SU1635156A1 - Device of three-component vertical seismic profiling probe - Google Patents

Abstract

The invention relates to equipment for seismic studies in wells using vertical seismic profiling. The aim of the invention is to improve the reliability and accuracy of operation of the device in inclined wells. The device contains a sealed enclosure with orthogonal installation of seismic receivers in hinged suspensions and a clamping device of lever type arc bracket and installed on it on supports and guides along the arc bracket of the centrally rotating sphere with A displaced center of gravity due to an attached load. A seismic receiver is rigidly fixed in the sphere's cavity. The degrees of freedom of rotation of the arc bracket in the body and the sphere on the arc provide oriented reception of seismic signals by the seismic receiver. 00 With:

Description

The invention relates to apparatus for seismic observations in wells by the method of vertical seismic profiling (VSP).

The purpose of the invention is to increase the reliability and accuracy of the device in inclined wells.

FIG. 1 shows the device, a general view; in fig. 2 - orthogonal installation of seismic receivers.

The device consists of a sealed housing 1 and a clamping device 2 lever type. In case 1 with the orientation of the coordinate axes with respect to the lever of the clamping device 2, the installation of 3 seismic receivers is mounted orthogonal.

The orthogonal installation 3 has a chassis 4 in which articulated suspensions 5 6 and 7 are installed. In the chassis 4 there are also installed a brake system consisting of three pairs of brake pads 8 with a common electromagnet 9 drive. 6 and 7 are connected to electrical circuits. Wiring device 10.

Each articulated hanger consists of a centrally rotating sphere 11, into the cavity of which a seismic receiver 12 is installed. The center of gravity of the sphere 11 from seismic receivers 12 is shifted due to a rigidly connected load 13. The sphere 11 has symmetrically placed support bearings 14 and guide bearings

About CJ SL

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15 along the meadow bracket 16. The arc bracket 16 has a chamfer and a side of the supporting surface that ensures minimal contact of the bracket with guide bearings 15, In turn, the arc bracket 16 with the axle support 17 on the radial and support bearings 18, 14 is installed in the chassis A. Axes 17 are installed in the chassis 4 mutually perpendicular, which ensures the orthogonality of the installation of the seismic receivers 12.

The device works as follows.

When observing in a well by the VSP method, the hermetic body 1 of the device and the orthogonal installation 3 which is attached to it, is clamped by the pressing device 2 against the wall of the well and occupies the position of observation determined by the inclination of the well.

By applying electrical voltage to the electromagnet 9, the brake pads 8 are holding the articulated suspensions 5, 6, 7. Each articulated suspension 5. 6, 7 under the action of an eccentrically displaced load 13, the sphere 11 is set to a certain position - by crnecv bearing bearings 14 and guide bearings 15 along the arc bracket 16. At the same time, under the influence of the load 13, the arc bracket 16 is mixed together with the sphere 11 due to the degree of freedom of rotation of the axes 17 in the stationary radial and support bearings 18, 19. A pair of brake olodok 8 covers the area without touching symmetrically relative to the center ne.

Thus, in an orthogonal installation, the X and Y seismic detectors occupy a horizontal position, and the vertical seismic receiver — a vertical position at any inclination of the device in the well under study, after which the brake pads 8 are fixed. in this case with respect to the pressure lever 2

The use of a device characterized by simplicity of design and reliability, as part of multi-instrument probes, provides an increase in the accuracy of the VSP research results on deep and ultra-deep wells of any, tilt

The same orientation of the fixing devices in the docking nodes ensures the same orientation of the devices in the probe, which ensures the implementation of an effective and efficient VSP method

determining the orientation of the seismic record in the study of wells with any slope. Excited in near-well space seismic

Signals are received in the test well in a unidirectional orthogonal system by continuously registering a probe with the described construction. At the same time, at the points of correlation overlap, the modulus of the vertical component of the previous observation is compared with the modulus of the same name of the next observation, which theoretically should be equal, and according to the results of comparison

the magnitudes of the moduli of the self-isolated components of the follow-up change proportionally. By the ratio of the modules and directions of the corrected horizontal components at the point of correlation overlap, the relative orientation of the system positions to a number of located observation positions is determined. According to the orientation data, seismic records obtained in different observation planes are converted into a single VSP plane for analyzing the wave field and structural near-wellbore space.

Based on the results

observation creates the possibility of operational control of directional drilling.

Claims (2)

1. Device of a three-component probe vertical seismic profiling comprising a lever-type clamping device and a hermetic case with orthogonal installation of seismic receivers in articulated suspensions with a braking system, differing in hem, that, in order to increase the reliability and accuracy of the device in inclined wells, the installation of seismic receivers is orthogonal mounted on the chassis and oriented to a given element of the device, the articulated hanger of each seismic receiver consists of an arc bracket and a centrally rotating sphere. The arc bracket has a length arc of at least half the circumference, and its axis of rotation is aligned with the axis of rotation of the bearings mounted coaxially on the chassis and in the arc bracket, in the centrally rotating sphere, oriented vertically by a connected load, fixed seismic receiver. The central rotating sphere has supports and guides along an arc bracket in the form of pairs of bearings located symmetrically about an axis passing through a geometrical center of sphere and center of body of attached cargo. 2. The device according to claim. 1, characterized in order. that the brake system consists of three pairs of clamping pads installed in the housing of the device on the t-lever the mechanism is symmetrical with respect to the geometric centers of the spheres of the hinged suspensions, the diameter of the brake surfaces of the pads being equal to the diameter of the spheres, and the material of the pads forms a friction pair with the material of the sphere, figure 1 9