The Research And Application Of Horizontal Wells Drilling Matching Technology In Du 84 Block

Horizontal drilling technology is directional wells drilling techniques which use special downhole drilling power tools and measuring instruments, drilled inclination greater than 86°and maintain this angle drill hole section for a certain length. During the oil and gas field development, horizontal wells can increase the length of the target zone,the drainage area and oil and gas production for times. Horizontal drilling technology includes measure while drilling,well trajectory control technology, wellbore stability technology and drilling and completion fluid technology. The radius of curvature from the vertical well section into the horizontal section smaller,the difficulty of construction greater.Through the analysis of Du 84 block geological conditions in the Liaohe Oilfield, the study of reservoir array design, the improvement study of horizontal wells and sidetracking horizontal well drilling technology and instruments are carried out. The technique study for sand prevention with heavy oil thermal recovery, the study of drilling and completion fluid technique and the study of short radius side tracking horizontal well technique are also carried out. Horizontal wells and sidetracking horizontal well 19 wells were deployed in Du84 block. Geological trajectory tracking of horizontal wells and sidetracking horizontal well was completed 9 wells. The deflecting force of the improved screw drilling tool can be increased by 10% to 20%. To meet the needs of trajectory control, controlling accuracy of wellbore trajectory can be up to ±1m. Under the premise of ensure the construction safety and do not pollute the reservoir, a system of mud is used to complete the kick-off section and horizontal section of the construction. According to different blocks, different sand control screen was adopted in order to achieve significant results. Sidetracking short radius horizontal well theory research and the compilation of computer software is completed. Related supporting tools and equipment are improved. A total of 9 mouth of horizontal Wells and sidetracking horizontal well are completed, the reservoir drilling rate is over 87%. A complete set of horizontal well techniques can expand domestic and foreign markets as well as provide strong technical support for economic growth.