2D8UR

2D8UR stands for Directional Drilling Underbalanced Rotary. This technique has a wide range of practical applications and is especially useful in oil and gas drilling operations. In this article, we will discuss the application field and working principle of 2D8UR.

Application Field

The 2D8UR technique is used primarily for exploratory drilling operations, as well as drilling development wells. It can also be used for well repair, remediation, and other related activities. This technique has been successfully applied to over 13,000 wells worldwide, making it an increasingly popular option among oil and gas operators.

Due to its versatility, the 2D8UR technique can be used to drill in almost any kind of material: from soft limestone formations to hard granite reservoirs. This makes it ideal for exploratory operations, since it can be used to assess different geological formations without having to switch drilling techniques.

Furthermore, 2D8UR drilling has low requirements in regards to mud pressure and mud chemistry, making it ideal for drilling in challenging environments. This is also beneficial for wells with a high risk of kicks, as the low mud pressure and mud chemistry help reduce the risk of subsurface fluid influx.

Working Principle

The working principle of the 2D8UR technique is based on the idea of “underbalanced” drilling. This means that the mud pressure during drilling is set at a level below the pressure of the formation being drilled. This reduces the risk of formation damage and helps ensure that a smooth borehole is created.

The process of 2D8UR drilling begins with circulation of drilling mud down the drill pipe. The mud is circulated up the annular space outside the drill pipe, creating a mud cushion between the drill bit and the formation. This cushion helps to reduce friction and drag, which improves the rate of penetration.

At the deeper depths of the well, the pressure of the formation exceeds the mud pressure. When this happens, two-phase flow (gas and liquid) is created. This two-phase flow reduces the drag on the drill bit and helps keep the well borehole wall clean. This allows the 2D8UR drilling technique to create smooth boreholes in even the most challenging formations.

In addition to its underbalanced drilling capability, the 2D8UR technique also has the ability to drill directional wells. This is done by controlling the direction of the torque and drag applied to the drill bit. This allows the operator to choose the direction in which the wellbore should be drilled. This feature can also be used to access challenging reserves that may not otherwise be accessible.

Conclusion

In conclusion, the 2D8UR technique is a versatile and cost-effective method for exploratory drilling, well repair, and other related activities. The technique combines underbalanced drilling with directional well drilling, making it well-suited for challenging formations. The low requirements for mud pressure and mud chemistry also make it suitable for drilling in high-risk environments. Finally, the directional drilling capability of the technique can be used to access challenging reserves that may not otherwise be accessible.