36 results about "Brine mining" patented technology

The invention discloses a wastewater zero discharge system of chlorine-alkali industry. The system includes a sodium hypochlorite wastewater treatment system, a centrifugal mother liquor treatment system, a comprehensive wastewater treatment system, a domestic sewage treatment system and a circulating water system. Well water is treated by a water desalination plant, and the generated desalinated water is transported to a caustic soda device and a PVC polymerization device to be used in production. One part of the concentrated saline water generated by the water desalination plant is used for an acetylene generator, and the other part is delivered into a dilute saline water trough and returned to a brine well so as to be used in brine mining. A production water station is mainly used for an acetylene purification device, the PVC polymerization generation device, the caustic soda device and an acetylene section alkali washing tower. The sodium hypochlorite wastewater discharged from the acetylene purification device is treated by the sodium hypochlorite wastewater treatment system to reach the standard, and is then returned to the saline well to be used for saline mining. The centrifugal mother liquor from the PVC polymerization generation device is treated by the centrifugal mother liquor treatment system to reach the standard, and is then returned to the circulating water system. The production wastewater from the PVC polymerization generation device and the production wastewater from the caustic soda device are treated by the comprehensive wastewater treatment system to reach the standard, and are then returned to the saline well to be used for dilute saline water saline mining.

The invention discloses a salt cavern type gas storage cavity construction process oil-water interface detection method which includes the steps: mounting a high-precision pressure meter and a density meter on a wellhead; respectively measuring the wellhead pressure and the liquid density of a brine mining pipe and an oil filling pipe; substituting measured data into a calculation formula derived according to equivalent 'U'-shaped pipe model construction, and performing oil-water interface calculation to obtain the real depth of an oil-water interface. By the detection method, a downhole tripped detection instrument is omitted, construction risks caused by cable damage or instrument damage in the tripping process are avoided, measure process is simplified, and the complicated technological process of tripping a string again in change of the design depth of the oil-water interface is avoided.

The invention relates to a method for exploiting natural gas hydrates by injecting saturated hot brine. The method is characterized in that the saturated hot brine is injected into a horizontal seam net which is cracked at the top of a natural gas hydrate reservoir stratum in advance, the natural gas hydrates are rapidly decomposed by virtue of the high salinity and the temperature of the hot brine, and moreover under the action of gravity differences, on one hand, a natural gas is extracted from the upper part of the reservoir stratum, and on the other hand, the hot brine is mixed with decomposed water to continuously decompose the natural gas hydrates. By adopting the method, the injection quantity is greatly reduced, thermal energy input is reduced, decomposition of the natural gas hydrates can be accelerated because of pressure drop formed by reservoir stratum volume voidage, in addition, production wastewater does not need to be fed back, and the natural gas hydrates can be economically and continuously exploited.

The invention relates to a semi-closed underground brine mining system and a construction method thereof. The semi-closed underground brine mining system comprises a gas pressing device, a first waterresisting layer, a second water resisting layer, a brine storage layer positioned between the first water resisting layer and the second water resisting layer, a partition wall and brine collecting channels. The upper end of the partition wall extends to the first water resisting layer, and the lower end extends to the second water resisting layer; and the brine storage layer is divided into multiple closed spaces by the partition wall, the first water resisting layer and the second water resisting layer. The brine collecting channels and brine outlets are excavated in a top salt rock layersof the closed spaces; the closed spaces are horizontally penetrated by the brine collecting channels to form semi-closed spaces; and the semi-closed spaces are brine collecting blocks. A gas pressingwell is arranged in each brine collecting block; brine outlets are excavated in the opening sides of the brine collecting blocks; and the brine outlets penetrate to the brine storage layer, and communicate the brine storage layer with the brine collecting channels. The semi-closed underground brine mining system can reduce the brine collecting cost, greatly improves the brine collecting amount, improves the mining efficiency, and improves the recovery rate.

The invention discloses a brine mining well casing pipe and a brine mining well structure, relates to the technical field of mineral salt mining, and solves the problem that a brine mining well is likely to be blocked. The invention has the main technical scheme that the brine mining well casing pipe comprises a pipe wall and a flowing channel surrounded by the pipe wall, wherein a plurality of through holes which communicate with the flowing channel are formed on the pipe wall, the brine mining well casing pipe is used for being arranged on the horizontal section of a water injection well, and the flowing channel is used for forming a communication channel on the horizontal section. The invention is mainly used for manufacturing the brine mining well casing pipe.

The invention relates to the technical field of salt well mining, in particular to a screen pipe for salt well brine mining. The screen pipe comprises a center pipe arranged in a salt well intermediate casing. The lower end of the center pipe is connected with a guide cone. A plurality of long-strip-shaped kerfs are formed in the positions, close to the guide cone, of the lower portion of the center pipe. The total area of the kerfs is greater than the cross sectional area of the center pipe. The invention further comprises a using method of the screen pipe for salt well brine mining. The method comprises the following steps that (1) the screen pipe for salt well brine mining is inserted into gravel of a salt ledge of a salt cavern, water is injected when the screen pipe is inserted; and (2) water is injected into an annulus between the screen pipe for salt well brine mining and the intermediate casing, and then brine is extruded out of the screen pipe for salt well brine mining through pressure. By adopting the structure, the kerfs are adopted by the screen pipe for salt well brine mining for replacing small holes. In this way, the width of the kerfs is far smaller than the diameter of the small holes with the same displacement, and the effect of filtering gravel of the screen pipe is obviously improved. Besides, the screen pipe can be inserted more deeply so as to extract brine with the high salt mine grade.

The invention provides a method for pouring calcium magnesium salt mud into a brine well cavity. The method for pouring the calcium magnesium salt mud into the brine well cavity, provided by the invention, comprises the following steps: (1) adding the calcium magnesium salt mud into a stirring barrel to be diluted and stirred; (2) pumping the diluted calcium magnesium salt mud into a neutralizingbarrel, adding condensate water and acid liquid, and adjusting the solid-to-liquid ratio to be not higher than 5%, and the pH value to be within 8.2-8.8; (3), pumping a product obtained in the step (2) into a slag storage barrel, and supplementing with clear water; (4) pouring the product in the slag storage barrel into the brine well cavity for brine mining. According to the invention, the problem of the environment and groundwater pollution during airing, transportation and burying processes of the calcium magnesium salt mud is avoided, so that excellent environmental and social and economicbenefits are obtained.

The invention relates to the technical field of underground brine exploitation. The invention provides a mining method of a brine ore with low porosity, low water yield and low permeability. The mining method is applied to an air-driven brine mining system, the system comprises a brine conveying channel (1), a plurality of parallel brine conveying pipes (2) connected to the brine conveying channel (1), a plurality of brine mining wells (3) connected to each brine conveying pipe (2), a plurality of gas injection holes (4) uniformly distributed in a brine mining area, a plurality of gas conveying pipes (5) for connecting the gas injection holes (4) in series, and an air compressor unit (6). According to the method, the brine mining cost can be reduced, the brine mining amount can be greatly increased, the mining efficiency can be improved, and the recovery rate can be increased when the brine ore of the fine-debris aquifer with low porosity, low specific yield and low permeability is mined.

The invention discloses a method for jointly mining salt through a directional well and a submergence electric pump. The method comprises the following steps that (1) water injection is conducted on asalt cavity of a brine well of a communicating and to-be-mined salt bed; (2) the stability area nearby the salt cavity of the brine well is determined; (3) the directional well is drilled on the stability area, and the directional well communicates with the salt cavity; and (4) the electric submergence pump is down into the directional well, and brine in the salt cavity is extracted. According tothe method for jointly mining the salt through the directional well and the submergence electric pump, the pressure in the salt cavity is obviously lower than that of a water-lift brine mining technology, etching and damage of injected water to surrounding rock are slowed down, meanwhile, the directional well and brine extracting equipment are located in the stability area, production is stable,and the brine quality is good; and the method is safe, the production period is long, salt mine falling off from the interior of the salt cavity can be dissolved and recovered, the method can be usedin a well group which loses the airtight condition, and the recovery ratio of the salt mine is effectively increased.

The invention discloses a method for determining an air-driven distance in an air-driven brine mining method. The method comprises the following steps that S1, a brine collecting channel is excavated;S2, two grouting drill hole sets with a certain interval are arranged on the same side perpendicular to the brine collecting channel in parallel, each grouting drill hole set is composed of a plurality of grouting drill holes with a certain interval, a cementing material is injected into a brine storage layer through the grouting drill holes by means of a grouting pump, pores of part of the brinestorage layer are filled with the cementing material, and thus a waterproof columnar body is formed; S3, a continuously closed curtain wall is formed; S4, a gas injection drilling set is constructedat the end, away from the brine collecting channel, of the curtain wall perpendicular to the curtain wall formed by the two grouting drill hole sets, and air is injected into the brine storage layer through a gas injection device; and S5, the brine amount of the brine collecting channel is monitored in real time, and the length of the grouting drill hole sets and the distance between the gas injection drill holes and the brine collecting channel are adjusted. The step 5 is repeated until the most suitable air-driven distance of the brine storage layer is determined. The method can greatly improve the collection efficiency.

The invention provides a resource recycling method of chlor-alkali wastewater, and belongs to the technical field of wastewater treatment. The method comprises the following steps: adjusting the pH value of the chlor-alkali wastewater to 6-7, and then mixing the chlor-alkali wastewater with a magnetic mercury adsorbent for adsorption to obtain mercury-removed wastewater and a mercury-magnetic mercury adsorbent; carrying out desorption adsorption on the mercury-magnetic mercury adsorbent to obtain a recovered magnetic mercury adsorbent and a mercury ion solution; sequentially carrying out organic pollutant removal treatment, free chlorine removal and magnesium precipitation reaction on the mercury-removed wastewater to obtain magnesium hydroxide and magnesium-removed wastewater; carrying out calcium precipitation reaction on the magnesium-removed wastewater to obtain calcium carbonate and calcium-removed wastewater; and collecting brine from the calcium-removed wastewater to obtain light salt brine. The mercury ion solution (used for preparing mercury salt), magnesium hydroxide (used as a flame retardant, a neutralizer and a flue gas desulfurizer and used for preparing calcium carbonate and magnesium salt), calcium carbonate (used as a pigment filler, a raw material of optical neodymium glass and flux limestone in metallurgical industry) and light salt brine (used for brine mining) obtained by the method can realize full utilization of resources in chlor-alkali wastewater.

The invention provides a construction method of a gas injection hole. The construction method comprises the following steps that an upper water-resisting layer (7) is penetrated by using a phi 150mm drill bit, then a phi 150mm well cementation sleeve (1) is lowered, and the outer side of the well cementation sleeve (1) is fixed by using a magnesium-based cementing material in an out-of-wall grouting mode to form an out-of-pipe cement body (10); a fine debris water-containing layer (8) is drilled in the well cementation sleeve (1) by using a phi 110mm drill bit, and a lower water-resisting layer (9) is drilled; a drill bit with the diameter phi of 127 mm is drilled into the upper water-resisting layer (7) by the depth of 0.2-1 m in the well cementation sleeve (1), so that a closed steel ring (24) of a gas injection screen pipe (2) is embedded into the upper water-resisting layer (7); and the processed gas injection screen pipe (2) is put into the well cementation sleeve (1), and then amagnesium-based cementing material is poured to form an in-of-pipe cement body and enable the in-of-pipe cement body (11) to be cemented and fixed with the well cementation sleeve (1). According to the construction method of the gas injection hole, air with certain pressure can be injected into the water-containing layer, so that pore brine of the water-containing layer is rapidly discharged, thebrine mining cost can be reduced, the brine mining amount is greatly increased, and the mining efficiency and the recovery ratio are improved.

The present invention relates to a brine mining process. The process incorporates a forward osmosis step wherein at least a portion of at least one process stream is provided to at least one forward osmosis unit. The process thus allows for the use of multiple sources, and qualities, of water, which, in turn, can reduce the reliance on natural water sources. Longevity of the mining, and any downstream, process equipment may be enhanced. At least a portion of the production stream may also be fed to a downstream process, such as a chlor-alkali process.