SU1594470A1 - Source of seismic signals of pulsed action - Google Patents

Abstract

The invention relates to devices for driving seismic signals for seismic prospecting for oil and gas. The purpose of the invention is to increase the seismic efficiency when radiation signals in the process of movement. The source of seismic signals of a pulsed action contains a vehicle with two radiators placed on it with supporting elements. The emitters are mounted for movement along the longitudinal axis of the vehicle, from a displacement drive mounted thereon in the form of hydraulic cylinders, the rods of which are fixed on the radiators. The distance between the radiators or their groups depends on the speed of the source, determined by the corresponding sensor. Soil compaction is performed by one or two radiators located in the front part of the driving vehicle, and sending a seismic signal to the compacted soil after a constant period of time - radiators, located in the rear part of the vehicle. 1 il.

Description

The invention relates to a device for exciting seismic signals for seismic prospecting for oil and gas.

The purpose of the invention is to increase the seismic efficiency when radiation signals in the process of movement.

The picture shows the proposed source.

The source consists of a trailed vehicle I, made in the body of the body 2, mounted on.

platform 3, on which the axles of the vehicle 1 are guided 4; on the rollers 4 located in the guides 4 of the rollers 5, the carriage 6 is mounted, on which the emitters 7 and 8 are fixed with the support elements 9 and 10 made in the form of runners. On the platform 3 The drive 11 is mounted. The displacement of the emitters 7 and 8. The drive 11 is made in the form of a double-porosity. The hydraulic cylinders, the rods 12 and 13 of which are connected to the carriages 6, The drawing shows only two radiators, but they can be several (even number) combined into two groups, with each radiator from one corpse being connected by a hydraulic cylinder with one radiator another group

On platform 3, a power supply system 14 is installed, connected by lines 15 and 16 through a first control valve 17 with radiators

7 and 8. The platform 3 is vibrated from the undercarriage by 18 pneumatic supports 19.

8 body 2 placed control system 20 which includes a connected line 21 with a command device

22 sensor 23 vehicle speeds. Command unit: unit 22 is connected by line 24 to the first control unit 1M distributor 17, line 25 is connected to the second control No. 1m distributor 26, through which the central cavity of the hydraulic cylinder of the drive 11 is connected by lines 27-29 to sources 30 and 31 excess and low pressure, respectively.

The source works as follows.

Vehicle I is continuously traveling along the profile. Sensor

23, the motion speed V sends signals to the command device 22, controlling the position of the emitters 7 and 8 with the reference element) ffl 9 and 10,

An external trigger (seismic station — not shown) generates two trigger pulses,

On the first of the signals, the command device 22 provides the connections with the distributor 17 of the radiator 7, having the supporting element 9, with the power supply system 14 — the soil is being fed, the second device (through time At) the command device 22 provides the connection of the distributor 17 of the radiator B to the supporting element 10 s power supply system 14 transmits a signal to a pre-compacted bay,

The time interval A t between saitycK & th pulses is constant and entered into the circuit of the command device 22 as a constant coefficient K,

The command device 22 generates an output signal based on the readings of the speed sensor 23 according to the formula where g S is the distance between the geometric centers of the groups of supporting elements; K - coefficient of proportionality, equal in size to the interval At,

The signal from the command device 22, supplied to the distributor 26, connects sources of increased 30 or reduced pressure to the hydraulic cylinder slots of the actuator 11, which makes it possible to achieve the required distance V between the geometric centers of the groups of support elements (., Elements 9 and 10), The supporting elements are adapted to contact with each other.

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Claims (1)

The invention The source of seismic signals of pulsed action, including the vehicle on which it is located. a power supply system, including a hydraulic system and a control system, connected to the power supply system, a radiating element and a soil compaction device having supporting elements connected to the radiators, mounted along the vehicle, characterized in that, c. In order to increase seismic efficiency when radiation signals are in motion, the soil compaction device and the radiating element are made in two groups, while the radiators from different groups are connected in pairs to each other, and their movement along the longitudinal axis of the vehicle is driven by - tsdshndrov, the cavities of which through the distributor are connected with the sources of high and low pressure of the hydraulic system, the rods of the hydraulic cylinders are rigidly fixed on the radiators, at the same time the limiter is connected to the control system into which the command device with the vehicle speed sensor is input. 1 2 20 2P2 30 3128 29 26 III hII II IB 19 49 576 12 77 3 8 Ю 3 18 W