A gel-type two-liquid plugging agent for thermal recovery steam channeling control and its plugging method
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A gel-like, steam-channeling technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., to achieve the effects of favorable plugging construction operations, enhanced temperature resistance, and good thermal stability
Inactive Publication Date: 2016-08-17
NORTHEAST GASOLINEEUM UNIV
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[0003] The object of the present invention is to provide a kind of gel-type two-liquid plugging agent for thermal recovery steam channeling control, and another object of the present invention is to provide a plugging method for this thermal recovery steam channeling control gel-type two-liquid plugging agent, It is used to solve the problem of steam channeling in high-permeability layers in steam flooding in heavy oil reservoirs
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Embodiment 1
[0021] To prepare high-temperature-resistant main agent sodium nitrohumate, mix industrial grade sodium humate and 65% concentrated nitric acid (by weight) in a ratio of 1:6, pass through a condensing reflux device at 90°C, and undergo nitrification modification reaction, After stirring for 3 hours, it was evaporated to dryness, and sodium nitrohumate was finally obtained as dark brown powder, which was acidic.
Embodiment 2
[0023] Preparation of gel-type two-liquid plugging agent for steam channeling control in thermal recovery,
[0024] 1. the 6wt% sodium nitro humate prepared by Example 1 is dissolved in water by weight, adjusts the pH to neutrality, dissolves into 1.5wt% formaldehyde by weight after fully dissolving, and obtains the first Working solution, the solution is dark brown;
[0025] ② Dissolve 0.015wt% polyacrylamide by weight in water, and after fully swelling at a speed of less than 100r / min, add 2.2wt% resorcinol by weight and stir until completely dissolved. color viscous;
[0026] ③ Add the second working fluid to the first working fluid, and stir for 40 minutes until fully mixed to obtain a black-brown solution of a gel-type dual-liquid plugging agent for thermal recovery steam channeling control.
[0027] The above-mentioned weight fractions are the percentages of each component in the total weight of the prepared thermal recovery steam channeling treatment gel-type two-liqu...
Embodiment 3
[0035] Preparation of gel-type two-liquid plugging agent for steam channeling control in thermal recovery,
[0036] In this example, sodium nitrohumate by weight is 6wt%, formaldehyde is 1.5wt%, resorcinol is 2.2wt%, HPAM (polyacrylamide) is 0.03wt%, and others are the same as in Example 2 , this embodiment is measured through experiments: the gelling time of the system is 6-7 hours, and the gelling viscosity is 9.42×10 5 mPa s.
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Abstract
The invention relates to a gel double-fluid plugging agent for thermal recovery steam channeling governance and a blocking method thereof. The gel double-fluid plugging agent for thermal recovery steam channeling governance is a black brown solution formed by first working liquid and second working liquid dissolved and mixed in formation water at normal temperature, wherein the first working liquid is formed by sodium nitrohuma and formaldehyde, the solution is black brown and slightly sticky, the second working liquid is formed by resorcinol and a coagulant aid hydrolyzed polyacryamide (HPAM), the solution is colorless and slightly sticky, and is free of irritating smell; two components in the first working liquid and two components in the second working liquid respectively are 5-6wt% of sodium nitrohumate, 1.5-1.8wt% of formaldehyde, 2.2% of resorcinol, and 0.015-0.035wt% of HPAM according to the total weight. A quaternary copolymer gel plugging agent applicable to thermal recovery steam channeling governance of thickened oil provided by the invention is low in initial viscosity, good in abrasion resistance, good in heat stability, and can be washed and unplugged along with steam for a long period of time, and the stemming ratio on a high-permeability layer is greater than 97%.
Description
1. Technical field: [0001] The invention relates to a profile control agent used in oilfield chemical water plugging and profile control technology in petroleum engineering, in particular to a gel-type two-liquid plugging agent for thermal recovery steam channeling control and a plugging method thereof. 2. Background technology: [0002] Steam flooding is currently the key technology for improving the recovery of heavy oil reservoirs in China. As the development enters the middle and late stages, it is facing problems such as steam channeling in heterogeneous reservoirs, which causes the water content of the produced fluid to increase, sand production, and lifting difficulties. , put forward the plugging operation in the steam injection well, aiming at the high-permeability layer with serious steam channeling, high-temperature plugging technology is used to force the steam to divert, expand the swept volume, and improve the utilization rate of steam. At present, domestic hig...
Claims
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