Device for complex treatment of face-adjacent well zone

IPC classes for russian patent Device for complex treatment of face-adjacent well zone (RU 2253011):

E21B43/27 - by use of eroding chemicals, e.g. acids

E21B43/25 - Methods for stimulating production (dump bailers E21B0027020000; vibration generating arrangements E21B0028000000; chemical compositions therefor C09K0008600000)

Another patents in same IPC classes:

Acidic surfactant compound for processing face-adjacent zone / 2249101
Compound for processing face-adjacent bed zone includes mixture of inhibited hydrochloric and HCl and fluorine-hydrogen acid HF, non-ionogenic surfactant, asphalt-resin-paraffin precipitations solvent and water, additionally has mutual solvent and oxyethylenediphosphone acid and/or vinegar acid with following ratio of components in percents of mass: HCl 3-23, HF 0.5-5, surfactant 0.1-1, solvent 0.3-3, acid and/or vinegar acid 0.05-6, mutual solvent 10-30, water the rest. As mutual solvent compound contains low spirits: isopropylene spirits or methanol, or ethanol, or acetone, or spirits-containing industrial wastes.

Method for processing underground productive beds / 2249097
Method includes injection of processing liquid into bed, which liquid contains solved or dispersed in water complicated ether and polymer destructor, selected from oxidizing destructor and ferment destructor in such a way, that complicated ether is hydrolyzed with production of organic acid for solution of material soluble in acid, present in filtering layer or adjacent to it or in other damage in productive bed, and polymer destructor destroys polymer material, present in filtering layer or bio-film in productive bed.

Method for acidic treatment of productive bed / 2247833
Method includes serial pumping of film-forming hydrocarbon liquid and hydrochloric acid with adding of salt-acidic corrosion inhibitor to these, as said inhibitor a special paraffin deposits inhibitor is used, in form of composition of surfactants and aromatic solvents, while hydrochloric acid with addition of inhibitor before pumping is dispersed with gas to receive foam.

Method for range-wise treatment of productive layer through open horizontal well shaft and device for realization of said method / 2247832
Method includes determining porosity, penetrability and oil saturation level of shaft-adjacent area along whole length of deflected shaft. On basis of these ranges with low penetrability are detected, caverns presence level and diameters of shaft on ends thereof are determined. With consideration of characteristics of detected ranges at surface a pipe assembly is assembled, at end of which a ring saddle is mounted for locking ball, on both ends - hydraulic packers. Between these in assembly pipe a radial through calibrated channel is made. Pipe assembly is fixed at end of pipes column and these are lowered into chamber to level of deflected shaft mouth. With unpacked packers straight and backward washing of shaft is performed. After that acid is pumped into well in amount, equal to amount of first treatment range. Locking ball is dropped, first from the face shaft range with low penetrability is packed and concurrently acid is pressed therein, after that well is left for reaction. Then both packers are unpacked, backward washing of shaft is performed. By raising pipe column, pipe assembly with packers is transferred in backward, from face, direction into area of second, from face, range with low penetrability and above-mentioned operations are repeated. In turns, operations with each treatment range are performed.

Oil extraction methods / 2247235
Method includes treatment of face area of oil bed by hydrophobic powder in organic and pushing oil away from collector with following delivery of oil from face-adjacent area of extraction well for processing of oil-containing terrigenic bed into organic solvent additionally inserted is copolymer of ethylene with vinylacetate, well treatment is performed with relation of components in percents of mass: said powder 0.05-2, said copolymer 0,05-2, organic solvent - the rest.

Method for increasing productiveness of oil and gas wells / 2247234
Method includes acidic treatment of bed, calculation of hardness decrease and pressure of rocks tearing and pressure for pressing working solution into bed, completion of well and the actual hydraulic tear. Pressure for pressing is determined from formula P_ht=(2μ·P_m/(1-μ)+(1-3μ)·P_b/(1-μ), where P_ht - rocks tear pressure, P_m - mountain pressure, P_b - bed pressure, μ - Poisson coefficient.

Composition for declaying of bottom-hole formation zone / 2246612
Declaying composition contains clay dispersing reagent, peroxide compound and water, wherein as peroxide compound potassium fluoride peroxysolvate in activated form, comprising 1-3 mass % of oxalic or salicylic acid; and includes two sequential technological solutions. More specifically claimed composition contains (mass %): technological solutions 1: potassium fluoride peroxysolvate 1-2.5; hydrochloric acid as clay dispersing reagent 3-8.0; and balance: water; technological solutions 2: potassium fluoride peroxysolvate 1-2.5; sodium hydroxide as clay dispersing reagent 4-6.0; and balance: water. In addition said solution contain 0.1-1.0 mass % of water soluble surfactant. After treatment with disclosed solutions and well exposure dispersed reaction products are removed from bottom-hole formation zone.

Acid composition for treating terrigenous oil reservoirs and a method for acid treatment of bottom area of formation / 2244816
Invention provides composition that can be used to intensify oil inflow and to develop well by means of acid treatment of terrigenous oil reservoir as well as to intensify oil inflow and to increase oil recovery of formations with the aid of hydraulic rupture of formation assisted by acid solutions. Composition contains borohydrofluoric acid needed to create borosilicate films prohibiting migration of particles during acid treatment. In addition, composition is characterized by lowered rate of reaction with rock at formation temperature in order to extend coverage of formation by treatment and to diminish deposit formation risk, low surface tension, low corrosion rate, and compatibility with inhibitors added to commercial acid, which will enhance efficiency of acid treatment using composition of invention. Composition is made up of, wt %: inhibited hydrochloric acid 8.0-15.0, fluorine-containing reagent (hydrofluoric acid, ammonium bifluoride, or ammonium fluoride) 1.5-10.0, boric acid 1.0-3.0, additionally isopropyl alcohol 5.0-10.0, and "Alkylfosfat-Khimeko" or "Efiroks-7", or "Fosfol-10" 0.5-2.0, and fresh water to 100%. In a method of acid treatment of the bottom area of terrigenous formation comprising consecutively pumping flushing fluid and acid composition into borehole, forcing the latter into formation by the aid of flushing fluid, giving time (up to 8 h) for reaction and subsequent removal of reaction products. Acid composition is used as it is or in the form of aqueous solution obtained by diluting composition with fresh water at water-to-composition ratio (1-5):1 in amount corresponding to 0.5-2.0 m³ per 1 m of perforated thickness of the formation. As flushing fluid, 1.5-3.0% ammonium chloride solution is used in amount 0.5-1.5 m³/m before pumping of acid composition or in amount 1.0-5.0 m³/m when used to force acid composition.

Composition for treating bottom zones of wells / 2244114
Invention relates to compositions used for intensifying wells owing to increasing permeability of rocks forming well bottom zones. Composition of invention contains 7.0 to 30.0% ethanol, 0.1 to 0.3% cupric chloride, 0.1 to 0.5% alkylbenzenesulfonate, and trichloroacetic acid (to 100%).

Device for treating well walls within range of productive bed / 2244112
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.

Device for effecting face-adjacent zone of productive wells bed / 2249686
Device has receiving chamber with solid-fuel charges and igniter, combustible plug and air chamber with atmospheric pressure. Receiving chamber is perforated along whole length by apertures for outlet of combustion products. Charge adjacent to upper end of receiving chamber burns from its end. It is made of heat-resistant low-gas slow-burning compound with high temperature of combustion products and high caloricity, with low dependence of burning speed from pressure and it is protected from burning at side surface by compound preventing burning thereon, but burning together with charge. Charge, adjacent to plug, is of channel construction, quick-combustible, and it is made of heat-resistant gas-generating compound. Igniter is mounted in upper end of charge, adjacent to upper end of receiving chamber. Air chamber with atmospheric pressure is placed below receiving chamber.

Method and device for affecting beds, containing liquid substances / 2249685
Device has pump, placed on well mouth equipment, tubing string, passing downwards in casing string of well. Node of hollow cylinders is connected to lower portion of tubing string. A couple of pistons is placed inside cylinders node and connected to pump via pump bars and gland rod. For compression of liquid within cylinders node, pump is enabled. Compressed liquid is outputted into casing column, and strike wave is formed as a result. Cylinders node includes upper cylinder, lower cylinder. Transfer cylinder is placed below upper and above lower cylinders. Cylinder with compression chamber is placed between transfer cylinder and upper cylinder. Lower cylinder is made with possible placement of lower piston, and upper cylinder is made with possible placement of upper piston. Lower piston has larger diameter, than upper piston. Displacement of piston affects volume of compression chamber, decreasing it. Liquid in the chamber is compressed. During downward movement of piston liquid is lowered into well. Seismic data from wells at remote locations are gathered and processed.

Method for cleaning face-adjacent bed area / 2246610
Method includes forming of gas pillow by forcing gas into inter-tubular space. Further pushing liquid is forced therein with forcing away of liquid from inter-tubular space along tubing column into tank or store, pressure is dropped from inter-tubular space down to atmospheric and hydro-impact is used to effect well face by rotating liquid flow from tubing column. Pillow is formed by plant for forcing pushing liquid and gases. As gas, mixture of air and exhaust gases is used in relation no greater than 2:3. pillow pressure provides for prevention of gas from getting into tubing column. Volume of pushing liquid is determined from formula: V_pl=0.785^.(d21

-d22

)^.(H_T-H_gp-H_i-t)^.10^-6, where d₁ - inner diameter of casing column, mm; d₂ - outer diameter of tubing pipes, mm; H_T - depth of lowering tubing column in well, m; H_gp - height of gas pillow in inter-tubular space, m; H_gp=K·P_gp; K - hydrostatic coefficient of resistance to pushing of liquid and gas (K=100 m/MPa), m/MPa; P_gp - end pressure of gas pillow, MPa; H_i-t - inter-tubular space height.

Method of treating bottom zone of injecting wells / 2244113
Groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

-d22

Device for complex treatment of face-adjacent well zone / 2253011
Device for complex treatment of face-adjacent well zone has thermal gas-generator charged with fuel with electric igniter and pipe-shaped container with acid solution, made with perforation apertures, both mounted on rope-cable. Acid solution is positioned in thermal-melting hermetic tank inside the container. Device is additionally provided with depression chamber and impact-wave effect chamber, containing remotely controlled fast-action locks, with two packers, mounted at ends of pipe-shaped container. Packers are opened under pressure from gases from gas generator. After operation of gas generator is finished, packers release pipe-shaped container. Depression chamber, impact-wave effect chamber and gas generator are jointly connected.

FIELD: oil industry.

SUBSTANCE: device for complex treatment of face-adjacent well zone has thermal gas-generator charged with fuel with electric igniter and pipe-shaped container with acid solution, made with perforation apertures, both mounted on rope-cable. Acid solution is positioned in thermal-melting hermetic tank inside the container. Device is additionally provided with depression chamber and impact-wave effect chamber, containing remotely controlled fast-action locks, with two packers, mounted at ends of pipe-shaped container. Packers are opened under pressure from gases from gas generator. After operation of gas generator is finished, packers release pipe-shaped container. Depression chamber, impact-wave effect chamber and gas generator are jointly connected.

EFFECT: higher efficiency.

2 cl, 1 dwg

The invention relates to the oil industry and can be used for complex processing and treatment of bottom-hole zone of the well.

A device for the acid treatment of bottom-hole zone of the well, including valves for wellhead, pumping unit for pumping acid into the well, the tank truck for transportation of acids, manifold for connection with a tanker reception pump and wellhead equipment /Molchanov, GV and other Machines and equipment for oil and gas. - M.: Nedra, 1984. - s-422/.

The disadvantages of the system are the complexity of the equipment needed for cleaning the well bottom-hole zone, and low processing efficiency (45-55%).

It is also known a device for the integrated treatment of bottom-hole zone of the well, including installed on the cable-the cable is equipped with fuel thermogenerator with electric igniter and a tubular container with the acid solution, and the tubular container is made with perforations, and the acid solution is placed in a sealed container inside a container. /Pavlenko GA and other Intensification of flows of oil and gas using thermodynamic methods of influence on the PPP. Petroleum engineering. No. 6, 1999. - p.29-35/.

The disadvantage of this device is that it does not provide timely cleanup item is Sabinas zone of the reservoir (PPP) from the reaction products of the acid with rock and asphalt, resin and paraffin deposits (ARPD), resulting in the cooling of the reaction products and the transition to the solid phase of high molecular weight hydrocarbons, which significantly reduces the processing efficiency of bottom-hole zone of the well. This device is accepted by us for the prototype.

The objective of the invention is to improve the efficiency of processing bottom-hole zone of the well.

The technical result is achieved in that the device complex treatment of bottom-hole zone of the well, including installed on the cable-the cable is equipped with fuel thermogenerator with electric igniter and a tubular container with the acid solution made with perforations. The acid solution is placed in a hot-melt sealed containers. The device is further provided with a depression Luggage and Luggage shock wave impact. Both contain a remotely operated quick-acting closures. The tubular container is provided with two packers are installed on the ends and pop-under pressure gases from thermogenerator.

Depression Luggage, Luggage shock wave exposure and thermogenerator are connected pivotally. Depression Luggage made of drilling high-pressure hoses.

The invention consists in that the supply device additionally depression camera, camera beats the RNO-wave effects and the two packers, limiting the treatment area, there is the possibility of thermochemical processing, extracts after exposure to and removal of the reaction products in strictly measured time interval and at a given plot of the PPP, which significantly improves the processing efficiency of bottom-hole zone of the well.

The drawing shows the proposed device complex treatment of bottom-hole zone of the well.

The device has installed on the cable-the cable 1 connected to each other through hinges 2 and 3 depression chamber 4, the shock wave chamber 5 and thermogenerator 6, under which is mounted a tubular container 7 is sealed with hot-melt capacity of 8 for acid solution.

Depression chamber 4 made of drilling high-pressure hose and is equipped with a remotely controlled via cable 9 fast shutter 10. Shock wave chamber 5 is made of tubing and is also provided with a fast shutter 11 is controlled by a cable 9. Fast-acting valves 10 and 11 have the same structure and contain the differential piston, the cylinder, the actuator and the position lock (not shown).

The housing 12 thermogenerator 6 made of steel pipes with internal ceramic lining 13. Thermogenerator 6 fitted with a sealed cable head 14, the firmness of the smoke fuel in the form of checkers 15 with an axial hole 16, the electric igniter 17 mounted on the lower pieces and connected by wires 18 with the cable head 14 and the cable 9. At the bottom of the body cavity 12 thermogenerator 6 posted by the cooling chamber 19, the inner surface of which is lined cooler gases 20. Pieces 15 are held at a given level by means of a lattice 21.

At the ends of the container 7 mounted packers 22 and 23 connected respectively through the bypass channels 24 and 25 with the inner cavity of the container 7. Between thermogenerators 6 and the upper packer 22 posted by hot melt membrane 26. Tubular container 7 is made with perforations 27 and is provided with an airtight container 8 to a solution of acid, such as hydrochloric. Capacity 8 made of a material raspravlyayuschegosya under the influence of high temperature, for example of polyethylene. The lower end of the packer 23 is provided with a lug 28, withstand high pressure and temperature of the hot gases. Connection thermogenerator 6 packer 22 is carried out by means of a coupling 29. As the wire rope cable 1 use multi-conductor logging cable, can withstand loads of up to 5 tons. The cable 9 is attached to the chambers 4 and 5 metal belts 30. Casing 31 provided with perforations 32, connecting the well with the bottom hole zone of the reservoir 33. Depression Kam is RA 4 is also equipped with a plug 34 and is made with the adoptive Windows 35. Shock wave chamber 5 is made with Windows 36. The annular space 37 is formed by the casing 31 and the container 7.

The device operates as follows. Before processing the well cleaned, washed and filled with water with a minimum content of mechanical impurities. After equipment thermogenerator 6 necessary elements: fuel 15, the electric igniter 17, cable head 14, and the container 7 is an acid solution into the well consistently lower container 7 with the packers 22 and 23, thermogenerator 6, the shock wave chamber 5 and the depression chamber 4. Simultaneously with the descent from the outside of the chambers 5 and 4 is attached to the cable 9. The container 7 with an acid solution and with the packers 22, 23 is placed in front of the perforations 32 of the casing 31. From a power source (not shown) on the cable 9, through the cable head 14 is pulse of current to the electric igniter 17, which triggers the beginning of the combustion process checkers 15 solid fuel. The membrane 26 is melted and hot gases under high pressure through the channels 24 and 25 reveal the packers 22 and 23 and push the acid solution from the hot melt tank 8 through the perforations 27 in the container 7 and 32 in the casing 31 in the bottom zone 33. Hot gases pass through the cooling chamber 19 with the cooler 20, which reduces the rate is the temperature and gas pressure to the desired value.

After completing thermogenerator 6 the pressure in the bottomhole zone 33 is reduced and the container 7 raspberrys.

After exposure, is required for the chemical effects of acid on the bottom zone of the well, the cable 9 is fed a current pulse on a fast shutter 11 of the shock wave chamber 5, which is fast (0.1...0.3 MS) opens the receiving window 36. As a result, in the annular space 37 is formed by a short pressure pulse with a significant pressure gradient, which initiates a shock wave process, contributing to the waste reaction and dirt from the bottom-hole zone of the well. Final cleaning of the PPP is the inclusion of the depression chamber 4 by filing a current pulse through the cable 9 on a fast shutter 10. Opening reception window 35, there is a pulse of vacuum (pressure inside the chamber to atmospheric), resulting in the removal of reaction products from the PPP.

After finishing the first interval of the PPP unit elements raise to the surface, cleaned, seasoned and again lowered into the well to the processing of the next interval.

Petrovka container 7 packers 22 and 23 limits the impact zone on the PPP, thus increasing the effectiveness of its treatment.

The hinged connection of the main elements of the device of depression of the camera, shock wave to the measures and thermogenerator - improves the reliability of fastening them to each other and reduces the risk of accident during the descent into the well in difficult operating conditions, especially at the greater curvature of the wellbore.

Execution of depression chamber 4 of the flexible drilling high-pressure hoses, having a minimum burst pressure of more than 30 MPa, also increases the reliability of the device operation in difficult conditions.

Thus, the supply device additionally depression Luggage and Luggage shock-wave effects and the two packers, limiting the treatment area PPP, improves performance and increases the production of the well.

1. The device complex treatment of bottom-hole zone of the well, including installed on the cable-the cable is equipped with fuel thermogenerator with electric igniter and a tubular container with the acid solution made with perforations, and the acid solution is placed in a hot-melt sealed containers inside the tubular container, characterized in that it further provided with a depression the camera and the camera is shock-wave effects, contains a remotely operated quick-acting closures, and two packers mounted on the ends of the tubular container, drop down under the pressure of the gases thermogenerator and raspotroshila tubular container is donkey shutdown thermogenerator.

2. The device according to claim 1, characterized in that the depression chamber, the shock wave exposure and thermogenerator are connected pivotally.