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Thermo-chemical oil extraction method of offshore thickened oil

A thermochemical and heavy oil technology, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems such as the effect of the auxiliary chemical agent is greatly affected, the boiler occupies a large space, and the environment is sensitive. Achieve the effects of low price, low investment and maintenance costs, and low activation temperature

Active Publication Date: 2014-12-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at all the thermochemical oil recovery technologies for heavy oil, the current heat supply is mostly steam as the thermal fluid, and the lower temperature has a greater impact on the effect of auxiliary chemical agents, and the process also has harsh equipment requirements, high energy consumption for generating steam, and boilers occupying Due to issues such as large ground space, high heat loss, and sensitivity to environmental impacts, it is often difficult to implement technology for oil fields with large well depths, limited space or load bearing, and obvious impacts from climatic conditions. The effect of the two working together in different temperature regions

Method used

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  • Thermo-chemical oil extraction method of offshore thickened oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, offshore heavy oil thermochemical oil recovery

[0023] use figure 1 The flow shown is for offshore heavy oil thermochemical recovery.

[0024] Install a heat exchanger at the outlet of the tail of the internal combustion engine in an oilfield site (the heat exchange efficiency is calculated as 80%), and the high-temperature exhaust gas is 165,000 m 3 / d meter, adjust the flow rate of water in the heat exchanger to 8.5m 3 / h, using the high-temperature exhaust gas of the internal combustion engine to heat the injection water temperature online to 150°C, at this time, the pressure in the heat exchanger is 6.40MPa; use 4-1 / 2″ vacuum insulation oil pipe, control single well injection water at 7m 3The flow rate of / h is injected into the heavy oil reservoir, and the temperature of the injected water near the wellbore at the 1000m reservoir can still be kept above 140°C. The heavy oil coming out of the oil production line is separated by high-efficiency sepa...

Embodiment 2

[0025] Embodiment 2, offshore heavy oil thermochemical oil recovery

[0026] use figure 1 The flow shown is for offshore heavy oil thermochemical recovery.

[0027] Install a heat exchanger at the outlet of the turbine generator tail in an oilfield site (the heat exchange efficiency is calculated as 80%), and the high-temperature exhaust gas is 165,000 m 3 / d meter, adjust the flow rate of water in the heat exchanger to 8.5m 3 / h, using the high-temperature tail gas of the turbine generator to heat the injection water temperature online to 150°C, at this time, the pressure in the heat exchanger is 6.40MPa; use 4-1 / 2″ vacuum insulation oil pipe to control single well injection water at 7m 3 The flow rate of / h is injected into the heavy oil reservoir, and the temperature of the injected water near the wellbore at the 1000m reservoir can still be kept above 140°C. The heavy oil coming out of the oil production line is separated by high-efficiency separator oil-water sediment...

Embodiment 3

[0028] Embodiment 3, offshore heavy oil thermochemical oil recovery

[0029] use figure 1 The flow shown is for offshore heavy oil thermochemical recovery.

[0030] Install a heat exchanger (calculated as 80% of the heat transfer efficiency) at the outlet of the associated gas exhausted in an oil field, and the associated gas drained by the oil field is 12,000 m 3 / d meter, adjust the flow rate of water in the heat exchanger to 20.8m 3 / h, using waste heat from oilfield evacuation of associated gas to heat the injected water online to 200°C, at this time, the pressure inside the heat exchanger is 6.40MPa; use 4-1 / 2″ vacuum insulation tubing to control single well injection water at 7m 3 The flow rate of / h is injected into the heavy oil reservoir, and the temperature of the injected water near the wellbore at the 1000m reservoir can still be kept above 190°C. The heavy oil coming out of the oil production line is separated by high-efficiency separator oil-water sedimentati...

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Abstract

The invention discloses a thermo-chemical oil extraction method of offshore thickened oil. The method comprises the following steps of: heating water injected into a heat exchanger to 150-200 DEG C by utilizing high-temperature tail gas or combustion waste heat; then, carrying a surfactant on line by the injected water; injecting a catalyst solution into a section plug; and injecting the surfactant and the catalyst solution into a thickened oil layer to carry out chemically reinforced heat oil displacement. The method disclosed by the invention takes full advantages of local conditions, recycles the waste heat and saves energy; the temperature of the injected water is raised on line to realize low-temperature heat water oil displacement; the conditions are more alleviated (compared with the traditional thickened oil thermo-chemical oil extraction by injecting steam); and the investment cost and the maintenance cost are lower and the energy-saving and synergistic offshore thermo-chemical oil displacement can be realized.

Description

technical field [0001] The invention relates to a method for recovering heavy oil at sea, in particular to a method for thermochemically recovering heavy oil at sea. Background technique [0002] There are abundant oil and gas resources in my country's sea areas, and the efficient development of offshore oil fields is becoming more and more important to national economic development and national security. With the continuous development of offshore oilfields, the types of oilfields to be put into production are becoming more and more complex, and the contradictions exposed in the production oilfields are gradually increasing. In order to develop more reserves and produce more crude oil during the life of offshore platforms, enhanced oil recovery technology plays an increasingly important role in offshore oilfield development. The geological reserves of heavy oil in my country's offshore oilfields have been found to account for about 70% of the total geological reserves, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/24
Inventor 崔盈贤向问陶张健杨光赵文森
Owner CHINA NAT OFFSHORE OIL CORP
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