RU2001090C1 - Composition for oil recovery and transportation - Google Patents

Abstract

The invention relates to oil production and pipeline transportation of oil and oil products and can be used to treat the bottom zone of the formation, as well as to prevent the formation of asphalgosmoloparaffin deposits and mineral salts on hard surfaces (pipe walls, pumps, downhole equipment, etc.) to reduce hydraulic resistance during the transportation of high viscosity oils and water-oil emulsions through pipes, for downhole demulsification and field treatment of oil. The composition for the extraction and transportation of oil contains a nonionic surfactant (1-10 wt.%) Containing 6-13 hydroxyethyl groups, sodium alkylbenzenesulfonate (5-15 wt.%), Sodium alkanesulfonate (3-30 wt.%), anionic electrolyte modm. 4x10 -5x10 (1 -10 wt%). acid (ost.) and aliphatic alcohol

Description

The invention relates to oil production and pipeline transportation of oil and oil products and can be used to treat the bottomhole formation zone, as well as to prevent the formation of asphalt-resin on hard surfaces (pipe walls, pumps, downhole equipment, etc.) -paraffin of new sediments (paraffin deposits) and mineral salts, to reduce hydraulic resistance during the transportation of high-viscosity oils and water-oil emulsions through pipes, for downhole demulsification and field treatment of oil.

A composition for preventing the formation of paraffin deposits is known, comprising a nonionic surfactant containing 6-13 hydroxyethyl groups and an anionic surfactant containing 8-18 carbon atoms.

The disadvantage of this composition is the limited effectiveness and insufficient duration of surface protection against paraffin.

The closest to the invention in technical essence and the achieved result is a composition for oil production and transport, including a nonionic surfactant containing 6-13 hydroxyethyl groups, sodium alkylbenzenesulfonate, sodium alkanesulfonate and electrolyte. This composition has a wider spectrum of action (preventing the formation of paraffin deposits, reducing hydraulic resistance of viscous oils during their movement in the pore space and through pipes, downhole oil demulsification), but, like the first, it is characterized by uneven coverage by the bottom-hole formation zone . Having a higher washing ability with respect to oil and a low dissolving ability with respect to the carbonate components of productive reservoirs, it quickly and more efficiently flushes oil from large burrow channels, leaving small untreated and does not expand them.

The aim of the invention is to expand the functions of the composition, improve the oil-displacement ability in the reservoir conditions and increase the coverage by the bottom-hole formation zone.

The goal is achieved in that the composition for oil production and transport of oil comprising a nonionic surfactant containing 6-13 hydroxyethyl groups, sodium alkylbenzenesulfonate, sodium alkanesulfonate and the target additive, as a target additive

contains an anionic polyelectrolyte with a molecular weight of 4 104 5 10b and additionally acid and aliphatic alcohol in the following ratio, May%:

Non-ionic surfactant containing 6-13 hydroxyethyl groups 1-10 Sodium alkylbenzenesulfonate 5-15 Sodium alkanesulfonate 3-30 Aliphatic alcohol 0.1-20 Anionic polyelectrolyte 5 lit. mol mol. 4-U4 -5-U6 1-10 Acid The rest The composition may also contain complex in an amount of 0.5-1.0%.

As a nonionic surfactant, the composition contains monoalkyl ethers of poly (ethylene glycol) based on fatty alcohols of the C10-C13 fraction (syntanol DT-7, TU 6-14-1037-79) or the C10-C20 fraction (Syntanol DS-10 , TU 6-14-5 577777), mono- and dialkyl ethers of polyethylene glycol (wetting agent DB, MRTU 6-02-530-80), polyethylene glycol ethers of monoethanolamides of fatty acids of fraction C10-C16 (Syntamide 5, Syntamide 10, TU 0 6-02-640-80). ethoxylated alkyl ethers based on propylene trimers (Neonol 9-12. Neonol 9-10, TU 38-1036-25-87). Of the sodium alkylbeneolsulfonates, sulfonol with 10-18 carbon atoms of the 5th kind is used (GU 6-01-1043-79 or TU 6-01-01-1001-73 or TU 38-9-35-69).

From sodium alkanesulfonates, a sulfonate containing 12-18 carbon atoms (TU 6-01-35-79) or Volgonate 0 containing 11-17 carbon atoms (OST 6-01-32-77) are used.

As aliphatic alcohols of the C1-SZ group, technical ethyl alcohol (GOST 17299-78), 5 propyl alcohol (GOST 69-95-77) or isopropyl alcohol (TU 6-09-402-75) are used. You can use a mixture of these alcohols with ethylene glycol.

As complexones used

0 2-hydroxy-1.3-diaminepropane tetrazmethylenephosphonic acid (DFT-1, TU 09-4915-80) or

its sodium salt (DPF-1H, TU 6-09-20-3680) oxyethylene diphosphonic acid

(OEDP) or nitrilotrimethylenephosphonopal

5 acid (NTP).

The anionic polyelectrolyte is sodium carboxymethyl cellulose with an esterification degree of 0.4 to 1.2, sodium polyacrylate or sodium polymethacrylate.

Hydrochloric, supfamic acid is used as acid. yfccvi acid or a mixture thereof.

When introduced into the oil, the composition is dissolved in fresh, sea or formation water to a content of 0.05-100%.

The effectiveness of the composition was determined in laboratory and field conditions according to the following indicators:

decrease in hydraulic resistance of high viscous oils during their movement through pipes (increase in useful productivity of the pipeline);

hydrodynamic stability of the annular flow;

the effectiveness of preventing the formation of paraffin;

stabilizing ability (residual oil content in solution);

oil displacement ability and oil displacement coefficient

Examples. The starting components, taken in a specific weight ratio, are mixed until a uniform, low mass is formed.

Example 1. A mixture of 1 g of nonionic surfactant (Syntanol DT-7), 0.1 g of ethyl alcohol, 5 g of sodium alkylbenzenesulfonate (Sulfonol) is prepared. When the mixture is homogeneous, with constant mechanical stirring, 1 g of sodium salt of carboxymethyl cellulose, previously dissolved in 89.9 g of hydrochloric acid, and 3 g of sodium alkanesulfonate (Volgonate) are introduced. The resulting 100 g of the composition was used according to accepted technology.

EXAMPLE 2 A mixture of 5.5 g of nonionic surfactant (Syntanol DT-7), 10 g of ethyl alcohol, 10 g of sodium alkylbenzenesulfonate (Sulfonol) and 16.5 g of sodium alkanesulfonate (Volgonate) is prepared. After achieving uniformity of the mixture with constant mechanical stirring, 5.5 g of sodium salt of carboxymethyl cellulose, previously dissolved in 52.5 g of hydrochloric acid, are introduced.

Example 3. A mixture of 10 g of nonionic surfactant (Syntanol DT-7) was prepared. 20 g of ethyl alcohol, 15 g of sodium alkylbenzenesulfonate (Sulfonol) and 30 g of sodium alkanesulfonate (Volgonate). When the mixture is homogeneous, with constant mechanical stirring, 10 g of sodium salt of carboxymethyl cellulose, previously dissolved in 15 g of hydrochloric acid, are introduced.

Examples 4-14 are prepared in a similar manner. The ratio of components is shown in table 1.

The oil displacement coefficient and oil displacement ability were determined on a porous medium model using the SibNIPI express method. Compositions with a fixed daplrnia were passed through a thermostatically controlled bulk core, preliminarily saturated with water and oil with a known viscosity and density. The oil displacement coefficient Kv was calculated by the formula

K „V ,, 2 / Vh, i.

where Vn2 is the volume of oil displaced by the test composition from the core, ml,

VH1 - oil volume taken for preliminary saturation of the core, ml.

Oil-displacing ability of the composition of the NSA was calculated by the formula

NVS VH2 / Vnop,

where Vnop is a predetermined pore volume of the core, ml.

Hydraulic resistance at

The movement through the pipes of high viscous oils was determined using an open-type tubular rheometer with two paired parallel tubes. Test Composition

injected into one of the tubes directly into the volume of the oil being pushed. The oil flow rate was determined at an equal pressure drop using liquid flow meters.

The hydrodynamic stability of the annular peripheral flow of the test composition was determined on the same instrument by the length of the relaxation and aftereffect periods determined from the moment the reagent was stopped being introduced into the tube.

The effectiveness of surface protection from sediment deposits was determined by the cold cylinder method and was calculated by the formula

3 (M0-Mi) 100% / Mo,

where Mo is the mass of paraffin deposits deposited on the walls of the cold cylinder from the control sample (without introducing the composition into the oil),

Mi is the mass of paraffin. deposited with on the walls of the cold cylinder in the presence of the test composition.

The stabilizing ability of the composition

was characterized by a residual oil content in its aqueous 0.1% solution after 100 g of oil was added to 1 liter of this solution, dosed mechanical dispersion and a seven-day sediment. The oil content in the solution was determined by infrared spectroscopy after removal of the floated oil from the surface of the solution.

As can be seen from the data in table 2, the additional introduction to the composition of anipny polyelectrolyte mol 4-10 - 5-10 and acid with a certain ratio of components provides, in contrast to the prototype, an improvement in reservoir properties and an increase in coverage by the bottom-hole formation zone, and also increases the effectiveness of surface protection against paraffin, gives a more significant and lasting in comparison with the prototype, a decrease in hydraulic resistance during the movement of high viscosity oil through pipes. The low stabilizing ability of the composition allows it to be used repeatedly, which helps to prevent environmental pollution during technological operations to intensify the operation of production and injection wells and pipelines.

(56) Copyright certificate of the USSR No. 767451, cl. F 17 D 1/16, 1978.

USSR copyright certificate GF 1063820.cl C 09 K 3/00, 1982 (prototype)

Table 1

table 2

Claims (2)

1. COMPOSITION FOR OIL PRODUCTION AND TRANSPORT comprising a nonionic surfactant based on alkyl esters containing 6-13 hydroxyethyl groups, sodium alkyl benzene sulfonate, sodium alkanesulfonate and a target additive, characterized in that the composition further comprises an acid and an aliphatic alcohol, and as the target additive an anionic polyelectrolyte mol. m, 4 104 - 5 106 in the following ratio of components, wt.%: Based nonionic surfactant alkyl esters containing 6 to 13 hydroxyethyl groups Sodium alkylbenzenesulfonate Sodium alkanesulfonate Aliphatic alcohol 0 Anionic polyelectrrlite mol. m. 4 104-5 10 Acid 2. The composition according to claim 1, characterized in that it further comprises a phosphonic acid complex in an amount of 0.5-1.0% of the composition. 5-15 3-30 0.1 -20 1-10 Else