Available data from offset wells, even vertical wells should be collected. The first step in planning a horizontal wellbore is to gather all the information possible about the well and the formation to be drilled. Horizontal Directional Drilling Planning Calculations Steps Gathering Data Packers Design Selection Steps In Oil & Gas.Types of Packers In Oil & Gas Completion.Top 7 Directional Drilling Companies Worldwide.Consequently, they are a little harder to hit and greater care must be exercised in drilling a horizontal wellbore. As you can see, target tolerances for horizontal wellbores are much smaller than typical directional oil / gas wells. The wellbore must stay within a three foot vertical zone.
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There have been some horizontal wells drilled with a TVD target tolerance of plus or minus 1.5 feet. The placement of a horizontal well in this formation will require the wellbore to be horizontal at a TVD of 4,010 feet, plus or minus ten feet. If the horizontal well also has a tight departure target, it is more difficult to drill.įor example, a formation top may be at a true vertical depth of 4,000 feet and the formation is 20 feet thick. The departure target is usually more flexible than the TVD target.
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In a horizontal well, the target is most commonly described by the TVD plus or minus a tolerance. The target has tolerances in the horizontal plane (North and East). In a normal directional wellbore, the target is usually described in terms of a departure at a certain TVD. Planning & calculation of a horizontal wellbore is different from planning a normal directional drilling well for oil and gas.