RU2015317C1 - Device for inducing inflow of formation fluid - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: device is installed on tubing 1 and has body 2, jet pump and check valve. Body 2 is hollow structure in which channels are accommodated. Jet pump has sleeve 5 with recording instrument unit 6 to which end piece 7 with load-carrying logging cable 8, jet 9, mixing chamber 10, diffuser 11 and port are connected. Jet pump is lowered in body 2 on landing seat and tightness is ensured by seals 12. During operation jet pump is held by stops 18 and links 19 remove jet pump from stops. Check valve includes rod, spring and bushing to which instruments are connected such as bottom-hole pressure gage, thermometer, etc. There are holes and channels to equalize pressure in zones under and above packer when lifting jet pump. EFFECT: reduced terms of well completion, intensified oil and gas inflows, possibility of repeated exposure of formations by perforators run on cable through offered device. 4 dwg

Description

 The invention relates to the oil and gas industry and can be used for well development and stimulation of oil and gas inflows.

 A device for pumping fluid from a reservoir, comprising a housing with holes and a seat, a plug-in jet pump, a cross current coupling, a seat seat in the form of a spring-loaded sleeve, a check valve and a packer [1].

 The disadvantage of this device is the lack of instruments for conducting hydrodynamic studies when calling tributaries in the process of well development.

 A device for hydrodynamic research of the formation, including a hollow body with radial channels connected to the pipe string, an insertion jet pump installed in the body, a spring-loaded seat with a check valve to close the body cavity, a packer, a sleeve with a device block on the cable [2].

 The disadvantage of this device is that the diametrical size of the seat under the check valve does not allow the perforator to be lowered through the cable through the hollow body, as a result of which it is necessary to lift the entire device together with the pipe string to open the reservoir, which leads to an increase in the time spent on work .

 The purpose of the invention is the provision of opening the reservoir by perforators, lowered on the cable, without lifting the string of pipes on which the body of the device is mounted.

 To this end, in a device for inducing formation fluid inflow containing a hollow housing with radial channels connected to the pipe string, an insertion jet pump installed in the housing with a recording instrument unit, a check valve for closing the housing cavity and a packer, the check valve is located in the floor connected to the pipe string housing under the jet pump and made in the form of a spring-loaded piston, the input channel of the jet pump is combined with the radial channels of the hollow body, while on the sleeve of the block of recording devices made but the locking device consisting of rods and stops.

 In FIG. 1 and 2 depict a device for intensification of tributaries; in FIG. 3 is a section AA in FIG. 1; in FIG. 4 is a schematic diagram of the operation of the device.

 A device for causing inflow of formation fluid (Fig. 1) is installed on the tubing 1 and includes a housing 2, a jet pump 3 and a check valve 4.

 Case 2 has a hollow structure, in the body of which are channels B, C, D, D.

 The jet pump 3 includes a sleeve 5 with a block of recording devices 6, to which a cable lug 7 with a load-carrying logging cable 8, a nozzle 9, a displacement chamber 10, a diffuser 11 and a window G are attached through a connector. There is a landing slot for landing the jet pump 3 in the housing 2 And, and the seals provide tightness 12. The jet pump 3 is held in the housing 2 due to the stops 18, which engage with the recess K, and the removal from the stops is carried out using rods 19, which can be cable. The non-return valve 4 includes a stem 13, a spring 14, which is attached to the stem and a non-return valve and a sleeve 15 for connecting measuring devices (depth gauge, thermometer, flow meter, etc.), while there are holes 3 on the body of the non-return valve, and a channel at the sleeve L, which serve to equalize the pressure in the sub-packer and packer areas when lifting the jet pump 3 from the well.

 The device operates as follows.

 The housing 2 without the jet pump 3 is lowered into the production casing 16 (Fig. 3) on the tubing 1 together with the packer 17 and is installed at the calculated depth. After separation of the annulus by the packer 17 and checking the tightness of the packer and tubing string with a pressure 1.5 times higher than the calculated working pressure, a crimping valve is released on the well cable, which closes the radial holes in the housing 2. In the absence of fluid circulation at the mouth, the tightness of the packer and Tubing.

 After checking the tightness of the packer and tubing, the crimping valve rises to the surface and the jet pump 3 with the non-return valve 4 is lowered into the housing 2 of the device on the load-carrying logging cable 8. The load-carrying logging cable is sealed at the wellhead using a lubricator.

 By creating pressure in the tubing, the jet pump 3 is planted in the seat And, while the stops 18, under their own weight, fix the jet pump in the recess K of the housing 2.

 Using ground-based pumping units, the working fluid is fed into the inner annular cavity between the production casing and tubing to the slender pump. The movement of fluid in the device is shown by arrows (Fig. 3), it passes through channels B, nozzle 9, displacement chamber 10, diffuser 11, window G, channels into the internal cavity of the tubing and from there to the wellhead. Flowing out at high speed from the nozzle 9, the fluid ejects formation fluid from the sub-packer zone, which enters the mixing chamber 10 through the channels B of the casing 2, where the working and ejected fluids are mixed. The mixed stream enters the diffuser and from there through the tubing to the surface.

 When the jet pump 3 is operating, the non-return valve 4 is in the upper position due to the pressure difference in the under-packer area and the over-packer space so that a gap appears between the valve 4 and the body 2. Upon termination of the operation of the pumping units under the action of the spring 14 and the pressure of the hydrostatic liquid column, the check valve 4 returns to its original position, sealing the under-packer zone. The pressure in the sub-packer zone is gradually restored due to the inflow from the reservoir. This pressure change through the channel D in the body of the body 2 is transmitted to the pressure transducer of the block of recording devices 6. From this moment, the pressure recovery curves are recorded on the logging station photorecorder, and the signal goes through the load-carrying logging cable 8.

 The process of reservoir research by calling the inflow and recording the pressure recovery curves can be repeated many times until the required information on the hydrodynamic characteristics of the productive formations is obtained.

 At the end of the research work with the help of a load-carrying logging cable, it is tensioned, while the cable rods 19 remove the stops 18 from the fixation. The jet pump 3 begins to rise and the rod 13 of the check valve 4 also rises and connects the channel L to the holes 3, the above-packer and under-packer zones are communicated, the pressure is equalized in them and the jet pump is transported to the surface.

 In the absence of inflow during cyclic impact on the reservoir, work is underway to intensify the inflow or re-perforation of the reservoir. In this case, perforators on the cable are lowered into the well through the hollow body 2 of the device. After opening and processing the productive formation, the jet pump again descends and the near-stem zone of the formation is cleaned of perforation products, drilling fluid and cement filtrate.

 Using the proposed device in comparison with the prototype will significantly reduce the time for well development and stimulation of oil and gas inflows due to the proposed reverse circuit of the working fluid circulation during the operation of the jet pump, and the possibility of re-opening the formations with perforators that are lowered on the cable through this device reduces the negative effect of the washing filtrate fluid to the near-stem zone of the seams, which significantly affects the increase in well productivity, as well as after opening the different treatments of productive strata are not required to carry out tripping situ equipment.

 These advantages of the proposed device expand its operational capabilities.

Claims (1)

 DEVICE FOR CALLING PLASTIC FLUID FLOW, containing a hollow body with radial channels made therein, connected to a pipe string, an insertion jet pump installed in a body cavity with a recording instrument unit, a check valve and a packer, characterized in that it is equipped with a latch including stops and thrust placed on the block of recording devices, the check valve is made in the form of a spring-loaded piston and placed in the cavity of the housing under the jet pump, and the input channel of the latter is combined with rad TV-trivial hollow body.

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