1. A disk drive device comprising:
a disk;
a head to access the disk;
a channel circuit to decode read signals reproduced from the disk by the head;
a first circuit utilized in sensing a first temperature in an enclosure;
a second circuit utilized in sensing a second temperature in a vicinity of the channel circuit; and
a controller to perform a compensation of a parameter in processing the read signals in the channel circuit using the first temperature and the second temperature, and to measure a clearance between the head and the disk using the compensated parameter.
2. The disk drive device according to claim 1, wherein the controller compensates for variation in the parameter corresponding to a temperature change of frequency property of the channel circuit by the compensation of the parameter.
3. The disk drive device according to claim 2, wherein a coefficient to be used in the compensation of the parameter is determined by a test under at least two temperature conditions.
4. The disk drive device according to claim 2, wherein the parameter is a parameter representing resolution of the signals reproduced from the disk by the head.
5. The disk drive device according to claim 1, wherein the parameter is a parameter in digital signal processing in the channel circuit.
6. The disk drive device according to claim 1, wherein the controller determines the second temperature using an output of the second circuit and a preset function.
7. The disk drive device according to claim 6, wherein
the second circuit comprises a channel oscillator; and
the output of the second circuit comprises an oscillation frequency of the channel oscillator.
8. A disk drive device comprising:
a disk;
a head accessing the disk;
a channel circuit decoding read signals reproduced from the disk by the head;
a first circuit utilized in sensing a first temperature in an enclosure;
a second circuit utilized in sensing a second temperature in a vicinity of the channel circuit; and
a controller performing a compensation of a parameter in processing the read signals in the channel circuit using the first temperature and the second temperature and to measure barometric pressure using the compensated parameter.
9. The disk drive device according to claim 8, wherein the controller compensates for variation in the parameter corresponding to a temperature change of frequency property of the channel circuit by the compensation of the parameter.
10. The disk drive device according to claim 9, wherein a coefficient to be used in the compensation of the parameter is determined by a test under at least two temperature conditions.
11. The disk drive device according to claim 9, wherein the parameter is a parameter representing resolution of the signals reproduced from the disk by the head.
12. The disk drive device according to claim 8, wherein the parameter is a parameter in digital signal processing in the channel circuit.
13. The disk drive device according to claim 8, wherein the controller determines the second temperature using an output of the second circuit and a preset function.
14. The disk drive device according to claim 13, wherein
the second circuit comprises a channel oscillator; and
the output of the second circuit comprises an oscillation frequency of the channel oscillator.
15. A disk drive device comprising:
a disk;
a head equipped with a heater for accessing the disk;
a channel circuit decoding read signals reproduced from the disk by the head;
a first circuit utilized in sensing a first temperature in an enclosure;
a second circuit utilized in sensing a second temperature in the vicinity of the channel circuit; and
a controller performing a compensation of a parameter in processing the read signals in the channel circuit using the first temperature and the second temperature and determining a heater power to be supplied to the heater when the head accesses the disk based on a barometric pressure which was measured by use of the compensated parameter.
16. The disk drive device according to claim 15, wherein the controller compensates for variation in the parameter corresponding to a temperature change of frequency property of the channel circuit by the compensation of the parameter.
17. The disk drive device according to claim 16, wherein a coefficient to be used in the compensation of the parameter is determined by a test under at least two temperature conditions.
18. The disk drive device according to claim 16, wherein the parameter is a parameter representing resolution of the signals reproduced from the disk by the head.
19. The disk drive device according to claim 15, wherein the parameter is a parameter in digital signal processing in the channel circuit.
20. The disk drive device according to claim 15, wherein the controller determines the second temperature using an output of the second circuit and a preset function.
21. The disk drive device according to claim 20, wherein
the second circuit comprises a channel oscillator; and
the output of the second circuit comprises an oscillation frequency of the channel oscillator.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
We claim:
1) A method of using an inner sleeve, slidably disposed within an outer housing adapted to connect to a Christmas tree located at a wellhead of a well located subsea, the outer housing further comprising a lubricator assembly, the inner sleeve further adapted to be displaceable within at least a portion of the Christmas tree, the inner sleeve further comprising a conduit through a predetermined length of the inner sleeve, the wellhead having a control line connected to the wellhead, the method comprising:
a. positioning a vessel proximate the wellhead;
b. lowering the outer housing to a position proximate the wellhead;
c. coupling the outer housing to the Christmas tree;
d. lowering the inner sleeve into a predetermined position within the outer housing, the position at least partially extending proximate a tubing hanger associated with the Christmas tree;
e. introducing fluids through a fluid line operatively in communication with the inner sleeve, the fluids passing through the conduit within the inner sleeve; and
f. retrieving the outer housing upon completion of fluid introduction into the well.
2) The method of claim 1 wherein, once deployed into the Christmas tree, the inner sleeve extends from proximate a first opening in the Christmas tree to a predetermined second position in an interior of the well that is past the Christmas tree at the point of junction between the Christmas tree and the wellhead, whereby the inner sleeve extends from a lowermost blowout preventer past the Christmas tree and into a tubing hanger.
3) The method of claim 1 wherein the fluid comprises at least one of circulating well fluids, well treating fluids, and cement.
4) The method of claim 1 wherein step (f) further comprises:
i. retracting the inner sleeve into the outer housing upon completion of fluid introduction into the well; and
ii. retrieving the inner sleeve concurrently with retrieving the outer housing.
5) The method of claim 1 wherein in step (d) further comprises lowering the inner sleeve from the vessel using a wireline.
6) The method of claim 1 wherein step (d) further comprises:
i. connecting a pump to the lubricator assembly with a fluid line; and
ii. lowering the inner sleeve into the Christmas tree by using pressure supplied by the pump.
7) The method of claim 1 wherein step (d) further comprises lowering the inner sleeve into the tree by using a wireline.
8) The method of claim 1 wherein step (d) further comprises:
a. seating the inner sleeve in the outer housing;
b. positioning the inner sleeve into a predetermined position relative to the Christmas tree; and
c. protecting tree internals from contaminants by using the inner sleeve.
9) The method of claim 1 wherein a wireline is used to set and retrieve the inner sleeve.
10) The method of claim 1 wherein pressure is used to set and retrieve the inner sleeve.
11) The method of claim 1 wherein, once deployed into the Christmas tree, the inner sleeve extends from proximate a first opening in the Christmas tree to a predetermined second position in an interior of the well that is past the Christmas tree at the point of junction between the Christmas tree and the wellhead, whereby the inner sleeve extends from a lowermost blowout prevention device past the Christmas tree and into a tubing hanger.
12) The method of claim 1 wherein the fluid comprises at least one of circulating well fluids, well treating fluids, and cement.
13) A tree saver system for operations involving subsea Christmas trees, comprising:
a. an outer housing having a first end and a second end, the outer housing defining a chamber therein;
b. a lubricator assembly disposed within the outer housing;
c. an inner sleeve slidably disposed within the chamber, the inner sleeve comprising an inner conduit; and
d. a sleeve mover to move the sleeve the within the chamber to a predetermined position proximate a tubing hanger associated with the Christmas tree;
e. wherein
i. the first end is adapted for coupling to a Christmas tree, and
ii. the second end is adapted for receiving a line.
14) The system of claim 13 wherein the line comprises at least one of wirelines and flow lines.
15) The system of claim 13 wherein the inner sleeve is substantially tubular.
16) The system of claim 13 further comprising a seal disposed in an interior of the outer housing proximate the second end, the seal adapted to travel with the inner sleeve and seal against the outer housing.