Molikpak

The Molikpak platform (PA-A) was installed on the Astokhskoy area of ​​the Piltun-Astokhskoye field in the Sea of ​​Okhotsk in September 1998, 16 km from the coast, the depth of the sea at the installation site is 30 m. Until the autumn of 2008, it was the main object of production - mining complex "Vityaz". Molikpak is an upgraded ice-class drilling platform. The name “Molikpak” means “big wave” in the language of the Eskimos of northern Canada , where this platform was based earlier (in the Beaufort Sea). In 1998, a 15-meter intermediate steel base was added to the base of the Molikpak platform to install it in deeper waters off Sakhalin Island .

Molikpak consists of a caisson , the center of which is filled with sand, ensuring the effective anchorage of the platform on the seabed. The main working areas are closed, they provide temperature control and ventilation. Equipment located in the open air is equipped with means of protection against icing and low temperatures. Residential premises are designed for 132 permanent and 32 seasonal workers. On the Molikpak platform, a drilling method was used with an extended radius of coverage of deviated wells with a maximum horizontal deviation of up to 6 km and a maximum depth of wells up to 6650 m.

• Basis: 111 mx 111 m
• Weight: 54 thousand tons
• Rig height: 101 m
• Top structures: 73 mx 73 m
• Helicopter deck height: 49 m
• Drilling windows: 32 drilling windows
• Operational wells: 13 oil producing wells, one gas injection well, four water injection wells, and one well for drilling mud injection.

The capacity of the Molikpak platform is 90,000 barrels (14.3 thousand m³) of oil and 2.1 million m³ of associated gas per day. Earlier, the platform worked only in the summer months, year-round mining from Molikpak began in 2008 .

As of the end of 2016, the well stock of the Molikpak platform consisted of 15 oil producing, five water injection wells and one absorbing well for re-injection of drilling waste into the formation. The average daily production on the platform in 2016 amounted to 6.72 thousand tons (49.49 thousand barrels) of oil and 0.83 million m ^{3 of} associated gas.

In 2016, the company continued production drilling in order to maintain production levels. Two new wells were drilled:

• in May 2016 (for the first time since 2005), an oil well in the joint part of the field with the completion of the Frac & Pack technology to prevent sand flow;
• a pilot well was drilled in the second well with coring to eliminate the existing uncertainties in geology and field development. After that, the wellbore was drilled and completed in the well to assess the productivity and productivity of unexplored formations.

During the year, several downhole operations were carried out to restore tightness, maintain production levels, as well as conduct mandatory operational monitoring of well operation and water flooding.

In addition to drilling and related operations, the company continued to monitor the development of the field and the operation of wells, the quality of the injected fluid to maintain reservoir pressure (RPM), and the operation of the drilling sludge injection system. In addition, an analysis of geochemical markers was carried out, and the composition of samples of produced oil and water was assessed. On the platform, continuous sand control and well integrity are monitored.

During the year, a number of significant projects for the modernization of the drilling rig were implemented (installation of a new line of jamming and throttling and a new coil of drilling wire). A drill inspection was carried out (held every five years).

In July 2017, it was 18 years since the start of oil production from the Molikpak platform.

As of the end of 2017, the well stock of the Molikpak platform included 16 oil production, six water injection wells and one absorption well for re-injection of drilling waste into the reservoir.

The average daily production on the platform in 2017 amounted to 6.91 thousand tons (50.87 thousand barrels) of oil and 0.82 million m3 of associated gas. Since the start of field development, more than 35 million tons (more than 260 million barrels) of oil have been produced on the PA-A platform.

In 2017, the company continued production drilling in order to maintain a constant level of production.

In February 2017, an oil well was drilled to the central part of the site, using a gravel-packed filter.

In May 2017, the lateral wellbore was drilled with completion according to the hydraulic fracturing and gravel packing technology (GRPGR) to prevent sand flow. Prior to this (2016), the well was stopped due to low reservoir pressure and casing leakage.

Along with these works in June 2017, a water-injection well was drilled in the central part of the reservoir in order to maintain reservoir pressure. In addition to drilling and related operations, the company continued to monitor the development of the field and the operation of wells, the quality of the injected fluid to maintain reservoir pressure (RPM) and the operation of the injection system for drill cuttings. The platform is continuously monitored for the water content of production wells and the process of sand removal, as well as monitoring the integrity of the wells.

In the third and fourth quarters of 2017, a significant number of projects for the modernization of the drilling rig were implemented (replacement of the air defense control unit, replacement of the cement plant and air compressor). In November 2017, seven conductors were installed. In 2017, an Addendum was prepared for a technical project for the construction and operation of underground facilities not related to mining, in order to accommodate drilling waste and other fluids in the Astokhsky area of ​​the Piltun-Astokhsky oil and gas condensate field. In 2017, a quick reassessment of hydrocarbon reserves and an addendum to the technological scheme for the development of the Astokhsky area of ​​the Piltun-Astokhsky oil and gas condensate field were carried out. Materials at the end of 2017 were sent for consideration to the FBU "GKZ" Rosnedra.

In July 2018, 19 years have passed since the start of oil production from the Molikpak platform.

The first nine years, since 1999, mining was carried out only in the ice-free period. In 2008, year-round hydrocarbon production began.

As of the end of 2018, the well stock of the Molikpak platform included 16 oil producing, seven water injection wells and one absorbing well for re-injection of drilling waste into the reservoir. The average daily production on the platform in 2018 amounted to 6.50 thousand tons (47.88 thousand barrels) of oil and 0.78 million m³ of associated gas.

Since the start of field development, the PA-A platform has produced more than 38 million tons (over 281 million barrels) of oil.

In 2018, in the Astokhskoye area of ​​the Piltun-Astokhskoye field, in order to increase the effectiveness of the reservoir pressure maintenance system (RPM), the sidetrack was drilled in a water injection well and an additional water injection well was drilled.

In 2018, the company continued to transfer wells to the gas-lift method of operation * to increase the level of oil recovery, build and commission new wells, monitor the development of the field, ensure reliable operation of the well stock, the quality of injection fluid for RPM and the operation of the injection sludge injection system. (* After cessation of gushing due to lack of reservoir energy, they switch to a mechanized method of well operation, at which additional energy is introduced from outside (from the surface). One of them is the gas-lift method. Gas-lift is a system consisting of a production (casing) column and lowered into it tubing, in which the rise of fluid is carried out using compressed gas (air)).

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• Molikpak platform on the Sakhalin Energy website
• About the Sakhalin-2 project on the Gazprom website
• During the 2007 season, 12.4 million barrels of oil (Sakhalin) were produced from the Molikpak platform (Unidentified) . Regnum News Agency (December 5, 2007). The date of circulation is December 10, 2009. Archived April 12, 2012.
• Molikpak platform on YouTube
• Interactive Sustainability Report 2016
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