713 results about "Gas lift" patented technology

A gas-lift petroleum well and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well having a well casing, a production tubing, a packer, and a gas-lift valve. The well casing extends within a wellbore of the well, and the wellbore extends through oil and gas zones. The production tubing extends within the casing. The tubing having an opening formed therein, which is in fluid communication with an oil zone. The packer is located downhole in the casing and coupled to the tubing. The packer can have an electrically controllable packer valve, which is adapted to control a flow of downhole pressurized gas from one side of the packer to another. The downhole pressurized gas is provided by a gas zone that the wellbore passes through. The downhole gas-lift valve is coupled to the tubing and is adapted to control a flow of downhole pressurized gas into oil in the tubing for lifting the oil. The gas-lift valve can be an electrically controllable valve. The tubing and casing are used as electrical conductors for supplying power and/or communications downhole. The current in the tubing is routed using a ferromagnetic induction choke to create a voltage potential, which provides electrical power to downhole electrical devices. Also, there may be a bypass passageway to route downhole gas to gas-lift valves. There may also be downhole sensors to measure physical quantities (e.g., pressure). Such measurements can be used for feedback control of downhole electrically controllable valves.

Gas lift valve designs and gas lift systems are described that feature a positive closure mechanism that is highly resistant to significant wear or damage that would result in fluid leakage. A pivotable flapper member is incorporated into a gas lift valve and used as a flow control mechanism. The flapper member provides a positive barrier to fluid flow from the production tubing to the annulus, even after substantial wear or damage.

A system is provided for unloading accumulated liquids and enhancing the recovery of gas from a reservoir having diminished pressure. An annulus between a tubing string and casing is isolated by a packer and continually pressurized with a slipstream of compressed gas while the well continues to produce. A unique valve positioned in the tubing string is shuttled between a production position in which production fluids are permitted to bypass the valve to the surface and a lift position in which the bypass is blocked and an unloading port is opened to vent high pressure annulus gas to the tubing string above the valve, lifting accumulated liquids with it. Preferably, the valve is actuated to the lift position by the impact of a plunger dropped from a lubricator at the wellhead, when the pressure in the annulus has reached a predetermined threshold. When the gas has been vented and the pressure in the annulus drops, the valve is actuated to the uphole production position as a result of the higher reservoir pressure.

An intermittent gas lift well pumping system containing an accumulator, a gas line, a liquid discharge line, and a battery operated controller. By using one or more constrictions in the gas line and acoustical techniques, accurate liquid level is determined in the pumping system for optimum production. Bypasses are connected between the gas line and the liquid discharge line. Each contains a valve that opens at a preset absolute pressure in the gas line, an orifice, and a one-way valve. The bypasses are strategically placed to prevent overloading of the system. A liquid slug sensor on the upper end of the liquid discharge line and a rabbit in this line enables optimum production and gas conservation.

A method for producing gas and water during and after drilling from a subterranean coal seam, including the steps of: (a) drilling a main bore intersecting the coal seam, the main bore having an upper substantially vertical portion, a lower substantially horizontal portion or portions, and a curved portion connecting the vertical and horizontal portions; (b) drilling one sumphole drainage bore exiting the curve or horizontal portion of the main bore and extending in the direction at least partially vertically and downwardly with respect to the horizontal portion of the main bore; (c) collecting gas produced from the coal seam through the main bore and branched bores; (d) removing water and effluent from the main bore both during drilling operations and afterwards through the use of parallel casing, whereby a first casing introduces compressed air or gas to the main bore and the annular space between the first and second casing is used for return of the mixture of water, effluent and air or gas to the surface; and (e) enhancing gas production by simultaneously removing effluent and water from the main bore by utilizing gas lifting or dewatering pumps in the drainage bore after drilling completion. The system includes a directional drilling system having a drill mechanism for cutting an object area of the coal seam, and a drill string connected to the drill mechanism to power and control. The system also includes using two casings or one casing and a compressed air tubing to air lift waste material during drilling and a dewatering device(s) installed in the sumphole drainage bore used to dewater the main bore after drilling completion.

Apparatus, assembly and process for allowing gas lift operations to be conducted along a relatively long perforated interval below a packer in a subterranean well. An elongated segregation member is lowered into locking engagement with a bypass mandrel secured to a tubing string above the packer. This segregation member is configured and dimensioned to define two fluid flow paths. A first flow path extends from the surface of the earth through the annulus formed between the tubing string above the packer and casing secured in the well, the bypass mandrel, a bore through a portion of the segregation member and the interior of the tubing string below the packer. A second flow path extends from the subterranean region penetrated by the well through the annulus formed between the tubing string below the packer and casing secured in the well, the annulus between the segregation member and the packer, and the interior of the tubing string above the packer. Fluid produced into the well from the subterranean region is conveyed to the surface via the second flow path and can be assisted by gas injected into the first flow path via retrievable gas lift valves in the tubing string above and below the packer. Pressurized gas is conveyed via the first flow path to these retrievable gas lift valves.

A reaction vessel assembly achieves enhanced aeration or gas exchange in its gas-in-liquid multiphase mixing reaction through the use of its mixing energy and gas-lift venting, and without the traditionally practiced external line gas sparging. It combines the best of both shake flask and stirred tank reactor vessel and possesses some of the key generic features like cost and parallel experiment advantages of the traditional flasks and shaker hybrid but without their shortcomings like limited gas exchange and uncharacteristic mixing.

An artificial lift system is disclosed for removing wellbore fluids from directional or horizontal wellbores. The artificial lift system incorporates a dual tubing arrangement in which each string contains (respectively) a downhole pumping system or a gas lift system. In one string, a gas lift system, preferably intermittent, is utilized to lift reservoir fluids from below a packer assembly to above a packer assembly. This same tubing string is sealingly engaged to the packer and also contains a concentric inner tubing string which extends through and below the packer into the deviated well bore section. This concentric tubing arrangement provides a conduit for the injection gas and also a conduit for the return of commingled reservoir fluids and injection gas where the commingled fluids exit into the annular void between the dual tubing arrangement and the casing, located above the packer. The second tubing string, which is not sealingly engaged to the packer, contains a downhole pump placed above the exit point of the commingled fluids into the annulus. Because these liquids are trapped above the packer, each time the gas lift system cycles, they accumulate over time and rise above the downhole pump, which pumps the liquids to the surface. In an alternate embodiment of the invention, a plurality of tubing string arrangements are utilized A plurality of tubing string arrangements are sealingly engaged to a packer and operatively connected to a concentric tubing string that extends into the deviated section of the wellbore. A gas lift system, preferably intermittent, is utilized to lift reservoir fluids from below the packer to above the packer. This concentric tubing arrangement provides a conduit for the injection gas and also a conduit for the return of commingled reservoir fluids and injection gas. The commingled fluids exit through a perforated sub in one of the tubing strings above the packer and enter into the annular void between the dual tubing arrangement and the casing. A standing valve is located in the second tubing string below the perforated sub, which effectively trap the liquids in the annulus above the packer. Each time the gas lift system cycles, these liquids accumulate over time and rise above the downhole pump, which pumps the liquids to the surface.

A kit for converting an existing wireline retrievable surface controlled subsurface safety valve (170, 270, 370) into a bypass passageway apparatus (100) allowing the injection of production-enhancing fluid into a wellbore while maintaining the operation of the closure member (374). Bypass passageway (280) can extend between upper (260) and lower (275) adapters external to the existing wireline retrievable surface controlled subsurface safety valve (270) to allow fluid injection bypass thereof. Conversion kit can include a tubing string hanger to suspend a velocity tubing string (407, 507), a gas lift valve (475) for gas lift operations, a locking mandrel (220), and/or a spacer tube (240).

A method of drilling well bore (20) through and below permeable formation (22) bearing such fluids as gas, oil, water wherein drill cuttings may be evacuated by formation fluid (23) being produced through the drill string (26) either by decreasing well head back pressure or by gas lift. Production rate is kept substantially stable by operating choke valves (140) and (142) placed after separator (52). Formation fluid being produced while drilling may be pumped into well bore (20) through annulus (31) or utilized. The unique injector included in the drill string provides for possibility to pump simultaneously into annulus (31) lifting gas and produced liquid and may be operated from the surface. A method and system (90) comprising a plurality of special 3-way valves included in drill string (26), are provided for making connections without interrupting flushing the well bore.

The invention relates to a well drilling method of a through tubing of a gas lift under-balanced coiled tubing, which is applied in the technical field of petroleum well drilling. The through tubing operation way of the coiled tubing is adopted for carrying out under-balanced well drilling or low-pressure well drilling on target well sections at the lower part in a shaft with a drilled upper borehole, wherein the target well sections are a vertical well, a directional well or a horizontal well. The method has the following effects: the adoption of the through tubing operation of the coiled tubing can form three circulation channels by utilizing the coiled tubing, an oil tube and a sleeve, and a matching pipe column has good universality, does not need a special drilling column or an inner tube and does not need to use a rotary blowout preventer and other special equipment; a gas injection channel and a slurry injection channel are independent mutually, thereby being capable of more conveniently controlling the well bottom pressure and the under-pressure value and using an underground power drilling tool and a slurry pulse measurement system which are applicable to slurry well drilling to carry out well drilling operation and trajectory control; and the method does not need to be connected with a single and can keep the continuous circulation during the tripping process and the drilling process, and realize the full-process controllable under-balanced well drilling operation and the full-process controllable low-pressure well drilling operation.

A method of drilling or gas-lifting is disclosed where the methods including the use of a foaming agent and a gas, where the foaming agent is a keratin and the hydrostatic pressure of the fluid in the well is for a portion of the drilling or gas-lift operation less than an hyrdrostatic pressure of the formation being drilled or under production.

The invention discloses a construction method using gas-lift back-circulation hole cleaning for cast piles by drilling in slurry dado, which comprises the following procedures: (1) setting steel guide tube in the rebar cage depending upon the diameter of the pile; (2) installing special guide-pipe epimerite with an inserting port for hi-pressure rubber tube at top of the steel tube; (3) measuring the specific weight of the slurry in the hole, determining the length of the hi-pressure rubber tube to be inserted into the steel guide tube depending upon the specific weight of the slurry; (4) inserting into the steel guide tube the hi-pressure rubber tube having capillary holes at its bottom; (5) connecting the hi-pressure rubber tube with an air compressor; (6) turning on the air compressor to clear out dregs by gas-lift back circulation. The invention is furnished with rapid dreg-clearing speed, clean and through dreg clearing; comparing with prior process, the invention can improve 3-5 times dreg-clearing speed; the invention guarantees the quality of pipe foundation, is free from slurry pollution and good for environmental protection; and can save water and land. The hole-clearing device and equipment used are easy to install and operate, are practical, the materials are readily available, the price is low and the process is convenient.

A elongated plunger assembly for pressurized, conduit-enclosed travel utilized in recovery of hydrocarbon deposits in a ground penetrating oil or gas well. The plunger comprises an elongated mandrel, a plurality of radially movable curvilinear wear pads circumferentially disposed adjacent each end of the elongated mandrel, a pad-edge retaining housing extending on at least one end of the elongated mandrel to enclosably retain the longitudinally distal end of a circumferential array of wear pads onto the mandrel, and a centrally disposed wear pad securement ring arrangement to permit release of a worn wear pad, replacement of the worn wear pad at an inner longitudinal edge thereof, thus to permit simple field-accessable removal and replacement of any particular “conduit-worn”“wear” pad from the mandrel of the plunger.

The invention discloses an airlift type internal circulation intermittent aerobic granular sludge reactor, which comprises an organic glass column, a temperature controller, a water inlet tank, an aeration pump, a water feed pump, a draining pump, a flow meter, a programmable logical controller, etc. The main body of the reactor is the organic glass column and can be divided into an inner sleeve and an outer sleeve, and the inner one is an upspout, while the outer one is a downcast pipe; the ratio of height to diameter is 15. The exterior of the downcast pipe is provided with a water bath heating casing for controlling reaction temperature. Mixed liquor in the reactor flows between the upspout and the downcast pipe in internal circulation to endow granular sludge with a self-balanced micro-ecosystem, the property of the micro-ecosystem is suitable for an up-flow type wastewater treatment system. The reactor adopts the sequence batch operation mode and can realize automatic control by the programmable logical controller. The reactor of the invention has the advantages of flexible operation, compact structure, little sludge remained, good treatment effect, and the like, and can bear high volume load and impact load; furthermore, the reactor has small occupying space and can reduce pork barrel due to relatively large H/D.

The invention discloses a hydraulic jet perforation, fracture and gas lift liquid drainage integrated technical pipe column, which is applied to the oilfield gas well vertical shaft hydraulic jet perforation and fracture and the liquid drainage after the fracture, and a row of pipe columns can complete the oilfield gas well vertical shaft hydraulic jet perforation and fracture and the liquid drainage after the fracture. 2 to 5 gas lifting valves are connected in a casing sequentially from top to bottom by an oil pipe; the lower part of the gas lifting valve is connected with 1 to 4 first-stage hydraulic injectors by the oil pipe; the lower part of each first-stage hydraulic injector is connected with a sliding sleeve base; the lower end of the lower sliding sleeve base is connected with a second-stage hydraulic injector by the oil pipe; the lower end of the second-stage hydraulic injector is connected with a check valve; the lower end of the check valve is connected with a sieve tube and a pipe plug; the first-stage hydraulic injectors are arranged opposite to the top of an upper gas pay; and the second-stage hydraulic injector is arranged opposite to the top of a low gas pay. The invention has the advantages of realizing the jet perforation, fracturing of separated layers and gas lift liquid drainage without moving the pipe columns.

The invention relates to a pressure and water reduction construction method of ultra-deep foundation pit confined water, which is characterized in that field survey and test are performed to obtain the osmotic coefficient of a water-bearing stratum in the field, the quality of a formed hole is ensured by adopting a gas-lift reverse circulation guide pipe, a well casing structure is optimized, the geological conditions of the field can be adapted with a short filter, a tap is ensured to be deeply descended, and the water discharging amount is ensured at the same time. The invention has optimal water reduction effect, reduces influence on peripheral environments without high-power pumping equipment in the water reduction process, reduces energy consumption reduction, is convenient for construction and is especially suitable for the field with a thicker pebble layer, higher permeability and abundant water amounts.