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Makr hr 2 Novemberwe reentered the hole and ran to Using the Tensor electronic multishot tool we conducted a wireline drift survey from maje Bottom hole make up tool measurements were made at m hoole, and a hole deviation of 4. Upon completing the survey, we began coring Core BR from While cutting Core BR, we noted a drop in circulating pressure of psi and assumed that the RCB bit seal had failed. Although the holw continued to recover gauge core and advanced at a respectable penetration rate, we decided to again hp conservative and pull the bit after We halted coring after recovering Core B R to The bit arrived at the rig floor by hr 5 November Just as on earlier bit runs, we found the bit to be in good condition with no sign of eminent catastrophic failure.
As expected the internal cutter wear was slightly more Botttom than on previous bits, with the inner nose row of carbide buttons completely worn back into Bottom hole make up tool matrix material and both of the two opposite cutters with three carbide inserts each ,ake found worn back to the matrix material. Slight wear Bottom hole make up tool evident at the tip of the core uup. Bearing seals were considered effective and bearing condition was actually slightly better tighter than that of the previous bit. With the fourth bit, we cored Core Bit Number 5-First Deployment During the previous bit run, we rebuilt the final remaining set of drilling jars and added packing to the seal chamber.
The jars passed a pressure test of psi for 10 min and were judged acceptable for use. A new C-7 core bit was made up and after 15 min we made yet another routine reentry at hr 5 Gole We were tripping the bit to bottom when it encountered a hard maoe at a depth of mbsf. After picking up ohle top drive, we again encountered an obstruction, this time at The top drive repeatedly stalled out with little or no WOB each time it contacted the obstruction. After deliberation, we decided that we yole be more successful using a more nole tricone drill bit, so the drill string was recovered back to the rig floor by hr that same day.
We reentered the hole at hr 5 November 15 min reentryand the pipe was RIH tagging the obstruction at the same depth as before Top drive stalling continued to be a problem during our attempts to clear the bridge. This was aggravated by significant heave resulting yole long period swells generated by a significant low pressure cell some 80 km to the south of the BBottom location. All total, in less than an hour, we had cleared the hole once again. Top drive stalling torques of amps and overpulls of up to 60K lb were experienced during the episode. We theorized that an angular piece of material must have sloughed off of the side of the hole leaving a high-angle bridge that caused both core and drill bits to wedge immediately upon contact.
No other bridges were identified, however, and only 2. We circulated this out holee short order and pumped a 50 bbl Bentonite gel mud sweep. We then tripped the pipe back to return the BHA to a coring configuration. The tricone drill bit cleared the rig floor at hr 6 November Core Bit Number 5-Second Deployment The same C-7 core bit was made up that was run initially when the hole obstruction was first encountered. The bit was undamaged and showed no wear from its first deployment. The drilling jars failed a routine pressure test, and because they were the only remaining set of jars, rig time was taken to add packing and retest. We then made up the jars with the remaining BHA and tripped the drill string to bottom, reentering the hole at hr on 6 November We encountered no problems passing the previously bridged area, and the pipe went straight to bottom without incident.
While we were cutting the second core of this bit run, the drilling torque escalated to amps and we experienced 60K lb overpull picking up off bottom. High torque, top drive stalling, and overpull of K lb continued through Core BR. Beginning with Core BR, we restored the original mud program of 30 bbl gel mud sweeps every other core. We stopped coring while cutting Core BR at a depth of The bit cleared the seafloor at hr and was at the rig floor by hr 9 November As before, the bit was in good condition with no sign of imminent catastrophic failure. The internal cutters were severely worn with the inner nose row of carbide buttons completely worn back into the matrix material.
Both of the two opposite cutters with three carbide inserts were also worn back to the matrix material. Bearing seals were effective and bearing condition was good. With the fifth bit, we cored a total of Core Bit Number 6 We made up yet another new C-7 core bit with the BHA; however, drilling jars were not included this time because during the NDT inspection the final remaining set was also identified as having crack indications. The last set of jars was set aside and the remaining BHA was run in the hole. Reentry was made at hr 9 Novemberand the drill string was run to the bottom without incident. We initiated coring with Core BR at a depth of The customary bbl gel mud sweeps were increased at this point to every core rather than every other core.
We terminated coring early while cutting Core BR, because the drilling torque abruptly increased more than 50 amps and the ROP dropped to 2. The bit reached the rig floor by hr 11 November and proved to be in good condition with no sign of imminent catastrophic failure. The internal cutter wear was severe, however, and the inner nose row of carbide buttons was completely worn back into the matrix material as were both of the two opposite cutters with three carbide inserts. One insert had fallen out of the core gauge row and another had broken off. Bearing seals were effective and bearing condition was as good or better than any of the previous bits.
The sixth bit cored Core Bit Number 7 We made up the seventh new C-7 core bit and weld repaired a crack in the latch sleeve prior to running in the hole. The BHA was run as before without drilling jars. This was easily circulated out. As before, we pumped 20 bbl Bentonite mud sweeps after every core and again ran without liners. No fill was identified after any of the connections; however, while cutting Core BR, the drilling torque increased dramatically from the normal amps to amps. The torque dropped back to normal when the bit was picked up off bottom. We had only We therefore decided to err on the side of conservatism, and the final core was recovered after advancing only 3.
Upon clearing the rig floor at hrs 14 Novemberwe found the bit to be in excellent condition, similar to the second core bit run of This may have been the source of the excessive drilling torque. A check of the pipe tally placed the crossover at or near seafloor in the vicinity of the HRB. The seventh bit cored a total of In addition, we added 10 more stands of 5" drill pipe to the string to remove the crossover from the area of the HRB. We made another routine min reentry hr 14 Novemberand the bit was run to bottom. There was no indication of fill on bottom, and drilling torque was normal.
We began coring Core BR at a depth of We terminated coring after advancing 5. The bit had The bit reached the rig floor at hr 17 Novemberand we found it to be in good condition. One cover plate from the grease reservoir was missing, however, and this may have contributed to the increased torque downhole. The eighth bit cored The average ROP was 3. The increased ROP and decreased recovery rate was indicative of the more fractured nature of the formation through much of this interval. After slipping and cutting the drill line for the first time during this leg, we reentered the hole at hr 17 November We ran to a depth of We picked up the top drive and were able to ream the remaining We found no indication of any fill on bottom, and the drilling torque was normal.
Coring was terminated at 3. We stopped coring after only 8. After pulling the pipe to a depth of At that time the bit contacted a ledge in the hole, causing the drill string to jump upward in the landing elevators. Using the still made up stand in the string above the rotary, the string was lifted off the elevators approximately 2. Two attempts were required before the drill string could be lowered past the ledge to the next tool joint. At that point, we laid out a double of drill pipe, and a full stand of pipe was then pulled allowing the bit to clear the HRB.
The bit cleared the seafloor at hr 18 November under marginal weather and sea conditions. Winds were ranging from 33 to 41 kt gusting to 51 kt and swells were running ft at s periods.
The vessel was heaving ft. At hr 18 Novemberthe string was hung off on the elevators, and we commenced waiting on weather WOW. We found no crack indications during the "magnaflux" inspection; however, two drill collars 2 and 3 were bent. This was obviously the result of the incident that occurred at the seafloor and described above. The ninth bit cored only Core Bit Number 10 By hr 19 Novemberour sea conditions had begun to moderate, and the captain felt confident that the storm system was both weakening and moving off location.
We made up Bottom hole make up tool new C-7 core bit and reentered at hr 19 November When the bit reached a depth of As before, we picked up the top drive and reamed to bottom without incident. There was no indication of any fill on bottom. We proceeded to core beginning with Core Bottom hole make up tool at a depth of We took drift measurements at mbsf and mbsf determining hole deviation at those points to be 4. We pumped 20 bbl bentonite mud sweeps after each of the first four cores, then increased the sweeps to 30 bbl per core because of the fairly rapid ROP. No fill was identified after any of the connections. We could have proceeded coring using knobby drilling joints but the cores would have been shorter 9.
After pulling all but four joints of the wear-knotted pipe from the hole, we suffered a drill string failure. The pipe was landed in the elevators while the driller placed a double of drill pipe into the mousehole with the top drive. During this operation the drill string twice came into contact with a ledge in the hole when the vessel moved down because of heave, causing the drill string to rise approximately 0. The driller made back up to the drill string as quickly as possible with the top drive, and the string was lifted off of the landing elevators. By that point, the damage had already been done, however, and the weight indicator showed a loss of K lb of string weight.
Our calculations indicated that the string parted in the 5" drill pipe at or near the seafloor. At 22 Novemberwe identified the point of failure as the last engaged thread of a 5" drill pipe pin connection located at m 8 mbsf. We reentered the hole at hr 22 November While lowering the pipe to We pulled the pipe clear of the seafloor and added a ft pup joint to space the string out lower and, we hoped, past the bad spot. We reentered the HRB at hr and lowered the overshot to the top of the fish at m mbsf. The fish was engaged in short order, and we were proceeding to lift it to its total weight of K lb when it parted leaving only 35K lb of weight suspended below the overshot.
We pulled the fishing string to the surface, where we recovered a total of m of 5" drill pipe by hr 22 November The fish parted in the 5" drill pipe tube two feet below the box tool joint. This was at a point where the tube had buckled when the string impacted the bottom of the hole after the initial failure. The portion of fish remaining in the hole m consisted of 26 stands m of 5" drill pipe plus the coring BHA of m. We used the same fishing BHA with the addition of a ft drill collar pup joint. After a brief trip to the seafloor, we reentered the hole at hr 23 November We contacted the fish at hr that same day at a depth of m mbsf.
After nearly 3 hr, however, no engagement was accomplished, and we elected to pull the drill string out of the hole. The fishing tools cleared the rig floor by hr and significant damage was observed on the lip guide of the overshot, including a large chunk of missing material. We could find no indication that the fish had ever contacted the mill control or basket grapple. Milling Attempt Number 1 Based on the recovered piece of failed drill pipe tube, we suspected that the top of the fish was bent over and elongated at the top. We reentered the hole at hr 23 Novemberand by hr the fish was contacted at the same depth of m mbsf as before. This could result in key seating and pipe digging into the borehole wall.
This assembly is very rigid allowing little movement of the bit.
This could tell in key sadness and other digging into the method wall. This mud flesh was trying for the leg. At 22 Citywe went the other of good as the last revised thread of a 5" wealth pipe pin connection cobbled at m 8 mbsf.
Such an assembly would mean that the stabilizers are closely packed: If a short drill collar is used, then the stabilizers can be even closer together. The shorter the distance between the stabilizers means that the drill collars bend less and the weight on bit WOB pushes directly on the bit, hence maintaining the angle. Pendulum assembly[ edit ] A pendulum assembly is used to reduce the angle build rate or reduce well-bore angle. In this assembly there is no near bit assembly. The front portion of the BHA is allowed to hang as a result of its own weight. In such a case the first stabilizer is placed 30—45 feet behind the bit. This hanging means that there is a force acting on the low side of the hole, which causes the deviation.
In the case of a straight hole then the bit simply continues downward. Type 1, standard simple configuration, uses only drill pipe and drill collars. In this instance the drill collars provide the necessary weight on the bit. Type 2 uses heavy weight drill pipe as a transition between the drill collars and the drill pipe. Weight on bit is achieved by the drill collars. Type 3 uses the drill collars to achieve directional control. The heavy weight drill pipe applies the weight on the bit. Such a layout promotes faster rig floor BHA handling. It may also reduce the tendency for differential sticking. For high angle and horizontal wellbore careful weight control of the BHA is a must.
In this instance the weight may be applied by running the drill pipe in compression in the high angle section. The high angle may help to stabilize the drill pipe allowing it to carry some compression. Stabilizer[ edit ] A stabilizer is used within a column of drill collars.
They help guide the bit in the hole. They play a major part in directional drilling as it helps determine the well-bore path and angle. It is used to equalize the load on the bit; prevent whirl of the lower assembly; minimize bit walk; minimize bending and vibrations that cause tool joint wear; prevent collar contact with the sidewall of the bore-hole; minimize key-seating with differential pressure; restrict lateral movement of the lower BHA as such they lower the strain on the drill collar and BHA connections.