... Abstract Cementing the upper casing strings in wells that traverse shallow gas sands has often been a troublesome process. The top zones are often weak and this prevents the use of high-density slurries that are gas-tight. When a combination of low-density lead slurry and high-density tail...

... Abstract Tunu Shallow Zone (TSZ) is one of producing zone in Tunu Field. Tunu Field is a giant gas field located in the present-day Mahakam Delta, East Kalimantan, Indonesia. The gas reservoirs are scattered along the Tunu Shallow Zone and correspond with fluvio-deltaic series and main...

..., with the increasing attention on well integrity and well plug and abandonment (P&A), permanent zonal isolation in shallow gas zone becomes a critical issue for the industry. The growth in P&A activities faces major challenges especially on the gas leaks due to poor zonal isolation. Abstract Methane gas...

... ABSTRACT The extreme shallow water area of Zhangjuhe is a portion of the complex-forms oil-gas rich area in the rifted basin of Bohai Bay. The Zhangxi Structure in this area is a rollover anticline and the Zhangdong Structure is a large-scale faulted anticline zone controlled by the basement...

... Abstract The Semberah field is one of the main oil and gas producing areas operated by VICO Indonesia in East Kalimantan, Indonesia. Production from this field has been focused mostly from shallow-level reservoir (C-I intervals). After production of more than 30 years, the shallow and high...

... inaccessible because they are shallow (low-pressure) with little or no caprock with top water zones. Solvent addition allows reduced operating pressure, which makes it amenable for low pressure, shallow reservoirs. This research examines ES-SAGD, with non-condensable gas co-injection, in reservoirs with top...

... shallow gas area, all precautions must be taken to prevent gas flow whilst drilling. This is possible by adequate mud weight selection allowing sufficient overbalance throughout the complete drilling, casing, and cementing operations ensuring shallow gas zone is properly sealed and isolated before...

... Summary Turning ray amplitude inversion is a deterministic seismic processing algorithm that uses first-arrival data to generate a near-surface attenuation model that is used to compensate prestack or poststack reflection data for amplitude loss caused by shallow gas zones. Quantitative...

... management of shallow gas zones and their impact on well construction, design and integrity. The well Operator experienced a severe loss of well control during drilling operations in the Western Block of Talang Jimar field in Sumatra. The field is mature and the well was considered routine in a series...

... technology are referred to as constraints. Constraints identified are (1) filled or shallow buried channels; (2) hydrocarbon seeps, seep mounds, and gas craters; (3) gas-charged sediments; and (4) pressurized shallow gas zones. - INTRODUCTION GEOLOGIC HAZARDS AND CONSTRAINTS Geologic hazards are any geologic...

... for success. Introduction Shallow gas can significantly reduce P-wave velocity and generate strong lateral variations in the overburden velocity. Consequently, complex seismic ray paths and non-hyperbolic moveout are often found in association with shallow gas zones, making it very difficult to image deep...

... Abstract Shallow water flow was severely hindering further drilling in the North Sea exploration well 16/1-9, "Draupne". The water depth was 111.5m. The 20" casing was set at 590m; above a shallow gas zone. After mounting the Blow Out Preventer (BOP), drilling the 17 1/2" section started...

.... A comparison with a larger 17 1/2" hole has demonstrated the lack of shallow gas kick control at the same permeabilities and even lower gas pressures. Dynamic circulation control of a shallow gas kick as a function of time after penetration of the gas zone, irrespective of when a kick is detected, shows...

... a shallow gas zone. After mounting the Blow Out Preventer (BOP), drilling the 17 ½" section started and continued for a few 100 meters. The wellhead was routinely inspected using an ROV (Remotely Operated Vessel). After some time, a tiny flow was observed around the wellhead. The flow increased in strength...

... casing did not achieve effective zonal isolation of the shallow-gas zone. Several techniques were unsuccessful, including the use of conventional lightweight gas-tight cement slurries, two-stage cementing operations with conventional gas migration control slurries, and injection of sodium silicate...

... bearing sands should show a strong increase in amplitude with offset on a CDP gather. He showed many examples where this was the case. Figures #1 and Y2 show a shallow gas zone which conforms to Ostrander's model. The amplitudes show a strong increase with increasing offset. These two figures also show...