The oil–gas conductor is the key part that connects subsea facilities and offshore equipment. The installation, construction and the stability control in subsequent operation of the conductor are main technical problems in the field of offshore oil and gas engineering. The book focuses on installation of oil and gas conductor in the offshore oil field. It includes three parts. The first part introduces the main installations and structural features of the wellhead above water and the wellhead under water. Then, it summarizes methods and theories of oil and gas conductor design. Finally, the differences in the construction techniques and supporting equipment of the three oil and gas well conductor installation methods are systematically described.
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Contents 1 Functions of the Oil-Gas Well Conductor and Wellhead Structure 1 1.1 Functions of Oil-Gas Well Conductor 2 1.1.1 Functions of Exploration Well Conductor 2 1.1.2 Functions of Development Well Conductor 3 1.2 Oil-Gas Wellhead Structure 3 1.2.1 Conductor Structure of the Wellhead Above the Sea 3 1.2.2 Conductor Structure of Subsea Wellhead 10 1.3 Common Oil-Gas Wellhead Equipment 14 1.3.1 Technical Requirements of Wellhead Equipment 14 1.3.2 Common Wellhead Equipment 21 References 27 2 Drilling-In Installation of Oil-Gas Well Conductor 29 2.1 Drilling-In Installation of Conductor 29 2.1.1 Drilling-In Construction Method of Conductor 29 2.1.2 Conductor Construction Method for Wellhead Above the Sea 29 2.1.3 Precautions for Construction 37 2.2 Main Equipment 37 2.2.1 Driving System 37 2.2.2 Rotating System 38 2.2.3 Hoisting System 41 2.2.4 Wellhead and Downhole Tools 42 2.3 Suitable Conductor Setting Depth Design 42 2.3.1 Load Analysis of Oil-Gas Well Conductor 42 2.3.2 Calculation Models of Conductor Bottom Ultimate Bearing Capacity 45 2.3.3 Calculation Models of Conductor’s Lateral Friction of Oil-Gas Well Conductor 53 2.3.4 Calculation of Suitable Conductor Setting Depth 56 2.4 Application Case Analysis 58 2.4.1 Oil Field Base Information 58 2.4.2 Suitable Depth Below Mud Line Design of Oil-Gas Well Conductor 62 2.4.3 Check Analysis of Conductor Stability 63 References 65 3 Piling Installation of Oil-Gas Well Conductor 67 3.1 Piling Installation Technology of Conductor 67 3.1.1 Piling Construction Technology 67 3.1.2 Precautions for Construction 73 3.2 Main Equipments 74 3.2.1 Piling Equipments 74 3.2.2 Lifting Equipment 79 3.2.3 Conductor Shoe 80 3.3 Reasonable Setting Depth Design 81 3.3.1 Load Analysis of Oil-Gas Well Conductor 81 3.3.2 Calculation of Conductor Bottom Ultimate Bearing Capacity 82 3.3.3 Calculation of Pile Driving Resistance 83 3.3.4 Calculation of Conductor Setting Depth 83 3.3.5 Calculation of Penetration Length 84 3.3.6 Calculation Model of Hammering Number 90 3.4 Application Case Study 90 3.4.1 Basic Information of Oil Field 90 3.4.2 Design of Depth of Conductor into Mud 93 3.4.3 Check and Analysis of Conductor Stability 96 3.4.4 Selection of Pile Hammer 100 References 105 4 Jetting Installation Method of Oil-Gas Well Conductor 107 4.1 Jetting Installation Method of Conductor 107 4.1.1 Jetting Construction Method 107 4.1.2 Precautions for Jetting Installation 113 4.2 Main Equipment 114 4.2.1 Driving System and Drill String 114 4.2.2 CADA Tool 114 4.3 Design of the Setting Depth of Conductor 116 4.3.1 Load Analysis of the Conductor 116 4.3.2 Calculation of Bearing Capacity of Conductor 119 4.3.3 Calculation Method of the Setting Depth of Conductor 124 4.4 Optimal Design of Jetting Installation of Conductor 124 4.4.1 Optimal Design of Jetting Drilling Pressure 125 4.4.2 Design of Jetting Displacement 135 4.4.3 Design of Bit Protrusion 144 4.4.4 Determination of Release Waiting Time-Window 149 4.5 Application Case Analysis 152 4.5.1 The Ultimate and Real-Time Bearing Capacity of Conductor 152 4.5.2 Safe Depth of Conductor into Mud in Jetting InstallationMethod 155 4.5.3 Safe Waiting Time of Surface Conductor 159 References 162 5 Adaptability of Installation Method of Offshore Conductors 163 5.1 Technical Adaptability of Drilling-In Installation Method of Conductor 164 5.2 Technical Adaptability of Piling Installation Method of Conductor 165 5.3 Technical Adaptability of Jetting-Down Installation Method of Conductor 166
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