JPS60258398A - Boring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 19. OBJECTS OF THE INVENTION The present invention relates to an underground polling device.

It is common practice to use shaped charges for poling underground debris, where each charge has a casing containing a predetermined explosive material and a conical shape inside the cage puffer. A recess is provided to accommodate the liner.

This is because when the explosive detonates, the liner penetrates the carrier wall, outer casing string and cement into the debris with great force, opening the debris and allowing fluid to flow into the casing string.

Conventional devices that take this approach use explosive carriers made of reusable materials to recover the gear after detonation, but such carriers are expensive to manufacture. , the consumables tended to become detached from the carrier upon detonation, preventing the carrier from being retrieved from the casing string.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a new polling device which eliminates the drawbacks of conventional devices, thereby eliminating any inconvenient obstacles to the efficient recovery of the device from the well casing and completely removing the carrier. It can be decomposed and does not pose any hindrance to the extraction of oil and gas from wells.

2. Structure and operation of the invention The structure and operation of the present invention will be explained based on the embodiments shown in the drawings.

In FIGS. 1 and 2, a carrier assembly [12+] constituted by explosive charges attached to a poling body, and a detonation cord Qgl passes through the carrier assembly Oz and connects to one end of each explosive charge (14+... The upper end of the blasting cord (+81) is connected to the blasting cap 0 at the lower end of the wireline tool (T), while the wireline tool (1) is connected to the upper end of the carrier assembly Q2 by a spiral rod. is suspended from.

After the explosive charge (+41) explodes and the carrier assembly (12+) is destroyed, the wireline tool ('11 is designed to be recovered and reused) is removed from the tapered cable end ( a sinker bar (a) and a magnetic detector (to) whose lower end is connected to a firing head adapter (to).A cable (to) is connected to the cable end (to), which Firing head adapter (to)
It has a wire conductor (to) protruding to the outside. This wire conductor (to) connects to the blasting cap example, and this blasting cap circle connects to the top end of the blasting cord (1g+). It is releasably connected to the lower end of the adapter (7) by a releasable fastener in the form of a turbine.

The carrier assembly a2 consists of an elongated tube part (2) with a uniform wall thickness except for the end part (0ηθ) where the inner wall surface has a slightly larger diameter. The upper and lower caps - θQ ends are inserted and joined here. This cap ■I46)
Both have a rounded, tip-shaped cylindrical wall 0η (47), and this cylindrical wall has a stepped portion 11JG191 that matches the inner diameter of the opposing end ODω, and also has an outer wall throat surface. coincides with the outer surface of the tube portion). Said cylindrical wall G1
7) The outer surface of the end Gll (4Q) of Iη is provided with a groove (7) in which an O-ring 52C)2+ is inserted. Adhesive is used on the joint surface between both caps (c) θ9 and the tube part (■). The upper cap (C) is provided with a through hole passing through the cylindrical wall Gη, into which the blasting cord (181) is inserted.A neoprene seal (A) is formed around this through hole 54. The lower end spiral portion of the connecting rod (C) is screwed into the spiral opening 5η at the top end of the upper cap (C).

Before attaching the caps hn tg) to the upper and lower ends of the tube section), the explosive charge (14+...) is suspended on the strap αυ in the carrier assembly 0z.The strap 00 is longer than the length of the tube section ■. It is slightly shorter, matching the length of the tube between the shoulders, and the width matching the inner diameter of the tube. The strap ae is an explosive α4
A series of openings 6... are provided at equal intervals to attach the
This opening corresponds to the cross-sectional shape of the explosive charge a4. Obikin (
161, tube section ■, and cap ■ (4Q) are made of brittle materials that can withstand the high pressures encountered during downhole operations, but they completely disintegrate when the explosive charge explodes. To this end, the straps, tubes and caps are manufactured, for example, in the proportions of 82% by weight Polymethyleff and 18% by weight of calcium carbonate, depending on the size of the carrier mass and the wall of the explosive. It will vary depending on the thickness or number of explosives.

One typical explosive body, shown in Figures 3 and 4, consists of a usually cylindrical steel jacket with an aperture S2 in the closed end (6). ing. In addition, usually a conical copper liner [41] and a jacket [F
] O) and the explosive - is inserted into the open end of the liner (G
4J and the jacket. The explosive charge is housed in a relatively thick-walled half-casing σ0, which houses most of the jacket (801) and connects to the opening (6) into which the blasting cord 0& is inserted.
70) is provided with an opening σ1) passing through one end thereof. The other half-casing consists of relatively thin walls and is tapered to the open end of the jacket 10). The joint ends of the two half-casings σO) ff3 are joined with adhesive, but the edge of the thick-walled half-casing button σ9
is larger than the aperture of the explosive aperture t5 seconds of the belt Q61.

In this way, the thin-walled half-casing 11Z is inserted through the opening side to the end edge σ9 of the thick-walled half-casing σ0), but the total length of the casing 40 for the explosive charge is the same as that of the carrier assembly (121). It corresponds to the diameter of the inner wall and is held between the tube part holder.

Once assembled on both ends, it is suspended inside the bottom cap (/40).

By press-fitting the casing (7■621.) between the band a61 and the inner wall of the tube OI, internal grooves and positioning members for explosives are no longer required, and the structure of the carrier assembly 0z and the band (IND) is made of brittle materials. In addition to consisting of
Allows higher explosive capacities to be utilized in a carrier mass of fixed size.

For example, commercially available approximately 79
Approximately 4" of carrier gun explosive charge (22-22.7 g) can be used in the rear.

The aluminum connecting rod (c) protects the wireline tool ('11) from any damage when the explosive charge detonates.
It is long enough to protect the Since the connecting rod @ is severed just above the connection point with the carrier assembly a2 due to the explosion, the fragments of the connecting rod (c) are stuck in the hole together with the disassembled carrier assembly.

However, the remainder of the connecting rod and all wireline tool markings are completely recovered and replaced after each operation and another carrier assembly is installed for the next polling operation.

Other materials may be used in the construction of the carrier assembly to provide the desired strength for suspension of a series of explosive charges downhole, but would be completely destroyed by the explosion of the explosive charges. In particular, thermoplastics such as calcium carbonate exhibit the characteristics necessary to combine with a small portion of the carrier and increase its weight. When the explosive cap ignites, the detonation code (181) is activated, each explosive charge explodes, and the carrier liner (6
The apex of the seepage (69) is launched through the wall of the carrier assembly α2 into the rock debris, as shown in FIGS. 5 and 6.

The successive stages are shown in Figures 7 and 8 (-
As the liner apex (651) advances outwardly through the debris, it forms a cavity or fracture in the debris that facilitates the influx of fluid from the rock layer through the casing and into the defense. The carrier assembly (12) and the strap (161) completely disassemble and collect under the opening formed in the casing in the wellbore, so that no fluid flows into the interior of the casing, but rather above the fluid. Because of the thin-walled structure and fragility of the carrier assembly, there is no need to pre-cut an opening in the wall for liner ejection in the event of an explosion.

[Brief explanation of the drawing]

The drawings show an embodiment of the water-contacting invention, in which FIG. 1 is a longitudinal sectional view of the device suspended in a well, FIG. 2 is a longitudinal sectional view of the upper part of the device, and FIG. 3 is a sectional view taken along line 3, FIG. 4 is a front sectional view of the explosive charge section, and FIGS. 5 to 8 show the reversal and propulsion state of the conical liner by the explosive charge when it enters rock debris. Patent Applicant Magnum Jet Inc.

Claims (5)

[Claims] (1) A hollow carrier having a long and rigid tube section and a cap at both ends of the tube section is provided, openings are provided at equal intervals in a band inserted into this carrier, and an explosive charge is inserted into each opening. , a detonating cord extending through the carrier connected to each explosive charge, the carrier being constructed of a brittle material. (2) The poling device according to claim 1, wherein the strap is elongated and its width matches the inner diameter of the tube. (3) A polling device according to claim 1, wherein the entire carrier has a uniform wall thickness. (4) A poling device according to claim 1, wherein the explosive charge has an elastic casing of a length corresponding to the inner diameter of the tube portion, and the casing is provided with an opening for inserting the blasting cord. (5) A hollow carrier having a slender and rigid tube section and a cap at both ends of the tube section is provided, and openings are provided at equal intervals in a band inserted into this carrier, and an explosive charge is inserted into each opening. , a detonating cord extending through the carrier is connected to each explosive charge, and the carrier is suspended from a wireline tool via a connecting rod. (Margins below this page)