SU834334A1 - Composition for preventing salt deposition in well - Google Patents

Description

t

The invention relates to oil boiling and can be used to prevent salt deposits in the well and well equipment.

A known composition for preventing deposits in a well and well equipment, including polyethylene polyamino-p-methylene phosphoric acid of general form

CH - CH - N p

sn,

I

,, where n 1-14 l.

However, this composition has not enough high efficiency. In addition, polyethylene polyamino-p-methylenephosphonic acid is not produced in our country, polyacrylamide is a scarce product, and the cost of NTF is currently 7.5 thousand p / t.

The closest to the present invention is a composition comprising a derivative of 1,3 diaminopropenol-2 of the general form

- CH - N - CH - CH -

23

1 he

one

From To

CH,

I

-

 1-5, and water 2 J.

where is P

The disadvantage of the composition lies in the fact that it has low efficiency, and the cost of the derivative of 1.3 diaminopropanol-2 is 2.5 thousand p / t.

The purpose of the invention is to improve the quality of the composition by increasing its protective properties against salt deposits in the well.

The goal is achieved by the fact that the composition additionally contains hydrochloric acid, sodium chloride and 1,3 diaminopropanol of the general form CH - CH - CH, j - NH} n, where n 1-5 following the ratio of components, weight%: Derivative 1 , 3 diaminopropanol-25, 0-20 1.3 diaminopropanol 5.0-7.0 Sol-acid 3.0-30 Sodium chloride 3.0-7.0 Water Up to 100 The combination of these components provides a synergistic effect of the proposed composition in the prevention processes salt deposits in the buccal cavity due to the formation of a polyelectrolyte complex (PEC), which has an increased inhibition With this effect, the formation of PEC can be represented as follows. Unreacted ammonia is protonated with hydrochloric acid according to the scheme HjN -fCH-CH-CH-NHjn + PNH CH-CH-CH-PNHe, in this case the polycation is formed. The modified amine is in solution in the form of a zwitterion. -CH I, CH ,, he I but p - 0 The electrocatic interaction of the polycation and the negatively charged part of the modified amine molecule occurs with the formation of a complex stable PEC.

The composition can be obtained by synthesizing a methylene phosphorylated derivative of 1,3 diamiophenol-2, under certain conditions of methylenephosphorylation of a derivative of 1,3 diaminopropanol-2, ensuring the optimum ratio of components in the reaction solution. The presence of sodium chloride in the proposed composition makes it possible to lower the freezing temperature to -35 ° C, which is / -, 1-C

Э / 0-г Г

-100, Co - CK

where% is the protective effect of inhibition in percent;

С „initial supersaturation of the solution in calcium sulfate, g / l;

CK calcium sulfate concentration in solution without inhibitor additives, g / l; C is the concentration of calcium sulfate in solution with the addition of an inhibitor, g / l. The table shows the data for evaluating the effectiveness of the known and proposed formulations against deposits of mineral salts. 4 is one of the important parameters of the inhibitors manufacturability. Due to the fact that in the USSR 1,3 diaminopropanol-2, a narrow fraction with a degree of polymerization of 1-5 is not produced. and the separation of this product is very complicated and expensive operation, from economic considerations in the synthesis using a wide fraction n 1-5. The use of the proposed composition can be carried out by continuous dosing of the composition into the annulus using a dosing device and setting the composition into the bottomhole zone of a production well with the help of a CA-320 unit. The well is closed for 12-24 hours. During this time, the injected composition is adsorbed on the surface of the pore space of the well bottom zone of the production well and during operation by known methods it is slowly taken in by the reservoir water, which inhibits the well production from deposits of mineral salts. Evaluation of the effectiveness of the proposed and known compositions is carried out according to the following procedure. Calcium sulphate obtained by mixing equivalent amounts of calcium chloride and sodium sulphate is injected into the mixture to prevent the formation of mineral salts. The initial calcium supersaturation is 7.0 g / l. In all experiments, the amount of injected composition is 20.0 mg / L. Only the ratio of components in wt.% Is changed, the solutions are thermostatic at + 40 ° C, the protective effect is determined after 240 hours by the formula

Claims (2)

Claim Composition for preventing salt deposits in the well, including, as a base, a derivative of general minopropanol-2 n ₂ ro _e - sn _g - N £ sn ₂ - СН 1,3 sn but dia40 well, the composition additionally contains hydrochloric acid, sodium chloride and 1,3 general diaminopropanol HjN fcH ₈ - CH - CH ₂ - ΝΗ} η, OH where n = l-5 in the following ratio of components, wt.%: Derivative 1.3 diaminpro * - 5.0-20.0 panola-2 1.3 diaminepropanol 5.0-7.0 Hydrochloric acid 3.0-30.0 Sodium Chloride 3.0-7.0 Water Up to 100 where η = 1-5. and water, about t that, tava due to increase of its protective · properties against salt deposits in VNIIPI Order 4029/57 on Sources of information taken into account during the examination 1. US patent No. 3483925, CL. 166279, published. 1973. soss order to improve quality 2. The certificate of authorship of the USSR on application No. 2687513, class. E 21 B 43/00, 1978 Circulation 627 Subscription Branch of PPP Patent, Uzhhorod, st. Project, 4