Method for preparing fracturing fluid by utilizing seawater

A fracturing fluid and seawater technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems that restrict the development of fracturing

Inactive Publication Date: 2013-09-11
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, and the clean water needs to be transported from land to the offshore construction site, but due to the limitation of offshore construction conditions and resources, the cost and preparation methods of fracturing fluid severely restrict offshore fracturing. development of

Method used

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  • Method for preparing fracturing fluid by utilizing seawater

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment example 1

[0056] Preparation of base liquid: Add 99,470 kg of seawater into a container with a vacuum jet pump, start the jet pump, and evenly suck 400 kg of coriander film powder into the water. After adding the rubber powder, add 30 kg of crude oil demulsifier and 100 kg of drainage aid respectively. After the addition, continue to circulate evenly with the pump, and then put it aside for later use.

[0057] Preparation of cross-linking agent: Add 300 kg of clear water into a container with a stirrer, start the stirrer, then add 100 kg of mannitol and 100 kg of borax respectively, stir until the two are completely dissolved and set aside.

[0058] Preparation of fracturing fluid:

[0059] During fracturing construction, use the built-in pump of the sand mixer in the fracturing unit to pump 2.0m 3 The base liquid is pumped into the sand mixing tank at a flow rate of 10.0 liters per minute, and the crosslinking agent is pumped into the sand mixing tank at a flow rate of 10.0 liters per...

specific Embodiment example 2

[0062] Preparation of base liquid: add 98,970 kilograms of seawater into a container with a vacuum jet pump, start the jet pump, and evenly suck 400 kilograms of hydroxypropyl guar gum powder into the water. After adding the rubber powder, add 30 kg of crude oil demulsifier, 100 kg of drainage aid, and 500 kg of foaming agent. After the addition, continue to circulate evenly with the pump, and then put it aside for use.

[0063] Preparation of cross-linking agent: Add 400 kg of clear water into a container with a stirrer, start the stirrer, then add 160 kg of mannitol, 160 kg of borax, and 80 g of caustic soda, stir until the three are completely dissolved and set aside.

[0064] Preparation of fracturing fluid:

[0065] During fracturing construction, use the built-in pump of the sand mixer in the fracturing unit to pump 2.5m 3 The base liquid is pumped into the sand mixing tank at a flow rate of 20.0 liters per minute, and the crosslinking agent is pumped into the sand mixi...

specific Embodiment example 3

[0068] Preparation of base liquid: add 98,800 kilograms of seawater into a container with a vacuum jet pump, start the jet pump, and evenly suck 550 kilograms of hydroxypropyl guar gum powder into the water. After adding the rubber powder, add 50 kg of crude oil demulsifier, 100 kg of drainage aid, and 500 kg of foaming agent respectively. After the addition, continue to circulate evenly with the pump, and then store it for later use.

[0069] Preparation of cross-linking agent: Add 500 kg of water into a container with a stirrer, start the stirrer, then add 100 kg of mannitol, 200 kg of borax, and 200 g of caustic soda, stir until the three are completely dissolved and set aside.

[0070] Preparation of fracturing fluid:

[0071] During fracturing construction, use the built-in pump of the sand mixer in the fracturing unit to pump 2.8m 3 The base liquid is pumped into the sand mixing tank at a flow rate of 28.0 liters per minute, and the crosslinking agent is pumped into the...

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Abstract

The invention discloses a method for preparing a fracturing fluid by utilizing seawater. The method comprises the following steps of: preparing a base fluid by 0.25-2.0 b (b represents unit part by weight) of antisludging agent, 0.25-1.0 b of plant gelatine powder, 0.01-1.0 b of crude oil emulsion breaker, 0.01-1.0 b of clean up additive, 0.00-1.0 b of foaming agent and 94.0-99.48 b of seawater; and preparing a cross-linking agent by 5-30 b of borax, 5-40 b of mannitol, 1-20 b of caustic soda and 10-89 b of fresh water. 100 c (c represents unit part in volume) of base fluid, cross-linking agent of which the volume is 0.1%-2.0% of the volume of the base fluid in part by volume, and gel breaker of which the volume is 0.001%-0.1% of the volume of the base fluid in part by weight are together added and mixed to prepare the fracturing fluid. According to the invention, 94.0-99.48 parts of seawater is used for preparing the base fluid, except the necessary chemical agents, all the base fluid part is prepared from seawater, so the site operation is simple and convenient, and the cost is lower; and the fracturing fluid thickener adopts natural plant gelatine powder.

Description

[0001] technical field [0002] [0003] The invention relates to a method for preparing a water-based fracturing fluid used in the fracturing and stimulation process of an oil well or a natural gas well, in particular to a method for preparing a fracturing fluid by 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 necessary,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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