Clean fracturing fluid and preparing method thereof

A technology for cleaning fracturing fluid and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost and high concentration, and achieve increased viscosity, high consistency and viscoelasticity, good compatibility

Active Publication Date: 2017-03-08
XIANYANG CHUANQING XINYUAN ENG TECHCO +1
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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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  • Clean fracturing fluid and preparing method thereof
  • Clean fracturing fluid and preparing method thereof
  • Clean fracturing fluid and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The present embodiment provides a kind of preparation method of cleaning fracturing fluid, and it comprises the following steps:

[0041] 1) Synthesis of Dipolyoctadecylamide

[0042] Take 100 g of high-purity dimer acid (dimer octadecanoic acid with a carbon number of C36>95%) and add it to N,N-dimethyl-1,3-propylenediamine (38.3 g, 0.38 mol), After mixing evenly, heat to 160-180°C, keep it 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 to remove excess N,N-dimethyl-1,3-propane Diamine, to obtain high-purity dimer octadecylamide.

[0043] 2) Synthesis of Dipolyamidopropylamine Oxide Surfactant

[0044] Add 10.3 g of 30% concentration of hydrogen peroxide into 27 mL of water and 12 g of dipropylene glycol, mix and heat to 70-80° C., then add 20 g of high-purity dioctadecylamide obtained in step 1), at 60-80 Reaction at ℃, when the reaction process reaches 98% of the theoretical va...

Embodiment 2

[0053] Present embodiment is on Haake 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 (concentration is the weight ratio of the active substance content).

[0054] Table 1 Viscosity test results

[0055]

[0056]

[0057] It can be seen from Table 1 that in different series of homogeneous liquids, the viscosity obtained after compounding the dipolyamide-containing amine oxide surfactant and the anionic polymer containing a hydrophobic group is higher than the viscosity when the two are used alone times, higher than single-chain amine oxide.

Embodiment 3

[0059] 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.

[0060] Table 2 Viscoelastic properties (60°C, 0.01rad / s)

[0061] Composition, by weight percent G' (storage modulus), Pa G” (loss modulus), Pa 0.25%HMPAM+0.2%DIAMO 0.52 0.21

[0062] It can be seen from Table 2 that when the frequency of the composite sample is very low (0.1rad / s), G' (storage modulus) is greater than G" (loss modulus), indicating that it has high viscoelastic properties. The sand-carrying performance is favorable.

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Abstract

The invention provides a clean fracturing fluid and a preparing method thereof. The fracturing fluid is prepared from, by weight, 0.1-5% of long chain dimer propionyl amine oxide, 0.1%-0.6% of anionic polyacrylamide polymer containing hydrophobic group, 0-4% of salt and the balance water. The clean fracturing fluid can be applied to oil and gas field fracturing, high consistence and viscoelasticity can be obtained at a low concentration, and a better rheological property and a better sand carrying effect can be obtained.

Description

technical field [0001] The invention belongs to the field of oil and gas development, and in particular relates to a clean fracturing fluid and a preparation method thereof. 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 su...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/30
Inventor 杨江吴磊秦文龙李冉
Owner XIANYANG CHUANQING XINYUAN ENG TECHCO
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