Podcast
Questions and Answers
What is the primary responsibility of the drilling engineer?
What is the primary responsibility of the drilling engineer?
- To supervise rig operation
- To design the well plan
- To manage the drilling crew
- To modify the well plan as drilling progresses (correct)
What does the term 'tool joints' refer to in drilling?
What does the term 'tool joints' refer to in drilling?
- The connection points of the drill string (correct)
- The sections of the drill pipe that are welded
- The surface equipment for extraction
- The specialized equipment used in drilling
Which welding method replaced flash welding for attaching tool joints?
Which welding method replaced flash welding for attaching tool joints?
- Arc welding
- Spot welding
- Inertia and friction welding (correct)
- Laser welding
What is the purpose of API specifications in drilling?
What is the purpose of API specifications in drilling?
What is the minimum yield strength of Grade E drill pipe?
What is the minimum yield strength of Grade E drill pipe?
What ensures the weld strength in drill pipe according to ASI/ISO specifications?
What ensures the weld strength in drill pipe according to ASI/ISO specifications?
Who is responsible for making on-site decisions regarding drilling operations?
Who is responsible for making on-site decisions regarding drilling operations?
What is one of the key aspects of drill string design as per API specifications?
What is one of the key aspects of drill string design as per API specifications?
What type of well is classified as a wildcat well?
What type of well is classified as a wildcat well?
Which type of oil company primarily invests in shallow, less-expensive wells drilled on land?
Which type of oil company primarily invests in shallow, less-expensive wells drilled on land?
What must be included in the bid specifications and drilling contract?
What must be included in the bid specifications and drilling contract?
What is the primary purpose of a development well?
What is the primary purpose of a development well?
Which type of wells require significant investment and are usually drilled offshore or outside the U.S.?
Which type of wells require significant investment and are usually drilled offshore or outside the U.S.?
What is the weight of Standard Weight drill pipe tubes?
What is the weight of Standard Weight drill pipe tubes?
What is the range for LENGTH RANGE 1 of drill pipe tubes?
What is the range for LENGTH RANGE 1 of drill pipe tubes?
Which grade of drill pipe tubes is heavier than Standard Weight?
Which grade of drill pipe tubes is heavier than Standard Weight?
Which numeric code corresponds to Heavier than Standard tubes?
Which numeric code corresponds to Heavier than Standard tubes?
What does the asterisk next to a grade indicate?
What does the asterisk next to a grade indicate?
Where should the GRADE CODE and WEIGHT CODE be stenciled on the drill pipe?
Where should the GRADE CODE and WEIGHT CODE be stenciled on the drill pipe?
What yield strength must drill pipe tubes exceed to be considered high strength?
What yield strength must drill pipe tubes exceed to be considered high strength?
What action should be taken if evidence of fatigue damage is noted on drill pipe tubes?
What action should be taken if evidence of fatigue damage is noted on drill pipe tubes?
What is the primary focus of drilling engineering?
What is the primary focus of drilling engineering?
Which group is responsible for securing legal rights and access for drilling operations?
Which group is responsible for securing legal rights and access for drilling operations?
What determines important parameters such as mud rheology and weight on bit in drilling engineering?
What determines important parameters such as mud rheology and weight on bit in drilling engineering?
Who primarily invests in drilling for oil and gas?
Who primarily invests in drilling for oil and gas?
What is the role of drilling contractors in the drilling process?
What is the role of drilling contractors in the drilling process?
What is the purpose of computations in drilling engineering?
What is the purpose of computations in drilling engineering?
What determines the location for wildcat wells?
What determines the location for wildcat wells?
Which group is responsible for establishing and striking the well location?
Which group is responsible for establishing and striking the well location?
What is the main purpose of drilling water wells in the context of drilling operations?
What is the main purpose of drilling water wells in the context of drilling operations?
In which situation is a contract price per day typically implemented?
In which situation is a contract price per day typically implemented?
What does the term 'drill stem' refer to in drilling engineering?
What does the term 'drill stem' refer to in drilling engineering?
Which factor might influence the decision to drill to a certain depth or formation?
Which factor might influence the decision to drill to a certain depth or formation?
What challenges are associated with estimating costs for drilling beyond a certain point?
What challenges are associated with estimating costs for drilling beyond a certain point?
Study Notes
Drilling Engineering
- A branch of petroleum engineering
- Drilling different types of wells to access the reservoir
- Uses various techniques
- Formulas used in drilling engineering include:
- Mud rheology
- Mud weight
- Weight on bit
- Pump rate
- Characteristics of rock and drilling fluids
- Functions of the Drill String
- Drill pipe with tool joints attached
- The IADC (International Association of Drilling Contractors) defines the drill string
API Specifications and Recommended Practices
- Cover a wide range of oilfield equipment
- Include tubular goods
- API 5DP, RP7G AND RP7A1
- These publications relate to the connections for drill string and design/operating limits of drill stem
Drill Pipe Grades
- Current Grades
- E-75 - Minimum yield 75,000psi
- X-95 - Minimum yield 95,000psi
- G-105 - Minimum yield 105,000psi
- S-135 - Minimum yield 135,000psi
- Z-140 - Minimum yield 140,000psi
- V-150 - Minimum yield 150,000psi
- U-165 - Minimum yield 165,000psi
- High Strength
- All grades above E-75
- Grades with Asterisk
- Grades marked with asterisk have been used, but not been formally recognized
- Normal Tolerance on yield strength of drill pipe tubes
- Plus 30,000 psi
Sizes of Drill Pipe Tubes
- Light Weight
- Standard Weight
- Heavier than Standard Weight
Grade Code and Weight Code
- Should be stenciled on the pin base for finished drill string assemblies
- Recommended that these two codes also be stenciled on a milled flat on the pin long surface for quick identification
API Length Ranges
- Range 1 - 18-22 FT
- Range 2 - 27-30 FT
- Range 3 - 38-45 FT
Numeric Codes
- 1 - Light-Weight Tube
- 2 - Standard Weight Tube
- 3 - Heavier than Standard Tubes
Drill Pipe Identification
- Marked at the base of the pin by the tool joint manufacturer after the pin is affixed
Magnetic Particle Inspection
- In highly stressed drilling environments, or if fatigue damage is noted
- Recommendations:
- Conduct a magnetic particle inspection
Inertia and Friction
- Attaching of tool joints to upset drill pipe tubes by flash welding replaced by inertia and friction welding in the 1970s
- ASI/ISO Specifications
- Require the weld to be stronger than the tube body
- Have good ductility
- Not be harder than 37 Rockwell C.
Well Types
- Wildcat well:
- Purpose is to discover a new petroleum reservoir
- Development well:
- Purpose is to exploit a known reservoir
Water Wells
- May have to be drilled to supply the requirements for drilling operations
Drill Stem
- All members between the swivel and the drill bit
Overview of Drilling Operations
- Oil Companies
- Make the large investments to drill for oil and gas
- Small Oil Companies
- Invest mostly in shallow, less-expensive wells drilled on land in the United States
- Large Oil Companies
- Investments in expensive offshore and non-U.S. wells
- Well
- Classified as a wildcat if its purpose is to discover a new petroleum reservoir
- Classified as a development well if its purpose is to exploit a known reservoir
- Reservoir
- In contrast, the purpose of a development well is to exploit a known reservoir
Drilling Contractor
- Carries out the drilling operations
- Once the management decision is made to drill
Drilling Engineering Group
- Prepares a more detailed well design
- Writes the bid specifications
Bid Specifications and Drilling Contract
- Include the equipment and procedures that the operator will require
- Must include a well description
Bid Basis
- Cost per Foot
- In areas where previous experience has shown drilling to be routine
- Based on a certain depth or formation
- Contract Price per Day
- In areas where costs cannot be estimated with reasonable certainty
- Applies beyond a certain point
Management
- Responsible for making the decision to drill
- Responsible for making the on-site decisions concerning drilling operations and other services needed
- Tool pusher is responsible for the rig operation and rig personnel supervision
Geological Groups
- Responsible for the well location
Reservoir Engineering Groups
- Responsible for the preliminary well designs and cost estimates for the proposed well
Legal Group
- Secures the necessary drilling and production rights
- Establishes clear title and right-of-way for access
Surveyors
- Establish and stake the well location
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Description
Explore the essentials of drilling engineering, including types of wells, drilling techniques, and important formulas used in the field. Understand the functions of the drill string and familiarize yourself with API specifications and current drill pipe grades. This quiz is a great resource for students and professionals in petroleum engineering.
