Method and device for generating wave field at injector bottomhole with automatic tuning of generation resonant mode

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to the oil producing industry and intended for the improvement of oil recovery of productive formations. The method for generating a wave field at an injector bottomhole with the automatic tuning of a generation resonant mode lies in the generation of pressure fluctuations in a fluid flow pumped to a productive formation through tubing strings by its pumping through the flow-excited Helmholtz resonator (FEHR). At that the respective flow rate and the FEHR volume is maintained at the cross-section of a feed nozzle. Moreover the respective flow rate at the cross-section of the feed nozzle and the FEHR volume is maintained due to the movement of its downstream rare bottom, thus increasing the FEHR volume at a reduced flow rate and reduced FEHR volume at an increased flow rate. The device used to this end consists of FEHR installed inside the tubing string; it represents a hollow cylindrical chamber with flat bottoms. In the front chamber of the bottom the feed nozzle is mounted and a discharge outlet with sharp edges is made at the rare bottom. At that the rare bottom is made movable and inside the tubing string behind FEHR there is a fixed hydraulic cylinder with a spring-supported piston connected by a rod to the movable rare bottom. At that the cavity inside the hydraulic cylinder in front of the piston is connected downstream to the inner volume of the tubing string while the cavity behind the piston is communicated to the annular space.

EFFECT: improved efficiency to maintain the stable high intensity of the wave field at the bottomhole.

4 cl, 2 dwg

 

The invention relates to the oil industry and is intended to increase the mobility of the formation fluids.

There is a method of generation of the wave field at the bottom of injection well (see patent No. 2399746), which form the pressure fluctuations in the fluid flow injected into the reservoir through the tubing (tubing), pumping the fluid through the jet cavity.

Drops of oil and water is the fluid that fills the capillaries productive oil reservoir, have low mobility due to a number of reasons. Their movement through the formation to the production well accelerate, pramuria around several injection wells, which under high pressure is injected into the reservoir various technical liquids. Oil has long been observed that the injection of fluids into the reservoir shocks contributes to a better output of fluids through the production well. For generating pressure fluctuations in the flow of the injected fluid using a special device - jet resonator, which converts the kinetic energy of the flow in the vibrational energy.

On injection wells in the reservoir serves fluid: water, air, steam, chemicals. In well insert tubing (tubing), at the lower end of which is mounted the jet cavity. P is given in the reservoir fluid is pumped through the jet cavity, which excite in the flow of the pressure fluctuations. These pressure fluctuations are propagated in all directions in the form of acoustic waves forming on the bottom hole of the wave field (see patent No. 2122109).

Also there is a method of generating pressure fluctuations in the stream of flowing fluid, implemented in the jet resonator (see patent No. 2077960) by pumping fluid through the jet cavity with the nozzle and the outlet opening with sharp edges, the volume of which is coordinated with the speed of a jet on the cut of the supply nozzle.

Injected into the well fluid is fed to the input of the supply nozzle to form a jet directed at the sharp edge of the outlet. At the same time in adjacent to a sharp edge region formed local perturbations of pressure, called the tone holes, the amplitude of which is small. If the stream velocity is chosen so that the frequency of the tone holes coincides with the natural frequency of the camera inkjet resonator, it is the resonance, and the amplitude of the tone holes are multiplied.

The disadvantage of this method is the low amplification factor of the ring resonator.

There is a method of generating pressure fluctuations in the stream of flowing fluid, implemented in the jet Helmholtz resonator (see Morel Th. Experimental study on the of cillator Helmholtz managed by the jet. Translation TDC No.-56251 from J. Fluid Engineering, 1979, 101, IX, No. 3, 383-390), which form the pressure fluctuations in the fluid flow injected into the reservoir through the tubing (tubing), by pumping through inkjet Helmholtz resonator (AWG), and support in accordance with the flow rate on the cut of the supply nozzle and the volume (AWG).

Since the passage area of the nozzle is constant, the velocity of the jet at the nozzle exit is determined by the value of the differential pressure device and is set by the flow of pumped fluid. More fluid flow is greater and the speed of the jet and Vice versa. When you change the speed of the jet, namekawa on sharp edges outlet is changed and the frequency of the tone holes, despite the fact that the resonator is tuned to a specific frequency. When the frequency deviation of the tone holes on the frequency of oscillations of the resonator amplitude generation decreases.

The disadvantage of this method is the narrow operating range changes the speed of the jet.

Known inkjet Helmholtz resonator that is closest to the technical essence and is used as a prototype (see Experimental Study of a Jet-Driven Helmholtz Oscillator, J. Fluids Eng., September 1979, Volume 101, Issue 3, p.383, doi:10.1115/1.3448983, Translation TDC No.-56251 from J. Fluid Engineering, 1979, 101, IX, No. 3, 383-390), which is a hollow body of revolution, comprising: a shell, zakreplennymi two bottoms; the input nozzle is installed in the front, in the direction of flow, the bottom; and coaxially with the nozzle output channel with sharp edges, arranged in opposite, the bottom of the output.

Inkjet Helmholtz resonator (EAP) consists of two flat parallel-plate, between which is clamped shell. Typically, the shell executes a cylindrical shape, but there are shells of square section. While in the input flat bottom arranged round the inlet nozzle, which can be inside the camera, but in the opposite, the output flat bottom round output channel with sharp edges. The output channel is a sleeve with sharp edges, installed in the bottom of the generator, or just a hole. The sleeve can also be inside the camera. The nozzle and output channel are aligned in relation to each other and are located on the axis of the cylindrical shell.

In the jet cavity formed local perturbations of pressure in the sharp edges of the outlet. The liquid column contained in the resonator, is responsible for converting the frequency spectrum spreading it acoustic waves, with increased harmonics corresponding to the natural frequency of the pole. But no reflection of the incident waves work resonator will stop. From this it follows that the wave amplification in C is lindre occurs only in the direction along the stream, between the end of the parallel bottoms. When the distribution in the transverse direction, the reflection from cylindrical shells, waves dissipate.

Liquid jet formed in the supply nozzle, when the leakage from the resonator touches its periphery sharp edges outlet. This generates local pressure disturbances propagating in all directions in the form of acoustic waves. This so-called tone holes. The amplitude of the local perturbations of the pressure is small, but when its frequency coincides with the natural frequency of resonator, it is the resonance, and the amplitude increases by orders of magnitude.

The natural frequency of the cylindrical resonator is determined by the distance between the bottoms and to a lesser extent depends on its diameter. If the distance between the bottoms of L is constant, the velocity of the jet must be strictly defined, otherwise the resonance is not possible. Yet it should be noted that the bandwidth of the amplification of acoustic resonators is much broader than, for example, piezoelectric ceramics having, at the same time, a significantly larger gain. From this it follows that there is some interval of values of the flow rate determined by the resonator, in which occurs the resonance. The largest increase in the amplitude of the tone holes occurs at the natural frequency to lebani resonator, but when the speed deviation of the jet maximum value of the amplitude is still increasing, but with less gain.

The disadvantage of inkjet Helmholtz resonator (EAP), taken as a prototype, is the inability to adjust the frequency of its own fluctuations and adjustment of the resonant mode when the differential pressure on the device.

The technical result is achieved due to the fact that in the method of generating the wave field at the bottom of injection wells with automatic tuning of the resonant mode of generation, which form the pressure fluctuations in the fluid flow injected into the reservoir through the tubing (tubing), by pumping through the jet generator Helmholtz (AWG), and support in accordance with the speed of a jet on the cut of the supply nozzle and the amount of EAP support in accordance with the speed of a jet on the cut of the supply nozzle and the volume of the AWG by moving its rear, in the direction of flow, bottom, providing the increase of the AWG at the reduction of jet velocity and volume reduction of the AWG with increasing jet velocity.

The device, consisting of inkjet Helmholtz resonator (AWG) installed inside the tubing (tubing), and represents a hollow cylindrical chamber with a PLoS what their bottoms, front bottom where the power nozzle, and back plate made the hole with sharp edges, the back plate is made movable, and the inside of the tubing, for the AWG, still has a hydraulic cylinder with a spring-loaded piston connected by a rod with a movable back plate, and the cavity inside the cylinder before the piston in the direction of flow, is connected with the internal volume of the tubing, and the cavity behind the piston is in communication with the annular space.

The proposed method can achieve high intensity of the wave field at the bottom of the pumping well due to the coordination of operational parameters and structural dimensions of the jet cavity, when generating pressure fluctuations in the flow of the flowing fluid, and maximum gain.

In Fig.1 presents a diagram of the inkjet resonator with automatic tuning and a hydraulic drive.

In Fig.2 shows the amplitude-frequency characteristic of the acoustic resonator.

The invention consists in the following.

In domestic technical literature this combined device is called by the name of the part, which attracts more attention of the author. Jet generator, or an inkjet resonator. Although, if we talk about the resonator, the resonator still, acoustic, and not strain the th. This same error is made in the translation of an article by T. Morell, from which to take the prototype. Foreign technical literature is a device called an oscillator, but in English the concept of oscillator often used in electronics.

We should not forget that resonates not the body cavity, and the liquid column, the prisoner inside, although the case, of course, also sounds, but its natural frequency is usually much lower. The passive resonator, it only responds, i.e., increases the pressure fluctuations generated by some other device, because it contained the liquid column almost motionless. The generator is active, he creates pressure fluctuations, because it consists of a high speed jet, having a reserve of kinetic energy.

Usually the dimensions of the AWG unchanged. Maximum gain resonator tone holes is achieved at a certain flow rate, measured at the nozzle exit. However, increasing the liquid flow rate increases the jet velocity and the frequency of the tone holes also increases at the same time, and decreasing the speed of the jet decreases.

For matching the speed of the jet with the volume of the resonator is proposed to move the bottom of the resonator to change the frequency of oscillations of the resonator in accordance with changes in the speed of the jet: when is velichanii speed jets you should reduce the distance between the bottoms, and when reducing the speed of the jet is increased. When increasing the jet velocity increases, the frequency of the tone holes, and to ensure maximum gain should the natural frequency of the resonator to increase (see Fig.2), which should reduce the characteristic size of the resonator. And Vice versa: when reducing the speed of the jet decreases the frequency of the tone holes, and should reduce the frequency of natural oscillations of the resonator, i.e., to increase the characteristic size of the resonator.

For automatic configuration of the cavity in the casing for the resonator (in the direction of flow) install the cylinder with the piston connected by a rod to the back plate of the resonator. The piston divides the cylinder into two chambers, the rear communicates with the annular space, and the front is connected with the internal volume of the tubing.

At a design flow rate and the pressure drop across the cavity, the piston occupies a position in the middle of the cylinder. By increasing the pressure in the tubing for cavity pressure difference across the cavity decreases and the stream velocity is also reduced. The increase of pressure in the tubing behind the resonator will increase the pressure in the anterior chamber of the cylinder before the piston and cause the piston to move in the direction of less pressure and pull the bottom of the resonator. The increase of pressure in the tubing for resonator which moves the piston of the hydraulic cylinder and the back plate of the resonator to increase the distance between the bottoms. This leads to an increase in the frequency of natural oscillations of the resonator and adjusts the resonance frequency of the tone holes.

You can install the cylinders on both sides of the AWG. With increasing pressure before the AWG and the speed of the jet piston front cylinder must move the front bottom stream to reduce the amount of the AWG and the increased frequency of natural oscillations, and at reduced pressure before the AWG to move forward against the bottom of the stream to increase the AWG and reduce the frequency of natural oscillations. Rear cylinder should also push the bottom when reducing the pressure drop across the device and to move the bottom with increasing differential. Installation of hydraulic cylinders on both sides of the AWG will allow you to automatically keep track of all the possible combinations of pressure changes in the tubing, both before and during the AWG.

A device for the excitation of the wave field at the bottom hole injection wells, which includes the AWG and the hydraulic actuator is placed inside the tubing. The AWG consists of a hollow chamber consisting of a cylindrical shell 1 (see Fig.1) with a flat bottom on both ends. In the front (in the direction of flow) bottom 2 installed nozzle 3, which is a sleeve with rounded edges at the entrance. In the back plate 4 made 5 hole with a sharp entrance edge. For the AWG has gidrol is indr 7 with the piston, which is connected by a rod 6 with the bracket on the outer side of the back plate of the AWG. Itself back plate form also represents the piston due to the presence of long cylindrical wall, the so-called “ skirts”, designed to prevent distortion of the bottom when it is moved. The movable bottom is centered in a cylindrical ring resonator using a “skirt” with o-ring. If both heads are movable, they both represent the same piston attached to the rod.

For inkjet resonator inside the tubing is installed stationary cylinder with a piston and two Windows. The piston divides the internal volume of the cylinder into two parts: the one closest to the AWG part of the internal volume of the cylinder is connected And with the internal volume of the tubing, and far from the jet cavity portion of the internal volume of the cylinder is communicated with the annular space. If the tubing is equipped with two hydraulic cylinders on both sides of the jet cavity to move both ends of the resonator, the logic remains the same - increasing the pressure drop across the nozzle plate closer, lower pressure drop of the bottom opening.

Works AWG with automatic tuning as follows. The liquid is supplied under a certain pressure on the tubing on the bottom hole where the pipe is installed the AWG. The liquid flows vsrg through the power nozzle and flows out through the exhaust hole in the back plate. When this jet is formed at a certain speed, which further hurt its periphery sharp edge of the hole, and, consequently, in the marginal region formed local pressure disturbances of small amplitude, which spread around in the form of acoustic waves at a certain frequency.

Because the frequency propagating in the resonator acoustic wave matches the natural frequency of the liquid column enclosed within the resonator, the amplitude of pressure fluctuations in the fluid flow increases. Further, the liquid through the perforations in the tubing is fed into the reservoir and causes fluctuation of fluids in the pore space.

When the magnitude of back pressure for the AWG, the pressure drop across the device will decrease, which will lead to the reduction of jet velocity and decrease the frequency of the tone holes. The increase in the pressure inside the tubing for the AWG will force to move the piston of the rear cylinder further from the AWG and drag a back plate of the AWG that will increase the volume of the cavity and, accordingly, decrease the frequency of its own vibrations. The AWG will be back to work in a consistent mode with maximum gain.

When you decrease the back pressure for the AWG everything will happen on the contrary: the stream velocity will increase the frequency of the tone holes will also increase, but the reduction of pressure for the AWG will force to move the piston of the hydraulic cylinder in the direction of the resonator and to bring back plate with the front. This will lead to an increase in the frequency of natural oscillations of the liquid column in the cavity and configure it to work with maximum gain at a higher frequency.

1. The way to generate a wave field at the bottom of injection wells with automatic tuning of the resonant mode of generation, which form the pressure fluctuations in the fluid flow injected into the reservoir through the tubing (tubing), by pumping through inkjet Helmholtz resonator (AWG), and support in accordance with the speed of a jet on the cut of the supply nozzle and the volume of the AWG, characterized in that the support in accordance with the speed of a jet on the cut of the supply nozzle and the volume of the AWG by moving its rear, in the direction of flow, bottom, providing the increase of the AWG at the reduction of jet velocity and volume reduction of the AWG with increasing jet velocity.

2. The method according to p. 1, characterized in that the support in accordance with the speed of a jet on the cut of the supply nozzle and the volume of the AWG by moving its both ends.

3. A device for implementing the method according to p. 1, consisting of inkjet Helmholtz resonator (AWG) that is installed inside the pump and to the pressure pipe (tubing), and represents a hollow cylindrical chamber with a flat bottom, front bottom which place the nozzle of power, and in the back plate perform the hole with sharp edges, characterized in that the back plate is made movable, and the inside of the tubing, for the AWG, still has a hydraulic cylinder with a spring-loaded piston connected by a rod with a movable back plate, and the cavity inside the cylinder before the piston in the direction of flow, is connected with the internal volume of the tubing, and the cavity behind the piston is in communication with the annular space.

4. The device according to p. 3, characterized in that both heads are movable, and inside the tubing before the AWG, and behind him, fixed on one cylinder with a spring-loaded piston, and the piston front of the cylinder, in the direction of flow, is connected by a rod with its movable front wall, and the piston of the rear cylinder is connected by a rod with its movable rear wall, the front cavity inside the front cylinder is connected with the internal volume of the tubing, and the cavity behind the piston is in communication with the annular space, and the rear cylinder still - the front cavity is connected with the internal volume of the tubing, and the cavity behind the piston is in communication with the annular space.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil producing industry and intended for improvement of oil recovery of the productive formations. The invention represents the method for wave field generation at the injector bottomhole with permanent rate of generation and adjustment of Helmholtz flow resonator for maintenance of fixed rate of pressure fluctuations in the liquid flow injected to the formation at changed formation pressure. The method lies in automatic adjustment of the flow section area for output opening in compliance with changes of formation pressure. It is required to maintain the permanent rate of the flow at the nozzle cut defining generation frequency to ensure a stable high amplification factor. The novelty lies in the unit in the output opening of Helmholtz flow resonator of the movable conical slide valve with hydraulic drive ensuring automatic movement of the valve at change in pressure drop at the device.

EFFECT: improved efficiency of permanent tone frequency maintenance at the opening.

3 cl, 1 dwg

FIELD: power industry.

SUBSTANCE: in the proposed method processing is performed in a circulating flow by hydrodynamic and ultrasonic cavitation action in cyclically repeated sequence consisting of two phases. A phase of hydrodynamic action involves mechanical destruction of liquid and (or) solid parts of components to the sizes that do not exceed the value of about 1 mm, and a phase of ultrasonic action involves ultrafine destruction of liquid and (or) solid particles of components, which are produced during the first destruction phase. Frequency of acoustic ultrasonic field fT is measured depending on temperature of processed multicomponent medium according to the following expression: fT=fN/(1+αΔT), where fN - resonance frequency of an ultrasonic emitter at normal temperature TN=25°C, ΔT -difference between actual values of temperature and TN, α - thermal expansion coefficient of material from which an ultrasonic emitter is made, and two-phase cyclic processing sequence of multicomponent medium is continued till more than 5% of suspended solid and/or liquid particles with a size of more than 25 mcm is left in it. The invention also describes a plant for implementation of the specified method.

EFFECT: method improvement.

2 cl, 1 dwg, 1 tbl

Pulsator // 2533600

FIELD: machine building.

SUBSTANCE: pulsator comprises a casing with sealed pulsation chambers 1, where motor-driven shafts 2 with discs rigidly fixed on them are mounted coaxially to the chambers. The casing consists of 4 vertically set cylindrical pulsation chambers 1 that are communicating and are symmetrically set on mutually perpendicular axes in plan view. The chambers 1 are connected pairwise by two parallel upper branch pipes and perpendicular to them - by two parallel lower branch pipes. The discs are installed at an angle to the shafts 2 in their central part so that their upper edge is below the upper branch pipe and the lower edge is above the lower branch pipe. External branch pipes 8 are mounted at the casing diagonals on the outer side of every chamber at half of their height.

EFFECT: increased efficiency of item washing.

4 cl, 5 dwg

FIELD: power industry.

SUBSTANCE: method of fluid flow vibration generation involves preliminary separation of fluid in main supply pipeline (11) to two flows outside of whirlpool chamber (1), inside which the flows are whirled by channels with different flow rates in opposite directions and separated by partition (4) with through channel (5). The flow is whirled by swirl channels (2) at large flow rate. Flow with smaller flow rate is whirled by swirl channels (3) of opposite orientation and linked through channel (9) with chamber of adjustable elasticity (8) closed by tight elastic shell (10) and installed in pipe (7) lengthwise. Due to elastic interaction, fluid in channel (9) obtains an impulse directed to whirlpool chamber (1), so that whirled flows are decelerated abruptly, and flow through output nozzle (6) rises significantly.

EFFECT: enhanced efficiency of constant fluid flow conversion to pulse flow due to reduced hydraulic loss and hydraulic energy consumed.

24 cl, 4 dwg

FIELD: machine building.

SUBSTANCE: liquid from a discharge manifold (5) is divided into two flows - main and additional ones. The value of flow rate in the main flow is maintained as more or equal to the value of the flow rate of the additional flow. The main flow is swirled with the help of swirling channels (3) in a flow chamber (2) with an outlet nozzle (4). A part of the main flow is released via a nozzle (4), and the other part is sent to an axial channel (8) made in the central body (7). The outlet (10) of the channel (8) is closed with an elastic partition (11). From the discharge manifold (5) via a distribution channel (13) the liquid is sent into an additional manifold (12). The manifold (12) is connected with a nozzle (4) via a gap (6) and with a channel (8) via a partition (11), with the help of which they provide for separation and elastic interaction of flows from the manifold (12) and the channel (8). As a result of which in the additional flow at first pressure growth is delayed, and then additional pulse action is provided due to forces of elasticity, with the help of which the main swirled flow in the chamber (2) is damaged, and short-term, pulse increase of liquid flow via the nozzle (4) is ensured.

EFFECT: invention makes it possible to expand functional and operational capabilities of an oscillation generator.

11 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: electrohydraulic vibrator includes a back-and-forth pump, suction and discharge hydraulic lines with valves of direct and return action, which are installed in them, a power hydraulic cylinder and an electromechanical converter. Electromechanical converter includes an electric motor, a multiplier, at the outlet shaft of which an eccentric cam mechanism is fixed, which contacts a plate-type pusher pressed with a return spring installed on a pump stock.

EFFECT: improving positioning accuracy at static and dynamic loads and maintaining linear dependence of amplitude of vibrations on the frequency specified with the electric motor; improving reliability and durability of electrohydraulic vibrator.

2 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: invention refers to automation devices of production process in various industries, and namely to distributing elements of hydraulic impact devices (HID) for control of working fluid flow between sections and units of the hydraulic system. HID distributor includes a housing with a control channel and channels for supply and discharge of working fluid, a control chamber and a shutoff control member. In the housing there is a calibrated throttle, through which restricted amount of working fluid has access from the control channel to the control chamber. HID distributor is equipped with a stepped valve for control of supply of working fluid to the control chamber, which is spring-loaded and interconnected through a throttle via a step of smaller diameter to the working fluid supply channel. In its initial position, the larger step of that valve closes the access of the working fluid to the control chamber.

EFFECT: improving operating reliability owing to damping the action on the shutoff control member in initial position of pressure pulse of hydraulic impact wave generated at supply to the distributor through the control channel of working fluid flow from a discharge line of HID at impact.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in intermittent feed of displacement fluid via two working ducts in common outlet manifold furnished with hydraulic cylinder with two pistons coupled by rod. Two openings are made in hydraulic cylinder wall to communicate with appropriate working duct. One piston is fitted inside hydraulic cylinder between said openings while another piston is arranged in outlet manifold. Compression and expansion waves are created in said outlet manifold by reciprocation of said pistons. Distribution of fluid flows between two working ducts is effected by feeding flat jet onto flat wedge arranged at definite distance from slot nozzle facing the flow. This invention differs from known designs in that pressure difference between working ducts is used to generate pressure pulses in outlet manifold.

EFFECT: optimised conversion of pressure difference in working ducts in that in outlet manifold.

3 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: drive comprises a double-acting piston-cylinder, the main control quadrilinear hydraulic distributor with hydraulic control, two control three-directional hydraulic distributors and additional start-up four-way two-position hydraulic distributor with hydraulic control. The spool of the hydraulic distributor is spring-loaded on the part of one of its ends by a spring with adjustable preload force. The output channel and spring chamber of the start-up control of the hydraulic distributor are connected to the drain hydraulic lines of the drive, the input channel and the hydraulic distributor control chamber, opposite to the spring chamber are connected to pressure hydraulic lines of the hydraulic power source, and each of the two executive channels is connected to a respective chamber of the working cylinder. In the initial position of the spool of the start-up hydraulic distributor all its channels are closed, and in the working position of the spool one of the executive control channels of the hydraulic distributor is connected to its input channel, and another executive channel is connected to the output channel of the hydraulic distributor.

EFFECT: increased reliability of starting operation of self-oscillatory hydraulic drive.

2 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: device for creation of pulse mode of loading actuating elements of process machines consists of case 1, of piston 2 with rod 3 and of generator of vibrations connected with cover 5. The generator of vibrations is installed in cartridge 8 coaxial to piston 2 and rod 3. The generator of vibrations is connected to membrane 9 rigidly set between cartridge 8 and cover 5.

EFFECT: expanded frequency and power range of dynamic loads, facilitation of operability at excess pressure and in vacuum at operation in reactors, pressure chambers and other vessels under pressure, elimination of dissipation of vibration energy created with generator of vibrations.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: well formation development device includes a swab, a tubing string with a swab limit stop and a filter for interaction with the formation and a packer installed above the formation. The tubing string above the packer, but below the swab limit stop is provided with a row of through holes. When in an initial position, the holes are tightly covered with a hollow sleeve for a discharge shutoff element. The shutoff element has a possibility of leak-proof fit and fixation in the hollow sleeve, as well as a possibility of restricted axial movement together with the hollow sleeve down against stop into an internal annular recess of the tubing string under action of created excess pressure in the tubing string with further fixation of the hollow sleeve with a spring-loaded split stop ring in notches for interaction of the inner space of the tubing string with the above-packer zone after discharge of the shutoff element. Notches are made on the inner surface of the tubing string. The shutoff element is made in the form of a stepped blind cylinder, the upper diameter (Ds) of which is larger than the inner diameter of the hollow sleeve (d), but is less than the inner diameter of the swab limit stop (D).

EFFECT: simpler design of the device and shorter development period of the well.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of a well bore zone treatment for a productive formation that includes running in of an in-series bottom-up mounted hydroimpulsive device and a jet pump at the pipe string to the well. Fluid is delivered to the hydroimpulsive device and this fluid is used for an impact on the well bore treatment zone with simultaneous pumping the fluid with colmatage particles by the jet pump to the surface. A depth gauge is mounted additionally at the tubing string in front of the hydroimpulsive device. At that a rotary hydraulic vibrator is used as the hydroimpulsive device to create a water jet and pulse-cavitating flow along the perforation interval. An impact on structures of the formation with fluid is made by the excitation of resonant oscillation of the fluid column in the well due to matching of the ripple frequency of the rotary hydraulic vibrator and own resonance frequency of the casing string with the fluid, placed below the rotary hydraulic vibrator and being a resonator of an organ pipe type. The required oscillation frequency f, Hz, is determined by the specified mathematical expression.

EFFECT: improved efficiency of performed surveys and treatment of the well bore zone of the formation with a combined water-jet effect on perforated openings or filters of the production casing and the pulse-cavitating flow to the formation structure with fluid and monitoring of the treatment parameters.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil producing industry and intended for improvement of oil recovery of the productive formations. The invention represents the method for wave field generation at the injector bottomhole with permanent rate of generation and adjustment of Helmholtz flow resonator for maintenance of fixed rate of pressure fluctuations in the liquid flow injected to the formation at changed formation pressure. The method lies in automatic adjustment of the flow section area for output opening in compliance with changes of formation pressure. It is required to maintain the permanent rate of the flow at the nozzle cut defining generation frequency to ensure a stable high amplification factor. The novelty lies in the unit in the output opening of Helmholtz flow resonator of the movable conical slide valve with hydraulic drive ensuring automatic movement of the valve at change in pressure drop at the device.

EFFECT: improved efficiency of permanent tone frequency maintenance at the opening.

3 cl, 1 dwg

Pig // 2540728

FIELD: machine building.

SUBSTANCE: pig has casing with central internal channel, through top and bottom side holes and check valve. This valve is equipped with central top stock, internal spring-loaded safety valve and through vertical holes in top end wall. Casing contains two coaxial bushings, top and bottom, and support section installed on the stock with possibility of rotation. At acute inclination angle to the central axis of the casing a between bushings ring clearance is made. Its peripheral edges are located on side surfaces of bushings. Top bushing is made with through inclined holes. They are connected with the clearance with possibility of creation of the hydraulic seal between the pig casing and pipe string during the pig movement. Bottom bushing is made with through side holes in top part. Facets of the ring clearance, top base of top bushing, cylindrical surface of each inclined hole of the top bushing are made interfaced. Besides, check valve installed in the support section with possibility of vertical movement is equipped by side contracting nozzles. They coincide with side through windows of the support section.

EFFECT: increased reliability of work and extension of process abilities of the pig.

2 cl, 3 dwg

Downhole pulsator // 2539087

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to devices used for formation simulation. Device for hydropercussion simulation of the formation included into the assembly of flow string comprises a hydraulic cylinder with crossover shoe, a plunger with radial openings, a spring-actuated pusher with circular bore and a ring piston. At that the hydraulic cylinder is fixed rigidly to a chamber with a landing ring installed in it and longitudinal grooves at its outer side. The pusher is equipped with outside protrusion, a saddle and a ball valve in the axial channel. The pusher lower end is passed to the axial channel of the landing ring and equipped with a locking ring interconnected with the pusher by a shear pin. The chamber axial channel is covered from below by a thrust ring and equipped with a hollow rod with the end valve pressed by a spring to the landing ring. At that in the end valve body there is a bore with a loose locking ring installed in it and the plunger is equipped with a ring piston thus forming an annular gap with the hydraulic cylinder coupled hydraulically to annular space by bypass ports.

EFFECT: improved efficiency of hydropercussion simulation of the formation.

4 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas production, particularly, to the recovery of the well permeability and can be used for the well repair. The proposed method comprises using the laser radiation to act on the well fluid at a power to develop plasma breakdowns in the fluid. Note here that, first, the laser pulse or intermittent radiation is used to generate the said breakdown and, thereafter, the frequency of an acoustic signal originating at the said breakdown is measured. Then, further effects in the pulse mode are used at the said frequency of the laser radiation.

EFFECT: profound effects on the well walls, higher permeability of the well (oil yield).

3 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-and-gas industry, in particular to devices intended for affecting the bottomhole formation zone by a depression pulse to up the well efficiency operated by sucker-rod downhole-pumping plants. The proposed device pulse-depression action on bottomhole formation zone comprises a hollow case with a guide and intake holes and a depression chamber extending therein. A cover is telescopically arranged at the said hollow case and locked by a shear screw. Note here that a variable-section rod is fitted concentrically in the said hollow case to connect the said depression chamber with an extra depression chamber. The said variable-section rod interacts with an overflow hole of the hollow case while a packer and wedge are arranged on the cover cylindrical surface. The wedge outer conical surface interacts with radially displacing slips. The cover is provided with a stop to interact with the wedge. The said hollow case rests of the well bottom. The cover cylindrical surface is provided with a radially displacing thrust ring and extra slips arranged under the slips and an extra wedge rigidly connected to the hollow case guide. The variable section rod bottom section has lateral holes and is provided with a plug at its bottom end section. The variable section hollow rod houses a plunger with a suction valve. The said plunger is connected via the rod string with the pumping unit. In an initial position, the hollow case overflow hole interacts with the hollow rod and isolates the hollow case intake holes from the hollow rod side holes. In the working position, the hollow case overflow hole gets out from the interaction with the hollow rod and communicates the hollow case intake holes with the variable section hollow rod side holes.

EFFECT: efficient cleaning of the bottomhole formation zone without multiple round trips.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil industry, and namely to pulse hydraulic hammer treatment of the bottomhole formation area, and well development. Essence of inventions: method includes stratum shutoff by a ring packer, pressure treatment of the bottomhole formation area by cyclic pulses of repression and depression pressure to the bottomhole formation area with pumping out of formation fluid. In order to create repression and depression pressure pulses the below-packer space is separated from the over-packer space. The time is provided for alignment of below-packer pressure with over-packer pressure. Pressure in the over-packer area without injection of working fluid from the surface is made higher for the purpose of direct hydroram or lower than the formation pressure for the purpose of return hydroram. The below-packer space is united with tubing string or below-packer space is united with over-packer space for the purpose of direct or return hydroram. Potential separation or interconnection of the below-packer space with over-packer space or with tubing string is ensured by use of a downhole assembly with a shell, a saddle installed on it and a ring packer, a piston with cross tee, which is moved in the shell by means of the tubing string and potential piston inlet/outlet from the well, a controlled piston valve at the lower butt end of the tubing string interacting with the shell saddle for the purpose of its opening and closing when the tubing string is moved with the piston.

EFFECT: improving efficiency and processability of the method and device due to increase in power and selectivity of hydraulic impact on the bottomhole formation area at simultaneous simplification of the device and method.

5 cl, 5 dwg

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used for development and recovery of flow rate of production wells, which was decreased as a result of colmatation of a well bore zone with asphalt-resin-paraffin formations and mechanical impurities. A treatment method of formation well bore zone involves lowering to the well of a pipe string, pumping to the well cavity of fluid; formation of depression pressure drop between the formation well bore zone and the well cavity by creating a pressure pulse in a perforation zone by means of a fluid source under pressure with further outflow of the well fluid to a discharge capacity. Pumping pressure and flow of pumped fluid is measured; with that, fluid is pumped with gradual pressure increase till opening of formation cracks and fluid pumping is stopped after increase of pumped fluid flow rate is stopped. The pipe string on the wellhead is provided from below with a packer, and from above with an ejector unit. The pipe string is lowered to the well so that the packer is located above the formation. The packer is installed; a hollow head piece is lowered via the pipe string and installed into the ejector unit. With that, the pipe string is isolated from interstring space of the well. After that, by means of the fluid source under pressure there pumped is fluid via the pipe string through the ejector unit to the under-packer space of the well cavity and to the formation with gradual pressure increase till opening of the formation cracks and till stop of flow rate increase of the fluid pumped to the formation. Then, the fluid source under pressure is isolated and well fluid is drained via the pipe string to the discharge capacity. After that, the hollow head piece is removed from the ejector unit via the pipe string, and a blind head piece is lowered to the ejector unit; with that, the pipe string is interconnected through the ejector unit with the well interstring space. Fluid is pumped from the wellhead via the pipe string to the ejector unit. Well fluid is transported under action of depression created on the formation from the under-packer space through the ejector unit via the interstring space to the discharge capacity. Fluid pumping to the pipe string is stopped after equalising of the fluid pumped to the pipe string.

EFFECT: improving treatment efficiency of a well bore zone.

2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used for increase in amount of pumped fluid, oil extraction factor, and decrease in sedimentation of natural hydrate and hydrate-hydrocarbon sediments on borehole equipment elements. Proposed method consists in incorporating the device with radiator and controlled electromagnetic wave field generator with electrically driven rotary pump downhole motor bed. Note here that irradiation of electromagnetic wave field is performed in resonance frequency of downhole space. Said frequency is defined during testing. Note here that testing is carried out at preset time intervals while during intervals between tests said generator is changed into downhole resonance frequency mode to allow the irradiator to generate standing electromagnetic waves along downhole space axis.

EFFECT: higher efficiency of extraction.

FIELD: oil and gas industry.

SUBSTANCE: rotary hydraulic vibrator includes a hollow body with spool installed coaxially to it. The body comprises an axial cylindrical channel with process openings in it matched by channels to the spool openings. The body is blinded from below. The spool is installed at the support coaxially to the body. In the axial cylindrical channel process openings are made by four openings in two rows, at that they are radial and mutually perpendicular in pairs. Spool openings matched to them and placed in the upper row are made radial, while the openings placed in the lower row and matched by a grove are offset tangentially. Jet nozzles are installed in the spool openings. Spool openings are made so that replaceable jet nozzles of different diameter and configuration may be set in them.

EFFECT: improved quality of cleanup for the reservoir perforated interval and increased permeability of rock within the well perforated interval due to provided effective parameters of impact and pulsed action at simplified design of the used equipment and reduced power requirement for the ground pumping equipment.

2 cl, 3 dwg

Up!