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Hydrophobic group grafted and modified guar gum fracturing fluid gel

A technology of hydrophobic group and graft modification, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of chemical modification of guar gum molecular structure characteristics that are not disclosed, and reduce efficiency and cost , the effect of reducing damage

Active Publication Date: 2010-01-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In U.S. Patent 6017855 published on January 25, 2000, and U.S. Patent 6383990 published on May 7, 2002, the inventors introduced CMG and CMHPG that can be used at low concentrations. The use concentration of this type of guar gum can be reduced to 0.12 %, the inventors of this patent called the guar gum they used a high yielding polymer, and did not disclose the molecular structure characteristics of this guar gum and how to chemically modify it

Method used

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  • Hydrophobic group grafted and modified guar gum fracturing fluid gel
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  • Hydrophobic group grafted and modified guar gum fracturing fluid gel

Examples

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Embodiment 1

[0048] This example describes the synthesis of tetrakis(2-hydroxypropyl)ethylenediamine zirconium chelate. Tetrakis(2-hydroxypropyl)ethylenediamine was chosen as the ligand for the zirconium ion. The polydentate ligand compound tetrakis (2-hydroxypropyl) ethylenediamine can be purchased from a professional reagent store, can also be synthesized from ethylenediamine and propylene oxide, and can also be synthesized from ethylenediamine and chloroethanol under alkaline conditions . A solution of tetra-n-propoxy zirconate in n-propanol (containing 20.7% Zr) was chosen as the source of zirconium ions.

[0049] In a 1000ml four-necked round-bottomed flask with a thermometer, dropping funnel and reflux device, add 400 grams of tetra-n-propoxy zirconate in n-propanol solution, and add 270.6 grams of triethanolamine with a content of 99.5% under stirring . The mixture was heated to 60°C and held there for 2 hours. Then 124.6 grams of tetrakis(2-hydroxypropyl)ethylenediamine and 84 ...

Embodiment 2

[0051] This example describes the synthesis of a lactate zirconate chelate. Choose cheap and easy-to-obtain lactic acid as the ligand of zirconium ion. Choose cheap and easy-to-obtain zirconium oxychloride as the source of zirconium ions.

[0052] In the four-neck round bottom flask that 1000ml has thermometer, dropping funnel and reflux device, add 368.6 grams of 30% zirconium oxychloride aqueous solution, add 40 grams of water under stirring. Gradually add 181.3 grams of 85% lactic acid at 20-30° C. under high-speed stirring. Stirring was continued for 1 hour after the addition was complete. Then use 25% sodium hydroxide aqueous solution to neutralize to pH 6.7~7.3. The mixture was then heated to 80°C for 4 hours. A transparent light yellow aqueous solution containing 5.4% Zr can be obtained. The product can be used as a cross-linking agent for guar fracturing fluid.

Embodiment 3

[0054] This example shows the preparation process of the fracturing fluid of the present invention and the jelly performance at low guar gum dosage. The guar gum that selects is the carboxymethyl hydroxypropyl guar gum CMHPG that is modified through hydrophobic group, and its product code is " guar gum JK-1002 ", provided by China Petroleum Kunshan Material Company, its C* Less than 0.07%. Unless otherwise specified below, this guar gum is still referred to as CMHPG. The product of Example 1 was used as a cross-linking agent after being stabilized by tetraethylenepentamine. The product code is "cross-linking agent FACM-37", provided by Langfang Branch of China Petroleum Exploration and Development Research Institute. Tetramethylammonium chloride was used as an anti-swelling agent.

[0055] The preparation process of the fracturing fluid base fluid with the formula of 0.15% CMHPG + 0.5% anti-swelling agent + 0.8% 10% NaOH + 0.5% drainage aid is as follows

[0056] In a high-s...

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Abstract

The invention relates to a hydrophobic group grafted and modified guar gum fracturing fluid gel which comprises the following components in percentage by weight in the fracturing fluid gel: 0.1-0.8 percent of hydrophobic group grafted and modified guar gum, 0.2-0.7 percent of expansion preventing agent and 0.1-1 percent of cross-linking agent and pH adjusting agent, wherein the dosage of the pH adjusting agent leads the pH value of fracturing fluid to be maintained between 9 and 13; the guar gum is a product obtained by guar gum carboxymethylation and methyl esterification and the amination of a multi-alkoxyamine compound with the molecular structure of CH3-(OCH2-CH2)x-(OCH2-CH(CH3))y-NH2; the expansion preventing agent is hyamine with the molecular weight smaller than 300 or polyquaternium with the molecular weight smaller than 50,000; the pH adjusting agent is sodium hydroxide or potassium hydroxide; the cross-linking agent is water-soluble chelate-acrylate copolymer stabilized by an ethylenediamine compound; and the hydrophobic group grafted and modified guar gum has low use concentration and the use temperature from normal temperature to 190 DEG C.

Description

field of invention [0001] The invention relates to a hydrophobic group graft-modified guar gum fracturing fluid jelly, which is used as a low-concentration guar gum fracturing fluid jelly for working fluid in hydraulic fracturing stimulation and transformation in exploration and development. Background technique [0002] The smooth production of oil and gas from a formation depends on many factors. These hydrocarbons usually must seep from the low permeability matrix to the bottom of the well. However, most of the currently explored and developed formations are low-permeability reservoirs with low yields, which must be reformed by fracturing and acidification to achieve the value of industrial exploitation. On the other hand, because the drilling fluid pollutes the reservoir near the wellbore during the drilling process, the production is lower than the real level of the reservoir. Hydraulic fracturing is one solution to increasing oil and gas production. [0003] During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08B37/18
Inventor 徐敏杰胥云崔明月管保山刘萍杨艳丽雷群丁云宏蒋廷学蒋建方杨振周王丽伟许志赫梁利
Owner PETROCHINA CO LTD
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