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Modified cellulosic cross-linked copolymer and gel, composition and application thereof

A cross-linked copolymer and cellulose technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor salt resistance, poor temperature resistance, low strength, etc., and achieve high strength and high strength. Effects of adhesion, high temperature and salt resistance

Inactive Publication Date: 2019-05-21
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a gel system for drilling, which has defects such as low strength, weak adhesion, uncontrollable crosslinking time, poor temperature resistance and salt resistance. Modified cellulose-based cross-linked copolymers and gels with higher strength, higher adhesion, controllable cross-linking time, and higher temperature and salt resistance properties, and their compositions and applications can be formed

Method used

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  • Modified cellulosic cross-linked copolymer and gel, composition and application thereof

Examples

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preparation example Construction

[0036] According to the present invention, the modified cellulose is as described above, wherein, preferably, the preparation method of the modified cellulose is characterized in that the method comprises:

[0037] (1) mixing the cellulose compound with an aqueous alkaline solution and performing dialysis to obtain a dialysis residue and drying;

[0038] (2) Under an inert atmosphere, in the presence of a catalyst, the above-mentioned dry product and the acrylamide monomer represented by formula (1') are polymerized in water,

[0039] Formula 1') Among them, R 1 and R 1' each independently selected from H and C1-C6 alkyl;

[0040] Wherein, based on the weight of the modified cellulose, the amount of the acrylamide monomer represented by the formula (1') makes the content of the acrylamide polymer chain grafted on the modified cellulose 4.5- 25% by weight.

[0041] Among them, the acrylamide monomer represented by formula (1') can be appropriately selected according to th...

preparation example 1

[0060] This preparation example is used to illustrate the modified cellulose of the present invention and its preparation method.

[0061] (1) At 60°C, 10g sodium carboxymethylcellulose (purchased from Baoding Huarui Chemical Co., Ltd., molecular weight is 150,000-200,000g / mol) was added to 100g of 18% by weight NaOH solution and mixed for 30min to obtain The mixed solution was put into a dialysis bag, and the dialysis operation was carried out. After 3 days of dialysis, the solution in the dialysis bag was dried and granulated to obtain a white powder.

[0062] (2) Stir, mix and dissolve 100g of distilled water, 4.5g of the above white powder and 0.5g of acrylamide, then heat to 60°C with nitrogen for 30min, then add 20mg of Ce(SO 4 ) 2 , continue to react at 60° C. for 5 h, and cool down after the reaction to obtain modified cellulose solution A1 (concentration: 5% by weight).

[0063] As measured by the light scattering method, the modified cellulose had a weight average ...

preparation example 2

[0065] This preparation example is used to illustrate the modified cellulose of the present invention and its preparation method.

[0066] According to the method described in Preparation Example 1, the difference is that step (2) includes: stirring and dissolving 100 g of distilled water, 4 g of the above-mentioned white powder, and 1 g of acrylamide, and then heating to 70° C., and then keeping the temperature for 30 min with nitrogen gas, and then pouring into the solution Add 20mg of Ce(SO 4 ) 2 , continue to react at 70° C. for 3 h, and cool down after the reaction to obtain modified cellulose solution A2 (concentration: 5% by weight).

[0067] As measured by the light scattering method, the modified cellulose has a weight average molecular weight of 250,000 g / mol, a molecular weight distribution coefficient of 2.1, and a content of acrylamide polymer chains of 11.1% by weight.

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Abstract

The invention relates to the field of oil and gas exploration and production plugging, in particular to a modified cellulose crosslinking copolymer and gel and a composition and an application thereof. The modified cellulose crosslinkingcopolymer is composed of a crosslinking structure center and a graft polymerization chain grafted on the center of the crosslinking structure, wherein the center of the crosslinking structure is provided by a phenolic resin, The graft polymerization chain is provided by the modified cellulose and the content of graft polymerization chain in the crosslinking copolymer is 50-90 weight %. The gel is prepared by controling gelation time under certain conditions by using the composition, thereby forming a gel containing the modified cellulose crosslinking copolymer. The gel is characterized by high strength, high adhesion, high resistance to salt and salinity, which is beneficial to oil and gas exploration and production.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and plugging, in particular to a modified cellulose-based cross-linked copolymer and gel as well as its composition and application. Background technique [0002] Polymer solutions and some sols, under proper conditions, the whole system will transform into a thick substance in an elastic semi-solid state, lose fluidity and form a gel. Among them, smart gel is a kind of gel, which has a wide range of applications in the field of oil field chemistry. Smart gel can be used for drilling, workover and profile control and water plugging, and its application in drilling is mainly reflected in snubbing operations. Snubbing operation is to complete operations such as tripping drilling tools, coring under pressure, logging, and running screens under the condition of under-balanced formation. This technology can further protect and maintain the original state of the formation, prevent reservoir pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F251/02C08F220/56C08J3/075C09K8/035C09K8/512
CPCC08F251/02C08G81/024C08J3/075C08J2387/00C09K8/035C09K8/512C08F220/56
Inventor 于培志王德有于铁峰赵宇光庄照锋肖绪玉李国楠
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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