Method for monitoring communication state of steam flooding wells and system

Abstract

The invention provides a method for monitoring communication states of steam flooding wells and system. The method for monitoring the communication state of the steam flooding wells comprises the following steps: performing pulse well trail testing on a steam flooding well group, wherein the pulse well testing process is well testing process for performing periodic adjustment on steam injection output of a steam injection well; in the well testing process, the steam injection well is an excitement well, and a production well is an observation well; according to temperature and pressure variations of mouths of the production well and the steam injection well in the pulse well testing process, performing qualitative evaluation on communication of the steam injection well and the production well; and establishing mathematic models, achieving quantitative splitting of steam amounts of the steam injection well and corresponding production well, thereby performing quantitative evaluation upon the communication states of steam flooding, injection and production wells. By adopting the scheme of the invention, on the basis of monitoring upon conduction and diffusion of substances and energy under formation conditions, practical effects of stream to oil wells under the formation conditions can be directly reflected, and thus conclusions are direct and reliable.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, and in particular relates to a method and a system for monitoring the communication status between steam flooding wells. Background technique [0002] Steam flooding is a common development method for heavy oil reservoirs. Heavy oil steam flooding generally adopts a reverse nine-spot well pattern, that is, a steam flooding well group includes a steam injection well in the center, and 8 effective wells (production wells) around it; A steam well may affect multiple production wells at the same time, and a production well may also be affected by multiple steam injection wells at the same time, resulting in complex relationships between injection and production wells for steam flooding. It is necessary to accurately analyze and understand the relationship, interconnection and degree of influence between injection and production wells is very difficult. [0003] At present, the commonly used re...

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Problems solved by technology

Interwell tracer monitoring is the direct monitoring of material flow, which is mainly used in the development of thin oil water injection; in recent years, high temperature tracer technology has been developed for steam flooding; Therefore, the simultaneous implementation and application of gas and liquid tracer substances must be considered; due to the complex steam state of formation conditions, it is difficult for a single tracer substance to truly track the material streamline; at the same time, because the produced fluid is at high temperature and pressure, Wellhead sampling is prone to flash evaporation, which has a direct impact on the results of tracer substances in different phases, so the application of cross-well tracer testing is greatly limited

In the microseismic monitoring method, the inversion reliability of ground monitoring data is poor due to reasons such as stratum absorption and complex propagation paths, and this technology is rarely used.

At present, the understanding of steam flooding wells is mainly based on the analysis of development dynamic data. Due to the many factors affecting production parameters, the correlation is complicated, and the production data is not collected in time and the reliability is poor, which directly affects the analysis results. Therefore, this method generally only Rough qualitative results can be obtained

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