PetroNeft 'Disappointed' by Lineynoye Well Results

PetroNeft Resources plc, the owner and operator of Licenses 61 and 67, Tomsk Oblast, Russian Federation, announced an update on its operations.


  • Year end production reached approximately 3,000 bopd; current production steady at 2,300 bopd
    • Lineynoye Pad 1 responded to pressure maintenance
    • Lineynoye Pad 2 fracture results below expectations
  • Arbuzovskoye Development ahead of schedule
    • Pipeline production expected to commence in 2Q 2012
    • Plans for 10 new production wells in 2012 progressing ahead of schedule
  • Ledovaya 2a exploration well
    • oil encountered in primary Upper Jurassic interval
    • oil discovered in secondary Lower Cretaceous interval
  • Cheremshanskaya No. 3 exploration well
    • testing successfully completed; three separate oil pools discovered
    • primary Upper Jurassic J1-3 interval tests good quality oil + water
    • secondary Upper Jurassic J1-1 + Bazhenov interval tests high quality oil

License 61 - Lineynoye field development program

Total production increased to approximately 3,000 bopd at the end of the year with the benefit of Pad 1 water injection and initial positive results from the Pad 2 fracture stimulation program. In recent weeks production has declined to 2,300 bopd due to a number of issues at Pad 2.

Pad 1 wells have responded to the pressure maintenance program (water injection) that we initiated last summer using three injection wells and the production decline has now halted in many wells and in some cases started to increase. We are encouraged with the water flood response on the Pad 1 wells.

A fracture stimulation program for the Pad 2 wells was carried out in November 2011. The initial response was positive however, in recent weeks, production from Pad 2 wells has decreased due to higher than expected well decline rates and the clean-up of water associated with the Pad 2 fracture program being less than expected.

The Pad 2 wells have not performed as well as those in Pad 1 following fracture stimulation. We have commenced a number of studies on the Pad 2 wells, including a field wide pressure transient test of individual wells in order to understand the difference in results.

In some of the Pad 2 wells the reservoir pressure has declined and is a factor in the production decline. We are currently converting one of the Pad 2 wells to a water injection well with the aim of restoring some of the reservoir pressure. Additional wells will be converted as part of a normal water injection and pressure maintenance program.

We currently expect that it will take at least six months before we can complete these studies and work programs. The five well fracture stimulation program planned for the Lineynoye field in 1Q 2012, has therefore been postponed until we can better understand these differences and how best to deal with them.

In the meantime development activities will be focused on the Arbuzovskoye field.

License 61 - Arbuzovskoye Pilot Development Program

The Pilot Production Design for the Arbuzovskoye oil field was approved by the Russian State Central Development Committee in November 2011. Construction of a 10 km pipeline from the Lineynoye facilities to Arbuzovskoye and mobilization of the drilling rig and supplies to drill up to 10 new production wells in 2012 is progressing ahead of schedule. Pipeline production is now expected to commence in 2Q 2012. Arbuzovskoye contains 2P reserves of 13.2 million barrels of oil according to independent reserve auditors Ryder Scott. The Arbuzovskoye No. 1 discovery well demonstrated good reservoir properties and produced a stabilized flow of 176 bopd on an 8 mm choke and we expect good initial production that can be augmented later with fracture stimulation.

License 67 - Ledovaya No. 2a well

The Ledovaya No. 2a well was spudded on December 5, 2011. The well was targeting oil in both the Lower Cretaceous and Upper Jurassic intervals. Based on the initial evaluation of log and core data the primary Upper Jurassic J1/1-2 reservoir interval contains about 32.8 feet (10 meters) of high quality sandstone. The top five meters of this are interpreted as oil bearing whereas the lower five meter zone is interpreted to be an oil plus water transitional zone. Testing of the interval is currently ongoing.

Based on the preliminary interpretation of core and log data the well has discovered a new oil pool in the secondary objective Lower Cretaceous interval. Data indicates that a sandstone interval from 8,251 to 8,278 feet (2,515 to 2,523 meters) contains 5.25 feet (1.6 meters) of net oil pay and 9.51 feet (2.9 meters) of possible oil pay. The zone will eventually need to be flow tested behind casing for confirmation. However, at this stage we are pleased with the result given that the same interval is productive at the neighboring Stolbovoye field which is located 15 miles (24 kilometers) to the south.

License 67 - Cheremshanskaya No. 3 well

Testing of the primary Upper Jurassic J1-3 interval has been successfully completed. The interval which was initially interpreted to be water bearing, has proved to be oil bearing. Based on the cased hole testing the interval is interpreted to contain 21.33 feet (6.5 meters) of net pay. Average inflow was about 44 bfpd consisting of 20.3 percent oil and 79.7 percent formation water. The oil is good quality with a 34 degrees API.

The J1-3 interval was then isolated with a cement packer and the J1-1 + Bazhenov interval was tested. This interval consisted of 3.9 feet (1.2 meters) of net pay in the J1-1 plus 9.84 feet (3 meters) of fractured shale at the base of the Bazhenov Formation. Average oil inflow from the J1-1 + Bazhenov was about 12.6 bopd of high quality oil with a 40 degrees API.

In summary, three separate oil pools have been now discovered and established in the Cheremshanskoye oil field - the J14-15, the J1-3 and the J1-1 + Bazhenov. The area of the field is very large encompassing almost 15 square miles (40 square kilometers) and further delineation and pilot testing will be required to assess the true size of the field and ultimate development plan. There are large producing fields nearby with similar characteristics and the strong indications are that Cheremshanskoye will prove to be a substantial discovery upon further delineation.

Dennis Francis, Chief Executive Officer of PetroNeft Resources plc commented, "We are disappointed with the results of the Pad 2 fracture stimulation program, especially when compared to the improving Pad 1 results. We are now studying the results to see what can be done to manage the wells. Development focus will now turn to building the production profile at Arbuzovskoye and assessing other near term development opportunities.

"The Ledovaya result is encouraging and we await the test results from the Upper Jurassic zone. We are delighted that testing at Cheremshanskoye has confirmed oil in our primary Upper Jurassic J1-3 interval and demonstrated three separate oil pools in the field. Given the large area of the structure and nature of the analogue fields nearby we feel that with further delineation Cheremshanskoye will prove to be a major oil field."


Click on the button below to add a comment.
Post a Comment
Generated by readers, the comments included herein do not reflect the views and opinions of Rigzone. All comments are subject to editorial review. Off-topic, inappropriate or insulting comments will be removed.

Related Companies

Our Privacy Pledge

Most Popular Articles

From the Career Center
Jobs that may interest you
Petroleum / Facilities Engineering Specialist - Offshore
Expertise: Petroleum Engineering
Location: Houston, TX
Petroleum Engineer
Expertise: Petroleum Engineering
Location: Houston, TX
Reservoir Engineering (Oil / Gas Reservoir Management)
Expertise: Reservoir Engineering
Location: Houston, TX
search for more jobs

Brent Crude Oil : $51.78/BBL 0.77%
Light Crude Oil : $50.85/BBL 0.83%
Natural Gas : $2.99/MMBtu 4.77%
Updated in last 24 hours