Determining Cement Compressive Strength Rev01

Compressive Strength of Cement Slurries

January 7, 2003

Procedure for Determining The Compressive Strength of Cement Slurries Table of Revisions Date

Revision

Description of Changes

1/5/2002

00

Initial Issue

01/07/2003

01

Changed temperature controller setup.

Reviewers’ Name:

Doug Wakelam

Reviewers Signature: Technical Reviewers Name:

Dave Stiles

Technical Reviewers Signature: Approved for Issue by:

Cheryl Fontana

Approval Signature:

WWC-WSC-6.2-PRO-031

Rev:01

Once printed or downloaded this document is no longer controlled and may not be the most recent version. See:www.calgary.oilfield.slb.com/shared_services/qhse/sabdocs/sab.cfm

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Compressive Strength of Cement Slurries

January 7, 2003

Procedure for Determining The Compressive Strength of Cement Slurries 1.1

Scope Procedure for determining the compressive strength of all cement slurries in the Red Deer Laboratory.

1.2

Objective The objective of this procedure is to ensure that all thickening time tests are conducted uniformly and according to current API Standards.

2.0

Responsibilities

2.1

Implementation All Dowell Schlumberger Red Deer laboratory personnel charged with conducting this test procedure.

2.2

Accountability The responsibility for implementing this procedure lies with the Lab Manager.

2.3

Verification Verification of the implementation of this procedure is the responsibility of the Lab Manager, on behalf of the Dowell Operations Manager.

2.4

Verification Method Verification is by scheduled audits.

3.0

References API Recommended Practice 10B, Twenty-Second Edition, December 1997. Ultrasonic Cement Analyzer Manual No. 458.9725 – Halliburton Model 5270 Data Acquisition Software Manual and Help File.

WWC-WSC-6.2-PRO-031

Rev:01

Once printed or downloaded this document is no longer controlled and may not be the most recent version. See:www.calgary.oilfield.slb.com/shared_services/qhse/sabdocs/sab.cfm

2

Compressive Strength of Cement Slurries

4.0

Procedure

4.1

Materials and Equipment

January 7, 2003

Ultrasonic Cement Analyzer Computer with Chandler 5270 system. All Materials and equipment must be clean and in good operating order. 4.2

Preparing Materials 4.2.1 4.2.2 4.2.3 4.2.4 4.2.5 4.2.6 4.2.7 4.2.8 4.2.9 4.2.10 4.2.11 4.2.12 4.2.13 4.2.14 4.2.15 4.2.16 4.2.17 4.2.18 4.2.19 4.2.20 4.2.21 4.2.22 4.2.23 4.2.24 4.2.25 4.2.26 4.2.27 4.2.28 4.2.29 4.2.30 4.2.31

4.3

Cement slurry must be prepared using Lab Procedure WWC-WSC-6.2-PRO-028. Condition cement slurry in the Atmospheric Consistometer using Lab Procedure WWC-WSC-6.2-PRO-024. Set temperature controller to required set points and heat up/cool down rates. Set heater output to a value close to or slightly less then the test temperature. Maximum value is 70. Setting up UCA cell. Make sure the o-rings are in good condition and the cell cleaned. Apply a thin coat of high temperature grease inside the cylinder, on the plug ends, orings, and sealing rings. Ensure that all cell parts match (all parts are stamped with #) Place the bottom plug in the cell and tighten (Top of cell is marked with a T). Pour the conditioned cement slurry in the UCA cell using gauge stick to insure the proper volume is used. Screw the top plug in place (hand tight) and fill with water. Place a thin coat of high temperature ultrasonic couplant on the transducer faces. Clean the cell and place in the autoclave by turning the cell clockwise (only) aligning the pressure fittings. Place the sensor in the top plug. Place the spring, spacer, and sensor retainer in place over the top sensor. Attach the high pressure line to the cell and tighten fittings with a wrench. Install thermocouple in the high pressure port. Tighten with wrench. Close vent valve and open pressure valve. Set test pressure on pressure controller (same for all tests). Close chamber vent valve on cell. Open chamber supply valve. Check for leaks. Start temperature controller. And turn on heater switch. Open cooling water valve if required. (Test temperature below 200C). Start test on computer. Select proper cell (1-3) Enter required information (Test #, Company name, location, additives, temperatures) Select proper weight setting – A – lightweight , B – normal, C – with hematite. Check test after 15-30 minutes to ensure proper operation and no leaks. Ending the test Turn the heater off. Open the cooling water valve if required Close pressure supply valve and open vent valve. Remove cell from UCA and clean.

Calculation and Recording of Results Results should be recorded (plot) and saved (file) following completion of the test. Temperatures for the Bottom Hole Circulating Temperature must be determined from API Spec 10 or using Cemcade.

WWC-WSC-6.2-PRO-031

Rev:01

Once printed or downloaded this document is no longer controlled and may not be the most recent version. See:www.calgary.oilfield.slb.com/shared_services/qhse/sabdocs/sab.cfm

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