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Tight oil reservoir horizontal well post-fracturing segmented well testing analysis method based on fracturing tracing constraints

A technology for tight oil reservoirs and analysis methods, which is applied in the field of staged well testing analysis after horizontal well pressure in tight oil reservoirs, can solve the problems of single acquisition parameters and inability to realize quantitative characterization of fractures, so as to reduce polysolution and reduce monitoring costs. , the effect of reducing interpretation bias

Active Publication Date: 2021-04-23
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

After in-depth research, it is found that the fracturing tracer monitoring technology is one of the important means of formation production evaluation. It is of great significance in estimating the fracture conductivity and evaluating the efficiency of staged fracturing, but it cannot realize the analysis of fractures. Quantitative characterization and acquisition of parameters are relatively simple; well testing can obtain more parameters, determine well production capacity, and study reservoir parameters and reservoir performance. The interpretation results have more uncertainty and multi-solution

Method used

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  • Tight oil reservoir horizontal well post-fracturing segmented well testing analysis method based on fracturing tracing constraints
  • Tight oil reservoir horizontal well post-fracturing segmented well testing analysis method based on fracturing tracing constraints
  • Tight oil reservoir horizontal well post-fracturing segmented well testing analysis method based on fracturing tracing constraints

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Embodiment

[0080] Based on the above-mentioned method of the present invention, for a horizontal well test analysis after fracturing of a certain homogeneous box-type tight oil reservoir, the multi-stage fracturing horizontal well of the homogeneous box-type tight oil reservoir has a length of 800 m and a radius of 0.0878 m, the thickness of the oil layer is 16.15m, the porosity is 0.15, the viscosity of crude oil is 1.6mPa·s, the volume factor is 1.2, and the comprehensive compressibility factor is MPa -1 , a total of 4000 hours of production, including 600 hours of shut-in testing. The horizontal well underwent multi-stage fracturing to form two fractures with a spacing of 100m.

[0081] According to step 1, the production change history of each research section of the reservoir can be obtained, and the obtained production change history is processed into a production determination problem by using the deconvolution function in the well testing software, and then the box-type homogeneo...

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Abstract

The invention discloses a tight oil reservoir horizontal well post-fracturing segmented well testing analysis method based on fracturing tracing constraints, which comprises the following steps: in the fracturing process, obtaining concentration extraction curves of different tracers of ground flowback, and further obtaining variable production data; converting the obtained variable production data in each section of the horizontal well into fixed production data by utilizing a fracturing tracer flow interpretation model under the deconvolution constraint; determining a single infinite and limited flow guide vertical fracture horizontal well test model based on the fracturing tracing constraint by utilizing the fixed production data, and obtaining stratum parameters of each section of the horizontal well by utilizing the single infinite and limited flow guide vertical fracture horizontal well test model based on the fracturing tracing constraint; and according to the obtained stratum related parameters of each section of the horizontal well, drawing an output condition graph of each section of the oil reservoir horizontal well, calculating the contribution rate of each section of the horizontal well and obtaining stratum information of the whole section of the horizontal well. According to the method, the limitation of a conventional single monitoring means is overcome, and combined constraint explanation of multiple monitoring means is realized.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to a segmented well test analysis method for horizontal wells in tight oil reservoirs after fracturing based on fracturing trace constraints. Background technique [0002] Tight oil and gas resources in my country have the characteristics of wide distribution, large reserves, great potential and broad prospects. After the research and exploration of many scientific and technical personnel, technologies such as horizontal well staged fracturing have become powerful tools for the development of such oil and gas fields, and an important way to improve the recovery rate of oil and gas fields and the comprehensive benefits of oil field exploration and development. After the large-scale reconstruction of the reservoir, it is necessary to scientifically formulate a reasonable production system and maximize benefits by accurately and effectively obtaining the half-length of the fracturi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/15
CPCG06F30/20G06F17/15Y02A10/40
Inventor 周德胜张洋严乐范鑫刘畅景成
Owner XI'AN PETROLEUM UNIVERSITY
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