A Method for Identifying Advantageous Channels in Secondary Development of Mature Oilfields

Abstract

The invention discloses a preferential channel identification technology for the secondary development of a mature oil field. The technology comprises the following technical steps of 1, oil deposit area substance streamline simulation phase, wherein the phase focuses on the comprehensive analysis of the oil deposit, particularly the dynamic description and research phase of the four-dimensional oil deposit; and 2, modeling on the preferential channel identification technology for the secondary development of the mature oil field, specifically including fine geologically modeling, processing by using dynamic heterogeneous model and establishing a comprehensive adjustment and development scheme; the specific processes are as shown in figure 1. The technology provided by the invention is unique and novel in theory, applicable to the secondary development of the old producing area, in particular applicable to the secondary oil exploitation of the oil field in northeast and other old industrial bases, and is accurate and reliable; the technology provided by the invention can play a role in decreasing cost and increasing benefit, and in particular applicable to the deflationary environment with continuously decreased international oil price and gloomy economy.

Description

technical field [0001] The patent of the present invention relates to the secondary development of mature oilfields, that is, the technical field of secondary oil exploration. The focus of the secondary development of mature oilfields and secondary oil exploration should be to focus on the water injection under-swept area and the flow-around area in the reservoir in three dimensions. The distribution of space and the search and treatment of dominant seepage channels, the former directly proposes the potential strip (potential area) for secondary oil exploration, while the latter provides the water channeling strip (injection invalid circulation area) that needs to be treated; in normal Under reservoir conditions, the two have a relatively close correlation and influence each other, but identifying the latter—that is, the identification of the dominant seepage channel in three-dimensional space has more practical application value and more benefit, especially one of the mature m...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, the traditional oilfield development application is too single, or the block is large and average, which makes the concept and technology of the reservoir too simple in the dynamic description. The existing technology emphasizes the vertical reservoir homogeneity To connect a certain high-permeability layer of one well directly with the high-permeability layers of other wells, logically, one dimension plus one dimension equals three dimensions, but in fact one dimension plus one dimension is still one dimension, because you only see And concentrate on studying the one-dimensional data of one wellbore, and the one-dimensional data of one wellbore for two-bit one well is still the same type of one-dimensional data of one wellbore. With the basic conditions and material basis for stable comparison, this is the conventional technology that is widely used now; and there are still some obvious defects in the current commonly used technology:

[0005] Therefore, the conventional reservoir description method emphasizing static parameters is severely restricted, and the implementation is difficult and the deviation will be relatively large. The lateral and even vertical division of reservoirs; the study of reservoir architecture is extremely difficult, these are serious challenges to the accuracy of geological modeling based on static reservoir description, and there may be many reasons for this, here we focus on the following two Some important deficiencies:

[0006] First, the limitation of the calculation method: it is due to the "innate" complexity of the above-mentioned petrogenesis, which increases the uncertainty of the calculation results; while the existing method is based on a single static reservoir description method, and for the test The physical properties of inter-well reservoirs and even the geological complexity of reservoir distribution, the calculation method is also greatly reduced;

[0015] Second, strong reservoir heterogeneity will inevitably lead to the early formation of dominant seepage channels in the reservoir, and the flow velocity of local fluid must be relatively high, and the numerical model software based on finite difference (FD) can calculate the high water cut period of the reservoir. , there will be an obvious problem of non-conservation of matter, and the obtained pressure field and saturation field will be distorted. The conclusions drawn on this basis will often be inconsistent with the actual reservoir performance. Many reservoirs have Closely related problems and puzzles cannot be unanswered in reservoir numerical simulation;

[0016] To sum up, since the vast majority of domestic continental basin reservoirs have one or another problem in development, but the existing reservoir simulation technology can not provide the answer, it must be said that some current ideas of reservoir research and numerical simulation There are also such and such problems that need to be studied and solved urgently; it can be seen that it is just the right time to introduce and invent a superior channel identification method for the secondary development of mature oilfields, and to suggest new reservoir research techniques and methods;

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