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Method for gasification fracturing of liquid nitrogen in hydrocarbon reservoirs

A technology of oil and gas reservoirs and nitrogen, which is applied in coal gasification, earthwork drilling, mining fluids, etc., can solve problems such as not meeting the process requirements, achieve the effect of not being limited by water resources, realizing large-scale fracturing, and having no environmental pollution

Inactive Publication Date: 2012-06-13
YANSHAN UNIV
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  • Description
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Problems solved by technology

High-energy gas fracturing does not have the problem of hydration expansion, but it can only treat the near-well area, which does not meet the process requirements

Method used

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  • Method for gasification fracturing of liquid nitrogen in hydrocarbon reservoirs
  • Method for gasification fracturing of liquid nitrogen in hydrocarbon reservoirs

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Experimental program
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Embodiment Construction

[0012] exist figure 1 In the schematic diagram of the liquefied nitrogen gasification and fracturing method shown in the oil and gas layer, a double-layer heat-insulated oil pipe 2 is inserted into the casing 1 driven into the underground oil-gas layer 3, and the two packers in the heat-insulated oil pipe 4 Openings are provided on the left and right sides of the middle part, and a number of holes 5 are oiled with perforating guns on the casing, and liquefied nitrogen gas 7 is pressed from the ground into the cracks in the formation through the heat-insulated oil pipe and the holes injected. Close the well or stew the well on the ground or underground. The liquefied nitrogen absorbs heat and gasifies in the formation, the pressure of the fluid in the fracture increases, the temperature of the rock decreases, the volume shrinks, and the fracture expands. until the formation returns to its original temperature. To prevent fracture closure, proppants can be added to the liquefi...

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Abstract

A method for gasification fracturing of liquid nitrogen in hydrocarbon reservoirs is mainly characterized in that a heat-insulation oil pipe is inserted in a casing punctured in an underground hydrocarbon reservoir, openings are respectively arranged on the left and the right of the middles of two packers in the heat-insulation oil pipe, a plurality of holes are drilled on the casing by a perforating gun, and the liquid nitrogen which is used as fracturing liquid is pumped into cracks of a stratum via the heat-insulation oil pipe and the perforated holes. Shut-in and soaking are realized on the ground or under the ground. The liquid nitrogen absorbs heat and is gasified in the stratum, the pressure of fluid in the cracks is increased, the temperature and the volume of rocks are reduced, and the cracks are expanded until the temperature of the stratum recovers to the original temperature. The problem of hydration and expansion of clay is avoided, air outlet holes are not easy to be blocked, the method is not limited by water resources, environmental pollution is avoided, and large-scale fracturing can be realized. The method is most suitable for development of shale gas, coal bed gas, tight sandstone gas and low-permeability reservoirs.

Description

technical field [0001] The invention relates to oil and gas field exploitation technology. Background technique [0002] For oil and gas reservoirs with low permeability, it is generally necessary to increase the permeability through fracturing. The most widely used fracturing method is hydraulic fracturing, followed by high-energy gas fracturing. [0003] Hydraulic fracturing involves injecting high-pressure water into a formation to create fractures in the formation and using proppants to prevent the fractures from closing. Hydraulic fracturing works well in oil and gas formations such as sandstone and limestone. In shale, mudstone and coal seams, because the rocks contain a large amount of clay minerals, when the clay minerals meet water, they will hydrate and expand, which will easily block the cracks that have been opened, and the production stimulation effect is not good. In addition, in water-scarce areas, hydraulic fracturing that consumes a lot of water, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/295
Inventor 李子丰
Owner YANSHAN UNIV
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