| M1 |
the
methyl orange alkalinity of the filtrate, reported as the number of millimeters of 0.02
normal (n/50) acid required pr millimeter of filtrate to reach the methyl orange end point
(pH 4.3). |
| macaroni rig |
a
workover rig, usually lightweight, that is specially built to run a string of 3/4 inch or
1-inch tubing. See macaroni string. |
| macaroni string |
a
string of tubing or pipe, usually 3/4 or 1 inch in diameter. |
| magnet |
a
metal that has the property of attracting ferrous and certain other metals to it. |
| magnetic survey |
an
exploration method in which an instrument that measure the intensity of the natural
magnetic forces existing in the earth's subsurface is passed over the surface or through
the water. The instrument can detect deviations in magnetic forces, and such
deviations may indicate the existence of an underground hydrocarbon reservoir. |
| magnetometer |
an
instrument used to measure the intensity and direction of a magnetic field, especially
that of the earth. |
| make a connection |
to
attach a joint of drill pipe onto the drill stem suspended in the wellbore to permit
deepening the wellbore by the length of the joint added (about 30 feet, or 9 meters). |
| make a hand |
to
become a good worker. |
| make a trip |
to
hoist the drill stem out of the wellbore to perform one of a number of operations such as
changing bits, taking a core, and so forth, and then to return the drill stem to the
wellbore. |
| make it up another wrinkle |
to
make up connection one more turn. |
| make up |
1. to
assemble and join parts to form a complete unit (e.g., to make up a string of casing).
2. to screw together two threaded pieces. 3. to mix or prepare (e.g., to make
up a tank of mud). 4. to compensate for (e.g., to make up for lost time). |
| makeup |
added
to a system (e.g., makeup water used in mixing mud). |
| make up a joint |
to
screw a length of pipe into another length of pipe. |
| makeup cathead |
a
device that is attached to the shaft of the drawworks and used as a power source for
screwing together joints of pipe. It is usually located on the driller's side of the
drawworks. Also called spinning cathead. See cathead. |
| make hole |
to
run casing or pipe. |
| male connection |
a
connection with the threads on the outside. |
| mandrel |
a
cylindrical bar, spindle, or shaft around which other parts are arranged or attached or
that fits inside a cylinder or tube. |
| manhole |
a
hole in the side of a tank through which a man can enter the tank, also the cleanout
plate. |
| manifold |
1. an
accessory system of piping to a main piping system (or another conductor) that serves to
divide a flow into several parts, to combine several flows into one, or to reroute a flow
to any one of several possible destinations. 2. a pipe fitting with several side
outlets to connect it with other pipes. 3. a fitting on an internal combustion
engine made to receive exhaust gases from several cylinders. |
| marginal well |
an
oil or gas well the production of which is so limited in relation to production costs that
profit approaches the vanishing point. |
| marine riser pipe |
see
riser pipe. |
| Marsh funnel |
a
calibrated funnel used in field tests to determine the viscosity of drilling mud. |
| Marsh funnel viscosity |
commonly
called the funnel viscosity. The Marsh funnel viscosity is reported as the number of
seconds required for a given fluid to flow 1 qt through the Marsh funnel. In some
areas, the efflux quantity is 1,000 cc. See API-RP13B for instructions. See also
kinematic viscosity. |
| Martin-Decker |
a
common term for a rig weight indicator. Martin-Decker is the name of a company. |
| mast |
a
portable derrick that is capable of being erected as a unit, as distinguished from a
standard derrick that cannot be raised to a working position as a unit. For
transporting by land, the mast can be divided into two or more sections to avoid excessive
length extending from truck beds on the highway. Compare derrick. |
| master bushing |
a
device that fits into the rotary table to accommodate the slips and drive the kelly
bushing so that the rotating motion of the rotary table can be transmitted to
the kelly. Also called rotary bushing. |
| master choke line valve |
the
valve on the choke and flow line that is nearest to the preventer assembly. Its
purpose is to stop the flow through the choke and flow line. |
| master gate |
a
large valve used to shut in a well. |
| master or primary
control panel |
a
manifold system of valves, usually situated at the power source, which may be operated
manually (or by remote control) to direct pressurized fluid to closing devices at
wellhead. |
| master valve |
1. a
large valve located on the Christmas tree and used to control the flow of oil and gas from
a well. Also called master gate. 2. the blind or blank rams of a blowout
preventer (obsolete). |
| matrix acidizing |
the
procedure by which acid flow is confined to the natural permeability and porosity of the
formation. Compare fracture
acidizing. |
| Mcf |
abbreviation:
1,000 cubic feet of gas, commonly used to express the volume of gas produced, transmitted,
or consumed in a given period. |
| Mcf/d |
abbreviation:
1,000 cubic feet of gas per day. |
| measure in |
to
obtain an accurate measurement of the depth reached in a well by measuring the drill pipe
or tubing as it is run into the well. |
| measure out |
to
measure drill pipe or tubing as it is pulled out of the hole, usually to determine the
depth of the well or the depth to which the pipe or tubing was run. |
| mechanical jar |
a
percussion tool operated mechanically to give an upward thrust to a fish by the sudden
release of a tripping device inside the tool. if the fish can e freed by an upward
blow, the mechanical jar can be very effective. Also called a hydraulic jar. |
| mechanical rig |
a
drilling rig in which the source of power is one or more internal-combustion engines and
in which the power is distributed to rig components through mechanical devices (such as
chains, sprockets, clutches, and shafts). Also called a power rig. |
| meniscus |
the
curved upper surface of a liquid column, concave when the containing walls are wet by the
liquid (negative meniscus) and convex when not (positive meniscus). |
| mesh |
a
measure of fineness of a woven material, screen, or sieve; e.g., a 200-mesh sieve has 200
openings per linear inch. A 200-mesh screen with a wire diameter of 0.0021 in.
(0.0533 mm) has an opening of 0.074 mm, or will pass a particle of 74 microns. See micron. |
| metamorphic rock |
a
rock derived from preexisting rocks by mineralogical, chemical, and structural alterations
caused by processes within the earth's crust. Marble is a metamorphic rock. |
| methane |
a
light, gaseous, flammable paraffinic hydrocarbon that has a boiling point of -25 degrees F
and is the chief component of natural gas and an important basic hydrocarbon for
petrochemical manufacture. |
| MFE |
abbreviation:
a trademark name for multiple formation evaluation; a DST. |
