The method of determining the water factor gas field

 

The invention relates to the field of oil and gas industry and can be used in the development of gas fields. To improve the accuracy and efficiency determination of water gas field. The inventive method enables the collection brought from the well bottom and the condensation of water separation from the gas stream and mixing it into the separator and determine the total mineralization of water. Collection submitted plantar and condensation water produced from all wells zone selection gas field. Then take samples separated and mixed plantar and condensation of water and conduct chemical analysis on the total mineralization on the basis of which determine the material balance for mineralization by solving mathematical equations. Then by the formulas calculate the amount of bottom water in the gas field from the condition that the condensation water formation conditions is in the form of steam. Then determine the specific quantity of condensation water on the gas field. Then determine the total number of plantar and the total amount of the condensation of water per day. On the basis of the received danshou mineralization selected from the input separators water samples can quickly determine the average specific quantity of plantar and condensation of water on the gas field, as well as the total amount of water per day on gas Providence. 1 table, 1 Il.

The invention relates to the field of oil and gas industry and can be used in the development of gas fields.

The known method of determination of water according to chemical analysis carried out from well water and calculate the number of plantar, condensation and technogenic water in every production gas wells [1. RF patent № 2128280 from 27.03.99].

The disadvantage of this method is the necessity of sampling the liquid in each well, followed by the irreversible loss of gas and pollution, the need for costly chemical analyses to determine the content of sodium ions, potassium and calcium. In addition, the definition of water gas field as the algebraic sum of the water factors in each well gives distorted results due to the condensation and accumulation of water in low areas of gas network at low gas velocities, and Vice versa, due to the removal of water from these areas at high gas velocities. When the results of research on each well of the necessary processing of large amounts of source is the main factor gas field on the input separators by regulation (reset) of the liquid from the separators, in which the liquid from all wells gas field is separated from the gas stream in the separator and collected in special containers, when the level of a mixture of carbonated liquids and solids certain value, is reset by summing the number of discharges per day and knowing the volume of the contents, determine the water factor gas field [2. Gvozdev bpts, Gritsenko, A. I., Cornelius A. E. Operation of gas and gas condensate fields.- M.: Nedra, 1988, S. 282].

The disadvantage of this method is not sufficiently accurate ways of measuring the amount of water, the thump of hands in the separators, as in the tank accumulates carbonated liquid and solids. In addition, measurements of the amount of water separators in the input time-consuming and require a considerable investment of time.

Currently, the major natural gas fields (Urengoy, Yamburg, bear, Komsomol, vyngapurovskoe) are operated in a period of declining production, which is accompanied by the introduction of bottom water in the gas portion of the reservoir. The consequence of this is the presence of fluid in the production wells, which is connected with the pulling of the plantar water in the gas portion of the reservoir and condensing paroquet the need to determine the number of plantar and condensation of water on the gas field.

Due to increased removal of water, the following problems occur:

- increase the corrosion of the internal surfaces of piping and equipment gas fields;

- increasing the load on the liquid moisture on the input separators;

- the ingress of water to the booster compressor station and, consequently, deposition of salts in the flowing part of the blowers.

The objective of the proposed solution is the definition of the middle unit and the total number of plantar and condensation of water in production wells in the area of the selection gas field.

The technical result is achieved by using the results of chemical analysis of water in the total mineralization in the input separators for determination of the proposed system of equations of the medium-specific and total number of plantar and condensation of water in production wells in the area of the selection gas field.

The purpose of the invention is improving the accuracy and timeliness determination of water gas field.

This goal is achieved by the fact that in the proposed method of determination of water gas field, including the collection brought from the well bottom and the condensation of water separation from the gas putational produce water from all wells in the zone of selection gas field, then take samples separated and mixed plantar and condensation of water and conduct chemical analysis on the total mineralization on the basis of which determine the material balance for mineralization by solving the equation:

,

where M1 - salinity bottom water, g/m3constant rate for deposits;

X1 - the amount of bottom water, g/m3;

M2 - condensation water salinity, g/m3;

X2 - the amount of condensation water, g/m3;

M3 - salinity water after mixing in the separator, g/m3;

then calculate the amount of bottom water in the gas field, taking M2 = 0, because the condensation water formation conditions is in the form of a pair of:

,

then determine the specific quantity of condensation water on the gas field by the formula:

X2 = (W-W),

where W - equilibrium moisture content of reservoir gas, g/m3;

W - equilibrium moisture content gas separators, g/m3;

when this value W and W calculated by empirically the formula used to determine the content of the vaporous flaechen systems absorption dehydration. - Tyumen: NGO "Tyumengaztechnologia", 1988, S. 17, f.2.4).

WPL=(0,457/PPL)*exp(0,0735*tPL-0,00027 t2PL)+0,041*exp(0,054*tPL-0,002*t2PL),

where PPL- formation gas pressure, kg/cm2;

TPL- reservoir temperature gas;

Wwith=(0,457/Pwith)exp(0,0735twith-0,00027t2with)+0,0418exp(0,054twith-0,002t2with),

where Pwithis the gas pressure in the separator, kg/cm2;

Twith- the temperature of the gas in the separator,;

then determine the total number of plantar and the total amount of the condensation of water per day:

Q = QX1/p,

q = QX2/to,

where: Q - the total number of bottom water, m3/day;

Q - gas flow through the inlet separators, m3/day;

X1 - the amount of bottom water, g/m3;

p - density bottom water, g/m3constant rate for deposits;

3;

it is the density of the condensation water, g/m3constant rate for deposits;

and based on the data, calculate the total amount of water gas field per day:

Q = Q + q,

where Q is the total quantity of water gas field per day, m3/day.

The invention is illustrated the concept of gas gathering gas field (drawing), where 1, 2, 3, 4, 5, 6 - well gas field, 7, 8, 9, 10, 11, 12 - lead loops, 13 - input node 14 to the inlet separator, 15 - compilation.

The method is implemented in the following way.

Gas from wells 1, 2, 3, 4, 5, 6 on the supply. 7, 8, 9, 10, 11, 12 supplied to the input node 13, and then in the inlet separator 14 which separates the reservoir gas from moisture and mechanical impurities that accumulate in the collector 15. Solids accumulate at the bottom of the collector 15 and the plantar and the condensation water is mixed. Then take samples of this mixture plantar and condensation of water and analyze it for the total mineralization. Based on the data of chemical analysis to determine material balance mineralization by the formula:

<2 - the condensation water salinity, g/m3,

M3 - salinity water after mixing in the separator, g/m3,

X1 - the amount of bottom water, g/m3,

X2 - the amount of condensation water, g/m3,

then calculate the amount of bottom water in the gas field, taking M2 = 0, because the condensation water formation conditions is in the form of a pair of:

(2),

where M1 - salinity bottom water, g/m3permanent index for a field,

M3 - salinity water after mixing in the separator, g/m3,

X2 - the amount of condensation water, g/m3,

then determine the specific quantity of condensation water on the gas field by the formula:

X2 = (W-W) (3)

where W - equilibrium moisture content of reservoir gas, g/m3

W - equilibrium moisture content gas separators, g/m3,

when this value W and W calculated by known methods [3], and then determine the total number of plantar and the total amount of the condensation of water per day:

Q = QX1/p (4),

q = Qthe total amount of the condensation water, m3/day,

Q - gas flow through the inlet separators, m3/day,

X1 - the amount of bottom water, g/m3,

X2 - the amount of condensation water, g/m3,

p - density bottom water, g/m3permanent index for a field,

it is the density of the condensation water, g/m3permanent index for a field,

and based on the data, calculate the total amount of water gas field per day:

Q = Q + q (6),

where Q is the total quantity of water gas field per day, m3/day.,

q is the total quantity of condensation water, m3/day,

Q - gas flow through the inlet separators, m3/day.

Thus, using the system of equations 1 - 6, according to chemical analysis for the total mineralization selected from the input separators water samples can quickly determine the average specific quantity of plantar and condensation of water on the gas field, and the total amount of water per day on gas Providence.

A specific example of implementation of the method.

Gas field bear 305 is operated producing wells to dividing the total amount of water the thump of hands on inlet separators for the day by fixing the number of discharges fluid from collections. In addition, it was determined the number of plantar, condensation water and their sum on the proposed settlement. When performing calculations, the density of the heel and condensation of water were taken:p = 1050K = 1000 kg/m3accordingly, the salinity of bottom water M1 = 19300 g/m3mineralization condensation water M2 = 0. The results of field studies, data and calculations are given in the table.

For example, field studies from 13.10.00 was determined the total amount of water, the thump of hands on inlet separators Q = 12.0 m3/day. According to the results of chemical analyses, it was determined that the mineralization of the water after mixing in the separator M3 = 1315 g/m3. Specific quantity of condensation water on the gas field is determined by the known method [3] by the formula X2 = (W-Wc), i.e. x22= 0,653 g/m3under the terms and conditions: equilibrium moisture content of reservoir gas W = 1.197 g/m3when the values of reservoir pressure of 4.4 MPa and temperature of 35.2 °C, the equilibrium moisture content of the gas is C input separators at the date of the study was Qg= 14640 thousand m3/day. Specific quantity of bottom water on the gas field is determined by the formulai.e. X1 = 13150,653 / (19300-1315) = 0,048. The total number of bottom water is determined by the formula Q = QX1/p, i.e. Q = 146400000,048/1050000 = 0,7. The total amount of the condensation water is determined by the formula q = QX2/K, i.e. Q = 146400000,653/1000000 = 9,6. The total number of plantar and the amount of condensation water is determined by the formula Q = Q + Q, i.e. Q = 0,7 + 9,6 = 10,3.

The difference between the total amount of water, the thump of hands on inlet separators per day (gr. 2), and the total amount of water specified on the proposed settlement (gr. 10), can be explained by the fact that when conducting field studies were recorded volume of carbonated liquids and solids under pressure separation.

Thus, the obtained data will allow us to track changes in water factor. The application of the proposed method allows to increase the accuracy of determination of water gas field, h is a V e hit mineralized water booster station and as a result, deposition of salts in the flowing part of the blowers, to take timely measures to:

- reduce the removal of bottom water;

- reduce the corrosion of the internal surfaces of piping and equipment gas fields;

- reduce the load on the liquid moisture on the input separators.

Sources of information

1. RF patent № 2128280, IPC6E 21 In 43/00, publ. 27.03.99 bull. No. 9.

2. Gvozdev bpts, Gritsenko, A. I., Cornelius A. E. Operation of gas and gas condensate fields. - M.: Nedra, 1988, S. 282 (prototype).

3. Guidelines for technological calculations of absorption dehydration. - Tyumen: NGO “Tyumengaztechnologia”, 1988, S. 17, f.2.4.

Claims

The method of determination of water gas field, including the collection brought from the well bottom and condensation of water, its separation from the gas stream, mixing it into the separator and determine the total mineralization of water, characterized in that the collection of submitted plantar and condensation water produced from all wells zone selection gas field, then take samples separated and mixed plantar and condensation of water and conduct chemical analysis for total mine) - Rev. src="https://img.russianpatents.com/img_data/68/680400.gif">

where M1 - salinity bottom water, g/m3; constant rate for deposits;

X1 - the amount of bottom water, g/m3;

M2 - condensation water salinity, g/m3;

X2 - the amount of condensation water, g/m3;

M3 - salinity water after mixing in the separator, g/m3,

then calculate the amount of bottom water in the gas field, taking M2 = 0, because the condensation water formation conditions is in the form of a pair of

then determine the specific quantity of condensation water on the gas field by the formula

X2 = (W-Wc),

where W - moisture content gas reservoir in the form of water vapor, g/m3;

W - moisture content gas separators in the form of water vapor, g/m3,

then determine the total number of plantar and the total amount of the condensation of water per day

Q = QX1/p

q = QX2/to,

where Q - the total number of bottom water, m3/day;

Q - gas flow through the inlet separators, m3/day;

X1 is the specific quantity is a constant rate for deposits;

q is the total quantity of condensation water, m3/day;

X2 - the amount of condensation water, g/m3;

it is the density of the condensation water, g/m3permanent index for a field,

and based on the data, calculate the total amount of water gas field per day

Q = Q + q,

where Q is the total quantity of water gas field per day, m3/day.

 

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FIELD: oil extractive industry.

SUBSTANCE: device includes exposure chamber, U-shaped branch pipe on it for passing of oil with picking of oil from upwards, made in form of five pipes inserted into one another with common ceiling and bottom and apertures in upper and lower portions of pipe, forming serially placed U-shaped and upturned U-shaped branch-pipe, and channel for passing of water with picking of water from downwards, having common output from device.

EFFECT: higher efficiency.

1 ex, 1 dwg

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