Our Calculators

Calculate internal, external and annular cross-sectional areas for any tubular combination — the basis for capacity, velocity and force work.

Calculate internal capacity and annular volume for tubing and casing strings — displacement volumes for cementing, fluid changes and circulating.

String weight in air and buoyed in any completion or drilling fluid — trustworthy hook load and hanger load before you pick up the string.

Determine the force or pressure differential needed to shear setting pins and release rings, with a safety margin check against rated shear values.

Calculate circulating pressure, rate and differential force across a set packer — circulate or reverse out without unseating or over-pressuring it.

Calculate elastic pipe stretch under tension, self-weight and temperature — overpull to space out tools, set a packer or find a stuck-pipe free point.

Convert mud weight to pressure gradient and hydrostatic pressure at any depth — ppg, lb/ft³, specific gravity or API gravity, plus solve-for-density.

Fluid velocity through a pipe or annulus, from flow rate — or solve for the rate needed to hit a target velocity, with a hole-cleaning reference range.

Cement volume, balanced length, spacer volumes, and displacement volume for a balanced cement plug — solve for plug length from a known cement volume too.

Static formation temperature at any depth, from surface temperature and a geothermal gradient — or solve for the gradient from a measured temperature.

Surge and swab pressure from pipe trip speed, hole/pipe geometry, and mud rheology — or solve for the maximum safe trip speed.

Duplex pump flow rate and time to pump a target volume, from liner size, stroke length, and pump speed — or solve for the required rate.

Maximum additional overpull above a current axial load, from pipe OD, ID, and steel grade — or solve for the resulting design factor at a target tension.

Running cumulative depth from a joint-length tally, plus a starting offset — or solve for the pup-joint length needed to land on target.

Length and force changes of a tubing string sealed in a packer, from pressure and temperature — every effect shown with its method, then summed.

Tubing stress design factors for burst, collapse and tension against API ratings along the whole string, with the governing constraint called out.

Screen a casing string against several design load cases at once — burst, collapse and tension at every depth, with the governing case called out.

Draw a wellbore elevation from your casing strings and equipment — drag depths or type them, with a legend and consistency checks included.