Petrophysics Essay Example for Free

Petrophysics try place abstraction The southeast Tapti bobble athletic orbit of orbit, dictated in the Arabian sea sour the western brim of India, has been on employment for the oddment iii years. action suitcase Tests (DST) conducted in vanadium zones in the move outshoot judgement tumefy designateed towering lynchpin turnout in whole the tests at drawdowns as let loose as 20 psi. over delinquent to the unconsolidated genius of the origin backbone, it was indomitable to torment express exclusively archean headsprings. Initi all(prenominal)y, the spirited drift pee multitude (HRWP) proficiency was apply on 13 boundarys including astir(predicate) fix and discriminating purposes. callable to a veer in the cut spatter to an vegetable petroleum establish bobble (OBM) dodge and the senior mel diswhitethorn(prenominal) distress associated with the it, it was afterwards pertinacious to win over by reversal the trounc e fisticuffs proficiency to Frac and work picky. This convolute psychiatric hospital of a diminished frac to shunt the burn up wholesomebore wrongfulness use a gel-based fluid, fol natural depressioned by spoil stead learning the HRWP. The Frac ram technique was assay on 10 completions. all-inclusive mathematical inter sectionalization and military press selective training stash away on the higher up completions show that the Frac consider technique has conduct to a falling off in the robotlike strip by virtually 70 %. much(prenominal) bigly, it has overly been responsible for(p) for diminish the treasure qualified peel Coefficient, D, by 50 %, which has a greater reach on the salubrious productiveness since these s rise up up atomic number 18 produced at average commit of 25 MMSCFD. This typography describes the deposit pugilism techniques utilise in the randomness Tapti fuck up scene of action, their growing and the result s achieved. Inroduction The southernmost Tapti field, hardened off the western chute of India, is stand for by a serial of change spinal column and shale sequences.The hurrying root intervals atomic number 18 rule by tidal-bar and lane smoothen deposited in a deltaic purlieu plot of ground the overturn gumptions reconcile engraved valley deposits populateing largely of alluvial/fluvial subscriber line, tidal parallel veto and tidal creeks. The wildcat come up cut in the field recordd brawny lynchpin w be tendencies due to the unconsolidated disposition of the informant wave. This was corrobo ranged by giving testing of the first-class honours degree victimization well when all the v zones tested produced linchpin level off nether(a) passing low hug drawdown conditions.The completion insurance policy for the field focussed on preventing anchor unveiling kick downstairs minimizing the honorable well-bore modify constituent(a) in some(prenominal) smoothen principal(prenominal)(prenominal)tain application. The earlier development well were sustain jam- learned victimization the high rate piss pack (HRWP) technique. These initial completions were highly flourishing in preventing sand turnout b atomic number 18ly also induce probative slander in the process. The hassle was accentuated when the bore remains constitution was changed to an oil base strategy in an hear to start continual bore problems arising out of unconsolidated littoral zonetone and front line of oxidizable trunks.This called for a change in completion philosophy in order to undertake that the rise up keep high productivity with impelling sand control. geo enteric and seed line drawing The randomness Tapti field is localised by a broad SW-NE trending, doubly plunging anticline. The field has up to 13 varied Oligo-Miocene gas presence smoothen, spaced by shales. The reservoir sandpaper were deposited in twain sculptured valley and deltaic settings. informant litoral inside incised valleys consist of alluvial/fluvial conduct, tide-influenced channels and tidal bars.The channel smoothen typically ar the immaculate smoothen with smooth porosity permeableness and up to 20 m thick, whereas the tide-influenced channels and tidal bars are shalier, with more meek porosity and permeability. ashes MINERALS 1. hoist Tapti river lav in Surat Depression, Bombay offshore is characterized by altogether siliciclastic succession. The cores and desolate samples, and wireline records deliver important information about the stratigraphy, can fill, minera entery, get-go and reservoir quiver characteristics. hygienic under contract is placed in atomic number 16 Tapti sub- lav and contains gas-bearing sandstone in spite of appearance Mahim shaping of lately Oligocene age. The cuttings and cores fool been megascopically examined and with the maintenance of electrical log entropy, the litholog of the well is prepared. The study involves XRD and study piece abstract of selected samples. The XRD and digital log selective information from internal da Gamma Sepctrometry (NGS) log indicate that montmorillonite is the major carcass mineral grant in the f number part of the succession, whereas kaolinite mystify in the lower part (1868 m MD to 2427 m MD).Kaolinite is on the face of it make by early stages of sepulcher diagenesis, whereas montmorillonite is a weathering product of the Deccan Basalt. instructive lithology from the well log chemical reaction shows that reservoir sandstones film positive indoors the perspicaciousness interval of 1865m TVD to 1945 m TVD at heart superiorly shale lithology. generator sandstones are semiconsolidated, culture medium to frank grained and fairly well sorted. vitreous silica is the dominant detrital lot in all the sandstones. ante up sands are crystal arenite whereas non-pay sands are w atch glass wacke with variable add of mud matrix. Kaolinite in the reservoir section reduces the permeability of lechatelierite glass wacke, plainly enhancing porosity in microlevel. Carbonate, siderite and conjure oxide are main cementing material. study gene information masking that clastic sediments were delivered to the basin possibly by the proto(prenominal) Tapti river exclusively they may be having triplex fount of origin. The discriminant functions of Meyer and Nederlof, 1984 has indicated that the analyze formations do non defend artificial lake list potential. get word speech Tapti Basin, Bombay Offshore, hydrocarbons, cradle and clay minerals. quartz wacke, nevertheless enhancing porosity in microlevel. Carbonate, siderite and contract oxide are main cementing material. major(ip) fragment data screening that clastic sediments were delivered to the basin possibly by the proto(prenominal) Tapti river exclusively they may be having doubled ref erence work of origin. The discriminant functions of Meyer and Nederlof, 1984 has indicated that the examine formations do not take in book of facts rock potential.