东海西湖油气田水平井应用效果及评价

Application Effect and Evaluation of Horizontal Wells in Xihu Oil and Gas Field, East China Sea

李妍 徐晨

LI Yan XU Chen

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院，上海　200120

Institute of Exploration & Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

边底水油气藏和低渗油气藏在开发过程中存在生产压差大、单井产能低和动用程度低等问题。为解决此类油气藏开发问题，东海西湖油气田自2006年提出应用水平井进行油气藏的开发生产。现今已有多个油气田用实际生产证实了水平井的高效开发。强边底水气藏利用水平井生产时生产压差仅0.4 MPa，延长无水期2年并维持稳产；多分支水平井开采低渗气藏后，无阻流量较直井高3～5倍，多口水平井生产6年的年平均递减率仅6.7%。东海西湖水平井的成功应用为海上油气田开发取得了较好的经济效益，也为后续油气藏开采的井型选择提供了指导依据。

In the development process of edge and bottom water reservoirs and low permeability reservoirs, there are some problems such as great production pressure drop, low single well productivity, and low utilization degree. In order to solve the difficulties of such reservoir development, horizontal wells have been applied to the oil and gas production in Xihu oil and gas field, East China Sea since 2006. At present, the efficient development of horizontal wells has been proven by actual production of multiple oil and gas fields. The production pressure difference of the strong edge and bottom water gas reservoirs is only 0.4 MPa when the horizontal well is used for production. The dry period is extended for 2 years and the production is maintained. After multi-branch horizontal wells are used in low permeability gas reservoirs, the open flow capacity is 3～5 times higher than that of vertical wells, and the average annual decline rate of multi-branch horizontal wells in 6 years is only 6.7%. The successful application of horizontal wells in Xihu oil and gas field, East China Sea has brought great economic benefits of offshore oil and gas field development, and also provided guidance for the selection of well types for subsequent oil and gas reservoir exploitation.

https://doi.org/10.3969/j.issn.1008-2336.2023.03.033