The invention provides a strata-series recombination and mining method of a multilayer sandstone reservoir in a waterflooding-development middle-and-later period. The method comprises the step of recombining the multilayer sandstone reservoir in the waterflooding-development middle-and-later period into three sets of development strata series, wherein regarding the oil layer combination of the first set of development strata series, the communication coefficient is larger than 80%, the moisture content is smaller than 20%, the producing degree is smaller than 10%, and the pressure coefficientis larger than 0.8, regarding the oil layer combination of the second set of development strata series, the communication coefficient is 60%-80%, the moisture content is 20%-60%, the producing degreeis 10%-15% and the pressure coefficient is 0.6-0.8, and regarding the oil layer combination of the third layer of development strata series, the communication coefficient is smaller than 60%, the moisture content is larger than 60%, the producing degree is larger than 15% and the pressure coefficient is smaller than 0.6; mining all sets of the development strata series. According to the technicalscheme, effective utilization of the multilayer sandstone reservoir in a waterflooding-development middle-and-later period when the utilization degrees of different layers are greatly imbalanced is achieved, and the waterflooding-development effect of the reservoir is improved.

Strata-series recombination and mining method of multilayer sandstone reservoir in waterflooding-development middle-and-later period

The invention discloses a bidirectional displacement method of a positive rhythm thick oil reservoir. The bidirectional displacement method comprises the steps that a producing well carries out production at the top of the oil reservoir, and a high-seepage layer large duct or a high-seepage band is used as a water injection channel to carry out water injection so as to carry out bottom water drive; and meanwhile a water injection well keeps water injection, and the water injection well keeps carrying out water injection in the direction of the producing well on the middle upper portion of theoil reservoir so as to carry out lateral water drive. A high water consumption layer is used as a horizontal well for injection, the producing well only perforates the top of the oil reservoir, or thehorizontal well is designed at the top of the oil reservoir for development, a flow field is changed to effectively control water drive to march forward along a dominant migration pathway, the dominant migration pathway is utilized for achieving sufficient affecting in the vertical direction under the action of gravity, and the recovery efficiency of an ultrahigh water content oil field is improved to the largest extent.

Bidirectional displacement method of positive rhythm thick oil reservoir

The invention provides a reservoir heterogeneity determining method and device. The reservoir heterogeneity determining method comprises the steps of marking positions of all samples on a reservoir figure; drawing a data box-and-whisker plot of penetration rates of all samples according to the penetration rate of each sample, wherein the data box-and-whisker plot is used for representing a distribution range of the penetration rates, an upper whisker of the data box-and-whisker plot is a maximum value in the penetration rates of all samples, a lower whisker of the data box-and-whisker plot isa minimum value in the penetration rates of all samples, and the data box-and-whisker plot comprises a rectangular box representing penetration rate concentrated distribution; enabling a reservoir represented by each sample to be associated with the data box-and-whisker plot; and determining reservoir heterogeneity according to the reservoir figure and the data box-and-whisker plot which are associated. The reservoir heterogeneity determining method is a reservoir heterogeneity visual determining scheme, the heterogeneity of the reservoir can be visually and accurately reflected, possible problems of oil and gas field development can be pre-warned, a basis is provided for oilfield development layer series division and development scheme design, and the reservoir heterogeneity determining method is beneficial for efficient oil reservoir development.

Reservoir heterogeneity determining method and device

The invention discloses a multi-well cooperative energization throughput method of a low permeability reservoir. The multi-well cooperative energization throughput method includes the steps that first, according to well pattern deployment, a well and at least one oil well are optimized in the same well group; second, according to the hole amount of the well group, the injection amounts of the welland the oil wells are determined; third, an injection process is optimized according to the physical characteristics and the well conditions of target layers of the oil wells and the wells; fourth, awell injection liquid system is optimized according to laboratory tests; fifth, an injection mode is optimized; sixth, wellhole preparation before completion of construction is conducted; seventh, the well and the oil wells are fractured and injected by water at the same time, all adjacent wells in the same well group are shut in, and a pressure gauge is installed; and eighth, after completion ofconstruction, the oil wells and the well are kept in the shut-in states, and according to the pressure change, the well opening time of the corresponding oil wells and the surrounding adjacent wellsis selected. According to the multi-well cooperative energization throughput method, the shortages of the prior art are overcome, and the problem that the formation energy cannot be replenished timelyand effectively due to the difficulty of water injection in existing low permeability reservoirs can be effectively solved.

Multi-well cooperative energization throughput method of low permeability reservoir

The invention discloses a well selection method of water injection wells used for fracturing and injection augmentation. The well selection method of the water injection wells used for fracturing andinjection augmentation comprises the following steps that (a) all oil wells in an oil field range requiring fracturing and injection augmentation are selected, and the oil wells are scored; scoring parameters comprise moisture content, fluid production capacity, nearest oil well distance, nearest water well distance, previous fracturing effects, fracturing technology, fracturing formula, reservoirpermeability, and small-layer fluid production profile; and (b) the oil wells are ranked from high to low according to the score, the well with higher rank are more suitable for fracturing, and waterinjection wells are arranged around the well with higher rank. The well selection method of the water injection wells used for fracturing and injection augmentation aims to provide the well selectionmethod of the water injection wells used for fracturing and injection augmentation so as to solve the problem of weak pertinence of water injection well selection in the process of fracturing and injection augmentation in the middle and later stages of the prior art, and the aims of targeted selection of the water injection wells and improvement of oil and gas development efficiency in oil reservoirs are achieved.

Well selection method of water injection wells used for fracturing and injection augmentation

The invention provides an adjustment method of a high-water-cut-stage rhombic inverted nini-spot well pattern of a multi-layer low-permeability sandstone oil reservoir The method comprises the following steps that firstly, the superior direction on a reservoir plane is judged; secondly, a high-water-cut oil well is judged in the plane, and a high-water-cut layer in multiple oil layers in the longitudinal direction; thirdly, according to the water driving oil effect of the oil layers, the development layer series are divided; fourthly, for the high-water-cut oil wells, the high-water-cut oil layers are plugged, and separated layer water injection is conducted for water injection walls; fifthly, in the mode that the high-water-cut oil wells are turned into the water injection wells in the fourth step, the structure of the rhombic inverted nini-spot well pattern is adjusted By means of the adjustment method, the inefficient water circulation of the layers high in permeability and thickness can be reduced, the water driving oil effect and the reserves producing degree of the layers low in permeability and thickness can be improved, the oil well outputs are further improved, the oil recovery rate is increased, and the final water drive recovery efficiency and the economic benefits of oil reservoir exploitation are improved

Adjustment method of high-water-cut-stage rhombic inverted nini-spot well pattern of multi-layer low-permeability sandstone oil reservoir

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Adjustment method of high-water-cut-stage rhombic inverted nini-spot well pattern of multi-layer low-permeability sandstone oil reservoir