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New approach of pressure tests adapted to horizontal wells- Towards a best knowledge of petroleum deposits

Abstract

The main goal of this work is to define a new type of pressure tests better adapted to the specific features of horizontal wells. At the same time, our objective is to get a better knowledge of the well conditions and a more reliable characterization of the heterogeneities that can influence the oil production. The first part presents the state-of-the-art concerning the theoretical and practical aspects of horizontal well pressure tests. This review is done in order to answer the question: Why are conventional tests not suitable for horizontal wells. In the second part, we propose a new pressure test procedure - selective tests - that consists of testing limited sections of the horizontal well. The importance of production logs to choose the sections to be tested selectively is focused on. By numerical examples, we show that this kind of test is especially useful to identify properties`variation along the drainhole. We study two cases: a well with variable skin and a well in a sand-shale reservoir with a bottom aquifer. First, the problem is treated supposing that the well-reservoir system is known a priori. Secondly, the inverse problem is considered: we simulate a real situation where only some characteristics of  More>>
Authors:
Publication Date:
May 01, 1994
Product Type:
Thesis/Dissertation
Report Number:
IFP-41398
Reference Number:
SCA: 020200; PA: FRC-95:001536; EDB-95:019297; SN: 95001310269
Resource Relation:
Other Information: TH: These (D. es Sc.); PBD: May 1994
Subject:
02 PETROLEUM; PETROLEUM DEPOSITS; WELL LOGGING; PRESSURE CONTROL; RESERVOIR FLUIDS; OIL FIELDS; PRODUCTION; SAND; SHALE OIL; AQUIFERS; MATHEMATICAL MODELS; COMPUTERIZED SIMULATION; NUMERICAL ANALYSIS; 020200; RESERVES, GEOLOGY, AND EXPLORATION
OSTI ID:
10108043
Research Organizations:
Institut Francais du Petrole (IFP), 92 - Rueil-Malmaison (France); Paris-6 Univ., 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE95729625; TRN: FR9501536
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
FR
Size:
271 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Quintao Lara, A. New approach of pressure tests adapted to horizontal wells- Towards a best knowledge of petroleum deposits. France: N. p., 1994. Web.
Quintao Lara, A. New approach of pressure tests adapted to horizontal wells- Towards a best knowledge of petroleum deposits. France.
Quintao Lara, A. 1994. "New approach of pressure tests adapted to horizontal wells- Towards a best knowledge of petroleum deposits." France.
@misc{etde_10108043,
title = {New approach of pressure tests adapted to horizontal wells- Towards a best knowledge of petroleum deposits}
author = {Quintao Lara, A}
abstractNote = {The main goal of this work is to define a new type of pressure tests better adapted to the specific features of horizontal wells. At the same time, our objective is to get a better knowledge of the well conditions and a more reliable characterization of the heterogeneities that can influence the oil production. The first part presents the state-of-the-art concerning the theoretical and practical aspects of horizontal well pressure tests. This review is done in order to answer the question: Why are conventional tests not suitable for horizontal wells. In the second part, we propose a new pressure test procedure - selective tests - that consists of testing limited sections of the horizontal well. The importance of production logs to choose the sections to be tested selectively is focused on. By numerical examples, we show that this kind of test is especially useful to identify properties`variation along the drainhole. We study two cases: a well with variable skin and a well in a sand-shale reservoir with a bottom aquifer. First, the problem is treated supposing that the well-reservoir system is known a priori. Secondly, the inverse problem is considered: we simulate a real situation where only some characteristics of the system are known. For all the cases examined the results show clearly the superiority of the selective tests compared with the conventional ones. In the last part, we develop a new analytical solution to study the transient well pressure behaviour in a heterogeneous reservoir. The approach, based on the perturbation method, was applied to situations that are not well handled by standard finite difference numerical models, as the case of a shale lens inclined in relation to the well axis. (author).}
place = {France}
year = {1994}
month = {May}
}