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A low-corrosion chemical heat-generating pressurized gel breaker and preparation method thereof

A thermal pressurized gel breaker and thermal pressurization technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as damage to reservoirs and equipment, failure of fracturing fluid to completely break gels, etc. The effect of damage, increase of formation pressure, and improvement of flowback capacity

Inactive Publication Date: 2017-02-15
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-corrosion chemical heat-generating pressurized gel breaker, which solves the problem that the fracturing fluid encountered in the fracturing and exploitation process of the existing low-temperature and low-pressure oil field cannot completely break the gel, and the remaining acid is too weak to affect the reservoir. and equipment causing harm to the

Method used

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  • A low-corrosion chemical heat-generating pressurized gel breaker and preparation method thereof
  • A low-corrosion chemical heat-generating pressurized gel breaker and preparation method thereof

Examples

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Effect test

Embodiment 1

[0049] A method for preparing a low-corrosion chemical heat-generating pressurized gel breaker, specifically implemented according to the following steps:

[0050] Step 1, prepare agent A solution, agent B solution and activator solution

[0051] 1.1) Weigh 5kg of ammonium chloride and 1kg of ammonium persulfate, add them into 44kg of water, stir evenly, and wait until they are completely dissolved to prepare Agent A solution.

[0052] 1.2) Weigh 9kg of sodium nitrite, add it into 51kg of water, stir evenly, and wait until it is completely dissolved to prepare the B agent solution.

[0053] 1.3) Preparation of activator solution

[0054] 1.3.1) Preparation of Activator H 3 PW 12 o 40 Heteropolyacids

[0055] Weigh 10kgNa 2 WO 4 2H 2 O slightly heated and dissolved in 10kgH 2 O, then dropwise add 1L of 85% H 3 PO 4 And 7.5L 38% concentrated hydrochloric acid. After reacting for 4 hours, filter and redissolve the precipitate in 10L of water, then pour the precipitate...

Embodiment 2

[0061] A method for preparing a low-corrosion chemical heat-generating pressurized gel breaker, specifically implemented according to the following steps:

[0062] Step 1, prepare agent A solution, agent B solution and activator solution

[0063] 1.1) Weigh 7.5kg of ammonium chloride and 1.5kg of ammonium persulfate, add them into 41kg of water, stir evenly, and wait until they are completely dissolved to obtain Agent A solution.

[0064] 1.2) Weigh 12kg of sodium nitrite, add it into 48kg of water, stir evenly, and wait until it is completely dissolved to prepare the B agent solution.

[0065] 1.3) Preparation of activator solution

[0066] 1.3.1) Preparation of Activator H 3 PW 12 o 40 Heteropolyacids

[0067] Weigh 12kgNa 2 WO 4 2H 2 O slightly heated and dissolved in 12kgH 2 O, then dropwise added 1.5L of 85% H 3 PO 4 And 9.6L 38% concentrated hydrochloric acid. After reacting for 3.5 hours, filter and redissolve the precipitate in 14L of water, then pour the p...

Embodiment 3

[0073] A method for preparing a low-corrosion chemical heat-generating pressurized gel breaker, specifically implemented according to the following steps:

[0074] Step 1, prepare agent A solution, agent B solution and activator solution

[0075] 1.1) Weigh 12.5kg of ammonium chloride and 2.5kg of ammonium persulfate, add them into 35kg of water, stir evenly, and wait until they are completely dissolved to prepare Agent A solution.

[0076] 1.2) Weigh 18kg of sodium nitrite, add it into 42kg of water, stir evenly, and wait until it is completely dissolved to prepare the B agent solution.

[0077] 1.3) Preparation of activator solution

[0078] 1.3.1) Preparation of Activator H 3 PW 12 o 40 Heteropolyacids

[0079] Weigh 15kgNa 2 WO 4 2H 2 O slightly heated and dissolved in 15kgH 2 O, then dropwise add 2.25L of 85% H 3 PO 4 and 12.75L of 38% concentrated hydrochloric acid. After reacting for 4.5 hours, filter and redissolve the precipitate in 19L of water, then pour t...

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Abstract

The invention discloses a low-corrosion chemical themogenic pressurizing gel breaker which comprises an agent A solution, an agent B solution and an activator solution. The invention further discloses a preparation method of the gel breaker. The preparation method comprises the following step: uniformly mixing the agent A solution, the agent B solution and the activator solution in volume ratio of 1.0 to (1.0-1.3) to (1.0-1.2). The formation temperature is improved by the heat generated by virtue of gel breaker reaction, and the gel breaker is activated, so that a fracturing fluid is thoroughly broken. Gas generated by the gel breaking has the effect of increasing the formation pressure, so that the fracturing flowback capacity is improved. In addition, by using H3PW12O40 heteropolyacid as the activator of a system, on the basis of not affecting the acid strength, the corrosivity of the system is reduced, and the destructiveness on a soil environment in the fracturing process is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development engineering, and relates to a low-corrosion chemical heat-generating pressurized gel breaker, and also relates to a preparation method of the above gel breaker. Background technique [0002] Fracturing technology, as an effective means to improve production capacity of low-permeability oil and gas layers, has become one of the main measures to stabilize and increase production in oilfields. At present, the fracturing fluid used in field construction is mainly water-based fracturing fluid, but the water-based fracturing fluid has the problems of incomplete gel breaking, low flowback rate, and residual organic matter in the formation will cause "secondary damage" to the reservoir . Therefore, improving the low-temperature gel breaking and low-pressure flowback performance of conventional water-based fracturing fluids has become the key to improving the fracturing performance o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66
CPCC09K8/665C09K2208/26
Inventor 甄延忠付峰韩进宋诗稳王芳
Owner YANAN UNIV
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