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Method for continuously blending fracturing fluid by utilizing sea water

A fracturing fluid and seawater technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as restricting offshore fracturing

Inactive Publication Date: 2013-09-18
湖北菲特沃尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing technology, because the fracturing fluid needs to use clean water, a large amount of clean water needs to be transported from land to the offshore construction site
However, limited by offshore construction conditions and resources, the cost and preparation methods of fracturing fluids have seriously restricted the development of offshore fracturing, especially large-scale fracturing.

Method used

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  • Method for continuously blending fracturing fluid by utilizing sea water

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment example 1

[0051] Preparation of cross-linking agent: Add 550 kg of clear water into a container with a stirrer, start the stirrer, then add 150 kg of mannitol, 200 kg of borax, and 100 g of caustic soda, stir until the three are completely dissolved and set aside.

[0052] Using the "fracturing fluid continuous mixing device", the seawater is mixed with 2.0m 3 The flow injection per minute enters "in the jet mixer" and forms negative pressure, and the oligomeric ether instant guar gum is mixed with seawater in "in the jet mixer" through negative pressure suction at an addition speed of 6.0 kg / min. When the mixed liquid passes through the "multi-chamber single-channel tank", use the metering pump equipped on the "fracturing fluid continuous mixing device" to pump the antiscalant at a flow rate of 20.0 L / min and the surfactant at a flow rate of 4.0 L / min. mix. The mixed fluid flows out of the "fracturing fluid continuous mixing device" and is pumped to the sand mixing tank of the fractur...

specific Embodiment example 2

[0055] Preparation of cross-linking agent: Add 500 kg of clear water into a container with a stirrer, start the stirrer, then add 200 kg of mannitol, 200 kg of borax, and 100 g of caustic soda, stir until the three are completely dissolved and set aside.

[0056] Using the "fracturing fluid continuous mixing device", the seawater is mixed with 2.5m 3The flow injection per minute enters "in the jet mixer" and forms negative pressure, and the oligomeric ether instant guar gum mixes with seawater in "in the jet mixer" through negative pressure suction at an addition speed of 10.0 kg / min. When the mixed liquid passes through the "multi-chamber single-channel tank", use the metering pump equipped on the "fracturing fluid continuous mixing device" to pump the antiscalant at a flow rate of 25.0 liters / min and the surfactant at a flow rate of 5.0 liters / min. mix. The mixed fluid flows out of the "fracturing fluid continuous mixing device" and is pumped to the sand mixing tank of the ...

specific Embodiment example 3

[0059] Preparation of cross-linking agent: Add 400 kg of water into a container with a stirrer, start the stirrer, then add 200 kg of mannitol, 200 kg of borax, and 200 g of caustic soda, stir until the three are completely dissolved and set aside.

[0060] Using the "fracturing fluid continuous mixing device", the seawater is mixed with 3.0m 3 The flow injection per minute enters "in the jet mixer" and forms negative pressure, and the oligomeric ether instant guar gum mixes with seawater in "in the jet mixer" through negative pressure suction at an addition speed of 16.5 kg / min. When the mixed liquid passes through the "multi-chamber single-channel tank", use the metering pump equipped on the "fracturing fluid continuous mixing device" to pump the scale inhibitor at a flow rate of 30.0 liters / minute and the surfactant at a flow rate of 6.0 liters / minute. mix. The mixed fluid flows out of the "fracturing fluid continuous mixing device" and is pumped to the sand mixing tank of...

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Abstract

The invention discloses a method for continuously blending fracturing fluid by utilizing sea water. The method comprises the following steps of: jetting flow of sea water into a 'jet mixer' to form negative pressure at the flow of 100 c (c is unit volume fraction) by utilizing a 'continuous blending device of fracturing fluid'; sucking low- polyether instant guar gum through negative pressure according to 0.25-0.8% (parts by weight) of volume of the sea water to mix with the sea water in the 'jet mixer'; pumping and mixing an antisludging agent with a surfactant according to the volume fractions of 0.25-2.0% and 0.1-1.0% of volume of the sea water when the mixing solution passes through a 'multi-cavity single-channel tank'; adding a crosslinking agent to a sand mixing tank according to 0.1-2.0% (volume fraction) of volume of the sea water and 0.001-0.1% (parts by weight) of volume of the sea water to evenly mix and then pumping to a main press of a fracturing unit, so as to achieve fracturing construction when the mixing solution flows out of the 'continuous blending device of the fracturing liquid' and is pumped to the sand mixing tank of a fracturing blender truck.

Description

[0001] technical field [0002] [0003] The invention relates to a method for preparing water-based fracturing fluid used in the fracturing and stimulation process of oil wells or natural gas wells, in particular to a method for continuously mixing fracturing fluids using seawater. [0004] Background technique [0005] [0006] Fracturing fluid is an essential working fluid for fracturing stimulation in low-permeability oil and gas fields, and water-based fracturing fluid accounts for more than 90% of the current fracturing fluid due to its convenient preparation and low cost. [0007] In the prior art, water-based fracturing fluid mainly dissolves and swells thickeners (such as guar gum and its derivatives, modified polyacrylamide, viscoelastic surfactants, etc.) in clean water, and then adds necessary additives (such as demulsifiers, drainage aids, clay stabilizers, foaming agents, bactericides, etc.) to form thickened water with a certain viscosity. If nec...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 吴新荣
Owner 湖北菲特沃尔科技有限公司
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