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Remaining oil cave extracting method of exhausted oil field

A technology for remaining oil and oil fields, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of low recovery factor, high comprehensive water content, oil residue, etc., and achieve the effect of improving recovery factor

Inactive Publication Date: 2013-02-13
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] At present, many major oil fields in eastern my country have become high water-cut oil fields. After primary and secondary oil recovery, only about 30% of the total underground reserves can be recovered. High degree, high oil production rate, low storage-production ratio, and low recovery rate, there are still about a lot of remaining oil remaining in the ground (Zheng Junwei et al., 2007)

Method used

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  • Remaining oil cave extracting method of exhausted oil field
  • Remaining oil cave extracting method of exhausted oil field
  • Remaining oil cave extracting method of exhausted oil field

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Embodiment approach

[0047] Such as figure 1 As shown, there is a reservoir roof buried about 500 meters and a thickness of about 50 meters in a resource-exhausted oilfield.

[0048] figure 2 It shows that the pumping operation is carried out for this reservoir, because depleted oilfields often go through a long period of secondary oil recovery (mainly water injection) and tertiary oil recovery (polymer, CO injection) 2 , hot water, etc.), the underground reservoir is rich in liquid (water or polymer, etc.). In this example, the pumping well is to utilize the original water injection well or production well of the oil field.

[0049] image 3 Explain that shafts and flat tunnels are developed, and the oil-bearing sandstone is mined by the room-and-pillar back-fill mining method commonly used in coal and metal mining, and transported to the surface dressing plant for oil-sand separation, and the mined oil-bearing sandstone is crushed and ground. After the ore dressing test, the optimum particl...

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Abstract

The invention discloses a remaining oil cave extracting method of an exhausted oil field, mainly comprising the following steps: a) draining residual liquid in a reservoir; b) developing a shaft to an oil reservoir bottom, tunneling tunnels in the oil reservoir, and mining the oil-contained sandstone in the oil reservoir by a room-pillar backfilling method; c) crushing and grinding the oil-contained sandstone, using hot water containing soda to wash oil in order to separate oil from sand; and d) performing oil refining to the separated oil, and backfilling the separated sand as tailings. The method overcomes the defects that the currently most advanced tertiary oil recovery technique cannot overcome, greatly improves the recovery efficiency of oil, reaches the recovery efficiency up to 90% above, and has great practical meaning.

Description

technical field [0001] The invention belongs to the field of mineral resource development, and in particular relates to a tunnel recovery method for remaining oil in resource-exhausted oilfield reservoirs. Background technique [0002] Petroleum resources are an important strategic resource, and enhancing oil recovery is an important issue related to a country's energy security. At present, the shortage of oil and gas resources in the world has become an important restrictive factor for economic and social development, and it is necessary to formulate and implement a sustainable development strategy for oil and gas resources. [0003] On the one hand, our country is short of oil resources, while the demand for oil is increasing year by year, and on the other hand, the oil recovery rate is not high. After the developed oilfields enter the high water-cut stage of development, as the degree of exploitation deepens, the underground oil-water relationship and the distribution of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
Inventor 梁光河
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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