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A kind of modified xanthan gum thickener and its application in preparing fracturing fluid

A technology of xanthan gum and fracturing fluid, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of troublesome preparation of on-site liquid preparation, and achieve the effect of simple preparation process

Inactive Publication Date: 2017-07-14
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The application number is 201410075706.4, and the publication number is CN103805157A Chinese patent application for supramolecular biopolymer fracturing fluid, which discloses the use of xanthan gum, polyacrylamide, biological gum (xanthan gum, guar gum and carboxymethyl cellulose) Any one or a mixture of the three) is a thickening agent, and a supramolecular biological fracturing fluid is prepared by using the interaction between polymer molecular chains, but the preparation of the fracturing fluid requires three or more thickening agents. There are some troubles in the preparation of on-site liquid preparation

Method used

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  • A kind of modified xanthan gum thickener and its application in preparing fracturing fluid
  • A kind of modified xanthan gum thickener and its application in preparing fracturing fluid
  • A kind of modified xanthan gum thickener and its application in preparing fracturing fluid

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Effect test

Embodiment 1

[0034] The preparation of embodiment 1 modified xanthan gum powder

[0035] Add 250 parts of absolute ethanol and 50 parts of water into a four-neck flask, add 1 part of sodium hydroxide, and stir slowly. After the system is uniform, raise the temperature of the system to 75°C; add xanthan gum powder (Shanghai Runchuang Food Co., Ltd., food grade) 100 parts, stirred for 1 hour; then added 30 parts of etherification agent 1,2-propylene oxide and 0.5 parts of dodecyltrimethylammonium bromide, and reacted for 4 hours; the system was lowered in temperature, allowed to stand, washed and filtered, drying and crushing to obtain modified xanthan gum powder. The anhydrous ethanol or other organic solvents used in the reaction process and the washing process are all recycled (the above parts are parts by weight).

Embodiment 2

[0039] The preparation of embodiment 2 modified xanthan gum powder

[0040]Add 200 parts of absolute ethanol and 40 parts of water into a four-necked flask, add 0.8 parts of sodium hydroxide, and stir slowly. After the system is uniform, heat the system to 65°C; add xanthan gum powder (Shanghai Runchuang Food Co., Ltd., Food grade) 100 parts, stirred for 1 hour; then added 25 parts of etherification agent chloroethanol and 0.3 parts of cetyltrimethylammonium bromide, and reacted for 3 hours; the system was cooled down, left standing, washed and filtered, dried and pulverized to obtain Modified xanthan gum powder. The anhydrous ethanol or other organic solvents used in the reaction process and the washing process are all recycled (the above parts are parts by weight).

Embodiment 3

[0041] The preparation of embodiment 3 modified xanthan gum powder

[0042] Add 220 parts of anhydrous methanol and 40 parts of water into a four-necked flask, add 1 part of sodium hydroxide, and stir slowly. After the system is uniform, heat the system to 65°C; add xanthan gum powder (Shanghai Runchuang Food Co., Ltd., food grade) 100 parts, stirred for 1 hour; then added 10 parts of etherification agent chloroethanol, 20 parts of 1,2-propylene oxide and 0.5 parts of hexadecyltrimethylammonium bromide, and reacted for 4 hours; place, wash, filter, dry, and pulverize to obtain modified xanthan gum powder. The anhydrous ethanol or other organic solvents used in the reaction process and the washing process are all recycled (the above parts are parts by weight).

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Abstract

The invention relates to a modified xanthan gum thickener, a preparation method thereof, a low-concentration non-crosslinked xanthan gum fracturing fluid and a preparation method of the fracturing fluid, and belongs to the technical fields of oilfield chemical substance development and oil gas fracturing exploitation. The above modified xanthan gum mainly includes, by weight, 100 parts of xanthan gum powder, 0.5-2 parts of an inorganic alkali, 40-80 parts of water, 200-300 parts of organic alcohol, 20-50 parts of an etherifying agent and 0.1-1 part of a phase transfer catalyst. The invention also relates to the preparation method of the low-concentration non-crosslinked xanthan gum fracturing fluid. The low-concentration non-crosslinked xanthan gum fracturing fluid comprises, by mass, 0.15-0.6 parts of the modified xanthan gum, 1-2 parts of potassium chloride and 100 parts of water. The preparation method of the modified xanthan gum is simple and is suitable for industrialized production, and the modified xanthan gum for can reduce the dosage of the xanthan gum when used in the fracturing fluid in order to reduce the cost.

Description

technical field [0001] The invention relates to a method for modifying a fracturing thickener and preparing a fracturing fluid in an oil and gas field, and belongs to the key technical field of oil field chemical development and oil and gas fracturing development. Background technique [0002] Hydraulic fracturing technology is a commonly used measure in the exploration and development of oil and gas layers. Viscous or gel-like fracturing fluid is pumped into the oil and gas layers through the surface high-pressure pump set to form a fracture network in the formation, improve the reservoir, and increase the production of oil and gas layers. [0003] At present, in the process of hydraulic fracturing, the most commonly used fracturing fluids are mainly cross-linked fracturing fluid, non-cross-linked xanthan gum fracturing fluid and clean fracturing fluid. According to the field fracturing results, cross-linked type The fracturing fluid has problems such as incomplete gel brea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C08B37/00
CPCC09K8/665C09K8/68C09K8/90
Inventor 方波田萌金雷平卢拥军邱晓慧陈洁郁丽程马明
Owner EAST CHINA UNIV OF SCI & TECH