Method for recognizing type of fluid flowing into well

A technology of fluid type and identification method, applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problem of lack of hydraulic calculation error of the type of fluid entering the well, and achieve the effect of wide identification range, high identification accuracy and strong identification ability.

Active Publication Date: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for identifying the type of fluid entering the well, so as to solve the problem that the current lack of identification of the type of fluid entering the well leads to errors in hydraulic calculations

Method used

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  • Method for recognizing type of fluid flowing into well
  • Method for recognizing type of fluid flowing into well
  • Method for recognizing type of fluid flowing into well

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] The invention evenly stirs the fluid entering the well, uses a viscometer to measure the degrees of the fluid entering the well at different rotation speeds, and then converts them into shear rate and shear stress and standardizes them into fuzzy vectors to obtain the rheological parameters of various types of fluids. And calculate the shear stress and standardize it, and then calculate the closeness between the measured shear stress fuzzy vector and the shear stress fuzzy vector calculated by each fluid. type identification.

[0038] The identification process of the well-entry fluid type of the present invention is described in detail below in conjunction with the measured data of the HH42P10 well of a certain oil field. The drilling fluid used in the drilling process of this well is potassium amino, and the specific process is as f...

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Abstract

The invention relates to a method for recognizing type of fluid flowing into a well, and belongs to the technical field of oil and gas well drilling and well completion. The method comprises the following steps: measuring viscosity of to-be-recognized fluid flowing into the well at different revolving speeds at first and converting the viscosity into shearing rate and shearing stress; calculating rheological parameters of types of various fluids and calculating shearing stresses corresponding to the types of the various fluids under the various actually measured shearing rates according to a rheological equation of the fluids; respectively carrying out standard treatment on the shearing stress of the to-be-recognized fluid and the shearing stresses corresponding to the types of the various fluids and establishing a corresponding fuzzy vector; and calculating close degrees, comparing the close degrees, and taking the fluid corresponding to the maximum close degree as the type of the to-be-recognized fluid. A common rotational viscometer is used for measuring data, and through calculation of the close degrees, the type of the fluid flowing into the well is recognized. The method has the advantages of high recognition capability, wide recognition range, high recognition accuracy and the like, and has quite important significance on hydraulic calculation and rheological parameter control.

Description

technical field [0001] The invention relates to a method for identifying the type of fluid entering a well, and belongs to the technical field of oil and gas drilling and well completion. Background technique [0002] In the field of oil and gas drilling and completion technology, drilling fluid is required to transfer hydraulic energy, carry cuttings and balance formation pressure; during the completion operation, cement slurry needs to be injected into the annular space between the wellbore and the casing for cementing operations ; During the stimulation operation, the fracturing fluid needs to transmit hydraulic energy, carry proppant into the formation, and realize the stimulation of low-permeability oil and gas reservoirs. Drilling fluid, cement slurry, and fracturing fluid are plastic fluids and pseudoplastic fluids in non-Newtonian fluids, which can be divided into Bingham fluid, power-law fluid, Cason fluid, Heba fluid, R-S type fluid and L-M type fluid etc. Among ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 闫吉曾邓红琳王翔王健陈晓华梅洁
Owner CHINA PETROLEUM & CHEM CORP
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