Phenomology composition for killing wells

 

The invention relates to the oil and gas industry, in particular foaming compositions, and can be used for plugging wells during repair work in conditions of abnormally low formation pressure. The technical result is the improvement of physico-chemical parameters panimulang composition: increasing the multiplicity of the foam, reducing filtration properties, reducing the pressure release, the increase of the coefficient of recovery of the permeability of the reservoir. Phenomology composition for plugging wells comprising an aqueous solution of calcium chloride density 1180-1200 kg/m3, an aqueous solution of condensed sulfite-alcohol stillage kssb 25% concentration, hydrocarbon liquid and a filler plant origin, as a filler plant origin contain grass meal, in the following ratio, wt.h.: this solution of calcium chloride 100, this solution kssb 26-28, carbon liquid 21-23, grass meal 4-11. And as herbal use flour milled vegetable waste grain loaves of bread, or legumes, or oil, or spinning crops, or a mixture of annual grasses and m is yuusei industry, in particular foamable compositions, and can be used for plugging wells during repair work in conditions of abnormally low formation pressure (anpd).

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

Known phenomology composition for killing the well, the recipe of which has the following ratio of components, wt.vol.%: Hydrocarbon fluid, such as gas condensate 17-32 Emulsifier, such as polycyclic sulfite-alcohol bard (kssb) - 5-13 calcium Chloride - 16-24 Chemically precipitated chalk (XOM) - 3-9 Bichromate of potash - 0,4-1,3 Water - other (see RF patent 2120027 from 14.05.96, CL E 21 In 43/00, 43/12, From 09 To 7/02, publ. in ABOUT 28, 1998).

The disadvantage of this structure are reduced physico-chemical characteristics and technological properties. Despite the fact that penemunde has lower values of the filter due to the presence in its composition HOM, this ingredient increases its content reduces foam. It is not possible to use the composition for plugging wells with abnormally low (high anomaly ratio) due to high density of panamoney.

In addition, the release layer after plugging the above composition must p is its permeability. These considerations lead to the need for acid formation treatment when it is released and cause long term development wells in the subsequent period. In the result of the presence in the composition of the emulsion, mineral filler (XOM), which serves as the solid phase and clogging of the pore space of the reservoir in the destruction of panamoney, even when processing layer of acid to dissolve the chalk to restore the permeability of the formation to levels close to daemonname, is not possible.

The closest analogue is phenomology composition for killing the well, the recipe of which has the following ratio of components, wt.h.: Calcium chloride aqueous solution density 1180-1200 kg/m3- 100 kssb, an aqueous solution of 25% concentration - 25-32
Hydrocarbon liquid - 18-26
Peat - 4-12
COFFS 0,07-0,37
(translated from the wt.% wt.h.: see RF patent 2152973 from 26.05.98, CL 09 To 7/08, publ. in ABOUT 20, 2000).

The disadvantage of this structure are reduced physico-chemical parameters and technological properties.

The presence phenomonenon part of COFFS lowers foam (depending on the number of entrained air), carried ante anomaly. The reduction ratio of panamoney due to the properties of furfuryl alcohol (part of the Coffs harbour) as antifoam. The composition is able to filter the liquid phase under the action of differential pressure, which adversely affects the permeability of the productive formation: the interaction of reservoir rock with a mineral component in the liquid phase of the foam composition leads to a change in the structure of the layer due to swelling of the binder material of the breed, and due to the possible formation of difficultly soluble products of the reaction of calcium chloride with formation water. In this case the permeability of the productive formation is reduced.

In addition, the high bridging ability of this composition, largely due to the adhesive properties of humates peat role adhesive substance, leads to the release layer after the completion of the work at elevated depression (pressure release - see test report). For weakly cemented friable productive layers, this can lead to dilatancy (repacking loose particles of rock with their compaction), which is the reason for reducing the formation permeability and well productivity after repair.

The technical result that can be obtained when implementing the present invention is that improved physico-chemical parameters panimulang composition:
- increases the ratio of the foam, which allows extending the range of application of the composition in various mining and geological conditions, including wells with abnormally low;
- decrease of the filtration properties of the foamable composition, which reduces the probability of interaction of the filtrate with the breed of the productive formation and to prevent the reduction of its natural permeability;
improved technological properties panimulang composition:
- reduced the pressure release that preserves its original capacitance-filtration properties of the productive formation and reduction of completion time;
- increases the rate of recovery of the permeability of the reservoir, which reduces the time well at dormantly the operation mode and allows you to get additional quantity of gas.

The technical result is achieved by using known panimulang composition containing an aqueous solution of calcium chloride density 1180-1200 kg/m3water RATEL of plant origin, where as a filler plant origin used herbal flour in the following ratio, wt. PM
Calcium chloride aqueous solution density 1180-1200 kg/m3- 100
Kssb, an aqueous solution of 25% concentration - 26-28
Hydrocarbon liquid - 21-23
Herbal flour - 4-11
Kssb use THE 39-094-75, calcium chloride according to GOST 4466-77. As the hydrocarbon liquid used diesel or gas according to GOST 305-82. Herbal flour is used according to GOST 18691-88. Forage grass artificially dried. Technical specifications (attached).

Herbal flour made from plant waste grain breads or cereals, or oil, or spinning crops, or a mixture of grasses annual and perennial plants that are rich in protein and fiber. To prepare the flour can also be used straw and chaff.

To crops include wheat, rye, barley, oats, maize, millet, sorghum, rice, buckwheat; legumes - peas, soybeans, lupins, beans, broad beans, rank, chickpeas, lentils; oil - sunflower, rapeseed, peanut, sesame; spinning cotton, flax, hemp; to annual plants - clover, vetch, seradella, Sudan grass; perennial - grass, Kleve, 1983).

Straw, mainly represented by the stems and leaves of plants remaining after threshing Mature seeds. Chaff consists of the outer integument of the seed particles of leaves, top hair pieces, immature seeds, the Testa.

The main composition of raw materials for herbal flour next, wt.%: protein 4,4-16,9; fat 1,3-7,5; cellulose 26,4-42,9; nitrogen-free extractives (NFE) 36,2-48,7; the ashes of 7.5 to 16.5 (see Composition and nutritive value of forages: a Handbook / I. S. Shumilin, G. P. Derzhavin, A. M. artiushin and others; Ed. by I. S. Shumilina. - M.: Agropromizdat,1986. 303 S.).

In the BEV group includes monosaccharides (glucose, fructose, galactose, arabinose, mannose, xylose), disaccharides (maltose, lactose, sucrose, nezakonoposlushnye polysaccharides (starch, pectin, hemicellulose), vegetable gum and mucilages, pigments, resins, tannins, organic acids, etc.

The table below shows the basic chemical composition of grass meal, made from a variety of agricultural crops and their waste.

The feedstock for the preparation of herbal flour from agricultural crops or waste pre-crushed in a cut with a particle size up to 100 mm in aggregates of type IR-3, GCI-SOA, RCC-6 and other Then the crushed mass with size cane grinding with the residue on the sieve (the cell size of 3 mm) not more than 5%.

The presence of particle-grass meal of a number of organic compounds with different functional groups leads to the implementation of the colloidal and physical properties of the resulting dispersed system.

The combined use of ingredients helps to get panimulang composition with the complex physico-chemical and technological properties that ensure the effectiveness of plugging wells with abnormally low in the process of renovations.

Proteins (proteins), as surface-active substances, possess some special properties that distinguish them from synthetic surfactants and Soaps. The equilibrium adsorption layer due to diffusion of globular molecules to the interface surface and deploy it the polypeptide chain, preventing the leakage of liquid from the foam. This also contributes to hardening of the adsorption layers of air bubbles formed globules of hydrocarbon liquid (I), which are the second dispersed phase (in the air) in the aqueous dispersion medium. When this surfactant-based lignosulfonate modified kssb in accordance with the reactions in Fig.1 adsorbed on the surface of the drops TOO, orientius the possibility of air bubble surface layers of the adsorption film, preventing the leakage of liquid from the foam.

The higher the ratio of the foam (in comparison with the prototype) is also due to the content in the herbal composition of flour surfactant-protein and NFE, which together with kssb cause intense foaming of the proposed structure. In the prototype is also used Coffs harbour, which is a component part of an antifoam, which explains the reduced foam. Increasing the multiplicity of the foam of the proposed structure allows the killing of wells with abnormally low at high anomaly ratio and to extend the range of use panimulang composition.

The presence of compounds with different structures due to the ability of the particles herbal flour to swell, the formation of highly viscous substances branched molecules (gum and mucus), calcium salts of complex composition.

Swelling of macromolecular compounds (IUD), which presents cellulose (starch), with the General formula (C6H10O5)n caused by the process of osmosis of water molecules in the particles grass meal. While significantly smaller water molecules can easily penetrate in the intermolecular space Navy polysaccharides having linear and branched structure swelling may increase by 5-8 times.

Vegetable gum and mucus containing polysaccharides, composed of hexose, D-hexuronic acid, pentose and methylpentane represent products with highly branched molecules. Due to the propensity to form high viscosity solutions of adhesive substances they increase the viscosity of the dispersion medium.

Thus, when the total absorption of water by cellulose herbal flour formed a system in which the dispersed particles of the Navy distributed dispersion in aqueous medium with high viscosity, which as a result of diffusion of water molecules in the intermolecular space Navy ceases to be solid, and performs the role of the interlayer between the individual particles of grass meal. This significantly lowers the filtration properties (increases the pressure start filtering) offer panimulang composition.

Hemicelluloses are represented by mixtures of different polysaccharides, the composition of which depends on the cultivar. The herbs contain pentosans, which upon hydrolysis split into nabrasyvanie aldopentose. The hemicelluloses are polysaccharides that contain uronic acid.

The carboxyl group of uronic acids hemicelluloses and D-hexuronate acids RA the hardening of the surface adsorption layers of bubbles of the foam and reduce its filtration properties.

Obtaining a sufficiently stable foam system with high ratio leads to the uniform distribution of particles herbal flour role of the solid phase. Organic herbal composition of flour determines the possibility of its physico-chemical interaction with forming foam system components, which dramatically increases the structural-mechanical properties panimulang composition as a whole, its resistance to external impact and other technological parameters.

The blocking properties of the claimed panimulang composition are realized due to the formation of the mesh of fibers and a separate particles grass meal, a cell which is filled with bubbles of air and hydrocarbon globules of liquid, which is the second dispersed phase panemuninkai system.

Phenomology composition with such a structure can withstand relatively high pressure drops in the reservoir, however, easily (at low pressures) is removed from the reservoir for depression in the course of its release. This is because the adsorption layers of the dispersed phase is represented by compounds with significantly weaker adhesion than when the delegations from peat due to the large content of humates. In the inventive phenomology composition is easily removed from the reservoir with minimum values of pressure release. In addition, the release layer by a low depression eliminates the possibility of dilatancy, which can be reduced to the natural permeability of the reservoir.

Due to the high pressure start filtering (i.e. low rate of filtration properties) of the inventive composition, and used in herbal flour, organic ingredients that can interact with calcium ions of the dispersion medium, decreases the likelihood that the liquid phase of the blocking material into the layer and its interaction with the breed that usually leads to swelling of the latest or clogging of its pore space products of the reactions.

Thus, in aggregate, the above properties panimulang composition contribute to a more complete restoration of the natural permeability of the reservoir.

Analysis of inventive step were as follows.

Know the use of bacteriophages herbal flour mixed with purified alumina, fine peat and ammonium nitrate to increase the level of cleaning in of pic herbal flour as macromolecular reagent in a mixture with calcium oxide in the manner of neutralizing neftegasgeodeziya waste with the aim of increasing the degree of neutralization (see Pat. 2154617 RF from 28.09.98,, CL 02 F 11/14, publ. at ABOUT 23, 2000), in the production method of carbon-mineral adsorbent as filler in the mixture of spent clay-containing drilling mud to improve the technical characteristics of the adsorbent (see U.S. Pat. 2151638 RF from 28.09.98,, CL 01 J 20/00, 20/08, 20/20, publ. at ABOUT 18, 2000).

We have not identified the sources of patent documents and scientific literature describing the use of herbal flour in proabortion compositions for well killing the claimed function. Thus, the technical result achieved due to the unknown properties of the ingredients of the considered structure and relationships between them. The invention is not obvious from the prior art, i.e., meets the condition of inventive step.

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

Example 1. Well 504 North Stavropol UGS was muted in order to conduct the audit of the tubing.

Data on the well
Production columnH,9 mm - 759,80 m
Tubing73 mm - 692,82 m
Artificial slaughter - 739,98 m
The current face - 692 m
Inter MPa
Capacity of 230 thousand m3/day
For killing SLE. 504 needed to cook 8 m3panimulang composition (PES). For this purpose, we used two cementing unit CA-320 and block making foamable composition of the two tanks (BPS).

In the tank bpps a smaller amount prepared to 4.8 m3or 5664 kg (100 wt.h.) solution of chloride of calcium density of 1180 kg/m3. To do this, 1133 kg of calcium chloride are dissolved with stirring using CA-320 4531 l of water.

In other capacity BPS larger cook 1.4 m3or 1586 kg (28 wt.h.) 25% solution kssb density 1113 kg/m3. To do this, 397 kg powder kssb dissolved in 1189 l of water with periodic mixing pump CA-320. Incubated for 1 day for complete dissolution of lignosulfonate kssb. Then in the same capacity 1,6 add3or 1303 kg (23 wt. h ) diesel fuel density 808 kg/m3and the mixture is stirred using CA-320, to obtain stable emulsions.

Using CA-320 with stirring in a container of emulsion served previously prepared in a separate vessel a solution of calcium chloride (4.8 m3). As soon as the mixture will be noted the first signs of foaming, it is injected at constant re is the cell size of 3 mm) not more than 5%. The mixture is stirred to obtain a ready-to-use homogeneous dispersion grass meal in the foaming liquid.

The discharge obtained foamable liquid with herbal flour into the well under pressure 2,82 MPa, exceeding the gas pressure at the mouth is CA-320 through to be included in the piping tube or annulus liquid-gas ejector for the purpose of aerating dispersions herbal flour and education PES.

After plugging wells PES carry out repairs. After the reservoir will unlock when the depression 150 kPa, and then produce the well completion of a two-phase foam, gradually reducing the back pressure on the reservoir to receive the flow of gas.

The application of the PES output time well at dormantly mode of operation (with a rate of 230 thousand m3/day) reduced from 30 to 3 days.

In the laboratory prepared PES by mixing the following components, wt. h/g:
Calcium chloride aqueous solution=1180 kg/m3- 100/200 or use 170 ml of the specified density
Kssb, an aqueous solution of 25% concentration - 28/56-50 ml=1113 kg/m3or dissolve 14 g kssb in 42 ml of water
Diesel fuel

Example 2. Prepared in the laboratory PES by mixing the following components as described in example 1, by weight. h/g:
Calcium chloride aqueous solution=1200 kg/m3- 100/200 or use 167 ml of the specified density
Kssb, an aqueous solution of 25% concentration - 26/52-47 ml=1113 kg/m3or dissolve 13 g kssb in 39 ml of water
The condensate=740 kg/m3- 21/42 or use 57 ml
Grass meal from baskets sunflower - 4/8
The obtained PES has the following physico-chemical parameters: the ratio of the foam 2.4 and pressure start filtering 2.8 MPa, as well as technological properties: pressure release 100 kPa, the restitution coefficient of permeability 0,98.

Example 3. Prepared in the laboratory PES by mixing the following components as described in example 1, by weight. h/g:
Calcium chloride aqueous solution=1190 kg/m3- 100/200 or use 168 ml of a solution of the specified density
Kssb, an aqueous solution of 25% concentration - 27/54-49 ml=1113 kg/m3or dissolve 13 is Ravana flour from the stalks of cotton 7/14
The obtained PES has the following physico-chemical parameters: the ratio of the foam 2.5 and pressure start filtering 3.3 MPa, and technological properties: pressure release 40 kPa, the restitution coefficient of permeability 0,98.

Content kssb in the composition of less than 26 wt.h., and hydrocarbon liquids less than 21 wt.h. netresource, because it does not ensure the formation of the foam system with the required process parameters.

Content kssb consisting of more than 28 wt.h., and hydrocarbon liquids about 23 wt. 'clock impractical, since a significant increase of the technological properties of the composition does not occur.

The herbal content of the flour in the composition of less than 4 wt.h. it is impractical, because it impairs the structural-rheological and filtration properties of the foam system, its blocking effect, and more than 11 wt.h. reduces foam and a recovery rate of formation permeability, and hinders the injection foam composition into the well, its delivery in the zone of the reservoir due to the sharp increase of rheological parameters.

The use of an aqueous solution of calcium chloride density less than 1180 kg/m3it is impractical, because it leads to lower pressure start filtering (i.e. increase Phi is Licia for full interaction with kssb and herbal ingredients flour), the application of calcium chloride density above 1200 kg/m3not enhancing technological properties of the composition, and therefore not economically feasible.

Compared with the prototype of the inventive foamable composition has improved on 18-71% foam, the pressure at the beginning of filtration increases 1.3-11.7 times, the restitution coefficient of permeability increases by 5.4-7.6%, and the pressure release is reduced 1.7-20 times.


Claims

1. Phenomology composition for plugging wells comprising an aqueous solution of calcium chloride density 1180-1200 kg/m3, an aqueous solution of the condensed sulfur-alcohol stillage kssb 25% concentration, hydrocarbon liquid and filler plant origin, characterized in that as a filler plant origin it contains herbal flour in the following ratio, wt.h.:
Calcium chloride aqueous solution density 1180-1200 kg/m3- 100
Kssb, an aqueous solution of 25% concentration - 26-28
Hydrocarbon liquid - 21-23
Herbal flour - 4-11
2. The composition according to p. 2, characterized in that as herbal flour contains pulverized plant on hoholitna plants.

 

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FIELD: oil and gas production.

SUBSTANCE: solid foaming agent containing, wt %: carboxymethylcellulose 15-25, sodium sec-alkyl sulfate 5-15 and sodium sulfonate 25-35 (both anionic surfactants), additionally contains: sodium silicate 3-7, sodium carbonate 2-4, disodium ethylenediaminetetraacetate as complexone 1-3, and foaming-enhancing detergent - the rest.

EFFECT: increased efficiency in carrying over formation fluid from bottom of gas and gas condensate wells.

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