Well cementation method for treating shallow surface layer leakage of oil and gas well

The invention relates to the technical field of oil exploration, in particular to a well cementation method for treating shallow surface layer leakage of an oil and gas well. The method comprises the steps that (1) plugging drilling fluid is conveyed to a leakage layer to displace drilling fluid in an original well, then foam cement slurry is conveyed to the leakage layer to displace the plugging drilling fluid to flow into the leakage layer, and plugging is conducted; shallow surface layer leakage plugging treatment and well wall strengthening can be achieved, and the drilling fluid leakage problem and the well wall collapse problem are solved. According to the method for treating shallow surface layer leakage and borehole wall collapse, the later drilling fluid leakage and drilling tool jamming risks are reduced, and the drilling efficiency is improved. 本发明涉及石油勘探技术领域，具体涉及一种治理油气井浅表层漏失的固井方法。该方法包括：(1)将堵漏钻井液输送至漏失层驱替原井内钻井液，再将泡沫水泥浆输送至漏失层驱替所述堵漏钻井液向入漏失层内流动，进行堵漏。能够实现浅表层漏失堵漏治理和井壁强化，钻井液漏失问题和井壁垮塌问题得到解决。本发明提供了浅表层漏失和井壁垮塌