Pressurized Curing Vessel

Pressurized Curing Vessel

Definition(s)

Pressurized Curing Vessel

Vessel used for curing a sample of cement under temperature and pressure for compressive strength testing. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Preflush

Preflush

Definition(s)

Preflush (Noun)

Fluid containing no insoluble weighting agents used to separate drilling fluids and cementing slurries. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Pozzolan

Pozzolan

Definition(s)

Pozzolan

Siliceous or siliceous and aluminous material which in finely divided form reacts with calcium hydroxide to form a cementitious material. NOTE See Clause 17 for further description. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Plug Cementing

Plug Cementing

Definition(s)

Plug Cementing

Process of placing a volume of cement in a well to form a plug across the wellbore. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Pressure-Down Rate

Pressure-Down Rate

Definition(s)

Pressure-Down Rate (Rpd)

Rate at which pressure is reduced from the bottom-hole pressure, pBH, to the pressure at the top of cement column, pTOC, during a thickening-time test. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Structural Pipe (or casing)

Structural Pipe (or casing)

Definition(s)

Structural Pipe (or casing)

Pipe utilized to facilitate the drilling of a well, but not intended for pressure containment after the well has been drilled. Supports unconsolidated sediments and provides hole stability for initial drilling operations, axial support for casing loads and bending loads from the wellhead. See also definition for drive/jet pipe. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  

Structural

Large OD casing; jetted in or drilled and cemented. Normal clearance casing OD in.: 30. Tight clearance casing OD in.: 36. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
Neat Cement Slurry

Neat Cement Slurry

Definition(s)

Neat Cement Slurry

Cement slurry consisting of only cement and water. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards
Static Gel Strength (SGS)

Static Gel Strength (SGS)

Definition(s)

Static Gel Strength (SGS)

The yield stress of fluids at rest. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  

Static Gel Strength (SGS)

Shear strength (stress) measurement derived from force required to initiate flow of a fluid. Source: API RP 10B-6, Recommended Practice on Determining the Static Gel Strength of Cement Formulations, Upstream Segment, First Edition, August 2010. Global Standards  
Mud Balance

Mud Balance

Definition(s)

Mud Balance

Beam-type balance used to measure fluid density at atmospheric pressure. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Mud Balance

Beam-type balance used in determining drilling fluid density. NOTE See ISO 10414-1 and ISO 10414-2. Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards  
SPE

SPE

Definition(s)

SPE

Society of Petroleum Engineers. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
SGS

SGS

Definition(s)

SGS

Static gel strength. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards
SCP

SCP

Definition(s)

SCP

Pressure in an annulus that
  1. rebuilds after having been bled down;
  2. is not caused solely by temperature fluctuations; and
  3. is not a pressure that has been imposed by the well operator
  • Note: 1 to entry: Sustained casing pressure can be present on wells without annular access.
[SOURCE: API RP 90, modified] Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards

SCP

Sustained Casing Pressure. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global Standards  

Sustained casing pressure (SCP)

Sustained casing pressure (SCP) is defined as pressure in any well annulus that is measurable at the wellhead and rebuilds when bled down, not caused solely by temperature fluctuations or imposed by the operator. Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global Standards
Liner Cementing

Liner Cementing

Definition(s)

Liner Cementing

Annular cementing operations for which the top of the casing being cemented is not at the top the wellbore. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Heat-Up Rate

Heat-Up Rate

Definition(s)

Heat-Up Rate (Rh)

Rate of slurry temperature change on going from the surface temperature, TSS, to the predicted bottom-hole circulating temperature, TPBHC. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
ROP

ROP

Definition(s)

ROP

Rate of penetration. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards  
Hesitation-Pumping Squeeze-Cementing Operation

Hesitation-Pumping Squeeze-Cementing Operation

Definition(s)

Hesitation-Pumping Squeeze-Cementing Operation

Squeeze-cementing operation that incorporates discontinuous pumping of the cement slurry. NOTE The slurry is placed into the well, the pumps are stopped for some period of time, then a volume of slurry is again pumped. The process is repeated until a predetermined pressure is reached or the volume of cement slurry has been completely pumped. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Riser

Riser

Definition(s)

Riser

The extension of the wellbore from the subsea BOP stack to the drilling vessel. The riser provides for fluid returns to the drilling vessel, supports the choke, kill, and control lines, guides tools into the well, and serves as a running string for the BOP stack. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  

Riser

Vertical pipe intended to move fluid to either a higher or a lower elevation, such as from the ocean floor to a platform. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Riser

Piping connecting the process facilities or drilling equipment on the floating structure with the subsea facilities or pipelines, or reservoir. NOTE 1 Possible functions include drilling and well intervention, production, injection, subsea systems control and export of produced fluids. NOTE 2 Adapted from ISO 19900:2002, definition 2.29. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

Riser

tubular used for the transport of fluids between the sea floor and a termination point on the platform Note 1 to entry: For a fixed structure, the termination point is usually the topsides. For floating structures, the riser can terminate at other locations of the platform. Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards   

Riser

A subsea flexible hose or rigid pipe leading down from the connection on the unit to a sea bed termination structure. Risers may have a variety of functions including liquid and gas export, water injection, chemical injection and controls, etc. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 3, Functional Unit Types and Special Features, June 2013, Lloyd’s Register, Global Standards
Freeze-Thaw Cycle

Freeze-Thaw Cycle

Definition(s)

Freeze-Thaw Cycle

Test involving a cement sample that is alternately exposed to temperatures above and below the freezing point of water. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Free Fluid

Free Fluid

Definition(s)

Free Fluid

Coloured or colourless liquid which has separated from a cement slurry. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Free Fluid

Coloured or colourless liquid that separates from a cement slurry under static conditions. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards
Fly Ash

Fly Ash

Definition(s)

Fly Ash

Powdered residue from the combustion of coal having pozzolanic properties. NOTE See Clause 17 for further description. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Filtrate

Filtrate

Definition(s)

Filtrate

Liquid that is forced out of a cement slurry during a fluid loss test. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Equivalent Sack

Equivalent Sack

Definition(s)

Equivalent Sack

Mass of the blend of Portland cement and fly ash or pozzolan that has the same absolute volume as 42,63 kg (94 lbs) of Portland cement. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Continuous-Pumping Squeeze-Cementing Operation

Continuous-Pumping Squeeze-Cementing Operation

Definition(s)

Continuous-Pumping Squeeze-Cementing Operation

Squeeze-cementing operation that does not involve cessation of pumping. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Consistometer

Consistometer

Definition(s)

Consistometer

Device used to measure the thickening time of a cement slurry under specified temperature and pressure. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Consistometer

Device used to measure the thickening time of a cement slurry under temperature and under pressure. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Compressive Strength

Compressive Strength

Definition(s)

Compressive Strength

Strength of a set cement sample measured by the force required to crush it. NOTE It is expressed as force per unit area. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Compressive Strength

Force per unit area required to cause a set cement sample to fail under compression. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Compatibility

Compatibility

Definition(s)

Compatibility

Capacity to form a fluid mixture that does not undergo undesirable chemical and/or physical reactions. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  
Clinker

Clinker

Definition(s)

Clinker

Fused materials from the kiln in cement manufacturing that are interground with calcium sulfate to make cement. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Clinker

Fused materials produced in the kiln during cement manufacturing that are interground with calcium sulfate to make cement. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Cement Blend

Cement Blend

Definition(s)

Cement Blend

Mixture of dry cement and other dry materials. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Cement Grade

Cement Grade

Definition(s)

Cement Grade

Designation achieved using the ISO system for denoting the sulfate resistance of a particular cement. NOTE See ISO 10426-1 for further information. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Cement Grade

Designation achieved under the ISO system for denoting the sulfate resistance of a particular cement. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards  
Cement Class (or Cement Type)

Cement Class (or Cement Type)

Definition(s)

Cement Class (or Cement Type)

Designation achieved using the ISO system of classifications of well cement in accordance with its intended use. NOTE See ISO 10426-1 for further information. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards