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Fracturing operation methods, exploitation method and exploitation system for combustible ice exploitation

A fracturing and operation technology, which is applied in the development of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems that high-strength fracturing cannot be used, and the effect of fracturing operations cannot be maintained continuously, and achieves a higher mining control range. , the effect of reducing well density and cost

Active Publication Date: 2019-10-18
威海海冰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the stratum overlying the combustible ice is thin and soft, in order to protect the strata overlying the combustible ice from damage, high-intensity fracturing operations such as shale gas exploitation cannot be used
In addition, due to the secondary freezing of combustible ice, the cracks generated by the fracturing operation are quickly filled, so that the effect of the fracturing operation cannot be retained continuously

Method used

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  • Fracturing operation methods, exploitation method and exploitation system for combustible ice exploitation
  • Fracturing operation methods, exploitation method and exploitation system for combustible ice exploitation
  • Fracturing operation methods, exploitation method and exploitation system for combustible ice exploitation

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The present invention has the best effect in horizontal branch wells. Such as Figure 4 and 5 Shown fracturing method, its fracturing steps are:

[0051] 1) Horizontally drill the production branch wellbore 16 at the position of the combustible ice reservoir 4, and horizontally drill the injection branch wellbore 17 in the pore reservoir 5 below the combustible ice reservoir 4; the production branch wellbore 16 and the injection branch A number of perforation tunnels 18 are opened in the pipeline of the wellbore 17 to release the pressure;

[0052] 2) Put the casing in the well 3, do well cementing, perforating and install the inlet device;

[0053] 3) Put the plug 19 and the booster pipe 13 down along the casing 3, and the booster tube 13 passes through the plug 19 on the path in turn and communicates with the injection branch wellbore 17; the booster tube 13 is connected to the booster pump 11 ;

[0054] The annular space between the booster pipe 13 and the casin...

Embodiment 2

[0060] Such as Figure 8 The fracturing method shown is performed in multiple wells, two wells are used as an example. Implemented between two wells, the fracturing steps are:

[0061] 1) Two left and right wells are drilled, wherein the left well is drilled to the extraction position of the combustible ice reservoir 4, and the right well is drilled to the injection position of the pore reservoir 5.

[0062] Drill a horizontal production branch wellbore 16 at the position of the combustible ice reservoir 4, and drill a horizontal injection branch wellbore 17 in the pore reservoir 5 below the combustible ice reservoir 4; the production branch wellbore 16 and the injection branch wellbore 17 pipelines are provided with a number of perforation tunnels 18 to penetrate the pressure;

[0063] 2) Place casings in the left and right wells respectively. 3. Do well cementing, perforating and installing inlet devices;

[0064] 3) Plugs 19 are installed respectively in the left and rig...

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Abstract

The invention discloses fracturing operation methods applied in a single well and a double-well, corresponding methods for exploiting natural gas and a system device used during the exploitation. Fracturing operation is carried out by pressure boosting and pressure reducing in pairs, and most of fractures finally point to a production branch wellbore through guidance of a negative pressure gradient field, which greatly reduces the damage of the fracturing operation to an overlaying formation, protects an overlaying layer of the combustible ice and is one of the guarantees for the safe exploitation of the combustible ice. An exploitation control range of the single well for the combustible ice resource is greatly increased, the output of the single well is increased, and the well distribution density is reduced. During the exploitation, pressure boosting and pressure reducing in pairs push-pull operation is also used between an injection branch wellbore and the production branch wellbore, which helps to keep a seepage channel from injection to production unblocked, prevents the fractures from secondary icing filling and maintains long-term stable exploitation of combustible ice natural gas.

Description

technical field [0001] The invention relates to energy mining technology, in particular to a method for fracturing strata by applying pressurized and depressurized paired pressure fields, and a method and system for exploiting natural gas in combustible ice formations using the fracturing method. Background technique [0002] Decompression (negative pressure) mining is to reduce the pressure in the wellbore, partially break the temperature and pressure environment where the combustible ice is stored, and melt the combustible ice. There are several factors to consider in this mining process. With the melting of combustible ice, gas is formed, and the local pressure will increase; the melting of combustible ice absorbs heat and reduces the local temperature; the local temperature and pressure environment will soon return to the range of freezing temperature and pressure conditions, causing the mining process to stop. In order to make the mining of combustible ice more sustain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/01E21B43/30
CPCE21B43/01E21B43/26E21B43/305E21B41/0099
Inventor 肖加奇
Owner 威海海冰能源科技有限公司