Petroleum Engineering 324 Well Performance Daily Summary Sheet Spring 2009 Blasingame/Ilk. Date: Materials Covered in Class Today: Comment(s):

Transcription

1 Petroleum Engineering 324 Well Performance Daily Summary Sheet Spring 2009 Blasingame/Ilk Date: Materials Covered in Class Today: Comment(s):

2 Petroleum Engineering 324 (2009) Reservoir Performance Analysis of Pressure Transient Tests Type Curve Analysis Objective: Apply dimensionless solutions ("type curves") and field variable solutions ("specialized plots") for unfractured and fractured wells in infinite and finite-acting, homogeneous and dual porosity reservoirs.

3 Notes:

4 Orientation: PTA Model-based Analysis Reservoir Models: Unfractured Well Fractured Well Naturally Fractured Reservoir Type Curve Library: Unfractured Well: WBS + IARF ("Bourdet-Gringarten") Pressure Buildup in a Rectangle (Unfractured Well) ("Ansah") Linear (Sealing) Reservoir Boundaries ("Stewart") Fractured Well: no WBS ("Cinco and Samaniego") Fractured Well: WBS ("Economides") Naturally Fractured Reservoir: Unfractured well ("Angel") Field Examples: (from SPE ) Unfractured oil wells. Hydraulically fractured gas wells. Hydraulically fractured water injection wells.

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6 Petroleum Engineering 324 (2009) Reservoir Performance Reservoir Models (for Type Curve Analysis)

7 Notes:

8 Unfractured Well: Flow Regimes From: Matthews, C. S. and Russell, D. G.: Pressure Buildup and Flow Tests in Wells. Monograph Series, Society of Petroleum Engineers of AIME, Dallas (1967) 1. Discussion: Flow Regimes (Unfractured Wells) INFINITE-ACTING RADIAL FLOW (IARF) is the most "popular" regime. PSEUDOSTEADY-STATE (PSS) flow CLOSED BOUNDARIES. STEADY-STATE (SS) flow CONSTANT PRESSURE (not realistic).

9 Unfractured Well: Orientation and Solutions From: Earlougher, R.C. Jr.: Advances in Well Test Analysis, Monograph Series, SPE, Dallas (1977) 5. Discussion: Orientation and Solutions (Unfractured Wells) Pressure profile propagates radially away from well (homogeneous). Cylindrical source solution finite wellbore. Line source solution infinitesimal wellbore (i.e., a line).

10 Unfractured Well: Skin Factor Concept From: Earlougher, R.C. Jr.: Advances in Well Test Analysis, Monograph Series, SPE, Dallas (1977) 5. Discussion: Skin Factor Concept (Unfractured Wells) Finite skin concept zone of "altered" permeability near the well. Infinitesimal skin concept mathematical convenience. Negative skin has mathematical (and physical) limitations.

11 Fractured Well: Flow Regimes From: Cinco-Ley, H., Samaniego-V., F.: "Transient Pressure Analysis for Fractured Wells," JPT (September 1981) Discussion: Flow Regimes FRACTURE LINEAR flow DOES NOT EXIST (a few seconds at most). FORMATION linear flow High fracture conductivity. BILINEAR flow Low fracture conductivity.

12 Person on my left is: Person on my right is: Name: Section: Petroleum Engineering 324 Well Performance Quiz 21 Log-Log Analysis/Interpretation for a Pressure Buildup Test (Data from SPE ) [03 April 2009] Given: These data were extracted from a pressure buildup test sequence run on a producing oil well. The Log-log data plot is attached. Reservoir properties: φ=0.27 r w =0.3 ft c t =1.1x10-5 psia -1 h=100 ft Oil properties: B=1.24 RB/STB μ =1.24 cp Production parameters: t p =158 hours q=9200 STB/D Governing Relations: (IARF = Infinite-Acting Radial Flow): qbμ 1 k = 70.6 h [ Δp' ] IARF qb Cs =... (Log-log plot) 24 mwbs Required: (YOU MUST SHOW ALL YOUR WORK AND LABEL ALL FLOW REGIMES) You are to estimate the following: Log-log Analysis: (Use the Δp' data on the log-log plot) Wellbore storage coefficient, C s = RB/psia Formation permeability, k = md Aggie Code of Honor: An Aggie does not lie, cheat, or steal or tolerate those who do. Required Academic Integrity Statement: (Texas A&M University Policy on Academic Integrity) "On my honor, as an Aggie, I have neither given nor received unauthorized aid on this academic work." (your signature)

13 Person on my left is: Person on my right is: Name: Section: Petroleum Engineering 324 Well Performance Quiz 21 Log-Log Analysis/Interpretation for a Pressure Buildup Test (Data from SPE ) [03 April 2009] Given: These data were extracted from a pressure buildup test sequence run on a producing oil well. The Log-log data plot is attached. Reservoir properties: φ=0.27 r w =0.3 ft c t =1.1x10-5 psia -1 h=100 ft Oil properties: B=1.24 RB/STB μ =1.24 cp Production parameters: t p =158 hours q=9200 STB/D Governing Relations: (IARF = Infinite-Acting Radial Flow): qbμ 1 k = 70.6 h [ Δp' ] IARF qb Cs =... (Log-log plot) 24 mwbs Required: (YOU MUST SHOW ALL YOUR WORK AND LABEL ALL FLOW REGIMES) You are to estimate the following: Log-log Analysis: (Use the Δp' data on the log-log plot) Wellbore storage coefficient, C s = RB/psia Formation permeability, k = md Aggie Code of Honor: An Aggie does not lie, cheat, or steal or tolerate those who do. Required Academic Integrity Statement: (Texas A&M University Policy on Academic Integrity) "On my honor, as an Aggie, I have neither given nor received unauthorized aid on this academic work." (your signature)