[12] Patent
[11] Patent No.:GC0007505  
[45] Date of Publishing the Grant of the Patent: 30/Apr /2018                48/2018  
Number of the Decision to Grant the Patent:2018/125351
Date of the Decision to Grant the Patent:03/Apr/2018

[21] Application No.:GC 2013-23659

[22] Filing Date:25/2/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- Noor M. Anisur Rahman،2- Faisal M. Al-Thawad ،3- Saud A. BinAkresh

[73] Owner: SAUDI ARABIAN OIL COMPANY, 1 Eastern Avenue, 31311 , Dhahran , Saudi Arabia

[74] Agent: Suleiman I. Al-Ammar Law Office




Int. Cl.: E21B43/12; E21B43/14; E21B47/10 (2006.01)

[56] Cited Documents:

-C.W. Morris ET AL: Analysis of Geothermal Wells in Naturally Fractured Formations With Rate-Sensitive Flow, SPE Formation Evaluation, 01 December 1987, SPE-14169-PA.
-2 Inflow Performance:, Produced Water Reinjection Joint Industry Program, 01 January 2003.
- Ho-Jeen Su ET AL: Modeling of Equalizer Production System and Smart-Well Applications in Full-Field Studies, SPE Reservoir Evaluation & Engineering, 01 April 2009, SPE-111288-PA.
Examiner: Eng. Imad A. AlAhaidib

[57] Abstract: Disclosed is a method for transient testing of an oil well to determine the individual, distinct skin factor components of an apparent skin factor, which includes opening the well to a first predefined choke setting to allow the reservoir fluid to flow through the well for a first predefined period of time, and measuring a production rate of the reservoir fluid through the well, when the first predefined period of time expires. The method further includes performing a shut-in of the well for a first predefined build-up period, and repeating, when the first predefined build-up period expires, the steps of the flowing, the measuring, and the performing for at least two additional choke settings. Each of the additional choke settings is consecutively lower than a preceding choke setting. Further, the method includes determining an apparent skin factor for each measured production rate. The apparent skin factor is a function of the measured production rate. When each of the determined apparent skin factors is plotted against a respective squared-measured production rate value, the plotted values form a linear relationship. The method further includes determining a well skin factor and a completion skin factor based on the determined apparent skin factor. The well skin factor is defined by an intercept of the linear relationship when the squared-measured production rate is zero and the completion skin factor is defined by a product of the slope of the linear relationship and the squared-measured production rate.
No. of claims: 7     No. of figures: 4


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