Abstract:
Methods, apparatus, and systems for low-flow sampling of a fluid source. One illustrative embodiment of the invention is directed to a method for manually sampling a fluid source in a well, including exerting a downward pressure on a sample tube, disposed within a well insert, to allow fluid to pass from the well through a portion of the well insert and into the sample tube to fill at least a portion of the sample tube with the fluid. Another illustrative embodiment of the invention is directed to a method for securing a well insert to an inner wall of a well, including arranging stabilizers on the well insert in a non-extended position, introducing the well insert into the well, arranging the stabilizers on the well insert in an extended position, and expanding a portion of a gasket on the well insert such that the portion of the gasket conforms to a circumference of the inner wall of the well.
Abstract:
A device (10) for collecting fluid samples from a subsurface (100), injecting fluids into a subsurface and measuring the hydrostatic pressure of groundwater in a subsurface is described. The device includes an outer tube (12) with a center bore (12D) and openings (12E) at one end (12B) and a rigid inner rod (18) configured to be telescopingly inserted into the center bore of the outer tube. The inner rod provides support and prevents damage to the outer tube during insertion into the subsurface. The device is inserted into the subsurface until the openings in the outer tube are adjacent the testing area. The inner rod is then removed from the outer tube. To collect fluid samples, the samples are retrieved from the fluid which has moved from the subsurface through the openings to the center bore of the outer tube. To inject fluid into the subsurface, the fluid is injected into the center bore and flows through the openings to the subsurface. To use the device to measure the hydrostatic elevation of the groundwater in the subsurface relative to the surface water body, a pressure measuring device is connected to the outer tube.
Abstract:
Methods and apparatus are provided which permit well testing operations to be performed downhole in a subterranean well. In various described methods, fluids flowed from a formation during a test may be disposed of downhole by injecting the fluids into the formation from which they were produced, or by injecting the fluids into another formation. In several of the embodiments of the invention, apparatus utilized in the methods permit convenient retrieval of samples of the formation fluids and provide enhanced data acquisition for monitoring of the test and for evaluation of the formation fluids.
Abstract:
This invention is directed toward apparatus and methods for gathering liquid samples from a reservoir of liquid using a submersible pump and subsequently retrieving the samples for analysis. The invention is more specifically directed toward the gathering and preparing of water samples for analysis for tritium content, where the samples are collected from underground formations penetrated by a borehole or collected at varying depths in surface canals and the like. The samples are subsequently transferred to the surface of the earth for analysis. The submersible pump is operated by means of a surface valving system and solenoid systems mounted on the submersible pump. The pump inlet valve is set to open or "crack" at a predetermine pressure, however the pump is not filled until a vacuum is applied to the pump. After filling, the pump is purged thereby transporting the sampled liquid to the surface by applying pressure. Vacuum and pressure are supplied to the submerged pump by means of a surface vacuum/compressor system. Electrical valves are mounted on the submersible pump.
Abstract:
The invention relates to a sampling device for taking a water sample under pressure from a large depth in a hole bored in the earth. The sampling device comprises parting elements (1) for separating a sampling interval (2) from the rest of the bore hole (3); a flow pipe (4) for extracting the water from the sampling interval; a sample container (5); a sampling pipe (6) for passing up the water supplied by the flow pipe to a point above the sampling device; a valve (7) for directing the water flow directly from the flow pipe into the sampling pipe or from the flow pipe via the sample container into the sampling pipe and for closing and opening the sample container; and a pressure pipe (8) for supplying an operating pressure to the parting element (1) and
Abstract:
A borehole drilling apparatus has a jacket attachable to a well head and through which a drill rod passes and which carries pressurized drilling fluid to a working end of the drill rod and out into an annulus of the borehole. The jacket has a drill rod seal and an outlet port leading from the interior of the jacket to a pressure regulator. The pressure regulator comprises an annular space through which fluid can flow from an inlet to an outlet. The annular space is defined between an inner rod and a surrounding elastomer pipe. In use, the elastomer pipe is squeezed radially inwards toward the inner rod by fluid pressure maintained between the outside of the elastomer pipe and a surrounding housing. A sampling system is in communication with the outlet port at a location upstream of the regulator. The sampling system intercepts a proportion of the drilling fluid passing to the regulator for enabling sorption pressures, gas contents, bubble points or other characteristics of the return fluid and entrained contents to be determined.
Abstract:
A downhole formation test pump includes a progressive cavity pump having a helical rotor received in a helical cavity of a stator. The pump may be disengaged by withdrawing the rotor from the stator to provide a bypass position so that the downhole formation being tested can be allowed to flow freely if it is capable.
Abstract:
A sampling device for sealed positioning within the casing of a well contains a stripping chamber for stripping a ground water sample of its volatile compounds at or near the point of collection. In one embodiment, the stripping chamber includes a piston which is raised above the top surface of the sample to create a head space, and an injector for injecting inert gas into the sample, causing the volatile compounds to be released into the head space, whereupon they exit the chamber via a vapor outlet duct leading out of the well. In a second embodiment, the stripping chamber includes a tube having a sidewall formed of a semi-permeable membrane, and an injector which injects an inert gas into the bore of the tube. The device may also include a sensor mounted within the stripping chamber, and a valve for directing a calibration gas into the chamber.
Abstract:
A drill stem testing system which does not require rotation or axial displacement of an associated drill string to actuate valves and pumps is described. The system includes a drill stem constructed in a number of sections which are interconnected with screw-type connections. The housing contains test-related devices such as a pump for inflating packers with wellbore fluids to isolate a test region, a packer deflation valve for exhausting fluids from the packers when testing is complete, a test flow valve for introducing wellbore test flows into the housing, and a pressure equalization valve for placing the test region in communication with external wellbore regions prior to packer deflation. Each of these devices is adapted for electric actuation and contacts an internal power line extending centrally through the interior of the housing. The power line is construced in line segments which mate with one another when their associated drill stem housing sections are joined to provide a continuous power flow path. An external power line is extended from the surface through a supporting drill string to engage the internal power line. Power switching devices permit an operator to apply power selectively to each of the test-related devices to effect a testing procedure.
Abstract:
The invention relates to methods and apparatus for agitating and heating a sub-surface volume of soil to liberate volatile compositions therefrom which are transmitted through a special flow passage created through the soil to the soil surface where they are analysed to determine the presence or absence of selected contaminants. A low pressure sink is provided to ensure proper flow of volatiles rapidly to the surface and to prevent contamination of adjacent soil blocks or cylinders during treatment.