关键词: 小井眼, 聚璜钻井液, 卡钻, 润滑性

Abstract: This paper introduces the development of slim hole drilling fluid of CNPC Xibu Drilling Engineering Company Limited. The company puts forwardsuch development ideas as the reduction of annular pressure loss, the enhancement of suspension and carrying capability, the enhancement of wall buildingto prevent plugging and collapse, the protection of oil and gas zones, and the enhancement of lubricating and anti-jamming capability, and develops low solidand slim hole polymer sulfonate drilling fluid, based on analyzing the difficulties in drilling operation. The new drilling fluid has been applied to 56 wellsin Yumen Oilfield, Turpan-Hami Oilfield, and the oilfields of Uzbekistan and Kazakhstan, which shows high shear-thinning ability and lubricating ability,strong suspension and carrying capability, good purification effect, favorable anti-plugging and wall building performance, and very good effect in reservoirprotection.

Key words: slim hole, polymer sulfonate drilling fluid, rock-drilling jamming, lubricating ability