Study on Characteristics of Nozzle Jet Pump for Water Injection in Offshore Oilfield

Abstract

A single high-pressure water source by the throttling way to inject water into different pressure wells is often used in offshore water injection platform. It will cause huge energy consumption. Therefore, a new idea of using adjustable jet pump instead of pipeline valve was proposed. A water injection well in Bohai was regarded as the research object, and an adjustable jet pump was designed. The 3D model was established and the Realizable k-ε turbulence model was used in Fluent to analyze how the nozzle-to-throat clearance and throat length affect the working performance of the jet pump. The reasonable structural parameters of nozzle-to-throat clearance and throat length were determined as 19.75 and 98 mm, respectively. To simulate the water injection process, the experiments of characteristic of the water injection pressure and flow rate when the nozzle opening varies as 50, 60, 70, 75, and 90% were carried out. Results show that when the water injection pressure ranges from 1.4 to 4.0 MPa, the water flow change from 605 to 273 m³/d with the 50% nozzle opening and the water flow changes from 803 to 657 m³/d with the 90% nozzle opening. By adjusting the nozzle opening, the adjustable jet pump can basically achieve the multiple combinations of injection pressure and flow. Compared with the existing water injection method, the new method can reduce energy consumption about 715 thousand kW-h per year.

Copyright 2017, Shaanxi Petroleum Society.

This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.

This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.