随着川西低渗透致密气藏不断加大水平井开发力度,水平井气井逐渐增多,水平井井筒积液成为气藏水平井开发普遍存在的难题。如果井筒内产生积液,井底回压增大,井口压力下降,产量递减较快,气井携液能力减弱,将导致井筒附近储层的含水饱和度升高,气相渗透率下降,气井难以开采,甚至最终水淹停产。应用水平井筒内流体由分层流向非分层流转变判别式,对影响水平段井筒携液的因素进行分析表明:水平段井筒倾角越大、积液高度越高,水平井筒中气液两相流型更易从层流转向非层流,水平段中的液体也就更易被气流带出。虽然井筒倾角对气体临界流速的影响较小,但井筒倾角越大,井筒内A靶点附近的积液高度越高,液体就更易被气流携带出水平段。通过实例分析也证明,水平井A、B靶点高差对气井排液有影响,B靶点比A靶点越高,越有利于井底积液从水平段排出。 With the development of horizontal wells in the low permeability and tight gas reservoirs in western Sichuan, the horizontal gas wells gradually increase, and the horizontal wellbore fluid has become a common problem in the development of horizontal wells in gas reservoirs. If the wellbore produces effusion, the bottomhole back pressure increases, the wellhead pressure drops, the production decreases rapidly, and the weakened liquid carrying capacity in the gas well will cause the water saturation of the reservoir near the wellbore to increase, the permeability of the gas phase will decline, and the gas well will be difficult to mine , And eventually flooded stop production. The horizontal wellbore fluid transition from stratified flow to non-stratified flow transition discriminant is applied to analyze the factors that affect the horizontal wellbore carrying fluid. It shows that the higher the horizontal wellbore inclination angle is, the higher the liquid height is. The horizontal wellbore gas-liquid two-phase The flow pattern is more easily diverted from laminar to non-laminar, and the liquid in the horizontal section is more easily entrained by the airflow. Although the influence of wellbore inclination on the gas critical velocity is small, the greater the wellbore inclination is, the higher the liquid height near the A target in the wellbore is, and the liquid is more easily carried by the air stream out of the horizontal section. The case analysis also proves that the horizontal well A, B target height difference affects the gas well drainage, B target A target is higher, the more conducive to bottom hole fluid discharge from the horizontal section.