Predication method for spray-stopping stratum pressure of oil well

A technology of formation pressure and prediction method, applied in prediction, instrument, data processing application, etc., can solve the problem of not considering the influence of water cut on the oil well production index and inflow curve, the unclear physical meaning of mathematical statistical methods, and the limited scope of application and other issues, to achieve the effect of perfect influencing factors and theoretical basis, clear physical meaning and wide application range

Active Publication Date: 2017-12-05
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Among them, the physical meaning of the mathematical statistical method is not clear, and limited by the statistical sample points, the scope of application is limited
In addition, in the process of predicting the formation pressure without injection using the nodal

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  • Predication method for spray-stopping stratum pressure of oil well
  • Predication method for spray-stopping stratum pressure of oil well
  • Predication method for spray-stopping stratum pressure of oil well

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0033] The method for predicting the formation pressure of oil well stop blowout provided by the present invention comprises the following contents:

[0034] 1. Establish a node analysis model of a typical gushing oil well production system.

[0035] Such as figure 1 As shown, the present invention adopts four kinds of node components including well completion section, node analysis point, node and oil nozzle, and two kinds of connecting components such as connection line and oil pipe, selects the bottom of the well as the calculation node, and establishes a node analysis model of a typical self-spraying oil well production system, The specific establishment process i...

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Abstract

The invention relates to a predication method for spray-stopping stratum pressure of an oil well. The method is characterized by including the following contents: 1) establishing a typical flow oil well production system node analysis model; 2) calculating oil and water two-phase relative permeability Krw, Kro and a zero dimension fluid collection index JDL, and obtaining an oil and water two-phase relative permeability curve and a zero dimension fluid collection index curve; 3) on the basis of a fluid collection index PI0 when a water content of an oil well is 0 and the zero dimension fluid collection index curve, calculating different water contents of nodes in the well and inflow curves in different stratum pressure conditions; 4) on the basis of the minimal output pressure PDSCmin needed by crude oil in the mouth of the well, calculating outflow curves of the nodes in the well in different water content conditions; and 5) on the basis of the inflow curves and the outflow curves of the nodes in the well, determining a critical spray-stopping state of the oil well, and calculating the critical spray-stopping stratum pressure Pc of the oil well.

Description

technical field [0001] The invention relates to a method for predicting formation pressure of an oil well without blowout, and relates to the technical field of oil field development. Background technique [0002] The prediction of the formation pressure of the oil well without blowout is an important factor for determining the production capacity construction scale of the oilfield and changing the lifting mode of the oil well on a large scale. Therefore, it is of great significance for the accurate prediction of the formation pressure of the oil well without blowout. [0003] At present, in the prior art, some experts and scholars have used methods such as mathematical statistics and node analysis to predict oil well blowout stop pressure. Among them, the physical meaning of the mathematical statistical method is not clear, and is limited by the statistical sample points, so the scope of application is limited. In addition, when using the nodal analysis method to predict f...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 李长勇蒋百召唐莎莎孙立春何娟皮建康博韬李竞刘广为陈培元齐明明王峙博
Owner CHINA NAT OFFSHORE OIL CORP
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