Method for operation of gas-condensate deposit

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

EFFECT: higher productiveness.

2 cl, 3 ex, 6 tbl, 2 dwg

 

The invention relates to the field of development of gas condensate fields and can be used to increase the productivity of producing wells at a later stage in the operation field to maintain reservoir pressure, in terms of loss of hydrocarbon condensate in the bottom hole zone of the extraction wells.

In the process of field development in the critical zone of production wells inevitably formed crater depression pressure due to the filtration resistance of the rock collector of oil and gas. The reduction of pressure in the rich gas-condensate system, moving to the bottom of wells, leads to loss of hydrocarbon condensate, the emergence of two-phase flow of gas-condensate mixture and consequently to a sharp reduction in well productivity, particularly under low reservoir permeability.

Known methods of operating gas condensate field lies in the fact that the Buryats operational and injection wells, perforined them at the level of the reservoir, master production well by carrying out a complex of works on call flow of formation fluids, examine them on gazokondensatnoe and produce gas and condensate mixture, applying different methods of stimulation. For example, through on letatelnyy well carry out the injection of the displacing agents to promote the formation of gas-condensate mixture through the pore space of rocks - reservoirs of oil and gas production wells and maintaining reservoir pressure above the pressure at which condensation mixture (Karnaukhov M.A., Ryazantsev NF Reference test wells. M.: Nedra, 1984. - 268 S.; instructions for a comprehensive investigation of gas and gas condensate reservoirs and wells. Edited Gasimova, Sisalana. M.: Nedra, 1980, 301 S.)

However, the known methods to maintain the current reservoir pressure above the pressure at which condensation of the hydrocarbon system at a later stage in the operation of the Deposit is almost impossible for technical and economic reasons, and further exploitation mode depletion leads to the accumulation of condensate on the bottom and in the bottom hole zone of the extraction wells until they turn off when the gas flow rate becomes below the lower limit for stable ejection of liquid.

There are also known ways to develop gas condensate fields, whereby to increase componentace have pumped into the reservoir drained natural gas (patent RF №2018639, IPC 7 E 21 In 43/18, publ. 30.08.94, BI No. 16) or gas enriched mixtures of ethane, propane and butane in the liquid or gaseous state (Perepelkina SCI and other Increase componentace oil and gas condensate fields. Review details. Niigaam, ser.: anasie scientific and technical problems of the gas industry, 1986, No. 6, 48 S.).

However, these methods are not efficient enough, because require the use of complex of technical means for re-injection into the reservoir of compressed gas and large financial costs.

There is a method of development of gas condensate field, providing support in the bottomhole formation zone of high concentration hydrocarbon, C5+to improve componentace wells (RF patent No. 2029857 IPC 7 E 21 In 43/18, publ. 27.02.95, BI No. 6).

However, the scope of application of this method is limited: the method is applicable only in the early period of development of gas condensate field, when the initial reservoir pressure is still considerably higher than the dew point pressure “iriatai” reservoir system.

Closest to the claimed technical essence and the achieved result is a way to develop gas condensate field, including the exploration wells on gazokondensatnoe and periodic cleaning of the bottom-hole zone of the production well from the drop-down hydrocarbon condensate by sequential stop wells for injection into the reservoir of solvent hydrocarbon condensate, aging well at the period of dissolution of the condensate and then removing the resulting solution from the bottom zone at start-up of wells with bottom-hole zone of the well is first pumped solvent removal from the surface of collector adsorption film of hydrocarbon condensate, then reagent hydrophilization rocks, HDPE-108 based on block copolymers of ethylene oxides and propylene in a 1%solution in methanol or water (Kondrat P.M., Y. Marchuk, Petricek B.C. productivity of gas condensate wells in the conditions of retrograde condensation of the hydrocarbon mixture. Proceedings of the international conference on the development of gas condensate fields. Section 4. Technology of production of natural gas and condensate. Krasnodar, 29.05-2.06.1990,, p.63-66).

The authors of this method believe that, as in the hydrophilic porous medium reservoir hydrocarbon condensate (as hydrophobic liquid) will occupy the Central part of the pore, which have the least resistance, as a result of hydrophilization porous medium will increase permeability for condensate and decreases the condensate saturation in the bottomhole zone of the formation.

However, laboratory tests reagents-water-wetting agents that were treated samples collectors, previously washed in extraction apparatus and then saturated hydrocarbon condensate from the Orenburg oil and gas condensate field (OGCM), showed a low efficiency of the method. This is because hydrophilicity porous medium leads to a narrowing of the micropores of the newly created adsorbs the traditional layer of reagent-hydrophilization and as a consequence, a significant reduction in the rate of filtration of gas-condensate mixture. In addition, the hydrocarbon solvent used according to the method, may not be removed completely from the surface gatavodama breed adsorption film fallen hydrocarbon condensate due to identity their component compositions, and methanol and water are used as solvent reagent-hydrophilization, have only limited solubility in the hydrocarbon condensate.

The claimed invention solves the problem of improving the operational performance of gas-condensate wells due to more complete removal of the adsorption film fallen hydrocarbon condensate from the pore space and restore the permeability of bottom-hole zone of the well.

The task according to the proposed method of operating a gas condensate field, including the exploration wells on gazokondensatnoe and periodic cleaning of the well bottom-hole zone from the drop-down hydrocarbon condensate by injection of solvent extracts of wells for the period of dissolution of the condensate and then removing the resulting solution from the bottom zone at start-up of wells, is solved due to the fact that as the hydrocarbon solvent is about condensate using a binary mixture with unlimited mutual solubility of the components, moreover, at least one of them has unlimited mutual solubility with the hydrocarbon condensate, and the optimal ratio of the components of the binary mixture determine of pre-constructed phase diagram of a three-component system formed by dissolving the hydrocarbon condensate.

Another distinctive feature of the proposed method is that in a binary mixture with unlimited mutual solubility of the components use a mixture of acetone and methanol, or chloroform and methanol, or chloroform, and aniline, or chloroform and acetone.

Distinctive features of the proposed method are the following:

- use as a solvent of hydrocarbon condensation of a binary mixture with unlimited mutual solubility of the components;

- use as at least one of the components of a binary mixture of compounds having unlimited mutual solubility with the hydrocarbon condensate;

- determination of the optimal ratio of the components of the binary mixture of pre-constructed phase diagram of a three-component system formed by dissolving the hydrocarbon condensate. The quantitative ratio of the components of the binary mixture is determined in each specific case, so that the figurative stocktonontees formed by dissolving hydrocarbon condensate three-component system was located mainly in the single-phase region of the phase diagram, that facilitates thorough cleaning of the bottomhole zone.

According to the invention as binary mixtures used these paired solvents, such as acetone - methanol, chloroform - methanol, chloroform - aniline and chloroform - acetone with unlimited mutual solubility of the components capable of dissolving the precipitated hydrocarbon condensate with the formation of three-component system. When selecting and experimental study of the components of the pair of the solvent is taken into account not only the properties of their unlimited mutual solubility, mutual solubility of at least one of the components in the hydrocarbon condensate, but also the relative availability for use in field conditions. For example, in the case of a binary mixture of acetone - methanol technical acetone has the property unlimited mutual solubility both in terms of methanol and hydrocarbon condensate. In addition, methanol and acetone have the absorptive capacity for water which may be present in the wellbore area watering condensate well as a third phase. The methanol in the composition of the binary mixture shows the quality of hydrate inhibitor.

The technical result is obtained by using as a solvent of hydrocarbon is about condensation of binary mixtures with unlimited mutual solubility of the components and unlimited mutual solubility, at least one of them with the hydrocarbon condensate is to provide virtually complete removal of the adsorbed film rock of hydrocarbons due to flowing into the formation processes of dissolution of condensate and reverse evaporation part when exposed to binary mixtures, which leads to the restoration of the permeability of bottom-hole zone of the well.

The technical result obtained from the determination of the ratio of components in a binary mixture of pre-constructed phase diagram of a three-component system formed by dissolving the hydrocarbon condensate is possible qualitative and quantitative selection of the components of the binary mixture in the ratio optimum for the conditions of this field, in particular, for a given composition of the fallen hydrocarbon condensate.

The authors experimentally determined dynamics of transfer processes (represented in figure 1), occurring inside the pores with the fallen hydrocarbon condensate in the processing of bottom-hole formation zone of a binary mixture, for example, methanol - acetone with the formation of three-component system. In fact, it pseudocercosporella the system, since the hydrocarbon condensate is a multicomponent system of substances of different classes. State And reflects the original ravnovesie is between the gas phase 1 and loose hydrocarbon condensate (UCMJ) 2 under the current temperature conditions inside the reservoir without pressure maintenance, when the content of the accumulated liquid phase reaches 1/4 own volume of pores. This state of dynamic equilibrium between evaporation and condensation is characterized by the equality between the saturation pressure of the liquid phase (Ps) and the dew point pressure (RNA, dew point) of the gas phase. The next state reflects In violation of thermodynamic equilibrium when downloading a binary mixture with the formation of three-component system 3 methanol - acetone - UVC with a diffuse boundary with ottenstein condensate. Because the injected binary mixture does not contain dissolved gas, the gas deficit in the resulting three-component system and mass transfer through a diffuse boundary lead to a sharp decrease of the saturation pressure Ps of the liquid phase precipitated condensate and the violation of the established equilibrium. This, in turn, causes a decrease in the pressure at which condensation of the gas phase RNA and reverse the evaporation part of the precipitated condensate in the period of ageing well. Finally, the state characterizes the new equilibrium gas remaining in the pore condensation before putting the well and discharge formed pseudoterminal mixture of bottomhole flowing formation fluid.

The method is as follows. To clean the bottom zone gas wells (with registered lower average de is ITA) from the fall of the hydrocarbon condensate her stop and have conducted complex investigations of the removal, processing and interpretation of the recovery curves pressure (HPC) with the aim of setting filter coefficients of resistance and permeability of the reservoir to the bottomhole zone treatment. Properties of a complex system obtained by contacting the hydrocarbon condensate with a binary mixture, consider using a triangular diagram j. Gibbs. To determine the ratio of the components of the binary mixture solvent of hydrocarbon condensate in the laboratory receive the data needed to construct a phase diagram of a ternary system. The resulting chart allows to predict the phase behavior of the ternary system formed by mixing various concentrations of binary mixtures with hydrocarbon condensate. To determine the optimal quantities of the components of the binary mixture determine of predominantly single-phase region of the phase diagram figurative points of components of the obtained three-component system and the corresponding values of the components of the binary mixture. This is followed by the injection of a binary mixture in amounts and in a ratio of components defined in accordance with the above. Then hold the shutter speed well within 3-5 days for the complete dissolution of precipitated hydrocarbon condensate. Naib is more likely when uploading binary mixture solvent hydrocarbon condensate in the bottomhole formation zone appears first piston pushing a certain amount of precipitated condensate into formation with simultaneous erosion and dissolution of supporting binary mixture adsorption film of liquid hydrocarbons from the surface of rocks. After the complete destruction of the adsorption film of hydrocarbons previously pushed the condensate at start-up of the well is taken out of critical area, already occupied by a binary mixture, in the form of a single-phase three-component system. After starting well and complete removal of the resulting solution from the bottom zone, repeat the set of studies on the measurement of the coefficients of filtration resistance and permeability of the reservoir, measure the new production of the well. To change the specified rates and increased well production assess the efficacy of treatment and continue the extraction of gas condensate mixture to a new decline in well productivity.

Example 1.

Figure 2 presents the experimentally obtained phase diagram of the mixture of hydrocarbon condensate (UCMJ) - methanol (CH3IT) - acetone (CH3-CO-CH3), which can be called pseudocercosporella, because the top of the triangle UVC meets the individual component, three-component system which we (as methanol or acetone), and a complex mixture of paraffinic, naphthenic and aromatic hydrocarbons.

To get the chart in the laboratory prepared 4 binary mixture UVC Orenburg gas condensate field (ogcm) - acetone with increasing concentrations of acetone, 10, 20, 30 and 40 wt.%, which were then titrated with methanol, and 7 of binary mixtures of methanol - acetone with increasing concentrations of acetone 10, 20, 30, 40, 50, 60 and 70 wt.%, which were titrated UCMJ (see table 1). All experiments were performed at a temperature of 20°C. To build the diagram shown in the figure was calculated content in the three-component mixture of a condensate of acetone and methanol at the time of the phase transition (i.e. the appearance of a second liquid phase) flow of ions and the composition of the original binary mixtures No. 2-5 and 7-13. Experiments 1-th and 6-th - without acetone.

Position bendalloy curve, bounding from above the shaded two-phase region of the phase diagram (figure 2)show that any binary mixture of a condensate of acetone and methanol - acetone have unlimited mutual solubility of the components, while the UCMJ ogcm and methanol have limited mutual solubility: according to experimental data of table 1 at the reference temperature of 20°dissolved in methanol 18.7% of the UCMJ, and in the condensate to 11.2% methanol by weight of the binary mixture. Experimental the chart allows us to predict the phase behavior of all complex systems, formed by mixing various concentrations of binary mixtures of methanol - acetone with the UCMJ. So, if you add the UCMJ to a binary mixture of methanol - acetone, containing only 7 wt.% acetone (in the diagram, the composition of the single-phase three-component system is changed lines 1-UVC), then at the moment of appearance in the three-component system in the second phase, the concentration of the condensate will be 20 wt.%, and if the same condensate add to binary mixtures with increasing concentrations of acetone, respectively, 25, 37, and 64 wt.% (in the diagram, the compositions of the single-phase three-component systems will vary along the lines of, respectively, 2-UVK, 3-UVK, 4-UVC), their ability to dissolve the UCMJ increases to concentrations in the three-component system of 22.5%, 27.0% of the unlimited (∞).

Table 1
No. mixturesConcentric. acetone in binares, wt.%The consumption of titrant 2 ml of a binary mixture, mlThe content in the three-component system at the moment of phase transition
 cond.-acetonethe methanol.-acetonemethanolcondensatecondensateacetone methanol
     g%g%g%
10-0,22-1,406and 88.8000,17811,2
210-0,18-1,28081,70,1429,10,1459,2
320-0,26-1,15169,8in 0.288of 17.50,210a 12.7
430-0,40-1,01957,30,43724,60,32318,1
540-0,88-0,88340,50,58927,00,71032,5
6-0-0,530,37218,7001,61481,3
7- 10-0,600,42220,80,1617,91,45071,3
8-20-0,760,53424,90,32215,01,28660,1
9-30-0,820,57726,40,48222,11,12351,5
10-40-1,020,71730,90,64127,60,96141,5
11-50-2,001,40646,80.800 to26,60,79926,6
12-60-3,802,67162,60,95822,40,63815,0
13-70-7,305,13276,31,11516,60,4787,1

Table 2 shows the physico-chemical properties of the original bi is ary mixtures of methanol - acetone No. 1-4 with unlimited solubility of the components and their ability to dissolve the UCMJ to the concentration in the three-component system, shown in column 6. The coefficient of kinematic viscosity of binary solutions is defined as the standard temperature of 20°and at reservoir 32°C.

Table 2
No. BINAR mixtureThe content of acetone in binan. Mixture, wt.%Density at 20°C, g/cm3The coefficient of kinematic viscosity, mm2/sThe ability to dissolve the UCMJ to the concentration in the three-component system, wt.%
   when the standard t 20°Cat reservoir 32 t°C 
17.00.8060.860.7420.0
2250.8030.770.6622.5
3370.8010.730.6227.0
4640.7980.700.61

As can be seen from table 2, the increase of concentration of the acetone in the original binary mixtures No. 1-3 from 7 to 25 and 37% leads to a slight change in their ability to dissolve the hydrocarbon condensate from 20 to 22.5 and 27%, therefore, in case of shortage of acetone to practical application preferably is recommended binary blend # 1. Binary mixture No. 4 with the concentration of acetone 64 wt.%, capable of dissolving the UCMJ to unlimited concentration in the three-component system (see figure 2: line 4-UVC does not intersect vindaloo curve, and is only tangent to it), is not only of theoretical interest, but also enters into the region of the high success of processing, i.e., complete removal of the bottom-hole formation zone of the adsorption film fallen hydrocarbon condensate. The application of the second component (methanol) in the composition of the binary mixture is dictated not only by cost considerations and its ability to suppress the process of hydrate formation, but also the ability to control the properties of the obtained three-component system.

Example 2.

In the laboratory received the same data for the binary mixtures of aniline - chloroform (table 3) and methanol - chloroform (table 4), physico-chemical properties which are listed in table 5.

Table 3
No. mixturesThe concentration of chloroform in the binary mixture, wt.%The consumption of titrant 2 ml of a binary mixture, mlThe content of trahk nonintel system at the moment of phase transition
 condens.- chloroformAniline-chloroformanilinecondensatecondensatechloroformaniline
     g%g%g%
10-0,30-1,40682,080,0000,000.30717.92
210-0,40-1,33670,570,1487,820.40921.61
320-0,60-amount of 1, 25857,550,31514,410.61328.04
430-1,10-1,17141,860,50217.951.12440.19
540-2,20-1,07126,560,714 2.24855.74
6 0-0,450,31613,390,0000,002.04486.61
7-10-0,620,43617,120,2118,281.90074.60
8-20-1,140,80126,840,43614,611.74758.55

%
Table 4
No. mixturesThe concentration of chloroform in the binary mixture, wt.%The consumption of titrant 2 ml of a binary mixture, mlThe content in the three-component system at the moment of phase transition
 condens.-chloroformmethanol-chloroformmethanolcondensatecondensatechloroformmethanol
     gg%g%
110-0.10-1.33685.40.1489.50.0815.1
220-0.15-1.25874.30.31518.60.1217.1
330-0.20-1.17163.80.50227.40.1618.8
440-0.80-1.07144.10.71429.40.64626.5
5-10-0.640.45021.00.1697.9Of 1.52371.1
6-20-0.800.56224.00.35615.21.42260.8
7-30-1.400.98434.40.56219.7 45.9
8-40-1.501.05534.80.79226.11.18739.1
9-50-2.601.82846.61.04926.71.04926.7
10-60-3.602.53153.11.33928.10.89318.8
11-70-4.703.30458.11.66929.30.71512.6

Table 5
Binary mixtureThe content of chloroform in a binary mixture, wt.%Density at 20°C, g/mlThe coefficient of kinematic viscosity l (mm /sec)The ability to dissolve the UCMJ to the concentration in the three-component system, wt.%
   At 20°At 35° 
12 3456
Methanol-chloroform250.9800.880.7230
Methanol-chloroform501.1520.860.6945
Methanol-chloroform781.3460.840.6600
Aniline-chloroform151.0933.212.1520
Aniline-chloroform251.1412.691.7629
Aniline-chloroform331.1792.341.6300

As can be seen from table 5, by increasing the concentration of chloroform in the original binary mixtures of methanol - chloroform and aniline - chloroform to 78 and 33 wt.% accordingly, the ability to dissolve the UCMJ increases to unlimited concentration in the three-component system that will allow you to achieve complete removal of the bottom-hole formation zone of the adsorption film fallen hydrocarbon condensate.

Example 3.

Conducted field tests of the proposed method. Gas well ogcm No. 14018 and 14038 stopped and conducted complex research solatium, the processing and interpretation of the ARCS with the aim of setting filter coefficients of the resistance of a and b from equation flow of gas to the bottom of the borehole, and the coefficient of permeability k before and after treatment wells.

To handle these wells used a binary mixture of acetone - methanol with a concentration of acetone, respectively, and 22.7 24.6 wt.%, you had been preparing on the gas field and brought to the tested well on cars-kislotnykh filled container of respectively 6 and 6.5 m3. The results are entered in the table of operational control trials (table 6):

Table 6
IndicatorsWell 14018Well 14038
The source gas production, m3/day160000170000
Factors before treatment: filtration resistance, a filtration resistance, b permeability, k13,687

0,0137

11,17
22,795

0,0048

8,20
Processing date07.12.2001,04.12.2001,
The duration of exposure wells3 days3 days
Factors after treatment: filtration the first resistance, and filtration resistance, b permeability, k10,183

0,0258

15,00
16,484

-0,062

11,33
The flow rate after the treatment, m3/day180000192000
% increase of the initial rate12,512,9

Thus, when field testing the inventive method increases the initial rate of gas wells ogcm No. 14018 and 14038 were respectively 12.5 and 12.9%. A positive effect on both wells, instrumental confirmed by geophysical methods.

The calculated profit, resulting from the intensification of these wells, according to the help implementing enterprise - GPU 000 Orenburggazprom amounted 2303 rubles a payback period of 0.05 years.

The advantage of the proposed method in comparison with the prototype is the possibility of a more complete removal of fallen hydrocarbon condensate from the bottom-hole formation zone and the increase due to this the performance of gas-condensate wells.

1. A method of operating a gas condensate field, including the exploration wells on gazokondensatnoe and periodic cleaning of the well bottom-hole zone from the drop-down hydrocarbon condensate by injection into the reservoir R is storytale hydrocarbon condensate, aging well at the period of dissolution of the condensate and then removing the resulting solution from the bottom zone at start-up of wells, wherein the solvent of the hydrocarbon condensate using a binary mixture with unlimited mutual solubility of the components, and at least one of them has unlimited mutual solubility with the hydrocarbon condensate, and the ratio of the components in the binary mixture determine of pre-constructed phase diagram of a three-component system formed by dissolving the hydrocarbon condensate.

2. The method according to claim 1, characterized in that as a binary mixture with unlimited mutual solubility of the components use a mixture of acetone and methanol, or chloroform and methanol, or chloroform, and aniline, or chloroform and acetone.



 

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SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

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