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Processing technology for extracting oil from metamorphic rock high pour point oil of burial hill by using combustion drive in horizontal well

A process technology and a technology for metamorphic rock, which are applied to the field of oil production using horizontal wells in fire-flooding metamorphic rock buried hill high-point oil reservoirs, can solve the problems of difficult control of heating temperature, difficult mining technology, complicated downhole process, etc., and achieve a long-term stable combustion state , the effect of expanding geological reserves and increasing recovery

Inactive Publication Date: 2006-09-27
尤尼斯油气技术(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fire flooding oil production is carried out in fractures in high pour point oil in metamorphic rock buried hills in China. Due to the limitation of lithology, the production technology is very difficult and has not been studied. In addition, oil wells in vertical wells in homogeneous sandstone bodies Most of the ignition methods are ignited in a well by electric heating or liquefied gas and chemical methods. For example, domestic Xinjiang Oilfield and Liaohe Oilfield Majiapumiaowu Oilfield use cables to connect heaters to feed air. Since the heating temperature is not easy to control, the downhole process Complicated, easy to burn out, and the heating cable is unsuccessful. Aiming at the characteristics of Liaohe Oilfield heavy oil condensate oil with high viscosity and high freezing point, a fire-driven metamorphic rock buried hill of the present invention is proposed. There is no report on the technology of using horizontal wells to recover oil from high pour point oil

Method used

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  • Processing technology for extracting oil from metamorphic rock high pour point oil of burial hill by using combustion drive in horizontal well
  • Processing technology for extracting oil from metamorphic rock high pour point oil of burial hill by using combustion drive in horizontal well

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Embodiment 1

[0041] In Figure 1, the distribution of high pour point oil in metamorphic buried hills is described in the figure. Before fire flooding oil, it is necessary to clearly understand the physical parameters of the internal structural mechanism of buried hills through geological data, that is, the lithology of buried hills is metamorphic rocks, shallow-grained Migmatites, shallow grained rocks, etc., and distinguish the distribution zones of the rock surface, such as weathered zones, fracture development zones, and low-angle horizontal zones. In the distribution area of ​​high pour point oil, generally speaking, the ground temperature above 1000 meters in buried hill rocks is less than 45 degrees Celsius, which is called immovable oil zone 5, and the interval between 1300 and 1400 meters, where the ground temperature is about 53 degrees Celsius, is the movable oil zone 6. When deploying wells, the well pattern should be deployed in the movable oil zone 6. At the same time, the oil ...

Embodiment 2

[0043]Determine the horizontal production well 1 well position according to the geological data in embodiment 1:

[0044] The horizontal oil production well 1 is selected in the formation dip angle and the vertical micro-fracture development section, and the direction of the horizontal well section should be perpendicular to the direction of the rock fractures, so as to maximize the oil drainage area through the formation fractures.

[0045] The oil well is deep and located at a position with a ground temperature above 45 degrees Celsius. The high pour point oil at this position is in a state of natural flow in the movable oil zone 6 of the formation.

[0046] In the stratum development zone, the fracture dip angle is less than 30 degrees, which is the best horizontal well location area.

Embodiment 3

[0048] Determination of ignition wells for fire flooding (Fig. 2):

[0049] When the high pour point oil in fire-flooded metamorphic rock buried hill horizontal well 1 produces oil, in addition to drilling horizontal well 1 to produce oil, it is also necessary to drill air injection well 3 and gas production well 2 above the horizontal section of the horizontal well. Air is injected into well 3, and gas production well 2 is ventilated to form a thermal field to heat up the high pour point oil, and then it is in a stable flow state. During oil production, it is produced from oil production horizontal well 1 ( image 3 ).

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Abstract

The invention relates to a method for using horizontal well to extract oil in the fire flooding metamorphic rock burial hill high-density oil accumulation, which uses fire flooding technique and drill horizontal well on the oil of crank to extract oil. The invention can reach more than 10% of extraction rate, and it can combine the character of high-density oil and the ground temperature to process the oil extraction in vertical section. The invention has simple process and higher reliability.

Description

Technical field: [0001] The invention relates to a technology for recovering oil from a fire-driven metamorphic rock buried-hill high-condensation oil reservoir by using a horizontal well, and belongs to the fire-drive oil recovery method for mining buried-hill high-condensation oil. Background technique: [0002] The reserves of heavy oil and high pour point oil in Liaohe Oilfield account for about 60% of the total reserves, which mainly rely on steam huff and puff development. Due to the shallow burial of heavy oil blocks in some fault-block oilfields and many thin interbeds, heavy oil exploitation is in the late stage of steam huff and puff , showing the characteristics of high recovery degree, high huff and puff rounds, low formation pressure, and low huff and puff oil-gas ratio. It is difficult to obtain better economic benefits if steam huff and puff is continued. The formation pressure is 1.05MPa, and the total pressure difference reaches 9.77MPa. Now it has entered t...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 邓惠荣祝学江
Owner 尤尼斯油气技术(中国)有限公司
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