Casing Wear Tests

API STANDARD 7CW FIRST EDITION, JUNE 2015

REAFFIRMED, JULY 2020

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Foreword

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iii

Contents

Page

1. Scope 1

2. Normative References 1

3. Terms, Definitions, and Abbreviations 1

   1. Terms and Definitions 1

   2. Abbreviations 4

4. Testing 5

   1. General 5

   2. Casing Wear Test 5

   3. Open-hole Test Simulation 6

   4. Manufacturer Requirements 6

   5. Test Agency Requirements 10

   6. General Requirements for Qualification Testing Facility 10

5. Materials 11

   1. General 11

   2. Water-base Drilling Fluid 11

   3. Steel Test Specimen (base metal) 12

   4. Surface Coated Material Test Specimen 12

   5. Casing Specimen 12

   6. Abrasive Cylinder for Open-hole Simulation 12

6. Testing Procedure 12

   1. Surface Finish Roughness Profile 12

   2. Procedures 14

7. Reporting 15

Bibliography 18

Figures

1. Measurable Wear Groove Inside a Casing Tubular Created by Rotating Drill Stem Element,

   Typically a Tool Joint with Material Coating 5

2. Drill Stem Element Test Specimen with a Material Coating 6

3. Casing Wear Test Apparatus for Cased-hole Test Configuration 7

4. Material Coating Worn Away by Means of Abrasion 8

5. Aluminum Oxide Abrasive Cylinder Mounted in a Piece of Casing 8

6. Test Specimen Wear Apparatus for Open-hole Test Configuration. 9

7. Tipped Cantilever Measuring Surface Profile 13

8. Raw Roughness Profile 13

9. Casing Wear Test Procedures 14

Tables

1. Material and Amount Requirements 11

2. Test Specimen and Dimensional Requirements 12

v

Casing Wear Tests

1. Scope

   It is the intent of this standard to provide a method by which results will be reproducible, under a specified set of conditions, for conducting tests that determine casing wear due to rotation of drill stem elements.

   
   

   This standard is intended to be used in a laboratory environment and is not intended for use in the field during operations. The testing requirements in this standard are not represented at well conditions. This standard is divided into four major areas: machine apparatus, procedures, materials, and reporting.

   
   

   This standard will not address the significance of specific data values. It is the responsibility of the user of this standard to establish the appropriate test data values that are acceptable based on their respective application, operational limitations, and safety practices.

   
   

2. Normative References

   The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

   
   

   API Manual of Petroleum Measurement Standards Chapter 10.4, Determination of Water and/or Sediment in Crude Oil by the Centrifuge Method (Field Procedure)

   
   

   API Recommended Practice 13B-1, Recommended Practice for Field Testing Water-Based Drilling Fluids

   
   

   API Recommended Practice 19C, Measurement of Properties of Proppants Used in Hydraulic Fracturing and Gravel- Packing Operations

   
   

   API Specification 5CT, Specification for Casing and Tubing

   
   

   API Specification 5DP, Specification for Drill Pipe

   
   

3. Terms, Definitions, and Abbreviations

3.1 Terms and Definitions

For the purposes of this document, the following definitions apply.

3.1.1

asperity

Protuberance in the small-scale topographical irregularities of a solid surface.

3.1.2

axial friction factor

Ratio of frictional force and contact force between the test specimen and the casing while sliding (not rotating).

3.1.3

axial-load

Force imparted by the tool joint specimen against the inside casing wall.

1