Pretest method for comprehensive water-containing residual oil engineering at polymer separate stage

A prediction method and staged technology, applied in earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as large prediction error and error accumulation

Inactive Publication Date: 2007-02-14
DAQING OILFIELD CO LTD
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Problems solved by technology

The whole process of numerical simulation adopts a mathematical model, there is error a

Method used

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  • Pretest method for comprehensive water-containing residual oil engineering at polymer separate stage
  • Pretest method for comprehensive water-containing residual oil engineering at polymer separate stage
  • Pretest method for comprehensive water-containing residual oil engineering at polymer separate stage

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Experimental program
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specific Embodiment approach 1

[0019] Specific implementation mode 1: In this implementation mode, according to the gradual advance of the polymer flooding slug leading edge, showing different dynamic change characteristics, the whole process of polymer flooding is divided into five stages, and a comprehensive water cut prediction model is established in stages.

[0020] The first stage is the initial stage of polymer injection in which a small polymer slug is advanced.

[0021] According to the empirical formula of Masquette, determine the relationship between the injection pressure rise and the injection volume:

[0022] Δp = Qμ P 2 πkh ln r p r w

[0023] The seepage law of the fluid in the small slug polymer solution area at the initial stage of polymer injection conforms to the g...

specific Embodiment approach 2

[0052] Specific implementation mode 2: Based on the above mathematical model, the comprehensive water cut in the whole process of the western eastern block of the North Second Zone of the Sabei Development Zone of Daqing Oilfield is predicted. The comparison results of numerical simulation results and oil field data are shown in figure 1 . The time for polymer injection mining in this block is about 8 years. The moisture content in the later period reaches about 95%, which belongs to the extremely high water content period. The water cut curve is relatively complete and experiences a brief water cut rise at the initial stage of polymer injection, a mid-term water cut first declines and then slowly rises, and a gentle rise in the subsequent water flooding stage. It can be seen from the figure that the numerical simulation results of the model are in good agreement with the field data.

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Abstract

An engineering stage-prediction method of oil deposit containing water in utilizing polymer displacement of reservoir oil sets up prediction model to reflect five stages of different mechanism in polymer displacement of reservoir oil such as preliminary period of polymer injection, effective period of polymer injection, stable production period with low water content, rerising period of water content and follow-up water displacement period according to water dynamics, oil deposit basic theory and on-site practical experience.

Description

technical field [0001] The invention belongs to the field of oil reservoir engineering, and is a reservoir engineering prediction method mainly researched on comprehensive water cut in different stages of polymer flooding. Background technique [0002] With the continuous expansion of industrialized production of polymer flooding and the completion of the whole process of polymer flooding in some blocks in Daqing Oilfield, a relatively mature set of polymer flooding development technology and adjustment methods has been formed, and a basic understanding of the change law of polymer flooding development indicators has been obtained. . The main work that has been carried out is to use the method of numerical solution to study the change law of polymer flooding production, and there are few studies on the derivation of basic theory. A mathematical model is used in the whole process of numerical simulation, and there is error accumulation, and the prediction error in the middle...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/22
Inventor 万新德方庆姜振海付青春卢洁
Owner DAQING OILFIELD CO LTD
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