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High-temperature sea water-base fracturing liquid suitable for formation temperature of 160 DEG C and preparation method thereof

A technology of high-temperature seawater and base pressure, applied in chemical instruments and methods, compounds of group 4/14 elements of the periodic table, and drilling compositions, can solve problems such as difficulty in meeting the requirements of fracturing construction, and achieve reduction Effects of injury, good tolerance, good complexation

Active Publication Date: 2013-06-05
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used water-based fracturing fluid thickeners are more or less affected by seawater components and cannot meet the requirements of fracturing operations.

Method used

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  • High-temperature sea water-base fracturing liquid suitable for formation temperature of 160 DEG C and preparation method thereof
  • High-temperature sea water-base fracturing liquid suitable for formation temperature of 160 DEG C and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] High temperature seawater based fracturing fluid

[0034] Raw materials (by weight):

[0035] 96 parts of sea water;

[0036] Thickener (hydroxyethyl carboxymethylsulfonate guar gum) 0.5 parts;

[0037] Chelating regulator (a mixed aqueous solution of ethylenediaminetetraacetic acid and hydroxyethylidene diphosphoric acid, wherein the weight percentage of ethylenediaminetetraacetic acid is 21%, the weight percent of hydroxyethylidene diphosphoric acid is 32%, and the balance is water, Both ethylenediaminetetraacetic acid and hydroxyethylidene diphosphate were purchased from Beijing Dewei Na Biotechnology Co., Ltd.) 1.5 parts;

[0038] Temperature stabilizer (mixed aqueous solution of hydroxylamine hydrochloride and sodium thiosulfate, wherein the weight percent of hydroxylamine hydrochloride is 12%, the weight percent of sodium thiosulfate is 21%, and the balance is water, hydroxylamine hydrochloride and sodium thiosulfate are purchased from Beijing Dewei Na Biotech...

Embodiment 2

[0068] High temperature seawater based fracturing fluid

[0069] Raw materials (by weight):

[0070] Seawater 97.5 parts;

[0071] Thickener (hydroxyethylcarboxymethylsulfonate guar gum) 0.75 parts;

[0072] Chelation regulator (mixed aqueous solution of 2-phosphonic acid butane-1,2,4-tricarboxylic acid and triethylenetetramine hexaacetic acid hexasodium, in which 2-phosphonic acid butane-1,2,4-tricarboxylic acid 8% by weight of acid, 12% by weight of hexasodium triethylenetetraminehexaacetate, the balance is water, 2-phosphonobutane-1,2,4-tricarboxylic acid and triethylenetetramine Hexasodium hexaacetate was purchased from Beijing Dewei Na Biotechnology Co., Ltd.) 0.8 part;

[0073] Temperature stabilizer (mixed aqueous solution of hydrazine hydrate and sodium sulfite, wherein the weight percentage of hydrazine hydrate is 15%, the weight percentage of sodium sulfite is 5%, and the balance is water. Both hydrazine hydrate and sodium sulfite are purchased from Beijing Dewei ...

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Abstract

The invention relates to high-temperature sea water-base fracturing liquid suitable for the formation temperature of 160 DEG C. The high-temperature sea water-base fracturing liquid is prepared by reacting base liquid and a crosslinking agent, wherein the base liquid comprises the following raw materials in parts by weight: 96-98 parts of sea water, 0.5-1.0 part of a thickening agent, 0.8-1.5 parts of a chelated regulator, 0.3-1.0 part of a temperature stabilizing agent, 0.1-0.5 parts of a surfactant, 0.01-0.05 part of a gel breaker and 0.5-1.5 parts of a crosslinking agent. The application further relates to a preparation method of the high-temperature sea water-base fracturing liquid. The high-temperature sea water-base fracturing liquid has good compatibility with sea water, excellent tolerance and complexation property for various high-valent and variable-valent metal ions, such as Ca<2+>, Mg<2+> and Fe<3+> in sea water, and is capable of overcoming or reducing harm caused by secondary precipitation.

Description

technical field [0001] The present application relates to a seawater-based fracturing fluid, more specifically, to a high-temperature seawater-based fracturing fluid suitable for a formation temperature of 160°C and a preparation method thereof. Background technique [0002] The existing fracturing fluids are prepared with fresh water, but for offshore oil fields, due to the influence of space, transportation, cost and other factors, the supply of fresh water resources is difficult to meet the needs of oil field fracturing reconstruction. For offshore oil fields, seawater is a ubiquitous and easily available water resource. However, since seawater is a complex water system, which contains dozens of mineral elements and a variety of organic matter, it is a high-salt, multi-component water system. Currently commonly used water-based fracturing fluid thickeners are more or less affected by seawater components and cannot meet the requirements of fracturing operations. [0003]...

Claims

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Application Information

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IPC IPC(8): C09K8/68C07F7/00C07F7/28C08B37/00
Inventor 刘刚芝王杏尊鲍文辉罗勇郭士生郭布民张海山李三喜彭雪飞蔡依娜
Owner CHINA NAT OFFSHORE OIL CORP
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