Drilling slips exert hoop compression on the Drill Pipe which can deform the pipe in unfavorable conditions. This article will teach the drill pipe slip crushing formula and calculations. Slip Crushing Constant A unit tensile stress St from hanging weight will result in a hoop stress Sh that is a function of many factors such as slip length, …
In general, we can define the burst pressure in a drill pipe as the differential pressure acting across the drill pipe wall due to an internal pressure greater than the external pressure. In this article, we shall discuss the drill pipe burst pressure formula and calculations used in drill string design. How To Consider Burst …
Hydrostatic pressure in oilfield drilling is the pressure that a fluid exerts due to the weight of the fluid column above it. This pressure varies with the depth and density of the fluid. It’s present at all points below the fluid surface, regardless of whether the fluid is a liquid or a gas. For instance, …
We define annular pressure loss or APL as the pressure lost while circulating drilling mud in the annulus. This loss is mainly due to frictional forces between the mud, borehole wall, and drill string. What Is The Pressure Loss? Pressure is required to circulate mud around a wellbore. This pressure is necessary to overcome the …
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., …
Before approving a drilling program, the drilling team must perform estimation for the overall costs of the oil well drilling operations. Suppose there is no previous drilling data in a new area. In that case, the drilling team can only approximate the well cost roughly. In most cases, the drilling team can use available well …
The service life of drill lines is greatly improved by drawing up a cut and slip program based on service increments. The main requirement for any program is to have an excess of drill line above that required for string-up. This excess can be slipped through the system at such a rate that wear is …
D is an exponent which, relating drilling penetration rate to weight on bit per unit hole diameter, measures the formation’s ” drillability “. There were several attempts to link the drilling parameters to generate a measure of drillability. The best known was by Jorden and Shirley *, who demonstrated empirically that in homogeneous shale formations, …
We will know from experience that the most challenging physical job on a drilling rig (also check: rig components) is when we are tripping pipe in and out of the hole. We will also know that we count the pipe in and we count the pipe out. The reason for counting the pipe is so …
The drilling program is the engineering design for the process of drilling and completion of the wellbore. The plan includes many data including well trajectory, casing design, mud program, well control, Drilling Bit Selection, geological data, formation gradient estimations, economics, and special procedures that shall be followed during the construction of the well. Although drilling …