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Process for recovery of oil from an oil-bearing formation

A technology for oil-carrying formations and formations, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve problems such as reducing formation permeability

Inactive Publication Date: 2016-09-28
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, formation water with a higher content of divalent cations relative to the aqueous polymer mixture can precipitate polymers of the mixture due to the polymer's affinity for divalent cations, possibly reducing the permeability of the formation

Method used

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  • Process for recovery of oil from an oil-bearing formation
  • Process for recovery of oil from an oil-bearing formation
  • Process for recovery of oil from an oil-bearing formation

Examples

Experimental program
Comparison scheme
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Embodiment

[0099] Experiments were conducted to determine the effect of using a low-salinity aqueous displacement fluid on viscosity and divalent cation exchange in an oil-bearing formation relative to an aqueous displacement fluid formed by combining a polymer with formation water. The displacement fluid contains polymer and has a TDS content of less than 5,000 ppm and less than half that of the formation water, and its MAR is 70-130% of that of the formation water. For low salinity aqueous displacement fluids and aqueous displacement fluids formed by combining polymers with formation water, the amount of polymer required to provide the same viscosity was measured.

[0100] Sandstone cores were aged with crude oil for 4 weeks at a temperature of 50°C (corresponding to the formation temperature of the formation from which the crude oil was obtained). Diffraction analysis indicated that the core material was 95% quartz, and the remaining 5% consisted of illite-smectite, kaolin and illite-...

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Abstract

The invention discloses a process for recovery of oil from an oil-bearing formation. The present invention is directed to a process for producing oil. The mass action ratio (MAR) of divalent cations to monovalent cations of water from an oil-bearing formation is determined, and an aqueous displacement fluid having a total dissolved solids content of from 200 ppm to 5,000 ppm and a MAR of divalent cations to monovalent cations of from 70% to 130% of the MAR of divalent cations to monovalent cations of the formation water is introduced into the formation. Oil is produced from the formation after introducing the aqueous displacement fluid into the formation.

Description

technical field [0001] The invention relates to a method for recovering oil from an oil-carrying formation. In particular, the invention relates to a method of recovering oil from an oil-bearing formation using a fluid comprising a polymer. Background technique [0002] Due to the natural pressure of the oil-carrying formation, only a portion of the oil present in the oil-carrying formation can be recovered. The oil recovered by this "prime" recovery is typically 5-35% of the oil in the formation. Enhanced oil recovery methods have been developed to increase the amount of oil that can be recovered from oil-laden formations above or beyond that recovered in primary recovery. [0003] Waterflooding (in which water is injected into an oil-carrying formation through an injection well to mobilize oil and drive oil through the formation to be produced from a producing well) is widely used to increase the amount of oil recovered from a formation beyond the initial recovery Secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
CPCC09K8/588E21B43/162
Inventor D·J·利塞姆M·M·品格-阿尔马达E·C·M·福尔摩轮J·F·范文登L·B·M·沃星
Owner SHELL INT RES MAATSCHAPPIJ BV