A heat-resistant jelly

Abstract

The invention provides a heat-resistant jelly, which is composed by mass percent as follows: 0.3% to 0.5% of acrylamide / acryloyloxyethyltrimethylammonium chloride copolymer, sodium tripolyphosphate or / and aminomethylene Sodium phosphonate 0.1%-0.5%, phenol 0.05%-0.15%, paraformaldehyde 0.05%-0.1%, thiourea 0.2%-0.4%, sodium malonate or / and D-isoascorbate sodium 0.05%-0.2% , the balance is water, and the sum of each component is 100%. Among them, the relative molecular mass of acrylamide / acryloyloxyethyltrimethylammonium chloride copolymer is 200×104~500×104, and the mass content of acryloyloxyethyltrimethylammonium chloride monomer is 10%. ~30%. The gelling time of the jelly provided by the present invention is adjustable within the range of 15-54 hours, and has excellent temperature resistance. It has no shrinkage after aging for 180 days at 160°C, and can be used as a plugging agent in the near-well zone and the deep part of the oil well. , and can also be used to block steam channeling in the process of thermal recovery of heavy oil.

Description

Technical field: [0001] The invention relates to a polymer plugging agent, in particular to an acrylamide / acryloyloxyethyltrimethylammonium chloride temperature-resistant jelly, which belongs to the technical field of oil field chemistry. Background technique: [0002] Water injection oil production is the main method for efficient development of new blocks and adjustment of old oilfields to tap potential. Due to the continuous breakthrough of injected water, edge water and bottom water, the water content of oil wells rises rapidly during the production process, and the oil production drops sharply. become the key to enhanced oil recovery. Polymer jelly has become the most widely used water blocking agent because of its low price, simple preparation and good construction effect. However, for some high-temperature deep well reservoirs in my country, the reservoir temperature is as high as 150°C, because ordinary polyacrylamide is prone to degradation under high temperature c...

AI Technical Summary

Problems solved by technology

Inorganic particle type plugging agent mainly refers to the plugging agent whose main component is cement, fly ash and other inorganic particles, which are injected into the formation in the form of suspension to play a plugging role. The advantage of good temperature, but the outstanding defect of granular plugging agent is that the plugging of the formation is rigid, the plugging effect is not selective, and it is easy to cause damage to the entire reservoir; moreover, the construction is relatively difficult. Poor operability limits its application and is only suitable for plugging reservoir formations with high permeability and large pores

For the lignin / tannin-based jelly blocking agent, since the tannin and lignin molecules are rigid molecules, the jelly formed by it has strong temperature resistance, but the crosslinking agent in the lignin / tannin-based jelly system And the use concentration of lignin / tannin extract is higher (lignin / tannin extract>6%, cross-linking agent>1%), which makes the cost higher and reduces the economic benefits of the oil field

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