=0, the total amount of acidic groups is y=2, and it is liquid at room temperature.

[0113] (2) Slowly add 0.1167mol (b is 0.7, then 0.7 / 6mol) of A2 substance into 0.5mol (1 / 2mol) of B2 substance, control the dropwise temperature in an ice-water bath, and stir for 1.5 hours in an ice-water bath environment , during which nitrogen atmosphere was maintained after removing air and water vapor through nitrogen. 0.01 mol of KOH (basic catalyst) was added, the temperature was gradually increased to 160°C under stirring, and the reaction was carried out for 4.5 hours to obtain a prepolymer.

[0114] (3) Add 0.1167mol (b is 0.7, then 0.7 / 3-0.7 / 6=0.7 / 6mol) A2 substance under stirring...

Embodiment 3

[0117] (1) Prepare A3 substance and B3 substance:

[0118] Substance A3 is 1,3-cyclohexanedimethylamine, molecular formula C 8 H 18 N 2 , i=2, j=0, the total amount of basic groups is x=2, it is liquid at normal temperature, and it is liquid at normal temperature.

[0119] Substance B3 is 1,2,3,4-cyclopentanetetracarboxylic dianhydride, molecular formula C 9 H 6 O 6 , m=0, n=2, the total amount of acidic groups is y=4, and it is solid at room temperature. Dissolve 1 / 4 mol of B3 in DMF to make a 1M solution containing B3.

[0120] (2) 0.375mol (a is 1.5, then 1.5 / 4mol) A3 substance is slowly added to the solution containing B3 substance, the temperature of dropwise addition is controlled in an ice-water bath, and stirred for 0.5 hours in an ice-water bath environment, during which nitrogen is removed to remove A nitrogen atmosphere was maintained after air and water vapor. The temperature was gradually raised to 100°C with stirring, and the reaction was carried out for ...

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Abstract

The invention discloses a branched polymer and its preparation method and application. The polymer contains the product obtained by the reaction of substance A and substance B, and substance A is a substance containing a basic group and R 1 The compound of group, wherein, described basic group is selected from -NH 2 , ‑NH‑ and ‑OH: where ‑NH 2 The total number of and‑NH‑ is i, and the total number of‑OH is j, j≥0, x=i+j≥2; Substance B contains acidic groups and R 2 The compound of group, wherein, described acid group is -COOH and / or acid anhydride group, wherein, the total number of -COOH is m, the total number of acid anhydride group is n, n≥0, y=2n +m≥2; and, x+y≥5, j+n≥1, and j×n=0. The polymer of the present invention is used as a drilling fluid plugging agent, and is compounded to form a plugging slurry system, which has good high temperature fracture plugging ability.

Description

technical field [0001] The invention belongs to the field of leakage prevention and plugging of drilling fluids in oil drilling, in particular to a branched polymer and a preparation method and application thereof. Background technique [0002] Loss of circulation is a major bottleneck restricting drilling speedup, and it accounts for the highest proportion of all complex downhole processing time for a single project. A lot of research has been carried out at home and abroad, and a variety of plugging materials such as biological plugging agents and gel plugging agents have been developed. Although this type of material is cheap and has a wide selection of raw materials, it is easily degraded at high temperature, resulting in formation re-leakage. The above problems are especially prominent in high temperature deep wells. For the leakage of high temperature wells above 150°C, there is a lack of long-term effective technical means. [0003] At present, the high temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C09K8/035C09K8/42
CPCC08G73/028C09K8/035C09K8/426
Inventor 赵金洲李舟军杨小华李大奇钱晓琳刘金华宋碧涛宣扬王琳李凡
Owner CHINA PETROLEUM & CHEM CORP
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