The invention provides a development method of an untabulated reservoir in an extra-high water-cut period. The development method comprises the following steps: acquiring definite geological development characteristics, employing status and water washing characteristics of the untabulated reservoir according to the geology, production and core well monitoring data of the untabulated reservoir; determining whether the untabulated reservoir meets the independent development conditions according to the aforementioned results; treating an independent untabulated reservoir at a forming course encountered in the drilling of an oil-water well as an object, and determining a development manner of the untabulated reservoir according to the distribution features of a tabulated reservoir and the untabulated reservoir; building a productivity evaluation model for the independent development of the untabulated reservoir according to a fracturing technology, stratums and fluid physical property data, providing corresponding technical limits, and developing in a determined surface reservoir development manner, so as to finish the development method of the untabulated reservoir in the extra-high water-cut period. According to the aforementioned development method, the water flooding of the untabulated reservoir in the extra-high water-cut period is effectively employed, thus the basis is provided to the scientific development of the untabulated reservoir, and the purpose of improving the production rate can be achieved.

Development method of untabulated reservoir in extra-high water-cut period

The invention discloses a method for evaluating and predicting the productivity of an ultralow-permeability reservoir oilfield. The method includes the following steps: firstly, collecting logging parameters reflecting the lithologic character, physical property, reservoir non-homogeneity, oil-bearing property and other geological parameters; secondly, averaging the parameters and selecting the maximum value during the building of a mathematical model; thirdly, introducing non-homogeneity parameters characterizing the reservoir permeability change, including variation coefficient, mutation coefficient, differential parameter and the like; and finally, building a multivariable linear regression productivity prediction model to evaluate the productivity. The method can consider multiple influence factors, saves test cost and test time in the prediction and evaluation of productivity of new wells, and has a good prediction effect.

Method for evaluating and predicting productivity of ultralow-permeability reservoir oilfield

The invention provides a quantitative analysis method and device of a main controlling factor of oil layer remaining oil. The quantitative analysis method comprises the following steps: according to the washing data of each rock core, determining the situation of the remaining oil in each rock core; according to stratum depth, homing each rock core to each oil layer, and determining the situation of the remaining oil in each oil layer; taking a coring well as a center to establish a coring dissection well block; according to the situation of the remaining oil in each oil layer, judging influence on the situation of the remaining oil in each rock core by the main controlling factor of an oil layer plane, the main controlling factor between the oil layers and the main controlling factors in the oil layers, and determining the main controlling factor of the remaining oil of each rock core; and according to different oil layer types or deposition types to which each rock core belongs, carrying out classification statistics on the thickness of the rock core, and carrying out the classification statistics on the thickness of the rock core with different main controlling factors of the remaining oil and a proportion. Dynamic data and static data are comprehensively applied, workload is reduced, subjective and objective factors and causes which affect the remaining oil on the plane, between the layers and in the layers can be effectively and simply clarified, and the potential of each class of remaining oil is evaluated.

Quantitative analysis method and device of main controlling factor of oil layer remaining oil

The invention provides a remaining oil distribution rule quantitative analysis method. The remaining oil distribution rule quantitative analysis method comprises the steps that 1, a value simulation model is built up, production history matching is conducted, and the model is solved; 2, result data is extracted, and statistics of index parameters are made; 3, a frequency distribution map of the remaining oil saturation and construction, permeability, oil layer thickness and pressure is drawn and analyzed; 4, a frequency distribution map and a cumulative frequency distribution map of the remaining oil reserve abundance and construction, permeability, oil layer thickness and pressure are drawn; 5, a frequency distribution map and an cumulative frequency distribution map of recoverable reserve abundance and construction, permeability, oil layer thickness and pressure are drawn; and 6, a result is obtained after comprehensive analysis is conducted. The remaining oil distribution rule quantitative analysis method is high in practicality, a remaining oil distribution mode and characteristics of an oil field are analyzed, and evidences are provided for follow-up digging and production increasing.

Remaining oil distribution rule quantitative analysis method

The invention discloses a strong edge-bottom water oil reservoir defining method comprising the following steps: (1) finely describing a target oil reservoir, and building an oil reservoir fine geological model; (2) on the basis of step (1), carrying out numerical simulation of the oil reservoir to modify and perfect the oil reservoir fine geological model; (3) using the modified and perfected oil reservoir fine geological model obtained in step (2) to calculate the underground pore volume of the edge-bottom water region and the underground pore volume of the oil region in the target oil reservoir; and (4) calculating the water body multiple of the underground pore volume of the edge-bottom water region and the underground pore volume of the oil region based on the underground pore volume of the water region and the underground pore volume of the oil region, and judging whether the candidate oil reservoir is a strong edge-bottom water oil reservoir or not according to a strong edge-bottom water oil reservoir defining standard. The problem that the standard for judging whether the edge water energy of an oil reservoir is strong or weak is not clear is solved, and normalized and standardized strong edge-bottom water oil reservoir judgment is realized. The method has the characteristics of being simple in principle, high in operability, effective and practical, and the like, and thus, has very good popularization and application values.

Strong edge-bottom water oil reservoir defining method

The invention discloses a stratification developing method for a complex fault block thin oil reservoir. The method comprises the steps that the structure of the oil reservoir to be developed and the magnitude of edge-bottom water oil reservoir energy are determined; on the basis of determining the structure, fine geological stratification is achieved, and development units are detailed to single sand bodies; on the basis of fine geological stratification, the reservoir properties of all the single sand bodies are evaluated, and the spacing layer distribution conditions and physical characteristics of all the single sand bodies are determined; on the basis of determining reservoir evaluation, the residual oil distribution law and residual recoverable reserves of all the single sand bodies are determined through development effect analysis; after the residual oil distribution law is determined, series of strata recombination boundaries of horizontal well deployment target layers and vertical well drilling reservoir are obtained by utilizing numerical simulation in combination with field experience; on the basis of determining the conditions, according to the stratification developing technology, well pattern overall planning and deployment are carried out, and the stratification developing scheme is complied. According to the stratification developing method, the usage degree of the oil reservoir reserves can be increased, the development effect of the oil reservoir can be improved, and the recovery efficiency of the oil reservoir is enhanced.

Huang Taiming

Papers

Stratification developing method for complex fault block thin oil reservoir