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Viscoelastic surfactants and methods of making and using same

一种表面活性剂、降粘剂的技术，应用在粘弹性表面活性剂及其制作方法和应用领域，能够解决大量的物料、移除困难等问题

Inactive Publication Date: 2015-11-25
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional lost circulation agents may have many disadvantages, such as the large amount of material required to obtain desired properties (such as viscosity, etc.), and the difficulties involved in removing the constituent materials of the lost circulation agent after processing

Method used

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  • Viscoelastic surfactants and methods of making and using same
  • Viscoelastic surfactants and methods of making and using same
  • Viscoelastic surfactants and methods of making and using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The rheological properties of CASP-VC of the type described herein were investigated. Eight samples were prepared, designated Samples 1-8. Sodium oleate (NaOle), commercially available from TCI, USA, was used as the anionic surfactant and octyltrimethylammonium chloride (C 8 TAC) was used as the cationic surfactant to prepare samples 1-4. use C 8 Samples 1-4 were prepared at TAC:NaO ratios of 3:7, 4:6, 2:8, and 1:9, respectively. A sufficient amount of the sample was then dissolved in deionized water (DIH 2 O) to form a 3wt.% solution. The resulting CASP-VC was anion-rich due to the larger anion-to-cation ratios of samples 1-4.

[0051] Sodium caprylate (NaCap) commercially available from TCI USA was used as anionic surfactant and octadecyltrimethylammonium chloride (C 18 TAC) was used as the cationic surfactant to prepare samples 5-8. Samples 5-8 were prepared using C18TAC:NaCap ratios of 7:3, 6:4, 8:2, and 9:1, respectively. A sufficient amount of these sample...

Embodiment 2

[0057] The zero-shear viscosity of anion-rich and cation-rich CASP-VC was studied. Samples 1-8 described in Example 1 were used again in this example. In addition, five more samples were prepared according to the description in Example 1, named samples 9-13. Table 2 shows the cationic and anionic surfactants and CAR for samples 9-13.

[0058] Table 2

[0059] sample

[0060] image 3 is a graph of the viscosity of samples 1-13 as a function of the weight fraction of the minor component. For samples 1-4 and 9-11, the subcomponent was cationic surfactant. For samples 5-8 and 12-13, the subcomponent was anionic surfactant. The results showed that the CARs that produced the greatest viscosity were about 70:30 and 30:70, as image 3 The peaks on the anion-rich and cation-rich CASP-VC are shown. Additionally, the viscoelasticity of both cation-rich and anion-rich CASP-VC exhibited up to a 300,000-fold increase compared to the surfactant component alone. This increa...

Embodiment 3

[0062] The kinetic properties of CASP-VC of the type described herein were investigated. Specifically, samples 1-3 and 5-7 in Example 1 were measured for complex viscosity, storage modulus, and loss modulus as a function of frequency. Figure 4 and 5 Graphs of complex viscosity, storage modulus, and loss modulus as a function of frequency for samples 1-3 and samples 5-7, respectively. It was shown that these fluids exhibited significant loss and storage moduli, demonstrating their viscoelastic properties.

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Abstract

A method of servicing a wellbore comprising placing downhole a composition comprising a surfactant package comprising a cationic surfactant and anionic surfactant, wherein the surfactant package when contacted with an aqueous solution forms a viscosified composition in the presence of less than about 30 wt. % of a hydrotrope.

Description

technical field [0001] This application is a divisional application of Chinese Patent Application No. 201080025087.8 entitled "Viscoelastic Surfactant and Its Preparation Method and Application" with the filing date of March 17, 2010. The present disclosure generally relates to wellbore servicing fluids. More specifically, the present invention relates to viscoelastic surfactants and methods of making and applications thereof. Background technique [0002] Natural resources, such as natural gas, oil, and water present in a subterranean formation or subterranean zone, are often obtained by drilling a wellbore down the subterranean formation while circulating a drilling fluid through the well. During drilling of a wellbore, drilling fluid is circulated down the drill string, through the drill bit, and onto the surface of the annulus between the wellbore wall and the drill string. The drill string may be drill pipe, casing string or any other suitable conduit. In particular,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/40C09K8/42C09K8/60C09K8/68E21B43/04
CPCC09K8/035C04B28/02C04B40/0039C09K8/40C09K8/42C09K8/602C09K8/68C09K2208/30E21B43/04C04B22/0026C04B22/124C04B22/128C04B24/04C04B2103/402C04B2103/404
Inventor 瑞安·范桑特恩道格拉斯·J·哈里森
Owner HALLIBURTON ENERGY SERVICES INC
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