Offshore bottom water thin mutual reservoir fracturing parameter design method

By optimizing fracturing parameters through well logging data and core experiments, and combining numerical simulation to determine the optimal pumping procedure, the problem of fracturing design for thin interbedded reservoirs in bottom water at sea was solved, and effective transformation under offshore construction conditions was achieved.

CN121365623APending Publication Date: 2026-01-20CNOOC TIANJIN BRANCH
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202511475128.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-15
Publication Date
2026-01-20

AI Technical Summary

Technical Problem

The fracturing design of thin interbedded reservoirs in bottom water at sea faces dual constraints from geological conditions and offshore construction conditions. Existing technologies lack optimization basis, making it difficult to select fracturing parameters and balance avoiding bottom water with increasing the stimulation length.

Method used

By establishing geostress and rock mechanics profiles using well logging data, and combining this with core experiments to obtain fracture toughness, we can optimize fracturing flow rate, fluid viscosity, and fracture height. We can then use numerical simulation to determine the optimal parameters and pumping procedures to fully modify the water-bearing layer.

Benefits of technology

Quickly determine the optimal fracturing scheme to ensure that the water layer is avoided while the thin interbedded reservoir is fully modified under offshore construction conditions, thereby improving the modification effect.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121365623A_ABST
    Figure CN121365623A_ABST
Patent Text Reader

Abstract

The invention provides an offshore bottom water thin mutual reservoir fracturing parameter design method, and relates to the technical field of oil and gas exploitation, the method comprises the following steps: S1, determining vertical distribution of a reservoir section mud layer, a sandstone layer and a water layer according to logging data, and establishing a target well section crustal stress and rock mechanics profile; s2, acquiring the fracture toughness of rocks with different shale contents under different stresses to obtain a corrected fracture toughness profile; s3, according to the fracture half length, the fracturing displacement, the critical mudstone layer penetrating thickness corresponding to the fracturing fluid viscosity and the penetrating layer fracture height of the reservoir are initially calculated, and parameters needed for avoiding a water layer and fully transforming a thin interbed are obtained; s4, according to the fracture flow conductivity, the sand amount and the sand-carrying fluid amount are calculated initially; s5, the liquid efficiency is determined according to block fracturing historical data, the prepad fluid proportion range is initially calculated, and the prepad fluid amount is calculated; and S6, optimizing parameters through numerical simulation, and determining final fracturing parameters and a pump injection program. According to the method, the requirements of geological and offshore construction can be met, and the optimal fracturing scheme and the optimal pumping program can be rapidly determined.
Need to check novelty before this filing date? Find Prior Art