What does gel strength depend on?
These forces depend on (1) surface properties of the mud solids, (2) volume concentrations of the solids and (3) electrical environment of the solids.
How do you define 10 mins gel strength?
What Does 10-Minute Gel Mean? 10 minute gel strength indicates the maximum dial deflection as per API, after the mud has remained static for 10 minutes, and is the shear stress measured at low shear rate after the mud is allowed to set for 10 minutes.
What is the unit of gel strength?
lbf/100ft2
Gel strengths are measured in units of lbf/100ft2, and the test values are termed the 10-second, 10-minute, and 30-minute gel strengths. Gel strength typically falls under two categories: progressive and flat.
What is gel strength in drilling fluid?
1. n. [Drilling Fluids] The gel strength is the shear stress measured at low shear rate after a mud has set quiescently for a period of time (10 seconds and 10 minutes in the standard API procedure, although measurements after 30 minutes or 16 hours may also be made).
What is mud gel strength?
The gel strength is the shear stress of drilling mud that is measured at a low shear rate after the drilling mud has been static for a certain period of time.
What is the difference between gel strength and yield point?
Difference between Gel Strength. Gel strength measurements denote the thixotropic properties of the mud. They are a measure of the attractive forces under static or-non-flow conditions whereas on the other hand Yield point is a measurement of attractive forces under flowing conditions.
What does high gel strength mean?
If the mud has high gel strength, it will create a high pump pressure in order to break circulation after the mud is static for a long time. Furthermore, increasing in a trend of 30-minute gel strength indicates a buildup of an ultra-fine solid.
What is the difference between gel strength and yield point of a drilling mud?
What is the difference between yield point and gel strength?
What is yield point in drilling mud?
Yield Point (YP) is resistance of initial flow of fluid or the stress required in order to move the fluid. It can be simply stated that the Yield Point (YP) is the attractive force among colloidal particles in drilling fluid. As per Bingham plastic model, YP is the shear stress extrapolated to a shear rate of zero.
How is gel viscosity measured?
Methods for Measuring Viscosity of Sol–Gel Solution
- Falling sphere viscometer.
- Pulling-up-sphere viscometer.
- Capillary viscometer.
- Rotating cylinder viscometer.
- Cone and plate viscometer.
What is measured by yield strength?
The yield strength is often used to determine the maximum allowable load in a mechanical component, since it represents the upper limit to forces that can be applied without producing permanent deformation.
How do you measure the strength of a gel?
Using texture analysis, gels can be assessed by measuring their mechanical resistance to stress. In a simple gel strength measurement, using, for example, a TA.XT plus Texture Analyser, a cylinder probe typically of 0.5 inch diameter, is lowered into the gel system at a fixed speed.
What is gel strength in soil?
Gel strength is a measure of the inter-particle forces and indicates the gelling that will occur when circulation is stopped. This property prevents the cuttings from setting in the hole. High pump pressure is generally required to “break” circulation in a high-gel mud.
How do you measure the gel strength of mud?
Gel strengths may be measured after allowing the mud to stand quiescent for any time interval of interest, but they are routinely measured after 10 seconds (initial gel strength) and 10 minutes. The dial reading gives the gel strength directly in pounds per hundred square feet.
How is the gel strength measured in a multispeed viscometer?
The same procedure is followed in the multispeed viscometer, except that the cylinder is rotated at 3 rpm with the motor. The maximum deflection is the gel strength. Gel strengths are measured after allowing the mud to stand quiescent for any time interval of interest, but they are routinely measured after 10 s (initial gel strength) and 10 min.