Non-screen pipe compound fracturing fabric network framework gravel-filling sand prevention method

Abstract

The invention provides a compound fracturing fabric network framework gravel insertion sand prevention method which does not use a sieve tube. A prepad fluid which includes two parts is poured into a well, the first prepad fluid is a weak water solution prepared by a micro emulsion solution and formate which are disclosed in a patent document with the patent application number of 200610009675.8, the blending ratio is that each 10 tons of water is added with micro emulsion and formate, both of which take up 2 percent of water weight; the second prepad fluid is viscoelastic load fluid with the blending ratio of 40 tons of water added with guar gum which takes up 2 percent of the water weight and 20 tons of sand. The invention has the advantages that the construction is easy and convenient which is laborsaving and timesaving; at the same time, the invention is suitable for a thin oil well, a gas well, a viscous crude well and has wide adaptation range to well temperature, and can greatly improve production efficiency and the productive capacity of the oil well, guarantee the regular production of the oil and gas well and also the comprehensive economic benefit is prominent.

Description

1. Technical field

[0001] The invention relates to a method for preventing sand production in oil wells or oil gas wells, especially heavy oil wells, during oil field development. 2. Background technology

[0002] The currently widely used sand control technologies can be roughly divided into two categories: mechanical sand control technology and chemical sand control technology. These sand control technologies have many shortcomings in terms of practical effects. For example, mechanical sand control technology includes gravel packing sand control of wire screen, gravel packing sand control of slotted liner, sand control of sand filter pipe and so on. Their common feature is that after the wire-wound screen (or slotted liner, sand filter pipe, etc.) sand pipe, etc.) and the annular space between the casing and the part of the oil layer that is deficient around the wellbore. Their basic principle is that the filled sand layer blocks the flowback of the formation sand, and t...

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