STUCK PIPE FREEING WORKSHEET FREEING WELLBORE GEOMETRY
STUCK PIPE MECHANISM PIPE MOTION PRIOR TO STICKING ?
PACK-OFF / BRIDGE
DIFFERE FERENT NTIIAL
WELLBOR LBORE E GEOMETRY
Moving up Rotating up Moving Down Rotating Down Static
2 0 1 0 2
0 0 0 0 2
2 2 2 2 0
1. If stic stickin king g occurr occurred ed whil whilee moving moving up, up, appl apply y torque and jar DOWN with max. trip load
0 1 0
0 0 0
2 2 0
3. Stop Stop or reduc reducee circul circulat ation ion whe when n cockin cocking g the jar and when jarring down. NOTE : Pump pressure will INCREASE the hydraulic jar up-blow, DECREASE the down -blow
4.
0 2 0
0 0 0
2 2 0
5. Conti Continue nue jarr jarring ing unt until il the the string string is is free free or an alternative decision is made. Jarring for 10+ hours may be necessary.
6.
0 2 2
2 0 0
2 0 0
INITIAL ACTION : 2.
If sticking occurred while moving down, do not apply torque and jar UP with max. trip load
PIPE MOTION AFTER STICKING? Down Free Down Restricted Down Impossible
PIPE ROTATION AFTER STICKING ? Rotate Free Rotate Restricted Rotate Impossible
CIRC. PRESSURE AFTER STICKING? Circulation Free Circulation Restricted Circulation Impossible
TOTALS INSTRUCTIONS
:
Answer the shaded questions by circling all the numbers in the row with the correct answer.
SECONDARY ACTION : Spot acid if stuck in Limestone or Chalk. Spot fresh water with mobile Salt WHEN THE STRING COMES FREE : 7. Increas Increasee circul circulati ation on to max. rate, rate, rota rotate te and and work the string. 2. 3.
Ream Ream / back back ream ream the hole hole sect section ion thoro thorough ughly ly.. Circ Circul ulat atee the the hol holee clea clean. n.
8.
4.
Add the columns, the column with the highest number indicates the sticking mechanism.
FREEING PACK-OFF / BRIDGE STUCK WHILE MOVING UP or WITH STRING STATIC ACTION TO ESTABLISH CIRC. : 1. Apply Apply low low pum pump p pres pressur suree (200 (200 -400) -400) psi. Maintain pressure if restricted circulation is possible
STUCK WHILE MOVING DOWN ACTION TO ESTABLISH CIRC. : 5. Appl Apply y low low pump pump pressu pressure re (200 (200 - 400) 400) psi. Maintain pressure if restricted circulation is possible.
2.
6.
3.
DO NOT NOT JAR JAR UP! UP!!! APPL APPLY Y TORQUE!!! Slack-off to MAXIMUM set down weight. Allow sufficient time for a hydraulic jar to trip (4-6 min. for long cycle, see jar manual)... If the the stri string ng doe doess not not come come free, free, DO DO NOT JAR UP!!! Jar DOWN until the string comes free or an alternative decision is made. Jarring down for 10+ hours may be necessary.
7.
DO NOT NOT JAR JAR DOWN DOWN!! !!!! APPL APPLY Y TORQUE!!! Apply MAXIMUM overpull to jar. Allow sufficient time for a hydraulic jar to trip (4 8 min. for long cycle, see jar manual). If the the stri string ng does does not come come fre free, e, DO DO NOT JAR DOWN!!! Jar up until the string is free or an alternative decision decision is made. Jarring up for 10+ hours may be required.
7. WHEN CIRC. IS ESTABLISHED :
WHEN CIRC. IS ESTABLISHED :
4.
8.
5. 6.
Slow Slowly ly incr increas easee pump pump spee speed d to to maximum rate. When possible, work the string and circulate circulate the hole clean form bit depth. Ream Ream the the sec sectio tion n unti untill the the hole hole is is clean If POO POOH H to to log log and/ and/or or run run cas casing ing,, return to bottom & circ.. hole clean.
Slow Slowly ly increa increase se pum pump p spee speed d to to max. max. rate. When possible, work the string and circulate the hole clean from bit depth. 9. Ream Ream the the sec secti tion on unti untill the the hole hole is is clean. 10. Continu Continuee RIH until until excessi excessive ve set down down weight is observed, circ. hole clean.
FREEING DIFFERENTIAL STICKING INITIAL ACTION : 1. Circ Circula ulate te at at maxim maximum um allo allowa wable ble rat ratee 2. Work Work MAX MAXIM IMUM UM limi limitt torq torque ue down down to the stuck depth and hold the torque in the string. 3. Stop Stop or or red reduc ucee pum pump p spee speed d to to minimum. 4. Slac Slack-o k-off ff MAX. MAX. set set dow down n limi limitt !
5.
Allo Allow w suffi suffici cient ent tim timee for a hyd hydrau rauli licc jar to trip (4 - 6 min. for long cycle, see jar manual ). 6. If the the str string ing doe doess not not come come free free,, hold hold torque in the string and continue jarring down with max. trip load. SECONDARY ACTION : If the string does not come free after 5 to 10 jars blows, continue jarring while preparing a pipe releasing pill. WHEN THE STRING IS FREE : 8. Rota Rotate te & wor work k the the stri string ng.. 9. Circ Circ.. at max max.. rate rate to to clea clean n the the hole hole.. 10. Check Check the proper proper mud mud specific specificatio ations. ns.
STUCK PIPE FREEING EXERCISE
1.
The drill string was found stuck when pulling off the slips after a connection. The string is totally immobilized. Circulation is impossible.
a. What is the sticking mechanism mechanism? ?
b. What is the first action to free the the drill string?
c. What is the the cause cause of the sticking mechanism? mechanism?
2.
Whil While e runn runnin ing g in the the hol hole e wit with h an an ang angle le hol holdi ding ng BHA BHA,, the the drill string became stuck with the bit 55 feet below the bottom of the tangent. The drill string is totally immobilized. Circulation is unrestricted. unrestricted. a. What is the sticking mechanism mechanism? ?
b. What is the first action to free the the drill string?
c. What is the the cause cause of the sticking mechanism? mechanism?
NAME _________________________________________
WHILE DRILLING AT 9,695’ THE RIG LOST POWER. THIRTY SIX HOURS LATER THE POWER WAS RESTORED ONLY TO FIND THAT “WE’RE STUCK” . YOU’RE TOLD THAT WE NEED TO ORDER ENOUGH SPOT TO COVER THE DRILL COLLARS AND THE HEAVY-WATE HEAVY-WATE , AND LEAVE TWENTY-FIVE BARRELS OF SPOT IN THE DRILL-STRING. WHAT WOULD YOU ORDER? ________________________ ____________ _________________________ __________________________ _____________ GIVEN:
MW= 12.5 ppg ,
S.G. OF SPOTTING MATERIAL= 1.02 , AND COMES IN 25 bbl TANKS.
WEIGHT MATERIAL IS BARITE , MUD IS A DISPERSED DISPERSED SPERSENE SPERSENE / XP-20 SYSTEM. SURFACE CASING IS 10.75” X 10.050” 40.5 #/ft AND IS IS SET AT 3,280’. BIT IS 9.875” DRILL COLLARS = 7. 7.25” X 2.8125” HEVI-WATE = 5.0” X 3.0” DRILL PIPE = 5.0” X 4.276” PUMP OUTPUT = .102 bbls / stk
CAP.= .0 .00768 CAP.= .00874 CAP.= .01776
LENGTH = 18 185’ LENGTH = 910’
1.
HOW HOW MAN MANY Y STR STROK OKES ES WOUL WOULD D IT IT TAK TAKE E TO TO GET GET THE THE SPO SPOT T IN IN PLA PLACE CE? ? ______________.
2.
WHERE WOULD TH THE TO TOP OF OF TH THE SP SPOT BE BE ? ______________________ __________________________________ _________________. _____.
3.
IF THE THE SPOT SPOT WAS WAS UNW UNWEI EIGH GHTE TED, D, HOW HOW MUC MUCH H PRE PRESS SSUR URE E WOUL WOULD D WE WE SEE SEE , AND AND WHERE WOULD WE SEE IT ? ( AFTER THE SPOT WAS IN PLACE ) _____________ _______________________________________________________________________ ______________________ __________________________________ ________________________ _________________________ ________________________ ____________. _.
DRAW A PICTURE AND SHOW ALL WORK !
