This paper focuses on field experience in block 1 of Yemen Republic. The wells have to be drilled through hard limestone and severe fractured thief zone. Low rate of penetration (ROP) and total mud loss were encountered during drilling operations. On the basis of geological characteristics, drilling fluids and economy, the adaptability of gasified fluids drilling in block 1 was evaluated. At the beginning of field application, gasified fluids drilling was only used in the surface interval because some downhole problems, such as lost circulation in sand formation with aerated fluids and the casing stuck. According to these problems, the well structure, air and fluids injection parameters, formulas of foam and aerated base fluids were optimized, and aerated blind drilling was chosen as the principal means to penetrate the severe lost circulation formation, the perfect technical measures were also formulated. The experience of 3 field wells showed that with only air, only foam or only aerated fluid could deal with a part of drilling problems; the integrated application of gas drilling could satisfy the requirements of ROP improvement, borehole wall stability and leakage prevention.