Study on Feasibility of Surface Concentric Pipe Type Zonal Water Injection Technology in Middle East

Abstract

Oilfield in Middle East has entered the middle and late stage of development. It is urgent to carry out layered water injection to supplement formation energy and improve development effect. The development status of zonal water injection technology at home and abroad is analyzed. According to the characteristics of large water injection rate, high risk of corrosion and scaling, few zonal layers and unable to long-term field measurement and adjustment of zonal water injection in Middle East, surface concentric pipe type zonal water injection technology is proposed. The most outstanding feature of this technology is to move the complex downhole measurement and adjustment device to the ground. It realizes the real-time measurement and adjustment of water injection through the remote monitoring system, without going down the well with steel wire or cable. Taking two layers water injection in 7” production casing in H oilfield of Middle East as an example, through nodal analysis and research, water injection string composition of 4” outer tubing and 2–3/8” inner tubing is designed. It is predicted that the single-layer daily water injection will reach 250 m3/d–850 m3/d, the single well daily water injection will reach 500 m3/d–1600 m3/d, and the allowable running depth of tubing is 3792 m. The study results show that surface concentric pipe type zonal water injection technology can meet the requirement of zonal water injection development of oilfield in Middle East.