Product Description

Stainless steel well screens are the perfect solution for those looking to improve their well filtration system. With these screens, you can easily filter out unwanted materials such as sand and gravel, ensuring that the water you receive is clean and pure. Not only do these screens provide unbeatable efficiency, but they are also known for their longevity, making them a cost-effective option in the long run. The best part about stainless steel well screen is that they can be customized to suit your unique needs. Whether you require a specific size, shape, or material, these screens can be tailored to meet your requirements. This means that you can ensure that your well filtration system runs smoothly and efficiently, without compromising on quality or performance.

The intake section of a well or screen is where groundwater enters the well. If you think about it, the stainless steel well screen’s main purpose is to keep the filter pack in place. The screen itself is not a filtering device, although it acts as one in the development of a naturally developed well. The stainless steel well screen allows water inflow, retains select material, and is the access to the aquifer for well development and future well maintenance while keeping the well open. Open areas of more than 30% are common for continuous-slot screens with no loss of column strength.

The type of aquifer and the chemistry of aquifer waters can be different from location to location. Screen design should accommodate the varying characteristics. Experience shows that screens having the features described as follow provide the best service in most geologic conditions.

Continuous slot openings around the screen circumference permit maximum accessibility to the aquifer for more efficient development.
Slot openings that provide maximum open area consistent with strength requirements take advantage of the aquifer hydraulic conductivity.
V-shaped slot or pinch-point openings reduce clogging and optimize sand control.
Metal screens must be selected for the intended service life of the well with the water chemistry in mind.
Screens must withstand stresses normally encountered during and after installation.
Using a wide variety of slot openings (from 0.005-inch to 0.250-inch) and appropriate filter pack size can be effective.

Strength Requirements for Well Screens

There are three primary strength considerations for well screens. They are tensile strength or the amount of weight the top of the screen can hold; collapse strength or the differential pressure that can be places on the screen during completion and development; and column strength, which is important if the screen is set on the bottom of the borehole. Typically, casing and screen assemblies are held in tension during completion in deep-well applications.

Tensile Strength

When designing and completing wells, the screen must support the hanging weight of the casing and screen below that joint. The total forces on the screen are the weight of the screen, casing, and drag load from filter packing.

The tensional strength requirement for pipe and screens is a function of the hanging weight of the completion string, but there needs to be additional strength for forces due to filter packing and forces that might be applied to the screen in the event the screen is lowered, then stopped quickly, adding additional forces due to momentum on the string.

Besides the hanging weight, there are additional transient vertical stresses frequently imposed on the casing string. These can be caused by such things as successively lowering and stopping the casing string during installation, occasionally pulling upward on stuck pipe, and the downward frictional forces imparted to the completion string during filter packing and well development. These latter stresses are not readily quantifiable, and therefore, experience and empirical observation must be relied on to guide the design process.

Filter-packing exerts lateral (collapse) and axial (drag) forces on the screen. Field reports indicate that additional load factors—equal to 10% to 25% of the total casing and screen assembly weight—have been measured by weight indicators on the rig floor during filter pack placement.

The loads result from the weight of the pack being distributed by gravity and frictional resistance—among the pack grains—between the borehole wall and the casing or screen surface (Sterett 2007). These additional loads decline when well development is completed, and the filter pack is consolidated against the formation and well screen.

Unlike hydrostatic pressure (which increases proportionately with depth), the lateral grain-column stresses are not isotropic, and pressure is almost independent of grain-column length. It is influenced more by the hole-to-pipe ratio.

It is advisable that the vertical yield strength of a given section of casing or pipe base well screen be at least two times the calculated hanging weight of the underlying materials. The ultimate tensile strength properties of construction materials provide some additional safety factor to prevent parting of the casing string under adverse conditions.

For Type 304 stainless steel, for example, the completion design is based on the yield strength of the material: 30,000 psi for fully annealed Type 304 stainless steel. This is the stress required to permanently deform the metal. The ultimate tensile strength of 60,000 psi provides an additional safety factor against separation failure of the metal.

All in all,stainless steel well screens are a valuable investment for anyone looking to improve the quality and longevity of their wells. With their numerous benefits and impressive performance, stainless steel well screens offer a cost-effective solution that is sure to meet your needs and exceed your expectations. So why wait? Start exploring your options today and discover the many benefits that stainless steel well screens have to offer!

Specifications

More Details

Related Products

Our company

Oasis Oil Tools Co., Ltd, is a famous manufacturer which integrates the research and development, design, manufacture and sell water well screens/Johnson screens/wedge wire screen/rod base screen/continuous slot screen/non-enforced Johnson screen, oil well screens and sand control well screens, bridge slotted well screens, pipe based well screens/perforated base pipe with screen jacket/pipe base screen/reinforced Johnson type screen, perforated pipe (base pipe), gravel pre-packed well screens, passive water intake screens etc. water, oil and gas well filtering products as well as API/Stainless Steel Casing& Tubing and pipes and industrial parts.

Please contact with us for more details.

Our techinical team will give you the best choice.

Mail: oapipe@163.com

Whatsapp:+8613949678537