Gas discovery at DOB-1 exploration well

Gulfsands Petroleum plc, the oil and gas production, exploration and development company with activities in Syria, Morocco, Tunisia and Colombia has provided an update on drilling activities in Morocco.

Morocco: Rharb Drilling Programme

Drilling operations on the Douar Ouled Balkhair 1 gas exploration well located within the Rharb Centre Permit in Northern Morocco have now concluded with the DOB-1 well being confirmed as a gas discovery. During testing of this discovery, gas flowed to surface during the well's clean up flow period at rates in excess of 10 million standard ft3 per day. DOB-1 has now been suspended as a future gas production well.

The DOB-1 well is the third well to be drilled on the Rharb Centre permit based on the company's interpretation of 3D seismic survey data acquired by Gulfsands on the permit area in the second half of 2013. The first two wells to be drilled on this permit were also successful in finding gas and flowing it to surface, at wells LTU-1 and DRC-1.

The DOB-1 well was drilled to a Total Depth of 1140m Measured Depth and encountered the primary reservoir target interval on prognosis at a depth of approximately 808m MD. Significantly elevated gas readings obtained while drilling, as well as interpretation of geological samples and wire line logs, indicated the presence of a gas bearing sandstone reservoir section of excellent quality. Detailed petrophysical evaluation of wireline logs over the primary target yielded an interpretation indicating a 4.2 metres gross sand thickness, with a net sand thickness of 3.7m and evaluated average gas saturation of 70% and average porosity of 34%.

The DOB-1 well was cemented and perforated over the primary reservoir interval, completed and then subjected to a flow testing and pressure survey period for evaluation of well flow performance and connected gas volumes. During initial clean up flow operations over this reservoir, the well produced natural gas at an estimated rate in excess of 10 million standard ft3 per day on a 48/64th inch choke setting. During subsequent multi-rate flow testing, a stable flow of 6.2 million standard ft3 per day was established for a period of 4 hours on a 32/64th inch choke setting, with a final wellhead flowing pressure of 1084 psi. No formation water was detected in the gas production stream during testing operations.

The secondary reservoir target interval for the well was encountered at a depth of approximately 1075m MD. Significantly elevated gas readings were encountered over the interval 1075-1127m MD. However, after the completion of wire line logging operations, mechanical problems with well bore integrity above this interval prevented further access to or production testing of this deeper potential reservoir. The company is currently reviewing all available data in order to determine the optimal path for further exploration of this reservoir section, which may include a re-deepening of this well at a later date post production of the shallower gas zone, potentially employing in this future operation a modified and strengthened well design.

Drilling and well testing operations for DOB-1 were completed on plan and on budget. Upon completion of operations the Company plans to suspend drilling operations whilst a detailed technical assessment is conducted over the DOB-1 and DRC-1 gas discoveries that will include the identification of potential locations for further drilling in the near vicinity of these discoveries.

Mahdi Sajjad, the company's CEO commented:

"We are delighted with the results of the drilling and flow testing operations at well DOB-1. This is the third consecutive successful exploration drilling result that the Company has achieved in Morocco utilising the 3D seismic data acquired and processed in 2013-2014.

We are continuing with our efforts to commence production from these discoveries and are receiving much appreciated assistance from ONHYM to ensure this is achieved as soon as possible".

Edited from various sources by Joe Green

Published on 23/02/2015

Get your FREE Oilfield Technology magazine »

Get your FREE trial of Hydrocarbon Engineering magazine »

Get your FREE trial of World Pipelines magazine »


Related articles

Morocco’s progress towards energy transition

The International Energy Agency reports that strong incentives on energy access and renewable energy as well as subsidy reform reflect the Moroccan government’s determination to fulfill the aims of its Energy Strategy.

Africa energy outlook

Maria van der Hoeven, Executive Director, International Energy Agency, launches the World Energy Outlook 2014 Special Report: Africa Energy Outlook.

North African oil, gas, and the development of the refining industry

This article provides an overview of the North African hydrocarbon industry, assesses its vital regions and considers a future of promise to coincide with the global economic recovery.

Recommend magazines

  Oilfield Technology