35results about How to "Fully exploited" patented technology

The invention relates to an application of a non-coal pillar roadway layout in the under-protected stratum exploitation. The non-coal pillar roadway layout comprises a stagger arrangement or gob-side entry driving roadway layout, the non-coal pillar roadway layout is adopted in the under-protected stratum exploitation of a dynamic disaster coal stratum, and a coal pillar supporting overlying strata between adjacent work surfaces is removed, so the inclined continuous recovery of a stope is realized; and a fracture zone above the stope ascends and the arrangement of the protected coal stratum in the fracture zone descends with the increase of the exploitation range, so the application range of the under-protected stratum exploitation is widened, the mining is full, the destressing effect is obvious, and the protected stratum is not influenced by the installation of the coal pillar in the protected stratum, thereby the safe and economic exploitation of the protected stratum is realized.

The invention discloses a multi-branch gas hydrate replacement mining method. By drilling and producing production wells in the horizontal direction in the hydrate reservoir, repeated consumption of a large amount of resources to penetrate the dense overlying layer of the hydrate is avoided, and the initial mining is utilized. The depressurization method is used to reduce the pressure of the horizontal production well, and then use the replacement material to fracturing the horizontal production well and suppress the pressure of the well, so that the replacement material can fully contact and react with the hydrate, and at the same time deflect in the same layer of the horizontal production well. The next horizontal production well can be drilled at the position or the upper layer, and hydrate production can be carried out at other positions while the replacement operation is realized, so that the production and replacement can be carried out at the same time, saving the time and cost required for the replacement operation, so that the vertical depth and plane direction can be multiplied. All layer and branch wells can exist at the same time, and the combination form of branch wells is not limited. It only needs to fully consider the thickness and range of the hydrate reservoir to be exploited, geological characteristics, drilling and production process safety and other factors to effectively realize the hydrate formation of the entire reservoir. replacement mining.

The invention discloses a branch horizontal well mining method based on a starting pressure gradient. The branch horizontal well mining method comprises the following steps: firstly, calculating the theoretical value of the shale gas yield in a branch horizontal well; according to the theoretical value, carrying out the actual production of the branch horizontal well, and drawing a curve graph of the actual daily yield and time of the branch horizontal well; when a jump point occurs in the curve graph, adjusting the production until the jump point does not appear in the curve graph; when accumulated water yield is equal to critical water yield, determining that the branch horizontal well is scrapped. According to the branch horizontal well mining method, by adjusting the production when the jump point occurs, the output water in the horizontal wellbore can be timely carried by shale gas, the harm of the gas and water mixture returning to the bottom of the well is thus reduced and the gathering of the output water on the bottom of the well is reduced, therefore, maintenance charge is reduced, efficiency is high and maintenance cost is saved.

The invention provides a self-adaptive pump stroke adjusting method for an oil well pump of a underground linear motor. The method comprises the following steps that S1, the time T is taken as a period, in the first period T, pump strokes per minute of an oil extraction device is N0, the oil extraction device starts from the second cycle T, the pump strokes per minute of the oil extraction devicein each period T are all up-regulated by a certain amount, and the oil well is evacuated until an oil well is evacuated in the certain period T, when the oil well is evacuated, the pump strokes per minute of the oil extraction device in each period T is recorded as N1, and then the oil extraction device stops mining; S2, when the stop time of the oil extraction device reaches the T1, the oil extraction device is restarted, and the oil extraction device extracts oil with N1 pump strokes per minute, the time length T2 used for evacuating the oil well again is recorded, and then mining of the oilextraction device is stopped; S3, after the stop time of the oil extraction device reaches the T1 again, the oil extraction device is restarted, and the oil extraction device extracts oil with Nnew pump strokes per minute, wherein the Nnew is equal to N1T2 / (T1 + T2 ). The self-adaptive pump stroke adjusting method for the oil well pump of the underground linear motor has the beneficial effects ofsimple in process, high in precision and high in practicability.

A dry bridge exploitation method for express highway lower press coals belongs to a method to maintain an express highway being continuously utilized, maintained and recovered during lower press coals exploitation under the express highway. For an express highway, traditional exploitation methods for express highway lower press coals cannot guarantee vehicles normally running on the highway during the underground exploitation. Meanwhile, the traditional methods might either cause traffic shutdown on an express highway, or result in too much recovery cost or too much waste of coals. The invention can fulfill that, before coal layer exploitation influences an express highway, erecting a large-span dry bridge to substitute the express highway segment in serving vehicles during the exploitation; after the exploitation influences are over, perform recovery for the express highway and dismantle the dry bridge to recovery traffic. Therefore, the scheme can fulfill the following targets of the invention: Provide a dry bridge exploitation method for express highway lower press coals, in order to guarantees normal traffic and traffic safety during exploitation of the underground coals; meanwhile, the invention can considerably lower cost of maintenance, curring and recovery for express highways, and moreover, expand press coal exploitation volume and sufficiently utilize resources..

The invention provides an environment-friendly anti-landslide mining method. The method comprises the following steps: arranging a first layer of top beams on the upper part of a mineral layer, pilingon the lower parts of the first layer of top beams and preparing a first layer of stand columns which upward reach the first layer of top beams; mining the minerals on the lower parts of the first layer of top beams; downward piling on the bottoms of a first layer of mining holes close to the bottoms of the first layer of stand columns, thereby acquiring a second layer of stand columns; preparinga second layer of top beams and pouring the bottoms of the first layer of stand columns and the tops of the second layer of top beams; mining a second layer of minerals on the lower parts of the second layer of top beams; downward pilling on the bottoms of a second layer of mining holes close to the bottoms of the second layer of stand columns, thereby acquiring a third layer of stand columns; preparing a third layer of top beams and pouring the bottoms of the second layer of stand columns and the tops of the third layer of stand columns; mining a third layer of minerals on the lower parts ofthe third layer of top beams; preparing the corresponding layers of stand columns and top beams in turn till mining the bottom layer of minerals. According to the method provided by the invention, the mining rate of minerals is increased, the mining safety is guaranteed and the happening of geological disasters can be prevented.

The invention discloses a branch horizontal well mining method based on a diffusion coefficient. The branch horizontal well mining method comprises the following steps: firstly, calculating the theoretical value of the shale gas yield in a branch horizontal well; according to the theoretical value, carrying out the actual production of the branch horizontal well, and drawing a curve graph of the actual daily yield and time of the branch horizontal well; when a jump point occurs in the curve graph, adjusting the production until the jump point does not appear in the curve graph; when accumulated water yield is equal to critical water yield, confirming that the branch horizontal well is scrapped. According to the branch horizontal well mining method, by adjusting the production when the jump point occurs, the output water in the horizontal wellbore can be timely carried by shale gas, the harm of the gas and water mixture returning to the bottom of the well is thus reduced and the gathering of the output water on the bottom of the well is reduced, therefore, maintenance charge is reduced, efficiency is high and maintenance cost is saved.

The invention discloses a salt mining method using a horizontal branch hole butted well group. The method comprises the following steps: 1) drilling a first vertical well section to a lower salt bed of a salt mine, drilling a first lower horizontal well section to a preset horizontal branch hole target along the lower salt bed after deviation, and forming a first brine well by the first vertical well section and the first lower horizontal well section; 2) putting a casing into the first brine well for well cementation; 3) drilling a second vertical well section to the lower salt layer a set distance from the wellhead of the first brine well, drilling a second horizontal well section along the lower salt layer to the starting point of a preset horizontal branch hole after deviation, and forming a second brine well by the second vertical well section and the second lower horizontal well section; and other steps. By adopting the horizontal branch hole butted well group, the mining effectof multiple pairs of butted wells is achieved by drilling a pair of drilling holes, thereby lowering the drilling development cost to the greatest extent, and improving the mining efficiency effectively at the same time.

The invention discloses a branch horizontal well exploitation method based on fractal dimension. The method is implemented in the specific steps that firstly, the theoretical value of the shale gas yield of a branch horizontal well is calculated; secondly, according to the theoretical value, the branch horizontal well goes into operation according to daily actual yield, a curve chart of the daily actual yield and time of the branch horizontal well is drawn, when trip points appear in the curve chart, the curve chart is adjusted till no trip points appear in the curve chart, and when cumulative water yield is equal to critical water yield, the branch horizontal well is scrapped. Adjustment is conducted after trip points are generated, shale gas can conveniently carry produced water in a horizontal well shaft, damage caused when gas and water mixtures go back to the well bottom is reduced, and accumulation of the produced water at the well bottom is reduced, so that maintenance expenses are reduced, efficiency is high, and maintenance cost is saved.