Method of downhole jet unit when hydrodynamic effects on the near-wellbore area of the formation

 

The invention relates to a downhole jet pump installations for oil extraction. Method of operation when the hydrodynamic effects on the near-wellbore zone (PZ) of the productive formation (PP) is that descend into the well installed on the column pump compressori pipe liner, packer and a jet pump (SN). Packer and SN is set on the roof of PP and produce raspaculo packer. Using the pumping unit to periodically submit a working agent in the nozzle SN, and the work of CH carried out in the following mode: sharply serves the working agent (RA) in the nozzle SN at a given pressure pump unit and within a few seconds to create the desired depression on the PP. Support the effect of this depression on the PP for 2 to 20 min by constant feeding of RA in the nozzle SN at a given pressure pump unit, then abruptly restore the hydrostatic pressure of the liquid column in the well due to its flow in podvecerni space and organize hammer, directed towards PP, and failure to place particles altamonte by abrupt cessation of RA in the nozzle CH. Set the pressure of the liquid column more reservoir pressure. Time steps off the Hydra is ova sharply in the nozzle SN serves RA and repeat the above cycle. The number of cycles "depression + repair hydrostatic pressure determined by the degree of recovery of permeability PZ layer by carrying out control measurements of the flow rate before and during cyclical impact on PZ. If the last two control measuring the well productivity has not increased, then stop. The invention is aimed at improving reliability and performance. 4 C.p. f-crystals, 1 Il.

The invention relates to the field of pumping machinery, mainly to well pumping units for oil extraction from wells.

The known method of operation of jet borehole installation, including the supply of the column pump compressing pipes active fluid in the nozzle of the jet apparatus, enthusiasm passive medium and mixing it with the feed mixture of environments from the well to the surface (see, SU 1668646 A1, E 21 In 43/27, 07.08.1991).

This method of downhole jet unit allows pumping from wells produced various environments, such as oil with simultaneous processing of the extracted environment and the near-well zone of the reservoir, however, the absence of this type of stimulation modes on presaging the area of the square is the technical essence and the achieved result is a method of downhole jet unit when exposed to near-well zone of the reservoir, including installation in the well on the tubing pipe jet pump, the flow through the column pipe in the nozzle of the jet pump of the working environment and creating due to this, in podvecerni zone adjustable pressure with the possibility of drainage layer (see patent RU 2176336 C1, class F 04 F 5/02, 27.11.2001).

This method of downhole jet unit allows the well below the level of the installation of the jet pump, the layer processing, including the creation of a pressure differential above and below the sealing site. However, this method does not allow full use of the possibilities of the downhole jet unit, which is connected with the insufficient depth of the depression and a long recovery time pressure, especially in low permeability of the near-well zone of the reservoir.

Task to be solved by the present invention is directed, is to increase the reliability and performance when processing the productive formation and thus increase flow rates upstream and injectivity of injection wells due to the recovery of permeability wellbore zone.

This problem is solved due to the fact that the way the collaboration is that lowered into the borehole installed on the tubing pipe liner, packer and a jet pump, installing a packer and a jet pump above the roof of the productive formation and produce raspaculo packer, and then using a pump unit periodically serves the working agent in the nozzle of the jet pump (e.g., water or oil), and the operation of jet pump carried out in the following mode: sharply serves the working agent in the nozzle of the jet pump at a given pressure pump Assembly (RA) and within a few seconds to create the desired depression in the reservoir (P), supporting the validity of this depression on the layer in the course of from 2 to 20 min (d) by a constant supply of working agent in the nozzle of the jet pump at a given pressure pump unit, then abruptly restore the hydrostatic pressure of the liquid column in the well (WG), due to its flow through the diffuser and the channel for supplying the pumped fluid in podvecerni space and organize hammer, aimed in the direction of the reservoir, and the failure to place particles altamonte who are stuck in the pore channels producing pump, this sets the pressure of the liquid column (WG) is greater than the formation pressure (RPL), set the time steps in the near-wellbore zone of the reservoir hydrostatic pressure of the liquid column (g) not less than 2 times less than the time of the depression, and then again sharply served in the nozzle of the jet pump working agent and repeat the above cycle impacts on the near-well zone of the reservoir depression and hydrostatic pressure of the liquid column, and the number of cycles "depression + repair hydrostatic pressure determined by the degree of recovery of the permeability of the near-well zone of the reservoir through periodic control measurements of the flow rate before and during cyclic effects on the near-well zone of the reservoir, if the last two control measuring the well productivity has not increased, then ceased.

The most optimal time control measurement (K) ranges from 20 min to 1 h, control measurements, it is advisable to carry out every 10-30 cycles "depression + repair hydrostation before and after hydrodynamic effects on the near-well zone of the reservoir to conduct a study of the flow profile and composition coming from productive fee fluid using integrated geophysical instrument, descent on wireline in the zone of the reservoir through the jet pump, and hydrodynamic studies in steady and unsteady modes using special function inserts installed in the flow channel of the pump. In reservoirs with a high degree of contamination of the near-wellbore zone in conjunction with hydrodynamic effects, it is advisable to carry out the effect of acoustic fields of different frequencies and intensities using ultrasound emitter, turn on wireline through the jet pump in the zone of the reservoir. In some cases it is advisable after hydrodynamic effects on the near-well zone of the reservoir to carry out the acid treatment by injection of acid into the reservoir through the jet pump, and then again to repeat hydrodynamic effects.

Analysis of downhole jet unit showed that the reliability and efficiency of the installation can be improved by optimizing the sequence of actions when cleaning wellbore zone in wells.

It was found that the above procedure allows for the most efficient use of borehole streinu oductive formation by increasing the permeability of non-performing and poorly performing interlayers of the productive formation. By carrying out control measurements both before and during treatment can first assess the technical condition of the well, the properties of the fluid, which is produced from a well, the condition of the near-well zone of the reservoir and to select a processing mode of the productive formation. The results of the study of the flow seems to be able to assess the quality of processing of the near-well zone of the reservoir and to choose the mode of operation of the well. Alternating hydrodynamic effects on the layer with the formation of a hydraulic shock can increase the radius and handling wellbore zone. When you created the depression of the jet pump in a timely manner removes from the reservoir clogging the reservoir clogging particles, which annular space the tubing with high speed brought to the surface. The combination of an adjustable described above, the step of alternating pumping mode by changing the pressure of the liquid working medium supplied to the nozzle of the jet pump allows you to choose a mode of operation in which not only restores the permeability hasn't worked interlayers, but raises different layers of the reservoir. It was identified that is essential for effective stimulation are abrupt transition from depression to the reservoir to restore hydrostatic pressure with a cyclic repetition of this operation and the time of maintaining depression on a layer in comparison with the time of hydrostatic pressure on the formation of a column of fluid in the well is not less than 2 times, and the time of the depression should be from 2 to 20 minutes Also revealed that the number of these cycles hydrodynamic effects on the producing formation may be determined by the results of control measurements that determined the possibility of achieving high-quality cleaning wellbore zone and timely termination. Thus this method works effectively to carry out measures for the intensification of production of the well, while the research and testing of wells in different modes. The result was 1.5-2 times increase of the ratio of the current thickness of the layer through the fracture zone sedimentation in idle interlayers of the productive formation and, as a consequence, 1.2-1.6 times to speed up the work on improving well productivity, and substantially Firawn the thickness. It should be noted that described in the invention procedure allows you to constantly monitor the progress of stimulation produced from the reservoir environment. In particular, the data control measurements allow to obtain an objective picture of the near-well zone of the reservoir depending on the carried out works to improve its permeability.

Thus, achieved the task - improving the reliability and performance when processing the near-well zone of the reservoir.

The drawing shows a longitudinal section of a downhole jet unit for implementing the described method. Downhole jet unit contains mounted on the column pipe 1 bottom-up input hopper 2 with the shank 3, the packer 4 made it the Central channel 5 and the jet pump 6, block 7 which has an active nozzle 8 and the mixing chamber with a diffuser 9, and made a channel for supplying a working agent 10, channel 11 for supplying the pumped out of the well bore fluid and the stepped pass channel 12 with a mounting seat 13 between steps. In the stepped pass channel 12 predusmotret above 15 tip 16 for connecting the receiver-transducer of physical fields 17. The output of the jet pump 6 is connected to the annular space of the well pipe string, 1). The nozzle 8 jet pump 6 through the channel for supplying a working agent 10 is connected to the inner cavity of the pipe string 1 above sealing of the node 14 and the channel 11 for supplying a pumped from the well fluid is connected to the inner cavity of the pipe string 1 below the sealing of the node 14.

Method of downhole jet unit when exposed to the near-wellbore area of the formation is that descend into the well installed on the column pump compressori pipe 1 funnel 2 with the shank 3, the packer 4 and the jet pump 6. Set the packer 4 and the jet pump 6 above the roof of the productive layer 18 and produce raspaculo packer 4. Then using a pump unit (not shown) periodically submit the working agent into the nozzle 8 jet pump 6 (for example, water or oil), and the operation of jet pump 6 is carried out in the following mode: sharply serves the working agent into the nozzle 8 jet pump 6 at a given pressure pump Assembly (RA) and within a few seconds to create the desired depression in the reservoir 18 (P=RPL-RZ, where RZ is the bottomhole pressure and RPL - reservoir pressure). By Kee is t the effect of this depression in the reservoir 18 for 2 to 20 min (d). Then abruptly stop the flow of the working agent into the nozzle 8 of the jet pump 6, which leads to abrupt restoration of the hydrostatic pressure of the liquid column in the well (WG), due to its flow through the diffuser 9 and channel 11 for supplying the pumped fluid in podvecerni space. This sets the pressure of the liquid column (WG) is greater than the formation pressure (RPL), and thus organize hammer, directed towards the productive formation 18 (R=WG-CL, whereR - value repression on the formation of the working fluid), and failure to place particles altamonte who are stuck in the pore channels of the productive layer 18 during movement in the direction of the well. The time steps for the near-wellbore zone of the reservoir 18 of the hydrostatic pressure of the liquid column (g) not less than 2 times less than the time of depression. Then again sharply served in the nozzle 8 jet pump 6 working agent and repeat the above cycle impacts on the near-well zone of the reservoir 18 of the depression and the hydrostatic pressure of the liquid column, and the number of cycles "depression + reset roductive reservoir 18 through periodic control measurements of the flow rate before and during cyclic effects on the near-well zone of the reservoir 18. If the last two control measuring the well productivity has not increased, then ceased.

If there is a need for additional examination of wells is provided by the possibility of placing in the borehole below the jet pump 6 receiver-transducer of physical fields 17. For this purpose, sealing the node 14 movably placed on the well-logging cable or wire 15 above tip 16 for connection of integrated geophysical instrument, for example, receiver-transducer of physical fields 17 or functional insert (not shown) for hydrodynamic studies of the formation in unsteady mode.

If there is a need for a comprehensive impact on the near-wellbore area of the formation, on a wireline into the borehole together with a sealing node 14 down the ultrasound emitter and possible injection into the reservoir of acid solution through the jet pump 6, which allows in combination with the hydrodynamic effects enhance the impact on the reservoir 18.

The present invention can be used in the oil and gas industry for well development after drilling or servicing the gn:center; margin-top:2mm;">Claims

1. Method of downhole jet unit when hydrodynamic effects on the near-well zone of the reservoir, namely, that descend into the well installed on the column pump compressori pipe liner, packer and a jet pump, installing a packer and a jet pump above the roof of the productive formation and produce raspaculo packer, and then using a pump unit periodically serves the working agent in the nozzle of the jet pump (e.g., water or oil), and the operation of jet pump carried out in the following mode: sharply serves the working agent in the nozzle of the jet pump at a given pressure pump unit (RA) and within a few seconds to create the desired depression in the reservoir (R) support the effect of this depression on the layer in the course of from 2 to 20 min (d) by a constant supply of working agent in the nozzle of the jet pump at a given pressure pump unit, then abruptly restore the hydrostatic pressure of the liquid column in the well (WG), due to its flow through the diffuser and the channel for supplying the pumped fluid in poastic of Altamont, trapped in the pore channels of the productive formation when moving towards the hole by the abrupt cessation of the working agent in the nozzle of the jet pump, while the set pressure of the liquid column (WG) is greater than the formation pressure (RPL), set the time steps in the near-wellbore zone of the reservoir hydrostatic pressure of the liquid column (DTG) not less than 2 times less than the time of the depression, and then again sharply served in the nozzle of the jet pump working agent and repeat the above cycle impacts on the near-well zone of the reservoir depression and hydrostatic pressure of the liquid column, moreover, the number of cycles “depression + repair hydrostatic pressure determined by the degree of recovery of the permeability of the near-well zone of the reservoir through periodic control measurements of the flow rate before and during cyclic effects on the near-well zone of the reservoir, if the last two control measuring the well productivity has not increased, then ceased.

2. Way p. 1, wherein the time control measurement

4. Way p. 1, characterized in that the layers with a high degree of contamination of the near-wellbore zone in conjunction with the hydrodynamic impact of the spending impact of acoustic fields of different frequencies and intensities using ultrasound emitter descent on wireline through the jet pump in the zone of the reservoir.

5. Way p. 1, characterized in that after the hydrodynamic effects on the near-well zone of the reservoir carry out the acid treatment by injection of acid into the reservoir through the jet pump, and then repeat again hydrodynamic effects.

 

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FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

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