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Methods for SAGD Optimization

IP.com Disclosure Number: IPCOM000213572D
Publication Date: 2011-Dec-21
Document File: 9 page(s) / 3M

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 44% of the total text.

Page 01 of 9

Summary of the Invention:
This disclosure outlines several novelties associated with steam-assisted gravity drainage (SAGD) oplimization and include:


• Use of 2-D proxies for parameter identification and 3-D model optimization speed-up


• Utility of preheating in extra heavy SAGD optimization


• Novel operationaI staging


• Alternative well configurations, spacing, separation & configuration


• Decoupling of injector-producer


• IVlethods for delaying or preventing steam breakthrough

Representative Figure:

Baseline
Optimized


Page 02 of 9

Field of Invention

Exploitation of extra heavy oil assets involves complex and costly production processes, one of which is steam-assisted gravity drainage (SAGD). This method requires the generation of substantial quantities of steam, which is injected into a horizontal injection well parallel to and above a paired horizontal producer. To this end, simulation tools with proper treatment of thermodynamics are often used to provide forecasts for production, to provide stearn requirements, and to determine probable economic viability.

  Tangible benefits forthcoming from this investigation are new operational strategies for maximizing NPV, recognition of the impact and optimal duration of preheating, reduced steam fingering and breakthrough, and efficient comparisons of different well patterns, which could save field development capital expenditure.

Both solid and dashed blocks form 1 complete SAGO reservoir unit (i.e., 1t1)

The SAGD well pair is located in the exact center {in )'-direction)

-----:I"(r'2]-.~-­

/

,,'

,

---­

-------------------­

                       Steam In ector Vertical Separation between

wells ('Close', 'Mid' 'Far')

---------­ ~,I

"

,

I I

C

o

0';:;

U

~

, II

I

I I I

011 roducer : ~

......_ -..W-.~IIL-e-ngt"h-:"'50"om-,"8"'oo~m-,-12-00""m;,;";,,l;---: ~~ )

. ,~~V/

:


*----'.;;;-;;;;--;;.;-.-.. _._--_.. _-_. J Re~e~o!r Len~h l--- ..__ J,<e,~~:/

"'0

,

o~/

1'1

:

x-direction

Rese~oi .. Unit Itt

:<

  Oueto assum.d symmetry of the model l-­ the30 simulated just the Salmon·shod.d BClh .haded region

region: SAGO well pa"(a I

repre5ents. the full area

coveted by SAGO well ~ajr (a )

-a""" i'

Reservoir Unit "2

bO

Well poir Spocin8: distance ('n r'

dlreetion}betw••n well pairs a and b Normal: 75m
Extend.d: 225m

Plan (.t-y) view of 2 SAGD well pairs (a & b)

Figure 1: Schematic of a generalized geometry of the SAGO problem.


Page 03 of 9

  This invention disclosure was conceived foHowing a detailed investigation into SACD optimization methods and processes. The work is based upon modelling using the E300 Thermal simulator which was used to model a variety of fluids; \vellbore configurations and reservoir types. These models were then studied using the PCAuTum and AUTum optimiza­ tion prototypes to establish the findings and novelties described herein. It should be stressed that these findings are not based on ad hoc field observations but rather they derive from a systematic and rigorous analysis of...