Gel double-solution plugging regulating agent of steam injection well for thermal recovery and plugging regulating method using gel double-solution plugging regulating agent
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A technology of steam injection well and plugging agent, which is applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve problems such as uneven steam absorption, and achieves extended gel strength, good thermal stability, and simple preparation process. Effect
Inactive Publication Date: 2014-06-18
NORTHEAST GASOLINEEUM UNIV
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[0005] The object of the present invention is to provide a kind of gel two-liquid plugging regulating agent for thermal production steam injection well, another object of the present invention is to provide the plugging regulating method of this
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Embodiment 1
[0022] 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
[0024] Preparation of thermal recovery steam injection well gel two-liquid plugging agent,
[0025] 1. the 6wt% sodium nitro humate prepared by Example 1 is dissolved in water by weight, and the pH is adjusted to neutrality. After fully dissolving, it is dissolved into 1.2wt% formaldehyde by weight, and the first solution is obtained after fully dissolving. Working solution, the solution is dark brown;
[0026] 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;
[0027] ③ Add the second working fluid to the first working fluid, stir for 40 minutes until fully mixed, and obtain the thermal recovery steam injection well gel double-liquid plugging regulator, which is a dark brown solution.
[0028] The above-mentioned weight fractions are the percentages of each component in the total weight of the prepared thermal recovery and injec...
Embodiment 3
[0036] Preparation of thermal recovery steam channeling control gel-type two-liquid plugging agent,
[0037] In this example, sodium nitrohumate by weight is 6wt%, formaldehyde is 1.2wt%, resorcinol is 2.2wt%, HPAM (polyacrylamide) is 0.03wt%, and others are the same as in Example 2 . In this embodiment, it is measured through experiments: the gelling time of the system is 8-9 hours, the gelling viscosity is 37592 mPa·s, and the plugging rate is greater than 97%.
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Abstract
The invention relates to a gel double-solution plugging regulating agent of a steam injection well for thermal recovery and a plugging regulating method using the gel double-solution plugging regulating agent. The gel double-solution plugging regulating agent is a dark brown solution prepared by dissolving and mixing a first working solution and a second working solution in formation water at a normal temperature, wherein the first working solution is composed of sodium nitrohumate and formaldehyde and is black brown and slightly sticky; the second working solution is composed of resorcinol and a coagulant aid HPAM (Hydrolyzed Polyacryamide) and is colourless and slightly sticky and free of pungent smell; the first working solution comprises the two components by weight percent as follows: 6% to 7% of sodium nitrohumate and 1.2% of formaldehyde and the second working solution comprises the two components by weight percent as follows: 2.2% of resorcinol and 0.015% to 0.035% of HPAM; and the sodium nitrohumate is prepared by steps of carrying out a nitration modification reaction on sodium humate and 65% concentrated nitric acid in a condensation reflux device at 90 DEG C, and stirring and drying by distillation, wherein the weight ratio of sodium humate to 65% concentrated nitric acid is 1:6. According to the method, a high-permeable channel is plugged preferentially, so that the gel can be transported in a glue ball manner after being sheared. Thus, the purpose of deep profile control is reached. The gel double-solution plugging regulating agent has a subsequent oil-stabilizing and water-controlling ability.
Description
[0001] 1. Technical field: [0002] The invention relates to a profile control agent used in oil field chemical water plugging and profile control technology in petroleum engineering, in particular to a gel double-liquid plugging regulating agent for thermal recovery and steam injection wells and a plugging regulating method thereof. 2. Background technology: [0003] Steam flooding is currently the key technology for improving the recovery of heavy oil reservoirs in China. As the development enters the middle and later stages, the heterogeneity of the reservoir causes uneven steam absorption profiles in the vertical direction, which is prone to steam channeling. The high-temperature plugging control technology can Force the steam to turn, expand the swept volume, and improve the utilization rate of steam. At present, domestic high-temperature profile control mainly adopts three methods to deal with conflicts between different layers: plugging, plugging adjustment, and flood...
Claims
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