Downhole recorder device for logging boreholes

Claim 2

Method of logging a cased borehole wherein a logging tool and a recorder device are connected together and placed within a probe with the probe being supported on a slick-line and moved through the borehole, comprising the steps of: 1. moving the probe through the borehole at a constant rate of travel by controlling the speed of the slick-line from the surface of the earth; 2. continuously detecting radiation emitted from formations adjacent to the traveling probe; 3. producing a radioactive logging signal which is proportional to the radiation detected in step (2); 4. recording the logging signal of step (3) on the recorder located within the probe; 5. simultaneously detecting and recording the presence of collars located within the borehole while carrying out step (1) so that the collars can be used to subsequently index the signal of step (4) with borehole elevation; 6. removing the probe from the borehole; 7. changing the recorded signal of step (4) into a visually observable log by correlating therewith the speed of the slickline of step (1) and the location of the collars of step (5).

Claim 3

Method of logging a cased borehole wherein a logging tool and a recorder device are connected together and placed within a probe with the probe being supported on a slick-line and moved through the borehole, comprising the steps of:

Claim 4

Method of logging a cased borehole wherein a logging tool and a recorder device are connected together and placed within a probe with the probe being supported on a slick-line and moved through the borehole, comprising the steps of:

Claim 5

moving the probe through the borehole at a constant rate of travel by controlling the speed of the slick-line from the surface of the earth;

Claim 6

moving the probe through the borehole at a constant rate of travel by controlling the speed of the slick-line from the surface of the earth;

Claim 7

continuously detecting radiation emitted from formations adjacent to the traveling probe;

Claim 8

continuously detecting radiation emitted from formations adjacent to the traveling probe;

Claim 9

The method of claim 1, and further including the step of:

Claim 10

The method of claim 1 wherein step (5) is carried out according to the following steps: 5a. changing the tension in the slick-line by releasably engaging the collars of the borehole with the probe; 5b. continuously measuring the tension in the slick-line; 5c. using the increased tension in the slick-line as a signal which indicates the presence of a collar.

Claim 11

producing a radioactive logging signal which is proportional to the radiation detected in step (2);

Claim 12

producing a radioactive logging signal which is proportional to the radiation detected in step (2);

Claim 13

recording the logging signal of step (3) on the recorder located within the probe;

Claim 14

recording the logging signal of step (3) on the recorder located within the probe;

Claim 15

The method of claim 3 and further including the step of:

Claim 16

The method of claim 1 wherein the probe is lowered to the bottom of the hole and the recorder is energized upon the probe being moved uphole.

Claim 17

simultaneously detecting and recording the presence of collars located within the borehole while carrying out step (1) so that the collars can be used to subsequently index the signal of step (4) with borehole elevation;

Claim 18

simultaneously detecting and recording the presence of collars located within the borehole while carrying out step (1) so that the collars can be used to subsequently index the signal of step (4) with borehole elevation;

Claim 19

removing the probe from the borehole;

Claim 20

removing the probe from the borehole;

Claim 21

The method of claim 1 wherein the probe is lowered to the bottom of the hole and the recorder is energized upon the probe being moved uphole.

Claim 22

A downhole logging apparatus for analyzing structure forming a borehole comprising: a recorder means for recording electrical signals, a measuring means for measuring the characteristics of the earths strata through which the borehole extends; a source of power; a switch means which can be moved from one position to another position; means forming a housing within which said recorder means, said measuring means, and said power source are hermetically sealed; support means, including a slick-line, for supporting said housing from within the borehole; circuit means connecting together said source of power; said switch means, said recorder means and said measuring means; said switch means being connected to cause said recorder means to record signals generated by said measuring means when moved to one position, and to prevent said recorder means from recording signals when moved to another position; switch actuated means; said switch actuating means including a drag means reciprocatingly captured on said housing and adapted to engage a side wall of the borehole; means connected to said drag means for causing said switch means to move from said one position to said another position in response to reciprocal movement of said drag means.

Claim 23

A downhole logging apparatus for analyzing structure forming a borehole comprising: a recorder means for recording electrical signals, a measuring means for measuring the characteristics of the earths strata through which the borehole extends; a source of power; a switch means which can be moved from one position to another position; means forming a housing within which said recorder means, said measuring means, and said power source are hermetically sealed; support means, including a slick-line, for supporting said housing from within the borehole; circuit means connecting together said source of power; said switch means, said recorder means and said measuring means; said switch means being connected to cause said recorder means to record signals generated by said measuring means when moved to one position, and to prevent said recorder means from recording signals when moved to another position; switch actuated means; said switch actuating means including a drag means reciprocatingly captured on said housing and adapted to engage a side wall of the borehole; means connected to said drag means for causing said switch means to move from said one position to said another position in response to reciprocal movement of said drag means.

Claim 24

changing the recorded signal of step (4) into a visually observable log by correlating therewith the speed of the slick-line of step (1) and the location of the collars of step (5).

Claim 25

changing the recorded signal of step (4) into a visually observable log by correlating therewith the speed of the slick-line of step (1) and the location of the collars of step (5).

Claim 26

The apparatus of claim 6, wherein said drag means includes a centralizer, a magnet means connected to said centralizer; said switch means being magnetically actuated; whereby, when said magneT means of said centralizer is reciprocatingly moved into close proximity of said magnetically actuated switch means, said switch means is moved from said another position to said one position.

Claim 27

correlating the log obtained in step (7) with an open hole log of the borehole so as to index the open hole log with the collars of the cased borehole.

Claim 28

correlating the log obtained in step (7) with an open hole log of the borehole so as to index the open hole log with the collars of the cased borehole.

Claim 29

correlating the log obtained in step (7) with an open hole log of the borehole so as to index the open hole log with the collars of the cased borehole.

Claim 30

correlating the log obtained in step (7) with an open hole log of the borehole so as to index the open hole log with the collars of the cased borehole.