9 results about "Sweep efficiency" patented technology

The application provides a CO2 oil displacement storage regulation optimization decision method and system, the method obtains a three-dimensional geological model, production dynamic data and monitoring data of a target working area; a component numerical simulation technology is used to fit a CO2 injection production dynamic history of the target working area, so that target operation parameters of a simulation operation model are adjusted and determined to obtain a matched production simulation operation model; a gas-oil ratio is determined according to the production dynamic data, and then a gas channeling index is calculated, and a target well group meeting the conditions of the gas channeling index is selected; a relationship curve distribution between a Peclet number, an oil increment and a component sweep efficiency is determined by simulating different injection speeds to determine an optimized target injection speed; and development parameters corresponding to different injection modes are simulated, and the target injection mode is determined in combination with the gas channeling index, the sweep efficiency and the miscibility degree. The scheme can overcome the defects of the prior art that the parameter optimization is not in place and the precision is insufficient, and can consider the particularity of the CO2 oil displacement mechanism to establish a regulation optimization strategy based on dimensionless parameters.

The application discloses a kind of automatic frequency tracking method and system based on sweep mode, frequency is swept by the way of combination of " rough sweep+fine sweep ", first by " rough sweep " of big step, " rough sweep " is the method of difference of adjacent frequency point reflected voltage to judge sweep direction, determine a smaller frequency range containing inflection point, in this frequency range, small step " fine sweep " is used, compare the size of each frequency point reflected voltage, the frequency point corresponding to the minimum reflected voltage is the resonant frequency point of accelerating tube.The application compared with traditional frequency discrimination type automatic frequency tracking method, on the basis of ensuring sweep precision, improve sweep efficiency, can quickly obtain the actual resonant frequency of accelerating tube.

The present application provides a kind of shale oil horizontal well volume fracturing ultimate recoverable reserves prediction method, first based on the reservoir geological parameters of the horizontal well to be measured and adjacent horizontal well in the same block, establish productivity prediction model, calculate effective fracture network sweep efficiency using reservoir numerical simulation method, and establish effective fracture network sweep efficiency and maximum recoverable reserves correlation prediction chart;Secondly, the correlation coefficient between the geology and volume fracturing reconstruction parameters of the horizontal well to be measured and the fracture network sweep volume is calculated using grey relational analysis method, and the key control parameters affecting fracture network sweep volume are determined;Finally, the fracture network sweep volume prediction model coupled with key control parameters is established, the fracture network sweep volume of the horizontal well to be measured is obtained, the effective fracture network sweep efficiency is obtained, and the maximum recoverable reserves of the horizontal well to be measured is obtained using the correlation prediction chart. The method can quickly predict the maximum recoverable reserves of any horizontal well by establishing the correlation chart of effective fracture network sweep efficiency and maximum recoverable reserves.

This invention belongs to the field of oil and gas field reservoir engineering technology, specifically a method for characterizing the impact of clastic reservoir heterogeneity on reservoir efficiency. First, mineral composition, porosity and permeability, mechanical parameters, and spatial configuration of the study area are obtained. Based on the interlayer spatial configuration, flow units are divided to quantitatively evaluate the constraints of interlayers on effective reservoir space. Through creep experiments and alternating load experiments, mechanical property degradation models of different types of interlayers under long-term high pressure and injection-production cycles are established. A dynamic model of interlayer sealing capacity evolution is constructed to quantify its long-term potential to suppress vertical fluid flow. By coupling the interlayer volumetric sweep efficiency, the mechanical degradation model, and the sealing capacity evolution model, a comprehensive reservoir efficiency impact coefficient is established, enabling a quantitative evaluation of reservoir efficiency under different types of interlayer constraints. This invention elevates the impact of interlayer heterogeneity on reservoirs from a static description to a dynamic quantitative evaluation, providing a scientific basis for the site selection optimization and injection-production strategy formulation of underground reservoirs.

This invention discloses a method for evaluating the multiphysics coupling relationship in gas-driven oil extraction. The method includes: acquiring reservoir parameters and constructing a discrete topological space based on a graph data structure in memory; inputting the state vector into a physical information neural network surrogate model to perform phase transition dimensionality reduction calculations, outputting solid phase precipitation and viscosity fields; calculating dynamic real porosity by combining mechanical strain and chemical dissolution; generating a dynamic topology trimming operator based on percolation theory, modifying conductivity properties in the underlying memory to sever the mathematical connectivity of physical blockage zones; assembling a fully implicit Jacobian matrix based on the updated conductivity and iteratively solving it; finally, eliminating isolated dead zone volumes and generating an evaluation index containing a tensor of real sweep efficiency and phase blockage damage index. This invention eliminates the matrix singularity divergence problem, significantly improving simulation computing power and gas-driven evaluation fidelity.

This utility model discloses an associated gas power generation tail gas reinjection system, including a gas-liquid mixer connected to a tail gas outlet pipe and a liquid-liquid mixer. The liquid-liquid mixer is connected to the bottom of an oil well produced water storage tank and an additive storage tank via pipelines. A compressor and a gas-liquid distribution mechanism are sequentially connected to the outlet of the gas-liquid mixer. The gas-liquid distribution mechanism includes a main distribution pipe connected to the compressor outlet, with multiple branch distribution pipes connected to it. The outlets of the branch distribution pipes are connected to the injection well. This utility model provides an associated gas power generation tail gas reinjection system that can utilize associated gas power generation tail gas to increase production, reduce the gas injection cost for oilfield production enhancement, and achieve synergistic reinjection of power generation tail gas and oil well produced water, thereby improving sweep efficiency.

This utility model provides a sweeping handle for use with oil tank cars on railway trestle bridges in oil depots. The sweeping handle includes a handle and a head. The handle is made of aluminum tube, with a reinforcing aluminum tube added from the middle to the end of the aluminum tube. The head consists of an aluminum plate, two semi-circular aluminum sheets, and oil-resistant and anti-static thick adhesive. The aluminum tube has a gap on one side of the handle connection for inserting the aluminum plate. The radius of the two semi-circular aluminum sheets is larger than that of the aluminum tube and covers the connection between the aluminum tube and the handle. The semi-circular aluminum sheets have screw holes and are fixed to the handle with aluminum bolts. The oil-resistant and anti-static thick adhesive is welded to the aluminum plate with three aluminum rivets. This effectively solves the problem of difficulty in collecting and recovering residual oil after unloading from the loading arms of oil tank cars on railway trestle bridges in the prior art. It has the advantages of being compact and flexible, highly practical, having high oil sweeping efficiency, low labor intensity, safety and reliability, and easy maintenance. It can effectively clean the residual oil in the oil tank car and ensure that the residual oil is not wasted.

The present application relates to shale oil development gas drive mining technical field, disclose a kind of shale oil gas displacement front evaluation method based on three-dimensional seismic ant body attribute, including obtaining reservoir and fluid basic parameter and carrying out dimension elimination and standardization processing, form initial multi-source evaluation data;Based on initial multi-source evaluation data, the manifold dimension reduction of high-dimensional fracture perception data body and linear feature embedding processing are carried out, and core feature parameter is extracted;Permeability, start-up pressure, displacement time and sweep efficiency calculation model are sequentially constructed according to core feature parameter, and the corresponding four physical parameters are obtained;The above physical parameters are dimensionless and weight calculation, and multidimensional normalization data and dynamic weight coefficient are obtained;Fusion multidimensional normalization data and dynamic weight coefficient are comprehensively evaluated, and the final evaluation result is output.The present application solves the problem of evaluation distortion caused by complex fracture network, improves the evaluation accuracy, and guides the gas injection and production construction.

The application provides a carbon dioxide oil displacement sealing well spacing decision method and system, which comprises the following steps: firstly, carrying out crude oil-CO2 phase state experiment of a target reservoir to determine the viscosity variation characteristics of crude oil before and after CO2 injection; calculating the starting pressure gradient according to the viscosity of crude oil before gas injection and the minimum viscosity of crude oil after gas injection reflected by the experiment; then calculating the minimum driving pressure gradient under different injection-production well spacings to determine the injection-production well spacing before and after gas injection; calculating the economic limit well spacing and the economic best well spacing of the target reservoir by using the curve intersection method; determining the relationship curves between the well spacing and the CO2 displacement miscible degree and the CO2 displacement component sweep efficiency respectively; and selecting the target well spacing by comprehensively considering the distribution characteristics of the injection-production well spacing before and after gas injection, the economic limit well spacing and the economic best well spacing. The scheme can overcome the problems of the prior art, such as incomplete consideration of factors and insufficient accuracy of well spacing range selection, and forms an efficient and reliable well spacing calculation method by comprehensively considering the CO2 oil displacement mechanism, the reservoir characteristics and the economic benefits.