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| Some Jobs on the rig | ||||||||||||||||||||||||
| Personal | ||||||||||||||||||||||||
| Home | Pictures | |||||||||||||||||||||||
| After the oil company has hired a rig, complete with crew, other companies are hired to do specialized jobs. These companies are called "third party" or "Service" companies. | ||||||||||||||||||||||||
| My Job Mud Logger | ||||||||||||||||||||||||
| Cementers. After an exploration hole is drilled, it is usually plugged with cement. To do this cement is pumped down the hole and allowed sot set. At various times during drilling, steel pipe or casing in run into the hole to keep the hole from caving in. This casing must be cemented in place. At any while drilling there is danger that a blow out could occur. A cementer is always present on the rig so that the hole can be safely plugged with cement if this happens. This cement is not normal cement It is made to specialized recipe to control hardness and the time is takes to harden. | ||||||||||||||||||||||||
| Casing Hands. At various times, steel pipe or casing is run into the hole to maintain the integrity of the hole. The casing is very large pipe, larger than the drill crew is used to working with. Special equipment is used to run the pipe into the hole. For example, the torque that is applied to a section of pipe when it is screwed onto the next is measured and recorded. | ||||||||||||||||||||||||
| MWD means Measurement While Drilling. Inside a section of large pipe, not far from the bit, various measuring tools are placed. One type of tool measures the angle of the hole and the direction to hole is going. Other tools measure the gamma rays emited from the rock, the electrical resistivity of the rock and the acoustical (sound) properties of the rock. The MWD tool takes these reading and sends the information to the surface in coded pressure pulses in the mud coming out of the hole These coded pressure pulses are like tiny waves in the moving mud The code is like binary computer language. Theses pressure pulses are read and decoded by pressure sensors and computers on the surface. This information is used to tell the type of rock is being drilled and whether oil, gas or water is present. These measurements are taken while the rig is drilling | ||||||||||||||||||||||||
| Mud Engineer. Mud is pumped down the inside of the drillpipe, out through the bit and then back up the hole on the outside of the drillpipe. The primary purpose of the mud is to hold back the pressure of the rock formation. The deeper a hole is drilled the higher the pressure will be. The density (weight of each gallon) is controlled so that the total weight of the mud in the hole will hold back the pressure of the rock formation. As the mud travels up the hole it also carries the tiny pieces of drilled rock and cleans these fragments out of the hole. This mud also cools the bit and actually helps the bit drill by applying hydraulic pressure, much like a pressure sprayer. Mud is very expensive and it properties are very strictly controlled. The real name for mud is drilling fluid. It is the mud engineers job to keep a close control on the properties the drilling fluid, so that it will perform all the task required. | ||||||||||||||||||||||||
| Wire Electric Logs. After a section of hole is drilled, it is usually logged. Various tools, some with the same purpose as MWD tools, are lowered into hole on a wire. These measuring devices can give a very accurate recording of the type of rock, many of rocks properties, the pressure of the formation and the type of fluid in the pores of the rock, either water gas or oil. | ||||||||||||||||||||||||
| Directional Driller. Holes are not just drilled vertically. Many times a specific drilling path is planned, (angle and direction). This path is planned out and plotted out by the directional driller in order to reach a specific target. This target is usually a gas or oil pocket. Many wells today are drilled to a certain depth and then turned to follow a horizontal path. The DD tries to make the hole follow the planned path. This is achieved by putting a small bend (1 to 5 deg) in the pipe behind the bit to make the hole go off in a slightly different direction. The actual direction the hole follows is plotted out from the readings from the MWD tool. The directional driller uses these readings, and the pipe bend to try and steer the hole in the planned direction. | ||||||||||||||||||||||||
| Fisherman. Sometimes things go wrong. Sometimes the bit can get stuck, but the rig is still drilling and the pipe gets twisted off. Sometimes things fall down the hole. Sometimes the pipe gets stuck in the hole and the driller has to unscrew the pipe where it is not stuck. Whenever this happens, stuff is left in the hole and this stuff is called junk. The fisherman had various tool to get this junk out of the hole | ||||||||||||||||||||||||