RU2491415C2 - Method of dual completion of multiple-zone well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: in the method of dual completion of several producing horizons the producing horizons are separated with packers, and for dual production of hydrocarbons at least two bypassing systems of a submerged pump are used, which are connected to each other, every of which consists of a y-adapter, to which a pump plant is fixed, and a string of bypass pipes, and control of production is done through control of submersible pumps.

EFFECT: improved operational reliability of a well, and also possibility for unimpeded passage of measurement devices along the entire well plant of dual completion of a multiple-zone well without their contact with a pump set, besides, the set shall not rise to a wellhead, possibility to control production from every separately taken bed.

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Description

The invention relates to the oil and gas industry and can be used for the production of liquid or gaseous hydrocarbons and work in the well without removing pumping equipment.

The closest analogue of the claimed method is a simultaneous separate operation of several productive horizons (RF patent No. 2334867 C1, K21B 43/14, 03/21/2007), which includes lowering the liner with packers and well chambers on the string of tubing, installing a liner in the well and operation of the latter. According to the invention, a liner is assembled on the tubing and a funnel with a pressure or flow regulator with a check valve or plug is lowered into the well first. Then the tubing is lowered with one or more borehole chambers and the last or upper of the latter is placed at a distance of at least 2 internal diameters of the production casing of the lower holes of the perforation interval of the lower productive horizon. Then, the packer of the lower section of the liner is attached to the tubing, thus completing the assembly of the latter. After that, the second and subsequent sections of the shank are assembled and attached, depending on the number of productive horizons that will be exploited. The packer of each section of the shank is set to a height of at least 10 meters from the upper holes of the perforation interval of the developed productive horizon. After installing the last packer, a disconnection unit is connected and one or more borehole chambers are installed on the tubing above the last packer. Then the packers are brought into working position, dividing among themselves productive horizons. After that, well operation is started.

The disadvantage of the closest analogue is the inability to measure the geophysical parameters along the entire length of the well under the conditions of well operation, as well as the need to dismantle the pump unit and raise it at the wellhead in order to install a measuring or control device at the level of each formation. Also, the disadvantage of the closest analogue is the lack of technical devices that allow installing a plug or pressure or flow regulator without lifting it at the mouth of the pump unit and tubing installed above it.

The objective of the invention is to ensure unhindered passage of measuring instruments along the entire well installation for separate operation of a multilayer well without contacting them with a pump unit, moreover, the unit should not rise at the wellhead, and also provide the ability to control production from each individual formation.

The problem is solved in that in the method of simultaneous and separate operation of several productive horizons, according to which the productive horizons are separated by packers, according to the invention, at least two submersible pump bypass systems are interconnected, each of which consists of from the y-adapter, to which the pump unit and the bypass pipe string are attached, and the production is regulated by controlling submersible pumps.

In the case of well operation in normal mode, a blind plug is installed in the lower y-adapter.

In the case of geophysical exploration, logging plugs are installed in the γ-adapters, through which a cable passes, to which a measuring device is connected, which is lowered through the tubing string, through the γ-adapters, through the supply pipes, measurements are made in the space under the pumping unit.

The method involves the use of a certain number of bypass systems equal to the number of productive horizons. In FIG. The case with two productive horizons is depicted. The bypass system consists of a tubing string 1 with a Y-block 2 attached to it, a bypass tubing string 3, a submersible pump 4 and a packer 5 separating productive horizons 6.

The invention works as follows.

During regular operation of the well, a blind plug (not shown) is installed in the lower y-block using a fishing tool, which prevents fluid from circulating in the bypass pipe string 3.

In the case of measuring the geophysical parameters of the well from the lower y-block 3, a blind plug is removed using a fishing tool (not shown in Fig.). After that, a logging plug (in FIG. Not shown) with a through hole is installed in place of the dead plug, to prevent fluid circulation through the bypass string 3 and free passage of the cable (not shown in FIG.), On which the geophysical instrument is fixed (in FIG. shown), then conduct research at any point in the well under a running pumping unit.

An example of a specific implementation of the method. In the well, it is necessary to measure the parameters in the area under the pumping unit, in the conditions of commercial operation of the well. The pumping unit stops and a dead plug is removed from the lower y-block using a fishing tool, then a logging plug is installed in the y-block and a cable runs down the bypass pipe string with a geophysical instrument attached to it. Next, the pump installation is started, and after the well enters the operating mode, measurements are made on the entire length of the well in the area under the pump installation. After the measurements are completed and the results are recorded, the pumping unit is stopped and the cable with the geophysical instrument and the logging plug are removed, followed by the installation of a blind plug in the u-block. The advantage of this method lies in the relevance of the data obtained, since the measurements occur during the operation of the pump unit (to the mode of commercial operation of the well). The data obtained as a result of such studies are characterized by a high degree of reliability.

If it is necessary to regulate the intensity of production from a separate reservoir, this is done by regulating submersible pumps.

So, the claimed invention provides unhindered passage of measuring instruments along the entire borehole installation for separate operation of a multilayer well without contacting them with a pump unit, and the unit does not rise at the wellhead, and also provides the ability to control production from each individual formation.

Claims (1)

A method for simultaneous and separate exploitation of several productive horizons, in which productive horizons are separated by packers, characterized in that at least two submersible pump bypass systems are connected to each other simultaneously, each of which consists of a y-adapter, to to which the pumping unit and the bypass pipe string are attached, and the production is regulated by controlling submersible pumps.

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