The method of selection of potentially effective agents for removing and preventing deposits maloperation

 

(57) Abstract:

The invention relates to the oil industry, mainly to the development of deposits of paraffin oil with the use of chemicals to remove and prevent maloperation sediments. The technical result of the invention is to increase the accuracy of selection of potentially effective agents for the removal and prevention maloperation sediments in this field, which would take into account the properties of oil and physico-geological conditions of the Deposit. This effect of electromagnetic field on this oil and reagents. Measure the dielectric characteristics of the reservoir oil in the frequency range 107-109Hz at temperature and pressure conditions in this field. Determine frequency ftfTrcorresponding maximum values of tangent of dielectric loss angle for oil and reagent, and frequency f1Hf2nf1pf2pfrom the following expression: where tgntangent of dielectric loss angle for oil; tgmn- the maximum value of the tangent of dielectric loss angle for oil; tgptangent of dielectric loss angle for the reagent, tgmpmA is the magnetic field, when tgn= 0,7 tgmn; f1pf2p- frequency electromagnetic field, in which tgp= 0,7 tgmp. Then select potentially effective reagents from the condition that at least one of the frequencies fTrf1pf2pis in the range of f2n-f1H. The temperature range in which the measured dielectric characteristics should include the temperature of crystallization of the wax in the oil, which is different for different oils. 3 Il.

The invention relates to the oil industry, mainly to the development of deposits of paraffin oil with the use of chemicals to remove and prevent maloperation deposits.

Known control method [A. S. 927977 (USSR). The control method for the processing layers reagents. Revision Y. C., Dyblenko B. N., sahow F. L. et al. - BI 18, 1982] for handling layers of reagents, which consists in the fact that it is held on the surface of fluid sampling and analysis before and after injection of reagents in the reservoirs, samples of liquid influence of the electromagnetic field in the frequency range 107-109Hz, determine the tangent of dielectric loss angle, the largest of which is judged on the concentration reaoy layers reagents. In this way not envisaged the selection of an appropriate reagent, and determining its effectiveness. In this way not determined by the maximum value of the tangent of dielectric loss angle depending on the frequency, so you cannot judge the concentration of the polar components of crude oil and reagent.

The closest analogue of the invention are methods of determining the effectiveness of reagents for removal and prevention maloperation deposition [Revision Y. C., sahow F. L., Dyblenko Century. P. and others About one way of determining the effectiveness of reagents for removal and prevention maloperation sediments. -PH-TC, Petroleum engineering, 1980, vol. 5, S. 35-38], which determine the dependence of the tangent of dielectric loss on frequency and conditions approximate location of the frequencies corresponding to the maximum value of tgmfor oil and reagent (or reagent solution), in a certain range is judged qualitatively about the effectiveness of the reagent.

The disadvantage of this method is the low accuracy of selection of reagents for removal and prevention maloperation sediments in this field, resulting in lower affectee increase the accuracy of selection of potentially effective agents for the removal and prevention maloperation sediments in this field, which would take into account the properties of oil and physico-geological conditions of the Deposit.

Technical result is achieved by the influence of electromagnetic fields on this oil and reagents, measuring the dielectric characteristics of the reservoir oil in the frequency range 107-109Hz at temperature and pressure conditions of this Deposit, the definition of frequency fmnfmpcorresponding maximum values of tangent of dielectric loss angle for oil and reagent and frequency f1Hf2nf1pf2pfrom the following expression:

< / BR>
where tgntangent of dielectric loss angle for oil,

tgmn- the maximum value of the tangent of dielectric loss angle for oil,

tgptangent of dielectric loss angle for the reagent,

tgmp- the maximum value of the tangent of dielectric loss angle for the reagent,

f1Hf2n- frequency electromagnetic field, in which tgn= 0,7 tgmn,

f1pf2p- frequency electromagnetic field, in which tgp= 0,7 tgmp.

Then select potentially effective reagents from the condition that at least one of the frequencies fmpf1pf2p

One of the conditions for effective selection of reagents for this oil is the coincidence of the frequencies corresponding to the maximum value of tgmfor oil and reagent (or reagent solution) fmn=fmp(Fig.1), other acceptable condition may be the presence of frequency fmp in the area of the width of the resonance curve for oil fmpf1Hf2n(Fig.2). The real measure effective selection of reagents for this oil can be used as a crossing width of the resonance curves for oil fnand for the reagent fp(Fig.3).

In Fig.1 presents the dependence of tg(f) for oil vyngapurovskogo field and inhibitor snpch-7214 frequency electromagnetic field at temperature T=273 K, P=0,41 MPa. The dependence of tg(f) 1 - oil 2 - for the reagent snpch-7214, fmn=135 MHz, fmp=135 MHz; fm= fm/2.

In Fig. 2 shows the frequency dependence of tg(f) for oil and chemicals, TNK=313 K: dependence of tg(f) 1 - for oil SLE. 66 Igruskoj square; 2 - reagent MYUNG-204, effective for the given field; 3 - for inefficient Reagan EFTA and inhibitor ASPO IPS-2: 1 - for paraffin inhibitor of IRS-2; 2 - for the Estonian oil; 3 - North Varyeganskoe oil.

Example 1. Laboratory studies in the frequency range 107-109MHz tangent of dielectric loss angle oil selected from reservoir BV8Vyngapurskoe field and inhibitor snpch-7214 depending on the frequency of the electromagnetic field. Research is conducted at a pressure of P= 0,41 MPa and a temperature T=273 K. On experimental data Fig.1 for oil Vyngapurskoe field and inhibitor snpch-7214 (fmnfmp135 MHz. Studies suggest that the paraffin inhibitor snpch-7214 can effectively work in conditions Vyngapurskoe field.

Example 2. Analogously to example 1 studies of tangent of dielectric loss with frequency for tg(f) for oil selected from SLE. 66 Igruskoj square NGDU Krasnoholmskneft and reagents MYUNG-204, proglet in the frequency range 107-109MHz at the temperature of crystallization of this paraffin oil TNK=313 K. According to Fig.2 (curves 1,2,3) for oil SLE. 66 and reagent MYUNG-204 fmnfmp140 MHz, and for prevalite fmp160 MHz. This suggests that MYUNG-204 effective and proglet - not what you frequency dependence of tg(f) anhydrous oils SLE. 545 Tallinn field (TNK= 303,91 To, the content of asphaltenes to 1.35% resins 5,26%, paraffin 3,75%), and SLE. 589 North Varieganskoe field (TNK=300,27 To, the content of asphaltenes of 0.75%, resins 2,59%, paraffin 2,93%) and reagent of IRS-2 in the frequency range of 80-200 MHz (Fig.3). From the graphs it is seen that fmfor the reagent of IRS-2 and Tala oil have approximately the same values 100-102 MHz, and for oil North Varieganskoe field fm= 125 MHz. In accordance with the above inhibitor deposition of paraffin DRS-2 is an effective reagent for oil SLE. 545 Tala field and inefficient for oil SLE. 589 North Varieganskoe field at a temperature 300,91 K.

The method of selection of potentially effective agents for the removal and prevention maloperation deposits, including the sampling reservoir oil, the effects of electromagnetic field on this oil and reagents, the definition of tangent of dielectric loss angle tg(f), characterized in that measure the dielectric characteristics of the reservoir oil in the frequency range 107-109Hz at temperature and pressure conditions in this field, define the frequency ftfTrcorresponding to the/SUB> f1pf2pfrom the following expression:

< / BR>
then select potentially effective reagents from the condition that at least one of the frequencies fmpf1f2Pis in the range of f2n-f1H,

where tgntangent of dielectric loss angle for oil;

tgmn- the maximum value of the tangent of dielectric loss angle for oil;

tgptangent of dielectric loss angle for the reagent;

tgmp- the maximum value of the tangent of dielectric loss angle for the reagent;

f1Hf2n- frequency electromagnetic field, in which tgn= 0,7 tgmn;

f1pf2p- frequency electromagnetic field, in which tgp= 0,7 tgmp.

 

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