Gas lift with nitrogen injection generated in situ

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Miguel A. Lozada Aguilar, M.del Remedios Arredondo Monarrez, SPE, Pemex, PEP.

Copyright 2000, Society of Petroleum Engineers Inc. This paper was prepared for presentation at the 2000 SPE International Petroleum Conference and Exhibition in Mexico held in Villahermosa, Mexico, 1–3 February 2000. This paper was selected forpresentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s). The material, as presented, does not necessarily reflect any position of the Society of Petroleum Engineers, its officers, or members.Papers presented at SPE meetings are subject to publication review by Editorial Committees of the Society of Petroleum Engineers. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of the Society of Petroleum Engineers is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words;illustrations may not be copied. The abstract must contain conspicuous acknowledgment of where and by whom the paper was presented. Write Librarian, SPE, P.O. Box 833836, Richardson, TX 75083-3836, U.S.A., fax 01-972-952-9435.

Nitrogen injection generated in situ with membrane technology can be a feasible and profitable alternate source of gas lift as shown in this study. INTRODUCTION Bellota –Chinchorro is one of the seven producing areas in the Southern Region of Mexico. The current production of this field is 105 000 STB/D of oil and 150

ABSTRACT Gas lift is a feasible option as an artificial lift system in a depleted field. In the Bellota field there is no substructure means to install any type of artificial lift system, therefore the use of nitrogen as a gas lift source isnecessary to keep the Bellota wells producing. After evaluating different options we implemented a nitrogen generated in situ project using the membrane technology. This paper analyzed the gas lift process design by using nodal analysis and optimum allocation of nitrogen in each well. Special emphasis and consideration was

MMSCF/D of gas produced from dolomite formations, belonging to Jurassic andCretaceous age. The objective of this study are the wells drilled in the Bellota field. Initial production of the bellota field started in 1982 reaching a peak production of 44 000 STB/D in 1995. Current production is at 20 000 STB/D, mainly attributed to natural depletion. Year- to- date production from this field is estimated at 140 MMSTB, and it is expected to produce another 50 MMSTB fromcalculated total reserves. This field is divided in two different sections. The wells that will be discussed in this gas lift application belong to the north section. These wells are currently depleted below saturation pressure. It is presumed that a gas cap has been already formed in the top of the reservoir, since GOR has been decreasing gradually. In addition, the reservoir pressure has declinedrastically making it necessary to provide some form of artificial lift assistance to keep the wells producing. Those wells that have been converted to gas lift, are deep wells, which have so many disadvantages for any

given to this project from an economical, operational, technical and environmental points of view. It is olso compares this option with differents alternatives including thetraditional gas lift method using natural gas as a source as well as the use of stored nitrogen from storage trucks (Tanks). Our evaluation of results

obtained from the different options investigated in this study clearly indicates that this method is a good option in this particular situation.



SPE 59028

artificial lift system....
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