RU179964U1 - Open hole cumulative rock drill - Google Patents

Abstract

Usage: in perforating explosive equipment, lowered into the well through tubing (tubing); with the secondary opening of the borehole zone of the reservoir. Technical problem: simplifying the design of the product, improving ease of maintenance and productivity. The essence of the utility model: the frame on which the cumulative charges are located is made up of many parts (frame units) that are movably connected to each other by the "puzzle" method. On each individual frame unit there is one cumulative charge. Frame units have a movable connection with each other, as a result of which each cumulative charge can take a position closest to the normal relative to the well wall. This does not allow the formation of an additional layer of liquid in the path of the cumulative jets. Parts of the frame, on which the punch orientation nodes are located in the borehole space, are also located on separate frame units connected to the remaining parts of the frame by the "puzzle" method. Effect: punch design with the possibility of collecting the frame of almost any length (the length is limited by the tensile strength of the material from which the frame units are made). 1 s.p. f-ly, 3 ill.

Description

The utility model relates to perforating explosive equipment, lowered into the well through tubing (tubing), and can be used in the secondary opening of the borehole zone of the reservoir.

Known open-body cumulative perforator (SU 1272785, ЕВВ 43/117, publ. 04/15/1991), including charges in individual buildings, explosive devices and a connecting element of a segmented section with recesses. In this device, all charges are located in one direction, which reduces the scope of the device. The segmented connecting element to which the charges are attached, after being triggered, is not subject to subsequent operation due to the formation of holes in it from cumulative jets of charges.

Known open-hole tube perforator for blasting in a well (RF patent for utility model No. 70929, IPC7 ЕВВ 43/117, publ. 02.20.2008), containing a supporting frame in the form of a metal pipe, in which the mounting holes for installation and fastening of sealed charges . The disadvantage is the difficulty in determining the number of operations of the punch depending on the strength and dimensional characteristics of the pipe from which the carrier frame of the punch is made.

The closest in essential features to the claimed technical solution is a cumulative open-hole perforator (SU 739914, ЕВВ 43/117, publ. 02.15.1991) containing charges in individual cases, a fuse and a connecting element with a segmented section and recesses made on the side of a flat surface and forming sealed cavities with charge bodies for forming cumulative jets. Due to the center of gravity substantially displaced relative to the axis, the punch almost constantly slides along the wall of the well with a segment element, i.e. the charges are at an optimal distance from the borehole wall, which ensures the greatest penetration when a perforator explodes. Simplification of the manufacture of the punch due to the possibility of working without special orienting devices and mainly due to the reduction of tripping operations allows to achieve technical and economic efficiency. Since there is no rigid steel case, the perforator can be assembled into a long garland up to (20 ... 30) m, which ensures high productivity of work in the well. However, the following disadvantages should be noted:

- the relatively large length of the frame modules does not allow repeating the profile of the well wall exactly, which may cause additional barriers to form cumulative jets — a significant layer of fluid in the well between the surface of the perforator and the wall of the well;

- long wireframe modules can create additional conditions for “sticking” in case of failure of individual cumulative charges, which, in turn, can lead to difficulties in removing the punch from the well or even create an emergency;

- the increased mass of frame modules creates peculiar difficulties in the transportation of perforators.

The technical problem that the utility model addresses is the elimination of the aforementioned drawbacks, namely: simplifying the design of the product, reducing its cost, increasing ease of maintenance and productivity.

This problem is solved due to the fact that:

- the frame on which the cumulative charges are located is made composite of many parts (frame units) movably connected to each other, and on each individual frame unit there is one cumulative charge. Frame units have a movable connection with each other, as a result of which each cumulative charge located on a separate frame unit can take a position closest to the normal to the well wall, which will lead to the creation of the most favorable conditions for the operation of cumulative jets;

- connecting the frame units to each other using the "puzzle" method allows you to assemble the frames of punchers of almost any length (the length is limited by the tensile strength of the material from which the frame units are made). The puzzle fastening system allows you to quickly, simply turn disparate elements into a high-quality integral product.

- The small length of a single frame unit allows you to avoid "sticking" in case of failure of individual cumulative charges.

To illustrate the utility model, a concrete example of the implementation of a perforator with reference to the accompanying drawings, in which: in FIG. 1 shows a hammer drill, a general view; in FIG. 2 - position of the perforator in the well; in FIG. 3 - the location of the cumulative charges on the frame.

The device operates as follows.

The perforator refers to destructive cumulative perforators with a removable garland of frame modules (puzzles) 8 and is a device, the executive body of which is cumulative charges 9, attached with glue to the modules (puzzles). Puzzles are connected into a garland of the required length using the dovetail lock system and the pin 15 is pressed in. Next, they are connected through adapters 6 and 12 to the head 2 and to the tip 14 according to the figure. To facilitate the descent of the perforator into the well, a tip 14 is used, having previously pressed the mustache 4 of the pressing device to the perforator body. The hammer drill is lowered into the well on an armored cable using cable head 1. The electric circuit in the hammer drill connected to the cable is formed by a conductive residential cable, electric wire 5, an incandescent bridge, the mass of the hammer and the armor of the cable. On the head 1, on the puzzles for the clamping device 11 and on the tip 14, a clamping device is installed, consisting of a bracket assembly with a mustache 4, clamp 3, spring 13, wrapping a bracket with a mustache. Next, the perforator is lowered into the tubing (tubing), pre-pressing the mustache of the clamping device.

Then the puncher enters the borehole of a larger diameter, spring 13, works and brings the bracket with the mustache 4 to its original state. The mustache with its sharp end abuts against the well and presses the punch. For a tighter pressure, the punch is pulled up a little, thereby deforming the mustache and pressing the punch to the well. The triggering of the charges 9 comes from a detonating cord (LH), inserted into the groove in the upper part of the charge housing, pressed by the liner and the clamping bracket 16. The LH is initiated by an explosive cartridge 7, which is placed on the adapter with a stand 17. To connect the explosive cartridge, an adapter 18 is used, for connection with a conductive residential cable - electric wire 5 and insulating tape 19. The lower end of the LH is closed with tape 19. After installing the hammer in a predetermined interval, an electrical impulse is supplied. In this case, the operation of the explosive cartridge, DS and charges.

The cumulative jet formed when the charge is triggered breaks through the puzzle, the fluid layer, the casing string, the cement layer and forms a channel in the rock, ensuring the formation communicates with the well. After shooting, the perforator is removed from the well. The head, tip, adapters, clamping device, puzzle for installing the clamping device are used repeatedly. Before reuse, parts are inspected to determine their suitability. The extracted punch allows you to judge the number of triggered charges (by the presence of holes in the puzzles). The design of the charge housing simplifies assembly with a detonating cord and with frame modules.

Claims (2)

1. An open-hole borehole cumulative perforator, including a frame with cumulative charges installed along the entire length of the device, connected tightly to the punch frame and dispersed along the length of the device in the form of a garland, a cumulative charge initiation unit, a tip and orientation units of a perforator in the borehole space, characterized in that the frame consists of several parts (frame units), connected movably to each other by the "puzzle" method, and on each individual frame unit there is one cumulative charge, while the parts of the frame with perforator orientation nodes located in the borehole space are also located on separate frame units, able to connect with the rest of the frame by the "puzzle" method. 2. An open-body cumulative perforator according to claim 1, characterized in that the individual wire-frame units capable of connecting to the rest of the frame by the “puzzle” method use a type of fastener with a dovetail lock system.

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