Method and system for testing oil-gas-water profile of each section of horizontal well by using environmental protection type tracers

Abstract

The invention provides a method and system for testing the oil-gas-water profile of each section of a horizontal well by using environmental protection type tracers. The method comprises the steps that according to information containing the oil and gas reservoir type, the fracturing fluid type and the number of test sections, the kinds and the compositions of the chemical tracers are determined;the designed using quantity, the injection time and the injection velocity of the chemical tracer used at each section are determined; injection equipment of the tracers used for testing is determined, and the connecting process of equipment for completing on-site operation is determined and laid out before construction; injection operation of the corresponding chemical tracers required by construction sections is completed according to the designed pump injection procedure; after fracturing construction of the whole horizontal well is completed, continuous tracer test sampling operation is implemented according to the designed sampling time and frequency, and samples are tested in time after all sampling is completed; and a production profile map or a contribution ratio map of each layersection of the oil and gas reservoir horizontal well within the sampling period is drawn.

Description

technical field [0001] The invention relates to a method and a system for testing the oil-gas-water profile of each section of a horizontal well by using an environment-friendly tracer, which belongs to the technical field of petroleum exploitation. Background technique [0002] In recent years, with regard to the research on the effects of staged fracturing of horizontal wells in oil and gas reservoirs, those skilled in the art have always hoped to be able to clarify the effect of each stage of fracturing stimulation through various post-fracture evaluations. Previously, the more common post-fracturing evaluation methods in China are as follows: 1) Evaluate the effect of fracturing by analyzing the construction parameters and process rationality, and optimize the fracturing process, including the type and scale of fracturing fluid and proppant 2) Using microseismic monitoring of fracture distribution and extension state, and estimating the stimulation volume of each stage; ...

AI Technical Summary

Problems solved by technology

However, after comparing several commonly used chemical tracers such as radioactive tracers, dye macromolecular tracers, and fluorescent indicators, it was found that these chemical tracers can only trace production fluid (oil, water). Unable to realize gas production tracer

In addition, the radioactive tracer has a great impact on the environment, and it needs to pass the environmental assessment before it can be put into production; the dye macromolecular tracer is used in a large amount in monitoring, and there are a large number of bacterial encroachments, and there are large errors in qualitative evaluation and formation pollution. Hidden dangers; the fluorescent indicator monitors the presence of stratum adsorption and certain bacterial encroachment, and the error in qualitative evaluation is also large

[0007] Therefore, in order to solve the problems of long evaluation time span in the post-stage evaluation of horizontal well fracturing, high safety requirements and cost of downhole tools, difficulties in effective data acquisition and analysis, low matching degree between evaluation results and actual production, and inability to meet simultaneous quantitative It is difficult to analyze the production contribution of oil, gas, and water three-phase flowback in each layer, and it is urgent to propose a method for testing the oil, gas, and water profiles of each section of a horizontal well using an environmentally friendly tracer. The evaluation method is convenient, fast, safe and accurate to quantitatively analyze the test results of oil-gas two-phase, gas-water two-phase or oil-gas-water three-phase production profiles in each interval of horizontal wells, so as to deepen the analysis of horizontal well reservoirs. The understanding of the relationship with the stimulation effect facilitates the optimization of related process parameters (fracturing scale, perforation parameters, steering conditions, etc.) Trajectory characteristics of flat wells), strengthen the pertinence of horizontal well drilling, perforation, and reformation measures in the later stage, and further improve development programs such as geological engineering, fracturing engineering, and oil (gas) testing projects, so as to optimize the effect of oil and gas reservoir stimulation measures and economic benefit purpose

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