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Ultra-low permeability tight oil reservoir horizontal well waterflooding response degree quantitative evaluation method

A quantitative evaluation and tight oil reservoir technology, applied in instrumentation, technical management, data processing application, etc., can solve the problem that the effectiveness judgment standard is difficult to popularize the effectiveness of horizontal wells and the analysis of effectiveness degree.

Active Publication Date: 2017-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above difficulties make it difficult to extend the effectiveness judgment standard based on the morphological characteristics of the production curve of directional oil wells to the analysis of the effectiveness and degree of effectiveness of horizontal wells

Method used

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  • Ultra-low permeability tight oil reservoir horizontal well waterflooding response degree quantitative evaluation method
  • Ultra-low permeability tight oil reservoir horizontal well waterflooding response degree quantitative evaluation method
  • Ultra-low permeability tight oil reservoir horizontal well waterflooding response degree quantitative evaluation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a quantitative evaluation method for the effective degree of water injection development of horizontal wells in ultra-low permeability tight oil reservoirs, which is characterized in that it includes the following steps:

[0064] Step 1: Select a block, and count the single well cumulative oil production Q and single well daily oil production q of horizontal wells developed by water injection at different time points;

[0065] Step 2: Calculate the accumulated oil production per unit length Q' and the daily oil production per unit length q' of the water injection development horizontal wells at different time nodes according to the statistical results of the first step;

[0066] Step 3: Determine the cumulative oil production per unit length Q' and the daily oil production per unit length q' when horizontal wells in the same block are not supplemented with other energy, respectively, as the lower limit Q' of cumulative oil production for quantita...

Embodiment 2

[0070] This embodiment describes the steps in Embodiment 1 in detail. The cumulative oil production per unit length Q' and the daily oil production per unit length q' of horizontal wells under water injection development at different time points in Step 2 are obtained by the following formulas:

[0071] Generally recommended unit length is 100m, then:

[0072]

[0073]

[0074] Among them, Q is the cumulative oil production of a single horizontal well at different time nodes, t;

[0075] Q' is the cumulative oil production per unit length of horizontal wells at different time nodes, t / 100m;

[0076] q is the daily oil production of a single horizontal well at different time nodes, t / d;

[0077] q' is the daily oil production per unit length of horizontal wells at different time nodes, (t / d) / 100 meters;

[0078] L is the length of the horizontal section of the horizontal well.

[0079] Step 3 In order to determine the effective degree of horizontal wells, quantitativel...

Embodiment 3

[0117] This embodiment describes the present invention in detail in conjunction with specific implementation data.

[0118] There are 83 horizontal wells in a block of Huaqing Chang 6 that have been put into production for more than 36 months, including 8 natural energy horizontal wells and 75 water injection development horizontal wells. It can be seen that there are many horizontal wells in production, so when calculating water injection When developing the upper and lower limits of the effective degree, the method of field practice is adopted. In order to give an example more clearly, 4 horizontal wells for water injection development were randomly selected to evaluate the effectiveness of water injection development.

[0119] Step 1: Take the month as the time node, and count the cumulative oil production Q and daily oil production q of the 4 water injection development horizontal wells in different months of Huaqing Chang 6, as shown in Table 1 below.

[0120] Table 1

...

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Abstract

The difficult problem that a conventional response judgment standard based on a directional oil production well yield curve shape feature is hard to be promoted to analysis on a horizontal well response and a response degree is overcome, two parameters of horizontal well unit length cumulative oil production and unit length daily oil production are introduced, a value-added method with the horizontal well unit length cumulative oil production and the unit length daily oil production through natural energy development in the same reservoir as lower limits, with the horizontal well unit length cumulative oil production and the daily oil production through waterflooding as upper limits and with the unit length cumulative oil production and the unit length daily oil production applied comprehensively is provided, quantitative evaluation on different horizontal well waterflooding energy supplementation response degrees can be realized, and an important basis is provided for optimization of a development technical policy.

Description

technical field [0001] The invention belongs to the field of oil field development, and in particular relates to a method for quantitatively evaluating the effective degree of water injection development of horizontal wells in ultra-low permeability tight oil reservoirs. Background technique [0002] With the increasingly prominent contradiction between the world's oil supply and demand and the gradual shortage of high-quality oil resources, the development of ultra-low permeability tight oil resources (surface air permeability is less than 1.0mD) has become a new topic for the development of my country's oil industry. Practice shows that horizontal well water injection is an effective way to develop this type of reservoir. The formation pressure coefficient of foreign tight oil reservoirs is high (the formation pressure coefficient is greater than 1.2), and the formation crude oil viscosity is low. Basically, long horizontal section horizontal well depletion is used for prod...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/02
CPCG06Q10/0637G06Q10/0639G06Q50/02Y02P90/82
Inventor 樊建明屈雪峰王冲雷启鸿成良丙
Owner PETROCHINA CO LTD
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