SU1539203A1 - Composition for preventing asphalt, resin and paraffin deposits in oilfield equipment - Google Patents

Abstract

The invention relates to oil production and can be used to protect oilfield equipment. The purpose of the invention is to increase efficiency while ensuring deep dehydration of the oil produced and transported and reduction of the corrosive effect. The composition contains by-products of the production of 2-ethyl-hexanol and butyl alcohols by the method of oxosynthesis 20 - 30% wt. and diproxamine 157 - 65M - product of sequential addition of 4 wt.h. propylene oxide, 28 wt.h. ethylene oxide and 60 wt.h. propylene oxide to parts by weight ethylenediamine - the rest. 5 tab.

Description

The invention relates to oil production and can be used to protect oilfield equipment, land and transport communications from asphalt-tar refining deposits (ARP), as well as for de-emulsifying - dewatering produced watered oil.

The aim of the invention is to increase the effectiveness of preventing ARPD while at the same time ensuring deep dehydration of the oil produced and transported, reducing the corrosive effect.

The composition is prepared as follows. In a flask with a propeller-type stirrer, diproxamine 157-65M and the byproducts of the production of 2-ethylhexanol and butyl alcohols by the oxosynthesis method are loaded and mixed in

for 5 minutes at room temperature to 5 until a homogeneous mass is obtained.

The by-products of the production of 2-ethylhexanol and butyl alcohols by the method of oxosynthesis (hereinafter referred to as further by-products) are / petrochemical production wastes, are a mixture of the dimeric fraction of the bottoms of distillation of butyl alcohols and high-boiling products of the rectification of 2-ethylhexanol component composition, wt.%: Isomasl aldehyde

n-aldehyde

Isobutyl alcohol n-butyl alcohol

0.97-1.0

1.15-1.5 2.5 -3.71 9.47-10.0 0.19-0.5

N-butylformate 0.21-0.55

High boiling point product with temperature

boiling above + 200 ° C Else.

The by-products are brown liquid with a density of 880-884 kg / m3 and a kinematic viscosity of 8 mm - / s at 20 C.

Diproxamine 157-65M is a serial product of 4 wt.h. propylene oxide, 28 ma.ch. ethylene oxide and 60 ma.h. propylene oxide to 1 ma.h. ethylene diamine; according to TU 38-40-1292-80 - a yellow liquid with a density of 944-946 kg / m3 and a kinematic viscosity of 50 mm2 / s at 20 ° C.

Example 1. To 78 g of diproxamine 157-65M add 22 g of side products: products and mix for 5 minutes until smooth.

Example2. 30 g of by-products are added to 70 g of diproxamine 157-65M and stirred for 5 minutes until a homogeneous mass is obtained.

Analogously to examples 1 and 2, the compositions according to examples 3-18 are prepared.

During laboratory tests, the properties of the proposed ARPD prevention agent for various types of oils, as well as its demulsifying properties, were determined.

Tests to determine the effectiveness of prevention of AFS by the proposed composition were carried out on oilfield sediments and oil from the Kokuisky (medium type), Konstantinovsky (heavy type) and Yurchuksky (light type) fields, data on the composition of which are given in Table. one.

During tests, the formation water of these deposits was used. Physico-chemical characteristics of formation waters are presented in table. 2

The effectiveness of prevention of paraffin wax was evaluated by the following indicators: the degree of washing of the oil film with this composition and the average dispersion of paraffin wax in the medium of composition.

When testing for washing a film of oil, the percentage of washing of a film of oil with reservoir water from the wall of a glass test tube is determined by time (for 100%, half of the entire surface of the test tube is considered ;.

Adopted then: excellent - 70-90% in 30 s; washing off good - 70-90% for 60 si washing off satisfactory 70

about

five

P

five

90% for 180 s; washing off bad - more than 3 min. In this case, field testing of the reagent is not recommended.

In the dispersion test, the size of the obtained paraffin particles in the formation water is determined by adding the test reagent. The result is considered to be excellent with a paraffin particle size of 0.1-3 mm (1,00%); good - 0.1–5 mm (100%) satisfactory 0.1–7 mm (100%); above 7 mm is unsatisfactory, and a reagent that gives such a dispersion of sediments is not recommended for pilot testing.

Determining the degree of washing of the oil film was carried out as follows. 20 ml of the test oil was poured into the glass test tubes and held for 30 minutes to create an oil film on the surface of the test tubes. Then the oil from the tube was poured and poured into it the reservoir water of the same field as the oil, in an amount of 10 ml and held for 1 minute. After that, 10 ml of oil, previously well mixed with the proposed composition, were applied to the tubes (the content of the composition in oil in all experiments was 200 g / t). The tubes were capped and pumped. After a certain time, the surface of the tube that was freed from the oil film (in percent) was visually determined. Similarly, a control experiment was carried out without making the composition.

The effectiveness of the composition on washing the oil film was evaluated by the difference in the magnitudes of the surface area freed from the oil film in this and control experiments.

Tests to determine the size of the dispersion particles in the medium of the proposed composition of sediment deposits selected from producing paraffin-resin deposits of oil wells were carried out in the following sequence. Using a graduated cylinder, 50 ml of produced water were taken and poured into a conical flask, to which the composition was then introduced. Next, the deposition of ARPD weighing 2.5 g was placed in the same flask. The contents were heated on a plate until the deposits were completely melted. The flask was then cooled under running tap water, shaking it in a circular motion. In this visual

51

but the dispersion of asphal tosmoloparaffin deposits was recorded.

To obtain comparative data, the composition, by-products and diproxamine 157-65M, also known by the prototype, were also tested.

Data on the effectiveness of prevention of paraffin proposed and known compounds are given in table. 3,

As can be seen from the table. 3, the proposed composition (tests 8-16) has, compared with the known compositions, a higher effect of preventing ARPD, namely: washing the oil film with this composition is 85-95% / min; The average dispersion of ARPD particles upon addition of the proposed honeycomb is 2-3 mm.

Such high properties of the proposed ARPD prevention composition appear for any type of oil: for light (tests 11-13J, medium (tests) and heavy (experiments 14-16)

A change to a higher or lower side of the ingredients (experiments 1-7, 17, 18) does not allow to achieve the goal. For example, a composition containing 35% by weight of by-products and diproxamine 157-65M — the rest cannot be recommended, since washing the oil film with formation water is only 65% in 3 minutes (experiment 7). The composition containing 10% by weight .% side

The 30th composition, which has a high effect on the prevention of ARPD, at the same time is characterized by high demulsifying properties allowing to produce deep

products and diproxamine 157-65M - dehydration of watered oil is detrimental, also has poor washing off - a short period of time (60% over

3 min.

(experience 18). In addition, the size of the dispersion of paraffin particles in the medium of this composition is increased by 2 times. Thus, these formulations are ineffective.

The demulsifying ability of the compositions was evaluated on artificial emulsions prepared immediately prior to testing from anhydrous oil and formation water of the same field, where the effectiveness of preventing formation of paraffin wax was tested by the described method. Water-water emulsion watering was set in such a way as to ensure a stable emulsion (usually 10–30% depending on the type of oil). The tests were carried out in a mode imitating under laboratory conditions the process of transporting oil through pipelines by shaking Wagner.

40

45

50

55

1 and 2), while the composition according to the prototype practically does not provide for the demulsification of such oil (experiments 5 and 6). The ingredients included in the proposed composition, each separately, also do not have high demulsifying properties (experiments 3 and

The proposed composition should be introduced into the oil from 50 to 200 g / t of oil. Application of the composition in quantities less than 50 g / t reduces the demulsifying effect and reduces its effect as an inhibitor of asphalt-resin-waxes deposits. The introduction of a composition of more than 200 g / t increases the effect as an ARPA inhibitor, but may negatively affect the process of de-emulsification of the water-laden oil, causing re-redispersion and stabilization of the oil-water emulsion.

Under laboratory conditions, the effects of the proposed composition are also determined.

ten

A 30% artificial water-oil emulsion was prepared on anhydrous oil from the Kokuiskr field and produced water from the same field. To prepare a 1-l emulsion, 700 ml of oil and 300 ml of water were taken, stirred in a Voronezh-2 mixer at a speed of 600 rpm. The freshly prepared emulsion was subjected to aging for 1 hour. Then the emulsion was poured into settling tanks with a graduated trap, 100 ml each, then injected into these settling tanks.

15 patched composition. The reagent was injected into

oil emulsion in specified quantities. The settler with the emulsion and the composition was placed in a Wagner agitator and stirred for 2 hours. Then the settler was placed in a thermostat and kept for 4 hours at + 40 ° C. After 0.5; one; 2; For 3 and 4 hours, the volumes of released water were recorded. Residual water content was determined according to GOST 2477-65.

Data on the demulsifying properties of the proposed, well-known, by prototype compositions, byproducts and depoxamine 157-65M are given in table 4. As can be seen from the table. 4, the proposed composition, which is highly effective in preventing ARPD, at the same time is characterized by high demulsifying properties i which allow to produce deep

0

five

5 dewatering of watered oil in a short period of time (experiments

dewatering of flooded oil in a short period of time (experiments

1 and 2), while the composition of the prototype practically does not provide the demulsification of such oil (experiments 5 and 6). The ingredients included in the proposed composition, each separately -; These, too, do not possess high de-mulgilating properties (experiments 3 and 4).

The proposed composition should be introduced into the oil from 50 to 200 g / ton of oil. The use of the composition in quantities of less than 50 g / t reduces the demulsifying effect and reduces its effect as an inhibitor of asphaltosmoloparaffin deposits. The introduction of a composition of more than 200 g / t increases the effect as an ARPD inhibitor, but may negatively affect the process of de-emulsification of flooded oil, causing re-redispersion and stabilization of the oil-water emulsion.

Under laboratory conditions, the effect of the proposed composition on the corrosion of oilfield equipment was also determined. The studies were carried out as follows. Four samples of 08KP grade steel, 5 mm in size, preliminarily cleaned from rust, kept in a desiccator for 1 hour and i (weighted. The samples were fixed in special inert material holders. The samples were placed in a glass cell. - the test medium is filled in (30% Kokuysk emulsion and Kokuysk wastewater). The cells were installed in the Wheel installation, the velocity of the medium was set at 0.4 m / s. The experiments were carried out at + 20 ° C. Determination of the corrosion rate in the original media , as well as its change when adding to it the proposed composition at various dosages, the results of two experiments were averaged: after 6 hours, the samples were removed from the cells, washed alternately with gasoline, detergent solution, running water, then distilled, dried, kept in a desiccator for 1 h, and weighed. was calculated by the weight loss of the sample before testing and after testing, and the degree of protection against corrosion (Z) was calculated by changing the corrosion rate in the control experiment without composition and in the experiment with the application of the composition, referred to the corrosion rate in the control experiment:

z -Ј- ° - JLl-xioo,

K. o

where K0, K1 are the corrosion rates of the sample in the flow of corrosive medium in the control and with the suggested composition of the sample.

Data on the degree of | corrosion protection offered and known for the prototype of the composition are given in table. five.

As can be seen from the table. 5, the proposed composition compared to the known does not cause corrosion, has a protective effect of 37-41%.

The proposed composition has you 5

low efficacy to prevent ARPD (washing the oil film with this composition 85-90% in 30 s, the average dispersion of particles in the medium of this composition is 2-3 mm, while the known composition is able to wash only 30% of the oil film in 30 minutes and the average dispersion of ARPD particles in a medium of known composition is 7 mm.

about 5 0

five

0

0

At the same time, the proposed composition, together with high effectiveness in preventing ARPD, has a higher ability to demulsify (provides deep complete dehydration of flooded oil) compared with the known composition, which practically does not play the role of demulsifier, since the residual water content is 26 , 6-28,8%.

Thus, the proposed composition has a multifunctional effect: it protects equipment from ARPD deposits, prevents the formation of persistent water-oil emulsions, carries out traveling demulsification, promotes deep and almost complete dewatering of watered oil, does not cause equipment corrosion. All this lengthens the life of the oilfield equipment, reduces the consumption of reagents, improves the quality of commercial oil, reduces its cost, reduces downtime of wells. In addition, the formulation is prepared using petrochemical production by-products requiring disposal.

When using the proposed composition, the economic effect is obtained by reducing operating costs as a result of reducing the number of underground repairs caused by the paraffinization of equipment, reducing the number of preventive heat treatments for removing ASPO from producing wells, discharge lines and oil pipelines, shortage of oil due to the stagnation of oil production wells and increase their operating factors, the consumption of demulsifiers, the implementation of corrosion protection of oil field equipment, izheni costs and limited range of chemicals, thus reducing transportation FLOW - rows.

Claims (1)

Invention Formula A composition for preventing asphalt-tar-paraffin deposits in oil-field equipment, including products of production of 2-ethylhexanol, characterized in that, in order to increase the effectiveness of preventing sediments while ensuring deep dehydration 9153920310 extracted and transported oil, 60 mah. propylene oxide to Gmas.ch. a decrease in the corrosive effect, ethylenediamine at the following ratio of the quality of products for the production of 2-ethylhexanol, the composition contains by-products of the production of 2-ethylhexanol and butyl alcohols by the method of okosintea and additionally droxamine 157-65M - a product of sequential addition of 4 ma.ch. oxides by the method of oxosynthesis of 20-30 propylene, 28 wt.h. ethylene oxide and NII components, wt.%: By-products of production of 2-ethylhexanol and butyl alcohols by the method of oxosynthesis Diproxamine 157-65M Else. Table 1 method of oxosynthesis NII components, wt.%: By-products of production of 2-ethylhexanol and butyl alcohols by the method of oxosynthesis method of oxosynthesis 20-30 Diproxamine 157-65M Else. Table 1 Waste water from Konstchtinovskaya THU. Table eleven 1539203 In experiments 1-10, 21, oil from the Kokuisky field (medium type of oil) was used; in experiments 11, 12, 13, 22 - the Yurchuksky field (light type of oil) 1. in experiments 14-20, 23 - of the Konstantinovskoye field (heavy type of oil). 12 Table3 For the proposed composition 1.1 2 30 20 20 100 VAT residue of production of 2- ethylhexanol In the experiments, anhydrous oil and reservoir water from the Kokuyskoye field (medium type of oil) were used, in experiments 1.1, 2.1, 6.1 - anhydrous oil and reservoir water of the Konstantinovsky field (heavy type of oil). For the proposed composition Table Table3  5153920316 Continuation of table.5 Jjtl Prototype Kokuysk 30% is artificial  In the study took the following proposed composition, wt.%: By-products 20, diproxamine 157-65M the rest.  In the study took sledguo.tsy composition of the prototype, wt.%: VAT residue production of 2-ethylhexanol 10, gasoline the rest.