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摘要? 國內(nèi)外常用的CO2 腐蝕速率預(yù)測模型主要有 3 類,，分別為經(jīng)驗型預(yù)測模型,、半經(jīng)驗型預(yù)測模型和機理型預(yù)測模型,。經(jīng)驗型預(yù)測模型以Norsok M-506 模型為代表,，此類模型對腐蝕機理考慮較少,，主要根據(jù)實驗數(shù)據(jù)和現(xiàn)場數(shù)據(jù)擬合建立,。著名的半經(jīng)驗型預(yù)測模型有DW系列模型，半經(jīng)驗?zāi)Ｐ褪窃诳紤]過程動力學及介質(zhì)傳輸過程的基礎(chǔ)上,，對實驗數(shù)據(jù)和現(xiàn)場數(shù)據(jù)進行擬合而建立的預(yù)測模型,。經(jīng)典的機理型預(yù)測模型有Nesic模型，機理模型采用動力學公式求解腐蝕速率,，物理意義明確,，與現(xiàn)場數(shù)據(jù)結(jié)合少。針對當前渤海油田沒有適用的CO2 腐蝕速率預(yù)測模型問題,，本文總結(jié)了現(xiàn)有CO2 腐蝕速率預(yù)測模型,，對比分析各個模型腐蝕機理、腐蝕形態(tài)和影響因素,。以半經(jīng)驗型研究模型為基礎(chǔ),，結(jié)合渤海油田實際生產(chǎn)條件下的CO2 腐蝕實驗,，在充分考慮溫度、CO2 分壓,、流速,、腐蝕產(chǎn)物膜的基礎(chǔ)上，引入CO2 腐蝕速率修正因子,，建立適用于渤海區(qū)域的CO2 腐蝕速率預(yù)測模型,。將本文建立模型與DWM、ECE,、BP等半經(jīng)驗?zāi)Ｐ瓦M行對比分析,，結(jié)果發(fā)現(xiàn)，本文所建模型相對誤差最小,，更接近渤海區(qū)域?qū)嶋HCO2 腐蝕速率,，驗證了本文所建模型可靠性。腐蝕實驗結(jié)果和模型預(yù)測結(jié)果均表明,，N80 管材的抗CO2 腐蝕能力最差,，13Cr管材的抗腐蝕能力最強。通過建立井筒腐蝕速率分布預(yù)測圖版,，對比不同管材 CO2 腐蝕速率,，為渤海區(qū)域油氣井油套管管材優(yōu)選提供理論依據(jù)。

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關(guān)鍵詞 ：渤海油田；CO2 腐蝕,；腐蝕速率預(yù)測模型,；可行性分析；管材優(yōu)選

Abstract：

The prediction models of CO 2 corrosion rate are summarized, and the corrosion mechanism, corrosion morphology, and influence factors of each model are compared and analyzed in combination with CO 2 corrosion experiments under actual production conditions in the Bohai oil field. There are three types of CO 2 corrosion prediction models around the world. They are the empirical prediction model, semi-empirical prediction model and the mechanism prediction model. The empirical model is built considering less corrosion mechanism but more experimental data and field data. And the Norsok M-506 model is one of the most famous empirical models. The semi-empirical model is established by fitting experimental data and field data based on the dynamics process and the medium transmission process. The DWM, DW91, DW93, and DW95 are well-known semi-empirical prediction models for calculating the CO 2 corrosion rate. The mechanism model uses dynamic formula to calculate the CO 2 corrosion rate, which has a clear physical meaning and is less integrated with experimental data and field data. The Nesic model is most classic mechanism model to predict the CO 2 corrosion rate. Based on a semi-empirical and semi-mechanical model, the CO 2 corrosion rate prediction model is built in this paper fully considering the effects of temperature, CO 2 partial pressure, flow rate, CO 2 corrosion product film, and the CO 2 corrosion rate correction factor. Besides, a CO 2 corrosion experiment under actual production conditions in Bohai oilfield is conducted in order to let the CO 2 corrosion rate prediction model more suitable for the Bohai oilfield. The comparative study of the model established in this paper with DWM, ECE, and BP semi-empirical models re vealed that this paper’s developed model has the smallest average relative error and is similar to the actual rate of CO 2 corrosion in the Bohai oilfield, confirming that the CO 2 corrosion rate prediction model built in this paper has great prediction effects and is more accuracy. Both the results of the corrosion experiment and model predictions in this paper have revealed that N80 pipe has the worst resistance to CO 2 corrosion and the 13Cr pipe has the best resistance to CO 2 corrosion. The ranking of four kinds of pipes for CO 2 corrosion resistance is N80 < 1Cr < 3Cr < 13Cr. The wellbore corrosion rate distribution forecast contrasts the CO 2 corrosion rate of various pipe materials, which provides a theoretical framework for the optimization of oil production and casing

pipes in the Bohai oilfield.

Key words： Bohai oilfield; CO2 corrosion; CO2 corrosion rate prediction; feasibility analysis; pipe optimization

收稿日期: 2020-12-30 ????

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基金資助:國家自然科學基金資助項目(51574256) 資助

通訊作者: [email protected]

引用本文: ??

PENG Long, HAN Guoqing, YANG Jie, LANDJOBO PAGOU ARNOLD. CO2 corrosion rate prediction model of production systems in the Bohai Oilfield. Petroleum Science Bulletin, 2020, 04: 531-540

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