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Method for measuring average flow velocity of oil-water two-phase flow with ultrahigh water content

An ultra-high water-cut oil and ultra-high water-cut technology, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc., can solve the problems of low measurement accuracy, short measurement time, failure, etc., and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2021-06-04
NORTHEAST GASOLINEEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the average velocity of oil-water two-phase flow at an ultra-high water-cut level, which can solve the failure of common logging methods and the measurement accuracy caused by the increased viscosity of the produced fluid and serious sand production in ultra-high water-cut horizontal wells. Low and short measurement time problems, providing a reliable flow rate measurement method for the production of ultra-high water-cut oil wells

Method used

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  • Method for measuring average flow velocity of oil-water two-phase flow with ultrahigh water content
  • Method for measuring average flow velocity of oil-water two-phase flow with ultrahigh water content
  • Method for measuring average flow velocity of oil-water two-phase flow with ultrahigh water content

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Embodiment 1

[0041] refer to figure 1 and figure 2 , a method for measuring the average velocity of an oil-water two-phase flow at an extra-high water cut level, the measurement method comprising the following steps:

[0042] Step 1: Determine the optimal shape and material of the pulse heat source heater, and determine the minimum heating discharge voltage U of the pulse heat source heater for the ultra-high water content oil-water two-phase flow velocity measurement device 1 , reducing power consumption and enhancing measurement time;

[0043] The fiber grating background temperature detector is used to detect the background temperature of the initial fluid in order to establish the minimum discharge voltage of the pulse heat source, and the power of the pulse heat source heater should satisfy the following formula:

[0044] Q=PΔt≥c(ρπR 2 l)(T 1 -T 0 )

[0045]Among them, Q is the heating amount, P is the heating power, Δt is the heating time, c is the oil-water mixing specific he...

Embodiment 2

[0068] like image 3 As shown, the ultra-high water content oil-water two-phase flow velocity measurement device includes a pulse heat source heater 1, a fiber Bragg grating background temperature detector 2, a fiber Bragg grating temperature detector 3 and a measurement circuit 4; the pulse heat source heater 1, fiber Bragg grating background The temperature detector 2, the fiber grating temperature detector 3 and the measuring circuit 4 are arranged in sequence; the fiber grating background temperature detector 2 is installed at the entrance of the measuring device, and is used to detect the temperature of the oil-water two-phase flow fluid before heating; the said The heat source shape of pulse heat source heater 1 is cuboid, and its material is gold; Described fiber grating temperature detector 3 is made of two fiber grating temperature detector arrays, and each fiber grating temperature detector array is separated by radial interval It consists of n FBG temperature detec...

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Abstract

The invention belongs to the technical field of petroleum engineering, and particularly relates to a method for measuring the average flow velocity of oil-water two-phase flow with an ultrahigh water content. The method comprises the following steps of (1) determining the optimal shape and the optimal material of a pulse heat source heater, determining the lowest heating discharge voltage of the pulse heat source heater, and reducing power consumption so as to extend the measuring time; (2) collecting a temperature signal of the oil-water two-phase flow with the ultrahigh water content, and calculating the flowing time of the oil-water two-phase flow with the ultrahigh water content through different thermosensitive detectors; and (3) establishing a calculation model of the average flow velocity v of the oil-water two-phase flow with the ultrahigh water content. A device for measuring the flow velocity of the oil-water two-phase flow with the ultrahigh water content mainly comprises a pulse heat source, a fiber bragg grating background temperature detector, a fiber bragg grating temperature detector pair and a measuring circuit. The measuring precision of the flow velocity of the oil-water two-phase flow be increased, and the measuring duration of an instrument can be extended.

Description

Technical field: [0001] The invention belongs to the technical field of petroleum engineering, and in particular relates to a method for measuring the average velocity of oil-water two-phase flow at an ultra-high water content level. Background technique: [0002] The oilfield enters the late stage of development, and the liquid production presents the characteristics of high water cut and low flow rate. When the water cut is greater than 90%, the oilfield development has entered the ultra-high water cut development period. At this time, methods such as horizontal wells, chemical flooding and small wellbores are often used Enhanced recovery. The application of these new technologies improves recovery on the one hand, but also brings difficulties to production logging on the other hand. Using methods such as horizontal wells and chemical flooding leads to increased fluid viscosity and serious sand production, resulting in the failure or large error of commonly used flow rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/07
CPCE21B47/00
Inventor 韩连福郑朝亮付长凤杜琳琳刘兴斌牟海维谢荣华
Owner NORTHEAST GASOLINEEUM UNIV