The method of disposal of incompatible waters

 

(57) Abstract:

The invention relates to treatment of wastewater and can be used for injection of incompatible waters into the reservoir in the oil industry. For the implementation of the method of disposal of incompatible water - hydrogen sulfide-containing and iron-containing wastewater spend their preparation and subsequent injection into the reservoir, as chelat forming agent used chemical product "IOS", which is injected into the hydrogen sulfide stream and the injection of iron and hydrogen sulfide water in one well is alternately packs. Introduction chemical product ions" is carried out in an amount of 20 g per 1 m3the injected water. The method provides lower attenuation injectivity of injection wells and reducing the consumption of chelat forming agent. 1 C.p. f-crystals, 1 tab., 1 Il.

The invention relates to the oil industry and can be used for injection of incompatible waters into the reservoir.

It is known that incompatible water extracted along with oil from different layers (for example, the Devonian - iron and tournaisian - hydrogen sulfide), after treatment (sedimentation, degassing and together in one or the other reservoir through one hole, the formed iron sulfide, which clogs the bottomhole formation zone and the injection capacity of the well damped, and as a consequence, the selection of oil from oil-containing reservoir falls.

A known method for simultaneous purification and utilization of hydrogen sulfide-containing and iron-containing waste water, including clean them from the oil and solids, serial input in iron-bearing water disodium salt ethylenediaminetetraacetic acid (Trilon B), mixing of different sorts of waters and their discharge into the absorption well [1].

The disadvantages of this method are the fast attenuation of the injection wells and the high consumption of disodium salt of ethylenediaminetetraacetic acid.

The purpose of the invention is to reduce the damping of the injection wells and reducing the consumption of chelat forming agent.

This objective is achieved in that in the method of disposal of incompatible waters, including their preparation and subsequent injection into the reservoir, as chelat forming agent used in chemical product "IOS", which is introduced into the hydrogen sulfide-containing stream, and pumping iron and hydrogen sulfide water in one well is alternately pack hometelephone groups, obtained by the interaction of aminecontaining compounds or mixtures thereof with formaldehyde and phosphorous acid in hydrochloric acid environment. In order to obtain chemical product ions" with low cost as aminecontaining compounds used waste ion-exchange resins, polyethylenepolyamine, urea and other products [2 - 4]. Chemical product "IOS" is produced in accordance with TU 6-05-211-1153-80.

"IMS" at ordinary temperature does not emit volatile substances, non-explosive and non-flammable. Is a uniform yellow-brown liquid with a basic substance content in the range of 30 - 40%, the freezing temperature of minus 30oC, pH within 3,6 - 3,9.

Evaluation of the toxicity of chemical product ions" through calculation of physico-chemical constants and toxicity characteristics, taken by analogy. As a result calculated levels in the air of working zone 18 mg/l in water of 4 mg/L.

The method is as follows.

Waste water from different horizons (Devonian and tournaisian) come to their groups of settling tanks in which the water purification from mechanical impurities and oil.

Alternate injection packs fluids containing hydrogen sulfide water with the addition of IMSA and iron rich water can reduce the attenuation of the injectivity of injection wells.

The study of the damping of the injection well conducted in the cylinders and sedimentation tanks with a diameter of 54 mm and a height of 2500 mm, the lower part of the cylinder-settlers height of 1000 mm was filled with quartz sand fraction of 0.1 - 0.3 mm In the lower part of the cylinder was located plug with filter and outlet fitting.

Through the cylinders-the settlers (model well) was passed hydrogen sulfide and iron-containing waste water containing H2's 150 mg/l and iron ions 63 mg/l discharged from the tanks to the tanks after cleaning them from the oil and solids.

Disposal of incompatible waters show is atuanya pickup model of the wells listed in the table.

From the data given in the table, it follows that by a known method (N 1) after 8 days of pumping pickup model wells decreased by 80%, according to the method prototype (N 2) after 8 days of pumping pickup model wells decreased by 40%, and the proposed method (N 3) after 8 days of pumping model wells decreased by only 15%.

Thus, reducing pickup model well the proposed method is smaller than in the prototype method, 25% for the same time pumping incompatible waters.

Sources of information

1. Auth. St. USSR N 916443, class C 02 F 9/00, BI N 12, 1982 (prototype).

2. Auth. St. USSR N 703545, BI N 46, 1979.

3. Auth. St. USSR N 719970, BI N 9, 1980.

4. Auth. St. USSR N 726123, BI, No. 3, 1980.

1. The method of disposal of hydrogen sulfide and iron-containing wastewater by provisioning - degassing, sedimentation and sediment removal, introduction chelat forming agent, subsequent mixing and injection into the formation via the injection well, wherein as chelat forming agent used chemical product "IOS", which is injected into the hydrogen sulfide stream and the injection of iron and hydrogen sulfide water in one well implemented the MS is carried out in an amount of 20 g per 1 m3the injected water.

 

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