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Enhanced oil recovery methods for producing oil from heavy oil fields

A technology for flowing oil and formation, which is applied in chemical instruments and methods, dehydration/demulsification by chemical methods, processing of hydrocarbon oil, etc., and can solve problems such as inability to effectively exploit oil reservoirs

Inactive Publication Date: 2014-09-24
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, these reservoirs cannot be efficiently exploited with thermal EOR because the thermal energy is almost completely absorbed by the flowing water
Therefore, thermal EOR is not an economically viable option

Method used

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  • Enhanced oil recovery methods for producing oil from heavy oil fields
  • Enhanced oil recovery methods for producing oil from heavy oil fields
  • Enhanced oil recovery methods for producing oil from heavy oil fields

Examples

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Embodiment Construction

[0029] To facilitate a better understanding of oil solubilization, the following examples are given. It will be appreciated that the following examples should in no way be construed as limiting or limiting the scope of the invention. Referring briefly to Figures 3a and 3b, shown are exemplary graphs showing, respectively, how the viscosity of an oil in general varies with 2 ) solvent interaction is reduced. The first graph shown in Figure 3a depicts testing of oil taken from the Camp Hill, Texas, USA reservoir. As shown, the approximate temperature of the oil in the reservoir is about 20°C, and when the volume fraction of carbon disulfide is 0, it shows a viscosity of about 1000cP. However, as the volume fraction of carbon disulfide increases, the viscosity of the oil gradually decreases. For example, at 0.2 (20%) carbon disulfide volume fraction, the oil exhibits a viscosity of about 30-40 cP at 20°C, which makes the oil quite flowable and easier to extract.

[0030] The ...

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Abstract

The present disclosure relates to enhanced oil recovery methods for highly viscous oil reservoirs containing large amounts of mobile water. One method includes injecting a carbon disulfide formulation or fluid into the formation via a first well and displacing the mobile water from the formation with the carbon disulfide fluid. The highly viscous oil is then solubilized using the carbon disulfide fluid, thereby generating a mixture of mobilized oil. The mixture of mobilized oil is then forced towards a second well and subsequently produced from the second well.

Description

field of invention [0001] The present invention relates to methods of enhanced oil recovery, particularly the recovery of highly viscous crude oil from reservoirs containing large amounts of flowing water. Background of the invention [0002] Enhanced oil recovery (EOR) is used to increase oil recovery from hydrocarbon-bearing rock formations around the world. There are basically three broad categories of EOR methods: thermal, chemical / polymeric, and gas injection, each of which can be used globally to enhance oil recovery from reservoirs beyond that possible with conventional hydrocarbon extraction methods. These methods can also extend reservoir life or increase the total oil recovery factor. [0003] Simply put, thermal EOR works by applying heat to hydrocarbon-bearing reservoirs. The most widespread practice of thermal EOR employs steam, which is used to reduce the viscosity of the oil so that it can flow freely to adjacent production wells. Chemical EOR, on the other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/035C10G1/00C10G33/04
CPCC09K8/035C10G1/00C10G2300/1033C10G1/04E21B43/16E21B43/164C09K8/58C10G33/04
Inventor P·M·波瑞格特R·瓦尔德斯
Owner SHELL INT RES MAATSCHAPPIJ BV
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