Method for processing well-adjacent bed zone

IPC classes for russian patent Method for processing well-adjacent bed zone (RU 2255214):

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

Another patents in same IPC classes:

Method for extraction of water-clogged oil deposit / 2255212
Method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency.

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.

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.

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.

-d22

Method for processing well-adjacent bed zone / 2255214
Processing periods include forming of depression pressure change between well-adjacent bed zone and well hollow. Cleaning of well-adjacent bed zone is performed by prior feeding of fluid into well, forming of periodic pressure pulses in well-adjacent bed zone in form of fading standing wave, moving along the well, and decreasing pressure during fluid movement along well from well-adjacent bed zone to day surface for extraction of clogging. Plant for washing wells is used, which is connected to behind-pipe space of well and to tubing pipe. Behind-pipe space of well is isolated by packer along lower limit of perforation range. Perforation range is filled with sedimentation, formed from destroyed rock, and accumulated above packer as a result of gradual and even cleaning of well-adjacent bed zone along whole length of perforation range. Packer is disabled and well is washed clean, without raising tubing pipes column.

Method for speeding up extraction of hydrocarbons and device for its realization / 2256072
Method includes pulse treatment of productive bed by energy of atmospheric electricity by using lightning discharge. Prior to initialization of storm discharge voltage of electric field above well is measured using measuring block. Initiation of storm discharge is performed when reaching value of strength of electric field above well no less than 30 kV/m and enough for forming leading channel of lightning. To exclude corona as receiver of electric energy metallic mast is used, on upper end of which metallic fragment of spherical form is positioned having smooth external surface, or smooth metallic wire is used with its possible raising towards storm cloud. Output of receiver is connected to casing column of well. Powerful electric discharge along casing column and through its perforated portion gets into area of productive bed and disperses there.

Production bed treatment method / 2258803
Method involves forming new cracks and/or stimulating existent ones in production bed by serially well flushing and performing periodical depressive and repressive actions along with flushing thereof at circulation or outflow stages; isolating interval to be treated with packer; cyclic changing pressure with following injecting working liquid, for instance oil and/or at least one plug of chemical agent, for example of hydrochloric acid. All above operations are performed along with oscillating action of radiator installed in front of production bed interval to be treated.

FIELD: mining industry.

SUBSTANCE: processing periods include forming of depression pressure change between well-adjacent bed zone and well hollow. Cleaning of well-adjacent bed zone is performed by prior feeding of fluid into well, forming of periodic pressure pulses in well-adjacent bed zone in form of fading standing wave, moving along the well, and decreasing pressure during fluid movement along well from well-adjacent bed zone to day surface for extraction of clogging. Plant for washing wells is used, which is connected to behind-pipe space of well and to tubing pipe. Behind-pipe space of well is isolated by packer along lower limit of perforation range. Perforation range is filled with sedimentation, formed from destroyed rock, and accumulated above packer as a result of gradual and even cleaning of well-adjacent bed zone along whole length of perforation range. Packer is disabled and well is washed clean, without raising tubing pipes column.

EFFECT: higher efficiency.

1 dwg, 1 ex

The present invention relates to mining and can be used for development and recovery rate ekspluatatsionnykh wells, reduced due to clogging of wellbore zone of asphalt formations and solids.

A method of processing wellbore zone and device for its implementation (agliullin M.N., Kurbanov A.S., Rakhmatullin, BC, Abdullin MM Patent No. 2123591, CL. E 21 In 43/25), which produce simultaneous physical and pulse depression-repressione effect to stabilize the current values of hydroconductivity.

However, the method requires the use of the column tubing, descent equipment and cable using winches etc.

A method of processing bottom-hole formation zone (G.A. eagles, Khusainov V.M., Musabirov -, Pestrikov VI Patent No. 2169821, CL E 21 In 43/25), which descend into the well implosion device, upload the processing composition, push it into the formation, conduct cleanup by creating multiple implosion effect.

However, the method requires the use of the column tubing, packer, implosion device, the processing composition, etc.

A known method of cleaning wells from deposits in the course of its operation (Veliyev F.G., Kurbanov R.-I., Aliyev E.N., Patent No. 1700207, CL E 21 In 37/00), which periodically generate at the wellhead wave of negative pressure, which overlap with the gate valve in the discharge line and stand her in the blocked state, then open.

However, the maximum change in pressure from a hydraulic shock when opening the flow line is 1.5 MPa for a fraction of a second, which is insufficient for the formation of a powerful wave, in addition, you must use the column tubing and pump to ensure its power.

The known method development and purification wellbore zones pulsed drainage (Nosov P.I., Stockin P.D., Nurislamov NB and other Patent No. 2159326, CL E 21 In 43/25), taken as a prototype, in which the formation of the depression pressure differential between the well bore area of the reservoir and the cavity of the well is made by pre-injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave moving through the cavity wells and grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface with a sharp opening of the cavity well.

However, particles are extracted from the perforation of the well and wellbore zone unevenly, after treatment remain kolmat zone.

The objective of the invention is to clean the area of the formation adjacent to a well bore zone along the entire length of the perforated interval.

The task is solved in that, using the processing method of wellbore zone containing processing time, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well for cleaning mentioned wellbore zone by pre-injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave that moves through the borehole, and grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface for the removal of contaminants using plants for washing the wells, the installation for washing the wells connected to the annular space of the well and to pump-compressor pipe, the well annulus isolated by the packer at the bottom of the perforated interval and, to the extent filling the perforated interval the precipitate formed from the destroyed rocks and accumulate above the packer in the gradual and uniform cleaning wellbore zone along the entire length of the perforation interval, turn off the manifold and rinse well without lifting the column tubing.

This method allows to increase the turnaround time of the well due to better decolletee wellbore zone.

An example of a device for the implementation of the proposed method is illustrated in the drawing, on which: 1 - tube annulus; 2 - tubing; 3 - manifold; 4 - precipitate.

The method is implemented as follows.

Installation for washing the wells connected to the annular space of the well through the pipe 1 and pump-compressor pipe 2. The annulus is isolated by the packer 3 on the bottom of the perforated interval.

In a well with pump installed through the pipe annulus 1 pumped fluid and create pressure that is safe for the integrity of the casing and cement. Under the action of excess pressure fluid penetrates into the near-wellbore area of the formation.

For the formation of a standing shock waves open cavity annulus and when sufficient speed is reached the expiry of block fluid flow. Is formed by the pressure wave, which moves along the cavity wells from the mouth to the bottom and back, creating beats, including in the near-wellbore area of the formation. Repression-depression pulses allow you to break the adsorption deposits on the walls of the pore channels, and create fractures in the formation matrix and to break its fragments.

The formation of a standing shock wave also may impact the application of pressure to the surface of the downhole fluid at the wellhead, while the packer serves as a diverter shock wave and sends it to the near-well zone of the reservoir through the lower part of the perforated interval.

After the decay of the standing shock wave produce a flow of wellbore fluid to move viscous contaminants, solids and debris of the destroyed rocks from borehole zone in the cavity of the well, and the light components of the impurities float to the surface, fragments of destroyed rocks and solids accumulate above the packer, forming sludge 4.

When you re-formation of the shock wave and its passing through annular space whipstock is 4 sediment removed from the reservoir fragments of destroyed rock and solids. The processing of the perforation and the reservoir area above the sediment 4. Thus, the accumulation of sediment 4 is a gradual and uniform processing of wellbore zone along the entire length of the perforated interval.

As it is filled with sediment of the perforation interval, which is reflected in a sharp increase of the resistance of the injection fluid or by changing the strength of the reflected shock wave off the packer and carry out direct or reverse flushing of the well without lifting the column tubing. The processing and washing is repeated until the desired degree of purification of critical area and cavity wells from viscous and solid components of pollution.

The fluid may contain chemicals for more efficient cleaning. The method can be applied in conjunction with other types of bottomhole zone treatment: acid, heat, vibroimpulsnoj, acoustic, etc.

The processing method of wellbore zone containing processing time, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well for cleaning mentioned wellbore zone by pre-injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave that moves through the borehole, and grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface for the removal of contaminants using plants for washing the wells, characterized in that a device for washing the wells connected to the annular space of the well and to pump-compressor pipe, annulus well isolated by the packer at the bottom of the perforated interval and at least fill the perforated interval the precipitate formed from the destroyed rocks and accumulate above the packer in the gradual and uniform cleaning wellbore zone along the entire length of the perforation interval, turn off the manifold and rinse well without lifting the column tubing.