423 results about "Pellets" patented technology

The present invention provides time released markers for use with single reservoir and commingled wells. The invention accomplishes the time release of markers by coating or encapsulating marker particles or by coating a proppant which has been saturated with a marker. After coating or encapsulation, the marker is injected into a well as is known in the art. The marker remains in the well. The marker is released after an elapsed of time. The elapsed time can be in a wide range. After the elapsed time, production is taken from the well and tested for the presence of the marker. Various types of known analyses can be performed to test for the presence and concentration of the marker in the production fluid. The concentration of the marker in the production fluid allows the apportioning of production from the reservoir. In addition, different markers may be added to each zone within a reservoir where each marker has a different elapsed time increment. The zones can be any different layer or area in the reservoir such as different strata or layer of rock, limestone or sand. Differing marker combinations allow contribution from different zones to be monitored over an extended time.

The invention provides a method of utilizing nanometer silicon dioxide to improve properties of water-based drilling fluid at different temperatures. The method comprises a step of adding a nanometer silicon dioxide dispersing agent into base mud, wherein the mass of the nanometer silicon dioxide particle in the nanometer silicon dioxide dispersing agent is 5-10% of total mass of the base mud and the nanometer silicon dioxide dispersing agent. Due to the nano-scale particle size, the nanometer silicon dioxide material can be filled into small holes and cracks of the shale stratum to improve the plugging effect of the water-based drilling fluid, slow down the trend of permeation of the drilling fluid to the stratum and expansion and chipping of the stratum after water absorption, and improve the stability of the borehole wall. The nanometer silicon dioxide can strengthen the stability of fresh-water base mud and bentonite base mud by increasing the negative charge level of the system. The nanometer silicon dioxide also can enable the base mud to form thinner and compact mud cakes and facilitate the de-filtration effect to be obvious.

The present invention includes compositions and methods for improving wellbores stability of a hydrocarbon bearing shale formation using nanoparticles to decrease swelling and plug pore throats.

The invention discloses a carbonate rock structure ingredient well logging quantitative recognition method and a purpose thereof. The method mainly comprises three parts including porosity and water saturation well logging calculation, rock structure number parameter calculation and rock structure ingredient identification. When RFN obtained through calculation is smaller than 0.3, the structure is a micrite structure; when the RFN is between 0.3 and 1.1, the structure is a powder crystal structure; when the RFN is greater than 1.1, the structure is a fine crystal or particle structure. The sound wave time difference logging curve is adopted for calculating the porosity, the deep lateral resistivity well logging curve and the porosity are utilized for calculating the stratum water content saturability, a rock structure number formula is utilized for calculating the rock structure number parameter, and different rock structure ingredients are identified through cutoff values. The method provided by the invention is practically applied to the stratum of Majiagou formation of Ordovician system in Wuqinan region of Ordos Basin, and a better effect is obtained.

According to a first embodiment, the invention relates to a separating device for removing sand and rock particles in the extraction of liquids or gases from wells drilled in rock, comprising a plurality of annular discs of a brittle-hard material stacked one on top of the other and axially braced by means of a supporting structure, the discs having on their upper side at least three spacers uniformly distributed over the circular circumference of the discs, the discs being stacked one on top of the other in such a way that the spacers respectively lie one over the other, and that a separating gap with a height of 0.05-1 mm, preferably 0.2-0.5 mm, is present in each case between the individual discs.

According to a second embodiment, the invention relates to a separating device for removing sand and rock particles in the extraction of liquids or gases from wells drilled in rock, comprising a plurality of bush-shaped elements of a brittle-hard material stacked one on top of the other and axially braced by means of a supporting structure, slits with a slit width of 0.05-1 mm, preferably 0.2-0.5 mm, being formed in the bush-shaped elements.

Methods and apparatus provide for the characterization of injected fluid flow within a wellbore. Particular embodiments include injecting a slurry comprising a particulate material and a carrier fluid into an isolated wellbore annulus and acquiring composite density readings at one or more discrete locations along the annulus while depositing the particulate material. Interpreting the acquired composite density readings provides an evaluation of the placement of the deposited particulate material within the isolated wellbore annulus. A further step may include determining when the slurry reaches each of the discrete locations as indicated by increases in the composite density reading at each of the discrete locations and furthermore, acquiring a maximum composite density reading at each of the discrete locations along the tubular member as an indication of the quantity of deposited particulate material at each of the discrete locations. Apparatus includes a plurality of densimeters secured at discrete axial locations within a tubular member for acquiring composite density readings within an isolated wellbore annulus.

The invention discloses a rock particle three-dimensional geometrical morphology information extraction system and a rock particle three-dimensional geometrical morphology information extraction method. The rock particle three-dimensional geometrical morphology information extraction method comprises the steps of: photographing a plurality of feature images of each surface of a rock particle at different height visual angles from a plurality of visual angles at different heights, so as to obtain all feature points of the surface of the rock particle; performing three-dimensional modeling according to the plurality of feature images of each surface of the rock particle at different height visual angles to obtain a three-dimensional model of the rock particle; and extracting contour information of the rock particle from the three-dimensional model, and further calculating three-dimensional geometrical morphology information of the rock particle according to the contour information. Compared with the prior art, the rock particle three-dimensional geometrical morphology information extraction method and the rock particle three-dimensional geometrical morphology information extraction system have the advantages that the precision of the three-dimensional model of the rock particle acquired by the method and the system is higher, and the local three-dimensional geometrical morphologyinformation of the rock particle can be acquired.

Methods of hydraulic fracturing are disclosed. One method of hydraulic fracturing which is performed on a geologic stratum includes using a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in a fracturing fluid. A material for use in hydraulic fracturing may include a fracturing fluid and a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in the fracturing fluid.

The invention relates to the field of metallurgical technology, in particular to a metallurgical auxiliary material fluxing agent which is characterized in that the melting point of the fluxing agent is 1100 DEG C-1150 DEG C, and the fluxing agent contains, by weight percent, 40-50 Fe2O3, 45-50 CaO, 2.0-6.0 AL2O3, 0-5.0 SiO2 and 0-1.5CaF2. The preparation method is as follows: crushing the compositions to 0-20mm grains, mixing, melting at high temperature of 1200 DEG C -1550 DEG C so as to get calcium ferrite after the melting reaction, cooling and then grinding the calcium ferrite to 200-mesh powder. The fluxing effect can be best when the amount of the fluxing agent added is 4-6% by weight percent of the agglomerate or pellets reduced in a rotary kiln, and after being added, the fluxing agent is mixed with the agglomerate or pellets. The invention has the advantages that: firstly, the fluxing agent not only has fluxing function but also participates in the metallurgical reaction, and secondly, the melting point of the fluxing agent is 1150 EDG C which is lower than that of the fluxing agent of fluorite, so the fluxing agent has better fluxing action to the auxiliary material and is stable in fluxing effect, low in unit and environment-friendly.

A method, apparatus and computer-readable medium for estimating sand production from an earth formation is disclosed. A grain-scale formation model of the earth formation is created, wherein a value obtained from the grain-scale formation model compares to a value of a measured property of the earth formation. A fluid parameter of the grain-scale formation model is determined and a movement of at least one grain of the grain-scale formation model is determined due to the determined fluid parameter. The sand production is estimated from the determined movement of the at least one grain.

The invention relates to a method and system for producing calcium carbide by utilizing limestone. The method comprises the following steps: molding mixture of finely powdered medium and low-rank coal, limestone and adhesive into pellets; layering and pyrolyzing the pellets and massive limestone in a dual-layer revolving bed, putting the pellets below the massive limestone, calcining the massive limestone while catalytically cracking raw gas generated by pyrolyzing the pellets in the lower layer, and calcining and pyrolyzing to obtain high-temperature massive quicklime, oil-gas products and high-temperature active pellets; and insulating the high-temperature massive quicklime and high-temperature active pellets, and feeding into a calcium carbide melting furnace to generate calcium carbide and calcium carbide furnace gas. According to the method and system for producing calcium carbide by utilizing limestone, powdered limestone can be sufficiently utilized, and pyrolysis gas generated by pyrolyzing pellets is catalytically cracked and filtered while the massive limestone is used as a raw material, so that the caking problem of radiant tubes can be solved.

The invention belongs to the technical field of uranium ore mineralization potential evaluation, and particularly discloses an evaluation method suitable for judging a sandstone type uranium ore uranium source in a basin. The evaluation method comprises the steps of: (1) collecting an ore-containing target layer sandstone sample; (2) selecting chippings zircon in the sample to prepare a zircon target; (3) testing the U-Pb isotope and U element content of zircon; (4) acquiring a zircon isotopic age histogram and a zircon U-Pb isotopic age and U content element diagram according to the U-Pb isotope and the U element content; (5) providing a source magmatic rock age range and geographical distribution characteristics for the ore-bearing target stratum sandstone according to the analysis in the step (4); (6) finding out the age range of the detritus zircon with the highest U content and particle number ratio according to the U-Pb isotopic age of the zircon and the U content element diagram, and determining a uranium source in a pre-enrichment stage in combination with the step (5); and (7) determining a uranium source in the mineralization stage according to the steps (5) and (6). Theevaluation method provided by the invention can be used for judging uranium sources in sedimentary diagenetic and mineralization action stages of the ore-bearing target layer.

The invention relates to a dewatering method for bauxite concentrate, and the method is used in the solid-liquid separation processes of a diasporite positive flotation concentrate product. The method comprises the operations such as classification, sedimentation, filtration, etc. The invention is characterized in that the diasporite positive flotation concentrate product is classified by adopting classifying equipment such as a hydraulic cyclone, etc., the classification size is 5 to 50 micrometer; after the classification the coarse concentrate and the fine-sized concentrate undergo the sedimentation and the filtration respectively, and are combined into the final concentrate. The method of the invention is simple and feasible, and can obviously improve the sedimentation and the filtration performances as well as the filter cake moisture of the bauxite concentrate, thereby greatly reducing the energy consumption and the mineral processing cost of the aluminum oxide production.

The invention belongs to the field of mineral and rock materials and in particular relates to a new method for measuring a heat conductivity coefficient of a micro (gram-scale) mineral and rock powder sample in a vacuum environment under variable temperature and variable pressure conditions. The needed volume of the micro powder sample is in a range from 1.0cm<3> to 20.0cm<3> during test. The method is performed under vacuum conditions and comprises the following test steps: (1) performing sample pretreatment, namely preparing the sample into a powder sample with the particle size of not more than 1mm according to own needs, ensuring that the sample is uniformly mixed, and drying the sample before measurement; (2) mounting the sample, namely selecting sample cells of different sizes and volumes according to the sample quantity, putting the pretreated sample and a test probe into the sample cells for fixing, and finally arranging the sample cells in a vacuum cavity of a freezer dryer; and (3) testing the sample, namely vacuumizing the vacuum cavity of the freezer dryer, adjusting the pressure to be in a range from 1Pa to 1.013*10<5>Pa, and adjusting the temperature in the cavity, wherein the adjustable temperature ranges from 190 DEG C below zero to 200 DEG C. After the pressure and temperature reach the specified values, the heat conductivity coefficient value of the sample under specified testing conditions is obtained through operation of thermal conductance meter related software.

The invention relates to a poorly consolidated formation roadway support method and system. The poorly consolidated formation roadway support method and system are suitable for poorly consolidated formation rock in west mining areas, wherein the poorly consolidated formation rock has the disadvantages that strength is low, the consolidation performance is poor and the poorly consolidated formation rock is disintegrated when encountering water; due to the influences of excavation disturbance, the shallow part surrounding rock of a roadway is wide in destruction range within a short period of time, and the phase change phenomenon from rock to gravel particles happens during destruction; stability can hardly be effectively controlled through traditional anchor net support and bolting and grouting reinforcement. The poorly consolidated formation roadway support method includes the steps of firstly, prefabricating a hollow shell, arranging the shell on the surface of the excavated roadway through bolt supporting, and exerting certain pre-tightening force on surrounding rock through anchor rods; secondly, injecting expansibility grout in a filling bag of the hollow shell, exerting pre-tightening force on the surrounding rock through the grout in the solidification process due to the expansion effect, and limiting deformation of the surrounding rock; thirdly, implementing full-fracture-surface grouting and bottom plate concrete pouring. The method is easy to operate and convenient to construct, and is mainly applied to poorly consolidated formation roadway support projects.

The invention discloses a shale classification method and application thereof and a shale lithofacies distribution construction system, and the classification method comprises the steps: dividing to-be-classified shale according to the particle size distribution of particles, and carrying out construction to form a first stratum; on the basis of the constructed and formed first layer, obtaining the contents of siliceous minerals, calcareous minerals and clay minerals in the shale in a targeted mode, forming a second stratum through corresponding division, and constructing a unique non-intersection system of shale classification through division of the first stratum and the second stratum, wherein the siliceous minerals contain no detritus quartz. By means of the design, the technical problems that in the prior art, no matter whether shale classification is conducted purely according to particle sizes or based on three-end-member component classification, classification intersection oroverlapping relations may occur, the reliability of classification results is not enough, and the influence on environment analysis is large are solved.

The invention provides a gas-bearing coal seams U-shaped well drilling and exploiting method, and the method comprises the steps of (1) drilling the straight well of the U-shaped well and conducting cavern completion; (2) drilling the straight well segment of the horizontal well; (3) drilling the horizontal segment of the horizontal well; and (4) perforating and fracturing the horizontal well so as to communicate a multilayer object layer of the gas-bearing coal seams. According to the invention, a non-target reservoir is deflected and the horizontal segment is drilled, like a sandstone or a limestone; a borehole is prevented from collapsing, block is prevented from falling off and the well is prevented from leaking when a target reservoir of gas-bearing coal seams is drilled; drilling efficiency is raised; drilling fluid is prevented from soaking the reservoir of the gas-bearing coal seams for a long time, particularly the coalbed gas layer and the shale gas layer; damage of particles in solid phase and drilling cuttings in the drilling fluid to the reservoir of the gas-bearing coal seams is effectively reduced; by communication between the horizontal segment of U-shaped well and the reservoir of the gas-bearing coal seams by pressing crack in a large scope, exploitation swept area and deflation area are increased; multilayer commingled production of the gas-bearing coal seams is realized; the utilization rate of the gas-bearing coal seams is raised; area well drilling quantity and total cost of well drilling are reduced; and the yield of a single well, exploitation degree and economic benefit are greatly increased.