SU910227A1 - Apparatus for exciting ultrasonic oscillations in bore hole near-face area - Google Patents

Description

(54) DEVICE FOR THE EXCITATION OF SOUND VIBRATIONS IN THE WELLBASING ZONE OF THE WELLS A device for initiating sound waves in a wellbore zone of a well, which contains a hammer attached to a flexible link in an operating string, is known. The shape and dimensions of the impactor are chosen depending on the shape and size of the cross section of the production casing l J. A disadvantage of the device is that the section size of the casing cavity, according to the permissible size deviations, may be less than the transverse dimension of the impactor, which will lead to jamming devices. In addition, the gap between the impactor and the production string is 0.5-1.0 m, which characterizes the small amplitude of its oscillations. A device is known for exciting sound vibrations in the bottomhole zone of a well, which contains a hollow impactor with two diametrically located elastic elements with a contact surface with casing 2. The drawbacks of the device are low power and the zone of influence on the producing formation, as well as a decrease in reliability due to the fact that the flexible coupling takes part in the work of the drummer. The circuit of the invention is an increase in the power of action, as well as an increase in the reliability of each drummer. The goal is achieved by the fact that the known device is equipped with additional percussion bars and a pipe with hinged supports for mounting percussion bars on it. In order to avoid possible mismatch of oscillations of the strikers and supports, each striker is provided with a lock: a position torus, and the lock position is made in the form of eyelets made on the hammer, and a rod passed through the lugs and pipe. In FIG. 1 shows a device for excitation of sound vibrations; in figo 2 - section aa on figo1; FIG. 3 shows a section B-B in FIG. 1; in Fig 1, a well with the proposed device containing several drummers; in FIGURE 5, a possible variant of the mating of a drummer with a support. A device for exciting sound vibrations in the wellbore zone has a size corresponding to the cavity t of the production well string (see Fig. 2J. The number of impactors in the device corresponds to the thickness of the producing formation. The distance between the impactors is about 1 m. The device contains a pipe 2 on which axis x 3 pivotally mounted supports on which the strikers 5 are freely mounted 5 and the production column. On the outer side, the impactor has surfaces 7 and 8 for interacting with the cavity wall K to decrease the slip friction between the impact of the nick and the support k.To reduce the sliding friction between the impactor and the support 4 the end face of the striker is equipped with a pull-out 9. In order to eliminate the out-of-view mismatch of the directions of oscillations of the strikers and supports, clamps of the positions are pulled out, for example, in the form of the lugs 10 and the rod 11, while the striker is made of metal and elastic material. The metal part is smaller than the guaranteed diameter 12 of the production string. The gap between the metal part and the wall of the cavity 1 in the direction perpendicular to the plane of oscillation fills the elastic material in the form of flexible elements 13, tt, 15 o The device is attached by tube 2 to tubing pipes (CT) and lowered to the level of the productive formation “The annular space (cavity 1 of the production string) is closed, the medium along the string goes down, the impactors are actuated. and goes through the pipe 2 tubing to the surface (see Fig. k. The flow of the medium acts on the drummer as follows. The drummer in the cavity occupies an inclined position, blocking the cavity. The medium, acting on the drummer from one side, presses its lower part (the drummer slides on the support k) against the wall of cavity 1, while the impact of surface 8 is brought in. The drummer is pressed to one side of the cavity. k takes a position similar to the original, the medium acts on the drummer from the other side, forces it to press against the wall of the cavity with some speed. As a result of the impact with surface 8 (but on the other side of it) with the wall, the drummer again turns, takes the initial position and After the impact with the wall, surface 8 of the hammer is rotated because the resultant inertia forces are applied at the center of the impact, and surface 8 is spaced from this center. 8 as a result, the firing pin unfolds like a lever to which a load is applied. The center of impact is defined relative to the surface 7. Fsdamula of the invention to A device for the stimulation of sound vibrations in the wellbore zone, containing a hollow drummer with two diametrically placed elastic elements with a casing-contact surface, which is designed to increase the impact power. it is supplied with additional drummers with position fixers and a pipe with articulated F1 fasteners for the impactors. 2, The device according to claim 1, wherein the latch position is made in the form of lugs, made on the drummer, and the rod passed through the lugs and pipe. The source of information received by its attention during the examination 1. USSR author's certificate in application f 2651952 / 18-28, кп. B 06 B 1/18, 1979. 2. USSR Copyright Certificate No. 2836077 / 18-28, cl. B 06 B 1/18, 1979 (prototype).

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Claims (2)

Claim 1. A device for exciting sound vibrations in the near-wellbore zone of a well, comprising a hollow hammer with two diametrically located elastic elements with a contact surface with a casing string, characterized in that, in order to increase the power of the impact, the device is equipped with additional hammer with position fixers and pipe with articulated supports for drummers. 2. The device according to claim 1, wherein the position lock is made in the form of eyes made on the hammer and a rod passed through the eyes and pipe.