A method for forming nitrogen foam surface for oil and gas well fracturing

Abstract

The invention relates to a method for forming nitrogen foam ground for oil and gas well fracturing. The method includes the following steps: (1) placing and connecting construction vehicles and fracturing equipment: sequentially connecting the fracturing liquid base liquid tank truck, liquid supply pump truck, Sand mixing vehicle, fracturing pump vehicle, foam generating device and wellhead, the liquid nitrogen vehicle is connected to the foam generating device; (2) pressure test; (3) forming foam fracturing prefluid; (4) forming foam carrying sand Fracturing fluid; (5) Under the wellhead pressure, the displacements of the foam fracturing pre-fluid and the foam-carrying sand-carrying fracturing fluid are both: 1-10m3 / min, and the foam fracturing pre-fluid or foam-carrying sand-carrying pressure The quality of the foam in the cracking fluid is 50%-80%. The foam fracturing fluid pre-fluid and foam fracturing fluid sand-carrying fluid formed by the invention can effectively reduce the fluid loss of the fracturing fluid in the formation, improve the fracturing efficiency, reduce formation damage, and help improve the fracturing performance of oil and gas wells. Effect.

Description

technical field [0001] The invention relates to a nitrogen foam surface forming method for oil and gas well fracturing, and belongs to the technical field of oil and gas well exploitation. Background technique [0002] At present, the water-based fracturing technology commonly used in China, which uses natural vegetable gum, cellulose, synthetic polymer, etc. Decrease is not conducive to fracturing stimulation. Foam fracturing fluid has the advantages of strong sand-carrying capacity, low filtration loss, no residue damage, and high flowback volume, and is suitable for fracturing stimulation of low-permeability oil and gas reservoirs. [0003] The surface formation process of foam fracturing fluid determines the quality of foam fracturing fluid and directly affects various performance parameters of fracturing fluid. At present, in China, in the ground formation process of foam fracturing fluid, nitrogen and sand-carrying fracturing fluid base fluid are usually mixed direct...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a nitrogen foam surface formation method for oil and gas well fracturing, which overcomes the deficiency that the existing foam fracturing fluid surface formation process cannot produce uniform and stable foam safely and efficiently

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