SU1716102A1 - Method for gathering underwater spring production and relevant device - Google Patents

Abstract

The invention relates to the technique of operating offshore oil fields, which are inherent in the oil and gas industry in the form of griffins. The purpose of the invention is to increase efficiency by making it possible to prevent environmental pollution. The method consists in withdrawing oil and gas from the griffin through multi-hole perforated casing 3 and operational 6 columns of pipes. Before withdrawing oil and gas from the gryphon, oil with a small gas factor is diverted by a borehole pump 31 from a lateral outlet 28, with which the upper part of casing 3 is pre-equipped. Oil with a large gas factor is raised by a compressor elevator along the production column 6 to a flare, and fluid in the casing 3 support in accordance with the ratio of. where H is the height of the oil level, m; Hi is the depth of 1 &

Description

The invention relates to the oil industry, in particular, to the technique of operating offshore oil fields, which are inherent in oil and gas in the form of griffins.

A known method of operating a well is that three lifting pipe columns are lowered into the casing string, and two columns are concentrically lowered one another.

However, this column is not intended for the exploitation of layers in the sea, from which gas and oil are emitted into the sea.

Closest to the present invention is a device in which there are multi-punctured perforated casing and production tubing strings, tubing strings and a sealing downhole apparatus.

However, this device is also not adapted for marine applications for collecting products from an oil and gas griffon.

The purpose of the invention is to increase efficiency by making it possible to prevent environmental pollution.

The goal is achieved by removing oil and gas on the sea shelf through multi-perforated casing and production tubing, forwarding oil and gas from the griffin drilling the well into the griffin, oil with a small gas factor diverting the well pump from the lateral outlet, which is pre-equipped with the upper part of the casing, oil with a large gas factor is lifted by a compressor lift through the production string to the flare, and

the fluid level in the casing support in accordance with the ratio

.

where H is the height of the oil level, m;

 W - the depth of the lateral outlet of the casing, m;

H - the height of the liquid column water lift, m

The device for collecting products from the underwater griffin is equipped with an operating platform with pumping units placed on it, hydraulically communicated with the production string, a compressor string, mounted in the upper part of the production string, a flare nozzle and a collection system for the underwater griffin, where the compression string is arranged parallel production pipe string.

The drawing shows a diagram of the proposed device, as well as sections of the sea and seabed.

In the reservoir 1, a shortened casing pipe 2 is installed, which is perforated. The perforated casing 3 is lowered into it, protruding above the sea and isolated outside the bottom of the packers 4 along the height of the productive formation 1. The casing 3 is welded to the stop 5, which sits at the end of the casing 2. Inside the casing 3, the production casing 6 is lowered flare pipe, the stop 7 and the compressor column 8, attached to the bottom of the production string 6 and located parallel to the latter, where the valve 9 is also installed.

The compressor string 8 ends with a tap 10. The liquid level with gas inside the production string 6 is shown at position 11, and the flame of the flame is indicated at position 12. In support 7 there is an opening 13, which is closed by a stopper. The marine vehicle (boat 14) is equipped with a compressor 15 (shown by a dot-dash line). The sea is indicated by position 16. The height of the projection of the casing 2 above sea level is determined from the condition of the bending strength of the casing 3 from the wave loading of the sea. To the top of the production string 6 is brought pipe 17, through the valve 18 is connected with a collecting tank 19. The latter is installed on a pyramidal pedestal 20; From the side, a drain 21 is provided with a valve 22 for draining clean water into the sea and a drain 23 with a valve 24 for periodically pouring oil into the vessel 25. The bottom of the sea is shown at position 26. The operating platform is shown at position 27. To the casing 3 is a connecting pipe 28 connected with pumping unit 29, which pumps oil to an assembly point (not shown). Pipeline 28 is connected to casing 3 at a level slightly lower than H from the surface of sea 16 at level h to reservoir 1 (). In the case of a large value of H, it is provided to descend the marine base of the column 30 (indicated by dotted lines) to the seabed with its flexible tube connected to the tube 28 and to operate a downhole pump unit 31 with a well pump.

The device works as follows.

The production of the griffin through the perforated holes of the casing 2 and 3 enters the inside of the casing 3, raising the level of fluid in it to the value H, which can rise to sea level. After the pumping unit 29 or the pumping unit 31 is turned on, the product accumulated in casing 3 begins to flow into the collection point on the operating platform 27, and the gas leaves the pipe and burns, due to which the griffin stops releasing oil and gas in sea.

To call for the flow of oil and gas in the production string, the boat 14 and its compressor 15 are connected to the compressor string 8, open the valve 10 and supply compressed air to the bottom of the production string 6. The weight of the liquid column inside the column 6 is reduced by mixing the liquid with the gas inside it and the level 11 rises. The level in the annulus decreases due to the fact that the gas from the reservoir 1 begins to enter the production string 6 and evolve into the atmosphere. Gas is set on fire

(torch 12), close the valve 10, disconnect the compressor, and the boat 14 leaves. When the gas supply is stopped, it is necessary to re-introduce compressed air into the compressor column 8.

With the open valve 18, the products (water and oil) enter the tank 19, from where the first portion after sludge can be drained through tap 21 directly into the sea 16, and the second into the ship 25.

Examples It is common to all the examples that before the oil and gas are withdrawn from the gryphon, they are driven into the griffin, into the seabed with a pile of short casing or even drilled in a well.

From a gryphon containing oil with a small gas factor and located far from the production platform, the latter is diverted by a well in a pipeline located on the seabed from a lateral outlet of the casing located above the short casing. The fluid level in the casing is maintained according to the ratio

H Hi Ns,

where H is the height of the oil level in the casing relative to the surface of the sea, m.

Hi is the depth of the lateral outlet of the casing, m;

H2 - the height of the liquid column of water lift, m.

A small amount of oil with a large gas factor is lifted by a compressor elevator through an internal production string to a flare, and compressor tubes are connected to a compressor located on the boat to start the elevator. Products griffin burned in the torch.

When the production of a griffin contains a lot of oil and gas; Connect the production pipe above sea level with a collection tank on a pyramidal pedestal, from which oil is periodically drained into the vessel and the remaining water into the sea.

Claims (2)

Claim 1. Method for collecting underwater griffin products, containing offshore oil and gas through sealed multi-hole perforated casing and production tubing, characterized in that, in order to increase efficiency by ensuring that it is possible to prevent pollution of the environment and gas from the gryphon is drilled into the gryphon, oil with a small gas factor is diverted by a borehole pump from the lateral outlet with which the upper part is pre-equipped the casing, oil with a large gas factor is raised by a compressor lift through the production string to the flare, and the fluid level in the casing is maintained in accordance with the ratio where H is the height of the oil level, m; Hi is the depth of the lateral outlet of the casing, m; At - the height of the liquid column water lift, m 2. Device for collecting production of underwater griffin, containing placed in a perforated casing 0 pipes, a production string of pipes with a paver over the perforated zone, characterized in that, in order to increase efficiency by providing the possibility of preventing pollution of the environment, it is equipped with a production platform with pumping units placed on it, hydraulically communicated with the production string, a column of pipes installed in the upper part of the production column of pipes, a flare nozzle and a system for collecting products of the underwater griffin, The pipes are placed parallel to the production string.