Fracturing technology for horizontal wells in deep glutenite reservoirs

In response to the problem of high initial production but fast pressure drop and low cumulative production in the deep sand and gravel reservoir of Kangtan 1 block after vertical well pressure, a horizontal well volume fracturing technology exploration experiment was carried out to evaluate the production potential of single wells in the block and achieve effective utilization of reserves. Based on the understanding of sand and gravel rock core damage experiments and software simulation optimization results, a segmented clustering optimization mode with "dense cutting segmentation+single segment few clusters+high-strength sand addition to create long fractures" as the core has been formed. A low damage fracturing fluid system with a high temperature of 130 ℃ was developed through optimization experiments of fracturing fluid formula, targeting the high temperature and high pressure strong water sensitivity characteristics of reservoirs. High temperature and high solubility bridge plugs, high-strength composite particle size ceramic proppants, and 140 MPa construction grade completion casing and fracturing truck sets were selected. The fracturing technology has successfully completed field tests in 14 sections and 43 clusters in the experimental well, with a sand addition strength of 3.5 t/m and a construction flow rate of 14~16 m³/min. After fracturing, a two-stage oil nozzle of Ø3 mm+Ø4.5 mm is used for production, with a daily oil production of 70 t. It is expected that the cumulative oil production during the self injection stage can reach 15 000 t, and the final EUR of a single well can reach over 40 000 t. The horizontal well volume fracturing technology has effectively improved the stable production and pressure stabilization effect in the deep sandstone reservoir of Kangtan 1 block, providing technical support and replicable optimization templates for efficient exploration and beneficial development of the block.