【摘要】：隨著油氣田開采難度和井下情況復(fù)雜化程度的增加,常規(guī)水泥環(huán)易發(fā)生脆裂,進而影響水泥環(huán)的層間封隔作用,影響井筒完整性。硫鋁酸鈣水泥是一種性能優(yōu)良的固井水泥材料,為了了解硫鋁酸鈣水泥在固井工程中應(yīng)用的潛力,制作了玻璃纖維增強硫鋁酸鈣水泥石(CSA/GRC)樣品,利用X射線衍射法分析不同齡期硫鋁酸鈣水泥的晶體水化產(chǎn)物;通過三軸應(yīng)力-應(yīng)變實驗,測試CSA/GRC固井水泥石的力學(xué)性能;采用掃描電子顯微鏡觀察CSA/GRC固井水泥石斷裂面的微觀形貌,分析玻璃纖維在硫鋁酸鈣水泥石中的增韌機理。研究結(jié)果表明:CSA/GRC固井水泥石具有良好的韌性和力學(xué)形變能力,軸向抗壓強度和極限應(yīng)變值比常規(guī)玻璃纖維固井水泥石分別提高了約45%和300%;玻璃纖維與硫鋁酸鈣水泥體系之間有良好的復(fù)合能力,纖維抗腐蝕性能強;通過應(yīng)力分散作用和橋聯(lián)作用,玻璃纖維可約束裂縫的進一步擴展,從而提高固井水泥石的韌性。
[Abstract]:With the increase of the difficulty of oil and gas field production and the complication of the downhole condition, the conventional cement ring is prone to brittle fracture, which affects the interlayer sealing of the cement ring and the wellbore integrity. Calcium sulphoaluminate cement is a kind of cementing cement with excellent properties. In order to understand the potential application of calcium sulphoaluminate cement in cementing engineering, glass fiber reinforced calcium sulphoaluminate cement (CSA-GRC) sample was made. The crystal hydration products of calcium sulphoaluminate cement at different ages were analyzed by X-ray diffraction, and the mechanical properties of CSA / GRC cemented cement were tested by triaxial stress-strain test. The fracture surface morphology of CSA-GRC cemented cement stone was observed by scanning electron microscope (SEM), and the toughening mechanism of glass fiber in CSA-GRC cemented cement was analyzed. The research results show that the cementing cement of CSA / GRC has good toughness and mechanical deformation ability. The axial compressive strength and ultimate strain value of glass fiber cementing cement are increased by about 45% and 300%, respectively, the composite ability of glass fiber and calcium sulphoaluminate cement system is good, and the corrosion resistance of fiber is strong. Through stress dispersion and bridging, glass fiber can restrain the further expansion of fracture, thus improving the toughness of cemented cement.
【作者單位】： 西安石油大學(xué)機械工程學(xué)院;西安石油大學(xué)石油工程學(xué)院;
【基金】：國家自然科學(xué)基金面上項目“頁巖氣水平井壓裂與生產(chǎn)套管變形機理及其控制機制研究”(編號:51674199)
【分類號】：TE256.6
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本文編號：2137461