Environment-friendly composite dirt dispersion agent for oil-field flooding treatment

Abstract

The invention belongs to the technical field of industrial water treatment, and particularly relates to an environmental protection type composite dirt dispersion agent used for oil field water flooding treatment. The dirt dispersion agent takes polyasparagic acid, polyepoxy sodium succinate and hydrolyzed polymaleic anhydride as effective components; and the total content of the effective components is no less than 35 percent. The weight ratio of the effective components of polyasparagic acid: polyepoxy sodium succinate: hydrolyzed polymaleic anhydride is 4-12.5:1-5: 5-9. The environmental protection type composite dirt dispersion agent is phosphorus free, innocuous and biologically degradable, and has low use cost. The environmental protection type composite dirt dispersion agent can effectively prevent the sedimentation of calcium carbonate, calcium sulphate and barium sulphate, and is suitable for the dirt dispersion treatment in an oil field water flooding system.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to an environment-friendly composite anti-scaling and dispersing agent for oil field water injection treatment. Background technique [0002] In recent years, with the rapid development of the economy, my country's demand for oil is increasing, and oil production has become an important industry related to the lifeline of the national economy. At present, most oil fields in our country are in the middle and late stages of development, and water injection development has become a main way to enhance oil recovery. However, with the deepening of exploitation, two important problems have also been brought to the oilfield production: one is that the amount of water injection is increasing, and the water source of the injected water is increasing; the other is that the amount of oily sewage is increasing, and the discharge of sewage and solving issues. In ...

AI Technical Summary

Problems solved by technology

However, with the deepening of exploitation, two important problems have also been brought to the oilfield production: one is that the amount of water injection is increasing, and the water source of the injected water is increasing; the other is that the amount of oily sewage is increasing, and the discharge of sewage and solving issues

[0009] Although there are many kinds of scale inhibitors on the market, there are still some problems in the following aspects when they are used in oilfield water injection treatment: (1) The scale inhibition effect of scale inhibitors is not ideal

There is a big difference between oilfield sewage and circulating cooling water. The concentration of metal ions contained in oilfield sewage is much higher than that in circulating cooling water, so many antiscalants have poor antiscaling effect on them.

(2) Oilfield sewage contains barium sulfate, which has low solubility in water, and many scale inhibitors have poor scale inhibition effect on it

(3) Many scale inhibitors have a single scale inhibition effect, and there are not many scale inhibitors that have a good scale inhibition effect on all scales in oilfield sewage, and can only treat one or two of several scales in oilfields For example, although PBTCA has good scale inhibition performance on calcium carbonate, it has no effect on sulfate scale (calcium, barium). Although PAA has good scale inhibition performance on calcium carbonate and calcium sulfate, it has no effect on barium sulfate scale. Dirt effect is poor

(4) Many antiscalants contain phosphorus or are refractory to biodegradation, which will cause certain pollution to the environment

And among the published patents, there are no reports on the use of polyepoxysuccinic acid and polyaspartic acid in oilfield water injection treatment, and there are not many types of compound formulations for circulating cooling water treatment, only a few examples, such as the United States Patent US.Pat.No.5256332 provides a kind of polyepoxysuccinic acid and orthophosphate, AA / AHPSE (acrylic acid / allyl hydroxypropyl sulfonate ether copolymer), TTA (tolyltriazine azole) to form a low-phosphorus formula to treat industrial cooling water; US Patent US. Phosphorus formula handles industrial cooling water; U.S. Patent US.Pat.No.6585933B1 provides a kind of by polyepoxysuccinic acid and AA / AHPSE (acrylic acid / allyl hydroxypropyl sulfonate ether copolymer), NBT{3 , 3′-(3,3′-dimethoxy-4,4′-biphenyl)-bis-[2-p-nitrobenzene-dihydro-tetrazole chloride} composition of phosphorus-free formula treatment industry Cooling water; U.S. Patent US.Pat.No.6277302B1 provides a phosphorus-free formula composed of polyaspartic acid, molybdic acid, and Zn to treat industrial cooling water; Chinese patent ZL200510001802.5 provides polyepoxysuccinic acid , molybdate, organic phosphate, and imidazoline-based low-phosphorus formulations for industrial circulating cooling water

[0011] At present, polyepoxysuccinic acid (PESA) and polyaspartic acid (PASP) are the formulations used for the treatment of oilfield water injection as main components. There is no report on the synergistic effect of scale inhibition between polyepoxysuccinic acid and polyaspartic acid, which limits the popularization and application of polyepoxysuccinic acid and polyaspartic acid in oil field water injection

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