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Rrx Mwd - Copy

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8/9/2019 Rrx Mwd - Copy http://slidepdf.com/reader/full/rrx-mwd-copy 1/20  S  c h l  u m  b  e r  g  e r P r i v  a  t  e Measurement While Drilling Overview
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Page 1: Rrx Mwd - Copy

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Measurement While DrillingOverview

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2 Initials

MWD Functions Real-time surveying 

Wellbore positioning

Directional Drilling

Real-time formation measurement

transmission

Correlation

Geology

Petrophysics

Geosteering

Real-time drilling mechanics data

Help Drilling process

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3 Initials

Schlumberger MWD SystemsHole

sizesSlimPulse From 4 ¾” to 30” 

Impulse From 5 ½” to 7 ¼

PowerPulse From 7 ¾” to 30” 

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4 Initials

Schlumberger MWD Systems(Services) 

MWD Systems

TransmissionRate

(Bit per second)

Combinability Remarks

SLIMPulse 0.5 ARC (gamma/resistivity)

 AIM (inclination)-PWD

Retrievable

Battery powered

IMPulse 0.5 - 3 ADN4 (Neutron/density)

Combine both MWD and

 ARC

Turbine powered

PowerPulse 0.5 -16 All LWD tools Turbine powered

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5 Initials

MWD Surveying – Is it important?(1) 

While Drilling......... We want to

1- Control the position of wellbore versus Geological model2- React when unexpected events are encountered

3- Anticipate unexpected structural events

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6 Initials

-

.

- -

 

. .

  . .

- . .

 

. - .

  .

-1200 -1000 -800 -600 -400 -200 0 200 400 600 800

-600

-400

-200

0

200

400

-1200 -1000 -800 -600 -400 -200 0 200 400 600 800

-600

-400

-200

0

200

400

Default Color 

 Main

Proposal

Survey

1600

1500

1400

1 3 0 0 

1   2   0   0   

A-3 H Plan

 2  3 2  5

 2  3 0 0

 2 2 0 0

  2 1  0  0

   2   0   0   0

   1    9    0    0

     1     8      0      0

1      7      0      0      

1     6     0    0    

1  5  0  0  

140 0 

1300

A-2 H Pilot Survey

  2  1   7   7

  2  1   7   7

   2   1   0   0

    2    0    0    0

    1    9    0    0

A-2 AH Survey

     2     1     0     0

      2      0      0      0

        1        9         0         0 

1         8         0        0        

1       7       0       0       

1       6       0       0       

A-1 H Survey

2 1 0 0 

2  0  0  0  

1    9    0    0    

1     8     0     0     

1        7        0        0        

       1       6        0        0 

       1       5        0        0 

       1       4       0 

       0 

       1       3        0 

       0 

       1       2       0        0 

A4H Plan

SPIDER VIEW

Scale (1 cm = 100 m)

 < < < 

 S O U T H 

 N O R T H 

 > > >

<<< WEST EAST >>>

MWD Surveying – Is it important?(2) 

X &Y uncertainties Z uncertainty

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7 Initials

3 magnetometers 3 accelerometers

MWD Surveying – D&I Package 

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8 Initials

MWD Surveying – Affected by? 

Magnetic data affected by any magnetic interferences•Bottom Hole assembly

•Nearby casing

•Magnetic storms

Inclinometer data affected by:• Accuracy limit

•Surveying procedures

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9 Initials

The telemetry – Data transmission(1) 

The mud pulse system

• by the Drilling MUD

 – MUD PULSE (positive or

negative)

 – MUD SIREN

Th t l t D t t i i

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10 Initials

The telemetry – Data transmission(2) 

MudMud

Pressure 

Time 

Pressure 

Time 

Mud 

Time 

Pressure 

Time 

Mud 

Pressure Pressure 

Time 

Positive Pulse: 1 BPS

Negative Pulse: 2BPS

Continuous wave:0.5 to 16 Bits Per Second

POWERPULSE

Th t l t D t t i i

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11 Initials

The telemetry – Data transmission(3) 

Th t l t D t t i i

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12 Initials

The telemetry – Data transmission(4) 

CODING PROTOCOLE:

Typical data is 6 to12 bits per “word”

Length of one “word” depends on the number

and the complexity of the data to transmit

Usual transmission priority is MWD then LWD

data

MWD+CDR+CDN

Frame # 24

Bits

Sync/ID/Err 27

gtf 8

PHSF_x 10

RHOS_x 10RHOL_x 10

TNRA_x 10

PERA_x 9

 ATTN_x 10

gtf 8

GRT_x 8

tur_rpm 7

PHSF_x 10

RHOS_x 10

RHOL_x 10

TNRA_x 10

gtf 8

PERA_x 9CDRSK_x 2

shock_I 8

 ATTN_x 10

GRT_x 8

PHSF_x 10

RHOS_x 10

gtf 8

RHOL_x 10

TNRA_x 10

 ATTN_x 10

3 bps UPDATE Secs

gtf 22

PHSF_x 29RHOS_x 29

RHOL_x 29

TNRA_x 29

PERA_x 29

 ATTN_x 44

GRT_x 44

shock_I 87

tur_rpm 87

CDRSK_x 87

Frame # 24 :

3 bits per second Programmed before the job

Depends on transmission mode

 Adjusted to expected ROP for optimum RTsampling rate

May be changed while drilling (depending on

contractors)

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13 Initials

MWD – Surface acquisition 

 A signal Pressure transducer senses pressure differences

•Sensed pressures are decoded with

the Acquisition System

•MWD Engineers QC

transmission and data

•Data is displayed on screen,

 And on paper Logs in the unit

• And

potentially

In Cutomer’s

office

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14 Initials

Signal Demodulation Principles

Type of signals – Downhole (MWD-Motor..)

 – Uphole (Pumps-Rig..)

 – Echoes & Reflections

 – Electrical Noise

Characteristics

 – Frequencies

 –  Attenuation

 – DirectionSNR = Signal Power/Bit

Noise Power

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15 Initials

SLIMPusle Retrievable MWD Tool (1) 

 Adaptable in different collar sizes from 3 ½” to 9 ½”

Covers flow ranges between 35 and 1200 GPM

Transmission rate of 0.5 BPS

Current MWD tool in use in Noyabrsk

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16 Initials

SLIMPusle Retrievable MWD Tool (2) 

Measures:

Direction and Inclination

Toolface

Shock

Optional gamma ray

Can be combined with:

 AIM (at Bit Inclination) and APWD

(Annuallar pressure) or

 ARC 375, 475, 675 (multidepth resistivity

Gamma ray

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17 Initials

IMPusle Tool (1) 

Tool size of 4 ¾” to be run in holes between 5 ½” to

7 ¼” 

Combine both MWD and ARC Services

Transmission rate between 0.5 and 3 BPS

Flow ranges between 130 to 400 GPM

Used in conjunction with PowerDrive475 RSS

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18 Initials

IMPusle Tool (2) 

Measures:

Direction and Inclination

Toolface

Shock

Up to 10 Resistivities

Gamma ray

Can be combined with:

 AIM4 (at Bit Inclination)

VPWD (Annuallar pressure)

Vision ADN4 (azimuthal density/Neutron)

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19 Initials

PowerPulse – MWD (1)

 MWD for 73/4 in. and larger hole sizes

MWD Collar sizes between 6 ¾” and 9

Fast data update at 0.5 to 16.0 bps

Flow ranges between 275 and 1200 G

Measures:

Direction and Inclination

Toolface

Multiple Shocks

Gamma rayDownhole weight on Bit

Downhole Torque

Collar RPM

Turbine RPM

Temperature

Drilling Mechanics

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20 Initials

PowerPulse – MWD (2)Tool Name Measurements type Tool size Remarks

 ARC Gamma rayMultidepth resistivity

6 ¾”, 8 ¼”, 9½”  2 MHz and 400 KHzpropagation resistivity.

GVR (RAB) Azimuthal gammaray

Bit resistivity

Highly focusedazimuthal resistivities

6 ¾”, 8”  Laterolog tool

VADN (VisionDensityNeutron)

Density, Neutron,Pef, ultrasonic caliper

4 ¾”, 6 ¾”, 8”  Azimuthal capability

ISONIC Delta-t 6 ¾”, 8”  Monopole SONICtools

SMWD(seismic MWD)

Check shots 5 ¾”, 8” 

NMR (Nuclear

MagneticResonnance)

Free water 6 ¾” 

PowerPulse

can be combined

With all LWD Tools


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