Well Completion with AICDs (Autonomous Inflow Control Devices)
A technology based on Bernoulli's principle: “The sum of static pressure, dynamic pressure and friction losses along the flow direction remains constant.”
Advantages
- Selective inflow control. AICDs allow production from different sections of the wellbore to be managed independently. They restrict the influx of unwanted fluids (gas or water) while stimulating oil inflow from less permeable or poorly drained zones. As a result, the inflow profile along a horizontal or multilateral wellbore is evened out.
- Mitigating breakthroughs and coning. The devices help delay or soften gas breakthrough from the gas cap or water from bottom water, preventing the formation of “cones” — local zones of sharp fluid-contact change that drastically reduce production efficiency.
- Higher oil recovery factor (ORF). By bringing previously poorly drained reservoir intervals into production, the technology increases the total volume of recoverable reserves.
- Economic effect. Stable operation of a well fitted with AICDs sustains a high oil rate for longer and curbs the growth of the gas-oil ratio or water cut. This directly improves economic efficiency over the entire well life cycle.
- Well “revival” capability. If an already producing well has declined due to uneven inflow or early breakthroughs, secondary completion with AICDs can restore its productivity without the need to drill a new well.
- Autonomy. The devices operate on their own, without continuous surface control, adapting to changes in fluid flow in real time.
Specifications
- filtration fineness: 05 to 1.0 mm
- number of AICDs per filter: 1 to 4
- filter element length: 3000 to 8000 mm
- filter element type: mesh or wire-wrapped
- size range (liner): 102 to 146 mm
Application area and experience
- Development of thin oil rims in sub-gas zones. This is one of the most typical applications: when there is a developed gas cap but a relatively thin oil layer, AICDs help operate the well steadily, preventing rapid gas breakthrough.
- Horizontal and multilateral wells. In such wells different sections of the borehole may have significantly different permeability or fluid saturation. AICDs make it possible to segment the wellbore (using packers) and individually tune inflow in each segment.
- Mature fields. The technology is relevant for extending the life cycle of already producing wells, where water and gas problems grow over time.
- Complex geological and field conditions. For example, when oil, water and gas intervals alternate within the reservoir, or when fractures and zones of increased fracturing are present.