The method of thermochemical effects on the bottomhole formation zone

 

(57) Abstract:

The invention relates to the oil and gas industry, in particular to methods of intensification of the flow of hydrocarbon fluids in wells, reservoirs which kolmat wax and paraffin deposits ARPD. The technical result is to increase the efficiency of cleaning of paraffin. In the method of thermochemical effects on the bottomhole formation zone, kolmat wax and paraffin deposits, which consistently pumped at the well bottom two groups, representing the fuel-oxidizer system, in which the first composition contains ammonium nitrate and water, and the second salt of nitrous acid - atomistically sodium and water, the first composition further comprises urea and the catalyst is Nickel nitrate is in the following ratio of components, %: ammonium nitrate 15-65, urea 2-18, Nickel nitrate of 0.0005 to 0.05, water the rest, and the second part contains the specified salt 15-65%, the second composition is injected into the volume, 1.5-4 times smaller than the first. And the second composition additionally contains 0.0005-0.005% corrosion inhibitor - aldehydebase. 1 C.p. f-crystals.

Spa bottomhole formation zone (PPP) oil, gas and gas condensate wells to eliminate clogging of the pore space wax and paraffin deposits (ARPD).

There is a method of high-energy thermochemical impact on the PPP [1], which consists in the sequential delivery to the borehole bottom of granulated magnesium metal and hydrochloric acid. This system is quite high-tech. Implemented with the equipment used on the job to repair the wells. Positive aspects of this technology are:

- no heat loss in the wellbore, which are characteristic of the methods based on injection of fluids from the surface;

- unlimited depth effects;

- the ability to control the total amount of heat using the volumes and concentrations of the reacting substances.

The disadvantage of this technology is the need for pre-fracturing and the use of inert carriers or special containers for the delivery of granular magnesium metal at the bottom of a well.

The closest analogue is the way thermochemical effects on the bottomhole formation zone, which were a fuel-oxidizer system, in which the first composition contains ammonium nitrate and water, and the second atomistically sodium and water [2].

How termokhimicheskogo impact on the reservoir [1] and [2] do not allow to reach the high temperatures required for the conversion of clogging deposits in the lighter hydrocarbons, and especially their burnout. In addition, the method of [2] cannot provide the high temperature and pressure.

The aim of the proposed method thermochemical impact on the PPP is the creation of a two-component system (both components are liquids or suspensions depending on the processing requirements of the PPP), sequential injection which hole leads to the interaction of the components directly in the perforated interval with the evolution of considerable heat and a large volume of the reaction gases of the reaction products, ensuring the efficiency of the impact on the PPP.

This objective is achieved in that in the method of thermochemical effects on the bottomhole formation zone, kolmat ASPO at which sequentially pumped at the well bottom two groups, representing the fuel-oxidizer system, in which the first SOS is the first composition further comprises urea and a catalyst nitrate Nickel in the following ratio of components, %: ammonium nitrate 15-65, urea 2-18, Nickel nitrate of 0.0005 to 0.05, water the rest, and the second part contains the specified salt 15-65%, the second composition is injected into the volume, 1.5-4 times smaller than the first. The second composition may contain addition of 0.0005-0.005% corrosion inhibitor - aldehydebase.

Depending on the relationship of these components is governed by the speed and direction of a chemical reaction between the first and second compositions, thereby achieving temperatures up to 700 - 9000C and pressure up to 0.8 MPa. This creates the conditions for the elimination of deposits of any density. High pressure reaction gas provides additional fracturing and permeability of the productive formation and the recovery rate of the well.

The method is as follows. At the bottom of a well, kolmat ASPO, is injected first solution containing, wt.%: ammonium nitrate 15, urea 10, nitrate Nickel 0,005, water, rest, a second composition containing atomistically sodium 35 wt.% and water the rest. The first composition is injected in an amount that allows you to fill the sump well and half of the perforated interval. Density SOS compositions allows to displace the water (if available) from the sump and the perforated interval of the well.

Sources of information

1. U.S. patent No. 4615391, MKI3E 21 IN 21.02.1986.

2. U.S. patent No. 4482016, E 21 In 43/27, 17.11.1983, 10 S.

1. The method of thermochemical effects on the bottomhole formation zone, kolmat wax and paraffin deposits, which consistently pumped at the well bottom two groups, representing the fuel-oxidizer system, in which the first composition contains ammonium nitrate and water, and the second salt of nitrous acid - atomistically sodium and water, wherein the first composition further comprises urea and the catalyst is Nickel nitrate in the following ratio of components, %: ammonium nitrate 15-65, urea 2-18, Nickel nitrate of 0.0005 to 0.05, the water - else, while the second part contains the specified salt 15-65%, the second composition is injected in a volume of 1.5-4 times smaller than the first.

2. The method according to p. 1, characterized in that the second composition contains an addition of 0.0005-0.005% corrosion inhibitor - aldehydebase.

 

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1 dwg, 5 tbl, 5 ex

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