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Method of reducing the viscosity of hydrocarbon fluids

A hydrocarbon fluid, apparent viscosity technology, used in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in obtaining, pump equipment fatigue, low fluid flow production rate, etc., to improve oil-water separation, reduce equipment Loss, the effect of increasing production efficiency

Inactive Publication Date: 2014-03-19
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this requires large quantities of diluent, which are not readily available in the production field, and, in addition, in existing practice, the diluent needs to be recovered at the point of fluid delivery and pumped over long distances back to the field
[0005] Existing production of heavy oil (defined herein as API gravity less than or equal to 20) from the formation to the processing site results in significant pressure drop, pump equipment fatigue and low fluid flow production due to the high viscosity of the crude oil component in the produced fluid rate

Method used

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  • Method of reducing the viscosity of hydrocarbon fluids
  • Method of reducing the viscosity of hydrocarbon fluids
  • Method of reducing the viscosity of hydrocarbon fluids

Examples

Experimental program
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Embodiment 1

[0056] As an initial screen, two different polymer compositions were analyzed to determine their ability to reduce the apparent viscosity of crude oil at different concentrations. It was found that the use of acrylamide (Acam), N,N-dimethylaminoethylacrylate-benzyl chloride quat (DMAEA-BCQ) and N,N-dimethylaminoethylacrylate The cationic polymer material (composition 1) composed of ester-methyl chloride quaternary salt (DMAEA-MCQ) can significantly reduce the viscosity under a certain range of dosage and water content conditions. Data collected using Composition 1 (11:61:28 Acam:DMAEA-BCQ:DMAEA-MCQ) showed a viscosity reduction of over 80% and showed a dynamic range of water content for viscosity reduction (see Table 1).

[0057] Table 1

[0058]

Embodiment 2

[0060] This example demonstrates the effectiveness of the invention in reducing viscosity based on the amount of water added to the crude oil, which is limited to a minimum of 10% water in order to maintain a significantly lower viscosity emulsion that flows easily (see figure 1 ).

Embodiment 3

[0062] The high molecular weight cationic polymers of Composition 1 provide a unique class of W ) is 5,000,000-15,000,000kD - using type M W =∑(N i m i 2 ) / ∑(N i m i ) calculation, where N i = number of molecules of this molecular weight, M i = molecular weight of the molecule) high cationic charge density polymers of quaternary amines such as methyl chloride and benzyl chloride. Additional studies using similar lower molecular weight (less than 100,000 kD) charged polymers demonstrated that molecular weight has a significant effect on the performance of the charged material and its ability to emulsify (see Table 2). It should be noted that the viscosity increases with time and the amount of water decreases over time, making the emulsion unstable.

[0063]In Table 2, the chemical numbers are as follows: Composition 2 is 50 / 50 Acam / DMAEA-BCQ; Composition 3 is 50 / 50 Acam / DMAEA-BCQ; Composition 4 is 50 / 25 / 25 Acam / DMAEA- BCQ / DMAEA-MCQ; Composition 5 was 25 / 75 Acam DMAEA-B...

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Abstract

A method for reducing the viscosity of a hydrocarbon fluid encountered in petroleum operations is disclosed. The method includes contacting the hydrocarbon fluid with an effective amount of a composition comprising at least one polymer having at least 25 mole percent cationic monomers.

Description

technical field [0001] The present invention generally relates to a method of preparing low viscosity oil-in-water emulsions from viscous hydrocarbon fluids found in petroleum operations. More specifically, the present invention relates to methods of enhancing the recovery and transportation of heavy petroleum. In particular, the present invention relates to contacting hydrocarbon fluids occurring in petroleum operations with one or more polymers having at least 25 mole percent cationic monomers to produce simple or complex emulsions, thereby reducing the apparent viscosity of the hydrocarbons to improve transport efficiency. Background technique [0002] More than half of the world's proven oil reserves are heavy oils, many of which are new production areas, employing rapidly evolving technologies and having new demands. One of the most challenging aspects of this heavy oil production is the transportation of these highly viscous fluids. For crude oil production, the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/58C09K8/60C09K8/28
CPCC08F220/34C09K8/588C08F220/56
Inventor M·D·小福斯特A·K·弗拉特T·M·小韦瑟斯D·T·恩古延
Owner NALCO CO
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