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Butane-containing fracturing fluid and preparation method thereof

A technology of fracturing fluid and butane, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that cannot satisfy the research of LPG fracturing fluid, and achieve improved fracturing effect, good viscoelasticity, good The effect of heat resistance

Active Publication Date: 2013-12-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there are many advantages in using liquefied LPG as a fracturing fluid, because LPG is in a gaseous state under normal conditions, the existing technology only provides a technology for liquefied fracturing operations under pressurized conditions. Due to limitations such as insufficient safety protection measures, conventional fracturing fluid preparation, experimental evaluation and other methods cannot meet the research needs of LPG fracturing fluids.

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  • Butane-containing fracturing fluid and preparation method thereof
  • Butane-containing fracturing fluid and preparation method thereof

Examples

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Embodiment 1

[0035] This embodiment provides a fracturing fluid containing butane, in parts by mass, its raw material composition includes:

[0036] Phosphate ester thickener 0.5 parts;

[0037] 0.25 parts of sodium metaaluminate;

[0038] Butane 100 parts.

[0039] The phosphate ester thickener in this example is a dialkyl phosphate ester composed of a short-chain alkyl group (C1-C4) and a medium-length carbon chain alkyl group (C5-C7), which is prepared according to the following method: In a 250mL four-necked flask equipped with a mechanical stirrer, a condenser, and a thermometer, make P 2 o 5 With triethyl phosphate at a molar ratio of 1:1, react at 90°C for 6 hours to obtain a polyphosphate intermediate, and then add butanol (the butanol and P 2 o 5 The molar ratio is 5:2), and then heated to 125 ° C for 6 hours to obtain a light yellow liquid, which is the dialkyl phosphate (phosphate thickener) of this example.

[0040] The fracturing fluid containing butane of this embodimen...

Embodiment 2

[0046] This embodiment provides a fracturing fluid containing butane, in parts by mass, its raw material composition includes:

[0047] Phosphate ester thickener 0.8 part;

[0048] 0.8 parts of sodium metaaluminate;

[0049] Sodium salicylate 0.1 part;

[0050] 100 parts of butane;

[0051] The phosphate thickener in this embodiment is the same as the phosphate thickener in Example 1.

[0052] The fracturing fluid containing butane of this embodiment is prepared according to the following method:

[0053] (1) Put the butane gas tank, pressure container, magnetic stirring rod, beaker and other instruments in a low-temperature cabin at -10°C to -15°C for 45 minutes to ensure that the butane temperature in the butane gas tank drops to the boiling point- below 5°C, and ensure that the temperature of all instruments in contact with liquid butane is below -5°C;

[0054] (2) Take out the liquid butane in the butane gas tank in the low-temperature cabin of -10°C to -15°C and put ...

Embodiment 3

[0058] This embodiment provides a fracturing fluid containing butane, in parts by mass, its raw material composition includes:

[0059]

[0060] The phosphate thickener in this embodiment is the same as the phosphate thickener in Example 1.

[0061] The fracturing fluid containing butane of this embodiment is prepared according to the following method:

[0062] (1) Put the butane gas tank, pressure container, magnetic stirring rod, beaker and other instruments in a low-temperature cabin at -10°C to -15°C for 45 minutes to ensure that the butane temperature in the butane gas tank drops to the boiling point- below 5°C, and ensure that the temperature of all instruments in contact with liquid butane is below -5°C;

[0063] (2) Take out the liquid butane in the butane gas tank in the low-temperature cabin of -10°C to -15°C and put it into a pressure-resistant container;

[0064] (3) Add phosphate ester thickener (stored in a beaker stored in a low-temperature cabin), citric a...

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Abstract

The invention provides a butane-containing fracturing fluid and a preparation method thereof. The butane-containing fracturing fluid comprises the raw materials in parts by mass: 0.5 to 2 parts of a phosphate thickening agent, 0.1 to 1 part of a crosslinking agent and 100 parts of butane. The preparation method of the butane-containing fracturing fluid comprises the following steps: gaseous butane is placed in an environment of -10 DEG C to -30 DEG C, and the gaseous butane is changed into liquid butane; at the temperature of -10 DEG C to -30 DEG C, water solutions of the phosphate thickening agent and the cross-linking agent are added to the liquid butane and are stirred evenly, and an initial product of the butane-containing fracturing fluid is obtained; at the room temperature and in a pressure-resistance air tight container, the initial product of the butane-containing fracturing fluid is magnetically stirred for 10 min, and the butane-containing fracturing fluid is obtained. The butane-containing fracturing fluid can be prepared under the normal pressure, and has relatively good temperature resistance, shear resistance and sand carrying performance.

Description

technical field [0001] The invention relates to a butane-containing fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas field development in the field of petroleum exploitation. Background technique [0002] Water-based fracturing fluid has been used as the main fracturing fluid technology for nearly a hundred years. However, with the continuous development of ultra-low permeability reservoirs, especially unconventional reservoirs, water-based fracturing fluids often encounter water failure caused by phase traps. Phenomena such as retention and low flowback rate lead to problems such as rapid decline in production after fracturing and ineffective increase in production. At the same time, the contradiction between large-scale hydraulic fracturing and the current shortage of water resources has also led many people in the industry to consider non-hydraulic fracturing as a reconstruction technology. Alternatives to hydraulic fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/64
Inventor 崔伟香卢拥军管保山邱晓惠程兴生王丽伟侯向前王春鹏
Owner PETROCHINA CO LTD
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