Simulation of Artificially Fractured Wells with Single-Well Models

Sonrexa, Kartikay

doi:10.2118/21338-ms

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…This is because physical limitations imposed by rock mechanics on the maximum "contained" acid fracture length that can be actually created. rw= ~f (4) Where Xf is the fracture half length.…”

Section: Case # 6: Horizontally Recompleted Well (H-2)mentioning

confidence: 99%

Horizontal Drilling vs. Acid Fracturing: A Review of Results in the Upper Zakum Field

Fada'Q¹,

Al-Tamimi²

1991

Proceedings of Middle East Oil Show

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Section: Case # 6: Horizontally Recompleted Well (H-2)mentioning

confidence: 99%

Horizontal Drilling vs. Acid Fracturing: A Review of Results in the Upper Zakum Field

Fada'Q¹,

Al-Tamimi²

1991

Proceedings of Middle East Oil Show

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Rigless Acid Fracturing Through Dual Completions: An Offshore Experience in the Upper Zakum Field

Tamimi¹

1991

All Days

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Well Stimulation by Fracturing (Acid and Hydraulic) was quickly accepted by the Oil Industry since its introduction in the late 40's (first ever hydraulic Fracturing job was conducted in Kansas, U.S.A. in July, 1947), still, its applicability to Abu Dhabi fields and reservoirs did not gain momentum until the 80's. This late arrival can be attributed to the fact that poor Permeability Reservoirs were not Permeability Reservoirs were not considered for development before then, or because, even when the development of these "tight" Reservoirs was undertaken (as is true for the Upper Zakum), too many constraints were imposed (Geological, Reservoir and type of Completion). Such constraints made fracturing difficult to carry out. Also, major advancement in Fracturing design and techniques took place in the 80's. Such techniques made it possible to reexamine the applicability of fracturing in the poor potential wells of the Upper Zakum. This paper presents a review of the steps taken to ensure the success of Acid Fracturing in poor Permeability wells, and how constraints /limitations imposed by well completion and reservoir conditions were accounted for. The exercise was successfully carried out in the multilayered heterogeneous reservoir of Thamama II in the Upper Zakum field, offshore Abu Dhabi. The uniqueness of the exercise is that in all cases presented, Acid Fracturing treatment was conducted through one tubing string in dually completed wells, yet on rigless basis. Good post treatment productivity was achieved at optimum cost and therefore minimum pay back time. Introduction The Zakum field is centred about 50 miles North West of the island of Abu Dhabi. The field covers an area of 470 sq. miles and lies under an average water depth of 60 ft. The Upper Zakum designates the three upper most culminations (Reservoir Units) of the lower Cretaceous Thamama group, the Reservoirs are called Thamama I, II and III. Thamama II is the biggest of these Reservoirs in terms of Oil in place and recovery, see Figure. 1a. Development of the field is based on a Pressure Maintenance Scheme using Pressure Maintenance Scheme using Power Water Injection. A 5-spot pattern is Power Water Injection. A 5-spot pattern is adopted for Thamama I and II, while a peripheral injection pattern is adopted for peripheral injection pattern is adopted for Thamama III. Some 283 wells have been drilled and completed in the field (producer and injector) to date. The field itself is divided into four geographical areas; North, South, Centre and West, each area is referred to as Satellite. RESERVOIR DESCRIPTION The three Upper Zakum Reservoirs are generally classified as low energy reservoirs. Thamama II (which is the main concern of this paper) is a thick 120 - 150 ft. multilayered limestone reservoir with variable amounts of dolomite in its lower third. Copyright 1991 Society of Petroleum Engineers

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Simulation of Artificially Fractured Wells with Single-Well Models

Cited by 2 publications

References 18 publications

Horizontal Drilling vs. Acid Fracturing: A Review of Results in the Upper Zakum Field

Horizontal Drilling vs. Acid Fracturing: A Review of Results in the Upper Zakum Field

Rigless Acid Fracturing Through Dual Completions: An Offshore Experience in the Upper Zakum Field

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