Bridge énergies , ENVIRONMENTALLY RESPONSIBLE PETROLEUM PRODUCTION IN THE PARIS BASIN
The Nonville lease in Seine-et-Marne, carefully considered oil extraction
Bridge énergies , an independent French company, was set up in 2006 to carry out hydrocarbons exploration and production in the Paris Basin. Its head offices are at Châtellerault (département 86, France). Bridge énergies has just one mining title: the Nonville lease.
In 2019, Bridge énergies ’s production of oil represented 0.49% of France’s national production and 0.84% of production from the Paris Basin.
To support its development, Bridge énergies conducts substantial geoscience studies that include in-depth geological studies, reservoir studies and geophysical studies (acquisition of 318 geophysical lines, data reprocessing, interpretation, and new structural maps).
at the heart of the Paris Basin
Bridge énergies was set up in 2006 to carry out hydrocarbons exploration and production in the Paris Basin. Its head offices are at Châtellerault (département 86, France). Bridge énergies has just one mineral title: the Nonville lease.
LOCAL OIL IN SAFE HANDS,
THE EFFECTIVE ALTERNATIVE TO IMPORTING
Oil was first discovered in the Paris Basin in the 1950s. For decades, the skills and techniques for tapping into the resources beneath French soil have been evolving, and in ways that respect the environment.
Bridge énergies is working within the legacy of this know-how. Our activity has a full role to play in France’s energy mix, as it has an extremely low carbon footprint compared with that of imported oil. Crude oil produced in France actually emits three times less CO2 than imported crude. At present, oil produced in France each year represents 1% of the country’s consumption; in-country production avoids nearly 100,000 tonnes of CO2 emissions a year compared to imported oil.
The Nonville reservoir was discovered at the end of the 1950s, under the “Villemer” lease name. The Autonomous Petroleum Administration (RAP) would drill 17 wells between 1959 and 1962 (VM101 to VM121), and then the ERAP (Enterprise for Petroleum Research and Activity – ELF) drilled wells VM122 and VM123 in 1967 and 1972 respectively. Subsequently, Elf Aquitaine drilled wells VM124 and VM125 in 1978, and VM126 in 1988, which was to be the last. Elf decided to close the reservoir in 1994, though the petroleum resources were not depleted; the economic conditions at the time favored the development of larger fields overseas.
The lease known as Nonville is located in France’s Seine-et-Marne département. It has a surface area of 10 km², and extends mainly across the Nonville district but also includes parts of the Darvault, Genevraye and Villemer districts.
CAREFULLY CONSIDERED DRILLING TECHNIQUES THAT WORK WITH THE ENVIRONMENT
The different well types:
Wells may be drilled vertically, horizontally or deviated. These directional drilling techniques help to minimize the environmental impact at the surface, and also the economic impact.
The platform currently in place at Nonville has two producing wells:
– NVL1, vertical
– NVL2H, horizontal
To produce oil, “producer” completion equipment is run into the wells to bring the fluid up to the surface.
The two wells on the Nonville site have 2 different production systems: PCM technology (Moineau progressive cavity pump) and GE ESP technology (electric submersible pump). Other pumping systems exist, but they are not used on the Nonville site.
Well NVL1 is equipped with rotary pumping, using a PCP (progressive cavity pump) or Moineau pump. A rotor, comprising a steel helical screw, turns inside an elastomer stator that is molded internally in a double helix shape. The rotation produces a chain of cavities running all along the axis, and if the pump is vertical, this pulls the fluid from the bottom to the top of the spiral, at a flow-rate directly proportional to the helical screw’s rotation speed.
Well NVL2H is equipped with centrifugal pumping, and has an electric submersible pump (ESP). The centrifugal pump is lowered on its side into the casing, suspended on the end of the production tubing. Electrical energy is sent to the motor via a cable that is unwound as the tubing is lowered, and attached to the tubing with clamps. The diagram shows the components of this system. A centrifugal pump may comprise hundreds of stages. Installing this kind of facility enables production from highly deviated wells that may have high flow-rates (in excess of 1000 m3/day). All that remains on the surface is the wellhead and an electrical transformer station, which may be located remotely. This type of pumping blends into the landscape very well.
It is necessary to carry out work on oil wells for preventive maintenance or to repair any equipment breakdown. When this takes place, a pulling rig or workover rig and its personnel are brought in to perform the maintenance. These rigs are small and suited to the purposes of this work.
The effluent (a mixture of oil and water) extracted from the wells goes into a two-phase separator.
Due simply to the difference in their densities, the oil and water separate from each other.
The oil is sent to a storage tank before being shipped to a refinery in a tank truck.
The water is sent into a buffer tank, and subsequently injected back into the reservoir it came from by means of an injection well (NVL101).
OUR SITE RESTORATION METHOD AND COMPLIANCE
As regards closure of a site or well, Bridge énergies has made commitments and planned the necessary actions depending on the site’s development (number of wells, surface area).
The end of production comprises two stages: ceasing works and then restoring the site.
Therefore, the first stage is to shut down and plug the well(s). For this purpose, Bridge énergies submits a well plugging program to the prefecture before the start of works. During the plugging operations, various measures are taken to ensure that the well is 100% sealed.
Bridge énergies will then issue a statement declaring the permanent cessation of works and of mining facility use (DADT in French), and this will be sent to the Prefecture at least 6 months before the end of oil production. Therefore, the site restitution program is submitted to the Prefecture for approval before this work begins. Upstream, a full environmental diagnosis will be run to evaluate the condition of the site environment; this will enable clean-up work to begin, if necessary.
The DADT notice is accompanied by a Prefectoral order authorizing restoration work. When this work has finished, Bridge énergies will send the Prefecture a work completion report, with all the necessary supporting documents and a statement of restoration conformity from the landowner(s).
Once this work completion file has been examined by the Prefecture, the latter can issue a Prefectoral order lifting the mining regulations, which stipulates that the operator has entirely fulfilled its site restoration obligations. Only at this point will Bridge énergies be released from its responsibility, which then passes to the French State.
The State, which is responsible for post-mining activities, takes great care to ensure that mining operators uphold their site abandonment commitments.