Reagent for removal of oil deposits

IPC classes for russian patent Reagent for removal of oil deposits (RU 2132932):

E21B37/06 - using chemical means for preventing or limiting the deposition of paraffins or like substances (chemical compositions therefor C09K0008520000)

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(57) Abstract:

Reagent for the removal of asphalt, resin and paraffin deposits (ARPD) is intended for use in the oil and gas industries associated with the extraction, transport, refining and storage of crude oil. Prepared from solenodontidae mixture (SDS) - oil fraction obtained in the process of stabilization of oils with a boiling point of 120 - 130^oWith the addition thereto of 4,4-dimethyl-1,3-dioxane. The components of the reagent are products of oil refining and consequently may not negatively affect its properties and processing. Effect: increase the efficiency of the reagent, the expansion of its application. table 2.

The invention is intended for removal of asphalt, resin and paraffin deposits from the wellbore zones and the surface of the column tubing (tubing). It can be used in the oil and gas industry in the extraction, transportation and storage of crude oil and condensates.

Known reagent (1) consisting of a solvent (stable gas condensate) and surfactants (lower alkalemia alcohols or their mixtures), which >Tosporte (C₂...C₆) - 0,8-3,0
Lower alkalemia alcohols (C₁-C₃) - 0,1-0,5
Stable gas condensate - Rest
The main disadvantage of the reagent is the limited application, since the solvent composition contains sulfur compounds, which may cause additional costs for cleaning them produced oil, gas condensate, or gas.

Known reagent (2) to remove the paraffin containing 4,4-dimethyl-1,3 dioxane (DMD) and Supplement thereto 4-ethoxylated ALKYLPHENOLS (OP-4), mixed in ratios, wt%:
OP-4 - 0,005-4,0
DMD - Rest
The main disadvantage of this reagent is its low efficiency and environmental constraints to the use of 4-ethoxylated ALKYLPHENOLS.

The closest technical solution reagent (prototype) is solenodontidae formula (PIF) (3), comprising (in wt.%) from diesel distillate - 40, gasoline - 30 and kerosene 40. Lack of reagent (prototype) is its low efficiency in the removal of sediment, especially in the processing of flooded wells.

The aim of the invention is to increase the efficiency of the reagent on the basis of solenodontidae mixture (SDS), although the dispersing effect in solenodontidae the mixture was added 4,4-dimethyl-1,3 dioxane (DMD) in the following proportions, wt.%:
4,4-dimethyl-1,3-dioxane - 0,05-0,1
Solenodontidae mix - Rest
PIF represents the fraction with the boiling temperatures of 120-130^oC generated by the stabilization of oil in terms of oil and gas production. Depending on the stabilization mode contains in its composition to 27,68-48,63 wt.% dissolved hydrocarbon gases mainly WITH₄-C₅. Its density is 649-815 kg/m³.

Dispersible-cleaning properties of the main component of the reagent, i.e., PIF, due to selective dissolution maloperations part of ASPO, resulting in a dense mass of sediment is loosened, washed and taken off the flow of oil.

To enhance dissolving and dispersing properties of the reagent as an activator of the dissolution process is used 4,4-dimethyl-1,3-dioxane - individual hydrocarbon compound containing in its molecule, the oxygen atoms. It is a colorless liquid with a weak peculiar smell, which is not less than 95% of cyclic acetal and 3-4% of water. DMD has the following physicochemical properties: molecular mass for 116.2; density at 20^oC - 963 kg/m³; dynamic viscosity at 20^oC - 1,36 mPas; temperature C; solubility in water 18 wt.%, oil is not limited to temperatures above 250^oC; the Autoignition temperature of 550^oC. This product made its facilities at the Moscow to be used in technological processes of oil production.

The effectiveness of the proposed reagent was tested on the example of the dissolution and dispersion of the two samples of deposits, formed during the extraction of paraffin (well 16496) and wax (well 20868) oil NGDU "Almetyevneft" the Composition of deposits is given in table. 1 (PL. 1 and 2, see the end of the description).

The reagent for testing samples of deposits on the solubility and dispersibility were prepared by adding in solenodontidae formula (PIF) 4,4-dimethyl-1,3-dioxane (DMD) in an amount of 0.05; 0,01; 1.0 wt.%. To compare the effectiveness of actions. at the same time felt a prototype of reagent (3), prepared according to his description.

The tests were carried out according to the following procedure.

Reagent for treatment of deposits in the amount of 30 cm³poured into a glass tube with a flat bottom and a glass stopper. The cap has a "hostivice", to which the hook hung a strainer with a hinge ASPO weight of about 1, the Strainer is made of stainless steel with cells of size 1,5x1,5 int. At the bottom of the glass-Picatinny the device together with a stir bar was placed in thermostat.

After reaching thermostat set temperature of the experience, for example, 15^oC, included a stirrer and a stopwatch-clock. After the adopted mixing time hanging ASPO together with the strainer removed from the beaker and placed in a fume cupboard, were dried at a constant temperature for 30 minutes and weighed with a precision of 0.01, Then the basket hanging ARPD was again introduced into the glass without changing reagent and procedure between weighings is repeated many times with a gradual increase in the total duration of washing up to 180 minutes

To assess the reliability of the results obtained according to the established procedure, carried out preliminary experiments. If you triple-play the discrepancy between the results of measurements of relative mass ARPD samples did not exceed 5%.

The results of tests of samples of deposits on the solubility and dispersibility when processing offered by the reagent and the prototype are shown in table 2.

From table 2 it follows that the efficiency of the dissolution and dispersion of the samples of deposits offered by the reagent undoubtedly higher than the reagent-prototype. The highest efficiency is observed when SDS is added 0,05-0 is maloperation sediments. The components of the reagent are products of oil processing and therefore do not adversely affect its properties and processing.

The implementation of the method is performed by injection of the reagent in the well annulus and lifting him on the tubing string to the mouth. The injection is carried out in a volume equal to the volume of the annulus and the tubing string with speed, providing a developed turbulent regime of flow of fluid.

Sources of information
1. A. with. USSR N 1162947, CL E 21 In 27/06, 1983.

2. A. with. USSR N 1495353, CL E 21 In 37/06, 1989.

3. A. with. USSR N 1002541, CL E 21 B 37/06, 1983.

Reagent for removal of oil deposits containing solenodontidae mixture, characterized in that the reagent consists of solenodontidae a mixture of 4,4-dimethyl-1,3-dioxane in the following ratios, wt%:
4,4-Dimethyl-1,3-dioxane - 0,05 - 0,10
Solenodontidae mixture Ostalnoe