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Baker Core Jamming system – Justification

At Koms due to highly interbeded formations Core recovery is a challenge. Second the core lengthsat more than 50m. Conventional core can cut only 27m in one go. In order to cut more than 50m

core, !o core runs are re"uired !hich re"uire additional rig time, atleast one day of additional rig

time. Average daily s#read cost is more than $S% &0,000'day. %ifferent service #roviders !ere

called to #resent most economical and technically viable o#tion for this #roblem. (a)er came u#!ith the *ambuster solution !hich is field #roven here in Ka+)a)hstan !ith "ualified local service

ngineers.

Background:

Core -amming is a common reason for terminating coring o#erations and #ulling out of hole.

*amming can be caused by several factors/ ormation factors

•  Core bit configuration ' design ' dynamics factors

•  (1A (ottom 1ole Assembly3 dynamic factors

•  Inner core barrel technology ' core catcher factors

•  1ole conditions•  4echanical and o#erator #arameters

• $nconsolidated core material colla#sing under its o!n !eight causing high friction against

the inner barrel.

•  #anding clays causing high friction and adhesion against the inner barrel.

Solution?

/ Stabili+e the outer and inner barrels

/ $se 1igh or"ue 13 core barrels/ Careful control of coring #arameters 6(, 894, etc.3

/ $se of Anti!hirl core bits/ 8educe the )erf area cutting surface3 on the core bits/ $se telesco#ing inner core barrel *am (uster3

/ $se Core :els to increase the lubricity bet!een the core and inner barrel

/ 8un barrels !ith Core *am Indicator / ull Closure Core Catcher 1ydrolift3

/ Core%rill coring;!hile;drilling !ireline system

/ elesco#ing inner core barrels

/ tended lo! invasion3 #ilot shoes/ 4otor coring

/ Anti!hirl 9%C core bits

Telescoping Inner Core Barrels solution for Koms wellshe 9atent (a)er 1ughes <*am (uster= anti;-amming system utili+es telesco#ing inner core barrels

to allo! continued coring after -amming occurs. his system has been successfully used at Kom I;>recovering ?00@ core and cutting &0m of core in one run thus saving additional tri#s and resulted in

cost saving of USD75,. here are not other service #rovider currently in the country !ho can

 #rovide this cost effective solution.

4ain eatures ; &'>= ?'2= Core (arrel

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•  !o telesco#ing core barrels and one fied inner core barrel ; allo!s coring o#erations to

continue after t!o -ams have occurred.

•  he shear #ins !hich loc) the barrels together can be set at different strengths de#ending

u#on formation strength.

•  A core -am indicator alerts the o#erator !hen further #enetration is not #ossible ; -ammed

off or full barrel. Coring can be sto##ed and the tool #ulled out of hole.

•  Can be used in con-unction !ith anti;!hirl core bits, lo! invasion coring systems, and :elCoring.

• (enefits

•  Coring can continue until three -ams have occurred.

•  ield data indicates that im#roved coring efficiencies of 0;50@ are achievableB ie. At Koms

I;> the average core 89 !as Dm'hr against #revious system offer !as 5;& m'hr.

In the vie! of above and #ast e#erience !ith several service #rovider (a)er has been chosen forKoms area in 200D and to standardi+e the services and successful a##lication it is recommended to

use the same tools and services for Kom I;?'2E.

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!esults of "revious #endor $ender selection