50 results about "Combustion front" patented technology

An underground reservoir is provided comprising an injection well and a production well. The production well has a horizontal section oriented generally perpendicularly to a generally linear and laterally extending, upright combustion front propagated from the injection well.

An oxygen generator comprising an oxygen generating unit including: (a) a chlorate oxygen generating candle for generating oxygen when ignited; and (b) an ignition device for igniting the candle to initiate oxygen generation from the candle. The candle is arranged during operation to sustain propagation of a plurality of burn fronts therethrough, the fronts propagating in different directions.

The invention provides an enhanced oil recovery process that may be used in light oil reservoirs, and which is particularly beneficial in high-relief formations. The process includes an initial injection of air into the formation through an injection well to support the in-situ combustion and mobilize formation fluids. Produced flue gas is recovered and recycled into the formation by injection through an injection well. Initially, gas production is restricted for the purpose of increasing the gas injection to recovery ratio to pressurize the formation. With an increase in formation pressure, the rate of air injection is gradually reduced as the rate of recovered flue gas injection increases. Combustion front propagation in the formation is controlled by the rate of production at each actively producing well to ensure good horizontal sweep across the well and to prevent channeling to one or more production wells.

The present invention is a method and apparatus for the enhanced recovery of petroleum fluids from the subsurface by in situ combustion of the hydrocarbon deposit, from injection of an oxygen rich gas and drawing off a flue gas to control the rate and propagation of the combustion front to be predominantly horizontal and propagating vertically downwards guided by the vertical highly permeable hydraulic fractures. Multiple propped vertical hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a highly permeable proppant containing hydrodesulfurization and thermal cracking catalysts. The oxygen rich gas is injected via the well bore into the top of the propped fractures, the in situ hydrocarbons are ignited by a downhole burner, and the generated flue gas extracted from the bottom of the propped fractures through the well bore and mobile oil gravity drains through the propped fractures to the bottom of the well bore and pumped to the surface. The combustion front is predominantly horizontal, providing good vertical and lateral sweep, due to the flue gas exhaust control provided by the highly permeable propped fractures.

Air and ammonia gas are introduced into a subterranean formation during the in-situ combustion to increase the mobility of hydrocarbons in a subterranean formation and facilitate recovery of the hydrocarbons from the subterranean formation. The air supports in-situ combustion of a portion of the hydrocarbon within the subterranean formation to form water and establish a combustion front. The ammonia gas contacts the hydrocarbons ahead of the combustion front and reacts in-situ with naphthenic acid in the hydrocarbon to form a surfactant. The hydrocarbons, water and surfactant then form an oil-in-water emulsion that drains more freely through the formation. A production well, in fluid communication with the hydrocarbons ahead of the combustion front, may be used to remove the oil-in-water emulsion from the subterranean formation.

The invention provides a method for exploiting thickened oil or asphalt. The method for exploiting the thickened oil or asphalt comprises the steps that steam is injected into a stratum, and then air and an alkali compound are injected so that the air and the alkali compound can enter an underground reservoir stratum. According to the method for exploiting the thickened oil or asphalt, flowing of the thickened oil or asphalt in the reservoir stratum can be promoted. The method for exploiting the thickened oil or asphalt further comprises the steps that a combustion front is established in part of the thickened oil or asphalt in the reservoir stratum through combustion of oil in-situ, air and the alkali compound are injected into the stratum during combustion of oil in-situ, and the alkali compound makes contact with hydrocarbons at the position of the combustion front and reacts with naphthenic acid in the hydrocarbons so that a surface active agent can be formed.

Method and apparatus of producing gas pressure pulses in a dust-deposit cleaning apparatus. The apparatus comprises a combustion chamber and an amplifying horn. According to the method a combustible gas and oxygen is fed into the combustion chamber, which has a generally elongated shape, the gas mixture is ignited for generating a pressure pulse, and the pressure pulse is released from the chamber and conducted to the amplifying horn. The gas mixture is ignited to generate an initial explosion which causes a pressure wave, which is reflected from the inner walls of the chamber end to form a collision zone, in which the initial explosion is at least partially transformed into a detonation. The combustion front is reflected from the gas inlet end and compressed at the other end of the chamber and released to the amplifying horn. By means of the invention, sound levels of about 165-170 dB can be produced at low fuel consumption.

The invention discloses a double-point control method of a 450 m<2> sintering machine, and belongs to iron making methods. The method comprises a method for controlling a burning through point and is characterized in that parameter control for a combustion front point is added, that is, 6 exhaust gas temperature detection facilities are arranged in width directions of bellows ranging from 11# to 18# of the 450 m<2> sintering machine; at the same time, temperatures at the bellow 11# and a bellow 12# are set to be temperatures of the exhaust gas at the combustion front point during sintering; and an actual detection temperature change trend curve is compared with a set temperature, and corresponding measurements are taken. According to the method, the parameter of the burning through point can be known within 15 minutes after ignition, and deviation rectifying operation can be performed in 25 minutes after a deviation rectifying parameter is issued, so that the deviation rectifying operation time is reduced, and the product quality of a sinter is improved.

An in-situ combustion process which process does not employ one or more separate gas venting wells. At least one vertical production well having a substantially vertical portion extending downwardly into the reservoir and a horizontal leg portion extending horizontally outwardly therefrom completed relatively low in the reservoir is provided. At least one vertical oxidizing gas injection well, positioned above and in spaced relation to the horizontal well, is positioned laterally along the horizontal well approximately midsection thereof. Oxidizing gas is injected therein and combustion fronts are caused to progress outwardly from such injection well in mutually opposite directions along the horizontal well. Preferably a plurality of injection wells are provided along the direction of the horizontal well, and oxidizing gas is injected in each and combustion fronts caused to progress outwardly and in opposite directions from each, and oil is caused to drain down into the horizontal well, which oil along with hot combustion gases is produced to surface.

The invention relates to an angle type porous medium burner. The angle type porous medium burner comprises a gas inlet, a combustion front chamber, a burner shell, a protection zone, a preheating zone, a buffer zone, a combustion zone and a flue gas outlet; the preheating zone, the buffer zone and the combustion zone are collectively called as porous medium zones and are filled with porous mediummaterials; and the preheating zone and the combustion zone are respectively and gradually expanded inwards and outwards by a certain angle alpha, and meanwhile, the buffer zone is arranged in the preheating zone and the combustion zone, so that the air flow speed is reduced, and the flame inclination phenomenon is prevented. The limit range of the flame stabilizing speed can be obviously widened,flame tempering and fire dropping are effectively prevented, the outlet radiation efficiency is improved, and meanwhile, the occurrence of thermal shock damage of the porous medium is reduced.

The invention discloses a method for exploiting a heavy oil reservoir with edge water invasion at a final huff and puff stage. The exploiting method includes the steps that a steam flooding well pattern is deployed in a main body non-water-invasion area, and a fire flooding well pattern is deployed in an edge water invasion area; the joint of the steam flooding well pattern and the fire flooding well pattern is separated by a production well row; and steam flooding and fire flooding development are carried out at the same time. According to the method for exploiting the heavy oil reservoir with the edge water invasion at the final huff and puff stage, the edge water invasion area can be effectively utilized, the edge water invasion can be inhibited by utilizing the plugging effect of a fire flooding high-temperature combustion front edge on a high-permeability layer and the vaporization effect of the high-temperature combustion front edge on water, and the main body steam flooding heat utilization rate is improved, so that the steam flooding development effect is improved, the overall development level of a block is improved, and the problem that continuous development is difficult due to the fact that no effective conversion mode exists when edge water invades into the heavy oil reservoir in the final huff and puff stage is solved.

Methods and systems produce petroleum products from a formation by a steam assisted process followed by an in situ combustion process. The steam assisted process utilizes an injector and first producer to form a steam chamber within the formation as the products are recovered. The in situ combustion then starts by injecting an oxidant into the formation and ignition of residual products. A combustion front advances toward a second producer that may be offset in a lateral direction from the first producer. Heat and pressure from the in situ combustion sweeps the products ahead of the combustion front to the second producer for recovery.

The invention relates to a medium-sized lumps fire grate segment, a framework of which is provided with three adapter sleeves, wherein, one adapter sleeve is arranged in the middle at one side of the framework, and the other two adapter sleeves are arranged at the two ends of the other side of the framework, and the three adapter sleeves on the back of the framework of the fire grate segment are connected with each other by a fixing bracket which is moulded together with the ramework of the fire grate segment into a whole; a plurality of fire grate segments are connected in series to form a hearth through a long pin through connection sleeve hole, so that the whole structure has high strength, difficult burnout, long service life, little wastage and low cost; a combustion front of the fire grate segment is provided with 2-4 lines of ventilating slots, a reinforcing rib is arranged in the middle of each line of ventilating slots, coal is paved on a combustion front of the hearth, and air in a draught chamber enters the coal through the ventilating slots, thus the ventilation effect is good, and the coal is fully burnt.

The invention discloses a method for improving shale oil reservoir recovery efficiency by cracking a reservoir through catalytic oxidation combustion. The method comprises the following steps that a catalyst is selected; a mixture slug of a catalyst and an organic solvent is injected into a shale oil reservoir subjected to staged fracturing of a horizontal well, and the well is soaked for a period of time; and then air is injected into the shale oil reservoir, the shale reservoir is fractured through catalytic oxidation/combustion, and the flow conductivity of shale oil is enhanced. By means of the method for improving the shale oil reservoir recovery efficiency by cracking the reservoir through catalytic oxidation combustion, the shale oil reservoir ignition difficulty can be obviously reduced, the combustion efficiency and the combustion front edge stability can be improved, the shale is fractured by fully utilizing the oxidation/combustion chemical effect, the synergistic effect is generated with an existing hydraulic fracturing method, the reservoir pore-fracture structure is improved, and the recovery efficiency is improved.

The invention discloses a method for adopting linear fireflood for producing tail gas for burying and utilization. According to the method, a row of well drains in a well pattern is divided into gas-injection well drain bodies, other rows of well drains are divided into producing well drain bodies, ignition and gas injection are conducted on the first row of gas-injection well drain bodies, afterthe combustion front crosses the first row of producing well drain bodies, the first row of producing drain bodies are changed into the second row of gas-injection well drain bodies, and the first rowof gas-injection well drain bodies are changed into reinjection wells in which foam liquid and fireflood tail gas are injected; the foam liquid and the fireflood tail gas are injected into the reinjection wells, the injected foam liquid forms a foam blocking wall between the first row of gas-injection well drain bodies and the first row of producing well drain bodies, and the foam blocking well blocks the injected fireflood tail gas and the second row of gas-injection well drain bodies; meanwhile, the fireflood tail gas is buried under the wells; when the combustion front crosses the second row of producing well drain bodies, the second row of producing well drain bodies are changed into the third row of gas-injection well drain bodies, and the second row of gas-injection well drain bodies are changed into reinjection wells in which the foam liquid and the fireflood tail gas are injected; analogy is conducted gradually until the combustion front crosses the N th row of producing welldrain bodies.