Device for cleaning and completion

 

The invention relates to the oil industry and can be used for cleaning the bottom-hole zone and the bottom of a well from cuttings, sand, wax, tar and other hard-to-wash deposits, as well as in the secondary drilling formations in depression mode. Provides high performance and reliability, increases the cleaning efficiency of the well and extends the functionality. The inventive device includes a housing and mounted inside the hollow shaft with radial channels, spring-loaded check valve, packer and seal. A housing coupled to the reference pipe with through holes. Spring-loaded check valve overlaps the Central channel. According to the invention the hollow rod is provided in the upper part of the annular internal ledge. This protrusion is located between the rows of radial channels and cylindrical sockets at the bottom. In these nests installed bulbs-clamps. Balls-clips are from the outside in spherical annular sample of housing and cooperating with the inner side with a dull locking sleeve. This sleeve is connected with the rod shear elements. Hollow stem provided with t odbijenou spring-loaded sleeve with a cylindrical sample on the inner surface. In the case below the spherical annular sampling performed annular internal ledge and radial channels. These radial channels in the initial position blocked by a spring-loaded sleeve. Radial channels located in the lower part of the body, in the initial position overlapped with the supporting pipe. The support pipe connected to the housing of the cutting elements. The casing in the lower part equipped with the cutting cone to interact with hollow plugs installed in the casing string. 1 C.p. f-crystals, 1 Il.

The invention relates to the oil industry and can be used for cleaning the bottom-hole zone and the bottom of a well from cuttings, sand, wax, tar and other hard-to-wash deposits, as well as in the secondary drilling formations in depression mode.

A device for cleaning a borehole method implosion, consisting of implosion chamber, through which the electronic unit and geophysical headgear is attached to the logging cable. In the upper part of implosion camera hanging groupstage, and at the bottom is a stepped rod connected with the centering sleeve with overlapping Cams put in the transport and device are:

- low efficiency of the device, due to the fact that when you open implosion chamber, the latter will be filled mainly by the downhole fluid, and not cuttings and formation fluids;

- high cost of the device, owing to the use of electronic equipment and wireline;

- limited amount of implosion chamber;

- limited functionality.

The closest in technical essence to the present invention is a device for cleaning a borehole, comprising a housing associated with the supporting pipe with through holes, and mounted inside the hollow shaft with radial channels, spring-loaded check valve, overlapping the Central channel, the packer and seal (2).

Significant disadvantages of the device are:

- insufficient rigidity;

- the possibility of failure of the lower seal housing for cutting him during the passing of the perforated holes of the stock;

- low efficiency of cleaning wells, due to the fact that the message pedacinho space with the inner space of the tubing (tubing) will happen before they reached the end and the reservoir and the reservoir fluid;

during the descent, in the case of sticking or failure of equipment, possible unauthorized spacerowa and implosive flooding;

- difficulties in the condition when the force of elastic deformation of the compression spring would be more force by the elastic deformation of the sealing element of the packer;

- limited functionality.

Object of the invention is a device having a higher rigidity, higher efficiency and reliability, high efficiency of cleaning wells, enhanced functionality and providing significant savings of material resources.

This problem is solved by the proposed device, comprising a housing associated with the supporting pipe with through holes, and mounted inside the hollow shaft with radial channels, spring-loaded check valve, overlapping the Central channel, the packer and seal.

What's new is that the hollow rod is provided in the upper part of the annular internal ledge located between the rows of radial channels and cylindrical sockets in the lower part with installed ball-clamps included with the outer article is the second bushing, connected with the rod cutting element; equipped with a grid below the cylindrical sockets; radial canals rod covered in the initial position of the movable spring-loaded sleeve with a cylindrical sample on the inner surface; in the case below the spherical annular completed sampling annular internal ledge and radial channels in the initial position overlapped with the spring-loaded sleeve; a radial channels located in the lower part of the body, in the initial position overlapped with the supporting pipe, coupled with the body of a cutting element; a housing in the lower part equipped with the cutting cone to interact with hollow plugs installed in the casing string.

New is also that the outer surface of the lower part of the hollow retainer sleeve is made conical.

The drawing shows a longitudinal section of the proposed device.

It consists of a rod 1, in the upper part of which has an annular internal ledge 2, above and below which are the top 3 and bottom 4 rows of radial channels. In the lower part of the stem 1 has a cylindrical socket 5, which has a balls-clamps 6, the incoming outer surface in spherical kolicevo rod shear elements 10. On the lower end of the rod is rigidly installed grid 11.

On the outside of the stem in the area of radial channels is set sleeve 12 with a cylindrical sample 13 from the inside. One end of the sleeve abuts against the spring 14, and she, in turn, annular protrusion 15, and the other in the expansion cone 16 of the packer, which is connected with the rod 1 shear elements 17. Expanding cone 16 is in contact with elastic cuff 18 of the packer, and it is with the body 8. The last executed step and provided with a lower spherical sample 7 of the inner annular projection 19 and the radial channels 20, covered by a sleeve 21, with through channels 22, between which and the ledge 23 is set to the spring 24. On the ledge 23 is spring-loaded check valve 25, overlying the Central channel.

At the lower end of the case is made of radial channels 26, is covered by a support pipe 27 with through holes 28, integral with the shell shear elements 29. The body is equipped with the cutting cone 30 that is installed slightly above the support pipe 27. The mating surfaces of the devices are supplied with seals 31.

The length of the housing 8 and the support pipe 27 is taken from the calculation, so that when installing the device in the bore hole of the support pipe 27 were below the filter 32 defined therein hollow plugs 33, filled with visco-plastic substance 34 (for example, paraffin, tar, and so on), was opposite the productive formation. The cement produced by the conventional methods.

After setting of the cement slurry Stripping, cleaning and development of the productive formation is as follows.

The device is assembled on the tubing lowered into the well on the way to the bottom, while the funnel 30 cuts off the head of hollow plugs 33, dissolved shear elements 29, shift the supporting tube 27 relative to the housing and the opening of the radial channels 26. Due to the pressure difference between the inside and the annular space of the locking sleeve 9 is moved upwards to the ledge 2, destroying the cutting elements 10 and releasing the balls-clips 6.

Under the weight of the casing the shaft 1 starts to move down, pulling expanding cone 16, which extends elastic cuff 18 of the packer and tightly presses her to the casing walls. The cutting elements 17 are destroyed. When the movement of the rod 1 down radial channels 3 are cylindrical sample of 13, after which the message annulus below the packer with the space inside the tubing, which is under atmospheric pressure.

The depression on the layer can be adjusted by adding the calculated volume of fluid in the tubing.

After conducting clean-up operations and development of one layer of the device on the tubing to rise up to the surface, namely the stem 1, the spring 14, the sleeve 9, the balls 6, the grid 11 and the sleeve 12. The latter is returned to its original position, i.e., covers the upper row of radial channels 3 and prevents flow in the borehole fluid and cuttings from the tubing. Another part of the device, including packer (16, 18), the housing 8 with the cutting cone 30, a check valve 25, the support pipe 27 and the spring-loaded sleeve 21, remain in the well. In the process of lifting the tubing in the well add W is

If necessary, processing of the productive formation through what time after the beginning of operation, submersible pump lifted, lowered into the well tubing with radial holes on the end, press on the sleeve 21, this opens up the channels 20 and through them into the reservoir pumped fluid and the reagents necessary for the formation treatment. After completion tubing raise, under the action of the spring 24 and the sleeve 21 overlaps the channels 20, the lower pump, and the well is again ready for operation.

Technical and economic efficiency of the device and results in a higher rigidity and a higher reliability and availability of its components. Ensured preservation of reservoir properties of productive formation from the adverse effects of borehole fluid and impurities present in the wellbore when the lifting device to the surface during the descent and ascent of pumps, etc. Achieves reliable and efficient cleaning of the productive formation of sludge and dirt that allows you to eliminate their negative impact on the operation of the reservoir.

The device has enhanced functionality, because it poses the UIC equipment. In addition, it is necessary to perform processing of the productive formation to increase its oil production, while the device itself from the well does not rise. These factors will allow you to save a considerable amount of time and material resources.

Sources of information

1. Analogue. RF patent №2086753, MKI 6 E 21 In 37/00, 1997.

2. The prototype. RF patent №2068079, MKI 6 E 21 In 37/00, 1996.

Claims

1. Device for cleaning and reclaiming wells, comprising a housing associated with the supporting pipe with through holes, and mounted inside the hollow shaft with radial channels, spring-loaded check valve, overlapping the Central channel, the packer and seal, wherein the hollow rod is provided in the upper part of the annular internal ledge located between the rows of radial channels and cylindrical sockets in the lower part with installed ball-retainers, incoming from the outside in spherical annular sample of housing and communicating with the inner side with a dull locking sleeve, which is connected to a rod shear elements; equipped with mesh below the cylindrical sockets; radical on the inner surface; in the case below the spherical annular sampling performed annular internal ledge and radial channels in the initial position overlapped with the spring-loaded sleeve: radial channels located in the lower part of the body, in the initial position overlapped with the supporting pipe connected to the casing shear elements; a housing in the lower part equipped with the cutting cone to interact with hollow plugs installed in the casing string.

2. The device under item 1, characterized in that the outer surface of the lower part of the hollow retainer sleeve is made conical.

 

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FIELD: oil extractive industry.

SUBSTANCE: device has pit-face cutting valve and mounting tool. Cutting valve has body, packer with check valve and perforated tail. Mounting tool has hollow rod, connected by shear elements to expanding cone of packer, lower and upper bodies. Lower body is provided with self-compacting collar, and upper - through tubing string of limited volume and sleeve is connected to drop valve cylinder. Valve rod is connected to rope, on which device is lowered into well. Hollow rod and tubing string form depression chamber being at constant atmospheric pressure. Rod has upper and lower shelves. On shelf of upper body expander of self-compacting collar having longitudinal grooves is mounted. After raising of mounting tool from well packer, body with tail and check valve remain in it. Then a pump is lowered into well.

EFFECT: lower costs.

3 dwg

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