RU2334864C1 - Device for borehole calibration - Google Patents

Abstract

FIELD: building.

SUBSTANCE: invention refers to building, in particular to means of directed drilling with expansion of drilled boreholes. The device contains a column of drawing tubes with sludge-catching device asymmetrically fixed on it and executed in the form of a scraper tool. The device is supplied with a sludge collector asymmetrically fixed on a column of drawing tubes, a pipeline located in the collector and having a hydraulic exit in a hollowness of the sludge collecting section, and hydraulically connected with the column of drawing tubes, a directing crutch, mounted on the scraper tool in an opposite direction and asymmetric against the scraper tool.

EFFECT: gathering and removing larger fragments of drillable material which is not transported by a stream of flushing fluid, but remains on a sole of a borehole space because of its considerable size and mass in the course of expansion of a horizontal-directed borehole.

3 cl, 5 dwg

Description

The invention relates to the field of construction, in particular to means of horizontally directed drilling with the expansion of drilled wells, for example, by drilling and to means used in trenchless pipeline construction in the ground.

Known devices for calibrating a communication well containing a column of traction pipes, a collector with a slurry receiving section mounted on a column of traction pipes, a slurry gripping device and a pipeline hydraulically connected to the column of traction pipes and having an outlet to the slurry gripping device (for example, US 5456552, Е21В 7/28, 1995 -10-10, DE 4021719, E21B 7/30, 1992-01-09).

A disadvantage of the known devices is that their use involves simultaneously dragging the communication pipeline along with calibration and transporting the rock removed during calibration along the communication pipe channel, which ultimately complicates the subsequent preparation of the communication pipeline for operational purposes.

More preferable in this aspect and the closest analogue to the claimed technical solution is a device for calibrating a well, comprising a column of traction pipes, a collector with a sludge receiving section mounted on a column of traction pipes, and a sludge gripping device located in the collection pipe, hydraulically connected to the column of traction pipes, and hydraulic outlet from the pipeline (US 5351764, E21D 3/00, 1994-10-04).

However, when using the aforementioned device in the space of a horizontally directed well, selective removal of fragments of small fractions and accumulation of heavy fragments of large fractions takes place due to the inability of the flow of washing liquid to transport them and the inability of the sludge trapping device to carry out their mechanical destruction and / or dispersion. As a consequence of this phenomenon, subsequent dragging of the pipeline along the wellbore causes significant complications and emergencies.

The task to which the invention is directed is to create a means for calibrating a communication well for the purpose of subsequent unhindered installation of a pipeline in it.

The technical result that can be obtained by using the inventive device is to provide conditions for the collection and removal of relatively larger fragments of the drilled rock (fragments of a large fraction), which are not transported by the flow of flushing fluid during expansion of the trunk of a horizontally directed communication well, but settle on the bottom of the wellbore due to its considerable size and mass.

The specified technical result is achieved by a device for calibrating a well containing a column of traction pipes, a collector with a sludge receiving section fixed to a column of traction pipes, and a sludge gripping device located in the collection pipe, hydraulically connected to the column of traction pipes, and a hydraulic outlet from the pipeline, due to the fact that the collector with a slurry receiving section and a slurry gripping device are asymmetrically mounted on the column of traction pipes, and the slurry gripping device is made in the form of a scraper vogo means.

And also due to the fact that it is equipped with a guide bipod, while the guide bipod is mounted asymmetrically in the diametrically opposite direction on the scraper means.

And also due to the fact that the hydraulic outlet from the pipeline is made in the form of hydraulic nozzles oriented in the cavity and on the surface of the guide bipod.

The essence of the application of this technical solution is manifested in the fact that the asymmetric fastening of the collector with the sludge receiving section and the sludge gripping device on the traction pipe string ensures their displacement to the bottom of the well space under the influence of the weight of the traction pipe string, while the introduction of the guide bipod into the sole rock in the diametrically opposite direction will create conditions for holding the scraper means in the lowest position, regardless of the change in the position of the well in space, and Alice hydraulic output from the pipeline in the form of jetting nozzles oriented in shlamopriemnoy cavity section and the surface of the guide bipod, prevents the accumulation in the cavity section shlamopriemnoy dispersed fraction removed and easily washed rocks and provides selective collection of fragments of the coarse fraction, is easily removed through the discharge hatch rollover collection.

The essence of the claimed technical solution is illustrated by drawings, in which Fig. 1 shows a general view of the device, Fig. 2 is a section A-A of Fig. 1 with an arrangement in the cross-sectional area of the trunk of a communication well, Fig. 3 is a section BB of Fig. 1 with an arrangement in the cross-sectional area of the trunk of the communication well, FIG. 4 is a section B-B of FIG. 1 with arrangement in the cross-sectional area of the trunk of the communication well, in FIG. 5 is a section G-D of FIG. 1 with arrangement in the transverse zone section of the trunk of a communication well.

A device for calibrating a well contains a column of traction pipes 1. On the column of traction pipes 1, a collector 2 is mounted with a sludge receiving section 3 made with a cavity 4, and a sludge gripping device made in the form of a scraper means 5. In the collection 2 there is a pipeline 6 hydraulically connected to the column traction pipes, while the sludge receiving section 3 can be performed with at least one discharge hatch 7.

The device for calibrating the well can be equipped with a guide bipod 8, which in this case will be mounted asymmetrically in the diametrically opposite direction on the scraper means 5, while the hydraulic outlet from the pipeline 6 can be made in the form of hydraulic monitor nozzles 9 oriented in the cavity 4, and hydraulic monitor nozzles 10 oriented to the surface of the guide bipod 8.

The operation of the device is as follows.

A directional drilling of a pilot well is carried out along the project path. Next, the borehole of the communication well is formed by expanding the pilot well to the size required for dragging the duker (pipeline). The expansion is performed by reverse single or multiple movement of the drill pipe string in the pilot well, but with a rock cutting reamer (for example, with rotation and removal of cuttings by flushing with an appropriate solution injected through the drill pipe string). In the final phase of the formation of the communication wellbore, the above device is used simultaneously with or after expansion. In the first case, an arrangement is used where the calibration device for the communication well is installed on the traction pipe string following the expander, and in the second case, the arrangement of the specified device on the traction pipe string is used to separate movement along the wellbore.

Located in a horizontally directed well, the column of traction pipes 1 by gravity drops down to the bottom of the wellbore, providing the necessary position of the scraper means 5 with the introduction of the bipod 8 and the position of the collector 2 with the sludge receiving section 3 in the lower sector of the borehole section.

In the process of such movement, fragments of a large rock fraction accumulate in the cavity 4 of the sludge receiving section 3, and the fragments of the dispersed and easily eroded rock fraction separated in this case are removed by washing liquid, which is pumped to the scraper means through the string of draft pipes 1 into the pipeline 6 and then into the hydraulic nozzle 9. In addition to Moreover, through the pipeline 6, the flushing fluid enters the hydraulic nozzle 10 with a hydromonitor effect on the area of introduction of the bipod 8 into rock accumulations at the bottom of the wellbore. As a result of this interaction between the components of the device and the well, a trunk section free of movement for the duker is formed, in the space of which there are no fragments of a large fraction of the drilled rock that cannot be removed by the fluid flow. To unload the collector 2, the sludge receiving section 3 is turned down by the unloading hatch 7 by rotating the column of traction pipes.

Claims (3)

1. A device for calibrating a well containing a column of traction pipes with an asymmetrically mounted sludge gripping device made in the form of a scraper means, characterized in that it is equipped with an asymmetrically fixed on the column of traction pipes collector with a sludge receiving section, a pipeline located in the collector with a hydraulic outlet into the cavity of the sludge-receiving section and hydraulically communicating with the column of traction pipes, a guiding bipod mounted on a scraper means in a diametrically opposed With respect to the scraper means, the direction is asymmetrical. 2. The device according to claim 1, characterized in that the sludge collection section is made with at least one discharge hatch. 3. The device according to one of claims 1 and 2, characterized in that the hydraulic outlet from the pipeline is made in the form of hydraulic nozzles oriented in the cavity of the sludge receiving section and on the surface of the guide bipod.

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