Successful Massive Hydraulic Fracturing of Deviated Wells in Fushan Complex Fault-Block Reservoir, Hainan Island

Abstract

Abstract Fushan complex fault-block condensate gas reservoir consists of more than 170 low-permeability fault blocks with multilayers of depth from 3300.0m to 4000.0m and temperature from 140.0°C to 174.0°C. Almost half of the new wells cannot achieve the economic production by unsuccessful fracturing and low proppant volume due to high temperature, deviated well with high angle-multilayers in long interval and close to the faults, etc. Based on reservoir and well features analysis, we put forward massive hydraulic fracturing (MHF) for wells with long interval multilayers, which cannot be Layered fracturing. Meanwhile, multistage sand slug and a large volume of proppant in pad stage are executed to decrease the risk of screen out and increase opportunities to break multilayers. Moreover, the low damage fracturing fluid was developed to improve the proppant carrying capacity in high temperature and reduce formation damage. Six deviated wells have been fractured in recent five years with quite good production and long yield period. In one well, over 84.0m3 proppant was pumped in and more than three years of stable production was achieved, which shows the success of MHF in complex fault-block reservoir. The introduction about MHF in this paper provides some guidelines for fracturing design in complex fault-block reservoirs, and offers an important reference to develop similar fault-block reservoirs as well.