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Collaborating Authors
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Mineral (0.95)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.31)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Well Planning > Trajectory design (1.00)
- Well Drilling > Pressure Management > Well control (1.00)
- (7 more...)
- Information Technology > Knowledge Management (0.50)
- Information Technology > Communications > Collaboration (0.40)
When one or more warning signs of kicks are observed, steps should be taken to shut in the well. If there is any doubt that the well is flowing, shut it in and check the pressures. It is important to remember that there is no difference between a small-flow well and a full-flowing well, because both can very quickly turn into a big blowout. In the past, there has been some hesitation to close in a flowing well because of the possibility of sticking the pipe. It can be proven that, for common types ofpipe sticking (e.g., differential pressure, heaving, or sloughing shale), it is better to close in the well quickly, reduce the kick influx, and, thereby, reduce the chances of pipe sticking.
- Well Drilling > Pressure Management > Well control (1.00)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Equipment (1.00)
- (2 more...)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
The time required to drill the well has a significant impact on many items in the cost estimate. Properly estimating the time required is an important part of well planning that must be reflected in the authority for expenditure (AFE). The effect of these items on the overall well cost is dependent on the actual unit cost (i.e., U.S. 15,000/day for a land rig vs. Consider the well in Figure 1. Assume the well will be drilled in east Texas. Table 1 summarizes the projected times for the well in three cases and illustrates the cost differences.
- Well Drilling > Drilling Equipment (1.00)
- Well Drilling > Drill Bits (1.00)
- Well Completion > Completion Installation and Operations (1.00)
- (4 more...)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
The one-circulation method is a well-control procedure. To implement this method certain guidelines must be followed to ensure a safe kick-killing exercise. Although the procedure is relatively simple, its mastery demands basic knowledge of the practical steps taken during the process. A kill sheet is normally used during conventional operations. It contains prerecorded data, formulas for the various calculations, and a graph--or other means--for determining the required pressures on the drillpipe as the kill mud is pumped.
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
It is almost certain that problems will occur while drilling a well, even in very carefully planned wells. For example, in areas in which similar drilling practices are used, hole problems may have been reported where no such problems existed previously because formations are nonhomogeneous. Therefore, two wells near each other may have totally different geological conditions. In well planning, the key to achieving objectives successfully is to design drilling programs on the basis of anticipation of potential hole problems rather than on caution and containment. Drilling problems can be very costly. The most prevalent drilling problems include pipe sticking, lost circulation, hole deviation, pipe failures, borehole instability, mud contamination, formation damage, hole cleaning, H2S-bearing formation and shallow gas, and equipment and personnel-related problems. Understanding and anticipating drilling problems, understanding their causes, and planning solutions are necessary for overall-well-cost control and for successfully reaching the target zone.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Mineral (0.95)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.31)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Well Planning > Trajectory design (1.00)
- Well Drilling > Pressure Management > Well control (1.00)
- (7 more...)
- Information Technology > Knowledge Management (0.50)
- Information Technology > Communications > Collaboration (0.40)