| DIRECT TRANSLATION FROM
REPORT ISSUED BY
MI-DRILLING FLUIDS OF VENEZUELA
|City of Ojeda, June 16, 1999
Attn: Alan Guirand
Use of Thuslick on the 12 1/4" hole
Utilizing 10% v/v of VASSA LP-90 Mineral Oil on well VLG-3844
Paramentros de Perforacion
|10.69||40||15||13||4 / 8||4.4||1/32||14||78||50||1.0||10.6||1.9||1.1||3.2||3800||280|
|Vassa Mineral Oil LP-90||29.99|
Drilled 12 1/4" hole from 4500 ft to 7292 ft. Made short trip to casing shoe. Continued drilling from 7292 ft to 11,860, tripped out of the hole due to low ROP. Tripped in hole with Down hole motor (DHM), drilled from 11860 ft to 13450 ft. Made short trip with drag of 80 to 100 Klbs from 13,073 ft at 12,315ft, it was necessary to rotate and pump to pull out of the hole, lay down motor. Continued drilling with top drive to 13,563 ft tripped out because top drives problems. Picked up DHM and run back in hole and drilled from 13563 ft to 14434 ft pulled out because of low ROP. Tripped in hole with BHA and bit, rotating drilled from 14,434 ft to 15,173 ft to TD at 15,173 ft.
Well VLG-3854, utilizing 2.28% to 5.14% of Liquid Lubricant (LUBE 100 + VEN LUBE)
Drilled 12 1/4" hole from 4500' to 5247' with ADL fluid pumping viscous pills every 200'. Pulled out of the hole because of pressure increase. Change jet nozzles 5 x 20 TFA+1.534, lower pipe to 5247 ft. and displaced ADL for Lignosulfonate mud. Continued drilling to 8685 ft. Pulled out of the hole for problems with BHM. Tripped in hole with conventional BHA and bit, continued drilling from 8685 ft. to 10,590 ft. Short tripped with drag of 50 - 70 KLBS. Drilling continue from 10,590 ft. To 11182 ft. Pulled out of the hole because of balling and poor ROP. Tripped in hole with new bit and drilled to 10,234 ft and reamed to 11,182 ft. Drilling continued with BHM to 13,529 ft. Tripped out of the hole because problems with the BHM.
Prior to pulling out of the hole Thuslick was added in concentrations of 5 ppb. Pulled out pipe without any problems, Tripped in hole with BHA and bit with no problems and from 13,529 ft to 14,730 ft to end of the interval.
We used 2.28% v/v of Liquid Lubricants (LUBE 100 + VEN LUBE)
in combination with 5 ppb of Thuslick on well VLG-3857
Drilled 12 1/4" hole from 4500 ft to 6000 ft with ADL fluid, pumping viscous pills every 200', we displaced ADL for Lignosulfonate mud at 6000 ft and drilled from 6000 ft to 14,485 ft. Short trips were made from 7154 ft to 4480 ft with drag of 30 to 40 Klbs and, from 9981 ft to 6969 ft we did not encounter any problems. From 11,980 ft to 10,105 ft with drags of 40 to 60 Klbs, from 13,975 ft to 11,396 ft Pipe was pulled free with pump and rotation from 13,066 to 11,424 ft. The concentration of Thuslick was increased from 4 to 5 ppb to solve the drag problem. The 12 1/4" hole was DT at 14,720 ft. Caliper log was run to 11,950 ft. without any problems. 9-5/8 casing was run without problems.
Analyzing the experiences obtained during the drilling of the 12 1/4" hole in the Ceuta field Block VII, utilizing the lubricant above mentioned.
The following conclusions are made:
|Well Alturitas - 41||TOP|
was added to a well in Venezuela at 10,360. The hole angle was 23 degrees. The
operator was using Lubra beads for lubrication, and Soltex for shale stabilization. The
operator was trying to slide, and R.O.P. was between 7 and 12 ft per hour. Torque was high
with the motor sometimes stalling out. There were numerous tight spots below 9700,
and heavy shale caving was evident on circulating bottoms up.
Thuslick was added at 10,360 and additions of glass beads and Soltex ceased. After 24 hours a trip was made from 10,413 with no excessive overpull. There was no fill on returning to bottom.
During the next few days the drilling rate was maintained at 9 to 20 ft per hour. The bits being pulled were out of gage, causing the hole to be reamed. Eight days after the addition of the Thuslick a primary H.T.H.P. fluid loss material was added to help stabilize the H.T.H.P. Fluid loss. Hole angle was built to 59.9 degrees in a stressed coal section with no problems, and the well was drilled to total depth of 12,135.
At T.D. There was over 10,000 of open hole, and considering the amount of open hole, the angle, the stressed coal section, and the length of time the hole was open the operator felt that Thuslick had saved them a string of casing.
At the TD of this well, there was over 10,000 feet of open
hole. Considering the amount of open hole, the angle, the stressed coal section, the
dogleg at the bottom and the amount of time that some of the hole had been open, it
seem that Thuslick must have done a formidable job in order for the well to reach
the proposed TD without any major problems. Also there was the saving of one string of