Cross-linked liquid as sand-carrier

FIELD: petroleum-extracting industry.

SUBSTANCE: invention relates, in particular, to development of viscous-elastic liquids as sand-carriers for hydraulic disruption of low-penetrable gas- and oil-carrying seams in order to enhance their oil output. Proposed cross-linked liquid as sand-carrier based on hydrocarbon liquid and gel-forming agent comprises as a gel-forming agent a mixture of complexes of lithium tert.-butyltrialkyl borates - K [t-C4H9OB(OR)3]Li wherein R means (C4-C12)-alkyl, and a solvating agent - CA in the mole ratio K : CA = (1:1)-(1:2). As components of a gel-forming agent it comprises fraction of B(OR)3 wherein R means (C4-C12)-alkyl, and lithium tert.-butylate t-C4H9OLi in their mole ratio = 1:1, and in the following ratio of these components, wt.-%: trialkyl borates, 0.5-10.0; lithium tert.-butylate, 0.2-2.5, and hydrocarbon liquid, the balance. CA represents a compound of the following classes: saturated alcohol ROH, dialkyl esters R2O, primary H2NR, secondary HNR2, and tertiary alkylamines NR3 wherein R means (C4-C12)-alkyl. Invention provides expanding assortment of gel-forming agents, improvement of technological effectiveness of process in preparing liquid and enhancing its thermosedimentation stability.

EFFECT: improved and valuable properties of liquid.

3 cl, 3 tbl, 34 ex

 

The invention relates to the oil industry, in particular to the development of viscoelastic fluids - DESCONOCIDA for hydraulic fracturing of the deposition gas and niftiness reservoirs to improve oil recovery.

Known structured liquid-based aqueous solutions of polar polymers: polysaccharides, polyacrylic acid, polyacrylamide, polyvinylpyrrolidone, polyvinyl alcohol, polysulfones, Gurovich resins and complexes (cross-linking) salts of polyvalent metals [US patents: 4491526, 4417989, 4635727, 4518040, 4579670; applications CIS countries: 186034, 176190; PCT: 87/00236] have many disadvantages. The main ones are that structured liquid water-based well-filtered through the seam, especially calcareous and sandy rocks, making it difficult target (directed) their application, for example, in the technology of fracturing. The high water permeability of the composition of the fluid in the rock formation leads to the destruction layer in all directions, reducing the length and conductivity of the gap (crack) [J. Petrol. Technol. 1978, V.30, №1, P.132-140; 1983, V.35, No. 2, P.315-320]. In addition, the viscosity of the liquid water-based drops sharply with increasing temperature of the reservoir, which significantly reduces their peskiness ability and leads to premature sedimentation of the dispersed (disjoining) material./p>

Known gel-forming composition (base for liquids-DESCONOCIDA), which contains a hydrocarbon solvent, a polar solvent (alcohols, amines) and 25 wt.% polymeric complex, representing the product of the interaction of sulfonated polymer with aminecontaining polymer and the basic compounds of polyvalent metals [US patent: 4579671, MKI EV 43/26]. The disadvantages of this arrangement are a large concentration of polymers in solution (25 wt%), very slow solubility (expansion) of the polymers due to their high molecular weight of from 100000 to 1000000$, as well as a strong decrease of viscosity with increasing temperature. The decrease in molecular weight of the polymer accelerates the process of its dissolution, at the same time leads to an increase in the concentration of polymer required to obtain a satisfactory viscosity.

With the aim of reducing technical losses of fluids when creating the formation of cracks and transport them dispersed material was developed composition of hydrocarbon-based of the following composition, wt.%:

Alkilany ether phosphoric acid3-24
Sodium aluminate0.18-3.6
Hydrocarbon liquidthe rest of it.

The composition is prepared EOI is modestiam ether orthophosphoric acid with a basic compound of aluminum in a solution of a hydrocarbon with 51.7° With in 12 hours. The viscosity of the thus obtained liquid at the maximum concentration of the components is equal to 0.1-0.5 PA·when the strain rate 40-1[US patent: 4622155, MKI EV 43/26].

With the aim of changing the concentration of scarce complex this composition is modified by adding hydroxyethyl cellulose [patent UK: 2177711 And MCI 08L 1/26]. The modified composition with similar rheological characteristics has the following composition, wt.%:

Hydroxyethylcellulose45
Ether phosphoric acid0.1-4.6
Sodium aluminate0.05-0.5
Diesel fuel51.0-54.1

The disadvantages of these compositions are too large concentration of structural components, the long duration of viscosity increase (12 hours), low rheological characteristics, and the need for preparation of compositions at elevated temperatures (51.7° (C) complicate the technology they use for processes such as hydraulic fracturing.

Gel-forming composition based on organic phosphoric esters and aluminum compounds was improved by the Russian company "Himeko-Ganga" in terms of simplifying the process of making the El, increase its viscosity and thermal stability by replacing the inorganic aluminum compounds soluble in liquid hydrocarbons by isopropylate aluminum and ethylacetoacetate aluminum [patent RU: 2066737, MKI EV 43/00]. This company developed the production technology of the components of the gel-forming composition [patent RU: 2052462, MKI 07F 9/09].

Closest to the proposed technical substance is a gel-like hydrocarbon composition according to patent RU No. 2066737.

The main disadvantages of gel-like hydrocarbon composition (patent RU №2066737) is a very low rate of gelation (increase in viscosity) of the fluid. Thus, to obtain the gel 0.6 ml of an organic phosphoric esters in a special aromatic fractions were dissolved in 100 ml of diesel fuel, after which there under stirring was added the required amount of aluminium-containing component (activator). The resulting solution was left for one day for the swelling. The resulting complex between phosphoric esters and isopropenylacetate aluminum (aluminum chelate) is very hard to hydrocarbon liquids. For this reason it is without the constant mixing of the composition is separated (falls to the bottom) from the hydrocarbon liquid. To avoid phase separation requires intensive and post the constant stirring in the preparation and application of the composition, that energy-consuming and not technological. In addition, in the above composition according to the condition of its application it is necessary to introduce expensive destructor in capsulated form.

The objective of the invention is the expansion of the range of geleobrazovanie, avoiding the mentioned disadvantages of the prototype, as well as improving technological process of preparation of a liquid and increase of its thermoadaptation stability.

To solve this problem (getting structured liquid) developed a structured hydrocarbon liquid-pascnasitel based on mixed complexes of tert-BUTYLCARBAMATE lithium [t-C4H9OB(OR)3]Li, where R=C4-C12and solvotrode agent.

As components of the gel applied fraction trialkylborane IN(OR)3where R=C4-C12and tertbutyl lithium t-C4H9OLi when a molar ratio of 1:1 and the content of these components, wt.%:

Trialkylborane0.5-10.0
Tert-butyl lithium0.2-2.5
Hydrocarbon liquidthe rest,

and as solvotrode agent used compounds of the classes: fatty alcohols ROH, dialkylamino esters R2O pervi the cases H 2NR, secondary HNR2and tertiary alkylamines followed NR3where R=C4-C12. The best result (rheological and thermoadaptation characteristics) is achieved when in a structured liquid complex tert-BUTYLCARBAMATE lithium (K) and collaterali agent (SA) are contained at a molar ratio of K:CA= 1:1 to 1:2. Higher molar ratio of K:CA=1:2 excess solvotrode agent in a structured liquid (gel) produces destructurarea impact.

In working to solve the tasks applied trialkylborane4-C12synthesized in the laboratory and in pilot plants based on the corresponding fractions of fatty alcohol production in Russia and Celanese Chemicals Europe GmbH, tert-butyl lithium (TU 6-09-32-81-80). Fatty alcohols, dialkyl ethers and alkylamines followed as relative exchange constants agents used reactive compounds. As hydrocarbon liquids in the work were used diesel fuel (summer and winter), heptane fraction (GOST 85-05-80), heptane (TU 6-09-3375-78), the Soviet oil, the North - and South-kharampur oil fields. For measuring the sedimentation of the filler in a structured liquid - DESCONOCIDA was selected sand spherical shape with a particle size of 0.5-0.8 mm and an average weight of one particle 0.003, Viscoelastic characteristics of the structure is registered liquids are defined on the viscometer of RHEOTEST-2, sedimentation characteristics of the structured liquid-desconocidas obtained on laboratory sedimentometer. Evidence of achievement of the purpose of the invention is to increase the viscosity of the compositions in the temperature range 20-120°, improvement of rheological characteristics, thermal stability of the sand to sedimentation in the filled compositions. Rheological characteristics determined at strain rates 1.5; 170; 440-1the dependence of the dynamic viscosity on composition, concentration and temperature of structured liquids-DESCONOCIDA are shown in tables 1-2, the change in sedimentation characteristics of the filled compositions with 2 wt.% complex solvated mixture of alcohols in a molar ratio To:SS=1:2 depending on the temperature and concentration of the sand are given in table 3. The dynamic viscosity of the respective structured liquid is determined without filler. The compositions of structured liquids-DESCONOCIDA obtained as follows.

Example 1. In 66.59 g (66.59%) diesel fuel under stirring at room temperature dissolve 0.71 g (0.71%) of aliphatic alcohols With4-C12and 0.54 g (0.54%) of tert-butyl lithium, to the solution was added 30 g (30%) sand and 2.16 g (2.16%) trialkylborane C4-C12. After stirring for 10 min the composition with molny the ratio of K:CA=1:1 and the viscosity of the liquid is desconocidas 0.90 PA· (γ=170-1) left in a fixed position and observe the sedimentation filling. Sedimentation stability within 1 h equal to 92%. The effect of isolation formation permeability is 100%.

Examples 2-5 is similar to example 1.

Example 6. In 66.22 g (66.22%) diesel fuel under stirring at room temperature dissolve 0.78 g (0.78%) of aliphatic alcohols C4-C12and 0.60 g (0.60%) tert-butyl lithium, to the solution was added 30 g (30%) sand and 2.40 g (2.40%) trialkylborane C4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:1 and the viscosity of the liquid-desconocidas 1.32 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency isolation formation permeability is 100%.

Example 7. In 65.96 g (65.96%) diesel fuel under stirring at room temperature dissolve 0.84 g (0.84%) of aliphatic alcohols C4-C12and 0.64 g (0.64%) tert-butyl lithium, to the solution was added 30 g (30%) sand and 2.56 g (2.56%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:1 and the viscosity of the liquid-desconocidas 1.40 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency is solely formation permeability is 100%.

Example 8. In at 45.89 g (at 45.89%) diesel fuel under stirring at room temperature dissolved 1.41 g (1.41%) aliphatic alcohols and 0.54 g (0.54%) of tert-butyl lithium, to the solution was added 50 g (50%) of sand and 2.16 g (2.16%) trialkylborane C4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 1.09 PA· (γ=170-1) left in a fixed position. Sedimentation stability equal to 90% within 1 h Efficiency isolation formation permeability is 100%.

Examples 9-11 analogous to example 8.

Example 12. In 65.43 g (65.43%) diesel fuel under stirring at room temperature dissolve 1.57 g (1.57%) of aliphatic alcohols With4-C12and 0.60 g (0.60%) tert-butyl lithium, to the solution was added 30 g (30%) sand and 2.40 g (2.40%) trialkylborane. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 1.24 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 1 h at 100%. Efficiency isolation formation permeability is 100%.

Example 13 same as example 12.

Example 14. In 65.13 g (65.13%) diesel fuel under stirring at room temperature dissolve 1.67 g (1.67%) of aliphatic alcohols With4-C12and 0.64 g (0.64%) tert-butyl lithium is, to the solution was added 30 g (30%) sand and 2.56 g (2.56%) trialkylborane. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 1.31 PA· (γ=170 c-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency isolation formation permeability is 100%.

Example 15. In 67.98 g (67.98%) of heptane under stirring at room temperature for dissolving 0.42 g (0.42%) aliphatic alcohols and 0.32 g (0.32%) of tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.28 g (1.28%) trialkylborane. After stirring for 10 min the composition with a molar ratio of K:CA=1:1 and the viscosity of the liquid-desconocidas 0.12 PA· (γ=170-1) left in a fixed position. Sedimentation stability within 1 h equal to 83%. Efficiency isolation formation permeability is 100%.

Example 16. In at 37.98 g (at 37.98%) of heptane under stirring at room temperature for dissolving 0.42 g (0.42%) aliphatic alcohols C4-C12and 0.32 g (0.32%) of tert-butyl lithium, to the solution was added 60 g (60%) of sand and 1.28 g (1.28%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:1 and the viscosity of the liquid-desconocidas 0.12 PA· (γ=170-1) left in a fixed position. Sedimentation stability in those who tell 2 h equal to 100%. Efficiency isolation formation permeability is 100%.

Examples 17-19 analogous to example 16.

Example 20. In 67.48 g (67.48%) of heptane under stirring at room temperature dissolve 0.52 g (0.52%) of aliphatic alcohols With4-C12and 0.40 g (0.40%) of tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.60 g (1.60%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:1 and the viscosity of the liquid-desconocidas 0.20 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency isolation formation permeability is 100%.

Example 21. In 67.41 g (67.41%) of heptane under stirring at room temperature dissolve 0.89 g (0.89%) of aliphatic alcohols With4-C12and 0.34 g (0.34%) tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.36 g (1.36%) trialkylborane. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.18 PA· (γ=170-1) left in a fixed position. Sedimentation stability within 1 h equal to 90%. Efficiency isolation formation permeability is 100%.

Example 22. In 37.41 g (37.41%) of heptane under stirring at room temperature dissolve 0.89 g (0.89%) of aliphatic alcohols C4-C12and 0.34 g (0.34%) of tert-is utility lithium to the solution was added 60 g (60%) of sand and 1.36 g (1.36%) trialkylborane C4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.18 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 1 h at 100%. Efficiency isolation formation permeability is 100%. This composition is gradually heated on an oil bath to 105°C. At 70°With over 25 min settles 0% sand, 80°after 10 min settles 5.0-6.7% sand, 90°after 10 min settles 5.0-6.6% sand, at 105°after 15 min settles 15.1-16.7% sand.

Example 23. In 67.11 g (67.11%) of heptane under stirring at room temperature dissolve 0.99 g (0.99%) aliphatic alcohols and 0.38 g (0.38%) of tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.52 g (1.52%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.12 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 1 h at 100%. Efficiency isolation formation permeability is 100%.

Example 24. In 66.96 g (66.96%) of heptane under stirring at room temperature for dissolving 1.04 g (1.04%) aliphatic alcohols and 0.40 g (0.40%) of tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.0 g (1.60%) trialkylborane 4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.13 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency isolation formation permeability is 100%.

This composition is gradually heated on an oil bath to 105°C. At 70°With over 20 min settles 0.8-1.0% sand, 80°after 10 min settles 9.3-10% sand, 90°With over 19 min settles 2.7-3.5% sand, at 105°With over 20 min settles 4.0-5.0% sand.

Example 25. In 66.8 g (66.8%) of heptane under stirring at room temperature dissolve 1.10 g (1.10%) aliphatic alcohols C4-C12and 0.42 g (0.42%) tert-butyl lithium, to the solution was added 30 g (30%) sand and 1.68 g (1.68%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.18 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h at 100%. Efficiency isolation formation permeability is 100%.

Example 26. In 21.1 g (21.1%) of oil under stirring at room temperature dissolve 6.35 g (6.35%) of aliphatic alcohols C4-C12and 2.1 g (2.1%) of tert-butyl lithium, to the solution was added 60 g (60%) of sand and 10.4 g (10.4%) trialkylborane 4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the viscosity of the liquid-desconocidas 0.15 PA· (γ=170-1) left in a fixed position. Sedimentation stability for 2 h equal to 90%. Efficiency isolation formation permeability is 100%.

Examples 27-28 similar to example 26.

Example 29. In 97.12 g (97.12%) diesel fuel under stirring at room temperature dissolve 1.38 g (1.38%) alkylamines followed With4-C12and 0.3 g (0.3%) of tert-butyl lithium, to the solution was added 1.2 g (1.2%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas 160.92 PA· (γ=1.5-1) is heated in the cell retest with oil thermostat to 120°C. the viscosity of the liquid-desconocidas at a temperature of 70°is 125.16 PA· (γ=1.5-1), at 90° - 35.76 PA·, 120° - 58.11 PA·C.

Example 30. In 96.73 g (96.73%) diesel fuel under stirring at room temperature dissolve 1.57 g (1.57%) alkylamines followed With4-C12and 0.34 g (0.34%) tert-butyl lithium, to the solution was added 1.36 g (1.36%) trialkylborane C4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas PA· with (γ=1.5-1) is heated in the cell retest with oil thermostat to 120°C. the viscosity of the liquid-desconocidas at a temperature of 60°is 160.92 PA· (γ=1.5-1), at 90° - 44.70 PA·, 120° - 143.04 PA·C.

Example 31. In 96.15 g (96.15%) diesel fuel under stirring at room temperature dissolve 1.85 g (1.85%) alkylamines followed With4-C12and 0.4 g (0.4%) of tert-butyl lithium, to the solution was added 1.6 g (1.6%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas 357.60 PA· (γ=1.5-1) is heated in the cell retest with oil thermostat to 120°C. the viscosity of the liquid-desconocidas at a temperature of 60°is 160.92 PA· (γ=1.5-1), at 90° - 71.52 PA·, 120° - 107.28 PA·C.

Example 32. In 97.11 g (97.11%) diesel fuel under stirring at room temperature for dissolving 1.39 g (1.39%) dialkylamino esters With6-C10and 0.3 g (0.3%) of tert-butyl lithium, to the solution was added 1.2 g (1.2%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas 26.82 PA· (γ=1.5-1) is heated in the cell retest using the oil thermostat is about 120° C. the viscosity of the liquid-desconocidas at a temperature of 40°is 79.46 PA· (γ=1.5-1), at 90° - 19.87 PA·, 120° - 35.76 PA·C.

Example 33. In 96.72 g (96.72%) diesel fuel under stirring at room temperature dissolve 1.58 g (1.58%) dialkylamino esters With6-C10and 0.34 g (0.34%) tert-butyl lithium, to the solution was added 1.36 g (1.36%) trialkylborane4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas 35.76 PA· (γ=1.5-1) is heated in the cell retest with oil thermostat to 120°C. the viscosity of the liquid-desconocidas at a temperature of 60°is 119.19 PA· (γ=1.5-1), at 90° - 44.70 PA·, 120° - 39.74 PA·C.

Example 34. In 96.15 g (96.15%) diesel fuel under stirring at room temperature dissolve 1.85 g (1.85%) dialkylamino esters With6-C10and 0.4 g (0.4%) of tert-butyl lithium, to the solution was added 1.6 g (1.6%) trialkylborane C4-C12. After stirring for 10 min the composition with a molar ratio of K:CA=1:2 and the effective viscosity of the liquid-desconocidas 49.66 PA· (γ=1.5-1) is heated in the cell retest with oil thermostat to 120°C. the viscosity of the liquid-desconocidas at a temperature of 60°is 143.04 is a· with (γ=1.5-1), at 80° - 99.32 PA·s, 90° - 77.48 PA·, 120° - 59.59 PA·C.

The results are shown in tables 1-3, correspond to the formula of the invention and in comparison with the prototype show improvement in viscosity, thermal stability, thixotropy and sedimentation stability at higher temperatures. For example, the proposed structures of the structured liquid-desconocidas containing 1.0-2.0 wt.% complex gel, at a deformation speed of 170-1and 20°have an average viscosity of 4.0-7.0 PA·with (table 2, examples 27-31). In such thermal deformation conditions, the viscosity of the compositions according to the prior art (patent RU: 2066737) decreases in 3-5 times, and at a temperature of 80°With the maximum loss of viscosity of the composition is up to 90%. When the temperature is raised to 90 and 120°viscosity for the proposed structures of the structured liquid varies little, and for some solutions of solvate complexes even increases (table 2, examples 6, 8, 12, 29-31 (diesel) 20, 21, 24 (heptane)). Under these conditions, the constant non-Newtonian behavior of the fluid of the proposed formulations varies from-0.1 to 0.5 (table 2, examples 27, 33) characterizes them as vysokochastotnye that is of paramount importance for liquids-DESCONOCIDA. The proposed formulations in warp mode and condition is established high temperature, 120°With flow with high viscosity 36-107 PA·with (table 2, examples 27, 28, 30, 31), which further confirms the high tixo and thermotropism compositions. We offer structured hydrocarbon liquid-desconocido when the content of 2.0 wt.% complex - gelling and 60 wt.% sand remain sedimentation sustainable 100% up to a temperature of 70°and under 105°With sand sedimentary only 16.7% for 15 min (table 3, example 22). On the basis of obtained results it can be concluded that the proposed structured hydrocarbon liquid-desconocido characterized by ultra-high pescarese ability and stability at extremely high temperatures (120° (C) in comparison with the prototype (80°). The compositions of trialkylborane and relative exchange constants agents contained in a structured liquid, expand the range of geleobrazovanie due to the formation of numerous options and their combinations (combinations). Numerical and mass ratio alkylboron in fraction C4-C12and relative exchange constants agents in their factions you can vary that will allow you to choose the most technologically, economically and environmentally beneficial methods of preparation and application of structured liquids-DESCONOCIDA, as well as to expand the scope of their application. DL the liquid hydrocarbons, oil and light oil (condensate) concentration of gelling sufficient to 2.0-2.5 wt.%. To obtain a structured liquid on the basis of some oils containing large amounts of polar heteroatomic compounds, the concentration of gelling up to 8.0-12.5 wt.%. Increasing the concentration of gelling more than 12.5 wt.% oil does not alter the rheological and sedimentation characteristics of the structured liquid-desconocidas. With increasing filler content in a structured liquid termoelektrarna stability of the composition is increased (table 3).

Table 3
The temperature of the filled composition, °60% sand, example 2230% sand, example 24
The number of sedimenter bathing sand, %The duration of the sedimentation of sand, minThe number segmentierung sand, %The duration of the sedimentation of sand, min
70025 0.8-1.020
805.0-6.7109.3-1010
8510.2-11.61512-12 .410
905.0-6.6102.7-3.519
958.7-10.0101.0-1.45.5
10515.1-16.7154.0-5.020

1. Structured liquid-pascnasitel hydrocarbon-based liquid and gel, characterized in that as the gel-it contains a mixture of complexes of tert-BUTYLCARBAMATE lithium - K [t-C4H9OB(OR)3]Li, where R=C4-Ci2and collaterali agent - SA at a molar ratio of K:CA=1:1-1:2.

2. Structured liquid according to claim 1, characterized in that as component of the gel-it contains a fraction of trialkylborane B(OR)3where R=C4-C12and tertbutyl lithium t-C4H9OLi when a molar ratio of 1:1 and the content of these components, wt.%:

Trialkylborane0.5 to 10.0
Tertbutyl lithium0,2-2,5
Hydrocarbon liquidrest

3. Structured liquid according to claim 1, characterized in that as solvotrode agent it contains a connection from classes: fatty alcohols ROH, dialkylamino esters R2O primary H2NR, secondary HNR2and tertiary alkylamines followed NR3where R=C4-C12.



 

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FIELD: gas and oil production industry.

SUBSTANCE: invention relates to chemical compositions used in treatment of holes, among them absorbing holes, for decreasing hydrogen sulfide content in gaseous space in carrying out repairing, research and other works. Invention proposes a solid-phase composition for hydrogen sulfide neutralization that comprises the following components, wt.-%: surfactant, 0.5-7.4; polyvinyl acetate, 26.6-5.7 and water glass, 2.6-4.6 as reagent-stabilizing agents of foam, and sodium nitrite and sulfamic acid taken in stoichiometric ratio with respect to each component in reaction with hydrogen sulfide, the balance. Proposed composition can be used in gas and oil production industry under normal and low seam pressures. Invention provides development of effective and simple in preparing and technological composition used in neutralization of hydrogen sulfide in holes, enhancing neutralizing activity of hydrogen sulfide neutralizing agent with respect to hydrogen sulfide in seam space both in gaseous and dissolved state.

EFFECT: improved and valuable properties of composition.

6 tbl, 1 ex

FIELD: gas and oil production industry.

SUBSTANCE: invention relates to chemical composition used in treatment of holes, among them, absorbing holes, for decreasing the content of hydrogen sulfide in gaseous space in carrying out repairing, research and other works, and can be used in gas and oil production industry under conditions of normal and low seam pressures. Proposed composition comprises the following components, wt.-%: sodium peroxocarbonate, 10-40; surfactant (surface-active substance), 0.5-10; polyacrylamide, 0.02-0.1; sulfamic acid, 17-53, and sodium nitrite, 21-52. The slid-phase composition can comprise water glass also. Invention provides development of effective and simple in preparing and technological composition used for neutralization of hydrogen sulfide in holes.

EFFECT: improved and valuable properties of composition.

2 cl, 7 tbl, 2 ex

FIELD: oil and gas extracting industry.

SUBSTANCE: invention relates to damping holes in their overhaul repair. Proposed technological liquid used in damping oil and gas holes comprises the following components, wt.-%: microbial xanthane biopolymer, 0.5-2.0; modified starch, 0.2-2.5; surfactant (surface-active substance), 0.01-0.2; sodium carbonate, 0.1-1.0; aluminum power, 0.005-0.08, and water, the balance. Method for preparing indicated aphron-containing technological liquid used in damping oil and gas holes involves mixing its components to obtain two solution wherein one solution contains sodium carbonate and surface-active substance obligatory, and other solution contains aluminum powder. Mixing these solution is carried out at temperature from 50°C to 90°C. Invention provides preparing aphron-containing liquid for damping under static conditions without using special gas-dispersing equipment and based on available reagents.

EFFECT: improved and valuable technical properties of liquid.

2 cl, 3 tbl, 3 ex

Grouting mortar // 2322471

FIELD: gas and oil industry.

SUBSTANCE: invention relates to grouting mortars used in cementing casing strings in gaseous, gas-condensate or petroleum holes in zone of productive seam at moderate temperatures. Proposed grouting mortar comprises the following components, wt.-%: grouting Portland cement, 64.41-66.24; sulfacell, 0.13-0.40; microsilica MK-85, 0.33-1.99, and water, 33.20-33.30. Invention provides preparing grouting mortar of reduced water yield in face conditions and with simultaneous enhance of strength of cohesion of cement stone with a casing string.

EFFECT: improved and valuable properties of grouting mortar.

1 tbl, 1 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to synthesis of unknown early N-[alkylphenoxypoly(ethyleneoxy)carbonylmethyl]-morpholinium chlorides. Invention proposes novel compounds - N-[alkylphenoxypoly(ethyleneoxy)carbonylmethy]-morpholinium chlorides of the general formula: wherein R means aliphatic hydrocarbon radical comprising 8-12 carbon atoms; n means an average degree of oxyethylation equal to 3, 6, 7, and a method for synthesis of these compounds. Synthesized compounds possess property of inhibitors of asphalt-resin-paraffin deposits and can be used in oil industry for prevention of precipitation of asphalt-resin-paraffin deposits from the oil in its extraction, preparing and transporting.

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2 tbl, 7 ex

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil and gas production.

SUBSTANCE: invention relates to treatment of drilling fluids prepared using industrial-grade potassium chloride products produced according to GOST4568-95. Reagent for treating drilling fluids contains industrial-grade potassium chloride product together with anti-conglomeration reagent, namely aliphatic C16-C20-amines, added thereto during production. Reagent is composed of 75% orthophosphoric acid, 22.76-63.88%, double superphosphate, 18.06-38.62%, and water. In a method of preparing such reagent, double superphosphate is stirred in water at 1:1 ratio for 2-4 h at 40-50°C to form mixture, which is cooled to 20-30°C, and after addition of orthophosphoric acid vigorously stirred.

EFFECT: enabled preparation of sedimentation-stable compositionally uniform high-efficiency reagent preventing release of ammonia from drilling fluids and extended assortment of reagents for controlling drilling fluids.

2 cl, 1 tbl

FIELD: oil and gas well production, particularly to cement surface casing and producing well with abnormally low reservoir pressure.

SUBSTANCE: method involves serially injecting buffer fluid, plugging cement mix, aerated plugging cement mix and displacement fluid in well. Buffer fluid includes neonol-based foam generator in amount of 3-4% by weight, chemical reagent in amount of 2-3% by weight, nitriletrimethylphosphonic acid in amount of 0.2-1.0% by weight, remainder is water. Said buffer fluid is aerated or saturated with inert gas and injected in well. The plugging mix is solution with increased isolating ability having density of 1810-2000 kg/m3. Plugging mix contains (in parts by weight) Portland cement - 100, chemical reagent used in buffer fluid - 0.1-0.5, calcium chloride or aluminum sulfate - 2.0 and water - 48-50. In the case of surface casing cementing the injection is carried out in the following order: solution with increased isolating ability, solution with increased isolating ability saturated with air or inert gas up to density of not more than 1200 kg/m3. In the case of producing string cementing first of all solution with increased isolating ability is injected, then solution with increased isolating ability saturated with air or inert gas up to density of not more than 1300 kg/m3 is fed and finally solution with increased isolating ability is injected. Displacing fluid is supplied at the rate of 15-60 m3/hour.

EFFECT: increased efficiency.

4 ex, 1 tbl

FIELD: oil and gas well production, particularly to cement surface casing and producing well with abnormally low reservoir pressure.

SUBSTANCE: method involves serially injecting buffer fluid, plugging cement mix, aerated plugging cement mix and displacement fluid in well. Buffer fluid includes neonol-based foam generator in amount of 3-4% by weight, chemical reagent in amount of 2-3% by weight, nitriletrimethylphosphonic acid in amount of 0.2-1.0% by weight, remainder is water. Said buffer fluid is aerated or saturated with inert gas and injected in well. The plugging mix is solution with increased isolating ability having density of 1810-2000 kg/m3. Plugging mix contains (in parts by weight) Portland cement - 100, chemical reagent used in buffer fluid - 0.1-0.5, calcium chloride or aluminum sulfate - 2.0 and water - 48-50. In the case of surface casing cementing the injection is carried out in the following order: solution with increased isolating ability, solution with increased isolating ability saturated with air or inert gas up to density of not more than 1200 kg/m3. In the case of producing string cementing first of all solution with increased isolating ability is injected, then solution with increased isolating ability saturated with air or inert gas up to density of not more than 1300 kg/m3 is fed and finally solution with increased isolating ability is injected. Displacing fluid is supplied at the rate of 15-60 m3/hour.

EFFECT: increased efficiency.

4 ex, 1 tbl

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

Drilling mud // 2268909

FIELD: drilling wells; water-base drilling muds.

SUBSTANCE: drilling mud contains the following components, mass-%: clay, 1.5-3.0; carboxymethyl cellulose, 0.1-0.3;carboxymethyl starch, 0.75-1.5; mixture of ethers and amides of fatty acids and ethanol amides, 0.75-1.0; product of rectification of propylene oligomers of isoolefin type, fraction C13-C15, 0.75-1.5;lubricating additive, 0.5-3.0; the remainder being water.

EFFECT: enhanced inhibition ability of drilling mud at improved technological parameters.

2 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to drilling fluids used when boring oil and gas wells. Lubricating additive contains 10-30% tall oil, 15-20% polyglycols, 40-50% oxal flotation reagent, and 15-20% beet molasses.

EFFECT: increased stabilizing, lubricating, and antiwear properties of drilling fluid.

2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil production technology involving use of hydrochloric acid-based chemicals via complex hydrochloric acid effect on well bottom zone to intensify oil production and may be specifically used to increase oil recovery of viscous oil-saturated low-permeable carbonate reservoirs. Composition contains 22-28% of 20 vol % aqueous HCl solution, 7-8% of 98% aqueous acetic acid solution, and 65-70% of solvent based on light pyrolysis tar obtained as secondary product from petroleum processing enterprises.

EFFECT: increased well bottom zone treatment efficiency due to improved quality of treatment composition, in particular stability and dipping depth into formation.

4 tbl

FIELD: lubricants and boring engineering.

SUBSTANCE: multiple-purpose reagent containing lubrication-and-stabilization component (70-80%) and solvent (20-30%) contains, as said lubrication-and-stabilization component, oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons at ratio 2:3:4, and, as said solvent, diesel fuel or kerosene.

EFFECT: improved lubrication properties of viscous-plastic drilling fluids and stabilized inverted emulsions used in boring operation and in pullout of hole.

2 cl, 2 tbl, 6 ex

FIELD: lubricants and boring engineering.

SUBSTANCE: multiple-purpose reagent containing lubrication-and-stabilization component (70-80%) and solvent (20-30%) contains, as said lubrication-and-stabilization component, oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons at ratio 2:3:4, and, as said solvent, diesel fuel or kerosene.

EFFECT: improved lubrication properties of viscous-plastic drilling fluids and stabilized inverted emulsions used in boring operation and in pullout of hole.

2 cl, 2 tbl, 6 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides water-based solid phase-free biocationic drilling fluid with density 10-70-1520 kg/m3. Drilling fluid contains 10-60% of a cation spectrum, namely calcium and sodium chlorides, and 0.1-2% of polymer additive, in particular xanthane series biopolymer.

EFFECT: improved wall-plastering and lubrication properties.

2 tbl

FIELD: petroleum-gas-extracting industry.

SUBSTANCE: invention relates to materials used for cementing oil, gaseous, gas-condensate and geothermal holes under conditions of saline and hydrogen sulfide media. The salt-saturated plugging composition for high-temperature holes comprising a binding agent and sodium chloride includes additionally swollen vermiculite sand of fraction 0.3-2.5 mm in the following ratio of components, wt.-%: binding agent, 85-90; sodium chloride, 8-10; swollen vermiculite sand of fraction 0.3-2.5 mm, the balance. Invention provides preparing impermeable cement stone with enhanced coupling strength with a column in the range of temperatures 50-110°C.

EFFECT: improved properties of composition.

1 tbl

FIELD: petroleum and gaseous industry.

SUBSTANCE: invention relates to drilling oil and gaseous wells, in particular, to polymer-clay fluids for drilling used under conditions of permafrost rocks. Proposed polymer-clay fluid shows the improved pseudoplastic properties providing enhancing retaining and transporting capacity and treatment degree of the well walls, diminished filtration due to high rate in formation of low-penetrable filtration crust preventing the well pollution and promoting to retention of its collector properties, reduced rate of warming up of permafrost rocks that prevents formation of caverns and destruction of the well walls and as result provides prolonged retention of the well trunk in the stable state. Polymer-clay fluid for wells drilling in permafrost rocks doesn't freeze at negative temperatures and comprises clay, stabilizing agent as a mixture of polysaccharide reagent and structure-forming agent, hydrocarbon antifreeze and water. As a polysaccharide reagent the polymer-clay fluid comprises Acinetobacter sp. biopolymer, and as a structure-forming agent it comprises condensed sulfite-alcohol distillery grains in the following ratio of components, wt.-%: clay, 6-8; condensed sulfite-alcohol distillery grains, 4-6; Acinetobacter sp. biopolymer, 2-4; hydrocarbon antifreeze, 7-19, and water, the balance, wherein the ratio of Acinetobacter sp. biopolymer and condensed sulfite-alcohol distillery grain = 1:(1-3) mas. p., respectively. As hydrocarbon antifreeze, polymer-clay fluid comprises carbamide or glycerol. Invention provides enhancing effectiveness in drilling of wells in permafrost rocks.

EFFECT: improved properties of polymer-clay fluid.

2 cl, 15 ex

FIELD: oil and gas industry, particularly flowing well killing for underground repair and overhaul performing.

SUBSTANCE: method involves blocking perforation interval and part of well bottom zone by replacing well fluid with blocking fluid and killing liquid arranged over the blocking one. Free gas is removed from well before blocking fluid delivery to well bottom. Necessary liquid level at well head is provided by well operation stoppage for a certain time, which provides termination of formation fluid degassing in well bore and free gas lifting to well head. Tube space and hole annuity is filled with liquid in several steps along with discharge of gas portions. Gas portion discharge may not result in formation fluid rise inside well bore to level of formation fluid degassing. Density of liquid to be added in tube space and hole annuity provides well filling to head thereof. Well killing liquid comprises industrial magnesium chloride, alkali or alkaline-earth metal hydrate, alkali metal carbonate and pore sealant, for instance cacao-bean pods and fresh water taken in predetermined ratio.

EFFECT: increased efficiency, possibility to kill wells characterized by abnormally high permeability of production bed and high gas factor.

2 cl, 1 ex

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