Gulfsands Petroleum which is involved in oil and gas production, exploration and development activities in Syria, Iraq, Tunisia, Italy and the US, has released an update on its operations in Syria.
Twaiba 1 Exploration Well
The Twaiba 1 exploration well, located approximately 7 kilometers to the north of the Khurbet East Field, has been drilled to a total depth of 2,016 metres measured depth (MD) (2,016 metres true vertical depth). Gulfsands which assumed a 100% working interest in drilling the operation is sole risk operator.
Preliminary interpretation of drilling data and wire-line logs has identified two net pay intervals within the regionally productive Cretaceous aged reservoir section, the “Shiranish” and “Massive” Formations:
The Shiranish Formation contains a net pay section of approximately 31 metres, from 1,872-2,003 metres MD, with average porosity of approximately 21%. A definitive oil-water contact is not identified for this reservoir interval.
Preliminary indications from observation of cuttings and core recovered from the well-bore suggests that the oil present at the Twaiba location may be of lower API gravity than that of the adjacent Khurbet East Field, but may be similar to that found in other fields in the immediate area.
A production liner has been cemented in place over this interval, and a production test will be undertaken over this interval once testing has been completed on the slightly deeper Massive Formation reservoir.
The Massive Formation contains a net reservoir section of approximately 8 metres, with average porosity of approximately 15%. An open-hole drill-stem test will be conducted over the interval 1,952 — 1,970 metres.
Gulfsands said that the results of the testing programme will be the subject of a further news release. It is estimated that the net cost to Gulfsands of drilling and testing the Twaiba-1 well will be approximately US$1 million after cost recovery.
Following completion of the testing programme the well will be suspended as a potential future production well. After completion of operations, the rig will be moved to the Abu Ghazal 1 location. Further operations at Twaiba, including any appraisal drilling, will be considered once the testing and other results have been fully analysed.
Zahraa 1 Exploration Well
The Zahraa 1 exploration well has been drilled to a total depth of 2,450 metres MD (2,445 metres true vertical depth). Like the Twaiba 1 exploration well, Gulfsands is also the sole risk operator with 100% working interest of the drilling operation.
The Zahraa 1 well encountered the top of the Shiranish Formation, the shallowest potentially productive reservoir for the Zahraa prospect, at a depth of 1,802 m MD or approximately 121 metres higher than the pre-drill prognosis, and the base of the Cretaceous aged section was encountered at 2,394 metres MD, or approximately 105 metres higher than the pre-drill prognosis. Due to very poor hole conditions it was not possible to obtain a suite of wire-line logs over the reservoir objective intervals in order to fully evaluate the drilled section. However, only minor oil and gas shows were observed whilst drilling through the Cretaceous aged section.
The Zahraa 1 well has therefore been suspended, and the data obtained from the well will be fully analysed prior to any further drilling on the Zahraa structure. It is estimated that the net cost to Gulfsands of drilling operations on the Zahraa 1 well will be approximately $1.3 million after cost recovery.
The rig has now moved to the KHE-101 location on the Khurbet East oil field.
3D Seismic Acquisition Programme Completed
The 2010 3D seismic acquisition programme has been completed with the acquisition of approximately 1,060 square kilometers of 3D seismic data. The data acquired have been shipped for the processing in Cairo and a preliminary, or “fast-track”, volume is expected to be available for interpretation during the first quarter with the final volume scheduled for delivery during the second quarter.
Khurbet East and Yousefieh Oil Production
As at 31st December 2010, aggregate daily oil production from the Khurbet East and Yousefieh Fields was approximately 20,800 barrels of oil per day (“bopd”) representing an approximate 21% increase over the daily oil production rate achieved as of 31st December 2009. Total aggregate oil production from the Khurbet East and Yousefieh oil fields has now exceeded 12.6 million barrels of oil.
Commenting on the progress of the operations, Gulfsands CEO Ric Malcolm said: “The results from the Twaiba exploration well are very encouraging, as the net pay identified on wire-line logs is in excess of that assumed in our own pre-drill “high case” estimates of speculative reserves of 9 million barrels. The forthcoming production test should provide additional valuable information required to understand the potential commercial significance of the hydrocarbons encountered in this sole risked well. The drilling results at Zahraa are disappointing, but the data will be reviewed to determine if there is any remaining potential on the Zahraa structure. The performance of the two producing fields, Khurbet East and Yousefieh, remains exceptional and we continue to identify opportunities to maximise the value of these assets.”
(Source arabianoilandgas)
