TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn the moderate-permeability environment of the Hassi Messaoud field of central Algeria, proppant fracturing has significantly increased production, prolonging the economic life of many wells. Unfortunately, the logistics of mobilizing a workover rig to prepare the wellbore for stimulation has extended the stimulation cycle time. Additionally, many wells have tubular problems that require intervention such as squeeze cementing or tubular replacement before the stimulation process can begin. The availability of coiledtubing equipment in the field provides the means to stimulate the wells without a workover rig. Furthermore, when coupled with a mechanical isolation system, the coiled-tubing fracturing technique protects the production tubing from high treating pressure and abrasive proppants. In the past, the lack of a reliable isolation system has limited the success of these jobs.Reservoir conditions throughout the field allow low-rate stimulations but induce high bottomhole pressures, which make the use of conventional packers difficult. In many environments the bottomhole treating pressure creates differential pressures across the elements of a packer in excess of 9,000 psi. Several attempts to use existing packer technology yielded unsuccessful fracture treatments, and costly fishing operations were necessary to restore the wells to production. To provide an economical solution to the problems encountered by conventional mechanical packers, a new isolation system was designed. This paper provides case histories of several wells stimulated with coiled-tubing fracturing in the extreme environment of high-pressure, deep wells in the Hassi Messaoud field and examines the engineering challenges in developing a robust isolation system.
pW'ght 1~, Saci@ of Ptieum Engineem, IN, mm paper was prepard for pmentation at the 199.3 SPE International Symposium w Formation Damage~tiol held in Lafayette, Louisiana, 1S-19 Februa~1~, 7his pawr was s81ected for pr-ntafion by an WE Prcgram~miltw following rwiew d information mntained in an abstract submitted by the authcf(s), titents of the paWr, as pr-nted, h~not bwn raviti by the society M P~leum Enginw and am subject to correction by the author(s) h material, as pr~n~, dwa not nriiy rdiecf any Wtion of the *l@ of P-m Englne6~, b Mkem, or mmnkrs. PaPrs p~ntcd at SPE meetings are subject to publication w by Edtial~mh & the -d PtileumEngin-m, Electronic reduction, distribution, or stofage of any part af this pa~r for @mmerclal purpuam~ouf the written wn~nt of h~iety of P~leum Enginwm is prohibked, Perml=ion to reprcduu in print is~to an akfracf of @ mom thanM M illus*s may M M copied 7h0 abafract mu.9f -In conspicuous acknowladgmnt of Mere ad by whom the paper ws pm$6ntad Wfite Libmrian, AbstractThe Hassi-Messaoud Field is a thick sandstone reservoir covering an arm of 2000 km2. It is a flattened anticline located on the north of the El-Biod-Hassi-Messaoud elevation. This elevation is formed by a sequence of horsts and grabens contained by fatits in a sub-meridien direction. The faults are in general SSW to NNE oriented and cross all the producing reservoir (Cambro-Ordovician).The producing reservoir is located at 3300 m and consists of four distinct formations in addition to a "zone d'alteranm" (transition zone). These, are su~vided into drains (producing intervals) characterized by distinct properties. Overall, the field is divided into 25 separate zones that Mers in their geological and petrophysical properties and are under pressure maintenance by means of water an~or gas injection. Fig. 1 shows the field different zones and a cross section of the Cambro-Ordovician formatioh This paper presents the succesti application of a methodology to optimize production and r~ts of matrix acidizing treatments in the Hassi-Messaoud field. The corner stone of the methodology is damage characterization. The damage is analyzed and evaluated per zone. Categories according to damage severity and frequency are presented. Among others these categories include salt depsitioz scales deposition including barium date, clays types, fines migration, and asphaltenes. A thorough coverage of the geology, mineralogy, &trophysical pro~rties, formation fluids characteristics, reservoir pressure evolution and pressure maintenance, wells wmpletions and production schemes are presented for the 25 different zones that integrate the heterogeneous Hassi-Messaoud field Finally, 'production optimization as a retit of applying the methodology on matrix acidizing treatment is presented and quantified by : (1) treatments success ratiq (2) production gaiw (3) payout time; (4) decline rates of wells before and after treatment and (5) actual mst per_ ton of production gained
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