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1 • • lohnst ' Multichannel Tubing Seals& Packers A multilevel well that uses a continuous length of The CMT tubing can be sealed in place with sand and multichannel tubing has the advantage over other bentonite layers in the usual manner using a tremie pipe multilevels in that there are no joints. This significantly or with the Solinst Mini Sand Bentonite Injector, Model ' reduces the cost of installing wells and at the same time 561M. If the application is in loose sands, direct burial increases the reliability of the system. The CMT tubing can be used, allowing the sand to collapse around the is very simple and convenient to use, as it gives full tubing. Pre-packed bentonite seals are also available flexibility m to where monitoring zones are located,and which have bentonite pellets inside a plastic mesh, so t one length of tubing can be used for a number of well that they can be slipped onto the tubing and then installations. It has a ridge down its entire length to clamped quickly in place prior to Installation. allow for easy identification of specific channels. Ports and packers can be assembled onto the tubing in ' the field,immediately after drilling,to reduce open hole time and potential cross-contamination between zones. Plan View of CMTTubbingang CMT T ' Pre-packed Bentonite Packer Double-Acting Packers . Ridge Double-Acting Inflatable Packers' are ideal for use in ' - situations where a CMT System is to be put inside an tri existing casing,or in a smooth rock borehole and when Pon Inlet Holes removal of the system for decommissioning or reuse is- important. w R Double Acting Packers have a rubber gland on the inside as well w the outside. Both glands inflate and deflate at Polyethylene the same time. When a vacuum is applied to a packer, Hot Met Seal i the inner gland retracts and the packer slides easily into ' Foam Plug position on the CMT tubing. Air vent Hole The vacuum is then released so that the packer grips onto the tubing and a clamp top and bottom ensures ' that the packer does not shift position during installation. To create a port:channel is sealed,holes are drilled into the tubing and covered by a stainless steel screen or �. ;„ pre-packed sand pack ��` ' Ports u The number and location of ports may be determined in "� �1. s advance of drilling,or after coring. Holes are drilled in a vertical line into a given channel at a specified depth , .:, . ' according to the zone to be monitored, forming a port. The channel is sealed with a polyethylene sealant below IF the port openings and a vent hole is left just below the seal to allow air to escape as the system is lowered into ' the hole. Inflating the A stainless steel mesh is fixed in place over the port to Applying a Sliding the packer Double-Acting prevent fines from entering, or pre-packed sand packs MCI$ ^ into position Packers are clamped onto the tubing over the holes.The screen The packers are connected in fine with flexible inflation ' kits come in a variety of mesh sizes, complete with tubing, and after installation into the well an inflation clamps, hot melt polyethylene glue and plugs. vessel is filled with water and an air source is used to Each channel is sealed at the bottom to prevent cross hydraulically inflate the packers. contamination, and a vent hole is cut into the channel Systems using Double Acting Packers can easily be ' just below the port. This allows water from the removed and the packers used elsewhere or in some monitoring zone to fill the channel below the zone, cases the system may be repositioned so that the ports avoiding buoyancy. are located at different depths within the same well. Patents Pending High Quality Groundwater Monitoring Instrumentation swffint