l-M DOpwwspoprad rOrp+owMOn at (ha 1SSS SPE Annual Tachmal Cc+!fwwa qnd ExittbMonh.ld in Cwww, C&+ado, U S.A., S-9&tobw 1SSS ThlspDpww Dss Ac+odhwposwawm by an SPE PIwmm Comm !ollvwng mvwu d Worn@on -mod In an abstrni submdtod by ttm quthor(s) Cmtmts d h P+OI ũ ,~* b~by b Socmty 01 Pttwhum Enwmma and w subwci to con'uXW by WN wtlwf(s) TIM mdwwl, os pfowti, don not n~n~rstied any posmon d thoSoc&ty d P$twlwm EnglMws S8 ofl'afa, of rnombws PWWX grwnt.d al SPE mnlimJs qm zubjul h publii roww by EdRon81 Cammtltaes d Uw .S.xuty d Petroleum Engimua. Pwmh@e.n 10 CQPY is ro$bwM to an sbsbad of no! more man 301 words Illwbaf.ow q d b + Tlw olmba.a should amtmn COWMCUOUSack-mem G4 wlwm qti by whom ttm PD.I wns presented Wmc Llbrwan, SPE, P O so. S328S6 RKlwdxM, TX 7S2UN&3S. U.SA tax 01-21 4-S52.W35 AbstractConsistently and continuously applied fracturing, reservoir and production engineering used to increase recovery from a marginal production low-permeability and low-pressure dry-gas reservoir has approximately doubled the initial production rate and the estimated ultimate recovery expected from new wells. The on-going costs of the additional engineering and technology io sustain the increased productivity of this reservoir is a few cents per MCF. As a result, new. wells can be drilled and produced economically, the selection criteria for acceptable infill and exploration locations is greatly expanded, and proven gas reserves for both the new wells and the region are increased. Significant performance improvement can be achieved using a minimum number of wells, consistently collected data, and continuous review of performance changes caused by completion procedures changes. Exploitation optimization is an evolutionary process, not a one time study.
Summary Two gas fields offshore Sarawak, Malaysia, are characterized by heavily karstified carbonate reservoirs. These reservoirs are typified by significant porosity and permeability heterogeneities such that large fluid-loss zones are commonly encountered while drilling the reservoir section. The drilling strategy for the subsea development wells called for the use of a solid drill-in liner as a contingency should major losses be encountered while drilling the reservoir section. This strategy stands opposed to using a predrilled liner. The use of a drill-in liner, however, necessitates perforating. Typically, completions in such reservoirs are acid stimulated to maximize productivity. Complete stimulation of the reservoir section is very difficult to achieve using acid-diversion techniques in a karstic environment because of the large variability in the permeability. Propellant-assisted perforating was considered because it achieves effective stimulation diversion, equally across the entire perforated interval. Modeling work indicated that fracture lengths of 5 ft or longer would propagate from each perforation tunnel. Such large propagation lengths greatly increased the probability of connecting the completion directly to karstic features in the reservoir, to provide enhanced inflow performance. Another significant benefit was that perforation and stimulation would take place in a single operation, thereby reducing the health, safety, and environment (HSE) risk associated with handling acid, while saving rig time. Two successful field trials, totaling three wells, will be presented in detail to illustrate this application for propellant-assisted perforating. The data presented include prejob planning, execution, and post-job inflow-performance analysis. The result was three world-class, low-drawdown wells, each capable of delivering 200 MMscf/D, providing well capacity that met or exceeded expectations. Applying the propellant-assisted perforating technique in three subsea wells in heavily karstified carbonate reservoirs has proved that this technique can offer a highly effective stimulation method across the entire perforated interval in such an environment. Additionally, its usage eliminates the need for conventional, separate acid stimulation, saving rig time and costs while reducing HSE risks.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.