Self gas generation foam-gel profile control agent prepared from oilfield reinjection water as well as preparation method and application thereof
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A technology for re-injecting water and profile control agent in oilfields, which is applied in the field of the preparation of self-generating foam jelly, can solve the problems of high water temperature and high salt content in the re-injection water, and achieves the advantages of reducing liquid discharge speed, good foam stability and reducing pollution. Effect
Active Publication Date: 2014-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
However, in order to save water resources, reduce the pollution of oilfield sewage to the environment, and reduce costs, many oilfields currently require oilfield reinjection water to prepare profile control agent liquids. Due to the high salt content and high water temperature of reinjection water, the existing technology cannot achieve this. Require
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Embodiment 1
[0047] Polyacrylamide (degree of hydrolysis 27.8%, molecular weight 15 million) 0.2%, chromium malonate crosslinking agent 0.2%, NH 4 Cl2.0%, NaNO 2 1.6%, 0.15% propionic acid (catalyst), 0.3% OP-10 foaming agent, 3% sodium gluconate stabilizer, and the rest is oilfield reinjection water (40°C).
[0048] Preparation:
[0049] Dissolve the polyacrylamide with oilfield reinjection water for 4 hours, after the dissolution is complete, then add other components, stir and dissolve evenly.
[0050]Glue test results:
[0051] The prepared profile control agent solution, under the condition of water temperature of 40°C, will not form gel after being placed for 72 hours, which provides a guarantee for the safety of construction. At 50°C, the gelation time is 6 hours, the breakthrough pressure is 1.69MPa, and the plugging rate is 99.7%.
Embodiment 2
[0053] As described in Example 1, the difference is that the amount of propionic acid is 0.10%.
[0054] The prepared profile control agent solution, under the condition of water temperature of 40°C, is placed for 72 hours without gelling. At 50°C, the gelation time was 10 hours, the breakthrough pressure was 2.91MPa, and the plugging rate was 99.8%.
Embodiment 3
[0056] As described in Example 1, the difference is that the amount of propionic acid is 0.05%.
[0057] The prepared profile control agent solution will not form a gel when placed at a water temperature of 40°C for 72 hours; at 50°C, the gelation time is 24 hours, the breakthrough pressure is 4.53MPa, and the plugging rate is 99.9%.
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Abstract
The invention relates to a self gas generation foam-gel profile control agent prepared from oilfield reinjection water and a preparation method and an application of the agent. The self gas generation foam-gel profile control agent is prepared from the following components: 0.1-0.3% of polyacrylamide, 0.1-0.3% of a cross-linking agent, 2.0% of NH4Cl, 1.6% of NaNO2, 0.05-0.15% of a catalyst, 0.2-0.5% of a foaming agent, 1-5% of a stabilizing agent and the balance of oilfield reinjection water. The preparation method comprises the steps of dissolving polyacrylamide by using oilfield reinjection water firstly, and secondly adding other components to be uniformly dissolved. The self gas generation foam-gel profile control agent is used for profile control on oilfield reinjection water, and can be also applied to increase production through fracturing, acidification and fuel scavenge; the foam-gel profile control agent is good in salt resistance, the liquid can be prepared by using oilfield reinjection water with high-salinity temperature, the water resource is saved, and the oil-water pollution is reduced; the agent is not cross-linked with being placed at high temperature for a long time, so that construction security is ensured; after the agent is filled into a stratum, foam and gel cross-linking is formed simultaneously, and the foams are uniformly dispersed in the gel with high strength.
Description
technical field [0001] The invention relates to the preparation of self-generating foam jelly which can be used for profile control of oilfield water injection wells and is prepared with oilfield reinjection water, and belongs to the technical field of oilfield chemical foam jelly profile control agents. Background technique [0002] Foam jelly is a dispersion system in which gas is uniformly dispersed in the gel, and it is formed by foaming a foaming agent, a crosslinking agent and a polymer solution under the action of gas. The high-strength polymer network structure formed by the polymer and the cross-linking agent has good stability to the foam liquid film. Stablize. [0003] The blocking mechanism of the foam jelly layer is mainly: the foam jelly is in the water-wet pore medium, the polymer gel adheres to the inner wall of the pore, occupies the pore throat, fills the pore space, and under the action of huge capillary pressure The passage of the non-humid gas phase is...
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