RU2213276C1 - Well jet pumping unit for testing and completion of horizontal wells - Google Patents

Abstract

FIELD: well jet pumping units. SUBSTANCE: well jet pumping unit has packer, jet pump with step passage channel, sealing unit, logging cable and changeable functional inserts: pressure differential, blocking and insert for recording of curves of formation pressure recovery in well under-packer space. Installed under jet pump in tubing is device with step passage channel for installation of insert for recording of curves of formation pressure recovery in well under-packer space. Installed under insert for recording of said curves is instrument for recording of bottomhole pressure and parameters of formation fluid, or instrument for transmission of said information to surface. Length of insert for recording of said curves is larger than tubing inner diameter. Diameter of jet pump passage channel above landing place is, smaller than inner diameter of tubing, at least by 1 mm, and is larger than diameter of lower step of jet pump passage channel, at least, by 0.5 mm. Diameter of lower step of jet pump passage channel is larger than diameter of upper step of passage channel of device for installation of insert for recording of said curves by, at least, 0.8 mm, and larger than diameter of lower step passage channel by, at least, 1.8 mm. Diameter of insert for recording of said curves is smaller than lower step of jet pump passage channel by, at least, 0.5 mm. EFFECT: optimized dimensions of well jet pumping unit, higher its operate reliability and output. 2 dwg

Description

 The invention relates to the field of pumping technology, mainly to downhole pumping units for oil production from wells.

 A well-known jet installation including a jet pump installed in a well on a tubing string and a geophysical device located below the jet pump in a tubing string (see RU 2059891 C1, F 04 F 5/02, 05/10/1996).

 This downhole jet installation allows pumping out various produced media, such as oil, from the well while processing the produced medium and the near-wellbore zone of the formation, however, this installation provides for the supply of the working medium to the nozzle of the jet apparatus through a pipe string, which in some cases narrows the scope of this installation.

 The closest to the invention in technical essence and the achieved result is a downhole jet installation comprising a packer, a pipe string and a jet pump, in the housing of which an active nozzle with a mixing chamber is installed and a passage through is made with a seat for installing a sealing unit with an axial channel, the outlet of the jet pump is connected to the pipe string above the sealing unit, the input of the channel for supplying the pumped medium of the jet pump is connected to the pipe string below the sealing unit, and d the channel for supplying the working medium to the active nozzle is connected to the space surrounding the tubing string, and several channels for supplying a pumped medium are made in the jet pump housing (see patent RU 2106540 C1, class F 04 F 5/02, 03/10/1998 )

 This jet installation allows for various technological operations in the well below the installation level of the jet pump, including by reducing the pressure drop above and below the sealing unit. However, this installation does not allow full use of its capabilities, which is associated with suboptimal ratios of the sizes of inserts for measurements, for example, inserts for recording recovery curves of reservoir pressure.

 The problem to which the present invention is directed is to optimize the sizes of various structural elements of the installation and thereby increase the reliability and productivity of a downhole jet installation.

This problem is solved due to the fact that the well jet unit for testing and developing horizontal wells contains a funnel, liner, packer and jet pump with a stepped through channel, a sealing unit, a wireline cable and interchangeable functional inserts: depression, blocking and an insert for recording recovery curves formation pressure in the under-packer space of the well, while under the jet pump in the tubing below or above the packer, a device with step a pass-through channel to accommodate an insert for recording reservoir pressure recovery curves; an autonomous device for recording bottom-hole pressure and reservoir fluid parameters or a device for transmitting this information via a wireline to the surface and organizing visual observation of the test process and operational controlling it, the insertion length for recording the reservoir pressure recovery curves L is greater than the internal diameter of the pump o-compressor pipes D ₁ , the diameter of the passage of the jet pump above the seat D _{2 is} not less than 1 mm less than the inner diameter of the tubing D ₁ and not less than 0.5 mm more than the diameter D _{3 of the} lower stage of the passage of the jet pump, the last diameter D _{3 is} not less than 0.8 mm larger than the diameter D _{4 of the} upper stage of the passage channel of the device for installing an insert for recording formation pressure recovery curves and not less than 1.8 mm larger than the diameter D _{5 of the} passage channel of the lower stage of this prispos Blenheim and the diameter D ₆ for the insertion of registration restoration curves reservoir pressure not less than 0.5 mm smaller than the diameter D _3, the lower-stage flow channel of the jet pump.

Analysis of the operation of a downhole jet installation showed that the reliability and productivity of the installation can be improved by performing various structural elements of the installation, in particular functional inserts, with strictly defined dimensions. It was found that in the case of functional inserts, and in particular, inserts for registering reservoir pressure recovery curves of length L of at least the inner diameter of the tubing D _1, it is possible to increase the reliability and tightness of the installation of the functional insert in a device with a stepped passage channel. Reducing the likelihood of installing functional inserts with a bias helps prevent possible overflows of the medium, as well as the disruption of the functional insert from the seat. In addition, the possible jamming of the inserts in the pipe string, in the jet pump housing and in the device with a stepped passage channel during the installation or removal of the functional inserts is prevented. The implementation of these devices with the following size ratios is also aimed at preventing jamming of the pipes being lowered along the pipe string: the diameter D _{2 of the} inlet channel of the jet pump above the seat is not less than 1.0 mm smaller than the inner diameter of the tubing D ₁ and not less than 0.5 mm more than the diameter D _{3 of the} lower stage of the passage channel of the jet pump, the diameter D _{3 of the} lower stage of the passage channel of the jet pump is not less than 0.8 mm larger than the diameter D _{4 of the} upper stage of the passage channel of the device for an insert installation for recording reservoir pressure recovery curves and not less than 1.8 mm larger than a diameter D _{5 of the} passage channel of the lower stage of this device, and an insert diameter D ₆ for recording reservoir pressure recovery curves of at least 0.5 mm less than the diameter D ₃ lower stages of the passage channel of the jet pump.

 Thus, the achievement of the objective of the invention has been achieved - optimizing the size of the structural elements of the installation and thereby improving the reliability and performance of the downhole jet installation.

 In FIG. 1 shows a longitudinal section of the described downhole jet unit without a sealing assembly and insert for recording formation pressure recovery curves; figure 2 presents a longitudinal section of a downhole jet unit with installed sealing unit and insert for recording the recovery curve of reservoir pressure.

A downhole jet installation for testing and developing horizontal wells contains a tubing string 1, a funnel 2, a liner 3, a packer 4 and a jet pump 5 with a stepped passage channel 6, a sealing assembly 7, a wireline 8 and interchangeable functional inserts: depression, blocking (not shown) and an insert 9 for recording reservoir pressure recovery curves in the under-packer space of the well. Under the jet pump 5 in the tubing 1 below or above the packer 4, a fixture 10 is installed with a step-through passage 11 for installing an insert 9 for recording the reservoir pressure recovery curves. Under insert 9 for recording formation pressure recovery curves, a stand-alone device 12 is installed for recording bottomhole pressure and formation fluid parameters or a device for transmitting this information via a wireline cable to the surface and organizing visual observation of the test process and operational control thereof. The length of the insert 9 for recording the curves of reservoir pressure recovery L is greater than the inner diameter D _{1 of the} tubing 1, the diameter of the passage 6 of the jet pump 5 is higher than the seat D ₃ not less than 1 mm less than the inner diameter D _{1 of the} tubing 1 and not less than 0.5 mm larger than the diameter D _{3 of the} lower stage of the passage channel 6 of the jet pump 5. The diameter D _{3 of the} lower stage of the passage channel 6 of the jet pump 5 is not less than 0.8 mm larger than the diameter D _{4 of the} upper stage of the passage channel 11 of the device 10 for mustache anovki inserts 9 for registration curves recovery reservoir pressure and not less than 1.8 mm larger than the diameter D ₅ of the through passage 11 of the lower stage of this device is 10. The diameter D ₆ inserts 9 for registration recovery curves reservoir pressure not less than 0.5 mm smaller than the diameter D _{3 of the} lower stage of the passage channel 6 of the jet pump 5.

 A jet pump 5 with a step-through passage channel 6, a packer 4, a liner 3 with a funnel 2 and a device 10 for installing an insert 9 for recording the reservoir pressure recovery curves is lowered into the well at the tubing 1. The jet pump 5 is installed in the well above the reservoir 13. Then, insert 9 into the well 8 for recording pressure recovery curves and a sealing assembly, which is movably placed on the well cable above insert 9, after logging cable 9 is inserted to record pressure recovery curves with autonomous device 12 to the seat in the stepped passage channel 11 of the device 10 by supplying fluid to the nozzle of the jet pump 5 create a given depression on the reservoir and measure the volume of open fluid and bottomhole pressure, while draining the reservoir until a stable production rate is achieved, and then by abruptly stopping the flow of the working fluid into the nozzle 14, close the check valve of the insert 9 pressure recovery curves, thus separating the sub- and nadpakerny space and register on the surface pressure recovery curves in the under-packer space using a stand-alone device 12 (stand-alone depth tool or recorder) by transmitting information through a wireline cable. Based on the results of the study, they conclude that the well is ready for operation and take measures to launch the well into operation or take measures to increase well productivity.

 The present invention can be used in the oil and gas industry in testing and developing, respectively, oil and gas wells after drilling or during their repair.

Claims (1)

A downhole jet installation for testing and developing horizontal wells, containing a funnel, a liner, a packer and an jet pump with a stepped passage channel, a sealing unit, a wireline cable and interchangeable functional inserts: a depression, blocking and insert for recording formation pressure recovery curves in the sub-packer space of the well, at the same time, under the jet pump in the tubing below or above the packer, a device with a step-through passage for installing inserts is installed To register reservoir pressure recovery curves, an autonomous device for recording bottomhole pressure and reservoir fluid parameters is installed under the insert for recording reservoir pressure recovery curves or a device for transmitting this information via a wireline to the surface and organizing visual observation of the test process and its operational control, insert length for registration reservoir pressure-L larger than the inner diameter of the tubing ₁ D diameter communicating The channel of the jet pump above the seat D ₂ is not less than 1 mm smaller than the internal diameter of the tubing string D ₁ and not less than 0.5 mm larger than the diameter D _3, the lower-stage flow channel of the jet pump, the latter diameter D ₃ at least less than 0.8 mm larger than the diameter D _{4 of the} upper stage of the passage channel of the device for installing the insert for recording reservoir pressure recovery curves and not less than 1.8 mm larger than the diameter D _{5 of the} passage channel of the lower stage of this device, and the diameter D _{6 of the} insert for registrar and the curves of reservoir pressure restoration are not less than 0.5 mm less than the diameter D _{3 of the} lower stage of the passage channel of the jet pump.

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