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Steam anti-cone/ridge technology remedy

A technology of steam and steam slug, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., and can solve the problem of reduced efficiency of the method

Active Publication Date: 2017-08-04
CNOOC PETROLEUM NORTH AMERICA ULC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like Figure 10 As shown, for heavier oils, the efficiency of the method drops sharply

Method used

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  • Steam anti-cone/ridge technology remedy
  • Steam anti-cone/ridge technology remedy
  • Steam anti-cone/ridge technology remedy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0125] Nexen conducted a simulation study of SACT using the Exotherm model. Exotherm is a three-dimensional, three-phase, fully implicit, multi-component computer model designed to numerically simulate hydrocarbon recovery using thermal methods such as steam injection or combustion.

[0126] The model has been successfully applied to heavy hydrocarbon reservoirs for single well cycle thermal stimulation operations, hot water flooding, steam flooding, SAGD and combustion (T.B.Tan et al., Application of a thermal simulator with fully coupled discretized wellbore simulation to SAGD, JCPT , January 2002).

[0127] We modeled the following reservoirs:

[0128] Pressure – 6200kPa

[0129] Temperature – 28°C

[0130] Porosity – 33%

[0131] Initial Water Saturation – 30%

[0132] In situ viscosity – 2000cp

[0133] Reservoir – 16m

[0134] Bottom water – 10m

[0135] HZ well spacing – 75m

[0136] HZ Well Length – 1000m

[0137] We simulated SACT after coning / cresting prima...

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PUM

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Abstract

The present invention relates to a cyclical remedial method for recovering oil production from a primary oil recovery well that has been water blocked due to bottom water intrusion (cone or ridge), wherein: (a) the primary oil recovery well has greater than 95% (v / v) produced water cut; (b) the oil is heavy oil with an in situ viscosity >1000 cp; wherein the method comprises: (c) injecting a volume of 0.5 to 5.0 of the cumulative primary oil recovery times the steam slug, steam volume measured in water volume; (d) closing the well for a soak period after completion of the steam injection; and (e) producing the well until the water cut is greater than 95 %.

Description

Background technique [0001] figure 1 include figure 1 A and figure 1 b. Such as figure 1 As shown in A, many reservoirs have an active bottom water zone 20 below the oil-bearing net pay zone. If oil is pumped from a vertical well completed in an oil zone, especially highly viscous in-situ oil, water may cone into the production well and inhibit production. For production, coning will reduce the oil cut and increase the water cut until it is no longer economical to produce the well. In the industry, the well is said to have been "plugged." The mobility ratio of the oil determines the rate and extent of water coning. Generally, the problem of water coning is more serious when the oil is heavier. Such as figure 2 As shown, this problem can also be manifested in SAGD for bitumen recovery in bottom water reservoirs. [0002] Attempts have been made to prevent coning / cresting when the properties of the reservoir are known. However, these attempts have had limited success...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/32E21B43/24E21B43/30
CPCE21B43/24E21B43/30E21B43/32
Inventor R·K·克尔P·杨
Owner CNOOC PETROLEUM NORTH AMERICA ULC