A New Design of Internal Well Slot in Offshore Oilfields

An oilfield in the Bohai Sea has abundant reserves and large oil-bearing area, but it also has some problems, such as low degree of control of the well pattern, large well-controlled reserves, and imperfect injection and production, resulting in low recovery in this part of the block. In view of full consideration of the use of existing facilities, and rapid and efficient commissioning of production and the improvement of the versatility of drilling platform resources, the principle of reducing costs and increasing efficiency, breaking the routine was put forward, and a new idea of ​​​​drilling and completion leading the engineering construction professional to carry out the design of the well slot in the WHPE platform was launched. Based on the structure and facilities of the production platform, the platform is adaptively modified, with single-tube double wells or single-tube single-well slots built to achieve reservoir requirements. Meanwhile, according to the existing drilling platform's lift air gap, cantilever length, and obstacle avoidance ability, the notch shape and distribution design are clear. Finally, it is realized that operating as many wells as possible with conventional low-cost drilling platforms, and reduce overall project investment and increase oilfield development revenue. This method has been proved to be flexible, economical and reliable in practice, and it can establish a database for offshore platforms in future to realize rapid matching analysis and equipment transformation.