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Gunpowder for realizing deep well deep bumming and fracturing

A technology for blasting fracturing and gunpowder, applied in the direction of explosives, etc., can solve the problems of difficult to press formation with high fracture pressure, unsuitable gas generating agent, low energy of double-base gunpowder, etc. The effect of action time and slow burn rate

Inactive Publication Date: 2015-03-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the relatively low energy and fast burning speed of the double-base gunpowder used in solid drug high-energy gas fracturing technology, it can only be adapted to conventional pressure formations not exceeding 2000m, and the fracturing range is limited to the 2m-5m zone near the wellbore. For the fracturing of deep wells and ultra-high pressure formations, it seems that there is more than enough energy and insufficient energy; and although the liquid gunpowder high-energy gas fracturing technology has a long effective burning time, due to the limitation of the formula and combustion performance, it is difficult to open the high-pressure gas when it is used alone. Fracture pressure formation, should not be used alone in deep wells, ultra-high pressure wells
Therefore, high-energy gas fracturing technology urgently needs to solve the problem that current gas generating agents are not suitable for oil and gas wells in deep and ultra-high pressure formations.

Method used

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  • Gunpowder for realizing deep well deep bumming and fracturing
  • Gunpowder for realizing deep well deep bumming and fracturing
  • Gunpowder for realizing deep well deep bumming and fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The gunpowder of this embodiment includes solid gunpowder and liquid gunpowder, the mass ratio of the solid gunpowder and liquid gunpowder is 1:10.8, and the formula composition of the solid gunpowder and the liquid gunpowder is shown in Table 1.

[0026] Table 1 The formula composition of embodiment 1 solid gunpowder and liquid gunpowder

[0027]

[0028] The preparation method of the solid gunpowder of this embodiment is as follows: weigh each raw material according to the formula composition of the solid gunpowder, place the raw materials in a mixer and mix for 80 minutes, select a mold according to the shape and size of the gunpowder column to be prepared, and then mix the powder The raw materials are vacuum casted and molded, and then placed in a 70°C oven for curing for 5 days after being pressure-preserved and degassed to obtain a solid gunpowder column. The gunpowder column is hollow cylindrical, with an inner diameter of 25mm, an outer diameter of 85mm, and a...

Embodiment 2

[0037] This embodiment is the same as embodiment 1, wherein the difference is: the binder is polyurethane, or nitrocellulose and polyurethane, and the plasticizer is one of nitroglycerin, triacetin and pentaerythritol tetranitrate Or three, or nitroglycerin and pentaerythritol tetranitrate, or triacetin and pentaerythritol tetranitrate, the oxidizer in the solid gunpowder is ammonium nitrate, or ammonium perchlorate and ammonium nitrate, and the metal burning agent is magnesium powder , or aluminum powder and magnesium powder, the high-energy additive is RDX or Octogen, the stabilizer is 2-nitrodiphenylamine, and the catalyst is copper salicylate, rysooctanoic acid cuprous or carbon black; the liquid The oxidant in the gunpowder is ammonium perchlorate, or ammonium perchlorate and ammonium nitrate, and the burning agent is one, three or four of diethylene glycol, glycerin, urea and hexamethamine, or two Two of ethylene glycol, glycerin and urotropine, or a mixture of diethylen...

Embodiment 3

[0039] The gunpowder of this embodiment includes solid gunpowder and liquid gunpowder, the mass ratio of the solid gunpowder and liquid gunpowder is 1:9.6, and the formula composition of the solid gunpowder and the liquid gunpowder is shown in Table 2.

[0040] The formula composition of table 2 embodiment 3 solid gunpowder and liquid gunpowder

[0041]

[0042] The preparation methods of the solid gunpowder and the liquid gunpowder of this embodiment are all the same as in Example 1.

[0043] The gunpowder performance of the present embodiment is detected, and the results are as follows:

[0044] Peak pressure: under the airtight explosive device, the solid powder is 178.6MPa, and the liquid powder is 129.8MPa;

[0045] Burning rate and pressure index: under the airtight detonator 6.89MPa, the burning rate of solid propellant is 8.28mm / s, the pressure index is 0.418, the burning rate of liquid propellant is 2.52mm / s, and the pressure index is 0.203;

[0046] Temperature ...

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Abstract

The invention discloses gunpowder for realizing deep well deep bumming and fracturing, the gunpowder includes solid powder and liquid powder; the solid powder comprises a binder, a plasticizer, an oxidizing agent, a metal combustion agent, a high-energy additive, a stabilizer and a catalyst; and the liquid powder comprises an oxidizing agent, a combustion agent, a performance modifier and water. The solid powder of the gunpowder can overcome the restriction of large stress difference coefficient and high fracturing pressure of deep-layer and ultra high pressure formation, a plurality of radial cracks and branched cracks are formed in a broken rock layer, main crack is preliminarily extended, the fracture pressure is reduced to help the liquid powder to continue to fracture the formation, at the same time, the role of ignition of the liquid powder is played, after the solid powder is burn out, the liquid powder continues to maintain a high pressure environment in a wellhole, and effects on the formation for longer time, the main crack length is further extended, the branched cracks are developed, natural cracks are communicated, and a complex fracture network structure is formed in a larger-range purpose layer near the wellbore.

Description

technical field [0001] The invention belongs to the technical field of high-energy gas fracturing, and in particular relates to a gunpowder capable of realizing explosive fracturing in deep wells. Background technique [0002] At present, the high-energy gas fracturing technology and its joint operation technology at home and abroad are developing rapidly, and have been successfully applied in many oil fields, and have achieved surprising benefits. The gas generating agent used in high-energy gas fracturing technology is mainly solid gunpowder, followed by liquid gunpowder. The solid propellant used in solid propellant high-energy gas fracturing is mainly double-base propellant, which is characterized by low energy and fast burning speed, which can release gas quickly, suppress pressure in the wellbore, and rupture the formation; while liquid propellant high-energy gas pressure The liquid gunpowder used in fracturing is mainly composed of ammonium nitrate and urea. It has s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/04C06B33/06C06B33/14
Inventor 吴飞鹏刘静任杨蒲春生刘洪志
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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