GUIDELINES FOR EFFECTIVE HOLE CLEANING IN DIRECTIONAL WELLS

50 %
50 %
Information about GUIDELINES FOR EFFECTIVE HOLE CLEANING IN DIRECTIONAL WELLS
Technology

Published on March 8, 2014

Author: mohan153doshi

Source: slideshare.net

Description

A GUIDELINE TO BEST PRACTICES FOR EFFICIENT HOLE CLEANING IN DIRECTIONAL WELLS

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 1

TWO PRIMARY ACTIVITIES ASSOCIATED WITH DRILLING A WELL  1. PENETRATING SUBTERRANEAN FORMATIONS WITH THE DRILL BIT.  2. REMOVING THE DRILLED MATERIAL FROM THE HOLE THUS DRILLED  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 2

THIS LATTER PROCESS WHICH WE CALL HOLE CLEANING DOES NOT GET THE ATTENTION IT DESERVES  WE MERELY ASSUME THAT THE ACT OF CIRCULATING DRILLING MUD UP AND DOWN THE HOLE CAN TAKE CARE OF THIS ACTIVITY.  THIS MAY SOMETIMES BE TRUE IN VERTICAL WELLS BUT IT IS SELDOM THE CASE IN DRILLING HIGH ANGLE DEVIATION WELLS  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 3

IN THESE HIGH ANGLE DEVIATED WELLS THE CUTTINGS FOLLOW A COMPLEX AND TORTUROUS PATH TO THE SURFACE IN WHICH SOME OF THE CUTTINGS GRAVITATE TO THE LOW SIDE OF THE HOLE.  FAILURE TO CLEAN THESE CUTTINGS OUT OF THE BOREHOLE LEADS TO MANY SERIOUS PROBLEMS WE ENCOUNTER IN THESE WELLS.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 4

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 5

THE RATIO OF THE RATE AT WHICH THE CUTTINGS ARE REMOVED FROM THE HOLE TO THE RATE AT WHICH THEY ARE GENERATED AT THE BIT IS THE HOLE CLEANING RATIO. IDEALLY WE WOULD LIKE THIS TO BE = 1. BUT IT WOULD BE A COINCIDENCE IF THIS WERE TO ACTUALLY HAPPEN – YOU HAVE TO BE LUCKY TO GET THIS IDEAL SCENARIO. NORMALLY THE RATE OF CUTTING REMOVAL LAGS THE RATE OF CUTTING GENERATION GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 6

THIS LAGGING BEHIND LEADS TO ACCUMULATION OF SOME CUTTINGS IN THE HOLE.  SO LONG AS THIS ACCUMULATION DOES NOT HAMPER NORMAL OPERATIONS YOU CAN TOLERATE IT. BUT WHEN THIS ACCUMULATION STARTS HAMPERING OUR NORMAL OPERATIONS WE ARE IN TROUBLE.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 7

CUTTINGS CAN BE DEGRADED CHEMICALLY AND PHYSICALLY WHILE STILL IN THE ANNULUS.  DEGRADATION/DISPERSION OF THE CUTTING IN THE ANNULUS MUD STREAM DECREASES THE SIZE OF THE CUTTINGS LEADING TO AN IMPROVEMENT IN THE HOLE CLEANING EFFICIENCY  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 8

DISPERSION OF CUTTINGS INTO THE MUD STREAM CAN HAVE SERIOUS UNDESIRABLE EFFECTS ON THE PROPERTIES OF THE MUD. SOBMs DO NOT ALLOW THE CUTTINGS TO DISPERSE IN THE MUD OR DEGRADE IN THE MUD AND HENCE THEIR HOLE CLEANING EFFICIENCIES ARE LESS AS COMPARED TO WATER BASED MUDS WHICH AID DISPERSION OF CUTTINGS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 9

SMALL VOLUME OF CUTTINGS AT THE SHAKER AS COMPARED TO THE VOLUME OF THE HOLE DRILLED. LARGE AMOUNT OF FILL AFTER TRIPS INCREASING DRAG INCREASING TORQUE REGROUND (SMALL AND ROUNDED) CUTTINGS INCREASED ECD AS MEASURED BY THE PWD TOOL GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 10

LOST CIRCULATION DUE TO PACK OFF OR HIGH ECD STUCK PIPE HIGH TORQUE AND DRAG DIFFICULTIES IN RUNNING AND CEMENTING CASING DIFFICULTY IN GETTING THE LOGGING TOOLS TO THE REQUIRED DEPTH GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 11

HOLE SIZE HOLE ANGLE ROP FLOW RATE DRILLING FLUID PROPERTIES PIPE ROTATION CUTTINGS SIZE AND SHAPE MINERALOGY OF THE CUTTINGS GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 12

THE BEHAVIOR OF CUTTINGS IN THE WELL BORE IS LARGELY DEPENDENT ON THE ANGLE OF INCLINATION OF THE WELL BORE  WE CAN CLASSIFY WELL BORES INTO THREE TYPES  › STRAIGHT OR NEAR STRAIGHT › HIGH ANGLE HOLES › EXTREMELY HIGH ANGLE HOLES GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 0 - 300 30 - 650 65 - 900 13

 DRILL CUTTINGS EXHIBIT DISTINCTLY DIFFERENT BEHAVIOR IN EACH OF THESE HOLE TYPES  EACH WELL TYPE REQUIRES DIFFERENT CONSIDERATIONS WITH RESPECT TO EFFICIENT HOLE CLEANING. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 14

THE MOTION OF THE CUTTINGS IS THE STRAIGHT HOLE IS LARGELY DOWNWARD WHEN THERE IS NO CIRCULATION AND UPWARD WITH CIRCULATION 15

THE VECTOR OF THE DOWNWARD MOTION IS CONTROLLED BY THE FORCE OF GRAVITY AND IS INFLUENCED BY: • BUOYANCY • VISCOSITY OF THE DRILLING FLUID • SIZE OF THE PARTICLE THE UPWARD MOTION OF THE PARTICLE IS GOVERNED BY ALL OF THESE AND BY THE VELOCITY OF THE DRILLING FLUID. THE MATTER OF HOLE CLEANING IS A MATTER OF SUFFICIENT CIRCULATION OF THE WELLBORE GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 16

LIFE BECOMES SLIGHTLY COMPLEX HERE DUE TO THE TENDENCY OF THE CUTTINGS TO SETTLE ON THE LOW SIDE OF THE HOLE EVEN WHEN MOVING UP DUE TO CIRCULATION OF THE MUD. THE AVALANCHING OF THE CUTTINGS IN THESE HOLES MAKES THEM THE MOST DIFFICULT TO CLEAN. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 17

CUTTINGS TEND TO SETTLE ON THE LOW SIDE OF THE HOLE BUT WHEN CIRCULATION IS STOPPED THE CUTTING DO NOT AVALANCHE DOWN THE WELLBORE WHEN CIRCULATION IS STOPPED GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 18

ANNULAR VELOCITY   HIGHER THE BETTER IS A GOOD RULE OF THUMB PROVIDED THE FORMATIONS ARE COMPETENT IN STRAIGHT HOLES MUD VISCOSITY AND ANNULAR VELOCITY ARE THE ONLY CONSIDERATIONS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 19

 FOR HIGH ANGLE AND EXTREME HIGH ANGLE WELLS IT IS NECESSARY TO OPTIMIZE THE ANNULAR VELOCITY WITH THE HIGHEST PRACTICAL FLOW RATE  BUT THIS FACTOR WILL NOT OBTAIN ADEQUATE HOLE CLEANING. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 20

RECOMMENDED MINIMUM FLOW RATES AND ANNULAR VELOCITIES HOLE SIZE INCHES FLOW RATE GPM ANNULAR VELOCITY FT/MIN 17 1/2 900 – 1200 76 – 100 12 1/4 700 – 1000 133 – 190 9 7/8 600 – 850 197 – 279 8 1/2 400 - 600 202 - 303 GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 21

HOLE SIZE IS A MAJOR FACTOR IN HOLE CLEANING. ANNULAR VELOCITY OF 140 FT/MIN OR MORE IS HIGHLY DESIRABLE IN HIGH ANGLE WELLS BUT THESE RATES CAN BE ACHIEVED ONLY IN SMALLER HOLES HOLE SIZE 17 ½ AND LARGER 14 ¾ AND 12 ¼ 9 CHARACTERISTICS EXTREMELY DIFFICULT TO CLEAN. PROBLEM COMPOUNDED BY USE OF SOBMs. LUCKILY WE DON’T USE SOBMs IN THESE SECTIONS. ALL AVAILABLE TOOLS AT HAND MUST BE BROUGHT INTO PLAY TO CLEAN THE HIGH ANGLE WELLS OF THIS SIZE HOLE CLEANING REMAINS A PROBLEM IN THESE HOLE SIZES TOO. SOBMs ARE FREQUENTYLY USED IN THESE SECTIONS COMPOUNDING HOLE CLEANING PROBLEMS. HOLE CLEANING BECOMES EASIER IN THESE SECTIONS IF GOOD 7/8 PRACTICES ARE FOLLOWED. 22 GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 23

 THE DRILL PIPES AND CUTTINGS LIE ON THE LOW SIDE OF THE HOLE.  THE AREA OF THE HIGHEST FLUID VELOCITY TENDS TO BE AT THE HIGH SIDE OF THE HOLE WHILE THE LOW SIDE CONTAINS AN AREA OF LOW FLOW RATE THAT IS EFFECTIVELY A DEAD ZONE GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 24

THIS TYPE OF FLOW PROFILE CREATES HUGE PROBLEMS WHEN THE CUTTINGS SETTLE INTO A SPACE OF LITTLE OR NO FLOW ON THE LOW SIDE OF THE HOLE. THE EFFECT GETS MORE PRONOUNCED AS THE PIPE ECCENTRICITY INCREASES THE CLEANING DEPENDS ON REMOVING THE CUTTING FROM THE LOW SIDE OF THE HOLE INTO THE AREA OF HIGH FLOW. D/P ROTATION IS THE MOST EFFECTIVE TOOLS FOR ACHIEVING THIS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 25

   THE CUTTINGS MOVE UP-HOLE INTO THE HIGH FLOW AREA UNTIL THEY ONCE MORE SETTLE INTO THE DEAD SPACE ON THE LOW SIDE OF THE HOLE. THEN THEY ARE THROWN INTO THE MAIN STREAM BY THE ROATION OF THE D/P THIS START STOP PRACTICE CONTINUES UNTIL THE CUTTINGS REACH THE STRAIGHT HOLE SECTION AND ARE CIRCULATED OUT GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 26

   THE CUTTINGS IN THE START-STOP MOTION ARE ABRADED MECHANICALLY BY THE D/P ROTATION AND BECOME SMALLER AND ROUNDED. THIS UP AND DOWN JOURNEY IS SLOW AND TAKES LONGER THAN THE BOTTOMS UP TIME EVEN WITH OPTIMUM D/P ROTATION. WITHOUT D/P ROTATION THE CUTTINGS BED MAY REMAIN IN PLACE WITH VERY LITTLE UPWARD MOTION AND MAY EVEN SLIDE DOWNWARDS WHEN CIRCULATION IS STOPPED GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 27

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 28

THERE IS A GREAT DIFFERENCE IN THE CUTTINGS REMOVAL FROM 100 AND 120 RPM  A SIMILAR CHANGE OCCURS BETWEEN 150 AND 170 RPM  OPTIMUM PIPE ROTATION IS THE SINGLE MOST EFFECTIVE WAY TO OBTAIN SIGNIFICANT INCREASES IN HOLE CLEANING  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 29

HOLE SIZE – (INCHES) MINIMUM PIPE ROTATION SPEED RPM 17 1/2 120 12 1/4 120 9 7/8 120 8 1/2 80 GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 30

INCREASING VISCOSITY TO CLEAN THE HOLE USUALLY WORKS IN A STRAIGHT HOLE.  17 ½”AND 20” HOLES ARE GENERALLY DRILLED WITH A LOW MUD WEIGHT SO THEY CAN BE CLEANED BY INCREASING THE VISCOSITY OF THE MUD WHERE Yp > Pv IN ORDER TO OVERCOME THE LOW BUOYANCY AND THE LOW ANNULAR VELOCITY OF THE MUD.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 31

IN SMALLER HOLES MUD WT. AND ANNULAR VELOCITY INCREASE AND HOLE CLEANING IMPROVES ACCORDINGLY.  IN SMALLER HOLES ECD IS ALSO AN IMPORTANT FACTOR TO BE CONSIDERED IN DETERMINING THE OPTIMUM VISCOSITY OF STRAIGHT HOLES.  HIGHER ANNULAR VELOCITY ALLOWS FOR USE OF LOVER FLUID VISCOSITY WITHOUT COMPROMISING THE CLEANING EFFICIENCY.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 32

HIGH VISCOSITY DOES NOT NECESSARILY PROMOTE IMPROVED HOLE CLEANING IN DEVIATED HOLES. BOTH HI VIS AND LOW VIS ARE DETRIMENTAL TO HOLE CLEANING IN THESE WELLS. A RANGE OF MODERATE VISCOSITY PROMOTES THE BEST HOLE CLEANING. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 33

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 34

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 35

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 36

HIGH VISCOUS SWEEPS CAN BE EFFECTIVE IN STRAIGHT HOLES BUT THEY ARE NOT VERY HELPFUL IN HI ANGLE HOLES. IN FACT THEY CAN BE DETRIMENTAL TO HOLE CLEANING IN HI ANGLE HOLES THIS IS DUE TO THE FACT THAT HI VIS SWEEPS CAN ENLARGE THE DEAD ZONE ON THE LOW SIDE OF THE HOLE GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 37

HIGH DENSITY SWEEPS ARE VERY EFFECTIVE IN REMOVAL OF CUTTING BEDS AND HAVE BECOME STANDARD PRACTICE IN THE DRILLING OF HI ANGLE HOLES.  THEY ARE TYPICALLY WEIGHTED UP 1 TO 3 PPG (0.12 TO 0.36 SG) OVER THE BASE MUD AND VISCOSITY IS NOT INCREASED BEYOND WHAT THE ADDITIONAL WEIGHING MATERIAL CONTRIBUTES.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 38

THESE SWEEPS ARE SMALL IN VOLUME (30-50 BBL) USUALLY 200 – 500 FT OF ANNULAR HEIGHT. SO THE DANGER OF INCREASING THE HYDROSTATIC HEAD OF THE MUD COLUMN AS THE SWEEP MOVES UP THE ANNULUS IS AVOIDED. LARGE SWEEPS ARE ALSO PROBLEMATIC WHEN THE CUTTING BEDS ARE LARGE. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 39

THIS IS BECAUSE THE SWEEP CAN PICK UP ENOUGH MATERIAL TO OVERLOAD THE ANNULUS WITH CUTTINGS CREATING A POTENTIAL PACK OFF. HENCE IT IS A GOOD IDEA TO USE A SMALLER HI DENSITY SWEEP AND CIRCULATE OUT THE CUTTINGS BEFORE GOING IN FOR ANOTHER SWEEP. GOOD SHALE SHAKER DISCIPLINE IS REQUIRED HERE, TO BE AWARE OF THE CUTTINGS COMING OUT BEFORE SWEEPING THE HOLE WITH THE NEXT HI DENSITY SWEEP GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 40

SOMETIME BACK I HAD TALKED OF VERY FINELY GROUND BARITE – THE WARP WHILE WE WERE DISCUSSING BARITE SAG.  NOW I WILL TALK ABOUT VERY COARSE GROUND BARITE IN MAKING THESE HIGH DENSITY SWEEPS.  IT HAS BEEN FOUND THAT COARSE BARITE IS MORE EFFECTIVE THAN NORMAL BARITE THAT IS USUALLY USED IN WEIGHING UP THE MUD.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 41

THE SCOURING EFFECT OF THE COARSE BARITE IS THOUGHT TO PLAY A ROLE IN THE INCREASED EFFICIENCY OF COARSE BARITE TO REMOVE THE CUTTING BEDS. “SWEEP WATE” IS A PATENTED PRODUCT BY BAROID WHICH IS EMPLOYED IN MAKING THESE HIGH DENSITY SWEEPS. COARSE NUT HULLS ARE ALSO EMPLOYED IN THE PREPARATION OF HIGH DENSITY SWEEPS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 42

THE OTHER ADVANTAGE OF USING COARSE MATERIAL IS THAT THIS CAN BE PARTIALLY REMOVED BY THE SOLIDS CONTROL EQUIPMENT AT THE SURFACE.  SO THE INCREASE IN THE MUD WEIGHT DUE TO FREQUENT USE OF THESE SWEEPS IS MINIMIZED.  WITH NORMAL GROUND BARITE EMPLOYED FOR THE HIGH DENSITY SWEEPS, DILUTION BECOMES NECESSARY.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 43

DISADVANTAGES DILUTION HIGH VOLUMES GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI HIGH COSTS 44

ONE SHOULD HAVE A REGULAR PROGRAM FOR EMPLOYING THESE HIGH DENSITY SWEEPS. FREQUENCY DEPENDS ON THE HOLE SIZE AND ROP TYPICALLY THESE SWEEPS ARE EMPLOYED FOR EVERY 1-3 STANDS DRILLED. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 45

HIGH DENSITY SWEEPS (1-3 BBL OVER THE BASE MUD WEIGHT) 50 – 60 BBL SWEEP 17 ½” HOLE 12 ¼ ” HOLE 8 ½ ” HOLE GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI EVERY 1-2 STANDS 30 – 40 BBL SWEEP EVERY 1 – 3 STANDS 20 – 30 BBL SWEEP EVERY 3 – 5 STANDS 46

IT IS IMPORTANT TO CIRCULATE AT DRILLING FLOW RATE WITH OPTIMUM PIPE ROTATION DURING THE ENTIRE TIME THE SWEEP IS IN THE HOLE. FOR FLOATING DRILLING RIGS WITH SUB SEA STACKS, THE SWEEP NEED ONLY BE IN THE RISER WHEN CIRCULATION THROUGH THE DRILL STRING STOPS. A BOOSTER PUMP CAN BE EMPLOYED TO KEEP THE SWEEP IN THE RISER MOVING UPWARDS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 47

CUTTING BEDS ARE FREQUENTLY COMPOSED OF VERY FINE PARTICLES DUE TO THE GRINDING EFFECT OF THE BHA AND THE DRILL PIPE.  CUTTING BEDS ALSO CONTAIN BARITE WHICH HAS SAGGED TO THE LOW SIDE OF THE HOLE IF THE WEIGHTED MUDS ARE BEING USED.  THESE FINE MATERIALS MAY NOT BE VISIBLE ON THE SURFACE UNLESS VERY FINE SHALE SHAKER MESHES (> 175 MESH) ARE EMPLOYED.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 48

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 49

IN HIGH ANGLE WELLS BOTTOMS UP OF THE MUD IS NOT THE BOTTOMS UP FOR THE CUTTINGS. EXTENDED CIRCULATION TIMES ARE THEREFORE NECESSARY FOR GOOD HOLE CLEANING EFFICIENCY. THIS HAS TO BE ACCEPTED WITHOUT RESERVATION IN OPERATIONS ON THIS TYPE OF HOLE. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 50

THE HOLE SHOULD BE CIRCULATED WITH D/P ROTATION FOR AT LEAST 10 – 15 MIN BEFORE MAKING A CONNECTION TO MOVE THE CUTTINGS AWAY FROM THE BHA BEFORE CIRCULATION IS STOPPED.  WHEN DRILLING WITH VERY HIGH ROP OR AFTER SLIDING A KELLY LENGTH SYMPTOMS LIKE JERKY TORQUE AND FLUCTUATING PUMP PRESSURE ARE SURE SHOT INDICATORS THAT EXTENDED CIRCULATION IS NEEDED TO FLUSH THE HOLE OF EXCESSIVE CUTTINGS.  GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 51

THE HOLE MUST BE CIRCULATED CLEAN PRIOR TO TRIPS AND THIS MAY TAKE AS MUCH AS 4 TIMES THE BOTTOMS UP FOR SOME HIGH ANGLE WELLS. HOLE TYPE CIRCULATION TIME PRIOR TO TRIPS 0 – 30o 1.2 TO 1.8 TIMES BOTTOMS UP 30 – 65o 2.0 TO 2.5 TIMES BOTTOMS UP 65 – 90o 2.5 TO 3.5 TIMES BOTTOMS UP GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 52

 IT IS IMPORTANT TO REMEMBER THAT THESE ARE MERE GUIDELINES FOR GOOD HOLE CLEANING PRACTICES.  THE HOLE WILL NEVER BE PERFECTLY CLEAN BUT WE CAN LIVE WITH THE FACT THAT THE HOLE IS CLEAN ENOUGH TO TRIP WITHOUT EXCESSIVE OVERPULL DUE TO CUTTING BEDS. GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 53

THE ACTUAL TIME TO ACHIEVE AN EFFECTIVELY CLEAN HOLE WILL DEPEND ON THE ANNULAR VELOCITY, DETAILED HOLE GEOMETRY, SPEED OF PIPE ROTATION, VISCOSITY, MUD WEIGHT, CUTTING MINERALOGY, INHIBITIVE CHARACTERISTICS OF THE MUD AND THE COARSENESS/FINENESS OF THE WEIGHING MATERIAL GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 54

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 55

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 56

HOWEVER BACK REAMING HAS BEEN FOUND TO BE DANGEROUS IN HIGH ANGLE HOLE WELLS. THE OVER-PULL CONDITION IS USUALLY DUE TO THE DRAGGING OF THE BIT AND THE BHA INTO A CUTTINGS BED AND BACK REAMING CAN RESULT IN A CUTTING LOAD SO HIGH THAT IT MAY BURY THE BIT AND THE BHA. PACK OFF WITH LOST CIRCULATION AND/OR STUCK-PIPE IS OFTEN THE RESULT GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 57

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 58

GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 59

KEEP A COMPREHENSIVE PROGRAM FOR MUD CLEANING HANDY AT ALL TIMES THE FACTORS TO BE CONSIDERED ARE: FLOW RATE PIPE ROTATION HI DENSITY SWEEPS EXTENDED CIRCULATION GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 60

Thank You Very Much GUIDELINES TO EFFECTIVE HOLE CLEANING - DR. S. V. DOSHI 61

Add a comment

Related presentations

Related pages

Hole Cleaning in Directional Wells - Documents

Download Hole Cleaning in Directional Wells. Transcript. Recommended. GUIDELINES FOR EFFECTIVE HOLE CLEANING IN DIRECTIONAL WELLS
Read more

Hole cleaning - PetroWiki

Hole cleaning in directional-well ... on the low side of the hole can mitigate hole-cleaning problems ... guidelines for an effective weighted ...
Read more

Comprehensive Studies on Hole Cleaning and ECD Management ...

Effective hole cleaning and maintenance of an appropriate equivalent circulating density ... in a geothermal directional well recently drilled in Japan.
Read more

Directional Crossing Guidelines - Documents - DOCSLIDE.US

Share Directional Crossing Guidelines. ... GUIDELINES FOR EFFECTIVE HOLE CLEANING IN DIRECTIONAL WELLS
Read more

L8-Drill String Design in Directional Wells - Documents

Share L8-Drill String Design in Directional Wells. ... Tubular Mechanics in Oil-Gas Wells Sand Problem in Oil Wells ...
Read more

Using Casing to Drill Directional Wells - Schlumberger

Using Casing to Drill Directional Wells ... effective hole cleaning. ... onshore wells to drilling just one or two hole sections in offshore wells that ...
Read more

Directional | LinkedIn

View 169010 Directional posts, presentations, experts, and more. ... Offshore Drilling /Well Intervention at MnM (Corporate Communicator)
Read more

Cuttings Transport in Directional and Horizontal Wells ...

Cuttings Transport in Directional and Horizontal Wells While ... in directional wells drilled ... or hole cleaning in underbalanced ...
Read more

Directional | LinkedIn

Consultant Senior Directional Drilling Supervisor at Welldrill Energy Past Senior ERD Adviser at Merlin, ...
Read more