Onshore or land base drilling is defined as drilling with rigs that are moved in by ground transportation and the drilling site is not over water. Many of these wells are now being drilled using a technique called pad drilling where multiple wells are drilled from the same site in very close proximity of each other by shifting the rig slightly. Typically, these are mature fields, pushing the drilling envelope farther to more challenging well formations like new shale fields or very deep wells.
Onshore drilling has many different challenges related to industry economics, equipment used, location of the field, well profile and formations.
Rig day rates make running a rig expensive, which means that the speed of rigging down, moving and rigging up is crucial to guarantee project success. Drilling equipment has to be reliable and easy to handle on the rig floor.
The physical location of the well site sets limits on the size and type of drilling equipment and sometimes the drill string. Well sites in Arctic areas, for example, have surface equipment and downhole equipment that are exposed to extreme surface temperatures for long periods before use, which can impact their performance.
Well profiles and formations determine drill string requirements:
– H2S wells require use of special steels to resist Sulfide Stress Cracking. – ERD or deep wells require the drill pipe in the upper part of the string to have high tensile strength. – Extended reach wells and ultra-extended reach wells can be difficult to drill because they may be limited by the increased torque and drag of the drill string. – Small clearance wells will drive Equivalent Circulating Density (ECD) higher, put additional stress on formations and increase circulation pressures.
Products & Solutions
COMMAND-SMFI offers custom drill strings to meet onshore challenges head-on:
High performance proprietary connections that can be matched with ODs and IDs to provide optimized torque, tensile and hydraulic impact for the particular program.