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A method for predicting stop-blowing time of self-flowing production wells in high water-cut stage in deep-water volatile oilfields

A production well, volatile technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve the problems such as the difficulty in determining the stop blowing time, the difficulty in predicting the water cut rise in production wells and the drop in wellhead pressure, etc. The method is simple, the calculation result is accurate, the line height is clear, and the principle is clear.

Active Publication Date: 2022-02-08
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for predicting the stop-blowing time of self-spraying production wells in the medium-high water-cut stage of deep-water volatile oil fields. And it is difficult to predict the law of wellhead pressure drop, and it is difficult to determine the stop time of spraying

Method used

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  • A method for predicting stop-blowing time of self-flowing production wells in high water-cut stage in deep-water volatile oilfields
  • A method for predicting stop-blowing time of self-flowing production wells in high water-cut stage in deep-water volatile oilfields
  • A method for predicting stop-blowing time of self-flowing production wells in high water-cut stage in deep-water volatile oilfields

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Effect test

Embodiment 1

[0072] Example 1. Method for Predicting Shutdown Time of Spontaneous Flowing Production Wells in High Water Cut Stage in Deepwater Volatile Oilfields

[0073] A method for predicting stop-blowing time of self-flowing production wells in the middle and high water-cut stage of deep-water volatile oilfields includes the following steps:

[0074] 1) Quantitatively evaluate the reservoir connectivity and reservoir heterogeneity of the target well based on seismic interpretation data and actual production dynamics data.

[0075] According to the knowledge of the reservoir, it is judged that the well A-01 belongs to the composite channel sedimentary reservoir, and the reservoir disconnection coefficient υ of the well A-01 is calculated according to formula Ⅰ.

[0076]

[0077] In formula Ⅰ, υ represents the reservoir disconnection coefficient, %; P r Indicates the original formation pressure, MPa; P rmin Indicates the minimum value in the process of formation pressure drop, MPa;...

Embodiment 2

[0110] The application verification was carried out in the field production of a deep-water volatile oil field in the Niger Basin of West Africa. The oilfield has a water depth of 1300-1700m, mainly composed of composite channel deposits, and locally developed lobe sand bodies, which belong to composite channel deposits. The formation fluid is volatile oil, the properties of the vertical fluid are slightly different, and the ground density of crude oil is 0.8g / cm 3 , the viscosity of formation crude oil is 0.21mPa·s. At present, some wells in the oilfield have entered the medium-high water cut stage, and the wellhead pressure has dropped significantly. By the end of 2017, two production wells had stopped blowout, and the risk of stopping blowout in the remaining medium-high water-cut wells is increasing.

[0111] By calculating and accurately predicting the stop flow time of each production well in the medium and high water cut stage of the oilfield, 4 production wells A-06 / 1...

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Abstract

The invention discloses a method for predicting the shut-down time of a self-spraying production well in the high water-cut stage of a deep-water volatile oil field. It includes the following steps: collecting seismic interpretation data of deep-water oilfields and measuring the actual production performance data of deep-water oilfields, evaluating the degree of reservoir connectivity and heterogeneity of target wells; Prediction model; then, according to the establishment of the prediction model of wellhead pressure drop law of production wells in the middle and high water cut stage under different reservoir characteristics of deep-water oilfields, and then according to the lower limit of production well wellhead pressure, the stop blowout time of production wells can be calculated. According to the injection stop time obtained by the above method, the timing of the production well pressure mode conversion is determined, and the maximum oil increment after the pressure mode conversion is estimated to amplify the production pressure difference. The invention can be used to solve the problems that it is difficult to predict the regularity of water content rise and wellhead pressure drop in production wells and the time to stop spraying is difficult to determine during the self-spraying production process of deep-water volatile oilfields in the medium-high water-cut stage.

Description

technical field [0001] The invention relates to a method for predicting stop-spray time of self-spraying production wells in the middle and high water-cut stage of deep-water volatile oil fields, belonging to the field of oil and gas exploitation. Background technique [0002] The crude oil lifting, transportation and processing systems in the development of deepwater oilfields are very complex, and there are strict requirements on the pressure limit at each node of the pipeline, especially the lower limit of the wellhead pressure of production wells. Due to the influence of high water cut, the pressure loss in the wellbore increases day by day during the lifting of crude oil, the wellhead pressure drops sharply, and the flow safety problem in the pipeline becomes prominent. , the development of deepwater oilfields requires accurate prediction of the risk of stop flow of high water cut wells to achieve early prevention and timely adjustment, so as to achieve the purpose of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B47/06G06Q50/02
CPCG06Q50/02E21B47/00E21B47/06
Inventor 康博韬顾文欢杨宝泉杨莉张迎春苑志旺陈筱张昕郜益华杨希濮段瑞凯陈国宁李晨曦张旭翟迪
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD