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Application method of water injection well whole shaft tubular column dissolved oxygen corrosion simulation device

A technology of corrosion device and application method, applied in isolation devices, wellbore/well components, chemical instruments and methods, etc., can solve problems such as difficulty in simulating dissolved oxygen corrosion behavior, and achieve reduced experimental cost, good repeatability, and reduced experimental effect of time

Active Publication Date: 2021-11-19
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the cost and time of the experiment, the existing experimental devices and methods often only carry out oxygen corrosion simulation for a limited set of experimental parameters selected to obtain the corrosion rate of the pipe string under the temperature and pressure conditions of certain specific well depths.
At the same time, the existing experimental devices and methods are difficult to simulate the dissolved oxygen corrosion behavior in the closed pipe string hundreds to thousands of meters downhole of water injection wells considering the corrosion consumption

Method used

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  • Application method of water injection well whole shaft tubular column dissolved oxygen corrosion simulation device
  • Application method of water injection well whole shaft tubular column dissolved oxygen corrosion simulation device
  • Application method of water injection well whole shaft tubular column dissolved oxygen corrosion simulation device

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Experimental program
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Embodiment

[0050] A method for evaluating the dissolved oxygen corrosion of the whole wellbore string of a simulated water injection well, comprising the following steps:

[0051] Step 1: According to the pressure p(h) and temperature T(h) of the downhole water injection string at any well depth h, the pressure-time data p(t) of the test nitrogen pressure reducing valve controller 4 is converted by formula (1) And the temperature-time data T(t) of the electric heating controller 17.

[0052]

[0053] In the formula: t is the experiment time, min; Q is the daily discharge of injected water, m 3 / d; h is any well depth, m; d is the inner diameter of water injection string, mm; V 1 is the volume of the pipe section below the annular partition 13d of the liquid storage riser, L; V 2 is the volume of corrosion test pipe section 36, L; V 3 is the volume of the upper horizontal pipe 18, L; V 4 is the volume of the lower horizontal pipe 20, L; V 5 is the volume of the upper L-shaped pipe...

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Abstract

The invention provides an application method of a water injection well whole shaft tubular column dissolved oxygen corrosion simulation device. The water injection well whole shaft tubular column dissolved oxygen corrosion simulation device comprises a liquid storage vertical pipe (13), an air injection system, a nitrogen pressurization system, an electric heating system, an aeration circulation system, a dissolved oxygen monitoring system, a corrosion reaction circulation system and an experiment auxiliary control system. According to the corrosion evaluation method, the function relation between the well depth and the experiment time in the water injection process is established, the water injection well whole shaft tubular column dissolved oxygen corrosion rate is calculated through one-time experiment data in combination with the corrosion electrochemical theory, the experiment frequency is greatly reduced, and the experiment time and the experiment cost are remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of integrity and safety of wellbore pipe strings of water injection wells, and in particular relates to an application method of a dissolved oxygen corrosion simulation device for full wellbore pipe strings of water injection wells. Background technique [0002] Water injection development is the main method to improve oil recovery. Due to the high dissolved oxygen content of injected water, high salinity, large water injection displacement, and high temperature and high pressure underground, after long-term water injection operations, the underground water injection string is severely corroded by dissolved oxygen. As a result, the failure of the pipe string occurs frequently, and the workover period is shortened, which seriously affects the safety of the wellbore of the water injection well and the overall benefit of the water injection development of the oilfield. [0003] In the process of water injection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B43/20E21B43/16E21B43/18E21B36/04F04B43/12F04B49/06C02F7/00C02F103/06
CPCE21B47/00E21B43/20E21B43/168E21B43/18E21B36/04F04B43/12F04B43/0081F04B49/06C02F7/00C02F2103/06Y02W10/10
Inventor 许红林杨小辉杨斌彭念
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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