Supramolecular clean fracturing fluid, and preparation method and application thereof

A technology for cleaning fracturing fluids and supramolecules, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of high concentration and high cost, and achieve high consistency and viscoelasticity, good rheology and portability sand effect effect

Active Publication Date: 2015-06-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the viscoelastic surfactant fracturing fluid has many advantages such as no residue and less damage to the formation, its high concentration and corresponding high cost require further improvement.

Method used

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  • Supramolecular clean fracturing fluid, and preparation method and application thereof
  • Supramolecular clean fracturing fluid, and preparation method and application thereof
  • Supramolecular clean fracturing fluid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a preparation method of supramolecular cleaning fracturing fluid, which comprises the following steps:

[0038] 1) Synthesis of dimer octadecylamide or dimerization and trimerization of mixed octadecylamide

[0039] Take high-purity dimer acid (the content of dimerized octadecanoic acid with C36>95%), or dimerization and trimerization mixed acid (the content of dimerized octadecanoic acid with C36 is 80%, and the carbon number is 80%). Trimeric octadecanoic acid whose number is C54 accounts for 20%) 100g was added to N,N-dimethyl-1,3-propanediamine (38.3g, 0.38mol), mixed evenly and heated to 160-180 ℃, keep warm for 3-8 hours, distill off the water generated by the reaction, and the reaction ends when the acid value is less than 6; distill off excess N,N-dimethyl-1,3-propylenediamine to obtain high-purity dimer Octadecylamide or dimeric, trimerized mixed octadecylamide.

[0040] 2) Synthesis of Betaine Type Amphoteric Surfactant

[0041] Sod...

Embodiment 2

[0053] Present embodiment is on Harke RS6000 rheometer, in 100s -1 Under the shear rate, the viscosities of the liquids with different compositions were tested for viscosity at 70° C., and the results are shown in Table 1 (the concentration is the content of effective substances).

[0054] Table 1 Viscosity test results

[0055] serial number

[0056] It can be seen from Table 1 that in different series of homogeneous liquids, the viscosity obtained after compounding the amphoteric surfactant containing two or three hydrophilic groups and the anionic polymer containing hydrophobic groups is higher than that obtained when the two are used alone. The sum of the viscosities is higher, and compounding with anionic surfactants can further increase the viscosity.

Embodiment 3

[0058] In this embodiment, the dynamic viscoelasticity of the composite sample containing HMPAM and surfactant in Example 2 was tested on a Haake Mars rheometer, and the results are shown in Table 2.

[0059] Table 2 Viscoelastic properties (40°C, 0.01rad / s)

[0060] serial number

[0061] It can be seen from Table 2 that when the frequency is very low (0.1rad / s), the G' (storage modulus) of the composite sample (No. 1-3) is greater than G" (loss modulus), showing that it has a relatively high High viscoelastic properties are beneficial to sand-carrying performance.

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PUM

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Abstract

The invention provides a supramolecular clean fracturing fluid, and a preparation method and application thereof. The fracturing fluid comprises the following components in percentage by weight: 0.1-5% of amphoteric surfactant, 0.1-0.8% of anionic polymer containing hydrophobic group, 0-2% of anionic surfactant, 0-4% of salt and the balance of water. The amphoteric surfactant is one or combination of an amide amphoteric surfactant with two hydrophilic groups and one hydrophobic group and an amide amphoteric surfactant with three hydrophilic groups and one hydrophobic group. The supramolecular clean fracturing fluid is applicable to oil-gas field fracturing, and can obtain higher consistency and viscoelasticity under the condition of lower concentration, thereby obtaining better rheological property and sand carrying effect.

Description

technical field [0001] The invention relates to a supramolecular cleaning fracturing fluid and its preparation method and application, belonging to the field of petroleum. Background technique [0002] my country's oil and gas fields are rich in reserves in low-permeability layers, but their natural productivity is low or has no natural productivity at all. It is difficult to obtain economic development value without fracturing and stimulation to improve single well production. The application of fracturing fluid technology to develop such reservoirs is of great significance. The main function of fracturing fluid is to bring viscoelastic fluid and proppant into the fractured formation to increase permeability to increase oil and gas production. [0003] The amount of residue after hydration of the fracturing fluid directly affects the fracturing effect. Commonly used fracturing fluids are high-molecular-weight guaran or its modified products, and the residue content of such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/602C09K8/68C09K8/882C09K2208/30
Inventor 杨江崔伟香管保山邱晓惠卢拥军
Owner PETROCHINA CO LTD
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