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Brazoria County
Newton County
Texas #1
Newton County
Texas #2
Grady County
Marathon Oil


  Brazoria County, Texas TOP  

       Operator drilled to 8980’, set 7 5/8" casing at 8738’, and left 242’ of 9 7/8" rat hole. Well was drilled to 10,676’, but could not circulate, after a bit trip the operator was forced to pull back up into the casing to break circulation. Attempted to run back to bottom, washed and reamed to 8984’ where hole packed off. Added 5# pbl of soltex and raised the funnel viscosity to 50 sec/qt.

       Washed and reamed repeatedly to work through a trouble section at 8950’, but the hole kept packing off. Changed stabilizers and ran in the hole to 8890’. Circulated out and began trying to drill back to T.D. drilled at 12 ft. per hour with 12,000 pounds on the bit.

       Thuslick™ was added at a concentration of 8 ppb.   Penetration rates went up to 35 feet per hour with 14 thousand pounds on the bit.  At 10889’ drag was pick up 5 thousand pounds, and slack off 4 thousand pounds. At 10889’ a survey showed 7.5 degrees and drilling progressed at 10 to 14 ft per hour with 8 thousand pounds on the bit. Torque was 180 to 200 amps through this time.

       Well was drilled to 13,400’ with no problems pulled out of hole and changed bits. Ran back to bottom with no problem, but well kicked, and raised mud weight to 16.5 PPG from 15.2 PPG. Torque went up to 300-3330 amps.  Added 25 ppb Thuslick™ to the mud and reduced the torque back to 180-200 amps. Well was logged. Logging took two days without problems.

The operator’s evaluation of Thuslick™’s performance was:

  • Reduced H.T. H.P. fluid loss from 24 cc’s to 16-18 cc’s.    
  • Eliminated bit balling
  • Increased penetration rated
  • Elimination of heaving shale
  • Elimination of drag
  • Gage hole
  • Logged for two days with no problems
  • Improved drilling curve 1 1/2 days


  Newton County, Texas #1 TOP  

       A horizontal well was kicked off at 12,655 ft, and drilled to a depth of 17,670’. The well had two camel backs at about midway through the horizontal section. The operator was having great difficulty in sliding and very high torque when trying to rotate at 15,499’.

       The operator decided at this point to use Thuslick™. The initial treatment was 5 ppb.   This eliminated the torque problem. The operator then decided to use Thuslick™ in pill form for sliding. They were unable to slide at a rate greater than 1-ft. per hour. The use of pills composed of 70 bbls of 13.2 PPG drilling mud treated with 3 bbls of diesel oil and 15 sacks (825 pounds) of Thuslick™ increased their sliding rate to 8 to 10 feet per hour.

The well was drilled on to T.D. at 17,620’ and
the operator was very happy with
the ability of Thuslick™ to solve these severe problems.


  Newton County, Texas #2 TOP  

       Operator was drilling a horizontal well, and experiencing very high rotary torque, and having great difficulty sliding Thuslick™ was added to the water based mud system, and rotary torque decreased to acceptable levels. Sliding rates continued to be slow (about one foot per hour), so a 70 barrel pill was mixed using 11.7 pounds per barrel of Thuslick™and 3 barrel of diesel.

The slide rate increased to 10 ft per hour and
the well was drilled to a T.D. of 17,629 feet with no further problems.


  Grady County, Oklahoma TOP  

       Operator was drilling a directional well below 16,000’. The drilling rate was one foot per hour and the operator found steel in the cuttings indicating severe casing wear. Thuslick™ was added to the water based mud system with the following results; the casing wear was eliminated, and the drilling rate increased to 3 to 4 ft. per hour.

The operator was very happy with the lack of damage to the casing,
and the considerable savings in time.


  Offshore Louisiana TOP  

       Operator was drilling offshore Louisiana with shallow surface casing set. The well was deviated to 30 degrees when serious problems were encountered with torque, drag and shale sloughing. Penetration rates were 30 ft. per hour. The pipe was stuck, and a spotting fluid was used to free the pipe.

       After freeing the pipe 4 lbs. Per barrel of Thuslick™ was added to the water based mud. The problems with torque, drag, and shale stabilization were solved. The penetration rate increased to 100 ft. per hour, and the well was drilled to T.D. without further problems.

The operator was extremely pleased,
and has included Thuslick™ in their next well program.


  Marathon Oil Report TOP  

Well: Mitchell # 2-34
Field: Carter Knox
Date: February 23, 1998
Location: Grady County, Oklahoma
Rig: Bayard # 46
Marathon Rep. On site: Sam Nabors
This well was drilled with

oil base mud to the top of the Anadarko,

a thick and very hard limestone formation.

       At this point 7" casing was set and the oil base mud was changed for water base mud. The well was drilled out with 5-7/8" bit. When the customer decided to use Thuslick™ they were experiencing high torque, drag, low penetration and metal cutting in the mud. They also were making coring runs and had gone to a diamond bid.

Pick up weight 325K
Slackoff weight: 190K
Rotating weight 242k
Torque: 125 psi to 150 psi
Rate of Penetration 1 ft/hr
Weight on bit 7K to 8K
(Metal Cutting in mud)
Mud Weight: 10.5
Mud Volume: 1800 bbl
Bottoms up: 2 Hrs
Complete Circulation: 7 Hrs
Pickup Weight: 300K
Slackoff Weight: 220K
Rotating weight: 242K
Torque: 75 psi
Rate of Penetration 2 to 4 ft/hr
Weight on bit: 12K – 13K
Metal cutting in mud: Nil-Trace

       Thuslick™ was mixed in 7 Hrs using 164 Sacks and before the mixing was finished, the numbers from the base reading started down.

       To date 3/17/98 the well is still being drilled with the same readings as when Thuslick™ was added to the mud.

The main interest of the customer was the metal loss in the mud, which has been eliminated. Torque and drag was reduced to reasonable levels and the rate of penetration has more than doubled.

       The well should take another 30 to 45 days to complete, at that time Thuslick™’s performance shall be reviewed again.