7results about How to "Improve the transformation effect" patented technology

The present application relates to a novel long-acting solid coated slow-release acid and a preparation method. The solid coated slow-release acid has a core-shell structure, the shell layer comprises a polymer, and the core comprises an acid former; the acid former is at least one selected from chlorinated aromatic hydrocarbons, chlorinated acid esters and acid chlorides, and the polymer is at least one selected from polyesters, poly(meth)acrylates, epoxy resins, polyolefins, polyacrylonitriles, polyimides, polyvinyl alcohols. The solid coated slow-release acid has the advantages of small environmental pollution, long acid release time, excellent deep penetration performance, high acid generating efficiency, easy storage and transportation, good slow-release performance and simple preparation.

The application provides a differentiated hole arrangement design method for increasing the number of fracture cracks in a heterogeneous reservoir, and belongs to the technical field of oil and gas exploitation. Reservoir quality parameters, rock mechanics parameters and ground stress parameters of a target well and fracture crack distribution of a neighboring well of the target well are obtained to design the number of fracture cracks / cluster number, position and shape of each cluster of cracks. A mathematical model of the fracture cracks is selected according to the ground stress parameters and the shape of each cluster of cracks to calculate the net pressure required by the shape of each cluster of cracks. A random algorithm is used to determine the displacement of each cluster of cracks and the number of perforation holes, and the friction of each cluster of crack holes is calculated. The bottom hole pressure of each cluster of cracks is calculated according to the net pressure of each cluster of cracks and the friction of each cluster of crack holes, and if the bottom hole pressure of each cluster of cracks is equal, the next step is performed. The ground pumping pressure is calculated by using a fluid mechanics method, and if the ground pumping pressure meets the set conditions, the design is completed. The method can reduce the downhole complex risks such as channeling, improve the fracturing construction efficiency and reservoir reconstruction effect, and reduce the construction cost.

The invention belongs to the technical field of CO2 fracturing, and particularly relates to a CO2 fracturing crack propagation simulation experiment device and a simulation method thereof. The device comprises a CO2 fracturing medium pumping system, a triaxial stress loading system, an acquisition module and a data calculation control system. The CO2 fracturing medium pump injection system comprises a CO2 injection system, an N2 injection system and a water phase injection system and is used for simulating different CO2 fracturing process artificial fracture expansion forms; the acquisition module is used for acquiring actual wellbore parameters, reservoir parameters, CO2 physical property parameters and CO2 injection parameters; and the data calculation control system is used for calculating the instantaneous temperature and pressure of CO2 at a perforation shot hole in the early stage of fracturing according to the actual shaft parameters, the reservoir parameters and the CO2 physical property parameters, and calculating experimental CO2 injection parameters according to the CO2 injection parameters. The problems that an existing simulation device has few simulation working conditions and cannot accurately simulate actual working conditions are solved.

The application provides a construction parameter optimization method for improving shale reservoir reconstruction rate, and the method comprises the following steps: establishing a three-dimensional shale reservoir fracture propagation model according to shale reservoir formation parameters of a target block; determining the value range of important construction parameters; determining multiple sets of combined parameters according to the value range of the important construction parameters; applying the multiple sets of combined parameters to the three-dimensional shale reservoir fracture propagation model one by one, performing numerical simulation on fracture propagation by using a finite element method, obtaining multiple simulation results respectively corresponding to different sets of combined parameters, and the simulation results include fracture propagation length; calculating reservoir reconstruction rates respectively corresponding to different sets of combined parameters according to the fracture propagation length; taking each reservoir reconstruction rate as a target response value, analyzing the significance of the construction parameters, and then determining the best combined parameters. The optimization method can improve the reconstruction effect of the shale reservoir, and further improve the development effect of shale oil and gas.

The application discloses a coal seam thickness and coal body structure spatial distribution combination type classification method, and belongs to the technical field of coal reservoir reconstruction. The method first collects well logging data of a coalbed methane well in a target area, and establishes a coal body structure well logging interpretation model based on coring samples, and then identifies the coal body structure of a well without coring. Subsequently, GSI quantitative classification criteria are established, sensitive well logging parameters are selected to establish a GSI prediction model, and the quantitative identification of the coal body structure type is realized by calculating the GSI value. Then, the coal seam thickness and the coal body structure spatial distribution combination type are classified in combination with the thickness, proportion and spatial combination mode of different coal body structures. The application can indicate the direction of efficient reservoir reconstruction of the coalbed methane well through accurate identification of the coal body structure and division of the combination type, and then ensure the reconstruction effect of the coalbed methane well.

The application discloses a kind of annular fracturing gas lift liquid discharge pipe columns and operating methods, including multiple groups of gas lift tools and throttling tools, when annular injection gas, gas enters cavity from the gap between the body of gas lift tool and gland, when injection pressure is greater than the pressure in gas cavity, lower valve body is pushed up, and the disengagement between upper ball valve and bidirectional valve seat, injection gas enters the tubing through bidirectional valve seat, and the liquid in the tubing is discharged by the gas lift tool;When injection pressure is lower than the pressure in gas cavity, upper ball valve is seated in bidirectional valve seat, and oil, casing passage is blocked, injection gas pushes annular fluid surface down, and the process of lower gas lift tool is repeated to open the liquid discharge operation, until the liquid in the tubing is discharged completely by the lowermost gas lift tool.The pipe column can realize rapid liquid discharge after fracturing, without well killing, down liquid discharge pipe column completion, avoid the damage to reservoir by well killing, ensure the modification effect, effectively improve the construction efficiency, reduce the operation cost.