The way washout of sludge deposits for their subsequent removal from pressurized tanks of oil through a flexible pipe unit "coiled tubing"

 

The invention relates to the field of oil for transportation, in particular to the separation for removal of gas and mechanical impurities. Enables the creation of technology for washing and removing sludge deposits from the tanks of oil. The inventive method is to scour sediments flexible pipe unit “Coiled tubing”. This pipe is equipped with a perforated section, hermetically United with razmyvochny head, which is the working end of the flexible pipe. The working end of the flexible tube is introduced into a sealed reservoir oil treatment on a given path. The pressure of the drilling fluid at the working end of the pipe is set to 0.8-1.0 MPa. Move it inside the tank at a rate not exceeding 1 m/min when the traction force on the working end pipe 2-3 kg/cm2. During the entire cycle of washing and removing sediments consumption of washing liquid supplied to the tank support is based 8-10 m31 m3sludge deposits. 2 C.p. f-crystals, 4 Il.

The invention relates to technologies of oil, including, in particular, its separation for removal of gas and advocate for the Department of mechanical included the e tanks, equipped with pipelines for the transportation of prepared oil and remove settled sludge deposits.

There is a technical problem of the maintenance of such tanks, which consists in the necessity of periodic cleaning of the hull of the tank from sludge deposits, which contain asphaltenes, resinous substances, waxes, solid mechanical impurities, etc.

During operation of the tank sludge deposits turn into a layered structure, in which solid deposits are at the bottom and are pressed, because in addition to sand and corrosion products they contact clayey sediments and are cemented.

The accumulation of solid deposits in the lower part of the tank is changing the dynamics of the operation of the reservoir, the hammering process piping asphalt-sandy sediments and the need for stopping the operation of the tank for repairs.

Today the cleaning tank from sludge deposits is the most dangerous and costly when renovations equipment technological platforms oil treatment for the following reasons.

First, the existing production technology tries its depressurization.

Depressurization of the reservoir leads to environmental degradation, pollution, Bob tank, the reduction of the explosive object.

Even the use of the robot would not solve the problem, because his movement inside the tank would be limited due to the presence of technological pipelines and would also require periodic presence of personnel inside.

The essence of this proposal is to use for the above-mentioned problems of the progressive coiled tubing technology, which is based on the movement of long flexible collar without coupling pipe spooled on the drum, mounted on a truck chassis or trailer.

This technology over the past 30 years is widely used in the world practice of oil during operation and workover, as well as in the construction trades, because it has high economic efficiency and significant technological advantages.

Currently, the flexible pipe is used, including cementing, stimulation, logging, testing, wells etc., (proceedings of the II all-Russian scientific-technical conference on Koltun and cleaning of bottom-hole zones of injection wells from paraffin and oil residue (A. N. Khamidullin. Operation of coiled tubing units, the results obtained and mastered technologies at JSC “TATNEFT”, /1/, S. 20-23).

“The technology of treatment of bottom-hole zones of injection wells by creating a depression and simultaneous chemical effects on the reservoir through a flexible pipe” /1/, page 22-23, its purpose cleaning with the use of coiled tubing can be taken as the closest analogue to the claimed solution.

When creating coiled tubing technology for washing and removing sludge deposits from tanks, oil treatment, it was necessary to determine the parameters of the cleaning process, taking into account the peculiarities and conditions of this process.

The conditions include the exclusion of damage to the inside of the tank and anti-corrosion coatings and the need to maintain a certain concentration of sludge sediments in water in the form of a pulp to remove technological pipelines in compliance with the requirements for security of a closed tank with oil.

The present invention is the creation of coiled tubing technology for erosion and subsequent removal of sludge deposits from tight reservoirs of oil.

2, during the entire cycle of washing and removing sediments consumption of washing liquid supplied to the tank support is based 8-10 m per 1 m3sludge deposits.

However, additional holes in the perforated pipe section is arranged to flow direction of the jet of washing fluid in the direction opposite to the direction of movement of the working end of the flexible pipe.

Additionally, the inventive method comply with the condition that the total surface of the cross section of the additional holes of the perforated section of pipe is not more than 1.2 times the cross-section of the pipe.

The invention consists in the following. The use of the flexible pipe to move the second surface sludge deposits and provides a seal failure of the tank and the presence of the working personnel “to loosen” - blur sludge deposits in all their volume using supplied under pressure into the body of the reservoir drilling fluid.

A necessary condition for the solution on the erosion and subsequent removal of sediments is also bringing the mass of sludge in the movement to create a working space for razmyvochny head.

Water acting on the slurry through the holes of the perforated portion of the tube contributes to this. If the holes of the perforated pipe run so that they sent a stream of washing fluid in the direction opposite to the direction of movement of the working end of the flexible pipe, and in such quantity that the total surface of the cross section of the holes which did not exceed more than 1.2 times the cross-section of the pipe, the effect of razmyvochny head will be the greatest.

However, in order not to damage the casing wall of the tank and anti-corrosion coating, pressure washing fluid at the working end of the pipe is set to 0.8-1.0 MPa, and traction on the working end pipe 2-3 kg/cm2. The lower limits of pressure and traction on the working end of the pipe due to the efficiency of the process.

The speed of movement of the working end of the pipe is and the moving speed of more than 1 m/min end of the flexible pipe will choose the path envelope volume of sludge deposits without affecting them.

Erosion of sediments is a necessary condition for the removal of the sludge, but not sufficient, therefore, for the effective promotion of the eroded sediments on technological pipelines consumption of washing liquid supplied to the tank support is based 8-10 m31 m3sludge deposits.

EXAMPLE. The method was tested on the reservoir oil treatment process booster pump station Samotlor oil field. The volume of reseroir 2000 m3the diameter 15184 mm, circumference 47681 mm Overall level of sludge deposits in the tank before the washout was 245 cm in height, which in terms of volume equal to 416, 5 m3.

The method is illustrated by the drawings, where Fig. 1 shows a General diagram of the technology of washing and removing sludge deposits, Fig. 2 - the trajectory of movement of the working end of the flexible tube inside the reservoir oil by settling, in Fig. 3 - same, but for the device separation of oil from gas, Fig. 4 - additional perforated pipe connected with razmyvochny head.

For work tank 1 containing pipes 2 for supplying oil, derived from expidite in the tank is reduced to a height of approximately 0, 5 m above the level of sludge deposits.

For the implementation of erosion used the unit “Coiled tubing” produced feed (Republic of Belarus) with a diameter of flexible tube 38 mm, with a complete set razlivochnyh heads.

Unit 3 “Coiled tubing” was established on the site of oil.

Razmyvochny head 4 equipped with additional plot 5 flexible pipes with a diameter of 38 mm and a length of 22 m, which sealcoat in the outer surface razmyvochny head and hermetically seal with seals 6. Perforation surface area 5 is made in the form of 52 holes 7 in diameter from 2.5 to 6 mm, the holes are angled 15-90increments of 150 mm

The working end of the flexible tube equipped with a perforated section, enter in “sukhotrub” - adoptive protective pipe with a diameter of 100 mm (not shown). Open the intake valve on the hatch-hole 8 and produce a flow of produced water per unit “Coiled tubing”, checking its performance.

Set the operating parameters of the modes of erosion. The pressure of the drilling fluid at the working end of the pipe is set to 0.8-1.0 MPa and control in the cleaning process by means of a counter.

Traction on the working end of the tube set 2-3 kg/tion pipe through the manhole 8 is injected into the internal cavity of the tank 1 with the control parameters of the pressure of drilling fluid and pulling on the working end of the pipe. Is start working pumps.

To control the speed of movement also allows the system control unit “Coiled tubing”.

When the output of the pump on a stable regime continue moving the working end of the flexible pipe on the volume of sludge deposits inside the tank at a rate of 1 m/min.

The optimal trajectory of movement of the working end of the pipe depends on the design of the tank and is determined experimentally. In this example, the path of the flexible pipe shown in Fig. 2 and 3. In Fig. 2 depicts a cross section of the tank 1 for defending oil and in this case, when reaching the working end of the value of promotion, is approximately equal to the circumference of the tank, producing a return of the working end. Then resume the movement on the perimeter of the inner cavity of the tank. Additionally produce erosion of sediments in the Central part of the cavity of the reservoir (Fig. 2). If you deviate from the modes of erosion produced a return of the working end.

When using the method for washing and removing sludge deposits from the body of the device 9 of oil separation (Fig. 3), the axis of which is in contrast to the reservoir (Fig. 2) is located in a horizontal plane, trajectory the process of washing and removing sediments flow of washing fluid, supplied to the tank support is based 8-10 m31 m3sludge deposits. Blurred deposits due to such concentration in the washing liquid through technological pipelines, without clogging their walls, with the help of pumps are removed from the slurry tank in the barn 10.

The cycle of erosion is repeated until there is no pulp sludge deposits.

The results of the proposed method, the total volume of residual sludge was 41 m3. The operation for washing was 16 hours

Thus, when using the inventive method is labour productivity, which is considered high for this type of work. The sludge removal is performed without the presence of personnel, which ensures the safety of the process and the improvement of labor conditions.

Thanks Chisinau execution unit “coil tubing technology is mobile and can be used on many platforms oil treatment. The ability to manage technological regimes cleaning process is also provided by the system management apparatus, therefore, requires no additional cost.

Given the fact that the devices “Coiled tubing” are available or required for use in the processes to be justified, and from these positions.

Claims

1. The way washout of sludge deposits for their subsequent removal from pressurized tanks of oil through a flexible pipe unit “Coiled tubing”, including the introduction of the working end of the flexible pipe in the form of razmyvochny heads in the treatment area, filing it under the pressure of the drilling fluid, moving razmyvochny head on the treatment area in a predetermined path, characterized in that the working end of the flexible tube equipped with additional perforated portion of the tube is hermetically connected to razmyvochny head, the working end of the flexible tube is introduced into a sealed reservoir of oil, the pressure of the drilling fluid at the working end of the pipe is set to 0.8-1.0 MPa, move it inside the tank at a rate not exceeding 1 m/min when the traction force on the working end pipe 2-3 kg/cm2, during the entire cycle of washing and removing sediments consumption of washing liquid supplied to the tank support is based 8-10 m31 m3sludge deposits.

2. The method according to p. 1, characterized in that the working end of the flexible tube equipped with additional perforated section of the pipe, the holes which are made with the possibility of extending the pipe.

3. The method according to p. 1, characterized in that the working end of the flexible tube equipped with additional perforated section of the pipe, the total surface of the cross section of the holes of which does not exceed by more than 1.2 times the cross section of the flexible pipe.

 

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SUBSTANCE: device includes rail road with individual waste water receivers formed into track, assembly for supplying tank flushing hot water and steam having no pumps, assembly for waste water receiving and purification, system for oil slime and remaining oil collection and recycling. Flushing assembly comprises means for high-frequency treatment of tank chamber walls. The means is formed as portable vibrator to be installed on tank shell during flushing thereof. Assembly for flushing water and steam supplying includes two high-pressure vessels providing water discharge by the action of superheated steam. The vessels are provided with distribution manifold, which provides change of operating mode from high-pressure mode, in which the vessels are used for water discharge to lower-pressure one, in which the vessels are used for waste water receiving, due to connecting manifold valve system with steam supplying system.

EFFECT: reduced time of tank cleaning from viscous oil, reduced power inputs for oil heating and increased simplicity of water recycling system.

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