Abstract In 2017, blowouts and then explosions occurred in a Middle Eastern oilfield. A root cause of the incident is lack study investigation past kicks data. Therefore, as pioneer work region, data gathering analysis were made studied oilfield to learn lessons find gaps. Out 149 drilled wells, total 117 three (3) occurred. this work, list drilling parameters be considered suggested guideline ...

The annular foam breaker is one which uses the vacuum and shear force generated by the Coanda effect to break foam. Its effectiveness in destroying drilling foam has been test in wellbore flow simulation loop experimental stand. Experimental results showed that the operating pressure of the annular foam breaker should be larger than 0.6MPa and the stabilizers concentration of the foam drilling ...

Managing well pressure in petroleum drilling is essential for avoiding instability. An adaptive PID control using the unfalsified procedure is proposed to regulate the pressure. The scheme chooses the right PID parameter from a set of candidate parameters based on the data measurement instead of any hypothetical model. The scheme eliminates the difficulties in tuning the PID even without any pr...

In drilling operation the design of a proper mud weight to avoid any instability’s is important. A low mud weight may cause breakouts around the borehole whereas a high mud weight can fracture the formation. Mud weight design is based on two main factors: the mechanical properties of formations being drilled and the state of in-situ stresses in the field. While drilling in soft formations are t...

Accurate pore pressure prediction is a necessary requirement to well structure optimizing, drilling difficulty minimizing, drilling accidents preventing. It plays a very important role in the economically and efficiently well operating. Previous methods for pore prediction have their own hypothesizes and cannot take into consideration factors that indicate or influence the pore pressure, so the...

Pressure sores are a major problem frequently encountered by persons who use wheelchairs. Custom seat design, including contoured seating and various modular seating devices, has become an important option for pressure relief, especially when the market size is small and the variations of individual needs and requirements are large. An alternative approach in custom seating design for pressure ...

Gas drilling technology is an effective method to protect low permeability tight sandstone reservoirs from damage. However, using this drill high-pressure fractured reservoirs, the fluid flow characteristics are extremely complex, leading safety challenges. Therefore, based on conservation equations of mass, momentum, and energy, a new transient coupled model in matrix-fracture established for ...