Composition for preventing inorganic scaling

 

(57) Abstract:

The invention is intended to prevent inorganic scaling pumping and oilfield equipment. The composition contains the following ratio of components, wt.%: from 0.1 to 0,125 polymeropoulos acid, from 0,375 to 0.9 sodium salt of polyacrylic acid, the rest is water or an aqueous solution of ethylene glycol. The composition is effective and has a lower unit cost, supply the composite solution in terms of oil production from the well with any pressure, any permeability of the reservoir, any degree of watering. 3 table.

The invention relates to the oil and gas industry and can be used to combat deposits of insoluble inorganic salts accumulated in the pumping and oilfield equipment in the process of production, preparation and transportation of oil.

The deposition of salts on the walls of the borehole and pumping equipment complicates the extraction of oil, leads to damage expensive equipment. The main source of scaling - mineralized water associated with oil production. Its chemical composition is constantly changing as they age sopjani in the extraction of oil and gas from wells, contains, wt%:

nitrilotrimethylphosphonic acid of 0.2-0.5

hydrochloric acid 8,0-13,0

silicofluoride-hydrogen acid 1,0-3,0

water the rest

The effect of the composition is mainly aimed at preventing sediment sulfate salts and is completely ineffective against carbonate salts. The presence of a mixture of hydrochloric acid makes the composition of the corrosive. In addition, this composition cannot be used in low temperatures.

At the present time to prevent salt deposits used different inhibitors containing organophosphorus compounds, as a rule, stand-alone actions.

So, a well-known inhibitor of PAF-13A (hereinafter PAF-13), which is manufactured by JSC “Khimprom” TU-6-02-1346-87. The inhibitor is an aqueous solution of compounds polymeropoulos acid from light orange to brown [2. RD 39-0148070-WII-86, the Guide application techniques inhibitor salt deposits PAF-13-winter in producing wells, Tyumen, Sibniinp, 1986].

The disadvantage of PAF-13 winter is its low efficiency, which does not exceed 50% in the concentration range from 0-60 mg/l

The technical problem faced by the inventor, is to develop a composition to prevent the formation of salts on the walls skvazhina-pumping equipment at any stage of the watering hole.

To solve the problem in part, intended to prevent inorganic scaling in wells containing-diaminomethylene acid, added sodium salt of polyacrylic acid in the following ratio wt.%:

palominoalethea acid of 0.1-0,125

sodium salt of polyacrylic acid 0,375-0,9

water or an aqueous solution of ethylene glycol else

It should be noted that known inhibitor Nalex-D manufactured by the national Starch (UK) on the basis of the sodium salt of polyacrylic acid. This inhibitor has not found wide application in the domestic oil industry due to its high cost.

Each of the components (the original inhibitors) of the new composition has a specific action on a specific type of salt precipitate. Inhibitor Nalex-D (sodium salt of polyacrylic acid) okeedokee deposition mainly of carbonate salts. Solution components forms a homogeneous composition, the effectiveness of which is to prevent the formation of salts on oilfield equipment enhanced by synergism developed composition.

To use the composition in winter conditions it added to the ethylene glycol in the amount of 50-60 wt.%.

The optimal ratio of components, wt.%:

palominoalethea acid (PAF 13) 0,125

sodium salt of polyacrylic acid (Nalex-D) 0,375

water or an aqueous solution (55-60%) of ethylene glycol else

Research on the effectiveness of compositions performed in laboratory conditions by the known methods described in EP 39-0148070-WII-86. On the basis of experimental data constructed table 1.

The studies have used a 0.5% solutions of inhibitors and mixtures of inhibitors. The solutions were prepared immediately before testing.

The results of laboratory tests showed that the most active component is an inhibitor Nalex-D. Results to determine the optimal composition of the mixture showed that the most active is a mixture, where the content of the components D:PAF=0,375:0,125.

According to the obtained results, we construct table 2.

The dependence of the ESM/EA content Nalex-D represents a curve of extremal points. It allows you to define the valid content Nalex-D in a mixture, in which the efficiency of inhibition of the mixture (ESM) will exceed the additive efficiency (EA) at different unit costs.

One of the criteria when selecting the inhibitor and the magnitude of his dosage is to provide the required level of efficiency of inhibition. Table 2 allows you to choose the composition of the mixture and the specific flow rate at which the mixture shows the greatest efficiency, and also allows you to numerically evaluate the synergistic effect.

The results presented in table 2 can be divided into three parts, each of which corresponds to a content Nalex-D in a mixture of:

in the field of 0-0,35 weight. % the content is the spine of additivity;

in the field of 0.35-0,425 weight. % the efficiency of the mixture or higher efficiency, additivity, or its equivalent, and with a ratio of D:PAF - 0,375:0,125 observed maximum, which characterizes the most active mixture. The effectiveness of the mixture at this point higher than the efficiency of additivity 1.42 times (for mixture concentration of 5 mg/l);

region 0,425-0,5 weight. % area of antagonism.

The synergistic effect depends on the total concentration of the mixture. With increasing concentration it decreases, while the effect of antagonism increases (mixture with a concentration of 30 and 60 mg/l do not have a synergetic effect on the whole range of Nalex-D in the mixture).

Studies have shown that the optimal ratio of components in the mixture is Nalex-D:PAF-13=0,375:0,125, and workspace concentrations up to 30 mg/l

An important factor in the selection of inhibitors is the value of the unit cost. Recommended songs inhibitors, inhibitors Nalex-D and PAF-13, were calculated costs for the purchase of each inhibitor that is required to process 1000 m3water at different levels of efficiency of inhibition. The cost of the inhibitor Nalex-D in the calculations were taken 5040 USD /t, and PAF-13A 36,000 relatione compared with the known compounds has new properties, not a simple summation of their known properties. Compared with the prototype and individual components of inhibitors of the proposed structure is more efficient and has a lower unit cost. Supplied composite solution in terms of oil production from the well with any pressure, any permeability of the reservoir, any degree of watering.

These advantages allow:

to use a more efficient way of periodic injection of the inventive composition into the annulus producing wells;

to prevent the deposition of salts and operational column;

conduct technical processing of wells in the value of the water content above 50%;

promote the efficient use and solution composition to determine the optimum content of her in produced water;

components included in the composition, does not affect the quality of the oil.

Composition for preventing inorganic scaling, including derivative of phosphonic acid, characterized in that it further comprises the sodium salt of polyacrylic acid at Lacrimosa acid 0,325-0,9

Water or an aqueous solution of ethylene glycol Else

 

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FIELD: soft abrasive materials based on mixed aluminum and iron oxides.

SUBSTANCE: method includes blending of raw components and subsequent heat treatment. Solutions of aluminum and iron sulfate with ammonia bicarbonate admixture heated to 40-600C are used as raw materials to produce slurry of aluminum and iron bicarbonates. Precipitate is separated by filtration, washed and dried. Heat treatment is carried out at 1150-12000C to provide solid solution expressed by general formula Al2-xFexO3, wherein x = 0.30-0.37. Mass part of iron oxide in finished product is 20-25 mass %. Abrasive materials of present invention are useful for finished polishing of metal parts, have polishing ability of 0.37-0.40 mg/min.cm2, provide roughness RZ = 0.07-0.08 mum after polishing and 85-90 %-yield of high-precision accepted metal parts.

EFFECT: environmentally friendly abrasive materials of improved quality.

1 cl, 3 ex, 1 dwg

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