Bore hole seismic transducer

Claim 2

A vibrator adapted to be lowered in a well bore comprising an elongated housing having a diameter less than the diameter of said well bore, said housing including therein a hydraulic booster, a hydraulic amplifier operationally connected to said hydraulic booster and an electrically controlled servo valve having its output coupled to said hydraulic amplifier; hydraulic pump means; line means connected between said pump means and the hydraulic ports of said servo valve to communicate hydraulic fluid to and from said valve; means for communicating hydraulic fluid to said hydraulic booster; valve means imposed in said last-mentioned communication means for remotely closing and opening said communication means; vibrator means mounted to said housing and normal to the axis of said elongated housing, said vibrator means comprising first and second pistons; and means for communicating the output from said hydraulic booster between said first and second pistons.

Claim 3

A device as described in claim 1 including expandable packer means surrounding said housing and means for expanding said packer and deflating said packer whereby said vibrator may be lowered into a well bore and said packer expanded against the walls of said well bore to secure said vibrator in position and when said packer is deflated said vibrator may be removed from said well bore.

Claim 4

A device as described in claim 1 wherein said means for remotely controlling said valve means comprises a source of electricity and a switch and means for connecting said source of electricity to said valve.

Claim 5

A device as described in claim 2 wherein said means for expanding said packer and for deflating said packer comprise a source of gas, conduit means connecting said source of gas to said packer, a first valve means interposed in said conduit means, and a second valve connected between said conduit means and the environment, whereby, when said second valve is closed and said first valve is opened, gas will be applied to said bellows and, when said first valve is closed and said second valve is opened, the gas within said bellows will be permitted to escape to said environment.

Claim 6

A device as described in claim 1 wherein said vibrator includes at least one driving piston and two driven pistons.

Claim 7

In a seismic vibRator having a power hydraulic piston, an improvement comprising a hydraulic booster system for said power hydraulic piston comprising an elongated housing, a plurality of cylindrical chambers formed in said housing, said plurality of cylindrical chambers comprising a first and second set, each of which is aligned along the axis of the housing and each cylindrical chamber being axially oriented; a piston shaft means mounted in communication with each of said cylindrical chambers, the axis of said piston shaft falling along the axis of said chambers; piston means mounted on said piston shaft and in each of said cylindrical chambers, each piston means secured to said piston shaft so that the piston occupies the same position in each of said chambers; servo control means having a pair of outputs, said pair of outputs communicating with opposite ends of said first set of said cylindrical chambers; means for communicating the same end of said second set of said cylindrical chambers of an output whereby operation of said servo control means will force the pistons in said first set of cylindrical chambers toward one end and then the opposite end of said cylindrical chambers, causing said piston shaft to move the pistons in said second set of cylindrical chambers, resulting in alternate compression and decompression of hydraulic fluid in said second set of cylindrical chambers, said alternating compression and decompression being exhibited at the output of said second set of cylindrical chambers.

Claim 8

In a seismic vibRator having a power hydraulic piston, an improvement comprising a hydraulic booster system for said power hydraulic piston comprising an elongated housing, a plurality of cylindrical chambers formed in said housing, said plurality of cylindrical chambers comprising a first and second set, each of which is aligned along the axis of the housing and each cylindrical chamber being axially oriented; a piston shaft means mounted in communication with each of said cylindrical chambers, the axis of said piston shaft falling along the axis of said chambers; piston means mounted on said piston shaft and in each of said cylindrical chambers, each piston means secured to said piston shaft so that the piston occupies the same position in each of said chambers; servo control means having a pair of outputs, said pair of outputs communicating with opposite ends of said first set of said cylindrical chambers; means for communicating the same end of said second set of said cylindrical chambers of an output whereby operation of said servo control means will force the pistons in said first set of cylindrical chambers toward one end and then the opposite end of said cylindrical chambers, causing said piston shaft to move the pistons in said second set of cylindrical chambers, resulting in alternate compression and decompression of hydraulic fluid in said second set of cylindrical chambers, said alternating compression and decompression being exhibited at the output of said second set of cylindrical chambers.

Claim 9

Means for biasing a hydraulically controlled vibrator which generates a continuous frequency signal of predetermined frequency and time duration against a bore hole wall comprising a housing; a vibrator comprising a piston having a first and second face; means for mounting said piston to said housing so that said first and second face is normal to said housing; hydraulic means communicating with said piston such that when said hydraulic fluid is forced into said piston said first and second face will be forceably biased against said bore hole wall; and means for retaining said hydraulic fluid under pressure in said piston.

Claim 10

Means for biasing a hydraulically controlled vibrator which generates a continuous frequency signal of predetermined frequency and time duration against a bore hole wall comprising a housing; a vibrator comprising a piston having a first and second face; means for mounting said piston to said housing so that said first and second face is normal to said housing; hydraulic means communicating with said piston such that when said hydraulic fluid is forced into said piston said first and second face will be forceably biased against said bore hole wall; and means for retaining said hydraulic fluid under pressure in said piston.