Diaseal M® Lost Circulation Material Case Histories


Case History #1 - Louisiana

An operator in Perry, Louisiana had drilled out of 7 5/8" casing with an 18.1 ppg mud. After 1,200 ft had been drilled, mud losses of 7 1.2 bbl/hr were noted. For the 70 bbl of open hole volume, a 150 bbl Diaseal M® LCM pill was squeezed to 250 psi holding pressure. The procedure was successful and the well was TD’d at 14,500 ft without further problems. 



Case History #2 - Alberta, Canada

A major Canadian operator was able to eliminate a string of intermediate casing in a well near Slave Lake, Alberta, through implementation of a Diaseal M® LCM squeeze. Due to total losses in the Wabamum formation, they blind-drilled to intermediate casing point. 20 m3 (125 bbl) of unweighted slurry with 43 kg/m3 (15 lb/bbl) of Diaseal M® LCM was mixed and placed into the wellbore above the uppermost loss zone. After waiting 2 hours while hydrostatic pressure squeezed the slurry, the annulus was filled with mud. By keeping the annulus filled over the next hour, the hole finally stood full. The hesitation squeeze procedure was then implemented by closing the annular BOP and pumping into the annulus through the kill line. The desired holding pressure of 1200 kpa (175 psi) was achieved in about 1 hour. The production interval of the well was then cored, logged and cased without further mud losses. This operator has had numerous successes with Diaseal M® LCM squeezes in this area.



Case History #3 - Mississippi

A major operator experienced severe lost circulation in Greene County, Mississippi while drilling at 16,632 ft with an 18.2 ppg oil mud. The limestone formation had been broken down during a gas kick where SIDPP was reported to be 2800 psi. After a number of unsuccessful LCM pills and three unsuccessful cement squeezes, (oil mud losses totaling 2,621 bbl), a Diaseal M® LCM squeeze was attempted. A 100-barrel slurry of Diaseal M® LCM and diesel was mixed in a turbine blender and weighted to 18.2 ppg. The slurry was pumped into place with a cement pump truck, and a 10 bbl diesel spacer was pumped ahead and behind the slurry to prevent any cross-contamination. A total of 56 barrels of Diaseal M® LCM slurry was squeezed into the formation, utilizing the "hesitation squeeze" technique. A holding pressure equivalent to 19.3 ppg was obtained and circulation was regained. Another squeeze was required at greater depth after the residual cement had been cleaned out. Only seven barrels of slurry were required to seal off this thief zone. No further loss problems were encountered in this interval, and mud weight was 19.1 ppg at TD.



Case History #4 - Louisiana

Severe lost circulation was experienced at 16,550 ft with an 18.0 ppg oil-base mud near Lake Arthur, Louisiana. A 100-bbl 18.0 ppg oil-base Diaseal M® LCM squeeze was implemented and a 375 psi holding pressure was obtained. Drilling resumed, but another loss zone was encountered 50 ft deeper. A second squeeze was applied and it, too, was successful. This procedure had to be applied again for one additional loss zone at greater depth, and TD was reached without further problems.


Before using this product, the user is advised and cautioned to make its own determination and assessment of the safety and suitability of the product for the specific use in question and is further advised against relying on the information contained herein as it may relate to any specific use or application. It is the ultimate responsibility of the user to ensure that the product is suited and the information is applicable to the user’s specific application. Chevron Phillips Chemical Company LP does not make, and expressly disclaims, all warranties, including warranties of merchantability or fitness for a particular purpose, regardless of whether oral or written, express or implied, or allegedly arising from any usage of any trade or from any course of dealing in connection with the use of the information contained herein or the product itself. The user expressly assumes all risk and liability, whether based in contract, tort or otherwise, in connection with the use of the information contained herein or the product itself. Further, information contained herein is given without reference to any intellectual property issues, as well as federal, state or local laws which may be encountered in the use thereof. Such questions should be investigated by the user.