340 results about "Bottom pressure" patented technology

A method for controlling well bore pressure based on model prediction control theory and systems theory, which belongs to the field of well bore pressure control technique, includes: detecting a well bottom pressure, a stand pipe pressure, a casing pressure, an injection flow rate and an outlet flow rate during construction process, and determining the presence of overflow or leakage; if there is no overflow or leakage, then fine-adjusting the wellhead casing pressure according to the slight fluctuations of the well bottom pressure, the stand pipe pressure or the casing pressure, ensuring that the well bottom pressure, the stand pipe pressure or the casing pressure are at a set value; if there is overflow or leakage, then using a well bore multi-phase flow dynamic model to simulate and calculate the overflow or leakage position and starting time of the overflow or leakage, predicting the variation over a future time period of the well bore pressure in the well drilling process, and utilizing an optimization algorithm to calculate the control parameter under a minimum of an actual well bottom pressure difference during the future period; and repeating the optimization process for the next time period after a first control parameter is selected and set. The present method enables the well bore pressure to be controlled within the allowable fluctuation range of a project, thus achieving precise pressure control.

The invention relates to a device and a method for measurement, in particular to the method for calculating the mechanical properties of a series of rock sample materials by recording relationships between testing forces/loads and indentation depths/displacements at different moments. The device comprises a rack, a DC motor, displacement measurers, a rigid flat-bottom pressure head and a sample fixing station, wherein the rack is divided into two layers; the upper layer of the rack is provided with the DC motor of which one end is connected with the rigid flat-bottom pressure head; the displacement measurers are distributed about the rigid flat-bottom pressure head; and the sample fixing station is fixed on a base of the lower layer of the rack. The reliability and effectiveness of the method can be evaluated by comparing basic rock mechanical property measurement results with those obtained by other conventional testing means. In addition, compared with conventional mechanical test methods such as single-pressing tests, single-pulling tests, triaxial compression tests and the like in laboratories, the method has the advantages of short test process, simplicity and convenience of operation, low requirements on samples, economy and the like.

The invention relates to a well drilling method of a through tubing of a gas lift under-balanced coiled tubing, which is applied in the technical field of petroleum well drilling. The through tubing operation way of the coiled tubing is adopted for carrying out under-balanced well drilling or low-pressure well drilling on target well sections at the lower part in a shaft with a drilled upper borehole, wherein the target well sections are a vertical well, a directional well or a horizontal well. The method has the following effects: the adoption of the through tubing operation of the coiled tubing can form three circulation channels by utilizing the coiled tubing, an oil tube and a sleeve, and a matching pipe column has good universality, does not need a special drilling column or an inner tube and does not need to use a rotary blowout preventer and other special equipment; a gas injection channel and a slurry injection channel are independent mutually, thereby being capable of more conveniently controlling the well bottom pressure and the under-pressure value and using an underground power drilling tool and a slurry pulse measurement system which are applicable to slurry well drilling to carry out well drilling operation and trajectory control; and the method does not need to be connected with a single and can keep the continuous circulation during the tripping process and the drilling process, and realize the full-process controllable under-balanced well drilling operation and the full-process controllable low-pressure well drilling operation.

The invention discloses a method and a device for water drive oilfield advantage channel recognition. Unstable pressure restore well testing data are applied to recognize advantage channels formed during development of water drive oilfields. The method includes: step of setting a well testing typical characteristic curve layout, step of calculating well testing bottom pressure derivatives, step of drawing a testing well relation curve and step of judging existence and development level of the advantage channels, and the device comprises a typical characteristic curve layout setting module, a well bottom pressure measuring module, a well bottom pressure derivative calculation module, a testing well relation curve drawing module and a judging module. Compared with the prior art, the method for water drive oilfield advantage channel recognition is high in accuracy, high in generality, easy to implement, high in operability and capable of providing technical support for implementation of subsequent oilfield yield-increasing measures and designing of recovery ratio improving schemes.

The invention relates to a granary, a stored grain weight detection system and method and a sensor arrangement method, and provides the granary stored grain weight detection method based on the arrangement of two loops of sensors arranged on the bottom. The core technology comprises arrangement of inner and outer two loops of bottom pressure sensors, grain pile weight detection model based on bottom pressure intensity and side pressure intensity mean value estimation, and system calibration and modeling method and the like. The method has the advantages of high detection precision, low requirement for the performance of sensors, high applicability, simple device, convenient use and maintenance, and facilitating to carry out remote online granary quantity detection and granary condition monitoring and the like, and the demand for carrying out remote online quantity detection of grains stored in commonly-used granaries can be met. Since the detection method can be suitable for quantity detection of stored grains in a plurality of granary structures, the method has huge application value, and provides a new technological means for guaranteeing nation grain quantity safety.

The invention discloses a rock triaxial compression acoustic emission test system, comprising a mechanics testing system (MTS) 815 rock servo test system, wherein a triaxial chamber of the system is internally provided with an upper pressure head and a bottom pressure head; an acoustic emission detector is arranged in the bottom pressure head; a shield signal of the acoustic emission detector penetrates out the triaxial chamber from a reserved communication channel of a base of the system; and a shield signal line is connected with a preamplifier, so as to realize outdoor transmission of a detection signal of the acoustic emission detector. By utilizing the rock triaxial compression acoustic emission test system disclosed by the invention, the acoustic emission signal can be monitored more comprehensively and truly; and the test system can be used for providing a more reliable test method and test results for predicating rock fracture, so as to prevent mine disaster accidents generated in rock body fracture.

The present invention relates to oil and gas extracting apparatus and method suitable for deep well and super deep well, and aims at raising the hydrocarbon reservoir yield via lowering the pressure in bottom of gas lift well and solving the artificial lift problem of various kinds of well. The technological scheme of the present invention includes: injecting high pressure air via ground pipe and oil jacket to pneumatic motors in well gas booster pump to drive motor pistons and pump pistons; pumping out well liquid via the opened sucking valve, pump barrel and opened draining valve; and exhausting the mixture of exhaust air and pumped well liquid via oil pipe to well head output pipe. The present invention has the advantages of both gas lift and staff pump, can lower the bottom pressure to level lower than gas lift, and is especially suitable for the artificial lift of low pressure low potential oil/gas well, deep well and super deep well.

The invention discloses a P-typed doped cuprous oxide film material, which comprises the following steps: setting the doped density of nitrogen in the film at 1X1015cm-3-5X1019cm-3 with one cuprous oxide phase and molecular formula at Cu2O: N; adopting DC reacting magnetic control sputtering method to prepare, common carrier as substrate, red copper disc with purity at 99. 99% as target material; setting argon gas and oxygen, nitrogen as the working gas and reacting gas separately with gas purity at 99. 999%; making the flow rate of oxygen and nitrogen at 3: 2 and the bottom pressure of sediment chamber at 1. 2X10-3Pa-1. 0Pa; setting the substrate temperature between normal temperature and 100 deg. c and sputtering pressure at 400V with current at 50mA and power at 20W; depositing the film for 20min.

The invention relates to a wearable foot bottom pressure acquisition device for artificial limb control, and the device s characterized by comprising an insole, and a pressure sensing module and a signal transmission module both integrated in the insole, wherein the pressure sensing module comprises four pressure sensors which are arranged in the insole; and the four pressure sensors convert detected foot bottom pressure signals into variable resistance values and transmit the variable resistance values to the signal transmission module for transmission measurement. The invention provides the wearable foot bottom pressure acquisition device for artificial limb control aiming at the insufficiency of control signals for smart artificial lower limbs and overcoming the existing technical shortcomings. The acquisition system realizes real-time acquisition of time sequence and distribution information of foot bottom pressure, and is capable of providing policy basis in a plurality of aspects such as gait phase, movement model and body gesture for the control decision of the smart artificial limb after processing the information, thereby assisting the smart artificial limb to well replace the lost limb of the disabled. The wearable foot bottom pressure acquisition device for artificial limb control can be widely applied to artificial limb control.

The invention discloses a pressure-limited and discharge-quantity-unlimited fracturing method for increasing the shale gas crack transforming size. The pressure-limited and discharge-quantity-unlimited fracturing method comprises the steps that (1) reservoir evaluation before fracturing and real-time evaluation of the fracturing construction earlier stage are conducted; (2) a layered small testing fracturing test is conducted on a straight well guiding well; (3) simulation analysis is conducted through software MEYER; (4) normal fracturing construction is conducted, and in the construction midway, one-time or two-time instantaneous pump stopping is conducted; (5) the wellhead construction anticipated pressure is derived reversely through the well bottom pressure; (6) as long as the wellhead construction pressure is lower than the anticipated pressure of the step (5), the discharge quantity is increased to enable the wellhead pressure to approximate the anticipated value; and (7) if the wellhead construction pressure after the discharge quantity is increased still does not reach the anticipated pressure, the construction sand-liquid ratio is increased. According to the pressure-limited and discharge-quantity-unlimited fracturing method for increasing the shale gas crack transforming size, the various problems caused by using a discharge-quantity-limited method can be solved, so that the actual after-fracturing transforming size of a shale reservoir is increased, and the complexity of man-made cracks is improved.

The invention discloses a safe and efficient mud drilling jet mill bit for horizontal wells. The safe and efficient mud drilling jet mill bit is characterized in that a jet crushing device and a high-concentration turbulence sand-pumping device are mounted on a conventional bit. The jet mill bit mainly comprises a jet crushing part and a high-concentration turbulence sand-pumping part. The jet crushing part is characterized by comprising reverse natural-vibration cavitation jet nozzles, mixing chambers, throat tubes, debris separation accelerating tubes, crushing targets, crushing chambers and bypasses; the high-concentration turbulence sand-pumping part is characterized by comprising well-bottom debris stirring and cleaning channels, debris suction tubes and bit nozzles. On the basis of principles of a sand pump, the debris suction tube and the well-bottom debris stirring and cleaning channel function in pumping high-concentration turbulence debris, so that well bottom pressure difference can be reduced effectively and mechanical drilling speed is increased; on the basis of the principles of the jet mill, debris is crushed further under hydraulic pulse cavitation jet effect, so that liquid and solid suspending flowing is achieved and debris beds formed in the horizontal wells is eliminated.

A hydraulic ride control system for a working vehicle such as a wheel loader is provided with boom cylinders, an actuator control valve for controlling a pressure in bottom pressure chambers of the boom cylinders, an accumulator connected to the bottom pressure chambers of the boom cylinders via a connection line, an opening control valve having a pilot chamber to selectively communicating or cutting off the connection line depending on a pressure in the pilot chamber, and a selector unit for selectively feeding a pressure to or draining a pressure from the pilot chamber. The selector unit comprises a controller for variably controlling an opening of the opening control valve.

The invention provides an air quantity control device and air quantity control method of a centralized smoke extraction system and the centralized smoke extraction system and relates to the technicalfield of air purification. The air quantity control device comprises a fan main machine, an air valve control module, an air quantity detection module and a pressure acquisition module. The air quantity detection module detects the air quantity of a branch pipe in real time and sends the air quantity of the branch pipe to the air valve control module; the air valve control module controls switch-on of an air quantity regulating valve of a started range hood, sends a range hood starting signal to the fan main machine and regulates the air quantity regulating valve according to the air quantityof the branch pipe, so that the air quantity of the branch pipe is within a set air quantity valve range; the pressure acquisition module acquires the bottom pressure of a smoke extraction pipeline and sends the bottom pressure to the fan main machine; and the fan main machine controls a roof fan to operate according to the range hood starting signal and regulates the rotating speed of the roof fan according to the bottom pressure. The air quantities of floors are kept balanced, power of the roof fan is sufficient, and the air quantity is self-adapted and is not affected by the structure of the centralized smoke extraction system.

The invention discloses a multifunctional oil reservoir simulation experiment device. The device comprises a cubic vessel, a simulation experiment pit-shaft (1), a multi-parameter sensor (2), and cable connectors (3). The cubic vessel comprises a box body (4) and a cover plate (5), wherein a cavity is formed inside the box body (4), a plurality of inserting holes (6) are distributed in a base plate of the box body (4), partition plates (7) are evenly arranged all around each inserting holes (6), connecting holes are formed in the side wall of the box body (4), the pit-shaft (1) of a simulation pit and the wire cable connectors (3) are installed inside different inserting holes, and the multi-parameter sensor (2) is placed inside the cavity. The invention further discloses an experiment method using the device. The device and the system have the advantages of being capable of simulating various pit conditions, even in distribution of pressure in the bottom portion of the box body, also capable of simulating sites where stimulation pressure is distributed unevenly, capable of measuring flow in any small sections inside any pit-shaft, genuine and believable in experiment result, and capable of intuitively observing bottom water rising trends.

The invention discloses a concrete column base joint containing a high-ductility replaceable energy-dissipation connecting assembly. The concrete column base joint is arranged on the bottom of a rectangular-section column of a concrete structure, and comprises a concrete column, the high-ductility replaceable energy-dissipation connecting assembly and a concrete base, wherein the high-ductility replaceable energy-dissipation connecting assembly is separately welded with the concrete column and a steel connecting block pre-embedded in the concrete base to form a continuous reliable force transmission system. The bottom of the concrete column is equipped with a column bottom reinforcing core column, so that column bottom pressure can be borne under action of an earthquake, and damages are avoided; and the high-ductility replaceable energy-dissipation connecting assembly is mounted on four side surfaces of the column base joint, so that stressed longitudinal bars on the original positionsare replaced, and therefore, hysteretic behavior can be utilized to dissipate earthquake energy during a medium earthquake or a big earthquake, and damages can be controlled inside.

The invention discloses a double-wall drill-pipe counterflush drilling jet pump drill bit which is characterized by comprising a double-wall drill bit and a bridge-type double-pipe flow passage, a jet pump and a sand washing device which are arranged inside the double-wall drill bit. The bridge-type double-pipe flow passage replaces a flowing adapter joint at the upper part of a bottom drilling assembly in the double-wall drill-pipe counterflush drilling and an effect that drilling fluid and debris directly enter an inner pipe of a double-wall drill pipe from a debris suction pipe of the double-wall drill-pipe counterflush drilling jet pump drill bit is implemented, so that the shaft bottom debris cleaning efficiency is improved; the jet pump sucks shaft bottom fluid and shaft bottom pressure difference is reduced, and thus, on one hand, the debris at the shaft bottom is promoted to be separated from the shaft bottom and be lifted in an accelerating manner so as to promote shaft bottom debris cleaning efficiency and on the other hand, underbalance is implemented and a mechanical drilling speed is improved.

A hydraulic pump displacement control apparatus for a working vehicle capable of reliably detecting the working vehicle under excavating operation and reducing loss in power is provided. For this purpose, the control apparatus includes a bottom pressure detector (45) for detecting a hydraulic pressure in a bottom side (13A) of a cylinder (60) for operating a working machine (10), a displacement control device (41) for controlling a displacement of a variable displacement hydraulic pump (26), and a controller (50) which determines that an excavating operation starts when a predetermined time elapses with a detection value from the bottom pressure detector at a predetermined value or less and thereafter, the detection value exceeds the predetermined value, and outputs a displacement control signal to reduce the displacement of the hydraulic pump to a predetermined displacement that is smaller than the maximum displacement to the displacement control device.

The invention discloses an excavation deviation processing method of a raise-boring machine for a deep vertical shaft. The method includes the steps that the position of a pilot hole tail end drill is determined according to the drill stem deviation angle, the vertical shaft height and other parameters, and a mucking pilot shaft and a muck discharging channel are formed through expanding excavation; then, after the mucking pilot shaft is formed, the vertical shaft is excavated in a drilling and blasting mode, and when the mucking pilot shaft deviates and loses the mucking function or mucking is unsmooth, expanding excavation is performed on the part between the vertical shaft and the mucking pilot shaft so that the mucking pilot shaft can perform mucking effectively and smoothly; after exaction is completed, the deviation expanding excavation part is backfilled so that the verticality of the vertical shaft can be guaranteed and the requirement of pressure steel pipe installation for the verticality of the vertical shaft can be met. According to the method, under the condition that a pilot hole deviates, it is guaranteed that the mucking pilot shaft performs mucking effectively, and the verticality of the vertical shaft is also guaranteed; in pressure vertical shaft or surge shaft construction in water conservancy and hydropower engineering, the method has the advantages of reducing repeated drilling extraction of a pilot hole, shortening the construction period and improving the strength of a backfilled region behind a pressure steel pipe at the bottom of a pressure vertical shaft, and therefore the method can be widely applied to small-diameter deep vertical shaft or inclined shaft construction with a short construction period.

A working vehicle (1) includes: a vehicle body (2); and a boom (31); a bucket (32); a boom driving unit including a boom cylinder (36); a bucket driving unit configured to swing the bucket (32); a boom-bottom pressure sensor (460) configured to detect a boom-bottom pressure of the boom cylinder (36); and a working equipment controller (10) configured to control at least one of a lift motion of the boom (31) and a tilt motion of the bucket (32). The bucket (32) includes an inclined portion (44). The working equipment controller (10) controls the lift motion or the tilt motion by comparing a threshold set in accordance with an inclination angle of the inclined portion (44) with the boom-bottom pressure.

The invention discloses a horizontal hydraulic support for mines, which includes a support plate, a hydraulic cylinder is fixed at the bottom of the support plate, the bottom of the hydraulic cylinder is connected to a damping cylinder, the damping cylinder is also connected to the bottom of a pressure cylinder, and the top of the pressure cylinder is connected to an air pump; in the present invention, Since the hydraulic oil in the hydraulic cylinder under the support plate is connected to each other, according to the principle of the connector, the hydraulic pressure will keep the support plate level at this time, the air pump will inflate the pressure cylinder, and the high-pressure gas will push the hydraulic oil in the pressure cylinder into the sleeve, pushing the first The first piston moves upwards, the air pump reverses, and the gas in the pressure cylinder is pumped out, so that the support plate can be lowered; when vibration occurs, the first piston moves up and down in the sleeve due to the force of the vibration, and presses the hydraulic oil in the damping cylinder. Due to the S-shaped distribution of the damping hole, the hydraulic oil rubs against the inner wall of the damping hole when it passes through, converting the mechanical energy of the vibration into internal energy, and the blocking plate in the damping hole can play a damping role, which can effectively suppress the vibration .