RU176618U1 - Coring device - Google Patents

Abstract

The utility model relates to devices for coring underground formations, and more particularly to devices for drilling with coring. In the proposed coring device, comprising a body, a metal core pipe located inside the body, and a core cutter installed in the shoe, inside the core pipe, at least one insert made of fiberglass pipe with an outer groove in the lower part that is installed in the inner groove of the upper half of the shoe. An internal groove was completed with a diameter and length equal to the diameter and length of the external groove of the insert. The insert is made of fiberglass 2-3 mm thick. The gap between the insert and the core receiver pipe is 1-2 mm. Performing a core sampling device according to the proposed utility model improves the quality of the selected core by preserving the initial properties of the selected core with minimal inclusions of foreign substances, simplifying core extraction from the metal core receiving pipe, and increasing the convenience of core extraction from the core core receiver pipe and its further transportation and storage. In addition, the utility model also extends the life of steel core pipes.

Description

The proposed group of utility models relates to devices for coring underground formations, and more particularly to devices for drilling with coring.

Known core sampling device, comprising a housing, a core receiver located inside the housing, made in the form of a metal pipe, and containing a device for separating the core from the bottom, including a core cutter with a shoe [US Pat. RF №2366796].

Due to high sliding friction, core movement through metal core-receiving pipes occurs with considerable difficulties, which can lead to jamming with a high risk of core fracture when it is removed from the core-receiving pipe. This is a disadvantage of the known device.

A disadvantage of the known device is also the short service life of core pipes.

The task of the invention is to improve the coring device of underground formations in order to simplify core recovery, prevent its destruction during extraction and transportation.

The technical result of the proposed utility model is to improve the quality of the selected core by maintaining the original properties of the selected core with minimal inclusions of foreign substances. Additional technical results include an increase in the service life of metal core-receiving pipes, the convenience of extracting the core from the core-receiving pipe and its further transportation and storage.

The specified technical result is achieved by the fact that in a core sampling device including a housing, a metal core receiving pipe located inside the housing, and a core explorer installed in a shoe, at least one insert from a fiberglass pipe with an external groove in the lower part is placed inside the core receiving pipe installed in the inner groove of the upper half of the shoe.

The specified technical result is also achieved by the fact that at the opposite end of the insert an additional internal groove is made with a diameter and length equal to the diameter and length of the external groove of the insert.

The specified technical result is also achieved by the fact that the insert is made of fiberglass 2-3 mm thick.

The specified technical result is also achieved by the fact that the gap between the insert and the core-receiving pipe is 1-2 mm.

The invention is illustrated in FIG. 1 and 2.

In FIG. 1 schematically shows a core sampling device, where: 1 - housing, 2 - core receiving pipe; 3 - insert; 4 - selected core; 5 - the upper half of the shoe; 6 - the lower half of the shoe, 7 - core cutter, 8 - groove in the upper half of the shoe 5.

In FIG. 2 shows a variant of a core sampling device with several inserts, where: 1 - body, 2 - core receiving pipe; 3 - insert; 4 - selected core; 5 - the upper half of the shoe; 6 - the lower half of the shoe, 7 - kernel core; 8 - groove in the upper half of the shoe 5; 9 - additional insert; 10 - a groove in the upper part of the insert 3, 11 - a groove in the lower part of the insert 9; 12 - groove in the upper part of the insert 9.

The proposed core sampling device (Fig. 1) includes a housing 1, a metal core receiving pipe 2 located inside the housing 1. and a core explorer 7 installed in the lower half of the shoe 6. Inside the core receiving pipe 2 there is an insert 3 made of fiberglass pipe with a wall thickness of 2 3 mm. In the upper half of the shoe 5, a groove 8 is made with an inner diameter corresponding to the outer diameter of the insert 3, which prevents the insert 3 from falling into the lower half of the shoe 6 and does not interfere with the operation of the core cutter 7.

The core receiver pipe is connected to the upper half of the shoe through a thread, it is freely located inside the housing.

The proposed core sampling device (Fig. 2) includes a housing 1, a metal core receiving pipe 2 located inside the housing 1 and a core explorer 7 mounted in the lower half of the shoe 6. Inside the core receiving pipe 2, cylindrical inserts 3 and 9 are made of fiberglass 2-3 mm In the upper half of the shoe 5, a groove 8 is made with an inner diameter corresponding to the outer diameter of the insert 3, which prevents the insert 3 from falling into the lower half of the shoe 6 and does not interfere with the operation of the core cutter 7.

On inserts 3 and 9, grooves of the same length are made at the ends, providing the possibility of connecting the inserts to each other. An external groove of the selected diameter with a tolerance of minus is performed at one end, an internal groove of the same diameter with a tolerance of plus is performed at the other end, the length of the grooves is the same. The implementation of grooves should provide a tight connection of the inserts with each other.

The proposed core sampling device (Fig. 1) works as follows.

When assembling the core sampling pipe 2 (Fig. 1), insert 3 is placed in it. Next, insert 3 is inserted into the upper half of shoe 5 with a groove 8, after which the upper half of shoe 5 is twisted with a core receiver 2. After that, the entire assembly is placed in body 1.

The groove 8 made in the upper half of the shoe 5 prevents the insert 3 from falling into the lower half of the shoe 6 and does not interfere with the core explorer 7. For free passage of the core into the insert (so that jamming does not occur), the gap between the core and the insert should be at least 1.5 mm. This clearance is ensured by the choice of a drill head that provides an accurate core diameter.

The maximum clearance depends on the size of the core receiver pipe. For free passage of the insert into the core collection pipe, the gap between them is 1-2 mm.

The implementation of the insert made of fiberglass with a thickness of 2-3 mm ensures the rigidity of its geometry during core collapse and the ability to extract the insert with the core from the core pipe.

During core sampling, it passes through the shoe assembly and core breaker, gets into insert 3 located in the core receiving pipe 2 and freely moves upward in it. Coring takes place in two cases: when the required amount of core has been taken, or when a jam has occurred that prevents the continuation of coring. After drilling stops, the entire core sampling device rises. Due to the operation of the core explorer, the core breaks away from the bottom and remains inside the core receiver pipe. The entire assembly rises to the surface, the core receiver pipe is removed from the body, then the insert with the core inside is removed from the core receiver pipe. After removing the core with the insert from the core receiving pipe, the insert together with the core is cut into parts of a given length (for example, 1 m long), then plugs are put on the insert and the insert is used later as a body for transporting the core.

For coring using two inserts (Fig. 2) when assembling coring pipes 2, inserts 3 and 9 are placed in them one at a time. A tight connection between inserts 3 and 9 is ensured by corresponding grooves at the ends of these inserts.

The proposed core sampling device allows to simplify the extraction of core from a metal core pipe. Removing the core in the insert and its further transportation in the insert, as in a tube, helps to preserve the core until it is delivered to the laboratory

The proposed utility model also helps to extend the life of steel core pipes.

The implementation of the insert made of fiberglass, which has a lower coefficient of friction with the rocks than other materials, facilitates the passage of the core with its partial destruction.

Claims (4)

1. A core sampling device comprising a body, a metal core receiver pipe located inside the case, and a core explorer installed in the shoe, characterized in that at least one insert of a fiberglass pipe with an external groove in the lower part is installed inside inner groove of the upper half of the shoe. 2. A core sampling device according to claim 1, characterized in that at the opposite end of the insert an additional groove is made with a diameter and length equal to the diameter and length of the outer groove of the insert. 3. A core sampling device according to claim 1, characterized in that the gap between the insert and the core receiver pipe is 1-2 mm. 4. A core sampling device according to claim 1, characterized in that the insert is made of fiberglass with a thickness of 2-3 mm.

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