Method of subsurface disposal of drill fluids in permafrost rocks

FIELD: transport.

SUBSTANCE: proposed method comprises pumping waste drill fluids from drilling rig to subsurface reservoir 1, forcing them through well 2 into said reservoir and changing them into frozen state. For this, free space 7 is provided in reservoir top section making at least 9% of the volume of fluid contained in drill wastes. In-season refrigerating device 3 is lowered through the well onto the reservoir bottom into drill wastes sediments. Drill wastes are frozen at the temperature lower than that of permafrost rocks in direction from reservoir vertical axis to its side surface.

EFFECT: higher efficiency of disposal.

1 dwg

 

The invention relates to mining and can be used in the operation of underground storage tanks, created in permafrost through the well for disposal of drilling wastes.

There is a method of disposal of drilling waste, including removing from the total waste volume of the liquid phase and the subsequent pumping it into deep absorbing horizons, and disposal of solid drilling waste carried out at the site (Varens, Wearking, Aschalew, Gkhan. Use of downhole application of hydraulic technology in the development of hydrocarbon deposits in the North. Herald of the Russian Academy of natural Sciences, 2008, volume 8, No. 1, pp.33-38).

The disadvantage of this method lies in the negative environmental impact on nature. The disposal of liquid drilling waste in absorbing horizons does not preclude their further migration, and because of the potential for flooding of the landfill flood waters is not excluded from entering the waste in natural water bodies.

In the North it is better to use the method of disposal of drilling waste in tanks, built in permafrost (Varens, Wearking, Aschalew, Gkhan. Use of downhole application of hydraulic technology in the development of hydrocarbon deposits in the North. Herald of the Russian Academy of natural Sciences, 2008, volume 8, No. 1, pp.33-38).

The most is e close to the claimed technical solution is the method of disposal of drilling waste in an underground reservoir, created in permafrost through hole (A.S. USSR №1620391, B65G 5/00). The method includes transporting the waste drilling mud containing drill cuttings from the drilling rig to the underground reservoir, the injection of waste drilling mud through the borehole in the underground tank, the settling of waste drilling mud in an underground reservoir, pumping clarified part of the drilling fluid to the surface for reuse, the transfer of remaining in an underground reservoir is part of the drilling fluid with cuttings in tvercommertsia state due to the natural cooling capacity of the underground reservoir permafrost and re-injection of waste drilling mud into the underground tank.

The disadvantage of this method is low efficiency associated with the duration of the translation process of drilling waste in tvercommertsia state due to the influx of cold from the surrounding underground tank permafrost.

The objective of the invention is to improve the efficiency of the process of disposal of drilling wastes shortcomings.

The technical result of this task is:

- to achieve a lower temperature, ensuring the freezing of drilling waste in the Central and lower parts of the underground reserve the RA;

- increased stability of the underground reservoir by removing from its Central part to the peripheral area of unfrozen mud;

- prevent a possible failure of the cap rocks in the result of an increase in volume upon freezing of the liquid component of the drilling waste.

To achieve this result in the way of underground disposal of drilling waste in permafrost, including the transportation of waste drilling waste from the rig to the underground reservoir, injected through a well into an underground reservoir and translation in tvercommertsia state, according to the invention when placing drilling waste in underground tanks at the top create a free space of not less than 9% relative to the volume of liquid contained in the drilling waste down through the well to the bottom of the underground tank to the sediment drilling waste seasonal cooling unit, and the transfer of drilling waste in tvercommertsia condition is carried out at a temperature below the temperature of the containing permafrost in the direction from seasonal cooling device located in the region of the vertical axis of the underground tank to its lateral surfaces

The creation of an underground reservoir space of not less than 9% of the volume of the liquid containing the action scene in drilling waste prevents the destruction of cap rocks in the result of an increase in volume upon freezing of the liquid component of the drilling waste, since the density of water is 9% less than the density of the formed ice.

Translation of drilling waste in tvercommertsia state at a temperature below the temperature of permafrost host rocks, which allows you to freeze liquid drilling wastes containing dissolved salts that are added to drilling fluids to reduce the temperature of freezing.

Translation of drilling waste in tvercommertsia state in the direction from the axis of the underground reservoir to its lateral walls faster to freeze the contents of the Central part, in which, under normal freezing techniques, creates a zone with a higher content of dissolved salts, which is characterized by a lower freezing point. In addition, the development process of the collapse of an underground reservoir likely in its Central part, so most complete freezing of drilling waste in this area increases the stability of an underground reservoir.

The descent through the well to the bottom of the underground tank of seasonal cooling devices and submerging it in the sediment drilling waste provides freezing in the first place precipitate solid drilling waste, thermal conductivity of which is higher than thermal conductivity of liquid ochodovat this increases the surface through which flows cold in the underground tank, and the freezing of liquid waste occurs not only from the vertical axis of an underground reservoir, but also on its lower part, as in the known method (prototype) freezing occurs mainly in the upper part of an underground reservoir by natural cooling in the winter.

The proposed method for underground disposal of drilling waste in permafrost is illustrated by a drawing.

In the underground reservoir 1, created in permafrost through the borehole 2, place the drilling waste and lower seasonal cooling unit 3, immerse him in the besieged cuttings 4 to the bottom of the underground tank 1. Over the besieged drill cuttings 4 is formed a layer of liquid drilling waste 5, in which the frozen sections of drilling waste 6. When placing drilling waste in an underground reservoir 1 in the upper part of the cavity has a free space 7.

Way underground disposal of drilling waste in permafrost is as follows.

Drilling wastes, including drilling cuttings 4 and liquid drilling waste 5 generated during drilling operations, is transported from the drilling rig (not shown) to the place of burial of waste and place them through the hole 2 in an underground reservoir 1. When it is filling, drilling waste in the upper part of the cavity underground reservoir 1 create space 7 of not less than 9% of the volume of the liquid contained in placed of drilling waste. Cuttings 4 is deposited on the bottom of the underground tank 1, and liquid drilling waste 5 placed over the drill cuttings 4. After filling underground tank 1 into the borehole 2 lower seasonal cooling device 3 with immersion in cuttings 4 to the bottom of the underground tank 1. In the cold period of the year for seasonal cooling device 3 is transferred to the cold from the surface into the underground tank 1, the temperature seasonal cooling unit 3 is determined by the ambient temperature and is significantly below the temperature capacity of the underground reservoir 1 rocks. The heat exchange between the seasonal cooling unit 3 and drilling waste leads to transition them into tvercommertsia state with formation of frozen sections 6 along the axis of the underground tank 1 around the seasonal cooling unit 3. In tvercommertsia state faster just goes cuttings 4, because its thermal conductivity is higher than liquid drilling waste 5. In the future, there is a transition of liquid drilling waste 5 in tvercommertsia state in the direction from the axis of the seasonal cooling unit 3 and the frozen cuttings 4 to the walls of the underground reservoir 1. The formation of frozen sections 6 at the walls underground tank 1 is also due to cold supply in a VM is to prohibit permafrost. Seasonal cooling device 3 operates only when the difference is negative temperatures on the surface and in the underground tank 1 around the seasonal cooling unit, so the cooling of drilling waste in the Central part of an underground reservoir 1 will occur at temperatures mostly below temperatures containing permafrost.

During freezing of drilling waste in an underground reservoir 1 volume increases by an amount in excess of 9% of the volume of liquid contained in the drilling waste and, thus, will fill the entire volume of the underground reservoir 1, including the cavity 7, without affecting covering underground tank 1 permafrost.

A specific example of implementation of the proposed method is disposal of drill cuttings during the drilling of gas wells in the gas fields of the Yamal Peninsula. Drilling wastes consisting of drill cuttings volume of 1650 m3and liquid drilling waste volume of 3000 m3transported to the place of their burial and placed in an underground reservoir with a volume of 5000 m3. The volume of the liquid phase of drilling waste, taking into account the fluid contained in the pore space of drill cuttings (40%), is 3660 m3. The volume of the unfilled portion 7 underground reservoir 1 is equal to 350 m3that is 9.6% of summary the volume of liquid, contained in the drilling waste. Thus, the freezing of drilling waste filled almost all of the useful volume of the underground tank in which the total amount of frozen drilling waste will be 4979,4 m3. The temperature on the surface in winter reaches minus 40°C - 50°C, which provides cooling of the outdoor heat exchanger (condenser) cooling unit and the temperature decrease around his underground parts (evaporator) to minus 35°C to -45°C, which is sufficient for translation in tvercommertsia status of drilling wastes containing additives for lowering the freezing temperature. The duration of the cold season for the Yamal Peninsula is 9 months.

Thus, the totality of these symptoms provides a solution to the problem of increasing the efficiency of underground disposal of drilling waste in an underground reservoir, created in permafrost sediments.

Way underground disposal of drilling waste in permafrost, including the transportation of waste drilling waste from the rig to the underground reservoir, injected through a well into an underground reservoir and translation in tvercommertsia state, wherein upon placement of drilling waste in underground tanks at the top create a free PR is a space of not less than 9% relative to the volume of the liquid contained in drilling waste down through the well to the bottom of the underground tank to the sediment drilling waste seasonal cooling unit and the transfer of drilling waste in tvercommertsia condition is carried out at a temperature below containing permafrost in the direction from the vertical axis of the underground tank to its side surfaces.



 

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