SU883358A1 - Method of treating the hole-bottom area of carbonate formation - Google Patents

Description

(54) METHOD FOR TREATING THE RID CARTRONT AREA

PLASTIC

I

The invention relates to the oil producing industry, in particular, to methods of processing the bottomhole formation zone to stimulate the flow of oil from them.

There is a method of treating the bottomhole formation zone by pumping hydrochloric acid 1 into it.

The disadvantage of this method is not sufficiently effective treatment due to equipment corrosion and insufficient penetration of acid into the formation.

There is a method of processing the bottom zone of the carbonate reservoir by pumping into it a solvent, for example acetic acid 2.

However, the method is not sufficiently effective due to the shallow penetration of the solvent into the formation.

The purpose of the invention is to increase the processing efficiency.

The goal is achieved by the fact that according to the method of processing the bottomhole zone of the carbonate formation by pumping in a solvent, a solution of a 1,3-diamino-propanol-2 derivative of the general formula is used as a solvent.

noos-sn2-meNs2-snn sn-n} sn2; -soon sn ,. "Sn,

SOOKa

where 1-5.

The method is carried out as follows.

ten

Derivative 1, 3-diaminopropanol-2 is a product of the synthesis of monochloroacetic acid with 1,3-diaminopropanol

H NEcH-CH-CH -NH,:

15

he. .

where M-1-5; with the subsequent transfer of the product to the salt form according to a known method, in Kofopoif 50% of the hydrogen atoms of the carboxyl groups are replaced with sodium ion. The final product of the synthesis is a white crystalline substance, hygroscopic, well soluble in water.

Into the calculated water suture, 1,3-diamiduid-ball-2-2 is introduced through the water. Next, the reagent is replaced with the aid of an aggregate, or air, then it is pumped into; the well of the prepared aqueous solution of the compound 1 (3-diag 1CHO of fopanol-2 after - pushing it into the reservoir. After reacting the polymer compound with carbonate rock, 1asta and us & sampling of the reacted solution of 1,3-dsm1-propanol-2 derived for DL sro anaaa,

In the proposed method of treating the near-zone of the carbonate shgast, it is expedient to use a 4-10% solution of the polymer compound with a degree of 1-11-1. According to the technical conditions for obtaining this product with a degree of polymerization of more than 5 K8 is provided. In view of this, it is not possible to evaluate the product with rt 5 short-circuit carbonates permeability after their exposure to extracts under conditions close to nlasts.

due to the high material costs, connected with the separation of products of fraction -5 into narrower subfractions, I do not conduct the study of the properties of these products: c, i.e. a product with a wide range of polymerization degree (1-5) is used, which makes it possible to obtain a product that is cheaper than trIon-B (1500 rubles per ton).

Laboratory studies were carried out using a variety of solvents (known and proposed).

Researches are carried out on a unit for the study of reservoir cores. As a liquid, when measuring permeability, after pumping through a core of solvent., Very good kerosene is used, because when using kerosene, the effect on the rock of polar coshyntants is excluded. oil and paraffin wax.

The cores selected for the study were extracted in an alcohol-benzene mixture and placed in a UIPK-IM unit. All compression is the image of the pressure of the rock pressure, and the pressure in the pores is shaped - reservoir pressure. The holding time of the samples under pressure is 7 days. To improve the accuracy of the experiments, the permeability coefficient is determined as the average of four values obtained by three different flow rates, but with a linear filtration mode.

As the concentration of the solvent pumped through the core increases, the penetrability of the core increases as with the use of the known

method, and with the application of the proposed method in comparison with the initial permeability of the core X without solvent pumping).

The proposed carbonate reservoir solvent significantly increases the known technical solution at all concentrations, both for equal dolomite and limestone, and for unequal-grained dolomite and limestone.

If the core permeability increases by 64% when pumping through the core of the Trilon-B in the form of a 10% aqueous solution compared to the INITIAL sample, then the core permeability of the same concentration of 1,3-diaminopropinol-2 increases by 81%. The increase in the permeability of the core by the proposed method is 17% in the case of using an equal-grain. sample with high porosity and 27% in the use of non-biased sample with low porosity.

To estimate the penetration depth of the dissolved into the reservoir, it is very important to know the kinetics of dissolved 1 carbonate reservoir, which is represented by limestone (CaCO3) and dolomotCC – COz, WgCO |.

The amount of reacted carbonate in time is studied as follows.

Samples of carbonate material in the form of samples of 4 g are placed in cylindrical vessels with a solvent in the amount of 1000 ml. As a solvent, Trilon-B and a derivative of 1,3-diaminopropanol-2 in the form of an 8% solution are used.

After 30 MHii, 1-3 hours, samples are removed, dried and weighed. From the difference in weight of the samples, the amount of reacted carbonate material is estimated over time.

The temperature of the solutions in the experiments is maintained within 36-40 ° C, which corresponds to the temperature of the reservoir under in situ conditions. Х.

Claims (1)

1. Amn V.A. and others. Physical and chemical wells. M., Nedra, 1970, p. 41-44 povpie method: w performance squa- (prototype) zh. M .. Nedra, 1970, p. 5-12.