Foamable composition for killing wells

 

(57) Abstract:

The invention relates to the oil and gas industry, in particular foaming compositions for plugging wells during repair work in conditions of abnormally low formation pressure. The technical result is to increase the multiplicity of the foam while maintaining stability, improved blocking properties, reducing the filter into the reservoir by increasing the speed of formation of the low permeability of the filtration barrier, reducing the natural permeability of the productive strata after release, reducing the time of development. Foamable composition for killing wells, consisting of a foaming agent based on an aqueous solution lignosulfonates reagent, a foam stabilizer is a hydrocarbon liquid, a solid phase - filler plant origin and the aqueous phase is an aqueous solution of calcium chloride, contains as a solid phase mixture of shredded sprouts three-day barley and powdery lignosulfonates reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes, the ratio, by weight.h., equal to 1:0.5 to 2.0 sootvetstvuyushiye ingredients wt.%: the foaming agent based on an aqueous solution lignosulfonates reagent 4-20, hydrocarbon liquid 12-31, the mixture 3-10, an aqueous solution of calcium chloride density 1120-1280 kg/m3the rest, and as a foaming agent based on an aqueous solution lignosulfonates reagent it contains an aqueous solution density 1130 kg/m3lignosulfonates reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes. 1 C.p. f-crystals.

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 (anpd).

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

known fluid for plugging wells comprising the following ingredients, wt.%:

The dispersed phase-lime - 10-30

The dispersion medium is a solution of chloride salts of sodium, magnesium, aluminum - 5-25

The foaming agent is a waste of isopropyl alcohol from the stage sludge of crude alcohol and rectification of epurate (DESCRIPTION) - 0.5 to 1.5

Reagents-reducers Phil is

The disadvantage of this fluid are low frequency and as a consequence, high density, low blocking ability and high filtering it into the reservoir, reducing the natural permeability of the productive strata after release and as a consequence the increase in the time of well completion.

Low ratio - the ratio of volume of foam to the volume of foaming of the liquid due to the fact that as a foaming agent used in the DESCRIPTION, which consists of low molecular weight organic materials having a low surface activity, which in turn leads to an increase in the density of the resulting foam and does not provide effective damping in the conditions of abnormally low.

The composition has high filtration characteristics in the reservoir and contains a large number of disperse phase (lime), which does not form a filtration barrier on the walls of the borehole and large pore channels, and easily penetrates through high permeability channels deep into the reservoir, does not provide reliable plugging highly permeable formations with abnormally low, heavily pollutes the bottomhole formation zone, which reduces the natural permeability. To restore the last is necessary to remove the dispersed Sweeny wells;

as the prototype was taken foamable composition for killing wells, consisting of the following ingredients, wt.%:

Distillation residues from the production of furfuryl alcohol (Coffs harbour) - 0,05-0,022

Condensed sulfite-alcohol bard, an aqueous solution of 25% concentration - 17-19

The foam stabilizer is a hydrocarbon liquid - 12-15

Solid phase - peat - 3-7

An aqueous solution of calcium chloride density 1180-1200 kg/m3- Rest

(see RF patent 2152973 from 26.09.98, CL 09 To 7/08, publ. in ABOUT 20, 2000).

The disadvantage of this foamable composition is a low multiplicity and as a consequence, high density, poor blocking ability of the composition and its high filtering in the reservoir due to the slow formation of the low permeability of the filtration barrier, the increase in the time of well completion.

The low frequency part due to the fact that one of the components of the surface-active substances - Coffs harbour consists mainly of alcohols (furfuryl and diols), which, as you know, are defoamers and destabilization pseudodimension films (adsorption films between the bubbles and the globules of hydrocarbon liquids).

On the high density of this foam does not provide an effective plugging of wells with abnormally low and the presence of drained, high-permeability layers, since the killing of wells with a high degree of abnormality, when the reservoir pressure is 0.1 to 0.5 from hydrostatic, only the foam with a low density can reduce or completely eliminate the excess pressure (repression) on the layer and to prevent absorption of the composition prior to the formation of reliable filtration barrier filler particles. Peat as a filler has a loose, legkodeformiruemyh structure and does not provide a high speed of formation of the low permeability of the filtration barrier.

The high permeability of the filtration barrier in the initial period of injection of the foaming agent, i.e., low blocking ability leads to a significant penetration of the composition of the filter into the reservoir at a high permeability reservoir channels, which will reduce the permeability of fluids and increase the completion time and output wells on diamontie performance, since penetrated in the bottomhole formation zone foam has a high resistance and, therefore, will be very slow to break down in the bottomhole formation zone and does not rule out the operations on his release from a stable foam.

The permeability of the filtration barrier of the treatment pressure, when the clutch is provided elastically-deformable particles of peat, therefore, withstanding high pressure (pressure breakthrough foam screen up to 42 MPa) after the formation of mud cake, peat filler does not ensure the formation of low-permeability filter (temporarily block a barrier at low repression (high performance filtration through a sand core in the repression of 0.7 MPa, usual in the case of plugging wells with abnormally low).

In addition, the accumulation of peat particles on the walls of holes or perforations can lead to the formation of plugs in the wellbore and having surgery to remove them.

The technical result that can be obtained by carrying out the present invention, is as follows:

- increases the multiplicity of the composition and as a consequence decreases its density while maintaining sustainability indicators (stability),

- increase the blocking properties of the composition and reduces its filtration into the formation by increasing the rate of formation of the low permeability of the filtration barrier,

- preserves the natural reservoir permeability after release, which reduces the time in, consisting of a foaming agent based on an aqueous solution lignosulfonates reagent, a foam stabilizer is a hydrocarbon liquid, a solid phase - filler plant origin and the aqueous phase is an aqueous solution of calcium chloride, which contains as specified filler blend of shredded sprouts three of barley with the powdery lignosulfonates reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes in the ratio of wt.h., equal to 1:0.5 to 2.0, respectively, and an aqueous solution of calcium chloride density 1120-1280 kg/m3in the following ratio of ingredients, wt.%:

The specified foam - 4-20

Hydrocarbon liquid - 12-31

The specified mix - 3-10

This solution of calcium chloride - Rest

as specified foaming agent contains a reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes in the form of an aqueous solution density 1130 kg/m3.

For the preparation of the use of lignosulfonate technical lsls on THE 13-0281036-05-89, condensed sulfite-spirent on THE 39-01-08-348-78, lignes on THE 17-06-811-94 and their aqueous solutions by density 1130 kg/m3, calcium chloride according to GOST 450-77, diesel or gas condensate according to GOST 305-82, shredded sprouts three of barley.

The lignosulfonate - anionic surfactants are salts of lignosulphonic acids, are formed in the sulfite pulping of wood and represent derivatives of lignin, including hydrocarbon chain with methylated residues of aromatic nuclei and ionic group SO3H. the Molecular weight lignosulfonate varies in a very wide range from 200 to 200,000 and above.

Lignosulfonates in the proposed foaming composition are in two forms: as a foaming agent in the form of an aqueous solution density 1130 kg/m3and in a mixture with shredded sprouts three barley in powder form. Solutions lignosulfonate reagents have high foaming and emulsifying abilities.

The presence of a foaming composition of calcium chloride leads to the gradual salting out (separation of a substance from a solution) of high molecular weight fractions lignosulfonates reagent and at the same time prevents the dissolution of the solid fuel is="ptx2">

The salt concentration at which the process begins vysalivaniya - threshold vysalivaniya determined by the turbidity of the solutions and jump optical density, because lignosulfonates have multifraction composition and concentration (threshold) vysalivaniya decreases with increasing molecular weight substances, it is legitimate to talk about the concentration of vysalivaniya for the most part, high molecular weight lignosulfonate fractions, because first of all begin to Myslivets they.

For the proposed lignosulfonate most of their high molecular weight fractions begins to Myslivets in solutions of calcium chloride density of 1120 kg/m3and higher and respectively in the solutions of these densities will not dissolve powdered lignosulfonate added as a filler in a mixture with crushed barley grass. By reducing the density of a solution of calcium chloride powder lignosulfonates will dissolve and lose its blocking properties. In solutions of calcium chloride density above 1280 kg/m3there is a selection of solid particles lignosulfonate, not having colloidal properties.

Under vigorous stirring a foaming composition first emulsione hydrophilic emulsion. Colloidal salting out lignosulfonate adsorbed on the surface of the globules hydrocarbon liquid leads to the formation of a very stable adsorption layer with a gel-like structure and prevents the destruction of the emulsion.

In the foaming composition of the decisive role played by low molecular weight lignosulfonate fraction, because they have a high diffusion ability to interface solution - air and high air entrainment effect.

Macromolecules of low molecular weight lignosulfonate fraction adsorbed on the surface of the partition aqueous solution - air, orienting hydrophobic ends in the direction of air bubbles, and hydrophilic - water solution. They form a solid film surrounding the bubbles and prevent leakage of liquid from the foam.

In the emulsification and subsequent foaming of the foamable composition forms a foam with a strong interfacial surface and high magnification, including two of the dispersed phase globules hydrocarbon liquid and air bubbles. Speed vysalivaniya in such a system dramatically slows down, so on the surface of the globules hydrocarbon liquid gel cf> The highest stability of the resulting foam are provided by linking water adsorption layers on the surface of the globules of the hydrocarbon liquid and air bubbles, as well as mechanical barriers to the movement of fluid from mezhplanetnogo space - booking mezhplanetnogo space and air bubbles particles of shredded sprouts three barley, powdered lignosulfonate reagent and the hydrocarbon globules of liquid.

Mix sprouts of barley with the powdery lignosulfonates reagent provides high speed of formation of low-permeability, fine, weakly associated with the reservoir, lakodalmas filtration barrier, which is the basic condition for high quality kill the well, because it prevents the penetration of the composition in the bottomhole formation zone already at the initial stage of injection.

The presence in the composition of the particles of crushed barley sprouts necessary for initial overlap large reservoir channels (primary bridge connection).

Solid particles of powdered lignosulfonate reagents penetrate into the voids and pores of the primary bridge connection and block and is covered with adsorption layers of molecular and colloidal soluble fraction of lignosulfonates.

Adsorption layers on the particles sprouts of barley and powdery lignosulfonates reagent are formed due to the high chemical affinity between the particles and soluble lignosulfonate fractions: sprouts have an active surface of similar structure to the lignosulfonate polymer molecules of lignin and powdered lignosulfonate from identical molecules.

The high rate of formation of the filtration barrier due to the close contact between particles sprouts of barley and powdery lignosulfonates reagent enhanced through links between coagulation of colloidal complexes on the surface of these particles and globules of hydrocarbon liquid.

The rate of formation of the filtration barrier and its blocking properties measured thickness of mud cake, the amount passed through a sand filter the liquid phase with a small quantity - the depth of penetration into the sand filter.

The smaller the thickness of the crust and the filtrate passed through a sand filter, the higher the rate of formation temporarily blocking barrier, and consequently, the less filtering it into the reservoir.

The crushed particles growth is constituent of the filtration barrier, foam completely passes through the sand filter, the filter such foam through artificial core as increasing the thickness of the mud cake increases the flow resistance of the foam decreases its permeability. This provides a high pressure breakthrough foam screen, but also creates a high pressure release.

A composition that includes only powdered lignosulfonate reagent, has a relatively low rate of filtration through a sand filter is the volume of filtrate 6 mm, however, does not ensure the formation of the filtration barrier in filtering through model porous medium.

The composition comprising powdered lignosulfonate reagent in a solution of calcium chloride (none of the colloidal fraction of lignosulfonate), has no blocking properties.

And only in a complex of particle sprouts, powdered lignosulfonate reagent and the hydrocarbon globules of liquid colloidal complexes on their surface forms a dense low permeability, fine filtration barrier, which ensures the preservation of the natural permeability and is easily removed in the development process, because powdered Lin, and loose the primary grid of sprouts of barley does not offer resistance to the flow of fluids and is easily removed by dissolving powdered lignosulfonate reagent. Therefore, the pressure release composition measured for the backwash core, low, and recovery coefficient of permeability is high, which together leads to a reduction in completion time.

Thus, according to the above proposed foaming composition to achieve the claimed technical result.

The content in the composition of the foaming agent based on an aqueous solution lignosulfonates reagent in amount less than 4 wt.% not enough to create the adsorption layer of emulsifier and foaming agent. The stability of the foam obtained from such solution, low.

The content in the composition of the foaming agent based on an aqueous solution lignosulfonates reagent in more than 20 wt.% it is not economically feasible, because it happened saturation adsorption layers of emulsifier and foaming, foam stability increased slightly.

The content in the composition of diesel fuel or gas condensate in amounts of less than 12 fallopian to create a durable armored layers of globules of diesel fuel or gas condensate.

The content in the composition of diesel fuel or gas condensate in more than 31 wt.% it is not economically feasible, because the stability of the foam increases slightly after saturation armored layers of diesel fuel or gas.

Content in the mixture of shredded sprouts three-day barley and powdered lignosulfonate in an amount less than 3 wt.% and the ratio of wt. hours less than 1:0,5, respectively, are insufficient to provide the necessary blocking properties and stability of the foam system.

Content in the mixture of shredded sprouts three-day barley and powdered lignosulfonate in an amount more than 10 wt.% and the ratio of wt. including more than 1:2 leads to a decrease of the coefficient of restitution of the core permeability.

The content in the composition of the aqueous solution of calcium chloride density less than 1120 kg/m3not enough for colloidal vysalivaniya lignosulfonate, which reduces the stability of the foam and its blocking properties.

The content in the composition of the aqueous solution of calcium chloride by weight > 1280 kg/m3it is impractical, because it leads to the decomposition of the solution and the appearance of solid hour the drilling mud processing of corn-based ethanol - barley modifier as a final use gomathy and/or lignosulfonate reagent to improve the efficiency of the extrusion process by reducing the temperature of the working bodies of the extruder with a simultaneous improvement of consumer properties of the reagent-stabilizer (see patent USSR 1814652 from 15.11.91, CL 09 To 7/02, publ. in ABOUT 17, 1993); hydrolysis of barley sprouts in a solution of alkali to increase the static shear stress while simultaneously reducing the cost of drilling mud (see and.with. 941390 from 23.10.80, CL 09 To 7/02, publ. in ABOUT 25, 1982); using barley as the cereal in the reagent composition for drilling fluids to increase the efficiency of the reagent while expanding the raw material base for the preparation of the reagent, improve its appearance and increase the stability of the structural-mechanical properties of the treated drilling fluids (see RF patent 2127295 from 06.05.98, CL 09 To 7/02, publ. at ABOUT 7, 1999).

Not detected for existing sources known technical solutions, which have characteristics that match with the distinctive features of the present invention according to the claimed technical result.

The inventive composition has inventive ="ptx2">

Example 1.

To prepare 200 g of a foaming composition to 35.4 ml of an aqueous solution kssb-2 (=1130 kg/m3), which amounts to 20 wt.%, poured 82,7 ml of gas condensate (=750 kg/m3), which is 31 wt.%, 76,7 ml of an aqueous solution of calcium chloride (=1200 kg/m3), which amounts to 46 wt.%, then injected a mixture of 4.0 g of shredded sprouts three barley (2.0 wt.%) and 2.0 g of powdered lignosa (1.0 wt.%). Moreover, the ratio between the shredded sprouts three-day barley and powdery of lignosa wt. h 1:0,5 respectively. Mix, the composition of the froth on mixere "Voronezh". The blocking properties of the foam is determined on the sand filter and model of a porous medium (see Shmel'kov C. E., Kozlov N. B. Eismont E. A. Methods of research bridging ability fillers. // Construction of gas and gas condensate wells: Sat.scient.articles research Institute of gas. - 1995, - S. 14).

Study of the process of forming filtrational barrier is performed on the device, which is a camera - diameter 43,8 mm, height - 100 mm

The camera is placed 60 g of sand particle size distribution of 0.14-0,315 and 0,315-0,63 mm in a ratio of 1:1, over which pour 125 ml of foam.

After creating pressure in kairomone filtration barrier) thickness of mud cake, the volume of filtrate, fully passed through a sand filter, or the depth of its penetration into the sand filter.

Pressure breakthrough foam screen is the maximum pressure it can withstand blocked by the core, and the pressure release was determined on a model porous medium. The foam is loaded into the separation tank and with the press of a high pressure pump in the artificial sample core diameter of 25 mm and a length of 86 mm Separation capacity again fill with foam and connect with a model porous medium. Create a pressure drop, the maximum withstand foam system, and in this condition is left on 24 hours

The pressure at this time maintain a constant, somewhat less pressure filtration.

Foamable composition has the following properties: foam - 3.0, sustainability - 5184/cm3the thickness of mud cake - 1.5 mm, the volume of filtrate that has passed through a sand filter, - 3.0 mm, full penetration of the filtrate in a sand filter, pressure breakthrough foam screen is 18.7 MPa, pressure release - 0,10 MPa, the coefficient of restitution permeability to 0.97.

The Ottoman-Kugultinsky well North Stavropol UGS

Original data:

Empresaria pipe tubing is 2.5" (73 mm) - -

The depth of the descent tubing - 1180 m

Reservoir pressure is 3 MPa

Reservoir temperature, T - 304 TO

The temperature at the mouth, Ty- 286 TO

According to the rules of security operations in wells bottom hole pressure (P3in the stilling well should be less than the formation pressure (PPL) to 20% (see safety Rules in oil and gas industry, M., 1998.)

P3=1,2 PPL=1,23=3,6 MPa.

1) Determine the amount of foamable composition, necessary for the preparation of foam from the calculation, to the post in the hole conditions have created a pressure of 0.5-0.7 from the reservoir by the formula

< / BR>
where q is the volume of one running meter of wellbore, m3;

V3- the volume of the sump, m3;

g - free fall acceleration, m/s2;

pic- density foam structure.

2) Determine the amount of squeezing (buffer) liquids for injection into the tubing and annulus to prevent overflow of foam:

for pipe space

< / BR>
where q1volume one linear metre of pipe space, m3;

- casing annulus:

< / BR>
where q2volume one linear metre is m3) Kssb-2, 700 l (=1200 kg/m3) of calcium chloride.

3) Determine the necessary degree of aeration of the foam in the standards. srvc. (0the formula

< / BR>
where is the degree of aeration of the foam in downhole conditions (or=1.5-2);

Z and Z0is the coefficient of sverkhlineinoi gas phase of the foam in the hole and N. W.;

T and T0- normal and downhole temperature, K;

TOp- coefficient taking into account the properties of the foam;

p0- the pressure at the N. W. MPa.

4) Calculate the mode of operation of the unit. The desired density of the foam at a given degree of aeration of the foam (0and pressure injection foam R is determined by the table of distribution of density of the foam in the wellbore".

For operations plugging wells define the required number of components and prepare 1 m3foaming composition: 200 l of lignosulfonate kssb-2 (=1,130 kg/m3) (a 19.6 wt.%), 600 l of calcium chloride (= 1,200 kg/m3) (62,3 wt. %), 200 l of gas condensate (= 750 kg/m3) (13,0 wt. %), a mixture of 30 kg of shredded sprouts three-day barley and 30 kg of powdery kssb-2 (5.2 wt.%). Jamming is performed with the use of cementing unit CA-400, compressor SD-101 and ejector EGG-WITH-4.5. Well not less than the current downhole parameters.

Before jamming produce binding ejector: the output of the ejector through the station cementing control is connected to the pipe (tube) space, entrance through the check valve to the cementing unit and the suction chamber of the ejector through the check valve to the compressor.

Connectors are pressed at a pressure of one and a half times the expected working.

Pipe and the annular space installing the gauges.

Produces killing the well at an open gate valve on the pipe (tube) space, through the ejector pump foamable composition with filler (blocking fluid) in the estimated volume Vpicwhile applying gas to the ejector.

The mode of injection of the foamable composition and gas through the ejector is defined by calculation of the optimum degree of aeration of the foam system ().

When the pressure in the tube (pipe) space it reduce by releasing gas into the atmosphere to values (0,3-0,5) PPL.

After injection of the settlement amount the SETTLEMENT turned into foam, the gas flow to the ejector stop and upload buffer fluid (liquid produce) newspaerreuters on the annulus.

In the annulus is pumped buffer (squeezing) the fluid in the volume Vother well.satr.

The well cover and leave on sucks for 10-12 hours.

Before carrying out of works on capital repair of wells is the drain "gas cap".

Then make the dismantling of the x-Mas tree, tubing is taking and the work according to the plan of repairs for a given well.

After repair work is undertaken by exploration wells.

Develop well after the killing of the proposed structure is within 1.5-2 hours, less than the usual 5-8 hours, and testing of wells on the torch - 3 days, less than the usual 12 days.

Example 2.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution kssb-2 40/20 (use of 35.4 ml =kg/m3).

Gas condensate 62/31 (use 82,7 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery of lignosa 6/3 (using 3.0 g (1.5 wt.%) sprouts of barley and 3.0 g (1.5 wt.%) lignosa to ensure a ratio of 1:1,0).

An aqueous solution of chloride 92/46 calcium (use 76,7 ml =1200 kg is et the following indicators: the ratio of the foam - 3,0, sustainability - 5760/cm3the thickness of mud cake - 1.0 mm, the volume of filtrate that has passed through a sand filter, and 2.0 ml, full penetration of the filtrate in a sand filter, pressure breakthrough foam screen - 16.0 MPa, pressure release - 0.09 MPa, the coefficient of restitution coefficient - 0,98.

Example 3.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution kssb-2 40/20 (use of 35.4 ml =1130 kg/m3).

Gas condensate 62/31 (use 82,7 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery of lignosa 6/3 (using 2.0 g (1.0 wt.%) sprouts of barley and 4.0 g (2.0 wt.%) lignosa to ensure a ratio of 1:2,0).

An aqueous solution of calcium chloride 2/46 (use 76,7 ml =1200 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following characteristics: foam - 3.1 sustainability - 5082/cm3the thickness of mud cake 1,0 mm, the volume of filtrate that has passed through a sand filter, - 1.0 ml, full penetration of the filtrate in a sand filter, pressure breakthrough foam screen - of 15.2 MPa, pressure release - 0.09 MPa, the coefficient of restitution is the solution kssb-4 8/4 (use of 7.1 ml =1130 kg/m3).

Diesel fuel 24/12 (use of 28.2 ml =850 kg/m3).

A mixture of shredded sprouts three-day barley and powdery of lignosa kssb-2 20/10 (use 13,33 g in (6.67 wt.%) sprouts of barley and 6.67 g of 3.33 wt.%) Kssb-2 to ensure a ratio of 1:0,5).

An aqueous solution of chloride 148/74 (use 115,6 ml =1280 calcium kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following characteristics: foam - 3.1 sustainability - 12343/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in the sand filter of 8 mm, pressure breakthrough foam screen to 43.1 MPa, pressure release - 0,40 MPa, the coefficient of restitution permeability - 0,94.

Example 5.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution kssb-4 8/4 (use of 7.1 ml =1130 kg/m3).

Diesel fuel 24/12 (use of 28.2 ml =850 kg/m3).

A mixture of shredded sprouts three-day barley and powdery kssb-2 20/10 (using 10 g (5 wt.%) sprouts of barley and 10 g (5 wt.%) Kssb-2 to ensure a ratio of 1:1,0).

An aqueous solution of chloride 148/74 (use asaudi composition has the following characteristics: foam - 3.2, sustainability - 12000/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in the sand filter of 6 mm, pressure breakthrough foam screen is 37.2 MPa, pressure release - 0.35 MPa, the coefficient of restitution permeability of 0.95.

Example 6.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution kssb-4 8/4 (use of 7.1 ml =1130 kg/m3).

Diesel fuel 24/12 (use of 28.2 ml =850 kg/m3).

A mixture of shredded sprouts of barley and powdery kssb-2 20/10 (use of 6.66 g of 3.33 wt.%) sprouts of barley and 13,34 g in (6.67 wt.%) Kssb-2 to ensure a ratio of 1:2,0).

An aqueous solution of chloride 148/74 (use 115,6 ml calcium =1280 kg/m3).

Perform all operations as described in example 1. Foamable composition has the following characteristics: foam - 3,3, sustainability - 12000/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter 7 mm, pressure breakthrough foam screen is 34.0 MPa, pressure release - 0,30 MPa, the coefficient of restitution coefficient - 0,96.

Example 7.

Prepare 200 g proobrazom savy condensate 50/25 (use 66,7 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery kssb-4 12/6 (8 g (4 wt.%) sprouts of barley and 4 g (2 wt.%) Kssb-4 to ensure a ratio of 1: 0,5). An aqueous solution of chloride 110/55 (use 90,2 ml calcium =1220 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3,3, sustainability - 7855/cm3the film, the volume of filtrate that has passed through the sand core is 0, the depth of penetration of the filtrate in a sand filter (13 mm, pressure breakthrough foam screen - 33,2 MPa, pressure release - 0.24 MPa, the coefficient of restitution permeability to 0.97.

Example 8.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution of lignosa 28/14 (use of 24.8 ml =1130 kg/m3).

Gas condensate 50/25 (use 66,7 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery kssb-4 12/6 (using 6 g (3 wt.%) sprouts of barley and 6 g (3 wt.%) Kssb-4 to ensure a ratio of 1:1,0).

An aqueous solution of chloride 110/55 (use 90,2 ml calcium =1220 kg/m3).

Perform all operations as described in example 1.

eat filtrate, passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter 11 mm, pressure breakthrough foam screen - 30,0 MPa, the pressure release of 0.20 MPa, the coefficient of restitution permeability to 0.97.

Example 9.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution of lignosa 28/14 (use of 24.8 ml =1130 kg/m3).

Gas condensate 50/25 (use 66,7 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery kssb-4 12/6 (use 4 g (2 wt.%) sprouts of barley and 8 g (4 wt.%) Kssb-4 to ensure a ratio of 1:2,0).

An aqueous solution of calcium chloride 110/55 (use 90,2 ml =1220 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3,4, sustainability - 7200/cm3the film, the volume of filtrate that has passed through the sand core is 0, the depth of penetration of the filtrate in a sand filter is 10 mm, the pressure breakthrough foam screen - 26,0 MPa, the pressure release of 0.20 MPa, the coefficient of restitution coefficient - 0,98.

Example 10.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution>).

A mixture of shredded sprouts three-day barley and powdery FHSL 16/8 (use 10,67 g (5,33 wt.%) sprouts of barley and 5,33 g (to 2.67 wt.%) FHSL to ensure a ratio of 1:0,5)).

An aqueous solution of calcium chloride 152/76 (use 135,7 ml =1220 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3.0, sustainability - 10800/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter is 10 mm, the pressure breakthrough foam screen to 39.4 MPa, pressure release - 0,40 MPa, the coefficient of restitution permeability of 0.95.

Example 11.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution lsls 8/4 (use of 7.1 ml =1130 kg/m3).

Diesel fuel 24/12 (use of 28.2 ml =850 kg/m3).

A mixture of shredded sprouts three-day barley and powdery FHSL 16/8 (use 8 g (4 wt.%) sprouts of barley and 8 g (4 wt.%) FHSL to ensure a ratio of 1:1,0)).

An aqueous solution of calcium chloride 152/76 (use 135,7 ml =1220 kg/m3).

Perform all operations as specified is 64 with a/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter 9 mm, pressure breakthrough foam screen - 34,5 MPa, pressure release - 0,30 MPa, the coefficient of restitution coefficient - 0,96.

Example 12.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution lsls 8/4 (use of 7.1 ml =1130 kg/m3).

Diesel fuel 24/12 (use of 28.2 ml =850 kg/m3).

A mixture of shredded sprouts three-day barley and powdery FHSL 16/8 (use 5,33 g (to 2.67 wt.%) sprouts of barley and 10,67 g (5,33 wt.%) FHSL to ensure a ratio of 1:2,0).

An aqueous solution of calcium chloride 152/76 (use 135,7 ml =1220 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3.1 sustainability - 9600/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in the sand filter of 8 mm, pressure breakthrough foam screen - by 31.0 MPa, pressure release to 0.28 MPa, the coefficient of restitution permeability to 0.97.

Example 13.

Prepare 200 g of a foaming composition is Sant 30/15 (use 40,0 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery lsls 10/5 (used to 6.67 g of 3.33 wt.%) sprouts of barley and 3.33 g (1,67 wt.%) Lsls to ensure a ratio of 1:0,5).

An aqueous solution of calcium chloride 132/76 (use 105,6 ml =1250 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3.2, sustainability - 6171/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in the sand filter 14 mm, pressure breakthrough foam screen - 26,0 MPa, pressure release - 0,30 MPa, the coefficient of restitution permeability to 0.97.

Example 14.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution FHSL 28/14 (use of 24.8 ml =1130 kg/m3).

Gas condensant 30/15 (use 40,0 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery lsls 10/5 (using 5.0 g (2.5 wt.%) sprouts of barley and 5.0 g (2.5 wt.%) Lsls to ensure a ratio of 1:1,0).

An aqueous solution of calcium chloride 132/66 (use 105,6 ml =1250 kg/m3).

Perform all operations, as the decree is 5760/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter of 12 mm, the pressure breakthrough foam screen - 22.5 MPa, the pressure release of 0.20 MPa, the coefficient of restitution permeability to 0.97.

Example 15.

Prepare 200 g of a foaming composition, g/wt.%:

An aqueous solution FHSL 28/14 (use of 24.8 ml =1130 kg/m3).

Gas condensant 30/15 (use 40,0 ml =750 kg/m3).

A mixture of shredded sprouts three-day barley and powdery lsls 10/5 (use 1,67 g (to 3.33 wt.%) sprouts of barley and 3.33 g in (6.67 wt.%) Lsls to ensure a ratio of 1:2,0).

An aqueous solution of calcium chloride 132/66 (use 105,6 ml =1250 kg/m3).

Perform all operations as described in example 1.

Foamable composition has the following properties: foam - 3.2, sustainability - 5400/cm3the film, the volume of filtrate that has passed through a sand filter, is 0, the depth of penetration of the filtrate in a sand filter of 12 mm, the pressure breakthrough foam screen - 20.0 MPa, pressure release to 0.18 MPa, the coefficient of restitution coefficient - 0,98.

1. Foamable composition for killing wells, sostoyatelnoy fluid, solid phase - filler plant origin and the aqueous phase is an aqueous solution of calcium chloride, characterized in that it contains as specified filler blend of shredded sprouts three of barley with the powdery lignosulfonates reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes, the ratio, by weight. hours of 1:0.5 to 2.0, respectively, and an aqueous solution of calcium chloride density 1120-1280 kg/m3in the following ratio of ingredients, wt.%:

The specified foam - 4-20

Hydrocarbon liquid - 12-31

The specified mix - 3-10

This solution of calcium chloride - Rest

2. Foamable composition under item 1, characterized in that, as specified foaming agent contains a reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferrochromolignosulfonat, lignes, in the form of an aqueous solution density 1130 kg/m3.

 

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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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