A pipe sticking mechanism is something that is happening in the hole, which causes the force required to pull string to be greater than the weight plus the expected friction. In addition, the supporting force while running in will be less than the weight minus the expected friction. Sticking mechanisms can act while raising the …
In case of a drill string failure, such as pipe washout or twist-off, it is crucial to determine the cause of the failure to prevent it from happening again. This text covers the most common failure mechanisms, of which there are over a dozen, and provides a general understanding of what to do in each …
Hard formation drilling presents significant challenges to Polycrystalline Diamond Compact PDC bits. The major cause of reduced ROP and bit life has been identified as lateral downhole drill string vibration or ‘bit whirl’. The phenomenon manifests itself in the form of high irregular torques and poor rates of penetration. The negative impact of vibrations on …
The length of the annulus or the length of the low-density fluid and mud density of the lost circulation can be calculated based on the annulus capacity behind the drill collar. Suppose the lost circulation volume is smaller than the annulus volume against the drill pipe. In that case, the length of the annulus (i.e., …
Drilling oil and gas wells can sometimes encounter a common issue called the drill pipe twist off. This problem can have a direct impact on the overall well cost and duration of the drilling process. In this article, we will explore the primary causes of this problem and discuss ways to prevent it. What Is …
During drilling and workover operations, the consequences of leaks with sour gas or crude may be devastating. Drilling H2S-bearing formations poses one of the most challenging and dangerous problems to humans and equipment. Personnel can be injured or even killed by relatively low concentrations of H2S in a very short period. Equipment can experience terrible …
In general, differential sticking is a situation that may happen during any stage of drilling the well and cause the drill string or casing pipe to be stuck (no upward or downward movement). It actually happens when the hydrostatic pressure, ph (which acts on the outside wall of the Pipe), is more than the pore …
Drill string vibrations can significantly impact the performance of oil and gas drilling operations. They can lead to premature wear and tear of drilling equipment, resulting in fatigue and induced string failures such as drill pipe washout. Additionally, they decrease the drilling energy delivered to the bit. Therefore, it will cause a drop in the …
Oil & gas blind drilling is the process of drilling at the minimum possible pump rate to conserve drilling fluid stocks while the annulus is topped up with water. If returns begin while drilling, this might indicate that the circulation loss zone has been plugged with drilled cuttings. However, it could also indicate the onset …
Pipe Washout in oil and gas is a sudden problem that may happen during any stage of drilling the well and may cause a parting of the string and the following fishing in drilling operations that will increase well time and cost. Drill Pipe Washouts Causes & Precautions As with all downhole problems, prevention is …