The invention discloses an experiment device for monitoring high-speed shearing stability of a polymer molecule on line. The experiment device comprises a multifunctional constant-pressure control pump, a control pump connecting pipeline, a Z1 intermediate device, a Z2 intermediate device, a capillary, a P1 differential pressure sensor, a Y1 differential pressure signal processing and displaying device, a P2 differential pressure sensor, a Y2 differential pressure signal processing and displaying device, a thin pipe left end connecting pipeline, a thin pipe, a thin pipe right end connecting pipeline, a back-pressure valve, a constant temperature oven and a Z3 container. Under different temperature and pressure conditions, the relation between effective viscosity and the shearing rate, the relation between viscosity loss and the shearing rate, and the relation between the viscosity loss and the number of times of shearing as well as intrinsic viscosity change of polymer molecules can be researched when a polymer flows through the capillary.

Experiment device for monitoring high-speed shearing stability of polymer molecule on line

The invention relates to a well test analysis system and method used for a polymer-flooded dual-layer fluid channeling reservoir. The method specifically comprises the steps of 1) collecting a well bottom pressure value of a polymer injection well of the polymer-flooded dual-layer fluid channeling reservoir, and performing calculation to obtain an actual well bottom pressure change relation value of the polymer injection well of the polymer-flooded dual-layer fluid channeling reservoir; 2) according to a well bottom pressure expression of the polymer injection well of the polymer-flooded dual-layer fluid channeling reservoir and an input simulation parameter value, performing calculation to obtain a simulated well bottom pressure change relation value of the polymer injection well of the polymer-flooded dual-layer fluid channeling reservoir, and drawing a typical curve theory chart of the polymer-flooded dual-layer fluid channeling reservoir; 3) obtaining a well test interpretation parameter value of the polymer-flooded dual-layer fluid channeling reservoir according to a simulated parameter value corresponding to a corrected simulated well bottom pressure change relation value; and 4) analyzing a condition of the polymer-flooded reservoir according to the well test interpretation parameter value, and guiding oilfield development by adopting corresponding measures. The system and the method can be widely applied to the well test interpretation of the polymer-flooded dual-layer fluid channeling reservoir.

Well test analysis system and method used for polymer-flooded dual-layer fluid channeling reservoir

The embodiment of the invention provides a method and system for determining formation parameters of a vertical well shale gas reservoir. The method comprises: setting initial formation parameters; obtaining bottom-hole pressure according to the initial formation parameters through analog computation; drawing theoretical curves of the bottom-hole pressure, pressure drop and pressure derivatives; fitting the theoretical curves with corresponding actually measured curves to obtain fitting results; if the fitting results meet a pre-set precision requirement, determining the initial formation parameters to be actual formation parameters; if the fitting results do not meet the pre-set precision requirement, correcting the initial formation parameters according to a quasi-radial flow and a quasi-linear flow until the fitting results meet the pre-set precision requirement; determining corrected initial formation parameters to be the actual formation parameters. According to the method and the system, provided by the invention, the formation parameters are determined according to the quasi-radial flow and the quasi-linear flow, so that the technical problem of a non-steady state well testing method that the determination speed is slow is solved, and the aim of rapidly and accurately determining the formation parameters of the vertical well shale gas reservoir is realized.

Method and system for determining formation parameters of horizontal well shale gas reservoir

The invention discloses an experiment device for verifying a dynamic negative pressure perforation channel cleaning degree. According to the experiment device, a decompression chamber is connected to a rock sample target body through a connection pipe, a certain negative pressure value is set, and metal fragments and crushed rock in a perforation channel enter the decompression chamber through a communication pipe so that the problem that the existing device cannot directly and accurately forecast negative pressure difference in the perforation channel at different cleaning degrees is solved. The experiment device guarantees reliability of cleaning of the rock perforation channel and realizes research on influence produced by a petroleum casing pipe and an oil pipe gap on a blast pressure peak value and on a perforation channel cleaning degree. Flashy flows produced by negative pressure difference carry metal fragments and crushed rock and go through a through plugging metal plate and the process of the metal fragments and crushed rock rushing into the decompression chamber is observed through a high-speed camera so that it is determined that a flashy flow production medium is gas or liquid and a scientific basis of a flowing mechanism in the perforation channel is further provided.

Experiment device for verifying dynamic negative pressure perforation channel cleaning degree

The invention discloses a parameter interpretation method and system of a low-permeability oil-gas reservoir. The parameter interpretation method includes the steps that a fluid continuity equation is built, a flow equation comprising the quasi-threshold pressure gradient is set, a seepage equation is built through the fluid continuity equation and the flow equation, then the shaft type, the fluid property, the rock compression coefficient and the fluid compression coefficient of the low-permeability oil-gas reservoir are determined, a parameter set of the low-permeability oil-gas reservoir is set, the seepage equation is solved through the shaft type, the fluid property, the rock compression coefficient, the fluid compression coefficient and the parameter set of the low-permeability oil-gas reservoir, and the shaft-bottom calculating pressure is obtained; when the fitting accuracy of the shaft-bottom calculating pressure and the shaft-bottom measured pressure reaches preset accuracy, the present set parameter set serves as the actual parameter of the low-permeability oil-gas reservoir. By means of the parameter interpretation method and system, the parameter of the low-permeability oil-gas reservoir can be more accurately interpreted.

Parameter interpretation method and system of low-permeability oil-gas reservoir

The invention discloses a method and a system for obtaining a shear-thinning characteristic of a polymer solution in a stratum. The method comprises: obtaining a well bottom calculation pressure of a test well by utilizing a test well parameter for setting the test well and a pre-established polymer flooding mathematic model; then fitting the well bottom calculation pressure and a pre-obtained actually measured well bottom pressure; and when a fitting result meets a preset precision requirement, taking a current preset shear-thinning curve as a shear-thinning curve of the polymer solution in the stratum. According to the method, when the fitting result meets the preset precision requirement, the current shear-thinning curve is very close to the real shear-thinning characteristic of the polymer solution in the stratum, so that a rheological characteristic of a polymer in an underground porous medium is truly reflected with a method for inverting the shear-thinning characteristic of the polymer solution in the stratum, the shear-thinning characteristic of the polymer solution in the stratum is determined, and the production of polymer flooding is better guided.

Method and system for obtaining shear-thinning characteristic of polymer solution in stratum

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Method and system for obtaining shear-thinning characteristic of polymer solution in stratum