FR2570755A1 - New applications of scleroglucan in the field of the treatment of hydrocarbon wells as an agent for suspending solid particles or bubbles - Google Patents

Abstract

The use of polymers denoted by scleroglucan as transport agent supporting agent or strengthening agent, foam stabiliser, in the treatment of oil wells. Notable range of properties, among others: good stability to temperature and to salts.

Description

New applications of scleroglucan in the field of treatment

<tb><SEP> wells <SEP> dphrofilts <SEP> z <SEP> of <SEP> of <SEP> axions <SEP> hydrocarbons <SEP> on <SEP> dp- <SEP>inaMb; cL-nkn ---, clash <SEP> cicent
<tb> of <SEP> Imse <SEP> e <SEP> nsQ <SEP> emwaen <SEP> e <SEP> p <SEP> OLI <SEP> cz <SEP> or <SEP>;
<tb><SEP> Lalprésente <SEP> invention <SEP> concerns <SEP><SEP> uses <SEP> of a
known polymer, called scleroglucan, in a sector for which many specific properties must be reunited for the implementation in the field is successful that of oil drilling. Scleroglucan belongs to a larger family called "polyglucosylglucans".

 More specifically, the invention relates to the application of scleroglucans in viscous solution for hydrocarbon well or pipe treatment operations, to maintain or cause changes in the natural characteristics of the drainage or flow mechanisms of fluids produced by said wells or transported in said pipes, after which said scleroglucan solution is recovered after treatment of the well or pipes.

comportant un groupe ss-D-glucopyranosyle fixé en position

sensiblement tous les trois motifs le long de la chaîne principale. On trouvera sur la figure 1 annexée la représentation des motifs de structure du scléroglucane.The term "scleroglucan" refers to a class of poly
neutral saccharides composed of a linear chain of linked ss-D-glucopyranosyl units

having a ss-D-glucopyranosyl group attached in position

substantially all three patterns along the main chain. Attached FIG. 1 is a representation of the structural units of scleroglucan.

 In fact, the number of side chains as well as the length of these side chains may vary to some extent depending on the fungus used for the culture.

 For the structure of this class of products, we can usefully refer to: JOHNSON, chem. Ind. (1965) 820 and SANDFORD, Adv. Carbohydr. Chem. Biochem. 36 (1979), 265-313.

 Applications of these polymers have been previously discovered in the field of paints (US-A-3,447,940), a source of gentobiose (US-A-3,423,288), in medicine (US-A-3,415,929; No. 3,421,920) and in the field of enhanced oil recovery (US-A-4,347,146, US-A-3,372,749).

The crude oil is recovered by injecting into the formation via a well, called injection, a viscous solution, containing polymers by exeniple, to move the crude oil and recover it by a so-called production well.

 It has now been discovered according to the invention that this class of polymers can be used very advantageously in other fields of the petroleum industry, which opens up a very promising new field of application.

 All the tests whose reports are given in the present application were carried out on scleroglucan samples prepared by the company Ceca a, Vélizy, France.

This product is in the form of a white powder obtained by precipitating the culture broth with alcohol after filtration to remove the mycelium.

Rheology of scleroglucan.

The rheological curve of scleroglucan has a Newtonian plateau of low shear rate then a region in which a power law describes well the behavior
rheological; a second Newtonian plate primer is then found at a high shear rate.

The viscosity of the first plateau is very high (in
relationship with the concentration; and elastic properties of the
solution appear as sella will be specified below. From this
In fact, scleroglucan can be used as a foam stabilizer.

 First of all, remarkable stability of the properties of sclerogiucane as a function of pH up to values of 3 was noted. Appended FIG. 2 represents the curve of the viscosity as a function of the shear rate, with the pH being the parameter. The plots are identical until about pH 12, where a sudden transition takes place. This transition is not reversible. This behavior gives scleroglucan a possibility of application as an acid gelling agent.

 Currently used in this field xanthan, but with a dual limitation to 15% acid and 60-70 C temperature. The structure of the gum @anthanne is shown in FIG.

 Scleroglucan, in the same application, makes it possible to viscosify acid up to a concentration of 35% by weight, in the case of hydrochloric acid, in a temperature range of up to 600 ° C. for a concentration of 287% by weight. . Acids such as hydrofluoric acid may also be viscosified by sclerogiucane. Scleroglucan will be used in this application at a rate of 1: 2 to 12 g / l, preferably 2,4-4,8 g / l.

 Table II below gives the test reports establishing the acid-gelling properties of scleroglucan.

 The appended FIG. 3 shows the influence of the concentration of scleroglucan polymer at 27 ° C. on the viscosity curves, as a function of the shear rate. The lower the polymer concentration, the higher the Newtonian plateau appears at a high shear rate.

 The variation of the slope n 'of the viscosity curve in the region of the power law as a function of the scleroglucan polymer concentration is shown in Table I below.

dans cette expression, et y représentent respectivement la contrainte de cisaillement et le gradient de cisaillement.The power law mentioned above makes it possible to characterize the fluid used according to the following formula

in this expression, and represent respectively the shear stress and the shear gradient.

 Scleroglucan may be used as a carrier agent for proppants or consolidants (the lower the solid particle transport properties, the better). It is also possible to use scleroglucan for the injection of calibrated sand to form a natural filter (use in "gravel pack"), the gel being then broken.

 It has also been noted that the viscosity is independent of the temperature. Figures 4 and 5 appendices highlight this independence for two polymer concentrations.

This independence is verified from 150C to 132 C approximately (see Figure 6 attached). At this latter temperature, there is a clear decrease in viscosity. If the temperature is then lowered to about 300 ° C., there is a decrease of about 50% in the viscosity (see appended FIG.

 By way of comparison, a guar gum solution crosslinked with sodium borate has a limit of use of 930.degree.

 In view of the foregoing, scleroglucan may be advantageously used as a fracturing fluid.

 Scleroglucan also has an absolute independence of viscosity as a function of salinity. In particular, the viscosity curve is not modified when using seawater or a 1% KCl solution. Furthermore, the presence of divalent cations has no influence on the behavior of the solutions. of scleroglucan.

 Scleroglucan is the only fracturing fluid that does not need to be cross-linked and has good resistance to temperature, salts, and good proppant transport or consolidation properties.

 The drilling and completion fluids used by the oil companies contain salts such as sodium chloride, potassium, calcium, zinc bromide, calcium, etc., alone or as a mixture, to increase their densities without having to introduce solid particles that could damage the formations. The polymers generally used for viscosifying these fluids are cellulose derivatives such as hydroxydethyl cellulose at concentrations of up to 60 g / l or even 120 g / l (from 6 to 12% by weight). Scleroglucan viscosifies solutions of these salts to saturation, the polymer concentration being in a range from 0.6 to 12 gil (0.24 to 1.2 wt.%) of 2,4 to 7.2 gn pre-salt and then the same properties of particle transport and control of. filtration. Better still, it is not necessary to modify the pH of these brines in order to obtain good hydration of the scieroglucan, which is not the case for the cellulose derivatives. Indeed, these brines have an acid pH that inhibits the hydration of cellulose derivatives. Two methods to obtain the desired properties can be used: either increase the polymer concentration, or increase the pH of the solution to allow good hydration of the polymer . But then, an increase in pH causes a precipitation of the metal hydroxides which damages the treated formations.

 It has thus been found that scleroglucan can be used at low concentrations in highly concentrated brines without losing its viscosity, particle transport or filtration control properties, and without the risk of damaging the formation.

The base polymer for fracturing fluids is currently a hydroxypropyl guar gum
The attached FIG. 7 shows the influence of the concentration of guar gum (G) on the viscosity curve. The same viscosity for the Newtonian plateau is obtained at more than 9.6 gil (1%) instead of only 2.4 g / l (0.2%) for scleroglucan (S).

 At a concentration of 2.4 g / l, scleroglucan has a Newtonian plateau viscosity 1000 times higher than hydroxypropyl guar gum.

 In addition, the coefficient n 'is only 0s13 for scleroglucan instead of 0.65 for hydroxypropyl guar gum at 270C. The scleroglucan proppant transport properties are therefore much higher than those of the hydroxypropyl guar gum, even at high shear rates.

 Figure 8 shows the influence of temperature on the viscosity curve of hydroxypropyl guar gum (G) and scleroglucan (S).

Viscoelasticity and suspension
The properties of viscoelasticity of scleroglucan are shown in Table III below. These properties are quite remarkable. Scleroglucan is more elastic than hydroxypropyl guar gum and xanthan. As for the properties of suspending particles in a scleroglucan solution, they were determined on a solution of 4.8 g / l (0.5% by weight) of scleroglucan.

 The proppant selected for these tests was 40/60 bauxite at a concentration of 360 g / l.

 The bauxite was mixed with the polymer solution in a Waring blender for 2 minutes, and then poured into a column of circular section 50 mm in diameter and 2 m in height. After 2 h, no sedimentation was observed. After 60 h, only 20% of sedimentation of bauxite is observed.

 Other tests were performed to compare scleroglucan, hydroxypropyl guar gum and hydroxypropyl guar gum solution crosslinked with a titanium salt. At a concentration of 4 g / l, with 300 g / l of 40/60 bauxite, the proppant immediately sedimented in the guar gum solution, whereas no sedimentation of the bauxite was observed in the scleroglucan solution or in the reticulate solution.

 These outstanding suspending and transporting properties can also be advantageously used. for cleaning debris (oxidation products, deposits, water, etc.) that may be in an oil or gas pipeline.

 In use as a fracturing gel, for consolidation, or for sand injection ("gravel pack"), it is necessary to break the polymer solution to reduce its viscosity and clean the well. and its derivatives are generally broken by oxidizing agents such as persulrates, but leave solid residues which reduce the fracture permeability and hence the productivity of the well.There is shown in Table IV below the results of the tests carried out on the scleroglucan.

 The breaking agent used is ammonium pcrsulfate.

 A key advantage of scleroglucan is that it does not leave any solid residue in the fracture.

 It is also possible to break the scleroglucan solution simply by raising the pH to a value greater than 12 (see Table V below).

Filtration through training
Table VI below gives the data relating to the filtrate and relating to the solutions of scleroglucan. A comparison is given in Table VII with the filtrate properties of guar gum solutions.

Filtration tests are performed according to the standard
API RP 39 "Standard Procedures for Evaluation of Hydraulic Fracturing Fluids" under a pressure differential of 70 kg / cm 2. The volume of liquid filtered through the core is measured after 1, 4, 9, 16, 25 and 36 minutes, and is plotted against a square root of time curve. The slope of the line obtained gives access to the coefficient C (coefficient of
w loss of fluid) and the ordinate at the origin makes it possible to have access to the coefficient S ("SPURT").

 Other tests have been carried out to determine the ability of scleroglucan solutions to develop their cosity viscosity. The tests were carried out at different pHs (see Table VIII) and the highest rate of hydration was observed in acidic medium.

 It will therefore be advantageous to add an acid buffer in the scleroglucan solution in order to very quickly reach a high viscosity.

 Moreover, even under very intense stirring, during mixing, the scleroglucan solutions do not tend to foam, unlike other conventional polymers.

It is also interesting to compare scleroglucan with santhan gum, which is an anionic polysaccharide obtained by bacterial fermentation. As indicated above, the structure of the santhanum gum is shown in the attached FIG. 13. The xanthan gum produced by the company was used for the tests reported in the present application.
The properties of this gum are known as follows: a relatively stable viscosity as a function of salinity, pH, temperature and shear stresses, and exceptional suspending qualities,
The properties of the xanthan gum in this area are recalled in Figures 9 to 11 annexed and compared with those of scleroglucan in Figure 12 attached (CS = scleroglucan X = xanthane).

It is found that scleroglucan has a higher viscosity and a better value of the coefficient n ', and thus offers suspension properties even greater than those, already exceptional, xanthan gum. In addition, the rheology of scleroglucan is less dependent on temperature and pH.

Scleroglucan is also less sensitive to ions (both as regards the nature of the ions and their concentration) than xanthan gum.

 On the other hand, a scleroglucan solution shear test was carried out under 1000 s 1 for 3 hours without observing shear degradation.

 It can thus be seen from the properties stated above that scleroglucan has properties which make it suitable for use as a base fluid for the treatment of oil wells and installations, which was not suggested by the properties previously known to him. A particularly surprising aspect is that Scleroglucan has a very remarkable set of properties some of which are still superior to those of the best known agents.

 All these interesting properties of scleroglucanepmo will considerably simplify the design and implementation of treatments for oil wells or installations. Indeed, since the properties of d2 scleroglucan solutions do not vary with temperature (up to 1350), p'H, water salinite or shear (mode and history), the design of treatments, whether pipe cleaning operations, "gravel pack" or injection of viscous solutions, acidic or not, containing proppants or not, to stimulate the wells, will be ultra simplified.Es besides the operator will have the guarantee to have exactly the attenuative property, which was not always the case with other types of polymer solutions, crosslinked or not.

 Another important improvement, due to the use of this polymer, relates to the implementation. This is also extremely simple since it is no longer necessary to check and precisely adjust the pH, salinity and temperature of the mixing water.

Moreover, this product disperses easily and hydrates rapidly, so that it can be used for batch operations as well, that is, the polymer solution is prepared and stored before use, or continuous operations, that is, the solution is prepared at the same time as it is used.

 The fact that scleroglucan solutions hydrate rapidly and have properties superior to or at least equal to conventional crosslinked fluids therefore gives them a clear operational advantage, even on continuous systems with fast hydration rates (gum-based systems hydroxypropyl or non-crosslinked with borax guar and applicable up to temperatures of 100 ° C). In the case of systems that are cross-linked by metal complexes (high-temperature applications), they must be necessary: mixed intermittently and their delicate use (water quality, hydration time, control of the viscosity of the solution, control injection of the crosslinker during the treatment ...). In addition all these polymer solutions are extremely sensitive to shear.

 Since the scleroglucan solutions retain the same properties up to a temperature of 135 ° C., and the temperature of the formations to be treated can be very advantageously lowered by injection of a certain sacrificial volume of water or of a polymer solution such as gum hydroxypropylated guar or not, scleroglucan solutions can also very advantageously replace the polymer systems, crosslinked to metal ions for high temperature applications.

TABLE I

<tb> Concentration <SEP> in <SEP> Slope <SEP> n '<SEP> of <SEP> the <SEP> curve
<tb><SEP> Polymer <SEP> of <SEP> Viscosity
<tb><SEP> (g / l)
<tb><SEP> 0.6 <SEP> 0.43
<tb><SEP> 1.2 <SEP> 0.20
<tb><SEP> 1.8 <SEP> 0.13
<tb><SEP> 2.4 <SEP> 0.13
<tb><SEP> 3.6 <SEP> 0.10
<tb><SEP> 4.8 <SEP> 0.15
<Tb>
TABLE II
Properties of Scleroglucan Acid Gelling Agent (cPs viscosity)

<tb> Time <SEP> Concentration <SEP> of <SEP> Polymer <SEP> (g / 1) <SEP>
<tb> (min) <SEP> (Solvent: <SEP> water <SEP> to <SEP>
<tb><SEP> 1 <SEP> Z <SEP> Kcl)
<tb><SEP> 2.4 <SEP> 3.6 <SEP> 4.8 <SEP> 3.6
<tb><SEP> 5 <SEP> 19.8 <SEP> 27 <SEP> 33 <SEP> 28.8
<tb><SEP> 10 <SEP> 21 <SEP> 28.2 <SEP> 36 <SEP> 30.6 <SEP>
<tb><SEP> 15 <SEP> 22.2 <SEP> 30 <SEP> 38.4 <SEP> 32.1
<tb><SEP> 30 <SEP> 24 <SEP> 33 <SEP> 48 <SEP> 33.6
<tb><SEP> 60 <SEP> 24.1 <SEP> 33.0 <SEP> 47.9 <SEP> 33.6
<tb> - FANN 35 viscometer measurement, combination RI BI FO.2.

shear rate 170 - The acid used is 25% hydrochloric acid by weight - Temperature 270C TABLE III
Viscoelastic properties of scleroglucan and hydroxypropyl guar gum.

Concentration
<tb> 0.6 <SEP> 1.2 <SEP> 1.8 <SEP> 2.4 <SEP> 3.6 <SEP> 4.8 <SEP> 4.8
<tb> in <SEP> polymer
<tb> (g / 1)
<tb> Frequency <SEP> w
<tb> 0.0065 <SEP> 0.14 <SEP> 0.0065 <SEP> 0.14 <SEP> 0.0065 <SEP> 0.0065 <SEP> 0.14 <SEP> 0.0065 <SEP > 0.14 <SEP> 0.0065 <SEP> 0.14 <SEP> 0.0065 <SEP> 0.14
<tb> (Hz)
<tb>#
<tb> (degree @ s) <SEP> 72.6 <SEP> 66.6 <SEP> 72.8 <SEP> 38.5 <SEP> 42.8 <SEP> 42.0 <SEP> 16.7 <SEP> 46.9 <SEP> 16.9 <SEP> 43.2 <SEP> 20.9 <SEP> 86.4 <SE> 80.6
<tb>#'
<tb>(<SEP> mPa.s) <SEP> 125 <SEP> 77 <SEP> 1 <SEP> 820 <SEP> 260 <SEP> 4 <SEP> 450 <SEP> 13 <SEP> 100 <SEP> 650 <SEP> 25 <SEP> 500 <SEP> 9 <SEP> 900 <SEP> 43 <SEP> 100 <SEP> 3 <SEP> 100 <SEP> 435 <SEP> 350
<tb> G '<SEP> (Pa) <SEP> 1.6 <SEP> 29 <SEP> 23 <SEP> 285 <SEP> 196 <SEP> 515 <SEP> 1 <SEP> 900 <SEP> 970 <MS> 5 <SEP> 300 <SEP> 1 <SEP> 870 <SEP> 7 <SEP> 120 <SEP> 2.0 <SEP> 51
<tb>#<SEP> * (mPa.s) <SEP> 131 <SEP> 84 <SEP> 1 <SEP> 910 <SEP> 415 <SEP> 6 <SEP> 550 <SEP> 16 <SEP> 900 <MS> 2 <SEP> 250 <SEP> 34 <SEP> 900 <SEP> 3 <SEP> 400 <SEP> 62 <SEP> 900 <SEP> 8 <SEP> 670 <SEK> 440 <SEP> 355
<tb>#<SEP> (s) <SEP> 7.3 <SEP> 0.45 <SEP> 7.2 <SEP> 0.9 <SEP> 18.0 <SEP> 18.2 <SEP> 1 , 1 <SEP> 16.7 <SEP> 0.6 <SEP> 17.8 <SEP> 1.0 <SEP> 2.8 <SEP> 0.2
<tb> S <SEP> C <SEP> L <SEP> E <SEP> R <SEP> O <SEP> G <SEP> L <SEP> U <SEP> C <SEP> A <SEP> N <SEP > E <SEP> gum <SEP> guar
<tb> Notes: T = 27 C; 1% KCl; pH = 5.6 # = loss angle ## = complex viscosity # '= dynamic viscosity
G '= elastic modulus # = relaxation time
TABLE IV
Breakage of scleroglucan solutions by an oxidizing agent (viscosity in cPs)

<tb><SEP>
<tb><SEP> Concentration
<tb><SEP> in <SEP> agent <SEP> 0.012 <SEP> 0.12 <SEP> 0.24 <SEP> 0.48 <SEP> 0.6 <SEP> 1.2
<tb><SEP> Time <SEP> oxyda
<tb><SEP> (h)
<tb><SEP> 0 <SEP> 60 <SEP> 60 <SEP> 60 <SEP> 60 <SEP> 60 <SEP> 60
<tb><SEP> 3 <SEP> 57 <SEP> 57
<tb><SEP> 4 <SEP> 60 <SEP> 60
<tb><SEP> 7 <SEP> 60 <SEP> 54 <SEP> 13.8 <SEP> 4.8
<tb><SEP> 24 <SEP> 1 <SEP> 60 <SEP> 55.8 <SEP> 39 <SEP> 14.4
<tb> 48 <SEP> 1 <SEP> 58 <SEP> 54 <SEP> 4.8 <SEP> 4.2
<tb><SEP> 120 <SEP> 1 <SEP> 57 <SEP> 50.4
<Tb>
Notes: Polymer concentration: 4.8 g / l
Solvent: solution at 1 Z KC1
T = 660C
Fann viscometer measurements, combination R1 B1 F0.2
Shear rate 170 s-1
TABLE V
Breakage of a solution of scleroRlucane by a base

<tb><SEP> pH <SEP> Viscosity
<tb><SEP> cP
<tb><SEP> 5.5 <SEP> 43.2
<tb> 10 <SEP> 43.2
<tb> 11 <SEP> 43.2
<tb> 11.5 <SEP> 43.2
<tb> 12 <SEP> 37.2
<tb> 12.5 <SEP> 33.6
<tb> 12.8 <SEP> 27
<tb> 13 <SEP> 12.6
<Tb>
Notes
Polymer concentration: 3.6 g / l
Solvent: 1% solution KCl
T = 270C
Fann 35 viscometer measurements, combination R1 B1 FO.2 -1
Shear rate: 170 s
TABLE VI
FILTRATION OF SCLEROGLUCANE SOLUTIONS
Polymer concentration ~ 4.8 g / l

<tb> Permeability <SEP> T <SEP> Flour <SEP> of <SEP> S <SEP> Cw <SEP> x <SEP> 1000
<tb><SEP> (mD) <SEP> (C) <SEP> silica <SEP> (1 / m2)
<tb><SEP> (g / 1)
<tb><SEP> 10.7 <SEP> 93 <SEP> 0.42 <SEP> 25 <SEP> 8.1
<tb><SEP> 10.7 <SEP> 93 <SEP> 1.8 <SEP> 16 <SEP> 1.5
<tb><SEP> 23 <SEP> 93 <SEP> 1.8 <SEP> 30 <SEP> 3.9
<tb><SEP> 10.9 <SEP> 104 <SEP> 1.8 <SEP> 18 <SEP> 2,3
<Tb>
Polymer concentration = 3.6 g! L

<tb> Permeability <SEP> T <SEP> Flour <SEP> of <SEP> ss <SEP> S <SEP> Cw <SEP> Cw <SEP> x <SEP> 1000
<tb><SEP> (mD) <SEP> (C) <SEP> silica <SEP> (1 / m2)
<tb><SEP> (g / 1)
<tb><SEP> 11.5 <SEP> 93 <SEP> 0.42 <SEP> 18 <SEP> 8.1
<tb><SEP> 11.6 <SEP> 93 <SEP> 1.8 <SEP> 16 <SEP> 4.2
<tb><SEP> 17.5 <SEP> 93 <SEP> 1.8 <SEP> 26 <SEP> 5.0
<tb><SEP> 11.5 <SEP> 104 <SEP> 1.8 <SEP> 18 <SEP> 2.7
<Tb>
Polymer concentration = 2.4 g / l

<tb> Permeability <SEP> T <SEP> Flour <SEP> of <SEP> Cw <SEP> x <SEP> 1000 <SEP>
<tb><SEP> (mD) <SEP> (C) <SEP> silica <SEP> (1 / m2)
<tb><SEP> (g / 1)
<tb><SEP> 11.7 <SEP> 93 <SEP> 0.42 <SEP> 32 <SEP> 8.5
<tb><SEP> 11.7 <SEP> 93 <SEP> 1.8 <SEP> 14 <SEP> 7.6 <SEP>
<tb><SEP> 23.3 <SEP> 93 <SEP> 1.8 <SEP> 33 <SEP> 9.2
<tb><SEP> 11.5 <SEP> 104 <SEP> 1.8 <SEP> 25 <SEP> 10.8 <SEP>
<Tb>
Cw = Coefficient of fluid loss
S = Originally ordered ("SPURT") TABLE VII
FILTRATION
Comparison with guar gum

Permeability <SEP> T <SEP> Polymer <SEP> Concentration <SEP> Flour <SEP> of <SEP> S <SEP> Cw <SEP> x <SEP> 1000
<tb> (mD) <SEP> (C) <SEP> (g / 1) <SEP> silica <SEP> (1 / cm2)
<tb> (g / 1)
<tb> 10.7 <SEP> 93 <SEP> scleroglucan <SEP> 4.8 <SEP> 1.8 <SEP> 16 <SEP> 1.5
<tb> 5.10 <SEP> 93 <SEP> gum <SEP> guar <SEP> 4.8 <SEP> 2.4 <SEP> 7 <SEP> 2.7
<tb> Hydroxypropylated
<tb> 11.7 <SEP> 93 <SEP> scleroglucan <SEP> 2.4 <SEP> 0.42 <SEP> 32 <SEP> 8.5
<tb> 11.7 <SEP> 93 <SEP> scleroglucan <SEP> 2.4 <SEP> 1.8 <SEP> 14 <SEP> 7.6
<tb> 5-10 <SEP> 66 <SEP> gum <SEP> guar <SEP> 2,4 <SEP> 1,2 <SEP> 6 <SEP> 4,8
<tb> Hydroxypropylated
<tb> Note: Solvent: 1% KCl solution.

Cw: Coefficient of fluid drilled.

S: "SPURT" ordered at origin.

TABLE VIII
Development of the viscosity of a scleroglucan solution
at 3.6 g / 1

<tb><SEP> Hydration <SEP>: <SEP> 3 <SEP> min <SEP> at <SEP> melan <SEP> Hydration <SEP>: <SEP> 1 <SEP> min <SEP> at <SEP> mixer
<tb><SEP> geur <SEP> Waring <SEP> to <SEP> 6 <SEP> 000 <SEP> rpm <SEP> Waring <SEP> to <SEP> 6 <SEP> 000 <SEP> tr / min
<tb><SEP>#<SEP><SEP> = <SEP> 26 C <SEP>#<SEP><SEP> = <SEP> 26 C
<tb><SEP> Measurement <SEP> at <SEP> Viscometer <SEP> FANN <SEP> 35 <SEP> Measurement <SEP> at <SEP> Viscometer <SEP> FANN <SEP> 35
<tb><SEP> combination <SEP> R1 <SEP> B1 <SEP> FO.2 <SEP> combination <SEP> R1 <SEP> B1 <SEP> FO.2
<tb><SEP><SEP> Rate of <SEP> Shear: <SEP> 170 <SEP> s-1 <SEP><SEP> Rate of <SEP> Shear <SEP>: <SEP> 170
<tb> a) <SEP> 1 <SEP>% <SEP>KCl;<SEP> pH <SEP> = <SEP> 5.5 <SEP> water <SEP>: <SEP> 1 <SEP>% <SEP>KCl;<SEP> pH <SEP> = <SEP> 5.6
<tb> Time <SEP> Viscosity <SEP>% <SEP> Time <SEP> Viscosity <SEP>%
<tb> (min) <SEP> (cPs) <SEP> (min) <SEP> (cPs)
<tb><SEP> 5 <SEP> 28.8 <SEP> 70.6 <SEP> 3 <SEP> 18 <SEP> 44
<tb><SEP> 10 <SEP> 30.6 <SEP> 75 <SEP> 5 <SEP> 19.8 <SEP> 68.5
<tb><SEP> 15 <SEP> 32.1 <SEP> 78.7 <SEP> 10 <SEP> 22.8 <SEP> 56
<tb><SEP> 30 <SEP> 33.6 <SEP> 82.3 <SEP> 15 <SEP> 24.6 <SEP> 60.3
<tb><SEP> 60 <SEP> 36.6 <SEP> 89.7 <SEP> 30 <SEP> 27.6 <SEP> 67.6
<tb><SEP> 24 <SEP> h <SEP> 40.8 <SEP> 100 <SEP>% <SEP> 60 <SEP> 33.6 <SE> 82.3
<tb><SEP> 24 <SEP> h <SEP> 40.8 <SE> 100 <SEP>%
<tb> b) <SEP> water <SEP> of <SEP>sea;<SEP> pH <SEP> = <SEP> 9 <SEP> c) <SEP> hydration <SEP> 3 <SEP> min <SEP> at the <SEP> mixer
<tb> Time <SEP> Viscosity <SEP>% <SEP> Waring <SEP> 6 <SEP> 000 <SEP> RPM
<tb> (min) <SEP> (cPs)
<tb>#<SEP> = <SEP> 26 C
<tb> 5 <SEP> 27.6 <SEP> 67.6
<tb><SEP> Measurement <SEP> at <SEP> Viscometer <SEP> FANN <SEP> 35
<tb> 10 <SEP> 29.4 <SEP> 72
<tb><SEP> combination <SEP> R1 <SEP> B1 <SEP> FO.2
<tb><SEP> 15 <SEP> 30 <SEP> 73.5 <SEP> Rate <SEP> of <SEP> shear <SEP> 170
<tb><SEP> 30 <SEP> 33 <SEP> 80.9 <SEP> water <SEP>: <SEP> 1 <SEP> 7 <SEP> KCl <SEP>;<SEP> pH <SEP> = <SEP> 2
<tb><SEP> 60 <SEP> 36 <SEP> 88 <SEP> Time <SEP> Viscosity
<tb><SEP> (min) <SEP> (cPs) <SEP><SEP> Z <SEP>
<tb><SEP> 5 <SEP> 36 <SEP> 78
<tb><SEP> 10 <SEP> 40.2 <SEP> 88
<tb><SEP> 15 <SEP> 43.8 <SEP> 95
<tb><SEP> 30 <SEP> 45.6 <SEP> 100
<tb><SEP> 60 <SEP> 46 <SEP> 100
<Tb>

Claims (9)

 1. Application of scleroglucans for hydrocarbon well treatment operations, as agents for suspending solid particles or bubbles of gas or air, characterized in that an effective amount of scleroglucans in solution is introduced. viscous in well treatment fluids. 2. Application according to claim 1 characterized in that the concentration of said scleroglucans is greater than or equal to 0.06% by weight. 3. Application according to claim 1 or 2, characterized in that after treatment of the wells or pipes, said solution of steroglucans is recovered. 4. Application according to claim 3, characterized in that one breaks said solution before recovering it. 5. Application of scleroglucans according to claim 1 or 2 as foam stabilizers. 6. Application according to claim 5, characterized in that the concentration of scleroglucan polymer is between 0.6 and 12 g of polymer / 1, preferably between 2.4 and 7.2 g of polymer / l. 7. Application according to claim 6, characterized in that the concentration of scleroglucan polymer is 1.2 to 12 gll and preferably 2.4 to 4.8 g / l. 8. Application of the scleroglucans according to claim 1 or 2 as suspending agents for solid particles  9. Application according to claim 8 of sele-ro  glucans as carrier agents for proppant or sand injection agent.