【摘要】：鹽腔注采周期的變化導(dǎo)致腔內(nèi)溫度周期性變化,進(jìn)一步導(dǎo)致圍巖熱應(yīng)力的周期性變化。由于鹽巖抗拉強(qiáng)度低,當(dāng)這種周期性熱應(yīng)力為拉應(yīng)力且數(shù)值較大時(shí),鹽巖將破碎從而導(dǎo)致腔體垮塌。結(jié)合聲吶帶壓測(cè)腔實(shí)測(cè)的鹽穴腔體形狀和體積數(shù)據(jù),采用有限元數(shù)值模擬方法,將溫度場(chǎng)與已建力學(xué)模型進(jìn)行耦合建立熱應(yīng)力模型,并對(duì)常規(guī)模型和熱應(yīng)力模型進(jìn)行對(duì)比,以分析熱應(yīng)力對(duì)腔體穩(wěn)定性的影響。結(jié)果表明:在常規(guī)模型中表現(xiàn)穩(wěn)定的部分區(qū)域,在熱應(yīng)力模型中卻發(fā)生垮塌現(xiàn)象,熱應(yīng)力模型計(jì)算結(jié)果與聲吶實(shí)測(cè)帶壓測(cè)腔結(jié)果吻合,由此推斷溫度變化所產(chǎn)生的熱應(yīng)力是影響腔體穩(wěn)定性的重要因素,嚴(yán)重時(shí)可能導(dǎo)致腔體垮塌。因此,腔體熱應(yīng)力影響因素的提出,進(jìn)一步完善了腔體穩(wěn)定性評(píng)價(jià)體系,使評(píng)價(jià)結(jié)果更加接近于地層的真實(shí)情況。
[Abstract]:The variation of injection and production period in salt cavity leads to the periodic change of temperature in the cavity and the periodic change of thermal stress of surrounding rock. As the tensile strength of salt rock is low, when the periodic thermal stress is tensile stress and the value is large, the salt rock will break and lead to cavern collapse. Based on the shape and volume data of the cavity measured by sonar band pressure measurement, the thermal stress model is established by coupling the temperature field with the established mechanical model by using the finite element numerical simulation method, and the conventional model and the thermal stress model are compared. The influence of thermal stress on the stability of cavity is analyzed. The results show that in the part of the conventional model, the collapse occurs in the thermal stress model, and the calculated results of the thermal stress model are in agreement with the results of sonar measured cavity with band pressure. It is inferred that the thermal stress caused by the temperature change is an important factor affecting the stability of the cavity, which may lead to the collapse of the cavity if it is serious. Therefore, the influence factors of cavity thermal stress further improve the evaluation system of cavity stability, so that the evaluation results are closer to the real situation of formation.
【作者單位】： 中國(guó)石油西氣東輸管道公司儲(chǔ)氣庫(kù)項(xiàng)目部;
【基金】：中國(guó)石油集團(tuán)公司重大科技專項(xiàng)“地下儲(chǔ)氣庫(kù)關(guān)鍵技術(shù)研究與應(yīng)用”,2015E-40
【分類號(hào)】：TE972

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