Abstract: A method of preventive well maintenance with pumping equipment in the well for well rehabilitation using CO2 with varying lengths of producing intervals utilizing varying methods to deliver cleaning energy and varying porosity of aquifers to determine varying quantities of energy over the entire well structure.

Abstract: A method of well rehabilitation using CO2 comprises a more effective distribution of effective CO2 energy throughout an entire well structure including all parts of a producing interval of a well and surrounding formation. The CO2 phase changes are controlled during CO2 injection to cause surging agitation within a well bore and surrounding formation and allow CO2 energy to reach all areas of the well, and the CO2 energy utilized includes at least one of chemical energy, thermal energy and mechanical energy.

Abstract: The invention relates to a method of well rehabilitation using CO2. The improvement comprises providing a more effective distribution of effective energy throughout the entire well structure including all parts of the producing interval of the well and surrounding formation and distributing energy throughout the entire well structure. The improved method is obtained by controlling CO2 phase changes during CO2 injection to cause surging agitation within the well bore and surrounding formation and allowing CO2, mechanical energy and optionally chemical energy to reach substantially all area of the well.

Abstract: The present invention relates to a method of removing deposits from various types of wells (17) including environmental recovery, water supply, horizontal, barrier, injection, recharge, and/or disposal wells (17). The method includes equipping a well (17) with an automated energy delivering system that is attached to the well (17). The energy delivering system is used to clean the surface of the well (17) and aquifer by supplying various types of energy to the well (17) and aquifer via injection lines (5, 6, 11, 12 and 13) and an educator pipe (10). A pump (14) is used to pump the energy through flow valves (20 and 21) and injection lines (5, 6, 11, 12 and 13) and into the well (17). The energy that is supplied to the well (17) mobilizes any deposits in the well (17) and aquifer and cause them to flow into and up the wellbore thereby cleaning the well (17) and aquifer.

Abstract: The present invention relates to a method of removing deposits from various types of wells (17) including environmental recovery, water supply, horizontal, barrier, injection, recharge, and/or disposal wells (17). The method includes equipping a well (17) with an automated energy delivering system that is attached to the well (17). The energy delivering system is used to clean the surface of the well (17) and aquifer by supplying various types of energy to the well (17) and aquifer via injection lines (5, 6, 11, 12 and 13) and an educator pipe (10). A pump (14) is used to pump the energy through flow valves (20 and 21) and injection lines (5, 6, 11, 12 and 13) and into the well (17). The energy that is supplied to the well (17) mobilizes any deposits in the well (17) and aquifer and cause them to flow into and up the wellbore thereby cleaning the well (17) and aquifer.

Abstract: The present invention relates to a method of removing deposits from various types of wells (17) including environmental recovery, water supply, horizontal, barrier, injection, recharge, and/or disposal wells (17). The method includes equipping a well (17) with an automated energy delivering system that is attached to the well (17). The energy delivering system is used to clean the surface of the well (17) and aquifer by supplying various types of energy to the well (17) and aquifer via injection lines (5, 6, 8, 11 and 12) and an educator pipe (10). A pump (14) is used to pump the energy through flow valves (21 and 20) and injection lines (5, 6, 8, 11 and 12) and into the well (17). The energy that is supplied to the well (17) mobilizes any deposits in the well (17) and aquifer and cause them to flow into and up the wellbore thereby cleaning the well (17) and aquifer.

Abstract: A packer tool for use in a wellbore having a bottomhole pressure p, the tool comprising: a mandrel assembly; a stabilizer on the mandrel assembly, for releasably engaging the wellbore; a packing element in an annular recess having a floor and two facing walls, the annular recess being transversely compressible into a compressed position and disposed about the mandrel assembly; and a piston assembly for driving compression of the packing element annular recess, the piston assembly having a plurality of pistons connected to act in tandem, the pistons having a total piston face surface area a such that an application of pressure of p? to the piston assembly generates a force f greater than p.

Abstract: An improved method of controlled energy delivery utilizing solid, liquid, and gaseous carbon dioxide (CO2) into a water well and the surrounding aquifer to remove deposited material which may cause loss of capacity in wells and a variety of water quality problems. After proper study and evaluation of problems associated with a well to be treated, adequate injection of the required amount of CO2 and energy is achieved by real-time monitoring during the injection and manipulating the phase changes in the CO2 that take place in the well and the aquifer.

Abstract: The present invention relates to a seal element for a wellbore which includes a support member, a bag positioned on the support member and a eutectic material positionable in the bag. The bag may be axially compressed and axially extended along the support member thereby permitting sealing and unsealing of an annulus in a wellbore. The eutectic material may be a phase changing salt.

Abstract: The present invention relates to a spring element. The spring element includes a metal ring with a central aperture and radial pleats formed on the metal ring. The radial pleats flatten when pressure is applied axially to compress the ring such that the metal ring increases in effective diameter. The seal element may be used to radially seal an annular bore.

Abstract: The invention uses apparatus, methods or systems, e.g., fine pore diffusers (18), to saturate ground water with a gas, preferably oxygen, but also possibly methane, air, inert or noble gasses and/or carbon dioxide. The pore diffusers (18) can be in a ring of aeration injection wells (16) in a large concentric ring around a production well. By increasing the dissolved oxygen level in the ground water, undesirable constituents such as iron or arsenic are lowered in concentration. Methods can be employed to optimize the ground water treatment by injection of other substances, such as iron, as well as predict, model, design, monitor and maintain the treatment process.

Abstract: A straddle packer tool comprises a mandrel and a housing. Spaced packers are carried by the housing. A plurality of bypass ports are arranged in the mandrel and housing for aligning in several positions: a first downhole position for bypassing fluid around the packers and through the mandrel; an intermediate position wherein the bypass ports are misaligned and a first internal pressure actuates the packers to isolate a zone and a second higher internal pressure releases a stop for enabling relative movement to an uphole position wherein the bypasses are misaligned and the mandrel's bore is opened to isolated zone.

Abstract: Shaped charge liners, typically used in perforating guns, are formed from a zinc alloy of zinc and other metals such as aluminium and magnesium. The liners are formed into desired shapes, for example, by melting ingots and casting the alloy, or by machining bars formed from the alloy, or by stamping strips formed from the alloy, or by pressing powder formed from the alloy.

Abstract: A downhole tool hydraulic firing head includes an automatic drain that is opened when the piston is driven to fire. The automatic drain includes a vent opening from the bore and a sleeve disposed within the bore to move axially with the piston. The sleeve is moveable from a position covering the vent opening to a position clear of the vent opening. A locking collet is disposed between the sleeve and the housing, which locks the sleeve into the position, clear of the vent opening, when the sleeve is moved into that position. This locks the sleeve against returning to the position covering the vent opening when it is urged to move in that direction such as, for example, by venturi forces of the evacuating fluid or by pressure generated from the explosive charges. The firing head is useful to detonate downhole explosive charges, such as those in a perforating gun.