Method of well bore zone treatment for productive formation

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

 

The invention relates to the field of oil and gas industry and is intended to solve the problem of restoring the reservoir properties of the near-well zone of productive formations producing oil and gas wells and involvement in the development of difficult and uneconomic reserves of hydrocarbons, and can also be used for decolletage filters and prefiltered areas of hydrogeological wells.

A method of processing wellbore zone (RF patent No. 2255214), in which cleaning of the wellbore zone carry out a preliminary 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. Used the machine for washing the wells, which is connected to the annular space of the well and to pump-compressor pipe.

The implementation of this method is aimed at solving the task for cleaning the perforated interval (filter zone) wells from oil formations and solids.

This method allows to increase the turnaround time of the well due to better decolletee presque who Inna the zone.

However, when implementing a known method of processing wellbore zone, which consists in 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, nor are other forms of impact that improves the quality of cleaning of the perforated interval of the reservoir and increase the permeability of the rock structure of the reservoir fluid into the perforation interval.

The above drawbacks deprived of the selected prototype (patent RF №2222713), according to which the method of operation of the pump-ejector downhole pulse setup is that descend into the well on a string of pipe installed sequentially from the bottom up the shank, hydraulic-control device, a packer and a jet pump with a stepped through channel serves fluid in the hydraulic-control device and process of this environment in the mud pulse cavitation mode near-well zone of the reservoir followed by pumping using a jet pump of podvecerni zone of the well liquid medium together with clogging particles on the surface, when this pulse device performing teams and consisting of a stationary part, which is mounted on the string of pipe below the packer and which is made along the axis of the pipe string, the stepped pass channel emitted by parts, which is made in the form of an insert, before processing the near-well zone of the reservoir conduct geophysical studies of the productive formation in operating the well.

Really when implementing this method performs the task of extending the functionality of the method of installation and the effectiveness of research and processing of the near-well zone of the reservoir.

However, the method of pumping-ejector downhole pulse setup has a number of disadvantages.

Using this design of pump-ejector downhole pulse installation implementing the method of processing wellbore zone is not feasible in wells with a minimum diameter of casing production casing, because of the significant dimensions of the installation. Pumping-ejector downhole pulse set is intended for the treatment of contaminated wells, i.e., all contaminated passive medium passes through the mixing chamber and the diffuser of the jet pump and then moves along the production string of casing. The result of exploitation possible clogging of its flow area (cone, the mixing chamber, the inlet diameter in downhole conditions for these structures is in the order of 8 mm) mechanical impurities. Mechanically the impurities can also be abrasive in nature (particles of corrosion products of metal, the elements of the formation, the proppant), which leads to wear the flowing elements jet pump casing and the production string. In the construction of the jet pump no replacement parts to control the main parameters of the jet pumps: coefficient of ejection and the relative dimensionless pressure drop, and replacement due to abrasive and erosive wear.

Object of the invention is to enhance the functionality of existing methods of treatment of the near-well zone of the reservoir while simplifying the structure of the equipment used, the miniaturization of functional devices and reducing the intensity of ground pumping equipment.

The technical result of the invention is to improve the effectiveness of research and treatment of wellbore zone with a combination of influences giant effect on perforation holes or filters of the production string and pulse-cavitation expiration on the structure of the reservoir fluid with the control of the processing parameters.

This technical result is achieved due to the fact that in the processing method of the near-well zone of the reservoir, namely, that descend into the well on a string of pipe installed sequentially SN the zu up pulse device, the jet pump serving liquid medium in the hydraulic-control device and impact of this environment on the near-well zone of the reservoir with simultaneous pumping with jet pump liquid medium together with clogging particles on the surface, an additional string of tubing before mud pulse device has a depth gauge, and as a mud-pulse device uses a rotary hydraulic vibrator to create monitor and pulse-cavitation expiration along the perforation interval, the impact on the structure of the reservoir fluid is carried out by excitation of resonant oscillation of the liquid column in the well due to the coincidence frequency ripple rotary hydraulic vibrator and self-resonant frequency of the casing with fluid below the rotary hydraulic vibrator and which resonator type "organ pipe", with the desired oscillation frequency f, Hz, is determined by the formula:

where ν is the speed of sound in the medium, m/s;

L is the length of the casing below the rotary hydraulic vibrator, m

The jet pump and rotary hydraulic vibrator is arranged to move across the perforated interval of the well.

The analysis conducted in the borehole works for research and treatment of the near-well zone of the reservoir showed that effective is the combination of wet and pulsed cavitational mode simultaneous impact. This work should be carried out when performing the reciprocating motion of the source monitor and pulse-cavitation effects along the perforated interval, in order to completely remove kolmat interlayers with the perforated interval of the well, as well as work on near-well zone of the reservoir, namely, the structure of the reservoir with fluid.

Depending on the results of field geophysical research, and determine the composition and structure of the deposits, overlying near-well zone of the reservoir, the proposed method can simultaneously monitor mode and pulsed cavitational processing and handling solutions, acids, surfactants and other

The invention is illustrated by the drawing, which shows a diagram of an installation for implementing the method of processing the near-well zone of the reservoir.

Installation for implementing the method of processing the near-well zone of the reservoir contains mounted on the outer string of tubing 1 bottom-up depth gauge 3 with the unit continuously the recording downhole pressure, hydraulic-control device - a rotary hydraulic vibrator with 5 interchangeable jet nozzles 4, the jet pump with 2 interchangeable plug-in active nozzle 6 and a removable plug-in mixing chamber 7, which is associated with the inner casing tubing tubing 8.

The processing of the near-well zone of the reservoir is as follows.

According to the results of geophysical surveys to determine the composition and structure of the deposits on the perforation interval of the wells. On the jet pump 2 install the necessary size of the active nozzle 4 and insert the mixing chamber 7 to implement the required values repression-depression. Depending on your spending characteristics of the surface pumping equipment choose the diameter of the plug jetting nozzles nozzles 4 on a rotary hydraulic vibrator 5.

Device to implement a method of processing the near-well zone of the reservoir is lowered into the well on the exterior of tubing pipes 1 and set so that the pulse device - rotary hydraulic vibrator 5 was directly at the starting point of the perforated interval of the formation.

Based on distance from the starting point of the perforated interval to the borehole bottom (as determined by the passport scaini) and type of fluid is allocated its own resonance frequency of the casing with the fluid f, Hz, according to the formula:

where ν is the speed of sound in the medium, m/s;

L is the length of the casing below the mud-pulse device-rotary hydraulic vibrator 5.

One of the problems in the implementation of the invention is the creation of using mud-pulse device - rotary hydraulic vibrator 5 pulses with a frequency equal to the resonance frequency of the casing with fluid below the rotary hydraulic vibrator 5, which is a resonator type "organ pipe". When the frequency of the ripple formation patterns can be excited into resonance, which contributes to better, faster and more effective cleaning of the bottom zone, the increased permeability of rocks of the productive formation.

The frequency of the pulses generated by pulse device-rotary hydraulic vibrator 5, is adjusted by changing the configuration and diameter of the jetting nasdaw 4, and the change in the flow rate of the working fluid ground pumping equipment. With increased flow increases the pressure drop and increases the frequency of rotation of the spool relative to the housing of the rotary hydraulic vibrator 5 and increases the speed of opening and overlapping holes which have hydroman the Torno nozzle 4.

For rotary hydraulic vibrator 5, which is intended for lowering the casing production casing diameter of 114 mm, you can change the pulse frequency in the range from 10 to 150 Hz at a flow rate of the working fluid 0.5 to 1.25 l/s and pressure drop of from 4 to 40 MPa.

The liquid medium is fed through the channel for supplying an active flow jet pump 2 on a rotating hydraulic vibrator 5. The liquid medium flowing from removable jetting nasdaw 4, and starts the processing of the reservoir, which aims to resolutely (cleaning and flushing of sediments) of the perforated interval of the wells, and also the influence of the pulse frequency of from 10 to 150 Hz on the reservoir.

Deposits are dissolved and mixed with the liquid medium, is formed passive stream.

Part of the flow of the working fluid is supplied to plug the active nozzle 6 jet pump 2, creating a zone of reduced pressure relative to the holes of perforated layer well.

All passive stream pollution from the perforated interval of the well is fond plug in the mixing chamber 7 of the jet pump 2, in which active and passive streams are mixed and then the flow inside the tubing string 8 is directed at the wellhead.

During processing device (the jet pump 2 and a rotary hydraulic shaking the ATOR 5) for the implementation of this method moves the reciprocating across the perforated interval of the well by changing the length of the exterior columns of tubing 1 and the internal length of the column tubing pipe 8 by means of ground-based equipment for tripping.

If the destruction of the sediments overlying the near-wellbore area of the formation of the necessary processing acids, alkali, surfactants and others, as a liquid environment using chemical reagents.

After rotary hydraulic vibrator 5 is mounted depth gauge 3 with block continuous recording of downhole pressure. After processing wellbore zone, measured values of flow rate and bottomhole pressure at different modes and build the indicator diagram wells, which define the boundary of the field of rational life of the well.

Thus, the perforation interval of oil, gas, injection wells or filter zone artesian well is subjected to simultaneous processing giant impact and impulse-cavitation expiration, which contributes to the intensification of liquid filtration and provides removal of the bottom-hole zone of clogging material. Resulting purified natural pore channels and increases water permeability. The hydraulic energy of elastic oscillations is transferred into the reservoir, this reservoir structure can be excited into resonance by coincidence frequency ripple rotary hydraulic in which bratara 5 and resonance frequency of the casing with fluid, below the rotary hydraulic vibrator 5, which is a resonator type "organ pipe", which contributes to better, faster and more effective cleaning of the bottom zone, the increased permeability of rocks

The work described device for implementing the method is similar to the work known. However, due to the proposed technical and technological solutions will expand the scope of their use in wells with a diameter of casing production casing from 114 mm to improve the processing efficiency of the productive strata wells, simplify maintenance and increase the endurance of the device

1. The processing method of the near-well zone of the reservoir, namely, that descend into the well on a string of pipe installed sequentially from the bottom up pulse device, the jet pump, serves liquid medium in the hydraulic-control device and impact of this environment on the near-well zone of the reservoir with simultaneous pumping with jet pump liquid medium together with clogging particles on a surface, characterized in that an additional column tubing before mud pulse device has a depth gauge, and as a mud-pulse device uses a rotary guy who replicase vibrator to create monitor and pulse-cavitation expiration along the perforation interval, the impact on the structure of the reservoir fluid is carried out by excitation of resonant oscillation of the liquid column in the well due to the coincidence frequency ripple rotary hydraulic vibrator and self-resonant frequency of the casing with fluid below the rotary hydraulic vibrator and which resonator type "organ pipe", with the desired oscillation frequency f, Hz, is determined by the formula:
f=ν4L,
where ν is the speed of sound in the medium, m/s;
L is the length of the casing below the rotary hydraulic vibrator, m

2. The method according to p. 1, wherein the jet pump and rotary hydraulic vibrator is arranged to move across the perforated interval of the well.



 

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FIELD: mining.

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FIELD: oil-and-gas industry.

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EFFECT: higher efficiency of extraction.

FIELD: oil-and-gas industry.

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EFFECT: simplified design, higher reliability and quality.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: at the wellhead a flush-joint pipe of coil tubing, which is used as a lower end of the pipe string, is equipped at first with a valve consisting of a saddle and case with openings covered hermetically by the saddle fixed by a shear pin in regard to the case and then with a liquid pulsator with a nozzle at the end. The pipe string is run in till the nozzle of the liquid pulsator rests at the bottomhole of a horizontal well, the pipe string is filled with acid solution and acid solution is injected in pulsed mode under pressure of 18 MPa at most with simultaneous movement of the pipe string from the bottomhole to the wellhead with the rate of 50 m per minute to the length of horizontal well screen. When the design distance is reached movement of the pipe string and injection of acid solution is stopped, the plug is placed to the pipe string at the wellhead, movement of the pipe string is renewed and the plug is flushed by process liquid. At that at the moment when the pulsator reaches the screen end interval close to the wellhead the plus is placed to the valve saddle and in result hydraulic pressure increases in the pipe string and the shear pin gets broken. Moreover the saddle moved downwards and openings in the valve case get open thus interconnecting inner space of the pipe string and tubular annulus of the horizontal well. The plug cuts off the liquid pulsator hermetically. Then the process is withhold during 1 hour, at that in process of this withhold the pipe string is run in until the liquid pulsator rests in the bottomhole of a horizontal well. Then, during three cycles in sequence, 0.5 m3 of process liquid is injected either to the pipe string or tubing-casing annulus in turn. When withhold time is over reaction products are washed out by return circulation in one and a halve volume of the well.

EFFECT: improving treatment efficiency of a bore-hole zone.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: well completion method involves pumping of an acid solution by circulation with a well mouth by means of a jet nozzle arranged on the end of a flexible flush-joint pipe. Simultaneously with circulation of the acid solution, the flexible flush-joint pipe is being lifted out of the well at a speed that is not higher than the speed of filling the well shaft with an acid solution. After the horizontal shaft is filled with the acid solution, squeezing of the acid solution to the formation is performed at stepped pressure rise and exposure at each step. Process exposure is performed for a reaction of the acid solution with the rock, and inert gas pumping, fixing of a level recovery curve, well killing and well development is performed. First, a tubing string with starting clutches and with a funnel on the end is lowered into the well at the interval of the shoe of the production casing. The flexible flush-joint pipe with a jet nozzle is lowered inside the tubing. Before the acid is pumped to the formation, the horizontal shaft of the well at an open annular space is filled through the flexible flush-joint pipe with a water solution of a surface active substance (SAS). When the annular space is closed, the water solution of SAS is pumped to the formation. Process exposure is performed before oil floats up into the well. Then, the acid solution is pumped via the annular space. Process exposure is performed for 2-4 hours for the reaction of the acid solution with the rock. The well shaft is flushed. The flexible flush-joint pipe with the jet nozzle is lifted out of the well. Inert gas pumping is performed via the annular space with liquid take-off via the tubing.

EFFECT: improving efficiency of acid treatment of a well.

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