Device for cleaning the inner surface of the borehole pipe

 

The invention relates to the oil and gas industry, in particular for cleaning the inner surface of the well pipe by burning wax and hydrateparaffin sediments. Device for cleaning the inner surface of the borehole pipe includes fixed on the logging cable casing in a sealed bell installed therein coaxially liquid rocket launcher containing the nozzle facing down. Liquid rocket launcher includes tanks of oxidizer and fuel, the fuel supply system, rigidly fixed inside the rocket engine. The fuel supply system includes a main supply of oxidizer and fuel solenoids that are controlled by electrical signals from the surface through the logging cable. Increased cleaning efficiency, simplifies the treatment process control. 2 C.p. f-crystals, 1 Il.

The invention relates to the oil and gas industry, namely, to restore the productivity of oil wells by burning wax and hydrateparaffin deposits (hereinafter referred to as the sediment). In Russia, 35% of the wells are equipped with deep-sucker-rod pumps, prevodi-rocking chairs.

The principle of operation of the pumps is based on the displacement of fluid from the working space by moving the piston-plunger. Using the pumping unit is provided with a reciprocating movement of the rods and connected to the plunger them. When oil with a high content of paraffins and asphaltenes occurs as cooling lifted from the well of oil deposition of particles of paraffin, asphalt, resins on the surface of the column tubing (tubing), leading first to fall well performance, and then to the breakage of the plunger.

There are different ways of cleaning the inner surface of the borehole pipe: chemical, mechanical, thermal, thermomechanical, etc. During thermal method is the elimination of paraffin plugs into the borehole pump superheated steam, hot water or heated oil until until the fat will not dissolve.

Known devices lowered into the tubing string and warming blocked by transformation of acoustic energy (vibro-acoustic) oscillations in heat, as in C. 98102420/ 03 from 10.02.98,, IPC 6 E 21 In 37/00, Z. 99102233/03 from 10.02.99,, IPC 6 E 21 In 37/00.

In some devices, a source of heat are electric heaters, as in C. 97121527/03 from 23.12.97 g is saloobrazovanie with the speed of its natural restofline. When lifting the heater up is restofline the remaining part of the education.

There are devices comprising a case made of a reacts material filled with a chemically active substance. When reaching asphaltoresinparaffin or parfenovitch sediments body burns with the release of energy sufficient to heat the tube, Z. 96122097/03 from 21.11.96,, IPC 6 E 21 In 37/06.

The closest to the technical nature of the claimed solution is to install to eliminate hydrateparaffin sediments and ice jams in oil and gas wells according to the patent of Russian Federation №2131511, 1999.

The apparatus comprises a means of transportation and a source of hot gases in the form of a solid propellant gas generator with the nozzle facing down.

The disadvantage of this device is the inability to manage the process, including the management of excess oxidant, low calorific in the treatment area, the complexity of the charging of the solid fuel.

The aim of the invention is its universal design, simplifying the management process and increase its effectiveness.

This goal is achieved by the fact that in the proposed device, comprising a housing mounted on geophysical to the second down according to the invention the casing is made in a sealed bell, a source of high temperature combustion products are made in the form of liquid rocket launchers, including tanks oxidizer and fuel, a fuel supply system comprising a main supply of oxidizer and fuel solenoids that are controlled by electrical signals from the surface through the logging cable, and fixed inside the rocket engine.

Rocket engine is rigidly fixed inside the housing by a flange.

Because the case is sealed, the inside of the bell is formed with a gas cushion, to protect the power plant from contact with the borehole fluid.

Tanks oxidizer and fuel can be filled environmentally friendly fuel, such as methane and oxygen, and the fuel supply system can be pressure, for example, by using an inert gas of high pressure.

Tanks of fuel and oxidant can be placed outside the case and connected to the rocket engine fuel lines.

The invention is illustrated in the drawing, which shows the device in section, spuskaemogo in the tubing 1. The device consists of a housing 2, turn on logging 5 and 6 fuel, divided among themselves. Tanks filled with gas pressurization 7. Inside is the rocket engine 8, is rigidly fixed by a flange 9. The engine contains the mixing head 10, line feed oxidant and fuel 11, the combustion chamber 12 and nozzle 13. The fuel in the mixing head is on highways 11 and is regulated by solenoid valves 14. Wax and hydrateparaffin deposits shown symbolically at number 15.

The device operates as follows. Curb on the surface of the body 2 is lowered on the logging cable 3 into the tubing string 1 up until the lower edge of the housing 2 will not run into the deposition 15. Because the case is sealed, it retains an air bag that protects located in the housing 4 tanks with oxidizer 5 and 6 fuel rocket engine 8 and the solenoid valves 14 from contact with the borehole fluid.

After stopping device through logging cable 3 is fed an electrical signal for opening the solenoid valves 14. Under the pressure of the gas pressurization 7 oxidizer and fuel in the mains supply of the oxidizer and fuel 11 are received in the mixing head 10, are mixed, ignited and react in the combustion chamber 12, and an oxidant POU, which depends on the ratio of the area of the output and the minimum cross-sections. Temperature TS can reach up To 3500 depending on the fuel components and their relationships.

From thermal effects of reverse flows substation power plant protects the flange 9.

At the end of PS in the well is pushing the downhole fluid from the surface sediments and thermal jet begins to interact with substances in the sediments. Since they are mostly hydrocarbons, happens first softening, then melting and, finally, the reaction of the substances deposits with an excess of oxidant present in the gas stream.

Since the expiration of the substation is turbulent in nature, all these processes are intensified as well, in parallel, the interaction of the jet with PS material deposits, its softening, tear drops, which, falling into the flow of the high temperature products of combustion, burn with the formation of CO2, SO2N2About and other Joint thermal, dynamical and chemical effects of PS leads to rapid destruction of the deposits.

As burning fat, the body is pushed down the tubing string and the casing wall perform the role of a scraper that removes residues from the notes. However, if necessary it is possible to provide a mechanism becoming jammed the case at the time of his work.

Upon completion of the cleaning process the command to close the valve, and the device rises to the top.

As fuel can be used, for example, organic matter methane and oxygen.

If necessary the tanks with the oxidizer and fuel can be placed outside of the device, for example on the surface of the earth. In this case, the fuel is in the fuel lines, connecting the tanks with rocket engine installed in the bell. This embodiment is useful when the device is used in shallow wells. The advantage of the latter design is the absence of restrictions on fuel supplies.

Claims

1. Device for cleaning the inner surface of the borehole pipes containing fixed on the logging cable casing, a fixed coaxially source of high-temperature combustion products containing the nozzle facing downwards, characterized in that the casing is made in a sealed bell, a source of high temperature combustion products are made in videgaray supply of oxidizer and fuel solenoids, managed electrical signals from the surface through the logging cable, and fixed inside the rocket engine.

2. The device under item 1, characterized in that the fuel supply system is pressure.

3. Device according to one of paragraphs.1 and 2, characterized in that the oxidizer tanks and fuel dressed environmentally friendly fuel, such as methane and oxygen.

 

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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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