Abstract: The submersible pump system is a critical factor restricting the operational air gap of jack-up drilling platforms,and the operational air gap is one of the important parameters determining the operational capability of drilling platforms. With the ever-increasing demand for offshore oil and gas resources,the workload of adjustment well operations in the Bohai Sea area remains robust,leading to a high demand for drilling platforms with large air gaps. According to the traditional construction technology,the submersible pumps could be modified during the platform docking period to increase the operational air gap. However,this method incurs high docking costs and fails to meet the urgent demand of the drilling operation market. A creative modification and construction scheme is proposed for a certain drilling platform,which enables the completion of submersible pump modification during the periods of towing,positioning and ballasting without affecting normal operations,thereby enhancing the operational capability of the platform.

Key words: submersible pump, large air gap, production well, towing, construction process