Geological design optimization of horizontal well

With the development of horizontal well drilling techniques, horizontal wells are widely used in the development of oil and gas field and have been paid more attention by the world oil industry. The number of horizontal wells is increased every year. However, some wells are not producing as well as people expected, such as productivity is low, water is breakthrough in a short period of time, and water cut increases quickly, oil production is dropped rapidly, so the production effect of the horizontal wells are reduced. This paper has analyzed the advantage and shortage of horizontal wells in the development of oil and gas field, and pointed out that the optimization of horizontal well geological design is the key point and basis for successfully developing oil and gas field and preventing early water breakthrough, and systematically summarized five aspects of optimization geological design which include:①horizontal section length optimization; ②orientation optimization of the horizontal section; ③location optimization of the A and B points; ④vertical location optimization of the horizontal section; and ⑤dynamic analysis of the static data. Besides, following up and adjustment of the horizontal well drilling at the well site are key points to ensure the success of the horizontal well. This paper has offered a reference for increasing the success ratio and development effect of horizontal wells.