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Collaborating Authors
TGT Oilfield Service
Multiphase Inflow Monitoring in Horizontal Wells Producing from Oil Rims Based on the Advanced Production Logging Suite Data
Minakhmetova, Roza (TGT Oilfield Services) | Aslanyan, Irina (TGT Oilfield Services) | Nagimov, Vener (TGT Oilfield Services) | Shigapov, Llnur (TGT Oilfield Services) | Kosolapov, Vladimir (GAZPROMNEFT-YAMAL LLC) | Virt, Vitaliy (GAZPROMNEFT-YAMAL LLC)
Abstract Today, oil reservoirs with a gas cap on top are mainly developed by drilling horizontal wells of various design. In the course of well operation, early increase in gas-oil ratio or water cut can often be observed. These may be caused by both well integrity failure and the geology feature of the target formation when formation water breaks through from the bottom of the producing formation and gas inflows from the top of the reservoir as a result of coning. One of the ways of controlling unwanted water and gas production sources and reservoir fluid production rates is monitoring of production profiles along the horizontal sections of the well using a reservoir-oriented production logging survey. This paper describes an example of such monitoring at a horizontal well drilled into the oil-rim reservoir at the Novoportovskoye field. The paper provides the results of a series of logging surveys performed in 2, 18 and 24 months after the well commissioning. The first (reference) survey was performed at the earliest stage of the well production; the second and the third ones - when the gas-oil ratio started to increase. The advanced production logging survey included high-precision temperature logging, distributed capacitance measurements and spectral acoustic logging. The spectral acoustic logging data identified the producing intervals of the reservoir along the horizontal section of the well. According to the first survey results, the production fluid was flowing uniformly along the wellbore. The third and second surveys had identified the intervals of gas breakthrough in the reservoir. After all the survey results had been compared to one another, it was identified that the gas breakthrough could have been localized even during the first logging survey. In each survey, the multiphase inflow profiling was perfomed using a temperature modelling. Information generated as a result of production logging survey in the horizontal well allows localizing and predicting gas breakthroughs in wells drilled in oil rims. Using this data, such gas breakthroughs may be immediately prevented. The data can also be used when designing new wells to increase the efficiency of development of such fields.
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.54)
- Geology > Rock Type (0.47)
The Method of Localization of Residual Oil on the Basis of Complex Multi-Well Diagnostics and Calibration of the Hydrodynamic Model
Zhdanov, Ivan (Gazpromneft Science & Technology Centre) | Kotezhekov, Victor (Gazpromneft Science & Technology Centre) | Margarit, Andrei (Gazpromneft Science & Technology Centre)
Summary Currently, many fields in Russia are at the final development stage known not only for a decreasing percentage of active recoverable reserves, but also for a growing share of hard-to-recover reserves, confined, for example, to complex reservoirs featuring primarily highly zonal and layered heterogeneity. In this context, the priority issue is to spot areas containing remaining reserves with a view to subsequently recovering them. Obviously, this issue cannot be tackled without the aid of advanced technologies of crosswell formation evaluation. This publication presents the remaining reserves detection technology involving integrated multi-well diagnostics and reservoir flow model (RFM) [1] calibration techniques focused on refining development targets and shaping an appropriate RFM to come up with an action plan to tap reserves and ramp up production at the Company's current assets.
Quantification of Reservoir Flow using Noise and Temperature Logging
Hammad, Muhammad (Pakistan Petroleum Limited) | Ahmad, Muneeb (Pakistan Petroleum Limited) | Siddiqi, Sarmad S. (Pakistan Petroleum Limited) | Siddiqui, Amir M. (Black Gold Oilfield Services) | Kuzyutin, Roman (TGT Oilfield Services)
Abstract One of the main challenges in a water drive gas reservoir is to track fluid movement as water breakthroughs occur frequently with depletion. The understanding becomes more challenging when the structure contains seismic/sub-seismic faults with the associated drive mechanism being edge water. Moreover, surveillance options are also limited for such reservoirs if they are producing through short string of a dual completion. Dual string completion is a cost-efficient technique as multiple reservoirs can be completed in a single wellbore. However, surveillance / logging cannot be performed across perforation intervals of upper reservoir due to operational concerns. As a result, the short string production can only be surveyed through the long string with the help of tools which have deep scanning radius extending beyond tubing and casing into the formation. One example of these advanced tools is Spectral Noise Logging (SNL) combined with High Precision Temperature (HPT) logging which have been used worldwide for such applications. This paper presents SNL-HPT results of two dual string wells completed in Eocene age carbonate reservoir. A total of nine wells are producing from the reservoir and the Gas water contact (GWC) was not encountered in any of the wells. Selected wells are located on either side of the structure with Well A producing 1.0 MMscfd gas and 1300 bbls/d water while Well B is producing 2.0 MMscfd gas and 800 bbls/d water. The reason of high water production from both wells was initially attributed to the presence of a high permeability streak in lower part of the reservoir and/or possibility of channeling behind casing. However, results of the SNL-HPT in both wells indicate signatures of fault or fracture flow. The major water production is coming from the middle and lower part of reservoir. Based on these results, the trajectory of one development well was optimized. The perforation interval of another well was also decided in accordance with the SNL-HPT findings, which resulted in water-free gas production. Quantification of reservoir flow profile in short string of dual completion well is possible through noise and temperature logging. This information would help in deciding appropriate workover strategy in existing wells and completion design of new development wells.
- North America > United States (1.00)
- Asia > Pakistan (0.71)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Interpretation (0.34)
- North America > Canada > Alberta > Athabasca Oil Sands > Western Canada Sedimentary Basin > Alberta Basin > Black Gold Oil Sands Project (0.98)
- Asia > Pakistan > Sindh > Kashmore District > North Indus Basin > Kandhkot Field (0.98)
Correctly Allocating Injected Gas to Targeted Zones by Integrating Data from Spectral Noise and Temperature Logs
Alabd, Khaled Mohamed (ADCO) | Riza, Faizal (ADCO) | Al Nuaimi, Nawal (ADCO) | Fawzy, Ahmed (ADCO) | Moussa, Mohamed (ADCO) | Shnaib, Fathi (TGT) | El Sheshtawy, Mohamed (TGT) | Volkov, Maxim (TGT) | Nagimov, Vener (TGT) | Vorozhikhin, Sergey (TGT)
Abstract Gas Injection alone, or in Water Alternating Gas (WAG) mode to improve oil recovery (IOR) has been widely applied since the late 1950s. The incremental oil recovery attributed to IOR has been generally estimated at 5 – 10% over Secondary Recovery (water injection alone), primarily due to preferential sweep under gravitational effects. Theoretically, water and gas injection tend to have preferential sweep due to gravitational effects and formation characteristics. In practice, however, it is an operational challenge to obtain a uniform sweep across the reservoir. One of the biggest challenges in understanding the injection behavior in gas injection wells using the conventional production logging approach is to identify the exact entry points, and to determine a representative injection profile to the actual injection volumes. Mechanical spinners provide inflow profiles within the borehole that in many cases doesn't reflect the actual gas behavior inside the addressed layers beyond the entry point. Gas containment in the reservoir and within the targeted zone is one of the biggest hurdles. Unlike pilot projects, in full field application, channeling, cross flows, out of zone injection and premature breakthrough often occur, resulting in wasting gas, delayed response, and lower than expected recovery. Effective reservoir management requires active & efficient reservoir surveillance in order to optimize well & reservoir performance. It is, therefore, critical to design a proactive program for data acquisition, integrating that data into a knowledge data base and to transform that knowledge into valuable information to guide future operations for remedial work, recompletion, infill drilling, and further development programs. This paper discusses in detail how the injection profile geometry was described, and injected gas volumes were correctly allocated to targeted zones in one of the giant onshore oil fields in Abu Dhabi, UAE operated by ADCO, using integrated HPT (High Precision Temperature) and SNL (Spectral Noise Logging). Data from HPT and SNL logging package was integrated to successfully monitor water injection, identify cross-flows and locate casing leaks in injection wells for the past 2-3 years. Based on the performance, reliability, and accuracy of this advanced logging technology, ADCO has decided to use the same tools and temperature simulation to track gas injection, gas flow profile behind pipe, and to monitor any communication with any extraneous thief zones.