RU2568201C1 - Method for obtaining reagent for drilling - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: in a method for obtaining a reagent for drilling there mixed is a starch-containing component with sapropel and with NaOH and/or KOH alkali in the ratio of 10:(0.2-1):1 in terms of a dry substance with further single or multiple extrusion treatment of the mixture at 100-200°C, screw rotation frequency of 50-100 rpm, draw die diameter of 1-6 mm with further crushing and sieving, or a reagent is obtained as a result of mixing of extrudates of sapropel and the starch-containing component, which are produced under the above said different extrusion process conditions, near each other or with dextrins (amylodextrin and/or erythrodextrin, and/or achrodextrin, and/or maltodextrin); with that, humidity of the final reagent shall not exceed 30%, and pH of 10% water solution of the reagent shall not exceed 12 units.

EFFECT: high consumer characteristics of a drilling reagent; high-effective and economic method for obtaining the drilling reagent.

3 tbl, 5 ex, 4 dwg

Description

The present invention relates to exploration, the oil and gas industry (drilling of oil and gas wells) and can be used in the manufacture of a reagent for drilling fluids (including clayless), as well as other process fluids in various industries that use starch-containing products.

The invention allows to obtain a starch-containing modified reagent for drilling with high consumer characteristics and to develop a highly efficient, economical method for producing a starch-containing modified reagent for drilling.

Known reagent stabilizer of drilling fluids [A.S. USSR No. 1838365, C09K 7/02, 1993], which is obtained by treating the waste of grain origin with an alkaline additive in an aqueous medium. As a waste of grain origin use the waste of flour milling from the stage of grain cleaning or tearing, or enrichment, or grinding, or grinding processes and / or their arbitrary mixture in an amount of from 6 to 28 wt. % reagent. Alkaline additive is used in an amount of 0.6-6.8. The reagent may further contain a tannin-containing additive in an amount of from 0.01 to 7.4 wt. % reagent and / or carboxylic acid (or its salt) - 0.03-9.60 wt. % reagent, and / or dispersion additive - 4-36 wt. % reagent. The reagent is introduced into the drilling fluids in an amount of 1.5 wt. % drilling fluid.

A disadvantage of the known reagent is that preliminary clustering is required, which complicates the technology for its preparation.

The closest in technical solution to the proposed invention is a composition for the preparation of starch-containing reagent for drilling fluids [A. from. USSR No. 1482929, С09K 7/00, 1989] - prototype, including (in wt.%): Starch-containing component - grain base 70-95, agrimus - waste production of furfural from corn cobs 5-30.

Disadvantages - multicomponent, the complexity of obtaining and low efficiency of the reagent.

Thus, the problem to which this invention is directed is to develop a highly efficient and economical method for producing a starch-containing modified drilling reagent with good consumer characteristics (organoleptic and physico-chemical properties).

This is achieved in that a method for producing a drilling reagent, comprising treating starch-containing raw materials, characterized in that the reagent is obtained by mixing the starch-containing component with sapropel and alkali (NaOH and / or KOH) in a ratio of 10: (0.2-1) : 1 in terms of dry matter, followed by single or multiple extrusion processing of the mixture at 100-200 ° C, screw speed 50-100 rpm, die diameter 1-6 mm, followed by crushing and sieving or the reagent is obtained as a result mixing extrudates sa ropeli and starch component developed at various extrusion process modes with each other or with dextrins (amylodextrin and / or eritrodekstrinom and / or ahroodekstrinom and / or maltodextrin); the humidity of the final reagent should not exceed 30%, and the pH of a 10% aqueous solution of the reagent should not exceed 12 units.

The method is implemented as follows.

As raw materials used:

1. Starch-containing component:

- potato starch GOST 7699-78 (humidity 17-20%);

- corn starch GOST 7697-82 (humidity 13-16%);

- tapioca starch according to the technical regulatory legal act (TYPE);

- wheat starch according to TNLA;

- rye starch according to TNLA;

- barley starch according to TNLA;

- triticale starch according to TNLA;

- rice starch according to TNLA;

- amaranth starch according to TNLA;

- Sorghum starch according to TNLA;

- chickpea starch according to TNLA;

- pea starch according to TNLA;

- bean starch according to TNLA;

- Chumiz starch according to TNLA;

- starch mixtures of different ratios according to TNLA;

- potato flour according to TNLA;

- corn flour according to TNLA;

- tapioca flour according to TNLA;

- wheat flour according to TNLA;

- rye flour according to TNLA;

- barley flour according to TNLA;

- triticale flour according to TNLA;

- rice flour according to TNLA;

- amaranth flour according to TNLA;

- sorghum flour according to TNLA;

- chickpea flour according to TNLA;

- pea flour according to TNLA;

- bean flour according to TNLA;

- Chumiz flour according to TNLA;

- flour mixtures of various proportions according to TNLA;

- potato pulp according to TNLA;

- corn pulp according to TNLA;

- a mixture of potato and corn pulp according to TNLA;

- other types of starch-containing raw materials according to TNLA;

- various types of dextrins (amylodextrin and / or erythrodextrin, and / or achrodextrin, and / or maltodextrin) according to TNLA;

2. Peat soil (sapropel) according to TNLA is presented in FIG. 1 and 2 ::

- Sapropel deposit “Lake Pribylovichi”: Lelchitsky district, Gomel region;

- sapropel deposit "Lake Wild": Petrikovsky district, Gomel region;

- sapropel deposit “Lake Buevskoye”: Liozno district, Vitebsk region;

- “Black Lake” sapropel deposit: Braslavsky district, Vitebsk region;

- sapropel deposit “Lake Valverovo”: Postavy district, Vitebsk region;

- Korytino sapropel deposit: Baranavichy district, Brest region;

- Kama sapropel deposit (Russian Federation);

3. Alkali according to TNLA (tables. 1 and 2):

- caustic soda (NaOH) according to GOST 2263-79 or according to GOST 4328-77 or according to TU 2132-374-05763458-2005;

- potassium hydroxide (KOH) according to GOST 24363-80.

As materials used:

- steel wire mesh fabric for the flour milling industry No. 067 according to TNLA;

- four-layer paper bags according to TNLA;

- a soft container of disposable or reusable use with a polyethylene liner according to TNLA;

- other types of containers, packaging and packaging materials according to TNLA;

- threads according to TNLA.

The hardware-technological scheme for the production of starch-modified modified drilling reagent shown in FIG. 3, includes a service platform 1, mixer 2, screw conveyor 3, extrusion installation 4, inclined conveyor 5, hopper 6, conveyor or pneumatic conveyor 7, grinder with sifter and remote conveyor 8, packing machine 9, and figure 4 shows an unfinished drilling reagent BelNIPIneft, RUE “PO“ Belarusneft ”.

The technological process of production of the reagent includes the following stages: preparation of raw materials:

- sifting;

- mixing;

- magnetic cleaning (separation) - carried out if necessary;

- feed into the storage (loading) hopper;

- physical modification (extrusion);

- grinding;

- sifting;

- weighing;

- packaging;

- transportation and storage.

The raw materials are checked for conformity with TNLA, the components are sieved and the raw materials are loaded into the storage (loading) hopper, and then into the loading funnel of the extruder.

Magnetic cleaning (separation) is carried out, if necessary, with permanent magnets, the layer thickness of 6-8 mm, a speed of not more than 0.5 m / s.

Extrusion can be carried out on a twin-screw extruder RZ-KED-88 or on STAK extruders from April, or any other similar equipment with the following technological parameters:

defining physico-chemical and technological indicators:

- operating temperature 100-200 ° C (most preferred temperature 110-150 ° C);

- the frequency of rotation of the working screws is 50-100 min ^-1 (rpm);

- diameter of the used die - 1-6 mm;

- the extrusion process can be carried out with additional water supply or without additional water supply.

- the extrusion process can be carried out with an additional supply of chemical agents or without an additional supply of chemical agents;

determining extrusion performance:

- the frequency of rotation of the cutting device 80-85 min ^-1 (rpm);

- rotational speed of the metering screw 90-95 min ^-1 (rpm).

Physico-chemical and technological parameters of the finished product - the extrudate are determined by the working temperature of the extrusion, the rotational speed of the working screws and the diameter of the die used, as well as the presence or absence of water during extrusion.

In this case, the rotational speed of the metering screw and the rotational speed of the cutting device characterize the productivity of the technological equipment (extruder) and do not affect the physicochemical and technological characteristics of the finished product (extrudate).

The extrudate obtained under various technological conditions (temperature, screw speed, die diameter) is mixed.

If necessary, you can add 1-5 wt. % dextrins (amylodextrin and / or erythrodextrin, and / or achrodextrin, and / or maltodextrin). So, in accordance with the molecular weight and properties, the following types of dextrins (split amylopectin) are distinguished:

колеблется от +190° до +196°, восстановительная способность находится в пределах 0,6-2,0%;1) amylodextrin - stained with a solution of iodine in violet-blue color, is a white powder, soluble in 25% alcohol solution, precipitated with a 40% alcohol solution, specific rotation of the plane of polarization

ranges from + 190 ° to + 196 °, restorative ability is in the range of 0.6-2.0%;

+194°, восстановительная способность составляет 1-3%;2) erythrodextrin - stained with iodine in red-brown color, dissolved in a 55% alcohol solution, precipitated with a 65% alcohol solution, it crystallizes from warm alcohol solutions in the form of spherical crystals, specific rotation

+ 194 °, the recovery ability is 1-3%;

+192°, восстановительная способность равна 10%;3) achroodextrin - not stained with iodine, soluble in a 70% alcohol solution, forms spherocrystals upon evaporation of hot alcohol solutions, specific rotation of the plane of polarization

+ 192 °, the recovery ability is 10%;

+181 до +183°, восстановительная способность равна 36-43%.4) maltodextrin - does not react with iodine and does not precipitate with alcohol, specific rotation of the plane of polarization

+181 to + 183 °, the reduction ability is 36-43%.

After extrusion, the reagent is fed to the cooling conveyor and to the storage hopper, and then by grinding pneumatic transport. The extrudate is crushed in a hammer mill with a cyclone.

The crushed reagent is fed into the intermediate hopper. Then, if necessary, the reagent is sieved through a burate with 0.67 mm sieve openings, and large fractions are fed for re-grinding.

The crushed reagent entered the storage hopper and then for weighing and packaging.

It is allowed to pack the reagent in four-layer paper bags without additional packaging in fabric bags when transported only by road to a distance of not more than 350 km. The net weight of the reagent is not more than 30 kg.

It is allowed to pack the reagent in a soft disposable or reusable container with a polyethylene liner.

The net weight of the reagent in the container is not more than 1 t.

Allowed to use other types of containers, packaging and packaging materials permitted for use.

The reagent is transported by all types of covered transport in compliance with sanitary requirements and in accordance with the rules for the carriage of goods operating on the appropriate mode of transport.

During transportation, loading and unloading, the reagent must be protected from atmospheric precipitation. It is not allowed to transport the reagent together with products with a specific smell, as well as the use of vehicles in which toxic or sharp-smelling cargoes were transported.

The reagent should be stored in dry, clean and ventilated rooms at an air temperature of -30 to + 30 ° C and a relative humidity of not more than 75%.

The shelf life of the reagent is 18 months from the date of manufacture.

The following are examples of specific embodiments of the invention.

Example 1

Native potato starch is used as the starch-containing component, sapropel (the Pribylovichi Lake sapropel deposit: Lelchitsky district, Gomel region) is used as soil, and caustic soda (NaOH) is used as alkali.

A working mixture is prepared by mixing the starch-containing component, sapropel and alkali in a ratio of 10: 0.2: 1.

The prepared working mixture is subjected to extrusion processing. 36 samples are produced from the mixture, obtained under various extrusion process conditions. The main technological parameters of the extrusion process during the production of samples are presented in table 3.

In the production of extrusion samples, no additional water or additional component was supplied to the extruder.

The developed sample-1, sample-2, sample-3, sample-4, sample-5, sample-6, sample-7, sample-8, sample-9, sample-10, sample-11, sample-12, sample -13, sample-14, sample-15, sample-16, sample-17, sample-18, sample-19, sample-20, sample-21, sample-22, sample-23, sample-24, sample-25 , sample-26, sample-27, sample-28, sample-29, sample-30, sample-31, sample-32, sample-33, sample-34, sample-35 and sample-36 are thoroughly mixed in the ratio 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1.

The finished product (drilling reagent) is crushed and sieved using a steel wire woven mesh for the milling industry No. 067.

Example 2

Native potato starch and native corn starch in a 1: 1 ratio are used as the starch-containing component, sapropel (the Dikoe Lake sapropel deposit: Petrikovsky District, Gomel Region) is used as soil, and potassium hydroxide (KOH) as alkali.

A working mixture is prepared by mixing the starch-containing component, sapropel and alkali in a ratio of 10: 1: 1.

The prepared working mixture is subjected to extrusion processing. Extrusion sample-25 is produced (Table 3) as a result of five-time sequential extrusion processing without additional water supply.

The finished product (drilling reagent) is crushed and sieved using a steel wire woven mesh for the milling industry No. 067.

Example 3

A mixture of native potato starch and native tapioca starch in a ratio of 1: 2 is used as a starch-containing component, sapropel (Lake Buevskoye sapropel deposit: Liozno district, Vitebsk region) is used as soil, and caustic soda (NaOH) mixture is used as alkali and potassium hydroxide (KOH) in a ratio of 1: 1.

A working mixture is prepared by mixing the starch-containing component, sapropel and alkali in a ratio of 10: 0.5: 1.

The prepared working mixture is subjected to extrusion processing and 36 samples are produced, obtained under various technological modes of extrusion (table. 3). In the production of extrusion samples, water was additionally supplied to the extruder.

The finished product (drilling reagent) is crushed and sieved using a steel wire woven mesh for the milling industry No. 067.

Example 4

Native potato starch and potato flour are used as the starch-containing component, sapropel (the Black Lake sapropel deposit: Braslav district, Vitebsk region) is used as soil, and caustic soda (NaOH) and potassium hydroxide (KOH) are used as alkali.

A working mixture-1 is prepared by mixing a starch-containing component (native potato starch), sapropel and alkali (KOH) in a ratio of 10: 0.5: 1.

A working mixture-2 is prepared by mixing a starch-containing component (potato flour), sapropel and alkali (NaOH) in a ratio of 10: 1: 1.

Prepared working mixtures are subjected to extrusion processing and produce 20 samples obtained under various technological modes of extrusion (table. 3). Extrusion sample-1-sample-10 was obtained from working mixture-1, and extrusion sample-27-sample-36 was obtained from working mixture-2.

In the production of extrusion samples from the working mixture-1, water was additionally supplied to the extruder, and during the development of extrusion samples from the working mixture-2, additional water was not supplied to the extruder.

The developed samples are mixed in equal proportions. Then add 5 wt. % dextrins (mixtures of amylodextrin, erythrodextrin, achroodextrin and maltodextrin in a ratio of 1: 1: 1: 1) to the total weight of the mixtures and mix thoroughly.

The finished product (drilling reagent) is crushed and sieved using a steel wire woven mesh for the milling industry No. 067.

Example 5

As a starch-containing component, a mixture of native potato starch, potato flour and potato pulp in a ratio of 1: 1: 3 is used, and sapropel (the sapropel deposit “Lake Valverovo”: Postavy district, Vitebsk region) is used as soil, and a mixture is used as alkali sodium hydroxide (NaOH) and potassium hydroxide (KOH) in a ratio of 2: 1.

A working mixture is prepared by mixing the starch-containing component, sapropel and alkali in a ratio of 10: 0.9: 1.

The prepared working mixture is subjected to extrusion processing. Extrusion sample-1-sample-25 is produced (Table 3) as a result of two sequential extrusion without additional water supply to the extruder.

The resulting extrudate is crushed on a hammer mill. Then add 3 wt. % erythrodextrin and mix thoroughly.

The finished product (drilling reagent) is crushed and sieved using a steel wire woven mesh for the milling industry No. 067.

The finished reagents obtained in examples 1-5, the moisture content did not exceed 30%, and the pH of a 10% aqueous solution of the reagents did not exceed 12 units.

Thus, the developed method for producing a starch-containing modified drilling reagent is highly efficient, economical, and allows to obtain a product with good, stable consumer properties. It can be used for the preparation of various process fluids in drilling, injection and repair of wells: buffer fluids for killing, fracturing, mixing and processing grouting solutions, as well as for hydraulic fracturing, isolation of the influx of formation water.

In addition, the proposed reagent can be used in the foundry industry as a stabilizer of the molding sand. If the reagent was obtained without an additional component, then it can also be used in the food industry as a gelatinizer, stabilizer and thickener in the manufacture of waste, yoghurts, jelly products, ice cream, etc.

Claims (1)

A method of producing a reagent for drilling, involving the processing of starch-containing raw materials, characterized in that the reagent is obtained by mixing the starch-containing component with sapropel and with alkali (NaOH and / or KOH) in a ratio of 10: (0.2-1): 1 in terms of dry matter, followed by single or multiple extrusion processing of the mixture at 100-200 ° C, screw speed 50-100 rpm, die diameter 1-6 mm, followed by crushing and sieving, or the reagent is obtained by mixing extrudates of sapropel and starch aschego component developed at various extrusion process conditions, with each other or with dextrins (amylodextrin and / or eritrodekstrinom and / or ahroodekstrinom and / or maltodextrin); the humidity of the final reagent should not exceed 30%, and the pH of a 10% aqueous solution of the reagent should not exceed 12 units.

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