Method of gas-saturated oil stabilisation

FIELD: oil and gas production.

SUBSTANCE: invention relates to stabilisation of gas-saturated oil. Proposed method comprises two-stage separation at 20-80°C with separation of gas at 1st separation stage at 0.11-0.16 MPa. It comprises also separation of degassed oil at 2nd separation stage at 0.01-0.06 MPa to obtain separated oil and gas. Separated gas is sucked off by degassing device, for example, ejector operated on associated gas from oil field separation stage. Here, extracted gas is mixed with 1st separation stage gas. Produced gas mix is cut in stable condensate and dry gas. Then, stable condensate is mixed with separated oil to feed stabilised oil and dry gas to consuming equipment.

EFFECT: higher yield of separator oil.

3 ex, 1 tbl

 

The invention relates to methods of stabilizing dehydrated and desalted gas-saturated oil and can be used in the oil industry, in particular in the fields or head pumping stations.

Known method of stabilizing the desalted crude oil by distillation in the stabilization column at an elevated pressure to get the gas head and VAT residue and evaporation of the latter in the tank at a pressure lower than the pressure in the column with subsequent condensation, heating it and return in the form of steam irrigation in the bottom of the column [Copyright certificate №652017, CL C10G 7/00, publ. 05.03.79. Bull. No. 9].

The disadvantage of this method is low efficiency of the process, namely low yield crude product as a result of significant loss of light hydrocarbon fractions.

Closest to the claimed is the method of stabilization of gas-saturated oil, including heating oil, hot separation, fractionation condensation of the resulting gas residue while hot separation and fractionation condensation is carried out at 80-120°C and a pressure of 0.3 to 0.5 MPa. The process is carried out as follows. Previously dehydrated and desalted oil, past the fishing stage of separation at 0.7 and 0.4 MPa, take the pump and the gas-saturated condition is fed through a heat e is manic in the oven and the separator, associated with a fractionation condenser, operating at a pressure of 0.3-0.5 MPa and a temperature of 80-120°C. From the separator enters a stable oil and fractionation of the condenser, the gas and condensate (NGL). Stable oil pump through the heat exchangers is fed into the tanks of commercial products. Gas from the fractionation of the capacitor goes to GPP or other consumers, and the resulting condensate return in commodity oil [Copyright certificate №1587059, CL C10G 7/00, publ. 23.08.90. Bull. No. 31].

The disadvantage of this method is not a high yield of crude product as a result of significant entrainment of light fractions of oil together with gas and LPG, as well as significant costs of electricity, due to the need of pre-heating the oil, carrying out the separation at 80-120°C, and conduct stabilization at high pressure is 0.3 - 0.5 MPa.

The method is also characterized by an increased consumption of heat, because fractionation condensation also conducted at 80-120C.

The disadvantage of this method is the high intensity of the process and, as a consequence, significant capital costs, due to the presence of a significant number of pumps, furnaces and heat exchangers, and their use leads to additional costs of electricity.

The technical result is an increase in the yield of crude product, snizeni the loss of oil due to the return oil of stable gas condensate, containing light fraction, as well as reduce energy consumption and metal consumption.

This technical result is achieved by the fact that in the proposed method, the stabilization of gas-saturated oil, including separation of oil from gas and its subsequent fractionation with the release of condensate and gas, the peculiarity lies in the fact that the stabilization of oil conducted a two-stage separation at a temperature of 20-80°C With separation of gas on the I-th stage of separation at a pressure of 0.11 to 0.16 MPa and subsequent separation of degassed oil on the II stage of separation at a pressure of 0.01 to 0.06 MPa with obtaining the separated oil and gas, sucked vacuum creating device, such as an ejector, a work agent which is associated gas field separation stage, then this gas is mixed with gas separated in the first separation stage, the obtained gas mixture is separated by fractionation of stable gas condensate and dry gas, then a stable condensate is mixed with the separated oil obtained stabilized oil and dry gas is sent to the consumer.

Conducting oil stabilization by a two-stage separation at a temperature of 20-80°C and the pressure at the I-th stage of separation 0,11-0,16 MPa (abs), i.e. above atmospheric, helps to reduce the loss of oil fractions with gases separat is due to the preservation of hydrocarbons With 4+potential components of oil.

Separation of degassed oil on the II stage of separation at a temperature of 20-80°C and a pressure of 0.01 to 0.06 MPa (abs), i.e. below atmospheric, promotes deeper oil stabilization.

Conducting a two-stage oil stabilization at the above pressures in each stage provides the opportunity for stabilization at a lower temperature - 20-80°C and also ensures the preservation of a significant amount of light fractions in the separated oil.

Use as a working agent vacuum creating device - associated gas from the oil-gathering stage of separation - reduces energy costs for carrying out the process of stabilization.

The method consists in the following.

Dehydrated and desalted oil vyngayakhinskoe field, past the fishing stage of separation in the gas-saturated condition serves to stabilize conducted a two-stage separation at 20-80°C With separation of gas on the I-th stage of separation at a pressure of 0.11 to 0.16 MPa (abs) and the subsequent separation of degassed oil on the II stage of separation at a pressure of 0.01 to 0.06 MPa (abs) to give the separated oil and gas, sucked vacuumsystem device such as an ejector, a work agent which assessability gas field separation stage. The gas separated in the separation stage, is mixed with the gas separated in the first separation stage. The obtained gas mixture is separated by fractionation of stable gas condensate and dry gas, then a stable condensate is mixed with the separated oil obtained stabilized oil and dry gas is sent to the consumer.

The method is as follows.

Example 1

Dehydrated and desalted oil, past the fishing separation stage, in quantities of 1000 t/h pick up pump in the gas-saturated condition serves to stabilize conducted a two-stage separation at a temperature of 20°C With a gas station on the I-th stage of separation at a pressure of 0.11 MPa (abs), while the gas-liquid mixture is separated into the I-th stage at a given pressure with the release of degassed oil and gas. Degassed oil is subjected to further separation in the second separation stage at a pressure of 0.01 MPa to obtain the separated oil and gas. The selected gas is sucked off vacuum creating device, such as an ejector, a work agent which is associated gas from the oil-gathering stage of separation. Then the selected gas is mixed with the gas of the first stage of separation. The obtained gas mixture is separated by fractionation of stable gas condensate and dry gas. Next stable mixed condensate is separated from the oil, the obtained stabilized oil and dry gas is sent to the consumer. The output of the stabilized oil in the above-mentioned conditions for stabilization is 992, t/h, and the vapor pressure of the stabilized oil is stored in a normalized level of 66.7 kPa.

Example 2. Analogously to example 1 carried out a two-stage separation at 40°C With separation of gas on the I-th stage of separation at a pressure of 0.14 MPa (abs). Separation of degassed oil to the second separation stage is carried out at a pressure of 0.04 MPa to obtain the separated oil and gas. The output of the stabilized oil in the above-mentioned conditions for stabilization is 975,30 t/h, and the vapor pressure of the stabilized oil is stored in a normalized level of 66.7 kPa.

Example 3. Analogously to example 1 carried out a two-stage separation at a temperature of 80°C With separation of gas on the I-th stage of separation at a pressure of 0.16 MPa (abs). Separation of degassed oil to the second separation stage is carried out at a pressure of 0.06 MPa with obtaining the separated oil and gas. The output of the stabilized oil in the above-mentioned conditions for stabilization is 987,0 t/h, and the vapor pressure of the stabilized oil is stored in a normalized level of 66.7 kPa.

In table summarizes the process parameters and the offer simple and well known methods.

Table
№ p/pOptionsIndicators for the method
Prototype A.S. 1587059The proposed methodIndicators %
in %Note
1.The amount of gas-saturated oil, t/h10001000100
2.The output of the stabilized crude oil, t/h - average958,10988,103
3.Pressure stabilization MPa (abs), on the I-th stage of separation0,3-0,50,11-0,16The reduction of pressure stabilization 2-4 times
4.Pressure stabilization MPa abs), at the second stage of separation0,01-0,06
5.Stabilized temperature, °C80-120°C20-80°CReducing the temperature of 40-60°C
6.Operating (energy) costs, MJ10,3Use the energy of the gas pressure field separation stageReduced costs 3 times
7.Capital investments, RUB10,2Reducing capex 5 times.

During the process of stabilization of lower operating (energy) costs of the proposed stabilization at a lower pressure and temperature, as well as through the use of working agent - associated gas field separation stage.

The capital cost of the proposed stabilization decline by about 5 times C is eliminating the cost of construction, the manufacture and operation of furnaces, pumps and heat exchangers.

The present invention finds industrial application in the oil industry, in particular on Vyngayahinskoy oil field.

The method of stabilization of gas-saturated oil, including separation of oil from gas and its subsequent fractionation with the release of condensate and gas, characterized in that the stabilization of oil conducted a two-stage separation at a temperature of 20-80°C With separation of gas on the I-th stage of separation at a pressure of 0.11 to 0.16 MPa and subsequent separation of degassed oil on the II-nd stage of separation at a pressure of 0.01 to 0.06 MPa with obtaining the separated oil and gas, sucked vacuum creating device, such as an ejector, a work agent which is associated gas field separation stage, the selected gas is mixed with gas I the second stage of separation, the obtained gas mixture is separated by fractionation of stable gas condensate and dry gas, then a stable condensate is mixed with the separated oil obtained stabilized oil and dry gas is sent to the consumer.



 

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