Fracture Heightgrowth controlling technique

When the oil and gas layer is very thin or middle layer and the shielding layer between the minimum horizontal main pressure difference is small, the crack pressure height to easily enter the shielding layer, when the need to control the natural gas fracturing heightextension. Can be realized by controlling the Proppant fluid performance parameters and construction displacement, the more reliable is the artificial interlayer fracture Heightgrowth controlling technique.

The basic principle is in the pre adding liquid floating or sinking type guide agent,through the front fluid into the crack, floating guide agent and sink type guiding agentrespectively, floating and sinking gathered at the top and bottom of artificial fracture,low permeability formation compaction artificial barrier, prevent crack pressure upward/ downward propagation, reach the fracture height controlling purpose. In order to make the two guide agent can move up and down, usually in the injection with guiding agent liquid short-term after the pump stops, then the fracturing operation normal.

Artificial interlayer fracture height controlling technology is mainly used to 1) bulkhomogeneous formation production layer and non production layer interbed; 2)production layer and between layers of water gas, good interlayer; 3) production layer and the shielding layer stress difference can not effectively control the cracks ofvertical extension.