318 results about "Geochemistry" patented technology

A method of generating and recovering gas from naturally existing subsurface formations Of coal, carbonaceous shale or organic-rich shales comprising the steps Of: injecting into fracture of the subsurface formation, under substantially anaerobic conditions, a consortia of selected anaerobic, biological microorganisms for in situ conversion of organic compounds in said formation into methane and other compounds; and producing methane through at least one well extending from said subsurface formation to the surfaces.

Liquefied natural gas is used as a fracturing fluid to stimulate production of hydrocarbons from and / or injectability of fluids into subterranean formations. Proppants may be blended with the LNG prior to pumping the liquefied natural gas into the well. Optionally, the liquefied natural gas is heated after it is pumped and before it is introduced into the subterranean formation.

This invention relates to the coal mining field, specifically, to an integrated experimental system of hydrofracturing, water jet slotting, seepage and gas displacement under true triaxial stress. This invention consists of true triaxial stress loading experimental framework, a loading system and a monitoring system. Under true triaxial stress, experiments can be conducted with sample size as large as of 500 mm×500 mm×500 mm. The hydrofracturing experiment can be controlled by as many as 5 independent boreholes at the same time. The borehole water pressure in hydraulic fracturing can reach 63 MPa. Experiments of seepage and fluid-structure interaction with high seepage pressure can be achieved with sample dimension as large as 400 mm×400 mm×400 mm. Mine-used experimental bench of high pressure pump with rated flow of 70 L / min and maximum water pressure of 70 MPa can be used to drill borehole and the like.

The present invention relates to subterranean treatment operations. More particularly, the present invention relates to improved treatment fluids and methods of using such improved treatment fluids in subterranean formations. An example of a method of the present invention is a method of treating a subterranean formation. Another example of a method of the present invention is a method of drilling in a subterranean formation. Another example of a method of the present invention is a method of degrading a filter cake in a subterranean formation. An example of a composition of the present invention is a treatment fluid comprising a degradable diverting agent. Another example of a composition of the present invention is a degradable diverting agent for use in a subterranean treatment fluid.

The present invention relates to subterranean treatment operations, and more particularly to improved bridging agents comprising a degradable material, improved subterranean treatment fluids comprising such improved bridging agents, and methods of using such improved subterranean treatment fluids in subterranean formations. An example of a method of the present invention is a method of drilling a well bore in a subterranean formation. Another example of a method of the present invention is a method of forming a self-degrading filter cake in a subterranean formation. Another example of a method of the present invention is a method of degrading a filter cake in a subterranean formation. An example of a composition of the present invention is a treatment fluid including a viscosifier, a fluid loss control additive, and a bridging agent comprising a degradable material. Another example of a composition of the present invention is a bridging agent comprising a degradable material.

One or more subterranean zones are isolated from one or more other subterranean zones using a combination of solid tubulars and perforated tubulars.

A method for evaluating an earth formation from a well bore, that includes: collecting at least one of geochemical data, petrophysical data and geomechanical data from a wellbore; and identifying depositional facies of the earth surrounding the wellbore. A computer program product and a system are provided.

The invention relates to a shale gas resource / reserve measurement method. The method comprises the following steps: (1) determining a shale gas resource / reserve calculation unit; (2) identifying a shale stratum according to the shale gas resource / reserve calculation unit determined in the step (1); (3) determining shale gas resource / reserve parameters of the shale stratum; and (4) calculating the shale gas resource / reserve of the shale stratum according to the shale gas resource / reserve parameters of the shale stratum, which are determined in the step (3). The shale gas resource / reserve measurement method provided by the invention has strong feasibility and reliability, and can calculate the shale gas resource / reserve of different exploration areas in all exploration periods, thereby finding out the resource potential and economic benefits of the exploration areas.

Presented herein are improved bridging agents comprising a degradable material, improved subterranean treatment fluids comprising such improved bridging agents, and methods of using such improved subterranean treatment fluids in subterranean formations. An example of a method presented is a method of drilling a well bore in a subterranean formation. Another example of a method presented is a method of forming a self-degrading filter cake in a subterranean formation. Another example of a method presented is a method of degrading a filter cake in a subterranean formation. An example of a composition of the present invention is a treatment fluid including a viscosifier, a fluid loss control additive, and a bridging agent comprising a degradable material. Another example of a composition presented is a bridging agent comprising a degradable material.

The invention belongs to the field of geological exploration and particularly relates to a rapid prospecting positioning method applicable to a hidden sandstone-type uranium mine. By means of the rapid prospecting positioning method, a minerogenic prospect of the hidden sandstone-type uranium mine can be found optimally, efficiently, rapidly and accurately. The rapid prospecting positioning method comprises the steps of finding a favorable uranium metallogenic province band preliminarily; measuring and acquiring a concentration value of radon gas, shallow earthquake data and electromagnetic data; determining a favorable target position; drawing abnormal profile maps and planar contour diagrams of radon gas data and electromagnetic data; performing mineral occurrence projection transformation; establishing a geophysical-geochemical abnormal model and finding an oxidation-reduction transitional zone predicting area; finding oxidation-reduction zone predicting areas in different positions; judging double-overlapped areas of a radon gas abnormal area and a magnetic abnormal area to be a favorable metallogenic prospect target region. The rapid prospecting positioning method based on combination of specific geological and geophysical-geochemical methods is strong in operability and high in evaluation efficiency, research results have objectivity, and therefore, the rapid prospecting positioning method has significant theoretical importance and practical meaning in deepening prospecting methods of the hidden sandstone-type uranium mine and expanding uranium resources in China.

The present invention provides improved drilling fluids that comprise improved shale inhibiting components, and methods for using these drilling fluids in connection with drilling in a subterranean formation. The drilling fluids comprise water and an improved shale inhibiting component. Optionally, other additives may be added to the drilling fluids of the present invention, including, inter alia, antifoams, biocides, bridging agents, corrosion control agents, dispersants, flocculants, fluid loss additives, foamers, H2S scavengers, lubricants, oxygen scavengers, salts, scale inhibitors, viscosifiers, and weighting agents.

The invention discloses a test method of a drill hole gas extraction effective radius. The test method of the drill hole gas extraction effective radius comprises the following steps: selecting a sulfur hexafluoride (SF6) gas trace method to conduct spot test, under the condition of testing different pitches, sampling and collecting the SF6 gas required time which is detected by a detection hole, establishing a module at the basis of the Darcy law based on the occurrence of coal seam condition of the detecting location, simulating the flowing condition of the SF6 gas in a gas seepage field; calculating and obtaining the required time Ti'of the SF6 gas which moves to a sampling and collecting test hole, calculating a sampling and collecting effective coefficient a; detecting the required time of the SF6 gas based on the sampling and collecting detection hole detected by the SF6 gas trace method, calculating the required time which lowers the relative distance gas pressure below an effective value, and calculating the drill hole gas extraction effective radius based on power function relation between drill hole sampling and collecting gas effective extraction effective radius r (m) and the sampling and collecting time t (d). The test method of the drill hole gas extraction effective radius adopts combination of a direct method and an indirect method, and solves the problems that a plurality of defects exist by using the direct method to detect a drill hole gas extraction radius and extraction effective index is difficult to ascertain.

The invention discloses a shale organic porosity detection method, and belongs to the technical field of petroleum, geology and mining exploration and development. The shale organic porosity detection method comprises the steps of calculating chemical kinetic parameters of petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis by utilizing a chemical kinetic method based on the thermal simulation experiment of a shale sample and a crude oil sample with representativeness, and determining the conversion rate of the petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis of shale at the study layer section by combining with the burial history and thermal history of a target layer; recovering the original hydrogen index and the original organic carbon of shale of the target layer by utilizing residual hydrogen index and data of residual organic carbon of shale of the target layer and combining with the conversion rate of the petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis; analyzing the organic pore compressibility of shale by utilizing a Ar ion polishing thin sheet of a shale sample of the target layer; calculating the organic porosity of the shale sample of the target layer section. The shale organic porosity detection method has the effects that the organic porosity of the reservoir of shale can be calculated, and the shale organic porosity detection method is high in calculation accuracy, and is easy to operate.

The invention belongs to the technical field of uranium ore geological research, and particularly discloses a sandstone uranium ore comprehensive evaluation technology method. The method comprises thefollowing steps of 1, determining a uranium ore-forming favorable geological background and an ore-forming environment; 2, determining depositional subfacies or microfacies and spatial distribution of an ore-finding target layer; 3, identifying and locating a uranium ore-forming favorable sand body; 4, comprehensively extracting ore-forming favorable information; and 5, delineating an ore-formingfavorable region, and comprehensively evaluating ore-forming potential. According to the method, the steps are irreversibly carried out in sequence, and the uranium ore-forming potential of a regioncan be efficiently, quickly and objectively; uranium geological background and ore-forming environment analysis is a principal factor, wherein uranium source condition analysis is a top priority, andif the region does not have a uranium source condition, uranium ore does not exist no matter how good other conditions are; and by analyzing the ore-forming geological background and the ore-forming environment, favorable ore-forming geological conditions are determined.

The invention discloses a method for integrally sealing and separating a gas extraction drilled hole in a coal seam, and in particular is applied to sealing of a gas extraction drilled hole in the coal seam and gas extraction drilled holes in the adjacent coal seams. The method comprises the following steps of: forming a sealing space in the drilled hole by filling sealing materials; extracting high-concentration gas in an initial drilled hole by using an extraction pipeline; sealing the extraction drilled hole by using materials such as accelerated cement; and when the concentration of gas to be extracted is reduced to a relatively low level, spraying the surface of a laneway surrounding a drilling site by using sealing and separating materials, and forming a low-permeability separating layer serving as a connection channel for separating inner cracks and external air on the surface of the laneway so as to seal the extraction drilled hole. By the method, air leakage channel can be effectively sealed in the gas extraction process, and a phenomenon that air enters is avoided, so that the concentration of the gas in the extraction drilled hole is greatly increased, and the service life of the gas extraction drilled hole in the coal layer is prolonged.

A method for measuring one or more characteristics of an earth formation wherebyenergy is emitted circumferentially about a borehole into the formation, and the amount reflected back is detected during a plurality of sample periods. The samples are grouped into two or more groups by the azimuthal sector in which the sample was collected. Within a group, each sample is mathematically weighted according to the standoff of the detector from the borehole wall when the sample was taken. Within a group, the weighted samples are summed to produce a weighted total amount of energy detected within a sector. The weighted total is then transformed into the one or more characteristics.

A composition including triethylenetetramine and aminoethylpiperazine is used as a clay inhibitor in water-based drilling fluids and in hydraulic fracturing fluids for drilling wells and for fracturing subterranean formations, and is also used as a clay inhibitor in other treatment fluids for treating wells or subterranean formations.

Hydrocarbon containing formations can be processed using an in-situ liquefaction technique. This new technique embodies systematic temperature elevation applied to subsurface formation allowing recoverable hydrocarbons to reach a Newtonian fluid viscosity suitable for extraction.

The invention relates to a method for using X-ray fluorescence to analyze the extent of porosity of terrigenous clasolite in oil drilling; the method comprises the following steps of: adopting an energy dispersion-typed X-ray fluorescence analyzer to carry out continuous analysis to the chemical elements in the rock core and rock debris in the oil drilling field with the drilling depth; obtaining the analysis data of the X-ray fluorescence changing with the depth; selecting silicon and ferrum elements which have obvious positive and negative relationship with the reservoir property of the rock; using the data of the silicon and ferrum elements to carry out 0-1 normalization data calculation; then calculating the extent of porosity; finally mapping the curve of the extent of porosity; and evaluating the reservoir property according to the curve of the extent of porosity and the value of the extent of porosity. The method of the invention can carry out X-ray fluorescence analysis and the analysis of the extent of porosity of the terrigenous clasolite in real time, use the data of the extent of porosity in real time to carry out quantitative evaluation to the reservoir property of the rock, form a geology explanation and evaluation method with the drilling based on the analysis of the X-ray fluorescence and guide exploration and development practice of oil and natural gas accurately and effectively.

System for drilling boreholes into subsurface formations. A gyrotron injects millimeter-wave radiation energy into the borehole and pressurization apparatus is provided for pressurizing the borehole whereby a thermal melt front at the end of the borehole propagates into the subsurface formations. In another aspect, a system for fracturing a subsurface formation is disclosed.

The invention discloses a ground bored well body structure for gas extraction, comprising a surface layer section, a rock stratum section and a pressure relief extraction section, wherein the well body aperture of the surface layer section is gradually reduced, and the surface layer section is positioned from the ground to a bedding rock stratum; the rock stratum section is positioned between thesurface layer section and the pressure relief extraction section; the pressure relief extraction section is positioned between the upper side of an upper-group pressure relief coal bed top plate and alower-group extraction coal bed, and the lower end of the pressure relief extraction section is 10-30 m away from a lower-group extraction coal bed top plate; the surface layer section is provided with a surface layer sleeve pipe; the rock stratum section is provided with a rock stratum sleeve pipe; an extraction gas pipe extends to the ground from a well bottom, and a pipe section of the extraction gas pipe, which penetrates through an upper-group pressure relief coal bed is an extraction gas screen pipe, other pipe sections of the extraction gas pipe are extraction gas solid pipes, and theextraction gas screen pipe is wound with lead wires; and spacings are retained between the extraction gas pipe and the surface layer sleeve pipe and between the rock stratum sleeve pipe and the well wall of the pressure relief extraction section. The ground bored well body structure is stable and difficult to break and block, has good gas extraction effect and wide applied range and is suitable for a ground bored well of a coal mine, which is used for extracting gas.

The present invention discloses a shale gas single well geological comprehensive evaluation method. The method comprises the following steps: stratigraphic division and comparison and sedimentary facies analysis; shale gas reservoir forming condition and main controlling factor analysis; shale fragility analysis; evaluation grading according to a shale gas selection region evaluation parameter table suitable for exploration and development of a research region; and finally, optimization of the layer segments of profitability and the ranges of profitability. Through adoption of the technical scheme, the shale gas single well geological comprehensive evaluation method can objectively and roundly evaluate the shale gas single well geological condition and can provide detailed reference data for well exploitation and geological evaluation of adjacent shale gas single wells and shale gas regions in the later period so as to break the limitation of the current evaluation method, define the shale gas single well geological comprehensive condition and avoid unnecessary waste.