235 results about "Well engineering" patented technology

The invention discloses a method of quickly calibrating an oblique redundant strapdown inertial navigation system. The method comprises the following steps of: 1, describing a mounting misalignment angle of the oblique RSINS (Redundant Strapdown Inertial Navigation System), and giving a calibrating measurement equation; 2, designing a calibrating scheme of the oblique RSINS; and 3, constructing a calibrating simulation platform of the oblique RSINS, and verifying accuracy of the calibrating method by utilizing the simulation platform. The method, provided by the invention, is capable of quickly calibrating the oblique RSINS on the basis of a tri-axial position/speed turntable, calibrating parameters, such as zero offsets, scale factors and mounting misalignment angles of a redundant accelerometer and a gyro, are calibrated by utilizing a four-position method and a three-position rotating method, and accuracy of the calibrating method can be verified by utilizing the simulation platform. The method, provided by the invention, has the advantages of high calibration precision, simple operation, capability of meeting quick calibration requirements of the oblique RSINS at low and middle precisions, and better engineering application value.

The invention relates to a two-dimensional magnetic-optical trap system, which belongs to the field of neutral cold atom generation technology, and is characterized in that saddle-type reversed Helmholtz coils are adopted for forming the magnetic-optical trap system. The device is compact in integral mechanical structure and easy for miniatured and engineering application; by utilizing the inherent characteristics, such as compact structure, low installing precision requirement and better radial magnetic field gradient uniformity, of the saddle-type reversed Helmholtz coils, electricity power consumption required for forming a magnetic-optical trap is reduced; through controlling atom steam pressure intensity by electrified current, continuous cold atom sources with low speed, high throughput and small divergence angle are obtained, and a better engineering application platform is provided for an atomic frequency standard, an atom interference gyroscope or other cold atom physical experiments.

The invention relates to shale gas exploitation oil-based drilling fluid well-cementing prepad fluid, and belongs to the technical field of petroleum drilling engineering chemistry. The well-cementing prepad fluid is characterized by comprising the following components by volume percent: 30-50% of cleaning fluid, 30-50% of flushing fluid and 0-40% of spacer fluid; the cleaning fluid is composed of a cleaning fluid additive, a weighting agent and water; the flushing fluid is composed of a flushing fluid additive, a weighting agent and water; the spacer fluid is composed of a spacer fluid additive, a weighting agent and water; the cleaning fluid additive is composed of a non-ionic surfactant and a mutual solvent, the flushing fluid additive is composed of a surfactant and a mutual solvent, and the spacer additive is composed of a tackifier and a filtrate reducer. The prepad fluid is capable of effectively eliminating an oil-based drilling fluid mud cake, effectively tidying a well wall and effectively isolating the drilling fluid from the cement mortar; the aims of effectively replacing and isolating are achieved, so that the well-cementing quality is improved.

The invention provides a method for identifying a voltage sag reason. The method for identifying the voltage sag reason comprises the following steps of (1) using the discrete Fourier transform to calculate a spectral density function, converting the voltage in a time domain to the voltage in a frequency domain, (2) calculating the characteristic quantity related to identification of the voltage sag reason, (3) defining a sag phase number N1, judging whether swell and a sag combination N3 exist or not, and (4) identifying the voltage sag reason. The method for identifying the voltage sag reason is comprehensive and higher in adaptability to changes of voltage sags, and can be easily improved, verification is carried out on the basis of really-measured data of a power grid, and the calculation result has better engineering practicability.

The invention relates to a construction method for an inspection well, in particular to a reinforced concrete inspection well whole prefabricated hoisting construction method. The method comprises that a formwork of a base plate is firstly erected, then reinforcing steel bars of the base plate are bound, finally concrete is poured on the base plate and burrs need to be removed thoroughly between the reinforcing steel bars in the inner circle and the outer circle; reinforcing steel bars of a well body are bound through the reserved bars of the base plate, after binding, a crane hoists inner steel formworks in the crane with cooperation of manual power, outer steel formworks are installed, finally the concrete is poured, after the formworks are disassembled, the formworks are wound by plastic thin films and water is sprayed on the formworks to cure the formworks; and a drawing method of double cross is adopted in hoisting process. Compared with the prior art, the reinforced concrete inspection well whole prefabricated hoisting construction method has the advantages of effectively solving the quality problem caused by insufficient construction space, greatly improving work efficiency, shortening work period, having good social benefit and economic benefit and being wide in application space in concrete inspection well engineering and high in popularization value.

The invention provides a robust estimation state estimating method based on a maximum index absolute value target function. The robust estimation state estimating method comprises the steps of: providing a robust state estimation basic model based on the maximum index absolute value target function; introducing an auxiliary variable into the robust state estimation basic model based on the maximum index absolute value target function to obtain a robust state estimation equivalent model based on the maximum index absolute value target function; and by using a primal-dual interior point algorithm, solving the robust state estimation equivalent model based on the maximum index absolute value target function. Proved through example analysis, the robust estimation state estimating method has the advantages of strong robustness and high computing efficiency, and better engineering application prospect.

The invention provides a mine shaft well engineering surrounding rocks artificial intelligence stage division method which comprises the following steps: (1) establishing a nerve network model, (2) training a sample set, (3) carrying out network training and (4) carrying out network simulation. The invention has the following advantages: a network system is simple in operation, influence of artificial factors can be eliminated, an interaction relation between factors can be automatically found, and with regards to a shaft well project which lacks a deep part stage division experience, the system can solve stability stage division of a rock well under complex conditions of high ground stress, high underground water pressure, high ground temperature and the like at a shaft well deep part and has a strong engineering application value.

The invention relates to a reliability statistical inference method based on multivariate accelerated degradation data. The method mainly comprises the following steps: (1) using a stochastic process to respectively establish an accelerated degradation model for accelerated degradation data of each performance parameter; (2) using a maximum likelihood estimation method to obtain a parameter value of each accelerated degradation model; (3) respectively establishing a marginal survival function based on a stochastic process model for each performance parameter; (4) using a Copula function to establish a correlation model between the marginal survival functions; (5) using a Monte Carlo method to estimate a correlation model parameter value; (6) constructing a reliability function under a rated stress for inferring the reliability of a product. The reliability statistical inference method based on multivariate accelerated degradation data has a wider application scope and better engineering applicability.

The invention relates to a power distribution network multi-target reactive-power optimization method based on a non-dominated neighbor-domain immune algorithm. Active power loss and reactive compensation input are regarded as targets to be optimized, and a power distribution network multi-target reactive-power optimization model considering constraints such as active balance, reactive balance, power distribution network power limits, node voltage limits, reactive compensation capacity limits, transformer tap limits, compensation node limits and line transmission power limits is established. The power distribution network multi-target reactive-power optimization model is solved by utilizing the non-dominated neighbor-domain immune algorithm. According to the algorithm, the non-inferiority and distributivity of a finally obtained Pareto solution are ensured by adopting proportional cloning, combination, variation and other operations and selection based on crowding distances. The specific configurations of a reactive compensation device having minimum active power loss and lowest compensation input cost can be rapidly and reliably obtained, and the optimization method has a better engineering application prospect.

The invention belongs to the field of oil base mud or drilling cutting treatment, and particularly relates to a process for recycling oil base mud from oil base mud well drilling waste. The process is characterized in that the treating and recycling process comprises the process of efficient centrifugal filtration, homogenizing and centrifugal sedimentation, the oil base mud in the oily waste generated in the oil base mud well drilling engineering is efficiently recycled through optimization of process parameters, and the standard of reusing the well drilling process is met. The process has the advantages that the recovery rate of the oil base mud is high, the recycled oil base mud can be directly reused in the well drilling engineering, secondary pollution is not generated, the process is simple, and the operating condition is mild, and the process is suitable for treating the oily waste generated in various oil base mud well drilling engineering. After the treating and recycling process carries out treatment, the oil base mud resources in the oily waste are efficiently recycled, the recovery rate is high, the pollutant load is greatly reduced, and obvious economic benefits and environmental benefits are achieved.

The invention discloses an airborne adaptive transmission alignment algorithm for deflection deformation of an airfoil, and relates to the technical field of aerospace strap-down inertial navigation.The airborne adaptive transmission alignment algorithm includes calculating an initial position, a speed and attitude information of a sub inertial navigation according to an airborne main inertial navigation information to carry out an inertial navigation strap-down calculation; and adjusting an observation noise Rk according to a flying height to carry out the alignment calculation of the sub inertial navigation. The adaptive of a filtering algorithm is realized, and the environment adaptive capacity and the alignment precision of a speed plus attitude matching algorithm are effectively improved. The algorithm is simple to implement, reliable in operation, good in rapidness and adaptability, and has better engineering application value.

The invention discloses a neutral line breaking detection protection method and device, belonging to the technical field of low-voltage system protection. The neutral line breaking detection protection device mainly comprises a current detection unit, a detection signal converting unit, a signal processing unit, a protection executing unit and an acousto-optic alarm unit. According to the neutral line breaking detection protection method, a three-phase line current signal and a neutral line current signal are acquired, and are processed and analyzed by using a singlechip, therefore whether the neutral line is broken is judged; and when the neutral line is broken, the singlechip sends an action signal for disconnecting a circuit and sending an alarm. The invention has the advantages of simple and easy used elements, higher automation degree, capability of effectively detecting the breaking condition of the neutral line and protecting the neutral line, and better engineering applicability.

The invention discloses an annular pressure downhole control valve, and belongs to the technical field of oil-gas well engineering. The annular pressure downhole control valve is designed to solve theproblem of annular pressure anomaly in an oil-gas well. The annular pressure downhole control valve comprises a coupling and an outer cylinder which is in fit connection with the coupling; the coupling and the outer cylinder are matched to form a first accommodating cavity and a second accommodating cavity, the first accommodating cavity communicates with a casing pipe, and the second accommodating cavity communicates with the exteriors of the first accommodating cavity and the casing pipe to form a one-way flow channel; and the second accommodating cavity is internally provided with a valvecore which can move along the inner wall of the second accommodating cavity to open or close the one-way flow channel. According to the annular pressure downhole control valve, the abnormal annular pressure in oil-gas well completion and production engineering can be alleviated, integrity and production safety of a wellbore are ensured, the structure is simple, the machining cost is low, and the cost of controlling the annular pressure can be effectively reduced.

The present invention discloses a fuzzy control method for double-fed electric field subsynchronous oscillation inhibition. The method concretely comprises the following steps: 1, establishing an aerodynamic model, a shafting model, a double-fed induction motor model, a rotor side and net-side convertor control module, a direct current capacitor dynamic process model and a serial compensation line model; 2, allowing the magnetic torque Te control outer shroud of a double-fed fan rotor side convertor to employ fuzzy control taking replacing of a traditional PI control method, taking an electromagnetic torque error E and an error variation EC as an input variation, and taking the variation DU of the control amount as an output amount to design a fuzzy controller; 3, adding a self-adjusting module, and constructing the fuzzy controller capable of parameter online self adjusting; and 4, employing the fuzzy controller to control the double-fed electric field subsynchronous oscillation, and completing the inhibition of the double-fed electric field subsynchronous oscillation. The method is reasonable and reliable, and the applied fuzzy controller has better inhibition effect on the subsynchronous oscillation and has better engineering application prospect.

The invention discloses a segmented double-track system comprehensive assessment and hierarchical description method for the quality of electric energy, and belongs to the technical field of the quality of electric energy. The method comprises the following steps of: single index pretreatment, single index grade dividing, and the segmented double-track comprehensive assessment and hierarchical description. The invention also discloses a segmented double-track system comprehensive assessment and hierarchical visual display method for the quality of electric energy, and the hierarchical visual display method for the quality of electric energy is a cloud picture display method or a node display method. The invention comprises a segmented double-track system comprehensive assessment method for the quality of electric energy, which has a better engineering guiding significance. The segmented double-track system comprehensive assessment method for the quality of electric energy is provided with a hierarchical description method with the specific physical meaning and a visual display method with abundant and practical information, and can be applied to various aspects, such as regional large power grid electric energy monitoring and controlling systems, electricity market electric energy pricing mechanisms and electric energy trading platform construction.

The invention discloses a four-dimensional dynamic ground stress simulation method which comprises the following steps: S1, establishing a three-dimensional geologic model; S2, establishing a three-dimensional oil reservoir model and predicting a three-dimensional pore pressure field and a temperature field at different stages by utilizing production/injection dynamic parameters; S3, establishing a three-dimensional ground stress model; S4, forming an initial ground stress field; S5, establishing a four-dimensional dynamic ground stress model according to an initial three-dimensional ground stress filed model by taking the dynamic three-dimensional pore pressure field and the temperature field; S6, making a seepage-stress coupled solution and analyzing and calculating dynamic ground stress and pore elasticity parameters used for guiding wells engineering practice. The method has the beneficial effects that the changing situations of the dynamic ground stress and the pore elasticity parameters in an oil and gas exploitation process can be accurately reflected, so as to provide guidance for refracturing of old wells and drilling and completion operation of new wells.

The invention discloses a small-size well drilling engineering monitoring system. A directional joint is arranged at one end inside a connecting drill collar, the directional joint is connected with one end of a circulating sleeve, the circulating sleeve is connected with a main valve head assembly, the end, far away from the circulating sleeve, of the main valve head assembly is connected with asquating key pulse device, the end, far away from a screw rod, of the connecting drill collar is connected with one end of an engineering parameter measuring drill collar, the other end of the engineering parameter measuring drill collar is connected with a non-magnetic drill collar, a wireless receiving short section, a battery short section A, a probe tube short section and a fishing head are arranged inside the non-magnetic drill collar in sequence, and the engineering parameter measuring drill collar comprises a drill collar body, a control circuit, a drilling and pressing torque bending moment strain gauge, a transmitting short section, a battery short section B, a communication interface, a vibration sensor, an inner annular air pressure sensor and an outer annular air pressure sensor. An engineering parameter measurement short section has the characteristics of small size, high strength, strong pressure resistance, high temperature and the like, so that the applicability to a slim hole well, a high-temperature well and an ultra-deep well is achieved, and the safety of well drilling is guaranteed.

The invention discloses a method for ranking fault risks of high-voltage power transmission lines by taking real-time weather thunderstorm information into consideration. The method comprises the following steps that data integration is conducted on the basis of a Neo4j graph database, an equipment mapping table is established according to topological structure features of a power grid, a power grid thunder and lightning information system, a fault information system and historical weather information data are integrated, thunderbolt sections and non-thunderbolt sections of each line can be obtained by means of a traversal algorithm, and mathematical statistical laws are obtained by mining historical data of a grid structure model; according to future numerical weather prediction, dynamic search is conducted to provide the probabilities of lightning trip, namely the fault risk degrees, of the lines of different voltage classes of the south power grid in next few days, and a to-be-selected fault set is obtained by ranking the probabilities. According to the method, quantitative analysis can be conducted on the fault risk degrees of the lines, and compared with former methods only relying on experience of operating personnel, the method has better engineering practicability during operating scheduling, planning and designing of the practical power grid.

The invention relates to an ultrasonic and subsonic leaf type combined cascade of compressor, which is mainly designed according to the stator having inflow ultrasonic larger airflow rotation angle for high load compressor. The stator need to realize two functions of shock wave speed reduction and large airflow rotation angle at the same time, which can be realized with difficulty by conventional single row cascade. The invention realizes the two functions by the front and the rear row of cascades through the ultrasonic and subsonic leaf type combined cascade, namely the front row adopts ultrasonic leaf type to realize the shock wave speed reduction, and the rear row adopts subsonic leaf type to realize large airflow rotation angle. Optimal matching of the relative position of the front and the rear rows is performed, the front edge of the rear row in the circumferential direction is close to the front row pressure surface with a distance of 15-25% of cascade distance, and cascades in axial direction are not superposed or properly superposed, the wake of the front row can be well controlled at the rear row, the Mach number of rear row inflow is in proper range, the speed reduction and diffusion processes are smooth, thereby the combined cascade has better integral performance. The ultrasonic and subsonic leaf type combined cascade is suitable for inflow having Mach number of 1.0-1.5 and D factor of more than 0.7, and has better engineering application prospect.

The invention provides a method and a device for hot rolling forming of super-strength steel. Compared with the prior art, the method overcomes defects of an existing hot stamping and normal-temperature rolling forming method for super-strength steel. According to the characteristics of super-strength steel, a super-strength steel hot rolling forming technology with good heating efficiency is designed. By means of the method, the strength of a formed part can be multiplied, few waste defective goods are produced, the quality is stable and reliable, the continuous production requirements of a modern enterprise are met, the production efficiency is improved, rebounding deformation of the formed part is controlled effectively by a cooling device, and better engineering application value is realized.

The invention relates to the technical field of petroleum drilling engineering leakage stoppage, in particular to well entering fluid and anti-leaking gel and a preparation method thereof. The well entering fluid comprises, by weight, 0.25%-1% of gelling agents, 0.1%-0.5% of pH modifiers and the balance water. The preparation method for the well entering fluid comprises the step of evenly mixing the gelling agents, the pH modifiers and the water of a needed quantity to obtain the well entering fluid. The anti-leaking gel can serve as a front anti-leaking agent to be retained and accumulated near an inlet inside a leaking layer, cement slurry is prevented from leaking into a stratum, and the anti-leaking gel has good temperature-resistant shear-resistant characteristics and can simultaneously wrap solid particles of different grain diameters and have good retaining accumulating effect.

The invention belongs to the technical field of oil and gas well engineering, and particularly relates to an efficient filter cake cleaning liquid and a preparation method thereof, and the efficient filter cake cleaning liquid can be used for cleaning drilling fluid filter cake and can increase well cementation two interface cementing strength. The technical scheme of the filter cake cleaning liquid is as follows: the filter cake cleaning liquid comprises the following components: base oil, an aqueous solution, 4.15%-6.25% by mass of a surface active agent, 6%-8% by mass of an emulsifier, and 3%-4% by mass of a wetting agent; wherein the base oil uses white oil as a filter cake cleaning fluid continuous phase, a dispersing phase is the aqueous solution, and the volume ratio of oil to water is 7:3-8:2. The technical scheme adopts a base oil / surface active agent system to clean the filter cake to achieve the purpose of improve the well cementation two interface cementing strength and remove blocking.

The invention relates to the technical field of petroleum drilling engineering, in particular to a well wall reinforcing material. The raw materials of the well wall reinforcing material comprise a seal material, a reinforcing material and a support material. The well wall reinforcing material is prepared by the following method: as long as the seal material, reinforcing material and support material are uniformly mixed according to the required quantities, the well wall reinforcing material is obtained. Besides the excellent performance of the conventional comprehensive blocking agent, the well wall reinforcing material has higher blocking strength and smaller blocking depth, and has better blocking performance and larger capability of keeping the stability of a well wall. The well wall reinforcing material can greatly widen the safety density window of drilling fluid, provides a better guarantee for rapid and safe well drilling, and can effectively lower leakage preventing and blocking costs.

The invention discloses a tie-back self-lock mechanism for a suspended packer, which comprises a tie-back device and a self-locking device. The tie-back device comprises an upper connector, a central pipe, an elastic claw limit sleeve, an elastic claw and a tie-back inserting pipe. The self-lock device comprises a back-off connector, a tie-back barrel and a lower connector. The upper connector, the central pipe, the elastic claw limit sleeve and the tie-back inserting pipe are in threaded connection from up to down. The back-off connector, the tie-back barrel and the lower connector are in threaded connection from up to down. A ladder-shaped male buckle thread is arranged at the lower end of the elastic claw, a ladder-shaped female buckle thread matched with the elastic is arranged at the lower end of the back-off connector, the elastic claw moves up and down in the axial direction in a slide groove formed between the central pipe and the elastic claw limit sleeve, the tie-back barrel is positioned under the back-off connector, and the tie-back inserting pipe is positioned below the elastic claw. The tie-back self-lock mechanism can substitute tubular columns needing waterpower anchors to enable the tubular columns to be reliable in sealing, can pull out tie-back oil pipe strings at any time, and avoids accidents of oil-gas well engineering.

The invention relates to an expansion sleeve joint with double hook shaped thread connection for the connection of integral joint expansion sleeves in oil and gas well engineering. Two-end structures of a male thread joint and a female thread joint correspondingly form sealed cabins, the sealed cabins are sealed by two fastened and inversely fastened bowl shaped rubber obturating rings, the deflection angle of a first hook surface of a hook shaped contact surface correspondingly formed by a single hook shaped thread of the male thread joint and a single hook shaped thread groove of the female thread joint is 15 DEG, the deflection angle of a second hook surface is 28 DEG, the height of the second hook surface is 25 to 30 percent of that of the thread, the rounding radius between the first hook surface and the second hook surface is 0.5 mm, the deflection angle of the reverse side of the thread is 5 DEG, the conicity of the thread is 1:23-1:25, and a hook tip of a second hook of the thread has an arc surface. The expansion sleeve joint has the close occlusion of double hook shaped internal and external threads, eliminates stress concentration, has high strength, has double hook shaped multiple metal-metal sealing and metal-rubber-metal sealing, and has the characteristics of integral sealing, strength uniformity of an expansion joint and the like.

The invention relates to a two-dimensional fiber grating inclination sensor. The sensor comprises a counterweight ball, monitoring fiber gratings, a compensation fiber grating, short stainless steel columns, a protection casing and loose fiber tubes, wherein the main structure comprises the protection casing, the short stainless steel columns and an induction structure; the protection casing is asquare box with small holes at two corners for allowing the loose fiber tubes to pass through; the short stainless steel columns are located at the four corners of the square protection casing, have acircular cross section and are used for supporting the protection casing; the induction structure comprises the monitoring fiber gratings, the counterweight ball and the compensation fiber grating. The two-dimensional fiber grating inclination sensor is mainly theoretically based on a force balance principle, the monitoring mechanism is to generate two directional component forces in a plane whenthe counterweight ball is subjected to force balance, and accordingly, Bragg reflection wavelength of the fiber gratings changes along with the change of the out-of-plane angle of the sensor. Besides, the cross-sensitivity problem of fiber grating temperature and strain is solved by the compensation fiber grating. The two-dimensional fiber grating inclination sensor has definite structural stress, high response speed, high measurement precision and good stability, has a temperature self-compensation function, is easy to process and manufacture, is resistant to electromagnetic interference andhas better engineering application prospect.

This invention relates to a shaft engineering material used for pitprop and crosstie, mostly includes bamboo reinforcement skeleton. According to weight the bamboo reinforcement skeleton includes follow components: magnesia 10 to 80 shares, magnesium chloride 5 to 30, wood flour 10 to 50, semi-hydrated gypsum 5 to 20, plastic fibre 1 to 5, ferrous sulfate 1 to 10, oxalic acid 1 to 3, water 30 to 60 shares. This invention also relates to the preparation method. This invention can effectively avoide insufficiency of traditional stuff such as perishable, flammability and easy exploding, also possess unique merits such as ageing resistance corrosion prevention, fireproofing, waterproof and be able to saw and cut and so on in the moist roadway environment.