Suspension-emulsion composition of anti-turbulent additive

FIELD: oil and gas industry.

SUBSTANCE: suspension-emulsion composition of anti-turbulent additive contains the following, wt %: polyacrylamide with "м.м." 5.5·106 and particle size of not more than 200 mcm - 30-20, polyethyleneglycol - 11-13, stearic acid - 2, ethanol - 42-50 and glycerin - 15.

EFFECT: anti-turbulent additive has decreased viscosity and provides reduction of hydrodynamic friction in oil flow.

8 ex

 

The invention relates to the oil industry, namely the process of pumping water and oil emulsions on commercial pipelines from the wells to the oil treatment plants. It can also be used for energy-efficient pipeline transportation of industrial water. It is known that the introduction to turbulent flow of the fluid very small amount of high molecular weight polymer (less than 0.01% wt.) accompanied by the decrease of hydrodynamic resistance (Toms effect) and leads either to increase the flow rate, or to reduce pressure loss by friction. Energy-saving technologies with the use of polymers soluble in hydrocarbons, are already in use on oil pipelines [Nesin GV, Manga V.N., Popov, E.A. and other Experiment to reduce hydrodynamic resistance oil trunk pipeline Tikhoretsk-Novorossiysk. Pipeline transport. No. 4].

Most of the oil fields of Russia came in late stage of development, so in produced water-oil emulsion, a greater proportion of water which is a dispersion medium. To intensify the delivery of such a mixture requires water-soluble polymer additives. Most of the currently used anti-turbulent additives are songs and mortar type, based on the polymer, which gives the effect, as well as other components. But aqueous solutions of polymers with very high molecular mass (MM>1·106) at a concentration of more than 10% lose fluidity, which makes it impossible for dosing pumps in the pipeline such aspic jelly. A significant drawback of anti-turbulent additives mortar type, in addition to the high viscosity of the concentrate is a low content of useful (polymer) substances is not more than 10%. Shipping large amounts of such additives to the places of its dosing, usually remote and inaccessible, is the event uneconomical due to high transportation costs. Therefore, it is appropriate to transition from viscous concentrates mortar type to a low-viscosity anti-turbulent additives, emulsion-suspension type with the content of useful substances up to 30%. Company "Conoco" developed suspension compositions contain up to 30% of the useful substances in the form of oil-soluble or water-soluble polymers (US Patent No. 5027843, IPC F17D 1/00, 1991; US Patent No. 5504132, IPC F17D 1/00, 1996; US Patent No. 6765053, IPC F17D 1/00, 2004).

The closest in technical essence and the prescription part of the claimed compositions are solutions proposed in the patents (patent CN No. 101268164, IPC F17D 1/17, 2008, p is the tent US No. 2007205392 (A1), IPC C09K 5/10, 2007, US patent 61722151 B1, 2001, patent WO 2412395 C2, 2008, EN 2412395 C2, 20.02.2011). In the patent (CN No. 101268164, IPC F17D 1/17, 2008) recommended dispersion granules of polymeric substances to sizes in the range of 100 μm - 1 mm, which is clearly insufficient for the formation of nerastraivaisya suspension, resistant to sedimentation. In the famous song (US patent No. 2007205392 (A1), IPC C09K 5/10, 2007) as agent for the reduction of the resistance of the claimed polysaccharide. In the patent US 61722151 B1, 2001 as anti-turbulence component is proposed to use polyolefins. In our composition as an agent for reducing hydrodynamic resistance offered polyacrylamide. Part of the famous patent WO 2412395 C2, 2008 contains as an anti-turbulence component polyacrylamide, however, in this patent there is no glycol, performing in the inventive compositions stabilization of the dispersion medium. In another known patent RU 2412395 C2, 20.02.2011 stearic acid and its salts function as lubricants or lubricating substances in the dispersion medium, in our case for improved sedimentation stability and prevent stratification of the dispersion systems.

The present invention is the development of the suspension-emulsion composition to increase its content of hydrodynamically active substances (high is molekulyarnogo polymer) and a simultaneous decrease in the viscosity as compared with the compositions of mortar type, that will make it more adaptable for future use.

The problem is solved in that the suspension-emulsion composition of anti-turbulent additive contains polyethylene glycol, ethanol and glycerol, but unlike the prototype in the composition additionally add polyacrylamide and stearic acid in the following ratio, wt.%:

polyacrylamide - 20-30,

the glycol - 11-13,

stearic acid - 2,

ethanol - 42-50,

glycerin - 15.

The process of obtaining anti-turbulent additives in the suspension-emulsion form consists of three stages:

a) synthesis of high molecular weight sample of polyacrylamide;

b) obtaining a microcrystalline dispersion of polyacrylamide;

C) preparation of a colloidal composition of the fine powder of polyacrylamide and the dispersion medium on the basis of ethanol and polyethylene glycol.

The desired high molecular weight polyacrylamide was synthesized by radical polymerizate by the developed technique and described in our published work [Manga V.N., Sarychev GA, Berezina E.M. sharing viscometric and turbomeeting methods for determining the molecular weight of polyacrylamide. High-molecular compounds, Series B, 2003, vol 45, No. 2, s-368]. As a result of synthesis carried out at the first stage in temp is the temperature 353 K in aqueous solution, containing 10% of monomer (acrylamide) and 0.25% of the initiator (ammonium persulfate), received concentrated aqueous sample solution of polyacrylamide with a molecular mass M=5,5·106. Dynamic viscosity of a 5%aqueous solution of the sample (non-Newtonian fluid) is extremely high and, depending on the shear rate measurements is in the range of η≈10-20 PA·C. With further increase in the concentration of the polymer solutions almost lose fluidity.

The next stage of preparation of the composition is obtaining a microcrystalline dispersion of polyacrylamide in aqueous polymer solution. An aqueous solution of polyacrylamide with a concentration not higher than 1%, while operating the stirrer in a thin stream, pour in the liquid precipitator (ethanol). The result of this procedure gives a subtle dispersion powder polyacrylamide with a particle size of ~200 ám.

At the third stage for fine polyacrylamide prepared dispersion medium of the following composition: 78% ethanol, 20% polyethylene glycol and 2% stearic acid. Then with careful stirring of the dispersion medium (55-65 wt.%) make a powder of the polymer (20-30 wt.%) and add glycerol (15 wt.%). Get a composition consisting of: polyacrylamide - 20-30 wt.%, the glycol - 11-13 wt.%, stearic acid - 2 wt.%, ethanol - 42-50 wt.%, glycerin - 15 wt.%. Dynamic is Kai viscosity of the obtained suspension-emulsion compositions depending on the intensity of mixing of the components in the cooking process, is 0.5-1.0 PA·s, i.e. it is an order of magnitude less than that of an aqueous solution containing a smaller proportion of polymer (5-10%) in a unit volume of solution.

The prepared composition in the suspension-emulsion form is subjected to hydrodynamic testing turbulent rheometer order to clarify its anti-turbulence properties. Turbulent rheometer structurally similar capillary viscometer, but allow exploration of the fluidity of liquid in a wider range of Reynolds numbers, covering both laminar region of the flow, and turbulent. In the working chamber of corporeality for hydrodynamic testing poured 107 cm2the fluid. The magnitude of the effect of reducing the hydrodynamic resistance (DR, %), characterizing the decrease in the energy cost of moving a unit of liquid volume, calculated by the formulain which tSand tP- the days of the expiry of a fixed volume (V=107 cm2=const) of the solvent and polymer solution, respectively.

Example 1. The sample of 0.3 g of the synthesized dispersed in ethanol and dried powder sample of polyacrylamide with a molecular mass M=5,5·106poured 5.7 cm of distilled water and paramasivan and prepare a polymer solution with a concentration of C=50 kg/m 3(5% wt.). 6 g of the obtained concentrated and viscous solution by appropriate dilution (10 liters of water) get a working solution with a concentration of C=0.03 kg/m3(0,003% wt.) to conduct turbomeeting testing. Then the working solution (C=0.03 kg/m3) is passed through a cylindrical channel rheometer in the turbulent flow regime at Re≈8000. Expiry 107 cm3the polymer solution through a cylindrical channel rheometer with a radius of 1.1·10-3m and a length of 0.8 m is tP=5,2, and the expiry time of the same volume of pure water is tS=7,4 sledovatelno, the magnitude of the effect of reducing resistance is DR=51%.

Example 2. Of the polymer solution shown in example 1 (M=5,5·106and C=0.03 kg/m3), by sixfold dilution to prepare a more dilute aqueous solution of polyacrylamide (C=0,005 kg/m3). After conducting hydrodynamic testing anti-turbulence properties of this solution, the resulting decrease in resistance DR=22%. Thus, even in extremely dilute solutions of polyacrylamide solutions with high efficiency.

Example 3. 1 gram of the suspension-emulsion composition containing 30% polymer (0.3 g), dissolved in 10 liters of water (diluted 10,000 times) and get the water working solution with concentration is the situation of polyacrylamide in it 0,003% (=0.03 kg/m 3). Proportionally, 10,000 times, reduced concentrations of all components of the additive in the working solution. In turbomeeting test solution held in the hydrodynamic conditions of example 1, the resulting decrease in resistance DR=49%.

Example 4. After a six-fold dilution of the working solution, obtained in example 3, the hydrodynamic testing by analogy with example 1. The obtained value of DR=21%.

Example 5. 1 gram of the suspension-emulsion composition containing 30% polymer (0.3 g), dissolved in 10 liters of water-oil emulsion (diluted 10,000 times) with oil content (10% wt.) and get direct emulsion (oil - dispersed phase, water - dispersive medium) with a concentration of polyacrylamide 0,003% (=0.03 kg/m3). Proportionally, 10,000 times, reduced concentrations of all components of the additive in the working solution based on water-oil emulsion. In turbomeeting testing of the emulsion is carried out under the conditions of example 1, the resulting decrease in resistance DR=44%.

Example 6. 1 gram of the suspension-emulsion composition containing 30% polymer (0.3 g), dissolved in 10 liters of water-oil emulsion (diluted 10,000 times) with oil content (20% wt.) and get direct emulsion (oil - dispersed phase, water - dispersing the environment) with the concentration of polyacrylamide 0,003% (=0.03 kg/m 3). Proportionally, 10,000 times, reduced concentrations of all components of the additive in the working solution based on water-oil emulsion. In turbomeeting testing of the emulsion is carried out under the conditions of example 1, the resulting decrease in resistance DR=41%.

Example 7. 1 gram of the suspension-emulsion composition containing 20% polymer (0.2 g), dissolved in 10 liters of water (dilution 10 000 times) and get the water working solution with a concentration of polyacrylamide With=0.02 kg/m3. Proportionally, 10,000 times, reduced concentrations of all components of the additive in the working solution. In turbomeeting test solution held in the hydrodynamic conditions of example 1, the resulting decrease in resistance DR=38%.

Example 8. 1 gram of the suspension-emulsion composition containing 20% polymer (0.2 g), dissolved in 10 liters of water-oil emulsion (diluted 10,000 times) with oil content (10% wt.) and get a working "solution", which is an emulsion (oil - dispersed phase, water - dispersive medium) with a concentration of polyacrylamide With=0.02 kg/m3. Proportionally, 10,000 times, reduced concentrations of all components of the additive in the studied emulsions. In turbomeeting test emulsion with the dissolved polymer, Prov is effected in the conditions of example 1, the resulting decrease in resistance DR=31%.

Thus, the translation of anti-turbulent additives mortar type (polymer concentration of 5 wt.%) in the suspension-emulsion composition (polymer content of 30 wt.%) accompanied not only by an increase in the share of useful substance in unit volume of the additive, but also a substantial reduction in the viscosity of the composition that significantly optimizes its technological properties when entering into the process line, which is in operational mode under high pressure. The slight decrease in the efficiency of polymer additives in the transition from pure water to a water-oil emulsion is explained by the deterioration of thermodynamic quality of the solvent (dispersion medium) and partial adsorption of PAA macromolecules on the oil droplets of the emulsion.

Suspension-emulsion composition of anti-turbulent additives polyethyleneglycol, ethanol and glycerol, characterized in that it further comprises a polyacrylamide of molecular weight M=5,5·106and a particle size of not more than 200 μm, stearic acid, in the following ratio, wt.%:

polyacrylamide30-20
the polyethylene glycol11-13
stearic acid2
ethanol42-50
glycerin15



 

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