BHA components and performances

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BOTTOM HOLE ASSEMBLYCOMPONENTS

AND PERFORMANCES

MPRL E&P Pte Ltd;BOTTOM HOLE ASSEMBLY

COMPONENTS AND

PERFORMANCES

PRESENTED BY;

MYO MIN HTETASSISTANCE ENGINEER

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THE DEFINITION OF DRILL STEM AND DRILL STRING.

DRILL STEM

-ALL MEMBERS IN THE ASSEMBLY USED IN ROTARY DRILLING FROM THE SWIVEL TO THE BIT ,INCLUDING KELLY IS CALLED DRILL STEM.

DRILL STRING

-DRILL PIPES,DRILL COLLARS AND BIT.

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WHY WE USE BHA?

THE BOTTOM HOLE ASSEMBLY (BHA) PROVIDE THE FOLLOWING FUNCTIONS:

- Provide weight for the bit (WOB). - Provide strength needed to run in compression. - Minimize bit stability problems from vibration, wobbling and jumping. - Minimize directional control problems by providing stiffness to the bottom hole assembly(BHA).

Today, the bottom-hole assembly serves several useful purposes, In addition to the simple need to effectively load the bit with drill collar weight.

Correctly designed, they can: -Prevent doglegs and key seats.-Produce a smooth bore and full size hole.-Improve bit performance.-Minimize drilling problems.-Minimize harmful vibrations.-Minimize differential pressure sticking.-Reduce production problems.

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NOT ENOUGH DRILL COLLAR WEIGHT

DRILL PIE BUCKLING

ADEQUATE DRILL COLLAR WEIGHT KEEPS DRILL PIPE STRAIGHT

IN FIGURE A; THE DRILL STRING IS STABLE DUE TO ENOUGH DRILL COLLAR LENGTH.

IN FIGURE B; THE DRILL STRING FACED BUCKLING EFFECT DUE TO UNSUFFICIENT DRILL COLLAR LENGTH.

A B

THE FOLLOWING FIGURE SHOW AN ADVANTAGE OF DRILL COLLARS USING IN DRILL STRING.

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A. BOTTOM HOLE ASSEMBLY COMPONENTS

THE BOTTOM HOLE ASSEMBLY IS THE PORTION OF DRILL STRING BELOW THE DRILL PIPES ;INCLUDING SOME BUT NOT NECESSARILY ALL OF THE FOLLOWINGS:

I -BIT II -DRILLING MUD MOTORS III -STABILIZERS(STAB) IV -DRILL COLLARS(DC) V -REAMERS OR HOLE OPENER VI -DRILLING JARS VII -HEAVY WEIGHT DRILL PIPES (HWDP) VIII-ASSORTED SUBS(CROSS OVER SUBS) IX -DRILL PIPES

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BIT

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I.BIT

THERE ARE MANY TYPES OF OIL WELL DRILLING BIT.

1.ROLLING CUTTER BIT OR TRI-CONE BIT 1.A.ROCK BIT(STEEL TOOTH, MILL TOOTH BIT) 1.B.TCI BIT(TUNGESTEN CARBIDE INSERT BIT)2.FIXED CUTTER BIT 2.A. PDC BIT (POLY CRYSTALLINE DIAMOND COMPACT) BICENTER BIT ALSO INCLUDED IN PDC TYPE. 2.B. DIAMOND BIT3.MIXED CUTTER BIT 3.A. HYBRID DRILL BIT(THE MODERNIZED PRODUCT)

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ROLLING CUTTER BIT OR TRI-CONE BIT

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1.ROLLING CUTTER BIT OR TRI-CONE BIT

THIS WIDELY USED BIT TYPE IN OIL WELL DRILLING INDUSTRY UNTIL PRESENT DAYS.

ROLLER CONE BITS ARE DESIGN FOR DRILLING VERY SOFT FORMATIONS TO VERY HARD FORMATIONS.

THERE ARE MANY TYPES OF ROLLER CONE FEATURES WHICH ARE DESIGN FOR UPON ON FORMATION.

THREE CONES ROTATING ACTION CUT THE FORMATIONS,THAT ARE MOUNTED ON EXTREMELY RUGGED BEARINGS.

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1.A .ROCK BIT/MILLED TOOTH BIT/STEEL TOOTH BIT/TRI-CONE BIT(TC BIT)

CONE 1

CONE 2

CONE 3

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1.B TCI (TUNGSTEN CARBIDE INSERT BIT)

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1.B TCI (TUNGSTEN CARBIDE INSERT BIT)

CONE 1

CONE 2

CONE 3

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1 B.TCI BIT

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BIT CLASSIFICATION FOR THREE FORMATION TYPES BY JOURNAL ANGLE

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TYPICAL USED INSERT TYPES FOR TCI BIT.

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PDC BITFIXED CUTTER BIT(PDC(POLYCRYSTALLINE DIAMOND COMPACT BIT)

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2.A FIXED CUTTER BIT(PDC(POLYCRYSTALLINE DIAMOND COMPACT BIT))

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CUTTER

PROFILEBLADE

GAUGE

2.A FIXED CUTTER BIT(PDC(POLYCRYSTALLINE DIAMOND COMPACT BIT))

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PDC BIT

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EXAMPLE OF PDC BIT

MS-612 MS-713

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BICENTER BIT(BICENTRIX)

A BIT WHICH IS USED IN DEEPENING OPERATION HAVE FRONT PILOT SECTION AND REARER REAMER SECTIONTHE SIZE IS EXPRESSED AS XX” x XX” WHILE RUNNING INTO THE HOLE,THE RUNNING DIAMETER IS FRONTABBREVIATION THE ROTATING DIAMETER IS THE REAR ABBREVIATION.

FOR EXAMPLE,THE BIT IS EXPRESSED AS 4 ½” X 5 ¾” DIAMETER; WHILE WE RUNNING INTO THE HOLE THE SIZE IS 4 ½” DIAMETER.WHEN WE RECIPROCATING THE BIT,THE HOLE SIZE WOULD BE 5 ¾” .

PILOT SECTION

REAMER SECTION

RUNNING INHOLE DRILIING OUT

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THE BICENTRIX BIT IS CURRENTLY USED FOR DEEPENING OPERATION INMANN OIL FIELD.

CURRENTLY USED SIZE;-# 183- 4 ½” X 5 ¾” BICENTRIX-# 282- 4 ½” X 5 3/8” BICENTRIX

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IN FIGURE,THE BI-CENTRE BIT SIZE IS 12 ¼” X 14 ¾” ,CAN RUN INSIDE 13 3/8” CSGAND CAN OPEN THE HOLE SIZE TO14 ¾” DIAMETER.

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2.B DIAMOND BIT(THERMALLY-STABLE POLYCRYSTALLINE (TSP)

USAGE HAS TREMENDOUSLY INCREASED FROM 1957 AND BECOME ECONOMICAL DRILLING TOOL.

HARDNESS MATERIAL,ABRASIVE RESISTANCE

DIAMOND ARE HARDER THAN 40 TO 50 TIMES THAN HARDEST STEEL

4 TO 5 TIMES HARDER THAN TUNGSTEN CARBIDE INSERT

MADE WITH 1/15 CARRACT LIGHT CAN’T PASS GRAY OR GREENISH DIAMOND STONE FROM THE REPUBLIC OF CONGO.

THREE MAIN PARTS ARE DIAMOND,MATRIX AND SHANK.

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THE MODERNIZED BIT FOR DRILLING INDUSTRY.

3.A HYBRID DRILL BITSTHE COMBINATION OF FIXED CUTTERS AND ROLLING CUTTERS.SPECIALLY DESIGNED FOR VERY HARD FORMATION.FORMATION EXAMPLE,IN BRAZIL OIL FIELD,YEMEN &SAUDI ARABIA OIL FIELDS.VERY HARD AND ABRASIVE SANDSTONE INTERBEDDED WITH SHALE AND SILT STONE CAN CAUSE VIBRATION WHILE DRILLING.EVEN THE PDC BIT AND TCI BIT SUFFER LOW ROP.THE SOLUTION IS HYBRID DRILL BITS.CAN REDUCE 50% OF THE DRILLING COST PER FOOT

THE ADVANTAGES ARE ;-CAN REDUCE TRIPPING TIME FOR CHANGING BIT.-THE DOUBLE RATE OF PENETRATION THAN PDC AND TCI BIT. IN BRAZIL’S POTIGUR BASIN FORMATION.(WITH SAME DRILLING PARAMETERS)PDC BIT-ROP 14.4 FT/HR.TCI BIT-ROP 13 FT/HR.HYBRID DRILL BIT -24.6 FT/HR.

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CURRENTLY USED IN DEEP WELL DRILLING INDUSTRY.

VERY SUITABLE FOR HIGHLY INTERBEDDED FORMATIONS,CHART INTERVALS,CARBONATE AND DIRECTIONAL DRILLING.

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Guide lines for Drilling Out Wiper Plugs, Cement, Shoe and Float assemblies with bit

Different types of drill bits and BHA have different drill out procedures. But in the inside casing,The drilling parameters is different with normal formation.When designing a drill out float assembly for PDC applications,“PDC friendly” equipment will ensure a successful run(ie: more plastic and rubber componentsmake for an easier drill out).Liner running tools and float equipment that require an activating ball to set or close the linerHanger or float can cause problems during drill out these balls (typically made of brass)can damaged by resulting in slower penetration rates and failure to complete the desired interval.Alumininum landing collars can also be problematic.Alumininum in the dart, landing collar, float collar and float shoe can plug the junk slots of the Impairing bit cleaning/cooling and hence bit performance.

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Guide lines for Drilling Out Wiper Plugs, Cement, Shoe and Float assemblies withRoller Cone drill Bits(Insert Milled Tooth)

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Guide lines for Drilling Out Wiper Plugs, Cement, Shoe and Float assemblies withPDC,BICENTRIX AND DIAMOND BITS

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DRILLING MUD MOTOR

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II.DRILLING MUD MOTOR

A DRILLING TOOL MADE UP IN THE DRILL STRING DIRECTLY ABOVE THE BIT.IT CAUSES THE BIT TO TURN WHILE THE DRILL STRING REMAINS FIXED.IT IS USED MOST OFTEN AS A DEFLECTION TOOL IN DIRECTIONAL DRILLING,WHERE IT IS MADE UP BETWEEN THE BIT AND A BENT SUB(OR,SOMETIMES,THE HOUSING OF THE MOTOR ITSELF IS BENT).

TWO PRINCIPAL TYPES OF DOWN-HOLE

POSITIVE DISPLACEMENT MOTORDOWN HOLE TURBINE MOTOR (OR) MUD MOTOR.

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II.DRILLING MUD MOTOR

LOBE PATTERNS (ROTOR LOBES : STATOR CHAMBERS)

9:107:8

3:4 5:61:2

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GENERAL MUD MOTOR COMPONENTS

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GENERAL MUD MOTOR COMPONENTS

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GENERAL MUD MOTOR SPECIFICATIONS

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STABILIZER

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III.STABILIZER

WHAT IS THE STABILIZER &WHY WE USE STABILIZER?

-A SHORT SUB WITH BLADES ATTACHED WHICH IS OF OUTSIDE DIAMETER EQUAL TO,OR SLIGHTLY SMALLER THAN THE DIAMETER OF THE HOLE BEING DRILLED.THE BLADE ARRANGEMENT ALLOWS FLUID RETURNS WHILE SUPPORTING THE DRILL STRING AGAINST THE WALLS OF HOLE.

-STABILIZER ARE USED AS A MEANS OF CONTRLLING THE LOCATION OF THE CONTACT POINT BETWEEN THE HOLE AND DRILL COLLARS.

-FOR A GIVEN HOLE DEVIATION,THE USE OF A SINGLE,PROPERLY LOCATED STABILIZER WILL ALLOW A HIGHER WEIGHT ON BIT.

THE FINS MAY BE ALLUMINIUM,RUBBER OR STEEL WITH TUNGSTEN CARBIDE INSERTS ON THE EDGE.

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THREE BASIC TYPES OF STABILIZERS.

VARIABLE BLADESTABILIZER.

NON-ROTATINGSTABILIZER.

INTEGRAL BLADE STABILIZER OR SPIRAL STABILIZER.

STRAIGHT STABILIZER OR FIXED BLADE STABILIZER.

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IV.DRILL COLLARS

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IV.DRILL COLLARS

DRILL COLLARS ARE THICK-WALLED HEAVY STEEL PIPE,WHICH REDUCES THE TENDENCY OF BREAKING.DUE TO SMALL CLEARANCE BETWEEN THE DRILLED HOLE AND COLLARS IT IS POSSIBLE TO MAINTAIN A STRAIGHT HOLE.

TO FURNISHED THE COMPRESSIVE LOAD ON THE BIT,ALLOWING THE LIGHTER DRILL PIPE TO REMAIN IN TENSION.USING THESE,DRILLERS HAVE BEEN ABLE TO INCREASE PENERATION RATES AND DRILL STRAIGHTER HOLES WITH FEWER DRILLING STRINGS FAILURES.

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THREE TYPES OF DRILL COLLARS

SQUARE DRILL COLLARS SPIRAL DRILL COLLAR S PLAIN DRILL COLLAR

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V.REAMERS OR HOLE OPENER

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THIS TOOLS THAT ARE RUN IMMEDIATELY ABOVE A BIT TO MAINTAINOR ENLARGE THE HOLE SIZE.THE CUTTING ACTION IS BY ROTATINGCONES BUILT FROM THE CENTRAL STEM.BOTH TYPES PERFORM SIMILAR FUNCTIONS,BUT THE CONES OF AN UNDER-REAMER ARE BUILT INTO COLLAPSIBLE ARMS WHICH AREHELD OUT WHILE DRILLING BY THE PRESSURE OF THE DRILLINGFLUID BEING CIRCULATED DOWN THROUGH THE CENTER OF THE TOOL.IN THIS WAY,IT MAY BE RUN IN OR PULLED OUT THROUGH A SMALLRSECTION PF BOREHOLE. THE COLLARS ARE SO MUCH SMALLER THAN THE HOLE,THEY BEND AND WHIP ,LOADING FIRST ONE CUTTER,AND THEN THE NEXT.THEY PUT A TERRIFIC SIDE LOAD ON THE PILOT BIT,AND THEN HOLE OPENER BODY.THE VIBRATION DAMPNER,WITH THE STABILIZER CAN HELP ELIMINATE THIS.

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REAMERS OR HOLE OPENER

PDC UNDER REAMER CONE UNDER REAMER FIXED OPENER

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PDC UNDER REAMERS

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REAMERS OR HOLE OPENER

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VI.DRILLING JARS

DRILLING JAR IS USED WHEN THE DRILLSTRING IS STUCK OR WHEN A FISH IS CAUGHT IN AN OVERSHOT AND CANNOT BE PULLED FROM THE BOREHOLE.

IN NORMAL DRILLING,THE JAR IS PLACED IN THE HEAVY WEIGHT PIPE SECTION,WHILE IN FISHING IT IS LOCATED DIRECTLY ABOVE THE FISHING TOOL.JARING PROVIDES A METHOD OF GIVING AN UPWARD JERK TO FREE PIPE.IT WORKS SIMILAR TO A TRIP-HAMMER.

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VI.DRILLING JARS

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VII.HEAVY WEIGHT DRILL PIPE

AN INTERMEDIATE WEIGHT DRILL STRING MEMBER ATTACHED TO SPECIAL EXTRA LENGTH TOOLS JOINT.DRILL PIPE DIMENSION FOR HANDLING.CAN BE RAN WITH COMPRESSION AS DRILL COLLAR.PROVIDE STABILITY AND MUCH LESS WALL CONTACT.

HEAVYIWEIGHT DRILL PIPE SHOULD NOT BE USED FOR BIT WEIGHT IN VERTICALS HOLES LARGER THAN THOSE LISTED BELOW:5” HWDP-MAX VERTICAL HOLE 10 1/16 INCHES.4 ½ ” HWDP-MAX VERTICAL HOLE 9 1/16 INCHES.4” HWDP-MAX VERTICAL HOLE 8 1/8 INCHES.3 ½” HWDP-MAX VERTICAL HOLE 7 INCHES.

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VII.HEAVY WEIGHT DRILL PIPE

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VIII.ASSORTED SUBS( CROSS OVER SUBS)

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VIII.ASSORTED SUBS( CROSS OVER SUBS)

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TYPICAL THREAD TYPES FOR DRILL STRING.

1.API REGULAR(REG)2.API FULL HOLE(FH)3.API INTERNAL FLUSH(IF)4.AMERICAN OPEN HOLE(AOH)5.HYDRIL JOINTS6.HUGHES H-90(H-90)7.HUGHES SLIM HOLE(SH)8.HUGES SLIMLIN F H-90(SFH-90)9.HUGHES EXTRA HOLE(XH)10.HUGHES EXTRA FLUSH(EF)11.HUMBLE “X” TYPE JOINT12.REED EXTRNAL FLUSH(EF)13.REED DOUBLE STREAM LINE14.REED WIDE OPEN TOOL JOINTS(W.O)15.REED FULL HOLE(FH)16.REED EXTRA HOLE(XH)

HUGES COMPANY

REED HYCALOGCOMPANY

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IX. DRILL PIPE

DRILL PIPE ARE THE ESSENTIAL PART OF DRILL STRING .

THE API(AMERICAN PETROLEUM INSTITUE) STANDARD FOR DRILL PIPE .OUTSIDE DIAMETER (O.D) OF API DRILL PIPE IS THE SAME FOR EACH SIZE.INSIDE DIAMETER IS VARIES WITH THE NOMINAL WEIGHT PER FOOT LENGTH.UPSET ON THE ENDS FOR ADDED STRENGTH.THE TOOL JOINTS ARE SHRUNK OR WELDED ON THE ENABLE LENGTHS OF DRILL PIPETO BE SCREWED TOGETHER TO MAKE UP THE DRILL STRING.

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THE THREE TYPES OF API UPSET DIMENSIONS ARE IN FIGURE.

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DRILL PIPE GRADES

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ZZ 3 02 N S 2

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DRILL PIPE WEIGHT CODE

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BHA PERFORMANCES

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How Do We Control Hole Angle?

Now that we have some ideas as to the possible cause of bit deviation and problems. Associated with crooked holes, Let's look at two possible solutions using The pendulum and the packed hole concepts.

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α α α

T TT POINT OF TANGENCY

Fb Fb Fb

F1

F1

FP FP FP

F2

F2 φ

φ

φ

A B C

SKECTH OF FORCES AFFECTING HOLE DEVIATION ANGLE

FORCE AFEECTING ON HOLE ANGLE

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PENDULUM THEORY &EFFECT

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PANDULUM THEORY

IN THE EARLY 1950s,WOODS AND LUBINSKI RATE IN MATHEMATICAL EXAMINATION OF THE FORCES ON A ROCK BIT WHEN DRILLING IN ANTINCLINED HOLE.

THEIR CALCULATION WAS BASED ON THREE ASSUMPTIONS,

1.THE BIT IS LIKE A BALL AND SOCKET JOINT FREE TO TURN BUT LATERALLY RESTRAINED.

2.THE DRILL COLLARS LIE ON THE LOW SIDE OF THE HOLE AND WILL REMAIN STABLE ON THE LOW SIDE OF THE HOLE.

3.THE BIT WILL DRILL IN THE DIRECTION IN WHICH IT IS PUSHED, NOT NECESSARILY IN THE DIRECTION IN WHICH IT IS AIMED.

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-THEY STARTED IN THE 1950S THAT SIZE OF THE BOTTOM DRILL COLLARS WOULD BE LIMITING FACTOR FOR LATERAL MOVEMENT OF THE BIT.

MINIMUM EFFIECTIVE HOLE DIAMETER(MEHD)

BIT SIZE + DRILL COLLAR OD MEHD = 2

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REQUIRED DC WEIGHT TO OBTAIN A DESIRED WOB FOR A DEVIATED WELL.

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BUOYANCY FACTOR=(65.5-12)/65.5=0.817

SF @ 25%= 0.25

W DC = (50,000 X 1.25) /(0.817 X COS (30))

W DC = 88,333 KLBS.

In this case,drill collar weight in the air should be 88.3 Klb.In reality,the BHA does not only Have the drill collar so need to adapt this figure.For instant,the BHA consists of mud motor,Stabilizer,LWD and HWDP which have a total weight of 30 Klb.Therefore,the actual drill collarWeight is just only 58.3 Klb(88.3-30).

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SUDDENLY REDUCED BIT WEIGHT CAN CAUSE DOGLEG AND OTHER PROBLEMS.

REDUCEDBIT WEIGHT

NORMAL BIT WEIGHT

DOGLEG AUSED BY SUDDEN DECREASEDIN WEIGHT ON BIT.

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PACKED HOLE THEORY

MOST OF THE DRILLING OPERATION IN TODAY USED A PACKED HOLE ASSEMBLY TO OVERCOMECROOKED HOLE PROBLEMS AND THE PENDULUM IS USED ONLY AS A CORRECTIVE MEASURETO REDUCE ANGLE WHEN THE MAXIMUM PERMISSIBLE DEVIATION HAS BEEN REACHED.

THE PACKED HOLEASSEMBLY IS SOMETIMES REFERRED TO AS THE “ GUN BARREL” APPROACH BECAUSE A SERIES OF STABILIZERS IS USED IN THE HOLE ALREADY DRILLED TO GUIDE THE BIT STRAIGHT AHEAD.THE OBJECTIVE IS TO SELECT A BOTTOM HOLE ASSEMBLY TO THE RUN ABOVE THE BIT WITH THE NECESSARY SUFFNESS AND WALL CONTACT TOOLS TO FORCE THE BIT TO DRILL IN THE GENERAL DIRECTION OF THE HOLE ALREADY FDRILLED.IF THE PROPER SECTION IS MADE,ONLY GRADUAL CHANGES IN HOLE ANGLE.

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COMPARISON

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BOTTOM HOLE ASSEMBLY EVALUATION THE BOTTOM HOLE ASSEMBLY IS DIRECTLY EFFECTS ON DRILLING PERFORMANCE THE ADDITION OF A DOWNHOLE DRIVE MECHANISM(MOTOR OR TUBINE)CAN SIGNIFICANTLY INCREASE PENERATION RATE WHILE THE ADDITION OF STABILIZERSCAN EFFECT THE DROPPING,BUILDING OR TURNING TENDENCIES OF THE DRILL STRING.. A ROTARY STEERABLE SYSTEM CAN PROVIDE IMPROVED DIRECTIONAL CONTROLCOMPARED TO THAT OF A MOTOR IN SOME APPLICATIONS,EG: IN EXTENDED REACHED WELLS,’APPLICATIONS WHERE DIFFERENTIAL STICKING OF THE BHA IS PROBLEMATIC,ETC.USEFUL INFORMATION IS- TURBINE RPM MOTOR SPECIFICATION PERFORMANCE CHARTS LOBE CONFIGURATION FOR MOTOR TYPE,EG; HIGH TORQUE,LOW SPEED. REVOLUTION PER UNIT VOLUME MUD PUMPED FOR RPM CALCULATION STABILIZER DETAILS CAN AFFECT BOTH DIRCTIONAL TENDENCIES AND TRANSMITTING WOB,EG: SIZE OF STABILIZER POSITION IN THE DRILL STRING.MWD/LWD DETAILS.EG: DOWNHOLE VIBRATION DATA USEFUL DOWN HOLE DATA ARE; RPM TORQUE(AVERAGE,MAXIMUM AND MINIMUM) WOB PRESSURE VIBRATION.

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STRAIGHT HOLE DRILLING

FOR THE STRAIGHT HOLE DRILLING, VERY IMPORTANT TO GET NEARLY VERTICAL ANGLE WHATEVER THE PENETRATION RATE IS.

PACKED HOLE ASSEMBLY. MAY BE DEFINED AS A STRING OF DRILL COLLARS WHICH ARE ALMOST THE SAME SIZE ATTHE BIT THAT IS DRILLING THE HOLE.OBVISOUSLY SUCH DRILL COLLARS WOULD BEND VERY LITTLE,CONSEQUENTLY,TEND TO DEVIATE VERY LITTLE.

BIT

REAMER

SQUARE DRILL COLLAR

REAMER

REAMER

LARGE OD ROUND DRILL COLLAR

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A TYPICAL STABILIZED SETUP FOR STRAIGHT HOLE DRILLING.

BIT

APPROX:60 FEET LENGTH OF DRILL COLLAR

STABILIZER

DRILL COLLAR

A RIGID STABILIZED SETUP FOR STRAIGHT HOLE DRILLING.

BIT

NEAR BIT STABILIZER

APPROX:12 FEET SHORT DC

STABILIZER

APPROX:30 FEET,1 JT OF DC

STABILIZER

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REMARKS;

DRILL COLLAR PROVIDES WEIGHTS TO THE BIT FOR DRILLING AND KEEP THE DRILLING STRING FROM BUCKLING.ADDITIONALY,DRILL PIPE SHOULD NOT RUN IN COMPRESSION BECAUSE IT CAN GET SERIOUSLY DAMAGED .THEREFORE WE NEED TO KNOW WEIGHT OF THE DRILL COLLAR THAT IS ENOUGH TO PROVIDE WEIGHT ON BIT.

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EXAMPLE OF STRAIGHT WELLS AND PATTERN OF BHA.

CHAUK OIL FILED WELL#1162 BHA YENANGYAUNG WELL#3255 BHA CHAUK DEEP TEST WELL# CDT-12 BHA

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CHAUK OIL FIELD WELL# 1162 BHA

3.5” DRILL PIPE

4.75” DRILL COLLARS X 4 JTS

‘X’ OVER SUB (6 ½” X 4 ¾”)


8.5” STABILIZER

6.5” DRILL COLLARS X 1 JT8.5” STABILIZER6.5” DRILL COLLARS X 2 JTS6.5” BIT SUB8.5” BIT TOTAL BHA LENGTH-287.7 FT.

DIRECT DRILLED DOWN TO 2800 FT WITH 8.5 “ PDC BIT.THE DRILLING OPERATION IS SMOOTHBUT UNFORTUNATELY,PIPE STUCK WHEN POOH AFTER CIRULATION AT TDTRIED TO PULLED WITH OVER PULL 165 KLBSUNSUCCESSFUL AND CUT THE STRING WITH SCHLUMBERGER.RECOVERED ALL DP &3 JTS OF 4 ¾” DC.

DRILLING PARAMETERS

AVG ROP-10.77 FT/HRRPM-100WOB-2.2KLBSGPM-258MUD TYPE-KCL PHPA POLYMERMUD WEIGHT-8.9 PPGVISCOSITY-49

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YENANGYAUNG OIL FIELD WELL#3255 BHA

3.5” DRILL PIPE

‘X’ OVER SUB (3 ½” X 4 ½ ”)

4.00” DRILL PIPE X 30 JTS

5.00” HWDP X 5 JTS


8.5” STABILIZER


6.5” BIT SUB8.5” PDC BIT TOTAL BHA LENGTH-345.75 FT.

WELL DEPTH-4691 FT.

DRILLING PARAMETERS

AVG ROP-11.30RPM-100WOB-4.4 KLBSGPM-246MUD TYPE- KCL PHPA POLYMERMUD WEIGHT-10 PPGVISCOSITY-48

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5.00” DRILL PIPE‘X’OVER SUB


6.25” DRILLING JAR X 1 JTS

‘X’OVER SUB6.25” DRILL COLLARS X 1 JTS

‘X’OVER SUB

8.375” STABILIZER‘X’OVER SUB

6.25” DRILL COLLARS X 1 JTS6.25” NM*DRILL COLLARS X 1 JTS6.25” BIT SUB WITH FLOAT VALVE AD TOTCO RING8.375” PDC BIT TOTAL BHA LENGTH -990.7 FEET .

CHAUK DEEP TEST WELL# CDT-12 BHA

WELL DEPTH-11890 FT

DRILLING PARAMETERS

AVG ROP- 12.1RPM-40/60/70WOB-12-23 KLBSGPM- 750MUD TYPE-KCL PHPA POLYMERMUD WEIGHT-14.3 PPGVISCOSITY- 70 SEC/QUT

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5.00” DRILL PIPE

‘X’ OVER SUB (5 ½” X 5”)

5.5” DRILL PIPE


6.25” DRILLING JAR X 1 JTS‘X’OVER SUB6.25” DRILL COLLARS X 12 JTS

6.25” BIT SUB WITH FLOAT VALVE

8.375” TCI BIT TOTAL BHA LENGTH -801.35 FEET .

CHAUK DEEP TEST WELL# CDT-12 BHA

THE LAST REAMINGTCI BIT ASSEMBLY FOR WELL TOTAL DEPTH OF 11800 FT.

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DIRECTIONAL HOLE DRILLING.

THE ART OF CONTROLLING THE ROTARY DRILL’S DIRECTIONAL AND ANGULAR TENDENCIES OF PENETRATING THE EARTH SURFACE TO A SPECIAL SUB-SURFACE TARGET.

METHOD OF DEFLECTION.

WHIPSTOCK KUNCKLE JOINT SPUD BIT DRILLING JET BIT DRILLING MUD MOTOR

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WHIPSTOCK

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WHIPSTOCK

(a)ON BOTTOM IN ORIENTPOSITION(b) DRILLING RAT HOLE(c ) REMOVE WHIPSTOCK(d) OPENING RAT HOLE TO FULL GAUGE WITH HOLE OPENER

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WHIPSTOCK

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KNUCKLE JOINT

KNUCKLE JOINT IS A DEFLECTION TOOL PLACED ABOVE THE DRILL BIT IN THE DRILL STEM,WITH A BALL AND SOCKET ARRAGEMENT THAT ALLOWS THE TOOL TO BE DEFLECTED AT AN ANGLE ;USED IN DIRECTIONAL DRILLING.USEFUL IN FISHING OPERATIONS BECAUSE IT ALLOWS THE FISHING TOOL TO BE DEFLECTED TO THE SIDE OF THE HOLE,WHER A FISH MAY HAVE COME TO REST.

KICK OF WITH A KNUCKLE JOINT

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SPUD BIT DRILLING

USED IN SOFT FORMATION FOR CHANGING DIRECTIONAL OF THE HOLE.

VERY IMPORTANT TO REAMING BEFORE DRILLINGBACK.

FROM DIRECTIONAL SURVEYS,IT CAN BE DETERMINED HOW MANY TIMES THE SPUDDING IS NECESSARY.

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JET BIT DRILLING

KICKING OFF THE ANGLE BY JET ACTION.

USED SPECIAL TYPES OF BIT WITH ONE NUMBER OF JET.

SURVEY INCLINATION,KOP, AND POOH.

WHEN REACHING DESIRED ANGLE,RUN DESIRED BHA AND DRILL AHEAD.

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ADJUSTABLE KICK-OFF MOTOR(AKO)

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HOLE INCLINATION THE ANGLE AS MEASURED BETWEEN THE WELL BORE AND VERTCAL

SOME DIRECTIONAL TERMS

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FOR DIRECTIONAL WELL,THE HIGH FLOW RATE (TURBULENT FLOW) MUST HAVE ALONG THE ANGLE.

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WHAT IS MWD?

MEASUREMENT WHILE DRILLING(MWD)SYSTEMS MEASURE FORMATION PROPERTIES(Eg: RESISTIVITY, NATURAL GAMMA RAY,POROSITY),WELLBOREGEOMETRY(INCLINATION,AZIMUTH),DRILLING SYSTEM ORIENTIATION(TOOLS FACE) AND MECHANICAL PROPERTIES OF THE DRILLING PROCESS.

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MWD

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LWD Sonic Travel Time

Resistivity and Conductivity

Eaton’s Equations (R, C, Dt, dc)

Natural Gamma Ray

Other…

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LWD

PARAMETRES CONSIDERATION BASE ON LWD RESULTS

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LWD

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5.00” DRILL PIPE


6.5” DRILL COLLARS X 2 JTS‘X’OVER SUB


6.5” MUD MOTOR

8.5” PDC BIT TOTAL BHA LENGTH -219.75 FEET .

DRILLING PARAMETERS

ROP-28.7 FT/HRRPM-60WOB-6.6KLBSGPM-399MUD TYPE-KCL POLYMER PHPAMUD WEIGHT-8.7PPGVISCOSITY-55 SEC/QUT

CHAUK OIL FIELD # CHK-1167DIRECTIONAL DRILLING

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5.00” DRILL PIPE



‘X’OVER SUB6.5” DRILL COLLARS X 1 JTS

8.25” SHORT STABILIZER‘X’OVER SUB

6.5” SHORT DRILL COLLARS X 1 JTS

6.5” MUD MOTOR

8.5” PDC BIT TOTAL BHA LENGTH -226.74 FEET .

DRILLING PARAMETERS

ROP-28.7 FT/HRRPM-60-100WOB-4.4 KLBSGPM-479MUD TYPE-KCL POLYMER PHPAMUD WEIGHT-9 PPGVISCOSITY-54 SEC/QUT

CHAUK OIL FIELD # CHK-1167DIRECTIONAL DRILLING

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THANK YOU FOR SHARING YOUR

PERSONNEL TIME ON MY PRESENTATION.

Engineering

BHA components and performances