Seawater-based oil gas well fracturing fluid

A technology for oil and gas wells and fracturing fluids, which is applied in the field of fracturing fluids to achieve the effects of reducing damage, inhibiting clay expansion, and good shear resistance

Inactive Publication Date: 2012-02-29
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a technology for directly using seawater to prepare fracturing fluid for the production stimulation of offshore high-temperature reservoirs. The comprehensive performance evaluation shows that the fractur

Method used

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  • Seawater-based oil gas well fracturing fluid

Examples

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preparation example Construction

[0026] Preparation of thickener

[0027] Put a 250mL four-necked flask equipped with a nitrogen device and a stirrer in a constant temperature water bath, add 100mL of distilled water, add 10-20 parts of acrylamide, stir to dissolve, add 3-10 parts of dimethyl diallyl chloride ammonium, 1-5 parts of vinylpyrrolidone, 1-4 parts of maleic acid, use 10% sodium hydroxide solution as a pH adjuster, adjust the pH of the system to between 7 and 8, pass nitrogen to remove oxygen, add 5% ammonium persulfate solution was used as the initiator. Continue to blow nitrogen, raise the temperature of the water bath to 40-45°C, and continue the reaction in the constant temperature water bath for 10-24 hours to obtain a viscous liquid, which is precipitated with absolute ethanol, washed three times, and then vacuum-dried at 60°C to constant weight.

Embodiment 1

[0029] Take 100 parts of 10% salt water, add 0.6 parts of thickener under stirring, add 0.3 parts of drainage aid (non-ionic surfactant OP-10), 3 parts of organometallic composite cross-linking agent, capsule form 0.03 part of ammonium persulfate was added and mixed to prepare the fracturing fluid of the present invention.

[0030] The organometallic composite crosslinking agent is prepared by zirconium oxychloride, tartaric acid and water according to the mass ratio of 1:0.5:3, and the pH value is adjusted to 6.5 with triethanolamine.

Embodiment 2

[0031] Example 2: Take the formation water from the Ordos Basin, add 1.2 parts of the thickener to 100 parts of the formation water after removing oil and suspended solids under stirring, wherein the salinity of the formation water is 7.8×10 4 mg / L, after dissolving, add 0.2 part of drainage aid (polyoxyethylene perfluorooctyl ether-14), 8 parts of organometallic composite crosslinking agent, and 0.1 part of ammonium persulfate in the form of capsule, add and mix to prepare Obtain the fracturing fluid of the present invention.

[0032] Organometallic composite cross-linking agent: mix 2 parts of ferric chloride and 1 part of aluminum chloride, add 1 part of tartaric acid, 0.5 parts of sodium gluconate, 6 parts of water, and adjust the pH value to 7 with triethanolamine.

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Abstract

The invention discloses fracturing fluid directly prepared from seawater. The fracturing fluid consists of the following components in part by weight: 0.3 to 2.0 parts of thickening agent, 1.0 to 8.0 parts of organic metal composite crosslinking agent, 0.2 to 0.6 part of discharge aiding agent, 0.01 to 0.3 part of gel breaker and 100 parts of seawater. The fracturing fluid is directly prepared from the seawater without fresh water, so the problem of water source for marine platform fracturing construction is solved; the seawater mineralization degree is high, so clay swelling of a storage layer can be effectively inhibited; and an encapsulated gel breaker is adopted, so high viscoelasticity of the fracturing fluid in the fracturing construction period is guaranteed, the gel of the fracturing fluid is broken completely after construction, the fracturing fluid flows back timely, damage to the storage layer is reduced, and an expectant yield-increasing effect is achieved.

Description

technical field [0001] The invention relates to a fracturing fluid used in the exploitation of offshore oil and gas fields, in particular to a fracturing working fluid which directly uses seawater to prepare the fracturing fluid and is applied to the fracturing of high-temperature reservoirs at 160°C. Background technique [0002] With the continuous expansion and deepening of the oil and gas exploration process, the development of offshore oil and gas fields has become a very important part of oil and gas development. my country's sea areas are rich in oil and gas resources, but they are buried deep and belong to high-temperature and ultra-high-temperature reservoirs. Generally, fracturing is required to increase and stabilize production. High temperature fracturing fluid is one of the core technologies for reservoir fracturing. [0003] Fracturing fluid is a working fluid for fracturing construction, which is used to transfer energy, fracture oil and gas layers, and trans...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 谢志海刘宇将文学蔡清
Owner NORTHWEST UNIV
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