A method for preparing fracturing fluid by using fracturing flowback fluid

A fracturing flowback fluid and fracturing fluid technology, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problems of complex process and difficult operation, large amount of fracturing flowback fluid, and large dosage of chemicals, etc. Achieve the effect of solving technical problems, solving re-dosing, and adding small doses

Active Publication Date: 2018-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The amount of fracturing flowback fluid is large, and the discharge and reinjection treatment cause waste of water resources. At the same time, the discharge and reinjection treatment has problems such as large amount of chemicals, complicated process and difficult operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In the fracturing construction of Anping*3 Well in Changqing Oilfield, the method provided by the embodiment of the present invention is used to prepare the fracturing fluid with the fracturing flowback fluid, including: after the fracturing flowback fluid is subjected to demulsification, flocculation and precipitation treatment Obtain treated water; sequentially add bactericide, ion stabilizer, clay stabilizer, demulsification aid and drainage agent and thickener to the treated water to prepare fracturing fluid base fluid; add crosslinking agent to the fracturing fluid base fluid to adjust agent, adjust the pH of the fracturing fluid base fluid to 9-10, and form a fracturing fluid gel. Specifically follow the steps below:

[0044] Step 1: Collect the fracturing flowback fluid of Well Anping*3 into the waste liquid pool, introduce it into the coagulation tank after simple pre-oxidation treatment, add demulsifier and flocculant into the coagulation tank, and pass through...

Embodiment 2

[0049] In the fracturing operation of Well Anping*7 in Changqing Oilfield, the embodiment of the present invention provides a method for preparing fracturing fluid with fracturing flowback fluid, and the operation steps of the method are the same as those in Example 1. Among them, the mass ratio of fracturing flowback fluid, demulsifier and flocculant is: 100:0.2:0.4; the treated water of fracturing flowback fluid is mixed with bactericide, ion stabilizer, clay stabilizer, demulsification aid and drainage agent and The mass ratio of the thickener is: 100:0.4:0.4:0.6:0.4:0.4, and the pH of the fracturing fluid base fluid is adjusted to 10 with 5% NaOH solution to form a fracturing fluid gel.

[0050] Under the same test conditions as in Example 1, it is measured that the apparent viscosity of the fracturing fluid base fluid provided by this embodiment is 24mpa·s, and the apparent viscosity of the fracturing fluid gel is 120mpa·s. The fluid can evenly carry the fracturing proppa...

Embodiment 3

[0052] In the fracturing operation of West *-48 Well in Changqing Oilfield, the embodiment of the present invention provides a method for preparing fracturing fluid with fracturing flowback fluid, and the operation steps of the method are the same as those in Example 1. Among them, the mass ratio of fracturing flowback fluid, demulsifier and flocculant is: 100:0.5:0.6; the treated water of fracturing flowback fluid is mixed with bactericide, ion stabilizer, clay stabilizer, demulsification aid and drainage agent and The mass ratio of the thickener is: 100:0.3:0.4:0.4:0.2:0.25, and the pH of the fracturing fluid base fluid is adjusted to 9.6 with 5% NaOH solution to form a fracturing fluid gel.

[0053] Under the same test conditions as in Example 1, it is measured that the apparent viscosity of the fracturing fluid base fluid provided in this example is 20mpa·s, and the apparent viscosity of the fracturing fluid gel is 118mpa·s. The fluid can evenly carry the fracturing proppa...

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Abstract

The invention discloses a method for preparing a fracturing fluid by using a fracturing flow-back fluid, and belongs to the fracturing field. The method comprises the following steps: demulsifying the fracturing flow-back fluid, carrying out flocculation pretreatment, and filtering to obtain treatment water, adding a proper amount of a glutaraldehyde bactericide into the treatment water in order to remove bacteria, adding an organic phosphate ion stabilizer, a fluorocarbon cleanup additive and guar gum, and adjusting the pH value of the above obtained system by using a pH adjusting agent in order to prepare the guar gum fracturing fluid, wherein addition of a cross-linking agent is not needed. The method for preparing the fracturing fluid by using the fracturing flow-back fluid fully utilizes the water resource in the fracturing flow-back fluid, avoids the defect of water resource waste caused by discharge and re-injection treatment in the prior art, also has the advantages of small dosage of added medicines, low cost and simple treatment operation, effectively solves the technical problem of fluid re-preparation of the fracturing flow-back fluid, and is of great significance to energy saving, water saving and environmental protection.

Description

technical field [0001] The invention relates to a method for preparing fracturing fluid used in the process of oil recovery or gas recovery, in particular to a method for preparing fracturing fluid using fracturing flowback fluid. Background technique [0002] Fracturing refers to a method of using a certain force to form cracks in oil and gas layers during the process of oil or gas production. The oil layer fracturing process is to use a fracturing vehicle to squeeze a high-pressure, large-displacement liquid with a certain viscosity into the oil layer. After pressing out many cracks in the oil layer, use proppant to fill the cracks, improve the permeability of the oil and gas layers, and increase the permeability of the oil layer. Oil production. The high-pressure, large-displacement liquid with a certain viscosity used in fracturing operations is called fracturing fluid. Fracturing fluid is an aqueous solution mainly composed of thickeners, demulsification aids and drai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/12
Inventor 何治武周佩董俊王小勇刘宁李宁军
Owner PETROCHINA CO LTD
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