Water drive reservoir natural water invasion, water injection and production balance state determining method

A technology of balance state and determination method, which is applied in the direction of instruments, data processing applications, calculations, etc., and can solve problems such as coordination and balance that are rarely involved and have no theoretical basis

Inactive Publication Date: 2016-11-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the issue of coordination and balance between natural water intrusion, artificial water injection and extraction production is rarely addressed
At the same time, the calculation of water injection volume is mostly based on empirical formulas, and there is no definite theoretical basis.

Method used

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  • Water drive reservoir natural water invasion, water injection and production balance state determining method
  • Water drive reservoir natural water invasion, water injection and production balance state determining method
  • Water drive reservoir natural water invasion, water injection and production balance state determining method

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Embodiment

[0119] The reservoir started to be put into production in April 1992. The original reservoir pressure was 21.86MPa, and the reservoir saturation pressure was 17.2MPa. Water injection began in August 1995. The energy of the natural water body in the reservoir is relatively sufficient, and the volume of the natural water body is about 35% of the reservoir volume. times, the current reservoir pressure is 19.84MPa, the total number of water injection wells is 17, the total number of production wells is 95, the ratio of injection-production wells is 0.179 (1:5.587), the recovery degree is 44.04%, and the comprehensive water cut is 79.83%, all oil wells have been pumped. According to the existing production history data, the relationship between the average single-well liquid production index and the average single-well water absorption index of the reservoir with water cut is as follows:

[0120] J L = 29.65 - ...

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Abstract

The invention discloses a water drive reservoir natural water invasion, water injection and production balance state determining method comprising the following steps: acquiring a reservoir average single-well fluid productivity index and a reservoir average single-well water injectivity index; acquiring the maximum bottom hole flowing pressure of the reservoir water injection well; determining the reservoir water injection rate, the reservoir water influx and the reservoir liquid production capacity; determining the relation of the natural water influx, water injection rate and liquid production capacity under the condition of production balance based on the principle of material balance; and drawing a water invasion, water injection and production balance curve based on the principle of material balance, and finding out the 'balance point' of the reservoir. According to the invention, the relational expression which must be met for the realization of stable output of a reservoir along with the increase in water content is calculated out, and a theoretical basis is laid for reservoir stable output analysis. The production pressure difference, average pumping well bottom hole flowing pressure and reservoir pressure level required for the realization of stable output of an instance reservoir in different water cut periods in the future under different well spacing densities and different injector-to-producer ratios are analyzed, and the result provides a technical support for efficient and reasonable development of water drive reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for determining the balance state of natural water intrusion, water injection and production in a water drive oil reservoir. Background technique [0002] Water injection is an important technology for reservoir development. For natural water drive reservoirs, the amount of water injected is closely related to the natural energy of the reservoir. In recent years, water injection development has been widely used in the process of oil reservoir development at home and abroad, and many scholars have conducted research on water injection development technology. For reservoirs with different natural energy conditions, the amount of water injection should also be different. The energy of natural water flooding should be fully utilized, and water should be injected rationally to increase the recovery rate and optimize the economic bene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/02
CPCG06Q50/02
Inventor 聂仁仕樊晓辉邓祺陈雄任婷王苏冉
Owner SOUTHWEST PETROLEUM UNIV
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