11 results about "Pressure shale" patented technology

The invention discloses a method and a device for predicting the test yield of a monoclinic normal-pressure shale gas well. The method comprises the following steps: (1) establishing a monoclinic normal-pressure shale gas well test yield prediction scale area; (2) key parameters are selected to establish a geological sweetness index, geological feature analogy is carried out, and a geological condition similarity coefficient of the to-be-evaluated well is solved; (3) establishing a scale area normal pressure shale gas well test yield prediction model, and solving related parameters; and (4) establishing a test yield prediction model of the to-be-evaluated well, and predicting the test yield of the to-be-evaluated well. The method has the beneficial effects that the simple and clear test yield prediction method is established based on the monocline structure normal-pressure shale gas enrichment characteristics and the test yield change rule, the monocline structure normal-pressure shale gas well test yield can be rapidly and accurately predicted, a scientific basis is provided for low-exploration-degree area well position deployment and exploration and development investment decision, and the method is suitable for large-scale popularization and application. Exploration and development risks are reduced, and exploration and development effects are improved.

The present invention discloses an integrated gathering, transportation and processing skid-mounted system for high- and low-pressure shale gas distribution and transmission, comprising a two-phase flowmeter skid-mounted subsystem, a first separator skid-mounted subsystem and a second separator skid-mounted subsystem arranged in sequence; the two-phase flowmeter skid-mounted subsystem comprises a two-phase flowmeter skid, and a plurality of first air inlet pipes, a first manifold and a second manifold installed on the two-phase flowmeter skid; the first separator skid-mounted subsystem comprises a first separator skid, and a second air inlet pipe installed on the first separator skid; the second separator skid-mounted subsystem comprises a second separator skid, and a second separator installed on the second separator skid. The beneficial effects of the present invention are as follows: the present invention integrates the two-phase metering skid-mounted subsystem, the first separator skid-mounted subsystem and the second separator skid-mounted subsystem into one, which can complete the gas-liquid two-phase metering, gas-liquid separation and high- and low-pressure distribution and transmission of shale gas; this structural design has highly integrated functions and a simple and compact structure.

The application discloses a high-pressure cut-off valve for shale gas well and belongs to the technical field of high-pressure shale gas exploitation equipment, and mainly solves the problem of overload fracture of a valve core caused by high-pressure unbalanced torque in the prior art. The cut-off valve comprises a valve body, a valve cover and a valve core, the valve body and the valve cover are connected through threads, and the valve core penetrates through the valve cover. The high-pressure cut-off valve can balance the unbalanced torque of high-pressure fluid through the structure of the plugging platform and the gyro-type boss, so that the driving energy consumption of the cut-off valve is reduced and the working efficiency is improved.

According to the gas injection, liquid drainage and gas production method for the shale gas reservoir, by means of multi-layer three-dimensional development of fracture network connectivity, a pressurizing well which is multiple in radiation adjacent wells, good in fracture connectivity and low in pressure and yield in a block is preferably selected as a block low-pressure gas injection well, and gas with good permeability is injected (the injected gas comprises but not limited to N2, CO2 and hydrocarbon gas); the gas enters the horizontal section of the adjacent well by means of connectivity cracks through diffusion and propulsion of the gas, accumulated liquid of the horizontal section of the drainage production well is effectively discharged, the drainage production well is activated to continuously produce gas, and the target of gas injection, liquid drainage and gas production is achieved. By means of an existing shale gas fracturing crack communication system, the advantages of an integral gas reservoir box and the intricate well-well relation, the problem of discharging accumulated liquid in a long horizontal section of low-pressure shale gas is solved, and efficient liquid discharging and gas production of a three-dimensional multi-well horizontal shaft of a shale reservoir are achieved through gas injection displacement. Gas injection huff and puff realizes deep liquid drainage and gas production of a reservoir shaft of the gas injection well, the cumulative yield of the gas well is improved, and the gas reservoir recovery efficiency is improved.

According to the technical scheme, the shaft cleaning regulation and control device and method for drainage and gas recovery of the normal-pressure shale gas well are characterized in that the shaft cleaning regulation and control device comprises a ground, a blowout prevention opening is formed in the top of the ground, and a third manual wheel type valve is fixedly installed on the bottom face of the blowout prevention opening; a small four-way pipe is fixedly installed on the bottom face of the third manual wheel type valve, and a junction box is fixedly installed outside the small four-way pipe. The cleaning assembly is arranged on the bottom face of the small four-way pipe and used for cleaning the interior of a shaft, and the cleaning assembly comprises two fourth manual wheel type valves. The device can deal with blockage of solid-phase particles in the shaft in real time, and when the blockage severity exceeds a certain degree and workover operation needs to be conducted, the device can clean the interior of the shaft before the operation is conducted; temporary plug removal is achieved for the shaft and the screw pump, the function of temporarily coping with complex working conditions is achieved, and effective coping can be provided for actual production problems of normal-pressure shale gas.

The invention relates to a method for calculating the porosity of a normal-pressure shale reservoir based on logging data. The method comprises the following steps: acquiring a rock skeleton logging sound wave value, a rock skeleton density value, a rock skeleton uranium content and a whole-well-periphery transverse wave speed; based on the rock skeleton logging sound wave value, the rock skeleton density value and the rock skeleton uranium content, adopting a regression model to calculate the initial porosity; and calculating a tectonic stress sensitive index based on the principal stress orientation, anisotropic strength and rock mechanical parameters of the tectonic stress field, establishing a dynamic correction model in combination with core-logging joint calibration, and correcting the initial porosity through the dynamic correction model. According to the method, quantification of the anisotropy characteristics of the porosity is achieved, modeling is conducted through multi-source data cooperative processing and stress field dynamic response, the limitation that the influence of a stress field is ignored in porosity calculation of a complex structural area in a traditional method is overcome, the precision and dynamic adaptability of reservoir porosity evaluation are improved, and technical support is provided for efficient development of shale gas reservoirs.

The invention discloses a self-adaptive adjusting oil nozzle device for a normal pressure shale gas well, and belongs to the field of oil nozzle devices.The self-adaptive adjusting oil nozzle device comprises a gas well conveying pipe, a parameter detection and control mechanism is installed at one end of the gas well conveying pipe, and a heat preservation mechanism and a pressure relief mechanism are installed on the surface of the parameter detection and control mechanism; the parameter detection and control mechanism comprises a flow detector which is fixedly connected to one end of the gas well conveying pipe through a bolt; through cooperative use of the devices, based on flow and pressure parameters, an existing control system, an existing control algorithm and an existing logic are adopted for analysis, and based on an analysis result, a driving motor is controlled through the control system, so that the driving motor controls a threaded rod to drive a conical valve element to move front and back, and a gap between a sealing plate and a feeding pipe is adjusted; therefore, flow and flow velocity of materials are controlled, wellhead pressure is stabilized at a threshold value, pressure fluctuation is slowed down, stable production period is prolonged, fluid in a shaft is guaranteed to be in an optimal flow state, and gas exhaust efficiency is improved.

The invention relates to a method for determining the installation distance of a liquid-accumulation-free tubular column of a normal-pressure shale gas well. The problems that an existing liquid-accumulation-free pipe column drainage gas recovery process is not clear in application limit, not clear in process tripping-in position and the like are solved. According to the technical scheme, the method comprises the steps that the liquid accumulation state of a gas well is calculated according to the gas production rate and the water production rate of the gas well, whether a liquid-accumulation-free tubular column needs to be put down or not is judged, if the gas well is subjected to liquid accumulation, the height of a liquid-carrying production section and the number of installed liquid-accumulation-free valves are calculated according to the actual minimum conveying pressure after the liquid-accumulation-free valves are installed, and the installation distance of the liquid-accumulation-free tubular column is determined; according to the method for determining the installation distance of the liquid-accumulation-free tubular column of the normal-pressure shale gas well, the influence of the liquid production capacity and the pressure of the gas well on the tripping-in position of the liquid-accumulation-free tubular column is considered, and the application effect of the liquid-accumulation-free tubular column under the conditions of high liquid yield and low pressure of the normal-pressure shale gas well is improved.

The invention belongs to the technical field of pipeline blockage clearing, and particularly relates to a normal-pressure shale gas discharge and recovery pipeline blockage clearing and dredging device which comprises a self-driving module, a driving wheel is arranged on the self-driving module, a spring is connected between the driving wheel and the self-driving module, and a bearing is connected to the middle of the surface of one side of the self-driving module in a penetrating mode. A supporting sleeve column is fixedly installed on the outer arc face of the bearing, and the inner side wall of the supporting sleeve column is sleeved with a connecting sleeve. A plurality of cutting tool bits distributed in an annular array in the cutting assembly are matched with crushing wheels through the integrated cutting assembly, the washing assembly and the dirt suction assembly, hard blockages can be rapidly crushed, the blocky blockages are ground into small-particle-size chippings, and the high-pressure water spraying device washes the inner wall of a pipeline through high-pressure water flow to effectively remove residual dirt. The sewage suction assembly synchronously sucks crushed residues and sewage, secondary blockage and multi-assembly collaborative operation are avoided, and compared with a traditional single blockage clearing mode, the blockage clearing time is greatly shortened, the shale gas discharging and mining operation efficiency is remarkably improved, and shutdown loss caused by pipeline blockage is reduced.

The invention discloses a shale gas adsorption density calculation method. A shale kerogen model is constructed by adopting a molecular simulation technology, a high-temperature and high-pressure shale gas isothermal adsorption curve is simulated and calculated, and rock gas absolute adsorption capacity is converted into relative adsorption capacity according to a function relationship between the relative adsorption capacity and the absolute adsorption capacity established according to molecular quantity characteristics of adsorbed gas and free gas; deriving and establishing a function relationship between relative adsorption capacity and absolute adsorption capacity of adsorption gas density correction based on an adsorption theory, and meanwhile, calculating to obtain a shale gas adsorption state density change curve chart; by introducing a correction coefficient, a method for representing the adsorption state density through the shale gas free state density is provided, and an adsorption gas density calculation model is established. A high-temperature and high-pressure shale gas adsorption state density change characteristic research method is innovatively provided, shale gas adsorption state density scale upgrading application combining microcosmic and macroscopic is achieved, change characteristics of shale gas adsorption density can be revealed more accurately, and accurate calculation is conducted through a formula model.

Disclosed is an independent double-negative-pressure shale shaker, and belongs to the technical field of petroleum drilling solid control. The independent double-negative-pressure shale shaker comprises a base, a fluid discharge device, an inclination angle adjustment mechanism, a screening device, an exciting motor and a double-negative-pressure system, wherein the double-negative-pressure system comprises a first negative-pressure system and a second negative-pressure system which are relatively independent; the first negative-pressure system dries drilling fluid of a first screen mesh set close to a material outlet, and the second negative-pressure system increases the treatment capacity of drilling fluid of a second screen mesh set close to the first screen mesh set; and meanwhile, in the deep well section, the second negative-pressure system can be switched to a fluid mist suction state, fluid mist on the screen surface is reduced, the safety is improved, and the pollution of fluid mist is reduced.