2923 results about "Shale gas" patented technology

The invention discloses a five-cylinder plunger pump with an integral power end structure. According to the five-cylinder plunger pump, an integral welding structure is adopted for a crankshaft box body and a crosshead box body in a five-cylinder plunger pump power end assembly, so that the structural strength of the power end assembly is higher, the supporting stability is better, and the whole pump vibration can be reduced; the cylinder spacing is 13-14 inches, the bearing area of connecting rods, crossheads and bearing bushes is increased, a guarantee is provided for the output of the high-power of the five-cylinder plunger pump, the high-power five-cylinder plunger pump can effectively solve the problem that the shale gas fracturing well site area is narrow and the required fracturingequipment is relatively large, the use of equipment can be reduced, and the wellsite arrangement is facilitated; the 11-inches long-stroke design can better realize large-displacement operation requirements and improve the operation efficiency; and according to the multi-point supporting design of crankcase bodies, crosshead box bodies and the hydraulic end assembly, the supporting strength of thefive-cylinder plunger pump can be improved, the vibration is reduced, the high-load operation is better guaranteed, and the operation is more stable.

The invention discloses a large-sized high-pressure movable bend structure which comprises a connector, bends and hinging assemblies. The connector and the bend, and the bends are connected by the hinging assemblies. The connector is connected to upstream and downstream equipment. Each hinging assembly comprises a sealing mechanism, a rotating part and a hoop. The sealing mechanism is used for hermetically connecting the connector and the bend, and the bends. The hoop is used for connecting and fixing the connector and the bend, and the bends. The hoop and the connector or the hoop and the bend are connected by the rotating part. The rotating part is a rolling bearing or a sliding bearing. The large-sized high pressure movable bend structure has the beneficial effects that the structure islarger in diameter, flexible to connect, small in size, light in weight and diversified in forming mode, meets the operation demand of high pressure and large displacement of shale gas, lowers the input cost of operation equipment greatly, optimizes the site layout and is connected to the upstream and downstream equipment flexibly.

The invention provides a method for carrying out shale gas reservoir evaluation and finding a dessert area for shale gas exploration and development comprehensively through comprehensive application of rock physics, log data and omnibearing or wide-azimuth three-dimensional seismic data. The method is characterized by analyzing the characteristics of the dessert area in a shale reservoir by applying comprehensive geophysical exploration technologies of laboratory rock geophysical measurement, log data comprehensive analysis, rock physical modeling, vertical seismic section data, omnibearing or wide-azimuth three-dimensional seismic data high precision surface layer comprehensive modeling static correction processing, prestack de-noising processing, amplitude relative fidelity processing, resolution enhancement processing which is carried out by utilizing well constraint and well seismic data to drive ground seismic data, fine excision, iteration velocity analysis, interval velocity field analysis, prestack depth migration processing, high resolution processing, azimuth classification processing, high-precision anisotropy processing, prestack and post-stack data inversion processing, and neural network analysis and the like, and thus gas bearing characteristic prospect of the shale gas reservoir is evaluated accurately and the dessert area for shale gas exploration and development is delineated.

The invention relates to a coiled tubing supercritical CO2 jet fracturing method. The method is used for performing jet fracturing on oil well reservoirs by taking supercritical CO2 as fracturing fluid. By the method, a supercritical CO2 fluid is used as the fracturing fluid to perform the jet fracturing; a supercritical CO2 sand jet perforating hole can reduce system pressure; the pressure needed by fissure extension can be further reduced by the characteristics of low viscosity and high dispersion performance of the supercritical CO2 fluid; most importantly, the supercritical CO2 jet fracturing does not pollute the reservoirs, but the supercritical CO2 can further improve the oil and gas recovery ratio after entering the reservoirs; the return discharge is not needed after the fracturing is completed; when the stage-by-stage jet fracturing is performed by using the coiled tubing, a tube pillar can be lifted or put down without mineshaft pressure relieving, the operation process is reduced and the operation cost is reduced, so that the method is extremely suitable for fracturing modification of unconventional oil-gas reservoirs such as thick oil reservoirs, low permeability and super-low permeability oil-gas reservoirs, shale gas reservoirs, coal bed methane reservoirs and the like of which the effects are low by using the conventional water-based fracturing fluid.

The invention discloses a shale gas reservoir hydraulic fracturing production increasing method, which comprises the following steps: injecting quick water or resistance reducing water under the condition that the stress is greater than the shale bed fracture stress to crack the stratum; injecting a plurality of plugs, temporarily plugging, building pressure in a crack, inducing steering and laying a single layer of supporting agent at the later period; injecting the supporting agent with ultra-low density mixed with chopped fiber at low sand ratio and high pumping displacement; flowing back after closing. A target stratum is pressurized by using the quick water or the resistance reducing water with different construction pumping programs, supplemented by the temporary plugging technology, the in-crack pressure building technology and the filling technology of the supporting agent with ultra-low density, the superposition of multi-point induced stress fields produced in the stratum is promoted to form large-area cut slip artificial netlike cracks, the gas leakage area is expanded, and the single well yield is improved.

The present invention relates to a shale gas reservoir crustal stress logging prediction method based on a rock physics model. According to the method, a shale gas reservoir rock physics model which takes kerogen particles into consideration is established, so as to predict a longitudinal and transverse wave velocity of the logging; based on the above, a maximum and minimum horizontal principal stress and a fracture pressure of the reservoir are calculated; and an accurate stress assessment of a shale gas reservoir is carried out while a transverse wave logging is not provided. The beneficial effects of the invention are that: the rock physics model in line with characteristics of the shale gas reservoir is established to improve precision of the prediction velocity; and based on the rock physical model, the maximum and minimum horizontal principal stress and the fracture pressure are obtained, so that while the measured transverse wave logging data are not provided, the underground stress can be predicted on the basis of a conventional logging curve, and the prediction result is high in accuracy.

The present invention discloses a method for evaluating shale gas reservoirs and searching sweet spot regions, which includes steps as follows: drilling corestone columns with different directions and measuring dynamic and static parameters of the corestone columns after saturation to obtain a transformable relational expression of dynamic and static elasticity modulus, processing physical simulation of anisotropic rocks, and calculating elastic parameters; intersecting to obtain related relationship corresponding to elastic and sensitive parameters or the combination of the elastic and sensitive parameters and parameters of shale gas sweet spot regions, getting and predicating the parameters or parameter combination of the shale gas sweet spot regions; correcting log data to obtain optimal well log; utilizing multi-mineral analysis and corestone test analysis methods to obtain a model and processing in series; inverting three-dimensional high resolution post-stack seismic data; synthesizing obtained various favorable parameters of the shale gas reservoirs and combining the accurate burial depth, thickness, occurrence and planar distribution of the shale gas reservoirs to obtain the gas bearing characteristic prospect of the shale gas reservoirs and outline the sweet spot regions for shale gas exploration and development.

The invention provides an expanded flexible well cementing grout and a preparation method thereof. The grout comprises the following components in parts by weight: 100 parts of cement, 6-14 parts of toughening material, 3-80 parts of reinforcing material, 8-120 parts of density modifier, 0.5-2.5 parts of suspension stabilizer, 20-40 parts of high-temperature stabilizer, 35-100 parts of distilled water, 0.5-2 parts of dispersant, 0.5-4 parts of fluid loss agent, 0.3-4 parts of retarder, 0.1-2 parts of foam inhibitor and 0.1-2 parts of defoamer. The invention further provides a preparation method of the expanded flexible well cementing grout. The grout has good sedimentation stability; and the set cement has the characteristics of micro expansion, high strength and low elasticity modulus, and can avoid the phenomena of micro cracks, micro annuluses, even fracture and the like caused by cement sheaths in subsequent operation of gas storage wells, shale gas wells, dense oil-gas horizontal wells and the like, thus realizing good zonal isolation and providing a technical support for long-term, safe and effective operation of oil-gas wells.

The invention relates to a rock sample detection and data acquisition system. The system can realize elastic parameter test of a rock sample in the state of gas adsorption; in the system, a three-shaft pressure cabin is connected with a gas supply and metering control device for absorbing samples in the cabin and accurately metering absorption quantity, moreover, an ultrasonic transducer is installed on a cap of the (high) pressure cabin and integrated with an ultrasonic wave transmitting/receiving device so that the test of elastic parameters of methane absorption on coal can be realized truly. The system can automatically and continuously test in the processes of gas absorption and gas enrichment, thereby ensuring a consistent test environment, acquiring an absorption quantity and elastic parameter relation curve, improving test accuracy and efficiency and saving test time and cost. The rock sample detection and data acquisition system integrates methane enrichment mechanism simulation and rock physical property test, can be applied to seismic prospecting method research on coalbed methane and shale gas, mine advanced detection, coal mine safety research and the like.

The invention belongs to the field of fluid mineral product exploration such as petroleum, natural gas and shale gas, and provides a self-suspended propping agent which is prepared by wrapping or partially wrapping a granular framework with a water-soluble high polymer material; the framework consists of solid granules which are sufficient in mechanical strength for bearing crack closing stress and are selected from one or multiple of quartz sand, ceramsite, metal granules, spherical glass granules, sintered monohydrallite, sintered alumina, sintered zirconium oxide, synthetic resin, precoated sand and crushed fruit shell granules; the amount of the water-soluble high polymer material accounts for 0.1-5wt% of that of the framework. The self-suspended propping agent provided by the invention does not need to be fractured by using fracturing fluid which is added with organic macromolecules and is high in cost, and can be fractured by using natural water which can be obtained at any place directly, so that pollution is reduced, and the cost can be lowered. By adopting the self-suspended propping agent provided by the invention, friction resistance of the fracturing fluid can be reduced, and a fracturing support system adopting the self-suspended propping agent has properties which are generally identical to those of conventional fracturing fluid, and is easy to convey and discharge backwards.

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 an experimental device in the field of natural gas recovery, and particularly relates to a shale gas reservoir recovery simulation experimental device. The shale gas reservoir recovery simulation experimental device comprises a high-pressure gas source system, an injection system, a model system, a thermostat system, a pressure return system and a data acquisition system, wherein an intermediate container in the injection system and a core holding unit in the model system are positioned in a thermostat. The shale gas reservoir recovery simulation experimental device has the advantages that a plate model core clamping device and two full-diameter core clamping devices are connected, the cores of different dimensions are connected in series, multi-scale pore characteristics in the shale gas reservoir can be simulated, the multi-scale characteristics of shale gas seepage influenced by the multi-scale effect are reflected, the recovery process of the shale gas reservoir can be accurately simulated, and recovery mechanisms and recovery dynamics of the shale gas reservoir in different modes can be comprehensively evaluated; and meanwhile, a large-scale shale core adsorption/desorption experiment can be performed by utilizing the experimental device, and a gas adsorption/desorption rule of the large-scale shale core under different conditions is researched.

The invention discloses a method for evaluating compressibility of a shale gas reservoir. The method sequentially comprises the following steps of (1) calculating a shale brittleness index Brit, (2), calculating a shale fracture toughness index Kn, (3), calculating a natural weak plane opening facility index Pn, (4), calculating a natural weak plane penetrated index Cn, (5), introducing a complex seam net probability index Fcf and a transforming volume probability index Fsrv, and determining a reservoir compressibility index FI, (6), according to the size of the reservoir compressibility index FI, evaluating the compressibility of a block shale reservoir. According to the method, various compressibility influence factors are considered, and particularly on the basis of a seam net forming mechanism, the influence of the natural weak plane is fully considered; the shortcomings of an existing evaluation method are overcome, and logging data are utilized for calculating brittleness and breaking toughness of the shale gas reservoir; and the dependency on experimental data is reduced. The method is used for evaluating the reservoir quality of a fractured well, has feasibility and accuracy and provides a new decision making method for facture well selecting and layer selecting of the shale gas reservoir.

The invention discloses a testing device and a measuring and calculating method for the gas permeability of compact rock material. Under the condition that the gas pressure at two ends of a rock sample are controlled to be the same, a gas pressure pulse is applied to the lower surface of the rock sample by a gas pressure control panel. When gas penetrates through the rock sample and enters a known pressure air storage tank under the action of the pressure of the pulse, the gas permeability of the rock sample is calculated by recording the change of the pressure of the pulse with time. The testing device and the measuring and calculating method are applicable to the measurement of permeability of mediums with low permeability, such as the storage of underground petroleum and natural gas, the storage of CO2, the disposal of nuclear waste, the storage of shale gas and the like and the measurement and calculation of the permeability of other compact rock mediums. Materials the permeability of mediums is between around 10-24m2 can all be measured and calculated by the device system.

The invention relates to a water-based drilling fluid of a shale gas horizontal well reinforced well wall and an application thereof. The water-based drilling fluid comprises, by weight, 100 parts of water, 0-5 parts of clay, 0.5-3 parts of micro-nano particle blocking agents, 0.5-3 parts of chemical blocking agents, 0.1-2 parts of tackifier, 1-5 parts offiltrate reducer, 0.05-2 parts of encapsulating inhibiting agents, 0.1-3 parts of polyamine inhibiting agents, 1-5 parts of lubricant, 0.1-1 part of alkalinity regulator, 2-25 parts of inorganic salt, and 0-200 parts of weighting agents. The micro-nano particle blocking agents and the chemical blocking agents in the water-based drilling fluid of the shale gas horizontal well reinforced well wall have the effect of reinforcing the well wall in a cooperative mode, can effectively block micropore seams of shale to hinder pressure transmission, can further obviously improve the membrane efficiency of the shale, and facilitates the balance anti-collapse function of chemical activity.

The invention discloses a shale micropore size and fluid distribution analysis method. The shale micropore size and fluid distribution analysis method comprises the following steps that shale gas reservoir rock is collected, and a natural core is manufactured; the relaxation characteristic of hydrogen-contained fluid in core pores is measured through a nuclear magnetic resonance spectrometer, and a relaxation time T2 distribution map of clay water is obtained; the core is processed to obtain a saturated core, and a relaxation time T2 distribution map of saturated fluid and a summation curve are obtained; a T2 distribution map of effective fluid is obtained; a T2 distribution map of irreducible fluid and saturability Swi of bound water are obtained; a T2 distribution map of surplus water and water saturation Sw are obtained; the T2 distribution maps of the fluids are converted into a pore size distribution map, the shale clay deadline and the irreducible fluid deadline are obtained, and then the shale micropore size and fluid distribution are obtained. The nuclear magnetic resonance spectrometer is adopted, the pore size and distribution of the shale and size and distribution positions of water drops in the pores are analyzed quantitatively and qualitatively, and the result is reliable.

The invention provides a nanometer blocking agent for an oil-based drilling fluid and a preparation method of the nanometer blocking agent. The nanometer blocking agent comprises the following components in parts by weight: 10-40 parts of styrene, 20-60 parts of methyl methacrylate, 0.3-1.0 part of emulsifier, 130-150 parts of deionized water, 1.0-2.0 parts of cross-linking agent and 0.1-0.2 part of redox initiator. The preparation method of the nanometer blocking agent comprises the following steps of mixing the emulsifier, the cross-linking agent and deionized water and evenly stirring to obtain a mixture; adding styrene and methyl methacrylate into the mixture and emulsifying for 20-30 minutes to obtain a pre-emulsion; adding the redox initiator into the 20-35wt% pre-emulsion, raising the temperature to 60-80 DEG C, reacting for 20-30 minutes, dropwise adding the residual pre-emulsion and continuously reacting at 60-80 DEG C for 2-5 hours to obtain the nanometer blocking agent for the oil-based drilling fluid. Due to adoption of the nanometer blocking agent for the oil-based drilling fluid disclosed by the invention, the nanoscale microcrack can be effectively blocked and the problem that the well wall of a shale gas well easily collapses is solved and the nanometer blocking agent is simple in preparation method.

The invention discloses a shale gas well productivity evaluation and prediction method. The method comprises the following steps: an expression of a differential equation of a single-phase seepage mathematical model is obtained; the differential equation is solved and represented by a pressure form to obtain a seepage velocity and output formula; a deliverability equation is determined through fitting production data; the derived output formula is arranged to obtain a shale gas horizontal well staged fracturing output formula; boundary pressure (pe) required to be known can be known from the shale gas output formula; and as shale gas has the influences of absorption and desorption, a deviation factor is required to be corrected to obtain formation pressure of a shale gas reservoir. The prediction method deduces the deliverability equation for a shale vertical well and a horizontal well according to the desorption and dispersion characteristics of the shale gas, so that a shale gas output evaluation method is built, the precise output prediction is obtained, and the economic efficiency is improved.

The invention provides a shale gas reservoir quality evaluation method based on logging information. The method includes the steps that the logging information and core information of a target layer section are collected; the organic carbon content, the clay content, the formation pressure coefficient and the gas content of the target layer section shale are determined according to the logging information and core information; the effective thickness of target layer section shale stratum is determined according to the organic carbon content; the buried depth of the shale stratum is determined according to the effective thickness; the weighted values corresponding to the organic carbon content, the clay content, the formation pressure coefficient and the total gas content, the effective thickness and the buried depth are determined respectively according to prestored shale gas well data and gas pool deliverability; the quality of a shale gas reservoir is evaluated according to the weight values, the organic carbon content, the clay content, the formation pressure coefficient, the total gas content, the effective thickness and the buried depth. By means of the method, a shale gas reservoir quality evaluation method is established, and the actual production requirements for reservoir quality and capacity level prediction are met in shale gas exploration and development.

The invention discloses a shale gas well CO2 and slickwater mixing fracturing technology, and relates to the technical field of shale gas exploiting, in particular to the mixing fracturing technology by adopting CO2 and slickwater. In the construction process, a fracturing truck, a fracturing blender truck, a CO2 tank truck, a CO2 pump truck, a measuring truck, a fracturing manifold truck, an acid tank, propping agents and a liquid storage pot group need to be prepared, the fracturing manifold truck is provided with a low-pressure manifold and a high-pressure manifold, and the measuring truck is provided with a monitoring instrument, and the technology is characterized by comprising seven steps of doing well site planning, pressure testing, acid liquid processing, CO2 fracturing construction, slickwater fracturing construction, well closing after fracturing, and flow opening and flowback after fracturing. The shale gas well CO2 and slickwater mixing fracturing technology has the advantage that the shale gas exploiting method which is low in cost, low in relative construction difficulty, small in damage to a shale gas reservoir stratum and efficient is achieved.

The invention relates to a method for improving the complexity index of a deep shale gas fracture. The method is characterized in that when a fracturing design of the a deep shale gas well is performed, selection and an injection manner of a fracturing fluid, selection of a supporting agent, and the number of perforations are optimized and controlled, and an artificial main fracture can be opened and communicate with a natural fracture as much as possible in an extending process; extension of a single fracture is longer, expansion of the single fracture is wider, and finally the complexity of the deep shale gas fracture can be improved to the greatest extent. The method can be used for deep shale gas reservoirs having the depth of more than 3500 meters and in which the natural fractures containing carbonate minerals are distributed in a reconstruction range of the artificial main fracture, and a certain included angle is formed between the fracturing main fracture and the natural fractures. The method is reasonable in design, is simple in process, is easy to operate, is high in fracturing construction successful rate, can effectively increase the volume of deep shale gas segment fracturing fractures, can remarkably improve the fracturing construction effect, and can acquire more economic benefits.

The invention discloses a method and a system used for determining well control dynamic reserves of a shale gas well. The method comprises the steps of obtaining an initial formation pressure of a shale gas reservoir, and calculating a well bottom flow pressure through structure data and production data of the gas well; establishing a first interpolation table based on a conversion relationship between a pressure and a pseudo-pressure to establish a corresponding relationship between the pressure p and the pseudo-pressure m(p); establishing a second interpolation table based on given basic parameters and Za(p) defined by a matter balance equation of the shale gas reservoir to establish a corresponding relationship between the pressure p and a ratio of the pressure p to Za(p); and based on the initial formation pressure, the well bottom flow pressure and the production data, determining the well control dynamic reserves of the shale gas well by adopting the first interpolation table, the second interpolation table and a productivity equation. According to the method and the system, a shut-in pressure is not needed to recover an evaluated average formation pressure in calculation; and a calculation result is suitable for various applications such as reasonable shale gas well production allocation, reasonable development technology policy making, development scheme optimization and the like.

The invention relates to instant recoverable slippery water for a shale gas reservoir. The slippery water consists of the following components in percentage by weight: 0.02-0.1 percent of a friction-reducing agent, 0.2-2.0 percent of potassium chloride, 0.1-0.5 percent of a cleanup additive, 0.1-0.5 percent of an anti-swelling agent and the balance of water, wherein the friction-reducing agent is polyacrylamide or a polyacrylamide derivative of which the molecular weight is 5*105-1*106; the cleanup additive consists of 0.5-2.0 percent by mass of a fluorocarbon surfactant, 10-15.0 percent by mass of a low molecular alcohol solvent, 3.0-5.0 percent by mass of a high molecular alcohol additive, 10.0-20.0 percent by mass of a technical grade hydrocarbon chain surfactant and the balance of water; and the anti-swelling agent is a cation polyquaternary salt, poly-quaternary phosphate or a poly-quaternary sulfate. The slippery water can be fully dissolved and swelled within 20-30 seconds for forming a uniform system without oxidizing a gel breaker, damage to the crack diversion capability can be reduced, a cracking reverse discharge liquid can be recycled, and waste liquid treatment cost is lowered.