Gel cement, associated polymer and preparation method

Abstract

The invention discloses gel cement, an associated polymer and a preparation method. The gel cement comprises the following components in parts by weight: 0.6-2 parts of associated polymer and 100 parts of cement; wherein the associated polymer is prepared by carrying out polymerization reaction on reaction monomers consisting of 10 to 50 percent of acrylamide, 10 to 20 percent of sodium acrylate,10 to 20 percent of N-vinyl-2-pyrrolidone, 20 to 50 percent of 2-acrylamido-2-methylpropanesulfonic acid and 5 to 10 percent of a hydrophobic monomer in percentage by mole; the gel cement has high-temperature-resistant gelling capacity, the high-temperature gelling phenomenon can be effectively eliminated, and after the gel cement is prepared into cement paste, the paste is high in structural force and has excellent anti-flushing capacity and residence capacity.

Description

technical field

[0001] The invention relates to the technical field of chemical engineering, in particular to a gel cement, an association polymer and a preparation method. Background technique

[0002] Lost circulation refers to the leakage of various working fluids, including mud, cement slurry, completion fluid and other liquids, into the formation under the action of pressure difference during special downhole operations such as drilling, cementing, testing or workover. A downhole complex situation is one of the most common technical problems in downhole engineering.

[0003] In order to solve the problem of well leakage, the main idea in the existing technology is to inject a plugging material into the leaky layer to seal the leaky layer, thereby solving the plugging problem. At present, the existing plugging materials mainly include: 1) polymers, resins, and sediments, which have the problems of low strength and insufficient temperature resistance after the plugging s...

Examples

Embodiment 1

[0038] A gel cement:

[0039] It includes: 2.6g of associative polymer and 200g of cement; the cement is Sichuan Jiahua superfine cement with a particle size of 20 microns.

[0040] The aforementioned associative polymers:

[0041] In mole percent, the associative polymer consists of 35% acrylamide, 15% sodium acrylate, 12% N-vinylpyrrolidone, 30% 2-acrylamido-2-methylpropanesulfonic acid and 8 hydrophobic monomers. The reaction monomer polymerization reaction of % composition is obtained; Described hydrophobic monomer is the compound shown in formula I;

[0042]

[0043] Among them, n=11; X - for chloride ions.

[0044] The preparation method of above-mentioned gel cement:

[0045] It comprises: adding the associative polymer and the cement into a mixer and fully stirring, and mixing evenly to prepare the obtained product.

[0046] The preparation method of above-mentioned associative polymer:

[0047] include:

[0048] The sodium hydroxide adjustment system adjusts t...

Embodiment 2

[0054] The difference between this embodiment and embodiment 1 is only:

[0055] A gel cement:

[0056] Comprising: 2.2g of associative polymer and 200g of cement; the cement is Sichuan Jiahua superfine cement (commercially available) with a particle size of 20 microns.

Embodiment 3

[0058] The difference between this embodiment and embodiment 1 is only:

[0059] A gel cement:

[0060] Comprising: 3g of associative polymer and 200g of cement; the cement is Sichuan Jiahua G grade oil well cement (commercially available).

technical field

[0001] The invention relates to the technical field of chemical engineering, in particular to a gel cement, an association polymer and a preparation method. Background technique

[0002] Lost circulation refers to the leakage of various working fluids, including mud, cement slurry, completion fluid and other liquids, into the formation under the action of pressure difference during special downhole operations such as drilling, cementing, testing or workover. A downhole complex situation is one of the most common technical problems in downhole engineering.

[0003] In order to solve the problem of well leakage, the main idea in the existing technology is to inject a plugging material into the leaky layer to seal the leaky layer, thereby solving the plugging problem. At present, the existing plugging materials mainly include: 1) polymers, resins, and sediments, which have the problems of low strength and insufficient temperature resistance after the plugging s...

Examples

Embodiment 1

[0038] A gel cement:

[0039] It includes: 2.6g of associative polymer and 200g of cement; the cement is Sichuan Jiahua superfine cement with a particle size of 20 microns.

[0040] The aforementioned associative polymers:

[0041] In mole percent, the associative polymer consists of 35% acrylamide, 15% sodium acrylate, 12% N-vinylpyrrolidone, 30% 2-acrylamido-2-methylpropanesulfonic acid and 8 hydrophobic monomers. The reaction monomer polymerization reaction of % composition is obtained; Described hydrophobic monomer is the compound shown in formula I;

[0042]

[0043] Among them, n=11; X - for chloride ions.

[0044] The preparation method of above-mentioned gel cement:

[0045] It comprises: adding the associative polymer and the cement into a mixer and fully stirring, and mixing evenly to prepare the obtained product.

[0046] The preparation method of above-mentioned associative polymer:

[0047] include:

[0048] The sodium hydroxide adjustment system adjusts t...

Embodiment 2

[0054] The difference between this embodiment and embodiment 1 is only:

[0055] A gel cement:

[0056] Comprising: 2.2g of associative polymer and 200g of cement; the cement is Sichuan Jiahua superfine cement (commercially available) with a particle size of 20 microns.

Embodiment 3

[0058] The difference between this embodiment and embodiment 1 is only:

[0059] A gel cement:

[0060] Comprising: 3g of associative polymer and 200g of cement; the cement is Sichuan Jiahua G grade oil well cement (commercially available).

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