Oil-gas well shaft corrosion simulation evaluation system

A technology for simulation evaluation and wellbore, which is applied in wellbore/well components, measurement, earthmoving, etc., can solve problems such as poor authenticity, and achieve the effect of easy assembly, simple simulation process, and data collection.

Pending Publication Date: 2020-04-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor authenticity of evaluation results in the above-mentioned prior art, and can only perform corrosion simulation simply, and provide a simulation evaluation system for wellbore corrosion of oil and gas wells

Method used

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  • Oil-gas well shaft corrosion simulation evaluation system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Dynamic corrosion inhibitor screening and evaluation test: store the field water sample in the liquid storage tank 61 during work, pump the liquid into the inner oil pipe until the pipe is full, and open the pipe cycle. The heating jacket is heated to the formation 55℃, constant temperature, pressure 3MPa, flow rate 0.1m / s, real-time monitoring of dynamic corrosion rate through electrochemical corrosion probe module 4, take out corrosion coupons every 3 days, weigh the difference in this time period For the uniform corrosion rate of the corrosion inhibitor, MH46 and YJH-10 corrosion inhibitors are used in this embodiment, wherein the slow-release rate of the corrosion inhibitor MH46 is 0.03 mm / a, and the slow-release rate of the corrosion inhibitor YJH-10 is 0.15 mm / a. MH46 was selected as the corrosion inhibitor suitable for oilfield water samples.

Embodiment 2

[0046] Dynamic corrosion inhibitor screening and evaluation test: store the field water sample in the liquid storage tank 61 during work, pump the liquid into the inner oil pipe until the pipe is full, and open the pipe cycle. The heating jacket is heated to 63°C, constant temperature, pressure 5MPa, and flow rate 0.2m / s. The dynamic corrosion rate is monitored in real time through the electrochemical corrosion probe module 4. In this example, KEW-227 and RX-201 corrosion inhibitors are used. The slow-release rate of corrosion inhibitor KEW-227 is 0.02mm / a, and the slow-release rate of corrosion inhibitor RX-201 is 0.11mm / a. KEW-227 was selected as the corrosion inhibitor suitable for oilfield water samples.

Embodiment 3

[0048] Dynamic scale inhibitor screening and evaluation test: store the field water sample in the liquid storage tank 61 during work, pump the liquid into the inner oil pipe until the pipe is full, and open the pipe cycle. The heating jacket is heated to the formation 46℃, constant temperature, pressure 5MPa, flow rate 0.1m / s, real-time monitoring of the dynamic scaling rate through the scaling evaluation module 3, taking out the scaling coupon every 2 days, weighing the difference in this time period The uniform scale inhibition rate of the scale inhibitor. In this example, ZG-108 and ZG-558 scale inhibitors are used. Among them, the scale inhibition rate of the scale inhibitor ZG-108 is 75.6%, and the scale inhibition rate of the scale inhibitor ZG-558 is 87.6%. . ZG-558 was selected as the scale inhibitor suitable for oilfield water samples.

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Abstract

The invention discloses an oil-gas well shaft corrosion simulation evaluation system. The oil-gas well shaft corrosion simulation evaluation system comprises an oil casing pipe evaluation module, a corrosion coupon module, a scaling evaluation module, an electrochemical corrosion probe module and a double-layer circulation pipeline, wherein the oil casing pipe evaluation module, the corrosion coupon module, the scaling evaluation module and the electrochemical corrosion probe module are all connected with the double-layer circulation pipeline; the oil casing pipe evaluation module is used forfluid scouring simulation of an oil casing pipe and an inner coating of the oil casing pipe; the corrosion coupon module is used for dynamic scouring corrosion simulation of fluid; the scaling evaluation module is used for scaling simulation of the oil casing pipe; and the electrochemical corrosion probe module is used for electrochemical corrosion simulation of the oil casing pipe. The oil-gas well shaft corrosion simulation evaluation system can simulate the corrosion scaling factors such as the fluid flow speed, pressure and temperature in the shaft environment, can be used for conducting oil casing pipe corrosion rate testing, corrosion behavior and corrosion mechanism research, anti-corrosion measure effect evaluation, corrosion inhibitor optimization, scale inhibitor optimization, non-compatible fluid scaling condition research and the like, and provides an effective evaluation means for anti-corrosion and anti-scaling work of an oil-gas well.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field corrosion and protection, and relates to an oil and gas well borehole corrosion simulation evaluation system. Background technique [0002] In the process of oil exploitation, the tubing and casing as a bridge connecting drilling and oil production is very important. It is used in large quantities and has high requirements for safety and stability. It must be used for a long time in one trip and is a key part of the long-term stable and high production of the oil field. However, with the extension of oilfield development time and more and more enhanced oil recovery measures continue to be used in production, such as high-pressure water injection, fracturing, large-scale acidification, steam injection, etc., the working environment of tubing and casing continues to deteriorate. The basic theories and methods of tubing and casing strength design all take completion construction as the main cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/00
Inventor 郭钢李琼玮何淼孙雨来周佩付彩利姜毅杨会丽程碧海刘宁
Owner PETROCHINA CO LTD
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