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Nano-composite fracturing fluid as well as preparation method and application thereof

A nano-composite and fracturing fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to achieve oil and gas increase or continuous increase, difficulty in driving residual oil in micro-throat throats, etc., and achieve excellent carrying capacity sand performance, increase oil and gas production, and excellent high temperature resistance

Active Publication Date: 2017-11-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the existing nanomaterials cannot be well dispersed in the fracturing fluid, if the nanocomposite fracturing fluid is still a micron-scale system after the gel is broken, it is still difficult to drive the residual oil in the micro-throat pores. , and cannot achieve oil and gas production increase or continuous increase

Method used

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  • Nano-composite fracturing fluid as well as preparation method and application thereof
  • Nano-composite fracturing fluid as well as preparation method and application thereof
  • Nano-composite fracturing fluid as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1～3

[0052] The present embodiments 1-3 provide a nanocomposite fracturing fluid, the preparation method of which comprises the following steps:

[0053] 1. Preparation of nano-inorganic phase

[0054] Using the co-precipitation method, at room temperature (about 25°C), add aluminum nitrate and magnesium nitrate to deionized water, after the dissolution is complete, continue to add sodium hydroxide and 2-acrylamido-2-methylpropanesulfonic acid ( AMPS), and control the molar ratio between aluminum nitrate, magnesium nitrate, sodium hydroxide and AMPS to be about 1:2:1:1. During the continuous stirring process, continuously add 30% mass concentration of sodium hydroxide aqueous solution to adjust the pH value to about 10 to obtain a hydrotalcite slurry;

[0055] Put the industrial layered silicate powder and deionized water into the three-necked flask according to the mass ratio of 1:15, and after natural swelling at a temperature of about 25°C for half an hour, the temperature of t...

Embodiment 1

[0082]The particle size distribution curve of embodiment 1 and embodiment 3 and figure 1 Almost consistent, the gel breaking solution contains more than 85% of nanomicelles with a particle size of less than 100nm, and less than 15% of nanomicelles with a particle size ranging from 100nm to 500nm.

[0083] Therefore, the nano-composite fracturing fluids in Examples 1-3 break gel under formation conditions and form multi-scale nano-composite micelles with nucleation and phase separation, so that they can smoothly enter low-permeability, ultra-low-permeability and tight oil and gas and very The micro-channels of regular oil and gas layers are conducive to driving the flow of oil and gas in the "nano-micron pore-throat channels" and the surrounding channels, and form an efficient injection-production system.

experiment example 1

[0089] Firstly, the nano-composite thickener is prepared by the same method as in Examples 1-3, and then the base fluid of the nano-composite fracturing fluid is prepared. The specific steps are:

[0090] Add 350mL of tap water to three beakers respectively, under high-speed stirring, add 0.35g, 0.70g, 1.05g of carboxymethyl cellulose as structure regulator, after the dissolution is complete, then add 2.45g of nanocomposite thickener, dissolve After completion, three groups of nanocomposite fracturing fluid base fluid samples were obtained, which were respectively recorded as samples A1, A2 and A3. The viscosity of samples A1-A3 was measured with a six-speed viscometer, and the results are shown in Table 4.

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Abstract

The invention provides a nano-composite fracturing fluid as well as a preparation method and an application thereof. The nano-composite fracturing fluid is prepared from components in parts by weight as follows: 0.1-3.0 parts of a nano-composite thickening agent, 0.1-0.5 parts of a structure regulator, 0.1-1.0 part of a clay stabilizer, 0.1-1.0 part of a cleanup additive, 0.1-1.0 part of a foaming agent, 0.1-2.0 parts of an organic crosslinking agent, 0.01-0.5 parts of a gel breaker and 90.0-99.39 parts of water. Due to interaction between the structure regulator and the nano-composite thickening agent, the nano-composite fracturing fluid has extremely excellent sand carrying performance, good high-temperature resistance and anti-shearing performance, can effectively break gel in situ under a formation condition, can form multiscale nano-composite micelle through separate nano-dispersion and nucleation processes, is applicable to oil and gas exploitation in various stratum environments and improves the oil and gas injection and exploitation efficiency.

Description

technical field [0001] The invention relates to a nanocomposite fracturing fluid and its preparation method and application, and belongs to the technical field of reservoir reconstruction and fracturing engineering in oil field exploitation. Background technique [0002] Fracturing engineering is an engineering operation process of oil and gas exploitation. It is an important technological measure and effective technology for increasing production of oil and gas wells and increasing injection of water injection wells. Especially in the exploitation of low permeability oil and gas fields, fracturing engineering plays a very important role. In fracturing engineering, a liquid with certain viscoelasticity is pressed into the formation through high pressure, and this viscoelastic liquid is called fracturing fluid. The fracturing fluid is pressed into the ground under high pressure, and the gel breaker in the fracturing fluid will break the fracturing fluid to form a fluid with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/685C09K8/882C09K8/887C09K8/90C09K2208/12C09K2208/26
Inventor 柯扬船胡旭
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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