163 results about "Effective porosity" patented technology

The invention relates to a method and a device for calculating effective porosity of a compact oil storage layer. The method comprises the following steps: preparing a saturate rock sample; performing nuclear magnetic resonance measurement on the saturate rock sample, thereby acquiring T2 point amplitude of the saturate rock sample, nuclear magnetic porosity of the saturate rock sample and total amplitude of T2 spectrum of the saturate rock sample; performing dewatering treatment on the saturate rock sample under an effect of centrifugal force and performing the nuclear magnetic resonance measurement, thereby acquiring the T2 point amplitude of the centrifugal rock sample, the nuclear magnetic porosity of the centrifugal rock sample and the total amplitude of T2 spectrum of the centrifugal rock sample; acquiring the porosity component of the T2 point of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the porosity component of the T2 point of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; acquiring a T2 cut-off value according to the total amplitude of T2 spectrum of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the total amplitude of T2 spectrum of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; utilizing the T2 cut-off value to acquire the valid saturability of the flowing fluid; calculating the effective porosity of the compact oil storage layer according to the valid saturability of the flowing fluid.

The present invention is concerned with a procedure to quantitatively determine both, total and effective porosity of carbonated sedimentary rocks, and is based on the elaboration of molds of the rock pores-structure and on the determination of the volumetric and gravimetric properties of the rock and its mold.

Determination of the effective porosity is achieved by using an original formula, developed by the authors of the present invention.

Additionally, the structure of micro and nanopores in the rock is characterized by scanning electron microscopy (SEM), to identify relevant properties for permeability analyses such as: dimensions, shapes, type of connections, pore-structure patterns and pore throats. These and other parameters are used as indicators of the reservoir production and storage capacity.

A partial least squares (PLS) regression relates spin echo signals with samples having a known parameter such as bound water (BW), clay bound water (CBW), bound volume irreducible (BVI), porosity (PHI) and effective porosity (PHE). The regression defines a predictive model that is validated and can then be applied to spin echo signals of unknown samples to directly give an estimate of the parameter of interest. The unknown samples may include earth formations in which a NMR sensor assembly is conveyed in a borehole.

The invention discloses a method for measuring overburden porosity with water in permeation fluid mechanics experiment. The method comprises the following steps of: adding ambient pressure around the core with known pore volume; injecting the single-phase fluid with known compression coefficients into the core in a saturated manner, and enabling pressure at the two ends of the core to conform to the actual conditions of the stratum; and then, sequentially increasing the ambient pressure, and sequentially measuring the change of pore pressure in the core after the ambient pressure is increased so as to determine the change of pore volume and determine the porosity change under an overburden condition. The measuring method disclosed by the invention is applicable to the overburden porosity research in the field of low-permeability and ultralow-permeability storage layer stress sensitive research; and the method can realize overburden porosity research on rock while simulating the overburden pressure on a real storage layer, pore pressure and real fluid parameters. The test equipment adopted by the method is simple, and the test principle is clear; and compared with the method for measuring overburden porosity with air, the effective porosity measured by the method disclosed by the invention can better reflect the overburden porosity characteristics of the real storage layer, and quantitative research on the overburden porosity of the storage layer can be realized.

The invention discloses an anti-plugging device of a constructed wetland. The anti-plugging device is characterized by comprising a water collection area substrate and a wetland substrate which are distributed in a vertical current constructed wetland from down to up, wherein wetland plants are grown on the wetland substrate; a pneumatic tube is installed in the wetland substrate; the horizontal section of the wetland substrate faces downwardly and provided with an aeration branch pipe in parallel; the end head of the aeration branch pipe is provided with an aeration head, and the aeration head is located in the middle of the wetland in a vertical direction; one end of the pneumatic tube extending out of the wetland substrate is connected with a gas pump and provided with a valve; and the water collection area substrate is made of gravel, and the wetland substrate is made of coarse sand. The air passes through the pneumatic tube by the gas pump and then is output from the aeration branch pipe and the aeration head, so that the convention current is formed between the air and downlink flooding water so as to impact substrate particles, thereby improving effective porosity, inhibiting blockage and ensuring aerobic environment required by activity of wetland microorganisms.

The invention discloses recycled aggregate type permeable ecological concrete and a preparation method thereof. The concrete comprises, by weight, 1350-1450 parts of recycled aggregate, 200-250 parts of recycled fine aggregate, 250-300 parts of cement, 110-130 parts of water and 5-7 parts of admixtures which are stirred and subjected to pouring forming. The formed ecological concrete is provided with pores in crunchy rice candy shapes and communicated continuously, the effective porosity is 12-15%, the compressive strength is 15-20MPa, and the permeation coefficient is 30-50mm/s. According to the concrete and the method, construction solid wastes are used for replacing natural gravels to prepare the recycled aggregate, not only the construction solid wastes are reused, but also utilization of non-renewable resources such as the natural gravels is reduced, the cost of the permeable ecological concrete is reduced, and resource utilization of the construction solid wastes is achieved.

The invention relates to a method and device for rapidly determining the effective porosity of ecological porous concrete. The device comprises a water storage container provided with a water draining pipe, a water injection container provided with a water injection catheter, an extruding and pushing device and a water measuring device. During a determination experiment, a concrete test piece is placed in the water storage container, the extruding and pushing device is used for extruding water in the water injection container from the water injection catheter and injecting the water into the concrete test piece, and the water measuring device is used for collecting water overflowing from the water draining pipe during the determination experiment. Volume of the water is utilized for equivalently replacing the effective pore volume of porous concrete, namely that the water is slowly extruded to the interior of a test mould by virtue of the extruding and pushing device; and when the water level in the test mould is flushed with the top of the test mould, the volume of the water inside the test mould is namely the effective pore volume of the concrete. The experimental device provided by the invention can dynamically control the volume of the water injected into the test mould, can rapidly and accurately determine the effective pore volume, and is significant to monitoring of the plant growth space of the concrete.

The invention relates to a method for grading evaluation of an oil field gas resource, in particular to a method for grading evaluation of a tight sandstone gas resource. The method comprises the specific steps that a tight reservoir sample is collected, porosity and permeability are actually measured, and a water saturation well logging calculation model is built; an effective porosity well logging calculation model is built through the actually-measured porosity; a permeability calculation model is built according to the relation between the actually-measured porosity and the actually-measured permeability; tight sandstone gas stored energy evaluation parameters are created according to well logging calculation data obtained through the previous steps. According to the method for grading evaluation of the tight sandstone gas resource, microscopic features of a tight reservoir are fully utilized, the method for grading evaluation of the resource is established from the perspective of the unconventional hydrocarbon accumulation enrichment characteristic on the basis of changes in pore structures, the stored energy evaluation parameters with the consideration of the hydrocarbon accumulation capacity and the seepage capacity are created, and the scientific and effective method is provided for grading evaluation of the tight sandstone gas resource.

The invention provides a tight reservoir sweetness evaluation method and device. The tight reservoir sweetness evaluation method includes the steps that according to logging information of multiple wells to be detected, the effective thickness, gas saturation, effective porosity and permeability of a reservoir to be detected are acquired, wherein the wells to be detected are formed in the reservoir to be detected; according to the logging information of the wells to be detected, the brittleness index, natural fracture density and mud content of the reservoir to be detected are acquired; the correlation degree of the effective thickness, gas saturation, effective porosity, permeability, brittleness index, natural fracture density and mud content of the reservoir to be detected is acquired; according to the correlation degree, the weight coefficients of the effective thickness, the gas saturation, the effective porosity, the permeability, the brittleness index, the natural fracture density and the mud content are acquired; according to the weight coefficients, the sweetness of the reservoir to be detected is determined. By means of the tight reservoir sweetness evaluation method and device, the geological characteristics of the tight reservoir can be comprehensively analyzed, and the accuracy of tight reservoir sweetness evaluation can be improved.

The invention discloses a testing method for effective pore volume and porosity of a lithium ion battery pole piece. The effective pore volume and porosity of the pole piece is calculated by testing a pore-containing total volume and an actual volume of the pore filled by a liquid, of the pole piece. The testing method is carried out according to the following steps of firstly testing a pore-containing total volume (Vt) of the pole piece and then testing the actual volume (Vz) of the pole piece. The calculation methods for the effective pore volume and the effective porosity are described in the specification. The testing method is in no need of large-scale equipment; the testing device can be manufactured easily; the used reagent is non-toxic and harmless; and the testing method is simple and reliable and is convenient for popularization.

The invention belongs to the technical field of the building material, and relates to a pervious concrete mix proportion design method based on paste membrane thickness. The method comprises the following steps: determining gravels dosage according to gravel natural stacking, determining a paste membrane thickness according to a porosity demand, determining the paste volume by combining the pastemembrane thickness and the gravel total surface area, and determining the dosage of each of the cement, the mineral admixture and the water according to the paste volume, and determining the dosage ofthe water-reducer according to the powder dosage, and comprehensively obtaining the pervious concrete mix proportion at last. The invention provides a paste membrane thickness-based pervious concretemix proportion design method capable of preparing the pervious concrete with controllable effective porosity and excellent comprehensive performance, suitable for promotion and application.

The invention relates to a method for quantitatively evaluating saturation of a complex oil and gas reservoir. A calculation formula of a rock conductive hole porosity is deduced based on a Maxwell conduction equation; and in combination with a result of the electric petrophysical experiment of 12 rock properties, the relationship among cementation indexes and an effective porosity and a conductive hole porosity difference corresponding to the cementation index can be deduced, so that a high-precision calculation model of the cementation index in an Archie equation can be exactly established. According to the method, the relationship between the effective porosity and the conductive hole porosity is established, so that the calculation model of the cementation index can take the conductive hole porosity as a bridge to deduce a universality expression between the cementation index and the effective porosity in the Archie equation; and the method has strong universality, and can comprehensively reflect conductive mechanisms of the complex reservoir. The invention provides an effective method with high precision and strong universality for quantitatively evaluating the saturation of a complex porosity type reservoir by using the Archie equation; and the method can be widely used for quantitatively evaluating the saturation of various complex porosity type reservoirs.

The invention relates to a method for determining an effective porosity of pervious concrete, in which a test process is economic, convenient and rapid, and belongs to the technical field of testing of an effective porosity of pervious concrete. The method is mainly characterized by comprising the following steps: determining mass m1 of each test piece in water, adopting a handheld electronic scale and a mesh bag, putting the test pieces which are soaked for 24 hours into the mesh bag, completely soaking in water, packing up a knot on mesh bag opening, resetting the electronic scale, hooking up the rope knot through a scale hook, observing a fixed display value on scale, i.e., mass m1 of the test pieces and the mesh bag in the water, after being stable, and deducting mass 3 of the mesh bag in the water, so as to obtain mass (m1-m3) of the test pieces in the water. The method disclosed by the invention is simple and convenient to operate; the method has the beneficial effects that an average error therebetween is 1.43%, so that the method meets a precision requirement preset by the test, and the special method can rapidly determine mass of pervious concrete test block in the water in a test room or a construction field, so as to calculate the effective porosity of the pervious concrete test block through a formula; the method not only greatly reduces test equipment cost, but also is convenient and rapid, and is easy to popularize and use.

The invention relates to an effective porosity tester for undisturbed soil. The effective porosity tester comprises a water supply tank, a water head regulation component, a seepage unit, a liquid equal-division unit and a detection unit, wherein a water supply unit is communicated with the seepage unit through the liquid equal-division unit. According to the effective porosity tester for the undisturbed soil, the effective porosity of rock soil can be tested, the effective porosity of an undisturbed soil test sample can be obtained by a solute replacement method, and the seepage unit can be used for sampling the undisturbed soil test sample; the effective porosity tester for the undisturbed soil is simple in structure, higher in effective porosity testing accuracy and good in application potential, and can be used for helping a student to understand a difference between the effective porosity and overall porosity as a teaching apparatus in a laboratory in hydrogeological researches, and a testing process is convenient; during practical production, the effective porosity tester for the undisturbed soil can be used for testing the effective porosity of the test sample, and a parameter testing experimental device is provided for further researches such as seawater infiltration, leakage recharge, submerged transport and in-situ groundwater remediation on solute transport.

An embodiment of the invention discloses a method and a device for determining MOIP (movable oil in place) of crude oil of a tight reservoir. The method includes acquiring first parameters of a core plunger sample of a target stratum, and computing effective porosity, overburden permeability and starting pressure gradient of the target stratum according to the first parameters; acquiring second parameters of the crude oil of the target stratum, and determining the maximum movable radius of the crude oil according to the overburden permeability, the starting pressure gradient and the second parameters of the target stratum; determining the lower limit value of the effective porosity radius required for flowing of the crude oil according to the overburden permeability, and determining effective movable-in-place ratio according to the lower limit value of the effective porosity radius; determining the MOIP of the target stratum according to the effective porosity, the second parameters, the maximum movable radius of the crude oil and the movable-in-place ratio of the target stratum. By the method and the device for determining MOIP of the crude oil of the target reservoir, the recoverable reserve of the crude oil of the tight reservoir in the target stratum in a research area can be accurately computed.

The invention relates to a method for predicting the geological reserve of an oil reservoir, and relates to the technical field of oil exploration. The method includes the following steps that 1, in computing element division, wherein based on the planar distribution and features of the oil reservoir, reserve computing units are divided longitudinally from bottom to top; 2, in data recording, wherein based on well drilling, oil testing and well logging work of the same layer of an adjacent region, data is recorded, the type of the oil reservoir is cleared, and an oil layer division standard, asingle well effective thickness, a ground crude oil density, an effective porosity and oil saturation are determined; 3, reserve calculation is performed. With the method for predicting the geological reserve of the oil reservoir, the contradiction of an oil-water relation can be solved after a development well is implemented, through fine research on all reserve parameters, the calculation errors of the geological reserve of the oil reservoir can be reduced as many as possible, and the method has a better guiding effect when an oil reservoir development scheme is adjusted.

The invention provides an oil layer recognition method based on a tight reservoir conductive factor experiment. The method comprises the steps of 1, obtaining horizontal rock cores of different depths of a reservoir; 2, obtaining the porosity and permeability of the horizontal rock cores, and calculating quality indexes; 3, measuring the specific resistance of the horizontal rock cores and the specific resistance of saturated salt water, and obtaining formation factors; 4, conducting nuclear magnetic resonance measurement to obtain a T2 spectrum, the total porosity, the effective porosity and the irreducible water saturation; 5, conducting an X diffraction and casting body thin section experiment; 6, according to the measurement and experiment results, building the relevant relationship between the formation factors and factors comprising the total porosity, the effective porosity, the pore throat size, distribution, connectivity and the like; 7, on the basis of the built relevant relationship, determining an oil layer recognition algorithm, and conducting oil layer recognition on the reservoir. By utilizing the oil layer recognition method, the reservoir conductive capacity and the factors affecting the reservoir conductive capacity can be analyzed according to tight reservoir experiment data, and the oil layer reservoir algorithm of the tight reservoir is determined according to the analyzed result.

The invention relates to a quantitative evaluation method of a water production rate of a low permeability reservoir. The quantitative evaluation method comprises the following steps of 1) establishing the relation between a water production rate Fw and water saturation Sw of the low permeability reservoir, that is, selecting a nerve cell nonlinear function Sigmoid to express the relation between the water production rate Fw and the water saturation Sw; 2) drilling a core of a low permeability oil field to be developed under one depth, and carrying out a core experiment on the core so as to obtain Fw-Sw relation, formation water resistivity Rw and Archie parameters a, b, m and n; identifying coefficients e, f and g in the relation between the water production rate Fw and the water saturation Sw in the step 1) according to the Fw-Sw relation obtained in the experiment so as to determine a specific Fw-Sw function expression; 3) measuring by utilizing a logging instrument so as to obtain rock resistivity Rt and effective porosity phie of the whole stratum segment of the low permeability oil field, and further figuring out the water saturation Sw of the whole stratum segment; 4) figuring up the water production rate Fw of the whole stratum segment according to the Fw-Sw function expression obtained in the step 2) and the water saturation Sw of the whole stratum segment obtained in the step 3).

The present invention relates to an apparatus and method of measuring effective porosity of various media such as rock or soil using radon that is an inert gas. An apparatus of measuring porosity according to the present invention includes: a gas component detector having two ports and configured to measure a concentration of a predetermined gas; a gas vessel having two ports and configured to accommodate the predetermined gas; a medium vessel having two ports and configured to accommodate a medium, of which the porosity is desirous to be measured; pipe lines connecting the ports of the gas component detector, the gas vessel and the medium vessel; and valves installed on the pipe lines.

The invention discloses a nuclear magnetic resonance laboratory measuring method for heavy oil and asphaltene cores and belongs to the technical field of automatic control. The method comprises: firstly, measuring the nuclear magnetic resonance attenuation signals of a core in a dry state, a core in a saturated brine state, and a core in a centrifugal state, secondly, obtaining the T2 distributionspectrum of cores in each state by inversion; thirdly, obtaining the corrected T2 distribution spectrum through the difference spectrum processing; further, obtaining a T2 distribution cumulative curve of a core in the saturated brine state and a T2 distribution cumulative curve of a core in the centrifugal state; obtaining total porosity, effective porosity, bound water saturation, and T2 cutoffvalue by calculating the above results. The calculated results are more realistic and accurate, and eliminate the influence of nuclear magnetic resonance attenuation signals in the dry state. The method is specially designed for unconventional cores containing heavy oil and asphaltenes, and has broad application prospects in the field of unconventional oil and gas nuclear magnetic logging.

The present invention discloses a method for heavy oil cold flow production. The utilization of said method can greatly reduce cost of heavy oil production. Said invention is implemented by utilizing the following technical scheme: according to acid value of heavy oil, viscosity of crude oil at 50 deg.C, setting point, wax content, colloid asphalt content and core intersection, effective porosity and permeability, after the utilized alkaline water-soluble visbreaking agent is squeezed into the reservoir, according to design requirements downwards-placing screw pump whose specific tight fit is 0.1-0.4 mm and tightness between the stator and rotor of general ground driven screw pump is less than 0.01-0.05 mm, anchoring oil pipe and utilizing different chemicals to reduce resistance and break viscosity so as to implement cold flow production of heavy oil.