RU2644366C1 - Multi-channel demountable long-length flexible column - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of operation of gas-oil wells, namely to flexible pipes of oil grade (coiled tubing). Multi-channel long-length flexible column consists of at least two flexible long-range service channels selected from the group: hydraulic lines, power electrical cables, fiber-optic and electrically conductive information lines, and fused together with an elastic casing into a long-length section. Column consists of at least two long sections in elastic casings with a selected set of service channels. At least one mating surface parallel to the axis of the column is formed on the elastic casing of each long-length section to connect the sections to each other. In this case, one of the mating surfaces has long-length locking grooves, and the other – reciprocal matched long-length locking tabs, providing connection of a long-length section into a column when running in and disconnection when lifting a multi-channel, long-length flexible column from a well.

EFFECT: technical result is the preparation of a multi-channel long-length flexible column with the necessary set of service channels in accordance with the applied well technology or artificial lifting method.

5 cl, 29 dwg

Description

The invention relates to the field of operation of oil and gas wells, and in particular to flexible pipes of the oil assortment, in particular to long flexible pipes made with the possibility of winding on a drum for work in deep wells.

The practice of using long flexible pipes in the well shows that for many technological operations in the well, as well as for lifting the reservoir fluid by various methods of mechanized production, it is advisable to have multichannel long flexible pipe systems, of various configurations and with various additional channels.

Known multi-channel long flexible column (US patent 8459965 from 06/11/2013), consisting of several hydraulic and electrical channels, which are in a single fused shell of extruded material with two parallel planes for easy winding on a drum. The extruded material deposited and enveloping the hydraulic and electric channels make up a single multi-channel element in the form of a long flexible pipe, which serves as a good protection for hydraulic and electric channels. The ratio of the number of electric and hydraulic channels and their diameters depends on the type of submersible pump used: an electric centrifugal or hydraulic drive or the type of technological operation. As hydraulic channels, standard metal or plastic long flexible pipes, capillary tubes can be used, electric wires or cables, fiber optic lines can be used as electric and information channels.

The disadvantage of the aforementioned multi-channel long flexible pipe is that all hydraulic channels are rigidly assembled at the factory into a single multi-channel long length of standard flexible tubing (coiled tubing) of circular cross section with a given configuration, which can no longer be changed without complete factory separation of all channels and creating a new multichannel length meter. Any flexible tubing, being wound on a drum, accumulates internal stresses that are maintained during the production of a multi-channel long flexible pipe and, under certain conditions, begin to twist and / or bend it. In addition, a multi-channel long flexible pipe enters the well already wound onto a drum, which reduces the depth of descent of a multi-channel long flexible pipe by several times compared to a single-channel long flexible pipe wound on the same drum.

Known multi-channel long flexible pipe and method of its manufacture (US patent 8925627 from 01/06/2015), including the use of a long metal flexible section and one or more long service channels, which are enclosed in a metal long pipe, obtained by welding the side edges of a long strip, rolled up into a long pipe taking into account the permissible voltage and temperature. The resulting multichannel long flexible pipe with one or more long service channels inside is wound on a drum. The internal service channels of a multi-channel long flexible pipe can be used to transport fluids, energy and information to or from the well.

The disadvantage of the aforementioned multichannel long flexible pipe is that all hydraulic channels are rigidly assembled at the factory in a single length meter of a given configuration and section. In order to add additional service channels and / or electrical wires, replace or remove existing ones, it is necessary to carry out complex, time-consuming and expensive technological operations.

The problem to which the present invention is directed, is to create a reliable bundle of two or more long flexible pipe channels and electrical conductors, as well as fiber optic channels in the form of a single collapsible multi-channel flexible long.

EFFECT: collection (compilation) of a multichannel long flexible column with the necessary set of service channels in accordance with the applied downhole technology or mechanized production method.

The specified technical result is achieved due to the fact that a collapsible multi-channel long flexible column consists of at least two flexible long service channels selected from the group: hydraulic lines, power electric cables, fiber optic and electrically conductive information lines, and fused together with an elastic sheath long section, according to the invention, the column consists of at least two long sections in elastic shells with a selected set of service channels, p at the same time, at least one mating surface parallel to the axis of the column is made on the elastic shell of each long section to connect the sections to each other, while one of the mating surfaces has long lock grooves and the other mates the long mating lock protrusions, which connect the long sections into the column during the descent into the well and the separation of the column during the ascent from the well of a multichannel long flexible column.

Alternatively, one of the mating surfaces has both long lock grooves and long lock protrusions, and the other, respectively, mate long lock protrusions and long lock grooves.

The outer cross-section line is made, for example, in the form of an easily sealed circle, an ellipse, two semicircles.

Long sections in polymer shells are made with the possibility of connecting with each other into a single flexible long multi-channel column directly at the wellhead during descent into the well or are disconnected from each other at long sections directly at the mouth when lifting from the well and winding onto different drums.

Long sections are made with the possibility of connecting with each other in a multi-channel long flexible column and disconnecting from each other into separate single long sections directly in the workshop.

The invention is illustrated by graphic materials, which depict: FIG. 1 is a cross section of a lengthy section with locking grooves on the mating surface, FIG. 2 is a cross-sectional view of a long section with locking grooves and with locking protrusions on the mating surface, FIG. 3 is a cross-sectional view of a long section with locking protrusions on a mating surface, FIG. 4 is a cross section of a lengthy section with a heating cable for the hydraulic channel, FIG. 5 is a cross section of a lengthy section with a different set of service channels with circular sections of electric channels, their relative positions and two mating surfaces, each of which has locking grooves and locking protrusions, FIG. 6 is a cross section of a lengthy tread section of the locking grooves and locking protrusions, FIG. 7 is a cross section of a refined version of a lengthy section with a different set of service channels with rectangular sections of electric channels, their location, and two mating surfaces with locking protrusions on each surface, FIG. 8 is a cross-sectional view of a lengthy connector section without service channels and two mating surfaces and two locking projections on each surface, FIG. 9 is a cross section of a lengthy section with two hydraulic channels and two mating surfaces and two locking projections on each surface, FIG. 10 is a cross-sectional view of a lengthy stub section without service channels and two locking slots, FIG. 11 is a cross-sectional view of a multi-channel production column with a submersible hydraulic drive pump, FIG. 12 is a cross section of a multi-channel production column with submersible hydraulic drive pumps for simultaneous and separate operation of two layers, FIG. 13 is a cross-sectional view of a multichannel column for a well operation to remove liquid and sand from a well; FIG. 14 is a cross section of a multi-channel production column with submersible screw or plunger pumps with oil-filled rod channel, FIG. 15 is a cross section of a multi-channel production column with a submersible electric centrifugal pump or a screw pump with a submersible electric drive, FIG. 16 is a cross section of a multi-channel production column with submersible electric centrifugal pumps and / or a screw pump with a submersible electric drive for simultaneous and separate operation of two layers, FIG. 17 is a cross-sectional view of a multi-channel gas production column or jet pump; FIG. 18 is a cross-sectional view of a multichannel production column by a submersible waterjet pump or a jet pump, FIG. 19 is a cross-sectional view of a multi-channel production column with submersible electric centrifugal pumps and / or submersible screw pumps and a cable section for simultaneously and separately operating three layers, FIG. 20 is a cross-sectional view of a multi-channel production column with submersible screw and / or plunger pumps with oil filling of the annulus for simultaneous and separate operation of two layers, FIG. 21 is a cross-sectional view of a multi-channel production column with a submersible screw or plunger pump with oil filling in the annulus and with a submersible electric centrifugal pump and / or screw pump with a submersible electric drive for simultaneous and separate operation of two layers, FIG. 22 is a cross-sectional view of a multi-channel drill string with a flushing channel, two hydraulic power channels and a three-core power cable section, FIG. 23 is a cross-sectional view of a multi-channel production column with a submersible electric centrifugal pump or a screw pump with a submersible electric drive and a cable section and a heating cable at the elevator hydraulic channel, FIG. 24 is a cross-sectional view of a multi-channel production tower using a gas lift or a jet pump and a heating cable on an elevator lift channel, FIG. 25 is a cross-sectional view of a multi-channel production column with submersible electric centrifugal pumps and / or screw pumps with a submersible electric drive and cable section for simultaneous and separate operation of high-rate two layers, FIG. 26 is a cross-sectional view of a multi-channel production column with a jet or water trap pump, FIG. 27 and FIG. 28 is a cross-sectional view of a lengthy section for highly curved wells with various options for additional lengthy lock protrusions on the mating surface 3, FIG. 29 is a cross-sectional view of a long section for highly curved wells with additional long lock slots on the mating surface 3.

Collapsible multi-channel long flexible column 1 consists of long sections 2. Each section 2 has a surface 3 parallel to the axis of the multi-channel column 1, on which there are locking elements in the form of long grooves 4 or in the form of reciprocal long protrusions 5, mating to each other. If there are two separate parallel surfaces 3 on section 2, on both surfaces 3 there are lock lengthy protrusions 5 (Fig. 1). Alternatively, on one mating surface 3 there may be both long grooves 4 and long protrusions 5 (FIG. 2). In the present invention, as an example, standard service coils (API-5ST standard) 6 metal coiled tubing are used, but steel-braided rubber or polymer long pipes of corresponding diameters (for example, high-pressure steel-polymer load-bearing pipes, etc.) can be used as service hydrochannels . As an example, copper wires are used as service conductive conductors 7 of the power electric cable (Fig. 3), but other metals or conductive liquids, or the coiled tubing body itself can also be used 6. In addition, informational electric wires 8 can be placed in sections in addition and fiber optic channels (not shown) or capillary tubes 9 for delivering chemicals to the well (FIGS. 5 and 7). In wells complicated by the presence of asphalt-resinous-paraffin deposits (paraffin deposits), you can install an external heating cable 10 (Fig. 4). To protect long grooves 4 and long protrusions 5 from being crushed, dirt and ice getting on them, preventing the sections from being caught by locking elements between themselves on the drum, etc., and also for convenience when winding-unwinding sections on or from the drum, a non-working protective section-protector 11 is used (Fig. 6), which is installed on the working section 2 at the factory or in the workshop before winding onto the drum, which is removed from the working section 2 before being lowered into the well and installed on it again when rising from the well. To connect sections 2 to each other with identical mating planes 3, a connector section 12 (Fig. 8) without service channels and two mating surfaces 3 and reciprocal locking protrusions and / or locking grooves on them can be used. To arrange the maximum number of service channels in a multi-channel long flexible column 1 in one long section 2 can be placed two channels simultaneously (Fig. 9). In order to give the cross section of the long section easily compacted geometric shapes, for example in the form of a circle, an ellipse, two semicircles and two planes, etc., a dummy section 13 (Fig. 10) can be used without service channels with two mating surfaces and mating locks protrusions and / or locking grooves on them. In addition to the above ten options, other configurations of service sections 2 can be applied in accordance with the technological and production requirements, but subject to the principle of having an interfacial plane 3, a locking groove-joint connection and easy sealing of a multi-channel long flexible column 1. In various options for compiling a multi-channel long flexible column 1 (Fig. 11-26) for various technological operations and production lines in the case of the use of a rod drive for reciprocating plunger submersible pumps and for rotary screw submersible pumps as a rod drive, a long flexible winding rod 14 (Fig. 14, 20 and 21), manufactured by the American company Weatherford under the brand COROD (www.weatherford.com/corod) or the Canadian company PRO- ROD (www.prorod.com). representing a single long-length flexible rod, which completely replaces the column of composite rods and has a length equal to the depth of descent of the submersible positive displacement pump. For highly curved wells on the mating surface 3 can be placed additional lengthy locking protrusions 15 (Fig. 27 and 28) and additional locking slots 16 corresponding to them (Fig. 29). The dimensions of the additional protrusions and additional grooves on one mating surface 3 may be different, but responsive to each other.

Collapsible multi-channel long flexible column 1 is composed and used as follows.

Option 1. For deep wells. Section 2 with the estimated lengths are brought to the well in separate drums. One of the sections 2 is brought up with a coiled tubing unit wound on a regular drum, and the others are installed on reeling-reeling devices (similar, for example, according to the principle of operation with self-winding armored electric cable during the descent and ascent of submersible ESPs). The necessary lower part of the well assembly is assembled for carrying out technological work in the well or the arrangement for carrying out the lift of the formation fluid using one of the methods of mechanized production to the surface. Sections from the drums are wound up and go into the connecting and disconnecting unit (not shown), which acts as a “zipper” lock, which makes up a multi-channel long-length flexible column 1 and feeds it as a whole to an ejector (not shown), after which the ends collapsible multi-channel long flexible columns are connected to the lineup and begins the flow of multi-channel columns 1 into the well. After connecting sections 2 to multichannel column 1 and completely lowering it to the well to a predetermined depth, the multichannel column is sealed at the mouth, if necessary, the upper ends of sections 2 are connected to their devices (power cables to the power source, hydrochannels to power pumps, electric wires and fiber-optic channels - to recording devices, etc.), and the planned technological operation is performed in the well (washing the face, injecting reagents, drilling, logging, etc.). After carrying out the technological operation, the multichannel column 1 is lifted by the ejector from the well with its simultaneous disconnection by the connecting-disconnecting unit on section 2 and with their subsequent winding onto their drums. After the multichannel column 1 is completely lifted from the well, the process line is disconnected, the wellhead closes, all the equipment on the surface is brought into transport position and leaves the wellhead.

Option 2. For shallow wells. If the depth of the well allows you to wind all the estimated length of the multichannel column 1 fully assembled on a regular drum of a coiled tubing unit, then in this case the multichannel column 1 is assembled in the workshop and delivered to the well in a finished form on a regular drum of a coiled tubing installation. In this case, the multichannel column 1 is lowered into the well and removed from it as an ordinary single coiled tubing, but with the installation of the track tracks of the ejector of the calculated geometry under the cross section of the multichannel column 1.

In the case of the production assembly, the multichannel column 1 is lowered into the well according to one of the above options, fixed and sealed at the wellhead and connected to the upper ends of the sections 2 with their devices (power cables to the electric power source, hydraulic channels to power pumps, electric wires and fiber-optic channels to recording devices, etc.) and then dismantle the connecting-disconnecting unit and the ejector, and all the equipment on the surface is brought into transport position and leaves the wellhead. Sections can be of the same estimated length with further transportation of empty drums to the workshop or, if a part of the section is left on the drum, this drum is left at the wellhead.

Various types of polymers, plastics, and elastic materials can be used as coating and joining materials, possessing the necessary abilities to bend, compress, stretch, mechanical wear, etc., as well as having low thermal conductivity, high heat resistance, resistance to aggressive environments and not causing harm to the environment.

The present invention allows to significantly increase the capabilities of coiled tubing installations when they are used both for technological operations in wells and for production options.

Claims (5)

1. Collapsible multi-channel long flexible column, consisting of at least two flexible long service channels selected from the group: hydraulic lines, power electric cables, fiber optic and electrically conductive information lines, and fused together with an elastic sheath into a long section, characterized in that the column consists of at least two long sections in elastic shells with a selected set of service channels, while on the elastic shell of each long section at least one mating surface is made parallel to the axis of the column for connecting the sections to each other, while one of the mating surfaces has long lock grooves, and the other is mating long lock protrusions connecting the long section to the column when lowering into the well and disconnecting when lifting a multi-channel long flexible string from a well. 2. Collapsible multi-channel long-length flexible column according to claim 1, characterized in that one of the mating surfaces has both long lock grooves and long lock protrusions, and the other, respectively, mate reciprocal long lock protrusions and long lock grooves. 3. Collapsible multi-channel long flexible column according to claim 1, characterized in that when assembled, its outer cross-section line is made in the form of easily sealed geometric shapes, such as a circle, ellipse, two semicircles. 4. Collapsible multi-channel long-length flexible column according to claim 1, characterized in that the long sections in polymer shells are made with the possibility of connecting with each other into a single flexible long-length multi-channel column directly at the wellhead when running into the well or disconnecting from each other to long ones sections directly at the mouth when lifting from the well and winding onto different drums. 5. Collapsible multi-channel long flexible column according to claim 1, characterized in that the long sections are configured to connect to each other in a multi-channel long flexible column and disconnect from each other into separate single long sections directly in the workshop.

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