Sand-fixing and plugging-removing treatment fluid for oil well sand control in fine silt sand reservoirs, sand control treatment fluid system and sand control method using the same

Abstract

The invention relates to a sand consolidation and plugging removing treatment fluid for sand control of fine silt oil reservoir oil wells, a sand control treatment fluid system and a sand control method using the same, and belongs to the technical field of petroleum exploitation. The sand consolidation and plugging removing treatment fluid comprises the following components by mass: 8-12% of a sand consolidation and plugging removing agent, 0.5-1.5% of a drainage aid, 0.5-1.5% of a corrosion inhibitor, 1-2% of an iron ion stabilizer, 1-2% of mutual solvent, ammonium chloride and the balance ofwater. The sand control treatment fluid system is composed of a pretreatment liquid, a preflush, a treatment liquid and a replacement liquid, and the volume ratio is 4-6:1-2:2-3:1-2 in turn. The invention also disclose a sand control method using that sand control treatment fluid system. The synergistic effect of each component of the sand control treatment fluid system forms a bonding coating onthe surface of fine siltstone and clay grains, and sand is cemented and consolidated. After the implementation of this measure, the sand control and production increase effect is remarkable.

Description

technical field [0001] The invention relates to a sand-fixing and plugging-removing treatment liquid for fine silt sand reservoir oil well sand control, a sand control treatment liquid system and a sand control method using the same, belonging to the technical field of petroleum exploitation. Background technique [0002] In the process of oilfield development, some fine silt sand reservoirs with low cementation strength are often accompanied by sand production during the production process. For conventional sand production wells, conventional mechanical sand control methods can solve the problem, but some oil production wells are affected by sand production. It is fine silt, mud or clay, causing frequent pump jams and well workover. For this type of sand production, conventional mechanical sand control is more difficult. Even if the sand control is successful, the production of oil wells will decrease, and the ideal sand control purpose cannot be achieved. [0003] Chinese...

AI Technical Summary

Problems solved by technology

[0006] (1) Mechanical sand control methods cannot control fine silt, mud and clay substances with small particle sizes;

[0007] (2) Sand control screens are easily blocked by fine silt and mud, resulting in reduced production or output of oil wells;

[0008] (3) The sand control pipe string lowered into the well is easy to be buried by sand, and it is easy to cause overhaul accidents during salvage;

[0009] (4) The fracturing sand control or filling sand control process is complicated and the operation cost is high;

[0011] (6) The freezing point of crude oil in some shallow unconsolidated reservoirs is relatively high, and external treatment fluids are likely to cause cold damage to the formation