Procedure for Measuring Leakoff of Completion Fluids Under Dynamic Conditions

ANSI/API RECOMMENDED PRACTICE 13M-6 FIRST EDITION, MAY 2020

ISO 13503-6:2012 (Modified), Petroleum and natural gas industries—Completion fluids and materials—Part 6: Procedure for measuring leakoff of completion fluids under dynamic conditions

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This American National Standard is under the jurisdiction of the API Subcommittee on Drilling and Completion Fluids. This standard is modified from the English version of ISO 13503-6:2012. ISO 13503-6:2012 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, SC 3, Drilling and completion fluids, well cements, and treatment fluids.

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Contents

Page

1. Scope 1

2. Terms and definitions 1

3. Cell type 1

4. Identification of test parameters (linear flow cells) 3

   1. General 3

   2. Temperature 3

1. Test duration 3

2. Shear rate 3

3. Permeability 3

4. Fluid shear-history simulator (optional) 4

5. Heat-up rate 4

1. Test procedure 4

   1. Core preparation 4

   2. Round cell 4

   3. Proppant conductivity cell 5

2. Calculations 5

   1. Shear rate 5

   2. Leakoff coefficients 6

3. Calculation examples 7

   1. Round cell — Linear gel 7

   2. Round cell — Crosslinked gel 8

   3. Proppant conductivity cell — Crosslinked gel 9

4. Report 10

Annex A (informative) Identification of Modifications 12

Bibliography 14

Figures

1. Schematic of a typical round cell 2

2. Schematic of a typical proppant conductivity cell 2

3. Dynamic fluid loss example—4,2 kg/m3 CMHPG (35 lb/Mgal)

   at 82 °C (180 °F), 6900 kPa (1 000 psi) 7

4. Dynamic fluid loss example—4,2 kg/m3 (35 lb/Mgal) Zr/CMHPG,

   at 121 °C (250 °F), 6 900 kPa (1 000 psi) 9

5. Dynamic fluid loss example—4,2 kg/m3 (35 lb/Mgal) Zr/CMHPG,

at 93 °C (200 °F), 6 900 kPa (1 000 psi) 10

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