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Method for injecting low salinity water

A low-salinity injection well technology, applied in the field of low-salinity water injection system, can solve the problem of reducing the effect of incremental oil recovery

Active Publication Date: 2014-06-25
BP EXPLORATION OPERATING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It has been found that for reservoirs with interlayer sandstone and shale formations, the incremental oil recovery effect of using low-salinity waterflooding may be reduced

Method used

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  • Method for injecting low salinity water
  • Method for injecting low salinity water
  • Method for injecting low salinity water

Examples

Experimental program
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Embodiment Construction

[0029] figure 1is a schematic block diagram showing a simplified representation of the crude oil recovery system 100 . Within this system, there are multiple layers of reservoirs. In this example, the reservoir consists of a series of interlayers of permeable and impermeable layers. The permeable layers (sandstone in this example) contain oil in the pore spaces within the rock and are labeled 102 , 104 and 106 . The impermeable layers (shale in this example) are generally oil-free and are labeled 108 , 110 , 112 and 114 . A generalized surface layer 116 is shown above the top impermeable layer 108, which may include multiple oil-free layers, as well as a seawater layer if the reservoir is in the sea. The composition of these layers is irrelevant for this example.

[0030] Permeable and impermeable layers make up the reservoir. Penetrating the reservoir are: injection wells including control station 118 and wellbore 120 ; and production wells including control station 122 ...

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PUM

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Abstract

Methods, apparatuses and computer readable instructions for determining the effectiveness of, and for performing, a low salinity waterflood. An ion diffusion distance value is determined based on the rate of diffusion of ions within the rock of a reservoir and the residency time of floodwater within the reservoir. The thickness of the layers of the reservoir are compared to this ion diffusion value to determine the effectiveness of performing a low salinity waterflood and also to enable the effective control of a waterflood and to assist in the determination of locations of wells.

Description

technical field [0001] The present invention relates to systems and methods for determining the efficacy of low salinity waterflooding and for performing low salinity waterflooding in hydrocarbon containing reservoirs. In particular, the invention relates to when the reservoir comprises a relatively permeable layer sandwiched between relatively impermeable layers and when the relatively impermeable layer has an ion concentration compared to the relatively permeable layer when low salinity water is present therein. Systems and methods for use with relatively high ion concentrations. Background technique [0002] Hydrocarbon-bearing reservoirs typically take the form of multiple layers of sandstone sandwiched between layers of shale. Sandstone formations have sufficient porosity and permeability to store and transport fluids such as oil and water. Typically, the oil is held in the pores of the rock formation. Shale formations, by contrast, are relatively impermeable to thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
CPCE21B43/20E21B41/0092E21B49/00
Inventor J.A.布罗迪G.R.杰劳尔德
Owner BP EXPLORATION OPERATING CO LTD