Method of treating water-based process liquids used in drilling and well workover

FIELD: chemistry.

SUBSTANCE: in the method of treating water-based process liquids used in drilling and well workover, by adding a sodium halide-based clay inhibitor, the clay inhibitor is a furacilin preparation containing furacilin and sodium chloride in amount of 0.8-4.2 wt %.

EFFECT: high efficiency of the treatment method owing to improved inhibiting properties, wide range of clay inhibitors.

11 ex, 2 tbl

 

The invention relates to the oil and gas industry, namely, the processing of process fluids, water-based, used in drilling and workover.

Analysis of the existing state of the art showed the following:

- a method of processing drilling fluid used in drilling, sodium chloride to suppress swelling unstable clayey rocks (see Gorodnov E Physico-chemical methods of preventing complications in drilling. M.: Nedra, 1984. pp.33-35).

The disadvantage of this method of processing drilling fluid is the following.

Inhibitory effect of sodium chloride manifested in his introduction to the composition of the solution in an amount of not less than 5 wt.%, with increasing concentration (up to 20 wt.%) the inhibition efficiency increases, but it increases the cost of ongoing drilling due to the high consumption of reagent. In addition, solutions with a high content of sodium chloride require additional processing salt-tolerant agents, which leads to an increase in the cost of the work. Treatment of drilling fluid to the large number of sodium chloride leads to dilution, which in turn requires the introduction of additional thickening additives, and also increases the cost of conducting drilling of wells;

- as the prototype taken the way of chemical treatment of drilling fluids by introducing an inhibitor of clay, where as the reagent inhibitor is administered cremetoria sodium and/or potassium in an amount of 0.5 to 3.0 wt.% (A.S. USSR №1199786 from 07.04.1983, CL SC 7/02, publ. 23.12.1985, BI, No. 47).

The disadvantage of this method of processing drilling mud is the following. It is known that the greatest contribution to the inhibition of swelling clay minerals contribute cations of compounds that can displace the cations present in the native clay mineral, thereby inhibiting swelling.

When processing drilling mud by crematorium sodium, the latter inhibits clay minerals due to the presence in its composition of sodium ions. It is poorly soluble in water connection, the concentration of sodium ions is maintained at a low level, therefore, the efficiency of inhibition of clay minerals is low. Relatively high values of the degree of swelling, compared with crematorium sodium obtained by treatment of the drilling fluid by crematorium potassium due to the higher inhibitory effect of potassium ions, which are formed by dissociation of this compound. However, in this case, due to the low solubility of crematoria potassium, the concentration of potassium ions is maintained at a low level, therefore, the drilling fluid will have insufficient any abscopal properties, SL is therefore the efficiency of inhibition of clay minerals, such a solution will be low. Improvement inhibiting properties of the solution to a greater extent is not due to the introduction of crematorio sodium and/or potassium, and due to the presence included in the formulation of drilling fluids such ingredients as GPA, CMC, kssb, USR, chlorides of magnesium and sodium, oil, which have a high inhibitory effect.

This is confirmed by the comparison of the inhibition of clay minerals, reproduced by the authors of the present invention (see the test report, table 1). In addition, cremetoria sodium and potassium are toxic substances that have General toxic and irritating. The hazard class of these substances - II (hazardous substances).

The technical result that can be obtained when implementing the present invention is to enhance the efficiency of the method of treatment by increasing the inhibitory properties of process fluids, water-based, used in drilling and workover, expanding the range of inhibitors of clay.

The technical result is achieved by using a known method of processing fluids, water-based, used in drilling and workover, by introducing the inhibitor clay-based halide on the model. Which as indicated inhibitor clays enter drug furatsilin containing furatsilin and sodium chloride, in a quantity of 0.8 to 4.2 wt.%.

The claimed method meets the condition of "novelty."

Drug use furatsilin the following composition, parts by weight:

Furatsilin1
Sodium chloride40,

(Pharmacopeia FS 42-2611-96. Pharmacopoeial state Committee. The Ministry of health and medical industry of the Russian Federation, 1996). The specified medication furatsilin also described on the Internet at the following sites:

http://www.rlsnet.ru/tn_index_id_5396.htm;

http://www.nsk.vedun.ru/l_med_lecvo_info.php?scrmode=comp&id_lecvo=1992;

http://www.reles.ru/cat/tradefm/Tabulettae%20Furacilini%20ad%20usum%20extemum%20002%20g/5;

http://slovari.yandex.ru/~%D0%BA%D0%BD%D0%B8%D0%B3%D0%B8/%D0%A0%D0%9B%D0%A1/%D0%A4%D1%83%D1%80%D0%B0%D1%86%D0%B8%D0%BB%D0%B8%D0%BD/.

The processes in the system process liquid - clay rock", accompanied by the absorption of water with the release of energy, leading to softening clay rocks (up to 30-50% or more)reduction in failure resistance (70%). In addition, if clay rocks are limited in volume and volumetric expansion of their difficult, developing internal voltage swell, reaching values greater than the resistance to destruction.

Clay - rock, with a number of unique properties, the most important of which are the ability to dispersion in the aqueous medium and the swelling in her. When the swelling of clay minerals in the water around the exchange cations are formed hydrate shell. The highest swelling capacity in water has montmorillonite, in which the main exchange cation is Na+. Clay (bentonite) refers to porous sorbents. Its structure has a primary and secondary porosity. Primary porosity due to the crystalline structure of minerals, secondary pores formed by gaps between the contacting particles. While adsorption of polar substances lattice primary then expands, and packet space is embedded one or more layers of adsorbate - inhibitor. The specific surface of the primary pores reaches 420-470 m2/year primary secondary radius then is 5-10 nm, specific surface area does not exceed 60 m2/, depending on the properties of process fluids in contact with their unstable clayey rocks of the possible swelling of the latter or their disintegration. Swelling occurs under the action fresh, alkaline or brackish solution. Most exposed to process fluids clay montmorillonite group. Swelling, produced by the walking in the hydration of the clay material layer, is the result of adsorption, osmotic and capillary forces holding the water in a structured system. A large part held by clay particles in water is in a bound state. If clay rock is in the form of a suspension in an aqueous solution and the water molecules can penetrate between the individual layers of cells, the cations of the mineral roam freely and can exchange with cations present in solution.

In the claimed method of treatment as an inhibitor of clay inhibitor use clay-based halide sodium - drug furatsilin containing furatsilin and sodium chloride, in a quantity of 0.8 to 4.2% of the volume of process fluids.

Know the use of salts of metals of groups I and II of the Periodic system - KCl, NaCl, PA2SiO3, CaCl2, MgCl2to prevent swelling of clay minerals. However, the efficient inhibition of clay minerals occurs when the content in the process fluid of large quantities of these salts.

The inhibitory effect of the drug furatsilin due to the mutual influence of its components: furatsilina - (2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide) and sodium chloride. The presence of the drug furatsilin 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide increases inhibiting properties about emotively they process fluids. Based on laboratory studies, the authors found that the proposed processing inhibitor of swelling clays in the claimed amount is a synergistic blend of two ingredients, which allowed the authors to set the amplification of inhibitory capacity of the processed fluids. Reduction of swelling clay in a solution of the drug furatsilin explained by the emergence of new defined on the nature of the relationship. The formation of the latter is as follows. On the surface of particles of a clay mineral has hydrophilic and hydrophobic centers adsorbate that can happen selective sorption as medicationabana molecules 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide and ions, which dissociates sodium chloride. He can absorb hydrophobic groups on the hydrophobic centers of the adsorbent, and the hydrophilic groups on the hydrophilic centers of the adsorbent. If these areas belong to different mineral particles, along with the processes of change in physico-chemical properties of minerals processes associated with the formation of incremental structural relations and hardening of soil mass as a whole, resulting in the reduced ability of the stabilized mineral to swell in water.

2-[(5-nitro-2-furanyl)methylene]hydrazinic the amide can act as a cation, and anion due to the presence in the molecule of nitro group:

Due to the presence of a positive charge on the nitrogen atom of 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide can act as ion exchange, replacing the inorganic cations of the interlayer space of the clay mineral. During the application process fluids water-based drilling and workover treated with drug furatsilin, is the surface modification of clay rocks, which manifests itself in changes in the chemical nature of the external and internal silica oxide particles surface, the displacement of interlayer water and the exchange of cations of alkali and alkaline earth metal per mole of 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide.

In the course of these processes decreases the effective volume of the adsorption space, resulting in a sharp decrease in swelling capacity of the mineral. Molecule 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide affect secondary porosity clays, because of the following. In the molecule of 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide contains a-NH-acidic centers due to the electron-withdrawing ability of the nitro group and a carbonyl oxygen, with the possible substitution of the proton cations Fe2+and Fe+ that act as Lewis acids, and the formation of coordination compounds with nitrogen atoms as ligands. These coordination compounds of metals with 2-[(5-nitro-2-furanyl)methylene]hydrazinecarboxamide are water-insoluble substances, which will prevent the penetration of water molecules in the interlayer space of clay rocks.

The introduction of the drug furatsilin containing furatsilin and sodium chloride, in process fluid at less than 0.8 wt.% from their volume leads to an increase in the degree of swelling clays.

The introduction of the drug furatsilin containing furatsilin and sodium chloride, the process liquid in the amount of more than 4.2 wt.% impractical as it does not lead to a complete dissolution of the drug furatsilin, leads to excessive reagent.

Thus, according to the above, to achieve the claimed technical result.

The claimed method meets the condition of "inventive step".

In more detail the essence of the invention is described in the following examples.

Examples (lab).

Table 1 shows the values of the degree of swelling clays after contact with water (example 1) and an aqueous solution of the drug furatsilin containing furatsilin and sodium chloride, with different samples of clay.

table 2. Examples No. 1, 2 - properties of process fluids without treatment by the proposed method.

Example No. 3. Process the process liquid used in workover containing SEANEC TU 5 g (0.5 wt.%) and 987 ml (98,7 wt.%) water, by introducing 8 g (0.8 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=7,5, viscosity T=45 s, plastic viscosity η=12 MPa·s dynamic shear stress BPS=67 DPA, static shear stress in 1/10 min SNA=19/19 DPA, yield f=5.5 cm3/30 min, the nonlinearity coefficient n=0,4, the degree of swelling of the clay sample is 2.1.

Example No. 4. Process the process liquid used in workover containing SEANEC TU 5 g (0.5 wt.%) and 953 ml (95,3 wt.%) water by entering 42 g (4.2 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=7,5 T=28 s, η=14 MPa·s, BPS=69 DPA, SNA=19/19 DPA, f=5.5 cm3/30 min, n=0.45, and the degree of swelling of the clay sample is 1.2.

Example No. 5. Process the process liquid used in workover containing SEANEC TU 5 g (0.5 wt.%) and 970 ml (97 wt.%) water by entering 25 g (2.5 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=7,5 T=50,0 s, η=10 MPa·s, BPS=58 DP is, SNA=16/16 DPA, f=5.3 cm3/30 min, n=0.4 degree of swelling of the clay sample is 1.6.

Example No. 9. Treated process fluid used in drilling wells containing 81 g (8,1 wt.%) bentonite, kssb-2M 150 g (15 wt.%) and 761 ml (76,1 wt.%) water by the introduction of 8 g (0.8 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=8,2, T=38, η=16 MPa·s, BPS=40 DPA, SNA=48,2/55,2 DPA, f=5.5 cm3/30 min, the degree of swelling of the clay sample is 1.9.

Example No. 10. Treated process fluid used in drilling wells containing 81 g (8,1 wt.%) bentonite, kssb-2M 150 g (15 wt.%) and 761 ml (76,1 wt.%) water by the introduction of 8 g (0.8 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=8,2, T=38, η=16 MPa·s, BPS=40 DPA, SNA=48,2/55,2 DPA, f=5.5 cm3/30 min, the degree of swelling of the clay sample is 1.6.

Example No. 11. Treated process fluid used in drilling wells containing 81 g (8,1 wt.%) bentonite, kssb-2M 150 g (15 wt.%) and 727 ml (72,7 wt.%) water through the introduction of 42 g (4.2 wt.%) drug furatsilin containing furatsilin and sodium chloride. Mix. Define the properties of a solution: pH=8,2, T=36, n=18 MPa·s, BPS=42 DPA, SNA=50/56 DPA, f=5.4 cm3/30 min, the degree of swelling of the clay sample is 1.2.

Thus, the proposed solution meets the moustache is the conditions of "novelty, inventive step and industrial applicability", that is patentable.

Table 1
The ACT of laboratory tests
№ p/pThe content of the inhibitor in solution, wt.%The contact time with the solution, hThe degree of swelling clay rocks
the bentonite clayclay SLE. 934 North Stavropol field interval 740-745,6clay SLE. 7962-sandy interval 3144,8-3159,0 (composed)
123456
10246,03,62,6
20,8244,02,02,1
3 2,5242,91,51,6
44,2241,81,31,2
50,7244,82,22,2
64,3241,71,21,1
Similar
Sodium chloride 2.5 wt.%244,22,12,3
The placeholder
7Crematoria sodium 1 wt.%245,32,51,9

Table 2
№ p/pComponent composition, wt.%Properties of fluids
pHviscosity Tplastics
Kai viscosity η, MPa·s
dynamic voltage
the shift τ0, the AAA
static
some voltage
the shift in 1/10 min, the AAA
vodoohda
cha f, cm3/30 min
ratios
UNT nonlinearities n
the degree of swelling of the sample bentonite clay
12345678910
1SEANEC TU - 0,57,556,8752,714/145,80,4 4,0
Water - 99,5
2SEANEC TU - 0,5826,0126719/195,60,543,5
Sodium chloride and 0.5
Water - 99,0
3SEANEC TU - 0,57,545126719/195,50,42,1
The drug furatsilin - 0,8
Water - 98,7
4SEANEC TU - 0,57,528146919/195,50,45 1,2
The drug furatsilin - 4,2
Water - to 95.3
5SEANEC TU - 0,57,550105816/165,30,41,6
The drug furatsilin - 2,5
Water - 97,0
6SEANEC TU - 0,57,556,8752,714/145,80,43,5
The drug furatsilin - 0,7
Water is 98.8
7SEANEC TU - 0,57,528146919/190,451,18
The drug furatsilin - 4,3
Water is 95.2

Continuation of table 2
12345678910
8Bentonite - 8,18,240153832,8/44,36,5-the 3.8
Kssb-5 - 15
Water - 76,9
9Bentonite - 8,18,238164048,2/55,2 5,5-1,9
Kssb-2M - 15
The drug furatsilin - 0,8
Water is 76.1
10Bentonite - 8,18,238164048,2/55,25,5-1,6
Kssb-2M - 15
The drug furatsilin - 2,5
Water - 74,4
11Bentonite - 8,18,236184250/56of 5.4-1,2
Kssb-2M - 15
The drug furatsilin - 4,2
Water - 72,7
12Bento is it 8,18,238164048,2/555,5-3,0
Kssb-2M - 15
The drug furatsilin - 0,7
Water is 76.2
13Bentonite - 8,18,236184252/54of 5.4-1,2
Kssb-2M - 15
The drug furatsilin - 4,3
Water - 72,6
Note:
* - hydrologists montmorillonite content of montmorillonite up to 75%.
** - hydrologists montmorillonite content of montmorillonite to 7%.

1. The degree of swelling clays - a relative increase of the mass or volume of sample clay to a specific point in time at a given temperature. The degree of swelling is Lin define the device structure lie on a difference between the volume of the liquid from the experience, and the amount of unabsorbed liquid (workshop on colloidal chemistry: textbook / Under. edit M.I. of Gelfman. - SPb.: publishing house "LAN", 2005. - 256 S.).

2. The rheological properties of the solution is determined on rebeccasommer "Fann-35A".

3. Water yield is determined on the filter press "Baroid" when Δ=0.1 MPa.

The way to handle process fluids water-based, used in drilling and workover, by introducing the inhibitor of clays on the basis of sodium halide, characterized in that as an inhibitor of clays enter drug furatsilin containing furatsilin and sodium chloride, in a quantity of 0.8 to 4.2 wt.%.



 

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23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method of oil-gas wells killing on deep water subsea deposits by pumping of certain volume of kill composition together with sea water into the well thus providing creation of killing spout in the well with timeless pressure on formation exceeding formation pressure not less than 1.2 times, as a killing composition, preventing immediate contact of cold sea water with overheated formation fluids and productive stratum of formation, large hydrophobic disperse system is used with density exceeding density of sea water more than 5 times in the volume ensuring in bottom-hole zone of the well creation of spout of large hydrophobic disperse system with height exceeding productive stratum formation opened by perforation not less than 3 times. Mentioned disperse system is a disperse system with volume of 70%, where as disperse medium hydrocarbon liquid is used, this liquid doesn't set solid under temperatures to -10°C, its density is not less than 0.860 g/cm3; as disperse phase a mixture of hard metal balls with diameter within 1-2 mm is used, 50% of this ball mixture volume have fusion temperature well over bottom-hole temperature, and the other 50% of this ball mixture volume have fusion temperature 10°C and more below bottom-hole temperature.

EFFECT: improving reliability of oil-gas wells killing on deep water subsea deposits with excessive temperature and pressure of productive formation.

3 cl, 2 tbl

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