RU2459927C1 - Method and device for supporting incompetent rocks at extended areas of well bores - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: method includes assembling of profile overlapping device with cylindrical areas at the ends consisting of shaped tubes sections connected by welding along profile end faces, note that the sections are rigidly connected between themselves, mounting of shoe overlapping device with back-pressure valve from below, and from above flaring device with roll-forming head located in the upper cylindrical area of the overlapping device, descending of the overlapping device into mounting area in the well via the string connected between themselves by means of flaring device connection, extension of profile areas by pressure and final pressing of the overlapping device against the well walls by roll-forming head. Note that the sections are manufactured from not less than three shaped tubes without cylindrical areas except upper and lower sections that are equipped by corresponding cylindrical areas. All non-detachable connections of the sections are made of welded joints of corresponding profile face ends, note that expanding of upper cylindrical area is done by flaring device, after that this area is calibrated by roll-forming head with string lifting before final pressing.

EFFECT: structure simplification, time and material expenses are decreased.

2 cl, 1 dwg

Description

The invention relates to drilling wells, in particular for fastening unstable rocks in extended sections of wellbores.

It is known "Device for blocking the zone of complications in the well" (patent RU No. 2310737, IPC E21B 29/10, publ. Bull. No. 32 of 11/20/2007), including a shutter, consisting of sections in the form of shaped pipes with cylindrical sections along to the ends connected by a thread, an expander with a turning or rolling head located above the profile pipe and having a connection unit for drill pipes, with a check valve on the lower end of the overlap, and on the cylindrical sections of the profile pipe the internal thread is equipped with internal face grooves, the external thread is equipped with the corresponding inner ring grooves of the inner annular protrusion, while the external thread of the cylindrical section of the profile pipes is equipped with the outer grooves, and the internal thread is the corresponding external ring grooves of the outer ring protrusion, the outer and inner ring protrusions are equipped with respectively outer and inner thickenings corresponding to the outer and inner grooves.

The disadvantages of this device are:

- the complexity of manufacturing and the high cost of shaped pipes due to the high accuracy requirements in the manufacture of shaped pipes with cylindrical end sections;

- significant time spent on flaring of the overlap due to the presence of a large number of connecting threads when installing the overlap in wells with extended sections of the complication zones;

- the need to use the complex design of the shoe for its removal and lifting to the surface, which leads to a rise in the cost of all work and an increase in the total installation time of the overlap.

The closest in technical essence and the achieved result is "Device for blocking the zone of complications of drilling in the well" (PM RU No. 78514, IPC E21B 29/10, publ. Bulletin No. 33 of 11/27/2008), including an overlap, consisting of sections of profiled pipes with cylindrical sections at the ends connected by a thread, a flare mill with a rolling head located above the profiled pipe and having a connection node with drill pipes at the top and an overlap at the bottom, with a check valve on the lower end of the overlap, chrome e of this, sections of shaped pipes are prefabricated, consisting of shaped pipes with an end cylindrical section, connected by shaped ends by welding, while the threads on the cylindrical sections of the sections of shaped pipes are tapered and equipped with a sealing compound, and the external tapered thread is located at the lower end of the sections of shaped pipes and the inside is on top, while the flare bottom is equipped with a rolling head with cutting elements made with the possibility of opening the shoe.

This device implements a method comprising assembling a profile overlap with cylindrical sections at the ends, consisting of sections of profile pipes connected by welding along the profile ends, the sections being rigidly interconnected, installing a shoe with a check valve on the bottom of the overlap, and a flare with a rolling head on top, located in the upper cylindrical section of the shutoff, descent into the installation site of the shutoff well on the drill pipe string interconnected via a connection node azvaltsevatelya expansion pressure profile sections and a final pressing Perekryvatel to the walls of the well head rollers.

The disadvantages of this device and method are:

- significant time spent on flaring of the overlap due to the presence of a large number of connecting threads when installing the overlap in wells with extended sections of the complication zones;

- the need for preliminary expansion of the interval of the wellbore in which the profile shutoff is installed for flush installation of the shutoff, which entails additional tripping and, as a result, an increase in the time between opening the complication zone and the installation of the profile shutoff.

The technical task of the proposed method and device is to minimize the time between opening the zone of unstable rocks and installing a profile shutter in it due to simplification of the design of sections of profile pipes and increasing their length, the method of their fastening and installation in the well, as well as the absence of the operation to expand the wellbore after opening zones.

The technical problem is solved by a method for fixing unstable rocks in extended sections of wellbores, including assembling a profile overlap with cylindrical sections at the ends, consisting of sections of profile pipes connected by welding along the profile ends, the sections being rigidly interconnected, installing a shoe with a check valve from the bottom of the shutter and on top of the flare tool with a rolling head located in the upper cylindrical section of the shutoff, the shutter is lowered into the installation area in the wells on the drill string interconnected via razvaltsevatelya connection node, the expansion pressure profile sections and a final pressing Perekryvatel to the walls of the well head rollers.

What is new is that the sections are made of at least three profile pipes without cylindrical sections, with the exception of the upper and lower sections, which are equipped with corresponding cylindrical sections, and all one-piece section connections to each other are made in the form of welded joints of the corresponding profile ends, while the expansion of the upper cylindrical of the section is carried out by a flare tool, after which the section is calibrated with a rolling head and the drill pipe string is raised before the end pressing the shutoff against the walls of the well.

The technical problem for the implementation of the method is also solved by a device for implementing the method, comprising an overlap with cylindrical sections at the ends, consisting of sections of profile pipes rigidly interconnected, connected by welding at profile ends, a flare, connected by a right-hand thread to the upper cylindrical section of the overlap, with a rolling head located in the upper cylindrical section of the overlap, and a shoe with a check valve, threaded to the lower cylindrical end of the overlap atelier.

What is new is that the sections are made of at least three profile pipes without cylindrical sections, with the exception of the upper and lower sections, and all the permanent connections of the sections to each other are made in the form of welded joints of the corresponding profile ends, while the bearer is equipped with non-expanding rolling rollers.

The drawing shows a device with partial longitudinal and transverse sections.

A device for implementing the method of fastening unstable rocks in extended sections of wellbores (not shown), including a profile shutoff 1, consisting of sections 2 of profile pipes 3 with cylindrical sections 4, from above - for connecting the profile shutoff 1 through a right-hand thread 5 through a landing sub 6 s roller flare 7 and installation in the upper cylindrical part of the overlap 1 of the rolling head 8, and from the bottom for mounting the shoe with a check valve 9 using thread 10.

Sections 2 are prefabricated prefabricated, consisting of at least three profile pipes 3 without cylindrical sections (with the exception of cylindrical sections 4 of the upper and lower sections), interconnected by means of welded joints 11 at the profile ends.

Flare 7 is made without the possibility of changing the diameter of the circumscribed circle and is equipped with rigidly mounted rolling rollers 12.

Profile cutter 1 is lowered into the well (not shown) on drill pipes (not shown), which are connected to the cutter 1 through the connection unit flare 13.

The method is implemented in the following sequence.

Immediately after opening a section of a well with unstable rocks (not shown) and lifting a tool (not shown), the profile cutter 1 is lowered into the well on a drill pipe string (not shown) connected to the cutter 1 through the flare 13 connection unit. Sections 2 are preformed prefabricated, consisting of profile pipes 3, interconnected by means of welded joints 11 along the profile, the length of sections 2 is selected to the maximum that can be lowered into the well (at least three profile pipes 3), so that the juice atit welded to a minimum number of operations at the wellhead. Sections 2 themselves are also joined together by means of welded joints of the corresponding profile ends directly at the wellhead (not shown).

Upon completion of the descent of the profile cutter 1 in a given section of the wellbore (not shown), sections 2 are expanded by creating hydraulic pressure in them. Then, the flare 7 with the landing sub 6 and the rolling head 8 is disconnected from the overlap 1 by wrapping them on the right-hand thread 5 by rotating the drill string (not shown) until the rolling head 8 and flaring 7 exit into the part expanded by hydraulic pressure. In this case, the cylindrical section 4 of the upper section of the profile overlap 1 is expanded by rolling rollers 12 of the flare 7, after which the assembly is lifted until the rolling head 8 is completely out of the overlap 1 in order to calibrate its upper cylindrical part 4.

By further descent, the profile overlap 1 is calibrated over the entire length using the rolling head 8. Once the shoe with the check valve 9 reaches the rolling head, it is turned away from the thread 10 of the lower cylindrical part 4 of the profile overlap 1. Then, the full exit of the rolling head 8 and flare 7 from the profile the overlap 1 carry out the flaring of its lower cylindrical part 4 and raise the tool at the wellhead.

This invention allows to minimize the time between opening the zone of unstable rocks and installing a profile shutter in it by simplifying the design of sections of profile pipes and increasing their length. The number of welded operations at the wellhead is halved, in addition, only the upper and lower cylindrical sections of the overlap are expanded, and only calibration is performed along the entire length, which also reduces the time of this operation. In total, all this makes it possible to fix unstable rocks in extended sections of wellbores in a minimum amount of time. Also, the method allows you to install a profile overlap without additional expansion of the wellbore after opening the zone, which avoids additional tripping operations.

Claims (2)

1. A method for fixing unstable rocks in extended sections of wellbores, including assembling a profile overlap with cylindrical sections at the ends, consisting of sections of profile pipes connected by welding along the profile ends, the sections being rigidly interconnected, installing a shoe block with a check valve from the bottom, and on top - a flare tool with a rolling head located in the upper cylindrical section of the shutoff, lowering the shutoff into the installation section in the well on the drill pipe string, with united between each other through a flare joint, pressure expansion of the profile sections and the final pressing of the overlap against the well walls with a rolling head, characterized in that the sections are made of at least three profile pipes without cylindrical sections except for the upper and lower sections, which are equipped with corresponding cylindrical sections, moreover, all inseparable connections of the sections to each other are performed in the form of welded joints of the corresponding profile ends, while The outer cylindrical section is made by a flare tool, and then this section is calibrated with a rolling head with the drill pipe string raised before the final shutter presses against the well walls. 2. A device for implementing the method, comprising an overlap with cylindrical sections at the ends, consisting of sections of profile pipes rigidly connected to each other, connected by welding at profile ends, a flare, connected by a right-hand thread to the upper cylindrical section of the overlap, with a rolling head located in the upper cylindrical section of the overlap, and a shoe with a check valve, threaded to the lower cylindrical end of the overlap, characterized in that the sections are made of at least e three profile pipes without cylindrical sections, with the exception of the upper and lower sections, and all one-piece connections of the sections to each other are made in the form of welded joints of the corresponding profile ends, while the bearer is equipped with non-expanding rolling rollers.