(en)A dynamic filtration unit for drilling and completion fluids employs an adjustable size annulus, high filtration pressures and temperatures, automatic filtration collection and measurement, and natural or artificial filters.

1.ApplicationNumber: US-93205386-A
1.PublishNumber: US-4790933-A
2.Date Publish: 19881213
3.Inventor: QUIGLEY; M. SCOTT
SEAL; HENRY A.

4.Inventor Harmonized: QUIGLEY M SCOTT(US)
SEAL HENRY A(US)

5.Country: US
6.Claims:
(en)A dynamic filtration unit for drilling and completion fluids employs an adjustable size annulus, high filtration pressures and temperatures, automatic filtration collection and measurement, and natural or artificial filters.

7.Description:
(en)BACKGROUND OF THE INVENTION
This invention is directed to a dynamic filtration unit for drilling and completion fluids. Although some dynamic filtration equipment has been developed, the selection of commercially available equipment for measuring dynamic filtration is very limited. Consequently, many researchers have built their own dynamic filtration equipment. None of these, however, are known to provide typical wellbore temperature. Only one is believed to be capable of operating at temperatures above 250° F., and only one known to applicants, can simultaneously measure dynamic filtration and fluid viscosity.
U.S. Pat. No. 3,984,317, for example, discloses apparatus for washing solids in a slurry wherein a dynamic filtering system is provided for separating the solids-containing fluid to form a concentrate and a filtrate. A new and improved dynamic filtration unit and process of using same has now been devised whereby some of these prior art shortcomings have been overcome.
SUMMARY OF THE INVENTION
The present invention is more particularly directed to dynamic filtration apparatus and a process for using same with mixtures of drilling and completion fluids. The apparatus is capable of operating at high filtration pressure, relatively high temperatures and has automatic filtration collection and measurement means utilizing natural or artificial filters.
It is an object of this invention to provide equipment and a process of using same whereby improved means of measuring dynamic filtration is provided; whereby typical wellbore temperature is established; and whereby simultanesous measurement of dynamic filtration and fluid viscosity is possible. Other objects are, of course, within the scope and purview of this invention as those of ordinary skill in the art will readily understand.


BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts static and dynamic filtration.
FIG. 2 depicts a drilling fluid circulating unit with the dynamic filtration unit of the present invention.
FIG. 3 shows the dynamic filtration unit in more detail.


DESCRIPTION OF PREFERRED EMBODIMENTS
Generally speaking, the dynamic filtration unit in accordance herewith employs an adjustable size annulus, filtration pressure of 0-1000 psi, temperature up to 500° F., automatic filtration, collection and measurement and natural or artificial filters.
The DRL (Dallas Research Laboratory) Drilling Fluid Circulating Unit (DFCU) is used for preparing, aging, and dynamic evaluation of water-based drilling and completion fluids. FIG. 2 shows the major equipment of the DFCU. Lab fluids or field samples are prepared in the mixing tank and then aged as required. The pump circulates the fluid while the accumulator maintains pump suction pressure above the fluid vapor pressure. Temperature control is provided by successive cooling and heating sections upstream of the viscometer. Fluid density and flowrate are measured by a mass flowmeter ahead of the dynamic filtration unit. The DFCU can operate at temperatues ranging from about ambient to about 500° F. and pressures of atmospheric to about 1500 psi.
FIG. 1B shows the dynamic filtration process. Filter cake forms when the pressure in the wellbore exceeds the formation pressure. For dynamic filtration, the filter cake thickness increases until the rate of deposition equals the rate of erosion by the flowing mud. During this cake-building time the filtration rate into the formation also increases. The filtration rate stabilizes when the filter cake thickness reaches equilibrium.
The dynamic filtration unit contains three hollow cylindrical filters centralized inside vertical pressure housings as shown in FIG. 3. The nominal ID (inside diameter) of each housing is 1.75 inch, and overall length inside is approximately 26 inches. The OD (outside diameter) of the hollow filters may vary from about 0.500 in. to about 0.750 in. All the hollow filters may simultaneously have the same or three different outside diameters thereby providing adjustable size annulus geometry. The test fluid flows through the annulus created by the inside diameter of the housing and the outside diameter of the filter. The design shown in FIG. 3 accurately provides the full-scale annular shear rate, filtration pressure, and formation permeability.
Porous stainless steel filters with permeabilities ranging from 3.5 to 850 md and preferably from about 5.0 to 740 md and Berea Sandstone filters with 500 md permeability were used. However, suitable filters include any conventional filters known in the art and include both natural and artificial filters. Some suitable filters are limestones and sandstones or any rock with permeability greater than about 0.1 md. Each hollow filter is connected to a vertical collection tube which accurately measures the volume of filtrate passing through the filter. The differential pressure across each filter is individually controlled with nitrogen inside the collection tube.
When the DFCU operating conditions and filtration pressures have stabilized at desired values, a valve in the capillary tubing from each filter is opened to start the test. A data acquisition computer periodically measures the total volume of filtrate in each collection tube. The DFR (dynamic filtration rate) for each filter is calculated from these values.
Referring to FIG. 2, the Drilling Fluid (completion fluid) Circulation Unit includes a mixing vessel in which fluid to be tested is mixed, an aging vessel for aging the fluid mixture as desired. The accumulator pressurizes the fluid (drilling and/or completion fluid) to a constant pressure which is above the vapor pressure of the fluids. The fluid is pumped in a recirculating loop by the pumping means. Pump speed controls the flow of fluid from accumulator, temperature is controlled by successive cooling and heating means. The measurement section comprises the viscometer and the flow rate and density determinators which are upstream of the dynamic filtration unit.
Although the present invention has been described with preferred embodiments, it is to be understood that modifications and variations may be resorted to, without departing from the spirit and scope of this invention, as those skilled in the art will readily understand. Such modifications and variations are considered to be within the purview and scope of the appended claims.