Research and application of combined drilling technology in Hashan area of Shengli West Exploration Area

Abstract

This paper aims to solve the technical problems such as poor drillability， large formation inclination， difficult well deflection control， and easy wall instability in the middle and deep Carboniferous and Permian hard formation in the Hashan area of Shengli western exploration area and realize the efficient exploration and benefit development of oil and gas reserves. Based on the current conventional drilling technology， the applicability and process optimization of segmented combined drilling technology were studied， and supporting technologies for speed acceleration and safety construction related to gas drilling were proposed for the Carboniferous and Permian hard formation of dolomitic rock and igneous rock， forming the regional construction standards. After the transformation from gas drilling to drilling fluid construction， the combined drilling technology of “gas drilling + ‘impregnated bit + turbine/high-speed screw’” was preferred. According to the formation characteristics， efficient impregnated bit series of different sizes were developed to achieve well deflection control and improve the rate of penetration. The combined drilling technology was successfully applied in Hashan3 and Hashan2 wells and achieved good results. During gas drilling， the rate of penetration in Well Hashan3 reached 5.2 m/h， more than three times faster than the conventional drilling method. During drilling fluid construction， the technology of “impregnated bit + turbine/high-speed screw” was adopted， and the formation inclination was 30°. The well deflection was well controlled， and the rate of penetration was close to 1 m/h， which showed a good regional application effect compared with conventional drilling technology. The field application shows that the combined drilling technology of “gas drilling + ‘impregnated bit + turbine/high-speed screw’” is an effective means to increase the speed and efficiency of middle and deep drilling in the Hashan area of Shengli west exploration area. However， the technology also has bottlenecks. Combined with the applicability research of particle impact drilling （PID） technology， it is suggested that the PID technology should be introduced and improved in the next step， so as to achieve speed and efficiency breakthrough in regional drilling.

Keywords

• gas drilling
• turbine drilling tools
• impregnated bit
• speed and efficiency improvement
• hashan area