One of a series of devices that continuously monitor the level of the drilling mud in the mud tanks. the indicator usually consists of float devices in the mud tanks that sense the mud level and transmit data to a recording and alarm device (a pit-volume recorder) mounted near the driller’s position on the rig [...]

A device run on wireline into the wellbore and inside the fishing string and fish to locate the area where a fish is stuck. when the drill string is pulled and turned, the electromagnetic fields of free pipe and stuck pipe differ. the free-point indicator is able to distinguish these differences, which are registered on [...]

Trade name for a type of pit-level indicator. see pit-level indicator.

The gauge at the driller’s position that records data from the pit-level indicator.

The level to which fluid rises in a well when the well is shut in.

1.a dial gauge used on the rig to measure the hookload. 2. substances in acid-base that, in solution, change color or become colorless as the hydrogen ion concentration reaches a definite value, these values varying with the indicator. in other titrations, such as chloride, hardness, and other determinations, these substances change color at the end [...]

An instrument with a graduated stem, used to determine the gravity of liquids. the liquid to be measured is placed in a cylinder, and the hydrometer dropped into it. it floats at a certain level in the liquid (high if the liquid is light, low if it is heavy), and the stem markings indicate the [...]

A pressure-sensing element consisting of a twisted or curved rube of non-circular cross section, which tends to straighten when pressure is applied internally. by the movements of an indicator over a circular scale, a bourdon tube indicates the pressure applied.

To pump a quantity of heavy mud into the drill pipe. before hoisting drill pipe, it is desirable (if possible) to pump into its top section a quantity of heavy mud (a slug) that causes the level of the fluid to remain below the rig floor so that the crew members and the rig floor [...]

A common term for a rig weight indicator. martin-decker is the name of a company.

Distance between well head and point to which fluid rises in the well.

Abbr. deep laterlog / liquid level detection / log linear detrending

The depth of a well or features within the wellbore as measured while drilling. the measured length of each joint of drillpipe or tubing is added to provide a total depth or measurement to the point of interest. drillers depth is the first depth measurement of a wellbore and is taken from the rotary table level on [...]

The point in a well from which depth is measured. alternatively, the depth reference is the point at which the depth is defined as being zero. it is typically the top of the kelly bushing or the level of the rig floor on the rig used to drill the well. the depth measured from that point [...]

An instrument near the driller’s position on a drilling rig that shows both the weight of the drill stem that is hanging from the hook (hook load)