A method of evaluating the effectiveness of usedcolors of oil production technologies

 

(57) Abstract:

The invention relates to petrochemistry, namely the method of evaluating the efficiency of usedcolors technologies of oil production at the late stage of field development, and is intended for use in the oil industry. Object of the invention is the expansion of the means. The inventive method includes the selection of surface oil samples stabilization of oils, determination of the values of density, viscosity and content of the fraction with a boiling point up to 200°C and the comparison of these values for crude oils from the same wells before and after applying usedcolors compositions. If the oil is characterized by the original or slightly modified properties compared with oil before exposure, the applied technology provides coverage of the formation water, or selective isolation of the developed layer and connecting previously adrenergenic less permeable zones of the same layer or a new layer. table 1.

The invention relates to petrochemistry, namely the method of evaluating the efficiency of usedcolors technologies of oil production at the late stage of field development, and is intended to use oblama improve the efficiency of their development, which is successfully solved by the influence of the reservoir through injection wells sediment-gel-making technology that allows you to change the direction of filtration flow, thereby increasing the coverage of the reservoir water flooding or selectively isolating the produced layer.

Known methods of selection operating section intervals in producing and injection wells by analysis of oil from producing wells. These include the method of photocalorimetry oil and determine the content of trace components [1. Guidance on the application of geological and geophysical, hydrodynamic and physico-chemical methods for control of oil field development. RD 39-4-699-82, S. 36-41, the Ministry of oil industry No. 227 dated may 6, 1982]. The value of absorption coefficient (PSC) is associated with the content in oil of resin-asphaltene substances. However, this method cannot be used if there is not sufficient material to form a reasonable picture of the distribution of the PSC area deposits in each of the layers of the multilayer object at the beginning and the process of its development. It is not always applicable even to the adjacent layers, not to mention the separate areas of the same layer. T is the INIC, and the oil reservoir S from 120 to 310 units.

The objective of the invention is a new and expanding Arsenal of known methods, the method of evaluating the efficiency of usedcolors of oil production technologies based on the analysis of physico-chemical properties of oils taken well by the way.

The problem is solved by the proposed method of assessing the effectiveness of usedcolors technology oil production by comparing the density and viscosity of the oil, as well as the content of fractions from the initial boiling point (N. K.) up to 200°C in oil selected from the wellhead area before and after treatment injection wells sediment-gel-making structure. The decrease in the values of density, viscosity oil, the increase of the content of boiling fraction of the oil from these wells after treatment injection wells speaks about involvement in the development of new previously adrenergenic zones of the layer or new layer to the plot, controlled this injection wells.

The essence of the invention consists in the following. In the process of flooding of the site are developed, as a rule, the most permeable layers and zones of terrigenous reservoir. In the preferred filtering them the most light and the least polar is anilis its physico-chemical properties: the oil from producing wells area increased density, viscosity, the content of total sulphur and decreased the share of boiling hydrocarbons. The values of these parameters characterize the properties of the oils selected from the wellhead area before applying it sediment-gel-making technology.

After application of sediment-gel-making technology, we have established that in some cases the oil extracted from the same wells, changed its properties. This allowed to conclude that if the oil is characterized by an initial or virtually unaltered properties compared with oil before exposure, the applied sediment-gel-making technologies have increased the coverage of the reservoir water flooding, or selectively insulated developed layer, resulting in the development of joined earlier adrenium, less permeable zones of the same layer or a new layer.

Before the implementation of works on the use of the analyzed sediment-gel-making technology, in the area consisting of injection wells are within the area of influence of wells, at the mouth of the wells sampled oil sample and for each of them are determined by the density, viscosity and the content of the boiling hydrocarbons N. K. - 200°C. the Obtained parameter values characterizability period of time, necessary for the manifestation of the effect of pumping sediment-gel-making structure, at the mouth of the wells plot again selected samples of oils and analyzed their properties. Oil, in the case involving new reserves, characterized in average area smaller values of density and viscosity, as well as higher content of boiling hydrocarbons. In the absence of the effect of the application of the analyzed technologies on the site and a possible cut-off of oil reserves average values of parameters of oil remain the same. The sum of the data defining parameters for multiple sites, it is concluded that the efficiency of the technology used for enhanced oil recovery.

In the literature there is no information about the use of this method of evaluating the effectiveness of usedcolors technologies of oil production, therefore the proposed method of assessment is new.

From the literature did not follow that such a method of evaluating the effectiveness of usedcolors of technologies used to increase oil production, based on the difference in the physico-chemical properties of oils before and after treatment injection wells sediment-gel-making structure will be such characteristic is breathalyse level.

This invention is illustrated by the following examples (table) specific for its use in the Romashkinskoye field handling sites injection wells high modulus liquid glass [2. RF patent № 2154159 Ways of development of an oil field (options). Bulletin no. 22, 2000]. The object of development are long-developing layers pashian horizon (1) on sites of injection wells 18834, 13682, 9671, 2791 and 8561. Each injection well control three or four producing wells. At the mouth of wells each plot sampled oil. After stabilization of oils defined parameters: density, viscosity and the content of the boiling hydrocarbons N. K. - 200°C, for which we calculated the average values of oil for site injection wells prior to the application of technology.

Buffer, and then process the solution of high modulus glass pumped into the injection well cycles from one to five based 1-10 m31 m perforated part of the reservoir. After the end of each cycle of the injected aqueous solution of mineral salts with ionic strength from 0.28 to 5.8. Six months after the treatment of injection wells on Astley and obessolivanija defined parameters: density, the viscosity and the content of the boiling hydrocarbons N. K. - 200°C, for which we calculated the average values of oil for site injection wells after the application of technology.

The application of the technologies under consideration was a reduction of the average values of density and viscosity, as well as the increase of the content of boiling fraction for oil produced from wells that are related to the zone of influence of injection wells 18834, and 13682 9671 (the first group of sections). For oils with sites injection wells 2791 and 8561 (the second group of sections) of the values of these parameters are essentially unchanged. As the data table for the first group of sections is observed additional oil production, and for the second it is not.

The validity of the results is tested using obtained based on the ratio of content in the oil of low molecular weight and high molecular weight paraffin hydrocarbons by gas chromatography coefficient Z=H(C13-C15)/H(C25-C27), allowing to determine the subtype of oil. For subtype oils I Z equals 3-8 is unmodified oil. In the process of oil extraction from subtype I is converted to the subtype II, for which Zn is vain 18834, 13682 and 9671 selected from the washed parts of the reservoir, as it is, judging by the Z-value is changed, and after it is taken unmodified oil, indicating that the effective application of the technology in question. Oil from the sites of injection wells 2791 and 8561 before application of the technology selected from slaboproudych parts of the reservoir, as it refers to an unmodified subtype oils. After its application subtype of oil taken from these sites has not changed.

The advantage of the proposed method of assessing the effectiveness of usedcolors of oil production technologies, based on the available methods of analysis of oils is no need in continuing expensive works on creation of a database of properties of oils, changing in the process of development, the area of the whole field and in each of its layers, the more that it cannot contain the properties of oils from not developed layers and zones of the reservoir, which will only be activated after the application of sediment-gel-making technology.

Industrial applicability of the proposed method of assessing the effectiveness of usedcolors of oil production technologies proven on the squares nave way and expands the Arsenal of known methods, evaluating the effectiveness of enhanced oil recovery methods.

A method of evaluating the effectiveness of usedcolors technologies of oil production, including the selection of surface oil samples stabilization of oil, the determination of the values of density, viscosity and content of the fraction with a boiling point up to 200°C and the comparison of these values for oil from the same wells before and after applying usedcolors compounds and, if the oil is characterized by the original or slightly modified properties compared with oil before exposure, the applied technology provides coverage of the formation flooding or selective isolation of the developed layer and connecting previously adrenergenic less permeable zones of the same layer or a new layer.

 

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