Oil deposit purification sewage sand-carrying filling sand prevention method and sand prevention pipe column

Abstract

The invention relates to an oil deposit purification sewage sand-carrying filling sand prevention method and a sand prevention pipe column. The method comprises the following steps of 1, putting the sand prevention pipe column provided with a top packer in a predetermined position in a well, conducting packing, and opening a filling sand adding channel; 2, with oil deposit purification sewage withthe viscosity of 1.4-1.6 mPa.s as sand-carrying liquid, mixing the oil deposit purification sewage with quartz sand with the particle size of 0.4-0.8 mm according to the sand-carrying ratio of 3-15%,and afterwards, conducting positive squeezing and filling; 3, conducting releasing, and backwashing remaining sand in a pipe. According to the method, the oil deposit purification sewage with low viscosity serves as the sand-carrying liquid, the risks of sand blocking and sand burying are reduced, successful sand adding is ensured, and the construction requirement for low-sand-ration filling sandprevention is met. The sand-carrying liquid is the purified thickened oil sewage of an area where a construction well is located, has good compatibility with stratum liquid and stratum minerals, avoids the situation that chemical reactions are caused and sediments clog stratum pores, and is wide in source, cheap and low in cost.

Description

technical field [0001] The invention belongs to the technical field of sand control of oil production machinery in oil fields, and in particular relates to a sand control method and a sand control pipe string for oil reservoir purification sewage to carry sand and fill. Background technique [0002] Due to shallow burial depth, poor diagenesis, loose cementation, low cementation strength, high viscosity of heavy oil, strong sand-carrying ability, production pressure difference during steam huff and puff production and oil recovery Excessive size and other reasons lead to serious sand production in oil wells. The sand production of oil wells has a serious impact on the production rate of heavy oil, making the oil well unable to produce normally, directly affecting the productivity of the oil well and the output of the oil field, increasing the workload of ground maintenance and downhole operations, and increasing the production cost. [0003] The content of fine silt in the ...

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Problems solved by technology

[0004] 1. Hanging filter sand control: Due to the small gap (0.07mm) of the metal felt in the sand filter tube, heavy oil and muddy components are easy to block the filter sand tube after sand control, resulting in a decrease in the seepage capacity of the filter sand tube and a large drop in oil well production

[0005] 2. Conventional extrusion filling sand control: multiple fracturing trucks (including fracturing trucks, sand mixing trucks, instrument trucks, etc.) and special sand-carrying fluid are required, and the cost of the two items is about 200,000 yuan; and special sand-carrying equipment is also required Medium and high viscosity sand-carrying fluid (viscosity 40-60mPa·s, 60-80mPa·s) prepared by liquid tank and various chemical materials, plus sand control and operation costs, the average sand control cost of a single well is 446,000 yuan, and the cost of measures is high. Poor economic benefits

[0006] 3. Chemical sand control: chemical agent formula is used, affected by the extrusion conditions and construction parameters during extrusion, the muddy fine silt sand cannot be properly discharged after sand control, which affects the permeability of the reservoir. After sand control, it is easy to cause production decline, and the validity period is relatively mechanical Filling and sand control has a short validity period

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