Device for cleaning bed and maintaining bed productiveness

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

 

The invention relates to the oil industry and can be used as equipment for cleaning of bottom-hole zone of the reservoir from mud, sand, wax, tar and other hard-to-wash deposits.

A device for cleaning a borehole containing a hollow stem with an annular protrusion and installed whipped valve and a compression spring, a housing with a back-pressure valve connected to the shank and the retainer, and the stem and the shank is made with radial channels, shear and sealing elements (see RF patent №2068079, MKI 6 E 21 In 37/00, 21/00, 1996).

The drawbacks:

- the design complexity and the lack of rigidity;

- low efficiency of cleaning wells, due to the fact that the message pedacinho space with the inner space of the tubing (tubing) will occur sooner than would be achieved final spacerowa well, as a result of this tubing will be filled with borehole fluid, and no pollution of the reservoir and the reservoir fluid;

the device allows to achieve a temporary effect, because after his ascent, together with the packer, the impurities contained in the wellbore, will again enter into the pores and channels of the productive formation and reduce its permeability.

The closest to the technical nature of the offers is proposed is a device for cleaning the bore, containing downhole clipper comprising a housing with a check valve, connected with a perforated shank, and packer, consisting of cuffs and a widening cone, boarding tool, comprising a hollow stem, plugged at the bottom, with the radial channels above the stub that extends the cone and the casing are connected by shear elements, and the lower end of the hollow rod telescopically mounted in an expansion cone (see RF patent №2186947, MKI 7 E 21 In 38/00, 2002).

The use of the known device results in significant operational costs, due to the fact that it lowered into the well on tubing, and this process is laborious and lengthy in time.

The objective of the invention is to provide a device with relatively low operating costs.

This problem is solved by the proposed device containing downhole clipper comprising a housing with a check valve, connected with a perforated liner and packer, consisting of cuffs and a widening cone, boarding tool, comprising a hollow stem, muted bottom with radial channels above the stub that extends the cone and the casing are connected by shear elements, and the lower end of the hollow rod telescopically mounted in an expansion cone.

What's new is that the landing tool is provided with a lower cor the mustache, mounted telescopically on the rod and connected with the expansion cone cutting elements in the outer groove which is on the perimeter of the installed self-sealing cuff with emphasis, supplied also connected with a hollow stem and casing tubing of the limited volume of the upper casing on a ledge which is hardwired expander self-sealing cuff with longitudinal grooves, and a column of tubing by means of the coupling is connected with the cylinder and waste valve, the stem of which is equipped with upper and lower ledges, connected with the cylinder through shear elements.

Figure 1 shows the proposed device in longitudinal section lowered into the well.

Figure 2 is the same in spacerunner condition.

Figure 3 - hole cutter, which remains in the hole after raising the landing tool.

The device consists of two nodes: downhole trimming and planting tool.

Downhole shut-off valve (figure 1) consists of a housing 1 with an internal ledge 2 on which a check valve 3, a perforated shank 4, the packer including a cuff 5 and extending cone 6, which is connected with the housing 1 shear elements 7.

Boarding tool includes a hollow stem 8 with the cap 9 and the radial channels 10. On the hollow shaft 8 are telescopically mounted the lower housing 11, in the outer groove which is perimetro installed self-sealing cuff 12 with the stop 13. The upper end of the hollow rod 8 is connected with the upper case 14, on the ledge 15 which is installed the extender 16 for self-sealing cuff 12 with longitudinal grooves, a preloaded nut 17. The upper case 14 is connected with the column tubing 18, consisting of three or four pipes, which, in turn, through the coupling 19 is connected to the cylinder 20 and waste valve 21, which is installed inside the piston rod 22 with the bottom 23 and top 24 ledges connected to the cylinder shear elements 25.

The device is lowered into the well on a rope 26 which is attached to the rod 22. The mating surfaces of the parts provided with sealing rings 27.

The rod 8 from the tubing 18 form a depression chamber 28 under atmospheric pressure. The length of the shank 4 is taken from the calculation, to the top of the hole was at a distance of 5-10 m from the base of the reservoir, and the lower end of the cuff 5 is at a distance of 5-10 m from the roof of the productive formation.

The device operates as follows.

The device on the rope 26 is lowered into the well on the way to the bottom and unload. The upper part of the landing tool with a hollow piston rod continues to move downward until the moment when the bottom end of the upper shell 14 will sit on the top end stop 13, and the expander 16 will enter a self-sealing cuff 12. Then seal the wellhead and within obsdn the th column 29 create excessive pressure, under the influence of which destroyed the cutting elements 30. Boarding tool goes down, the end face 31 of the lower housing 11 sits on expanding cone 6, then under the influence of the collapse load shear elements 7. Expanding cone 6 moves down, stretches and tightly presses the cuff 5 to the casing walls 29, rasamma thereby downhole space from the reservoir.

Simultaneously with the expansion cone 6 moves down and the hollow piston rod 8, the radial holes 10 which is in the process of spacerace out of the expanding cone (figure 2). At this point is the connection of the internal space of the hollow rod 8 and the tubing 18 with the inner space below the packer. As well as inside the rod and tubing atmospheric pressure on the reservoir creates a significant depression. Under the influence of the pressure difference between the contamination and sludge from the reservoir through the shank 4, the housing 1 and the radial channels 10 fall within the hollow stem 8 and further into the tubing 18.

After cleaning the productive formation produce the tightness of the rope 26, while the cutting elements 25 of the valve 21 are destroyed, the rod 22 is lifted in the cylinder 20, there is a message downhole space with the inner space of the device and the adjustment pressures. Upon further tightening of the rope rises to the upper part of the sedimentary tool thanks to the expander 16 disengages from self-sealing cuff 12, and then boarding the tool is lifted from the well. In the remain well packer, a body with a shank and a check valve (figure 3).

Then in the hole down the pump and produce development and operation in the usual manner.

Due to the fact that the proposed device is lowered into the well on a rope, which eliminates the need to use tubing on the depth of the well, accelerates the process of lowering and lifting device, which, ultimately, will save considerable material resources.

Device for cleaning and maintaining the productivity of the reservoir containing the downhole shut-off valve comprising a casing with a check valve, connected with a perforated liner, packer, consisting of cuffs and a widening cone, the United shear elements with the body, and planting tool, including muted bottom cover hollow shaft with radial channels above the plugs, the lower end telescopically mounted in an expansion cone, a column tubing (tubing) and waste valve, characterized in that the planting tool is provided with a lower housing with an external groove around the perimeter and an upper housing and a ledge, the column tubing has a limited volume, waste valve to perform the Yong in the form of a cylinder, connected through coupling with the column tubing limited volume, and stem with upper and lower ledges associated with the cylinder through shear elements and configured to attach to the rope, while the lower body is installed in the outer groove on the perimeter of the self-sealing cuff with emphasis, telescopically mounted on the hollow shaft and is connected with the expansion cone shear elements, the upper body is connected to the hollow stem and casing tubing limited volume, and on the ledge of the upper casing rigidly mounted with longitudinal grooves expander self-sealing cuffs.



 

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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

FIELD: oil and gas production.

SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

FIELD: oil and gas production and corrosion protection.

SUBSTANCE: composition according to invention, which can be used for asphaltene-tar-paraffin deposits from bottom zone of formation, discharge pipes, oil-collection reservoirs, and oil-field equipment, contains 1-5 vol % nonionic surfactant: oleic acid, С912-alkyl-phenol, С910-alkyl-phenol, or N-alkyl-3-methyl-5-ethylpyridinum bromide in solvent; 1-5% cationic surfactant: product of reaction of primary and secondary aliphatic amine mixture with industrial-grade dimethyl phosphite; and solvent (Absorbent A) in balancing amount. Composition can also be based on straight-run gasoline containing in this case 10 to 50 vol % Absorbent A.

EFFECT: increased cleaning efficiency in combination with anticorrosive effect and reduced expenses on reagents.

2 cl, 3 tbl, 23 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: compound includes organic acidic reagent and cubic remains of amine production C17-C20, and as organic acidic reagent contains sulphamine acid with following ratio of components in percents of mass: sulphamine acid 20-70, C17-C20 the rest or mixture of sulphamine acid with nitriletetramethylphosphone acid with following ratio of components in percents of mass: sulphamine acid 10-40, nitriletetramethylphosphone acid 25-70, C17-C20 the rest.

EFFECT: higher efficiency.

2 ex, 7 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

EFFECT: higher productiveness.

2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has heating cable, placed in zone of possible paraffin-forming, and circuit for its heat control connected to it. Device is provided with two-drive transporter of heating cable, made with possible hoisting of heating cable in well with consideration of compensation of pushing force of mouth pressure on heating cable. Transporter has detachable body, consisting of two portions and provided with adjusting tying element, connected to its portions for forming pressing force to heating cable of two roller groups. Rollers with axes are mounted in detachable body. Cogs are placed on rollers axes. One roller group is connected to one drive, another group - to another drive for assuring possible transfer of rotation through cogs to roller couples. On heating cable at least one yoke is mounted with possible enveloping, which is placed on mouth packing gland and is provided with counter-exhaust cable.

EFFECT: higher efficiency.

2 cl, 4 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has serially connected, by tubing pipes, in upward direction, oval-shaped trap, check valve, connecting pipe, at least one drop valve and localizers placed on pipes. Between connecting pipe and drop valve an unloading valve is mounted. Above drop valve a preventing valve of plug type is placed. At mounting portion between unloading and preventing valves a hermetic working chamber is formed, filled with air at atmospheric pressure. Localizers are made in form of shells freely rotating on rolling bodies perpendicularly to pipes. In shells on axes, placed perpendicularly to longitudinal axis of device, freely rotating rollers are fixed. Check valve is made with possible opening and closing of pass aperture at its any position and is in form of two semi-circular spring-loaded plates, placed on common axis, and folding when pass aperture is opened. Trap has main axial input channel and input channels passing inside at angle 30, 60, 90 degrees to longitudinal axis of device, which are placed in levels along circle. Connecting pipe is made in form of replaceable bushings having different pass aperture diameters. Unloading channel is made in form plunger, fixed by shear pins in starting position in a cylinder, with solid axial channel, connected to hermetic working chamber. Said channel has output onto side plunger surface which output is sealed at starting position and is connected to lower inner space of device after destruction of shear pins and displacement of plunger to lower position, which occurs after unloading of device under effect from its weight and weight of support of tubing pipes during interaction with polluted well portion.

EFFECT: simplified operation.

8 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has hollow body with through ports along whole length, axes of which are displaced relatively to one another along spiral. Scraping elements in form of separate resilient brushes are mounted in through ports on basis of condition of providing for cleaning by working surfaces - ends of separate resilient brushes and free exit of removed deposits between brushes and hollow body. Separate resilient brushes are in form of bushings with pressed in bunches of steel wires, which are mounted in through ports with overlapping of each other and possible overlapping by working surfaces - ends of separate resilient brushes of whole inner perimeter of cleaned pipe. Bushings with pressed in bunches of wires are made enlarged in size according to inner diameter of cleaned pipe in accordance to yielding condition of separate brushes material. Spiral coiling angle is 180 degrees.

EFFECT: higher efficiency.

4 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes lowering into well, to depth of forming of deposits, of linear heating element in form of pipes column in well or of metallic conductor and feeding conductor. Heating is performed by letting high-frequency electric current through feeding conductor while providing for its locking in head portion of heating system at depth of forming of deposits. Metal of linear heating element is effected with high-frequency field of feeding conductor. Frequency of electric current is set at lower limit on basis of condition, that depth of penetration of high-frequency field into metal of linear heating element was less than its thickness. Heat production is adjusted to provide primary heat production along linear heating element by decreasing space between the latter and feeding conductor and by increasing frequency of electric current from this lower limit. Locking of electric current in head portion of heating system between heating element and feeding conductor is performed through locking element, having falling dependence of resistance from temperature increase. Frequency of electric current is set at lower limit during lowering of heating system and is increased after passing whole depth of forming of deposits and obstructions. Locking of electric current in head portion of heating system can be performed through substance, having properties of weak electrolyte, for example, through well liquid, and frequency of electric current is increased in area of manifestation of effect of steep increase in its productiveness. Device has heating system, consisting of feeding conductor and linear heating element, and locker of electric current between these in its head portion. Feeding conductor is made of coiled and isolated conductors. Linear heating element is in form of column of pipes in the well or a bare metallic conductor. Cross-section of conductor is selected to be enough for supporting weight of heating system lowered into well. Electric current locker in head portion of heating system is made in form of winding of high-frequency wire, woven on ferrite core and placed inside metallic cover in such a way, that ferrite core by end portions is locked on this cover. Grade of ferrite of core is selected from condition, that its temperature of magnetic properties loss should exceed temperature of melting of deposits in a well, but is not greater than temperature of their combustion or carbonization. Current locker in head portion of heating system may be made in form of bare electrode, connected to feeding conductor and placed relatively to heating element in such a way, that between them a channel is formed along axis of bare electrode for passing of well liquid.

EFFECT: higher efficiency, higher reliability.

2 cl, 4 dwg

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