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DROP GYRO SURVEY PROCEDURE
EQUIPMENT REQUIRED RSG-DP (Rate Gyroscopic Surveyor – Drop S ystem) 1 ¾” Battery Gyro running gear. PERSONNEL REQUIRED (2) 2 Survey Engineers PRE JOB REQUIREMENTS 1.
No back reaming reaming while while pulling pulling out out of hole, hole, pipe pipe rotation rotation limite limited d to 15 15 rpm.
2.
Mud data and down down hole assembly assembly sheets, sheets, includi including ng position position of Totco Totco or equipment equipment to land land out on.
3.
Detai Details ls of of mud pum pump p arrang arrangem ement ent..
RUNNING PROCEDURE 1.
In consultation consultation with with the Mud Engineer Engineer and Company Company Represen Representative, tative, prior prior to starti starting ng the job, calculat calculate e a pumping procedure as detailed in Appendix A.
2.
Make Make up Gyro Gyro and Drop Drop System System on catw catwalk alk and and functio function n test. test.
3.
Perfor Perform m a rig site site roll roll test test if if condit condition ions s permit permit..
4.
Prior to picking up tool, pump the high viscosity pill.
5.
Pick up tool tool on tugger, ensuring ensuring the tool tool is full supporte supported d along its length length and land off in drill drill pipe pipe on the landing plate. If running 1 ¾” equipment ensure the decelerator piston retaining pin is in place when picking up. Remove the pin, exercising caution, only when the tool is vertical.
6.
Remove lifting cap and install fishing neck. Drop tool. (Ensure drill pipe full of fluid prior to dropping).
7.
Bring the the pumps up slowly slowly to the the required required stroke stroke rate in order order to keep the tool tool moving moving at a speed of of 150ft/min 150ft/min (45 m/min). The pipe should be rotated (max 15 rpm) and worked during the entire drop. Monitor pump pressure for kicks, if any are seen this may indicate the tool has hung up rather than landed out early. If tool hang up is suspected, increase the pump rates for short time. Take care not to exceed the number of strokes calculated for 80% of pipe volume.
8.
Keep pumping pumping until 80% 80% of the drill pipe pipe volume volume has been displace displaced. d. If required, required, a sweep sweep slug may be pumped pumped at any time during this procedure.
9.
Cut the pump rate rate to a minimu minimum m and pump the remaini remaining ng pipe volum volume e and the BHA volume. volume. Check Check with the driller for any back-pressure. Allow a safety factor of an extra 10 minutes pumping if one is not seen.
10. Once the tool has landed out, take a 6 station shots at TD.
11. When back on surface fit the decelerator piston’s retaining pin before before laying down down tool. 12. Perform Perform a rig site roll test test if conditions conditions permit. permit. 13. Thoroughly Thoroughly clean all running running gear whilst whilst downloadi downloading ng data. 14. Process Process and present the survey, survey, applying applying SAG corrections corrections as required. required.
DROP GYRO SURVEY PROCEDURE
Appendix A – Pumping Regime Safety factor
:
0.6
FIRST STAGE PUMPING (pumping section drillpipe to BHA) Stroke Rate = 15 Stroke/Min Number of strokes =195 Strokes Estimated pumping time first stage = ___13_____Minutes Monitor pump pressure for kicks, if any are seen this may indicate the tool has hung up rather than landed out early. If tool hang up is suspected rotate the pipe and increase the pump rates for a short time. Be careful not to exceed the total number of strokes calculated at higher pump rates. SECOND STAGE PUMPING (pumping section BHA) Pump volume of BHA at minimum pump rate. Shut off pumps and commence survey if pressure kick is seen. If no pressure kick is seen continue pumping for a further 10 min, or until the total down hole assembly volume has been pumped. Stroke Rate = 6 Stroke/Min Number of strokes = 54 Strokes Estimated pumping time second stage = __9____Minutes Total amount of strokes pumped = ___249___Strokes Total estimated pumping time (first and second stage) = ____22____Minutes GENERAL To reduce rig time the tool may be dropped and pumped whilst still circulating bottoms up after TD is reached, provided the calculated stroke is not exceeded. A sweep slug, if required can also be added during the latter part of this pumping regime. The pipe may be worked and rotate at 15 rpm during tool decent. This may reduce possibility of the tool hanging up during the drop. Be careful not to activate the jars during this process. Back reaming is not permitted with the tool in BHA as severe damage is likely to be incurred. If possible the tool must be recovered to surface prior to jarring or back reaming if hole problems are encountered. If the required pump rate cannot be achieved, the cement pump may be used with approval from the company representative
