Temperature-resistant jelly

A gel and temperature-resistant technology, which is applied in the field of acrylamide/acryloyloxyethyltrimethylammonium chloride temperature-resistant gel and polymer plugging agent, which can solve poor operability, construction difficulty, and no choice of plugging effect In order to achieve the effects of excellent temperature resistance, inhibition of syneresis, and excellent injection performance

A gel and temperature-resistant technology, which is applied in the field of acrylamide/acryloyloxyethyltrimethylammonium chloride temperature-resistant gel and polymer plugging agent, which can solve poor operability, construction difficulty, and no choice of plugging effect In order to achieve the effects of excellent temperature resistance, inhibition of syneresis, and excellent injection performance

CN104629697AInactive Publication Date: 2015-05-20CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Temperature-resistant jelly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 0.2g sodium tripolyphosphate, 0.05g paraformaldehyde, 0.05g phenol, 0.3g thiourea, 0.1g sodium malonate to 50g tap water, stir evenly to make it fully dissolved, then add 50g tap water to prepare the mass The acrylamide / acryloxyethyltrimethylammonium chloride with a concentration of 0.8% is mixed with the above solution and stirred evenly to obtain the gelling solution of the present invention. The gelling time of the gelling solution was 39 hours at 160° C., and the strength of the obtained jelly was 0.083 MPa. There was no dehydration phenomenon after aging at 160° C. for 180 days.

Embodiment 2

[0027] Add 0.2g sodium tripolyphosphate, 0.05g sodium aminomethylene phosphonate, 0.05g paraformaldehyde, 0.08g phenol, 0.3g thiourea, 0.1g sodium malonate to 50g of 2% NaCl aqueous solution, stir well , make it fully dissolved, then mix 50g of acrylamide / acryloyloxyethyltrimethylammonium chloride with a mass concentration of 0.8% prepared with tap water with the above solution, and stir evenly to obtain the gelling solution of the present invention. The gelling time of the gelling solution was 36 hours at 160° C., and the strength of the obtained jelly was 0.088 MPa, and there was no dehydration phenomenon after aging at 160° C. for 180 days.

Embodiment 3

[0029] Add 0.3g sodium tripolyphosphate, 0.1g sodium aminomethylene phosphonate, 0.06g paraformaldehyde, 0.1g phenol, 0.3g thiourea, 0.1g sodium malonate to 50g of 6% NaCl aqueous solution, stir well , make it fully dissolved, then mix 50g of acrylamide / acryloyloxyethyltrimethylammonium chloride with a mass concentration of 1% prepared with tap water with the above solution, and stir evenly to obtain the gelling solution of the present invention. The gelling time of the gelling solution is 30 hours at 160° C., the strength of the obtained jelly is 0.089 MPa, and there is no dehydration phenomenon after aging at 160° C. for 180 days.

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Abstract

The invention provides a temperature-resistant jelly comprising the following components in percentage by mass: 0.3-0.5% of an acrylamide / acryloyloxyethyl trimethyl ammonium chloride copolymer, 0.1-0.5% of sodium tripolyphosphate or / and amino methenesodium phosphate, 0.05-0.15% of phenol, 0.05-0.1% of paraformaldehyde, 0.2-0.4% of thiourea, 0.05-0.2% of sodium malonate or / and D-sodium erythorbate and the balance of water, wherein the total mass percentages of each component are 100%, the relative molecular mass of the acrylamide / acryloyloxyethyl trimethyl ammonium chloride copolymer is 200*10<4> to 500*10<4>, and the mass content of an acryloyloxyethyl trimethyl ammonium chloride monomer is 10-30%. According to the jelly provided by the invention, the gelling time of the jelly can be adjusted in a range of 15-54 hours, the jelly is excellent in temperature-resistant performance, and a water loss shrinkage phenomenon cannot be caused after the jelly is aged for 180 days at 160 DEG C; and the jelly can be used as a plugging agent applied to near borehole zones and oil well deep parts, and can also be used for sealing steam channeling in a thermal exploitation process of viscous 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...

Claims

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Application Information

Patent Timeline
20 May 2015
Publication
CN104629697A
IPC
C09K8/44
CPC
C09K8/426; C09K8/44
Inventors
张贵才; 陈立峰