Oilex Advances Drilling on Third Well at Cambay Field

Oilex advised that drilling commenced at Cambay-73, the third well in the Cambay Field appraisal program, on July 24, 2008. The well is currently at a depth of 597 meters preparing to run 133/8' casing. A wireline testing unit has been deployed at Cambay-19Z and has run more successful tests on the Basal EP IV oil zone while waiting for the arrival of a workover rig to begin Drillstem Test #2 (DST #2).

The following table gives a summary of current and planned operations.

Cambay-19Z appraisal well


  • Primary: Basal EP IV - oil
  • Eocene EP III and EP IV - oil
  • Secondary: Oligocene OS II - gas
  • Miocene Basal Sandstone - gas
  • Deccan Fractured Basement - oil


Testing at Basal EP IV oil zone while waiting on the arrival of a workover rig to begin DST #2 over deeper Basal EP IV prospective intervals.


A wireline testing unit was successfully deployed and re-entered  the well bore to conduct additional tests at the level of the Basal EP IV oil zone. The workover rig has been contracted and is expected to be on site within the next 10-14 days.  DST #2 will be carried out over an interval of 16 metres of potential oil pay below the zone that was tested by DST #1.


Additional testing has confirmed the rates from the initial test and the well will continue to produce oil until the workover rig arrives.

DST #1 successfully flowed oil to surface at a rate of over 800 barrels of oil per day (BOPD) for the first hour of the test and later stabilized at a rate of 120 BOPD on 1' choke during the final phase of the 32 hour flow period. No formation water was produced with the oil which is 410- 430 API gravity.

The Basal EP IV zone is present in at least three old wells on the Western High Block. These old wells were either not tested or were poorly evaluated and appear to have a similar log response to the zone that was successfully tested in Cambay-19Z.

Preliminary indications from seismic and the analogous well logs are that the Basal EP IV may extend across the Western High Block.

Cambay-73 appraisal well


  • Primary: Oligocene OS II - gas
  • Eocene EP III and EP IV - gas
  • Basal EP IV - oil
  • Secondary: Miocene Basal Sandstone - gas
  • Deccan Fractured Basement - oil

Current Depth: 597 meters

Total Depth (TD): 2,205 meters (planned)


Preparing to run 133/8' casing before drilling ahead in 121/4' hole to the first of the main objective horizons at about 1,460 meters.


Cambay-73 is a vertical well that has been located to drill the OS II and EP III-IV primary objectives on the eastern side of thefault that separates the Western High Block from the Basin Gas Area. It is anticipated that both zones will be gas bearing in this well.

The well is also designed to intersect the Basal EP IV oil zone on the Western High Block at a favorable structural location.

Participants in the Cambay Production Sharing Contract are:

Joint Venture Party Participating Interest: Oilex Ltd (Operator) 30% Oilex NL Holdings (India) Limited (100% owned by Oilex 15% Ltd); Gujarat State Petroleum Corporation 55%.