Fracturing inclusion self-dissolving diversion agent and preparation method thereof

A technology of diverting agent and inclusions, which is applied in the field of inclusion self-dissolving diverting agents and its preparation, which can solve the problems of large fracturing fluid fluid loss, inability to form filter cakes, and low plugging efficiency, and achieve simplification of construction operations , On-site construction is simple, and the sealing effect is strong

Inactive Publication Date: 2014-01-01
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used diverting agents are: suspension diverting agents, whose disadvantages are that it is difficult to form a large pressure difference resistance due to turbulent flow and blast hole deformation, the plugging efficiency is low, and filter cakes cannot be formed; underground cross-linking diverting agents have the disadvantages Because a small dose cannot reach the required pressure, a large dose will cause new damage. Although a filter cake can be formed, the underground reaction is unstable and cannot reach the required strength; the once-crosslinked particle diverting agent on the ground is characterized by its own strength Large, but the plugging efficiency is low, and the fracturing fluid fluid loss is large; the plugging ball diversion agent is characterized by high strength and small deformation, but it is easy to fall off, low plugging efficiency, and cannot be self-degraded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At a room temperature of 20°C, put 15g of guanidine collagen powder, 35g of ferric chloride, 35g of aluminum oxide, 2g of sodium bicarbonate and 2g of potassium ferricyanide in 200ml of water and stir evenly, and continue stirring to mix the slurry for 5 minutes. Afterwards, put the slurry in a drying oven at 100°C for 40 minutes to obtain agglomerated materials, and use a pulverizer to crush them into 40-50 μm powders, and then spray them at the inlet of the fluidized granulator. 1g of γ-aminopropyltriethoxysilane coupling agent is attached to the surface of 10g ammonium persulfate crystal particles of 40~60 mesh, and then the crystal particles attached to the coupling agent are fully contacted with the powder by convection, so that the powder adheres Spherical particles are formed on the surface of the crystal particles, and finally dried to obtain the diverting agent in the form of inner wrapping, with a particle size of 20 mesh.

[0023] The guanidine collagen powd...

Embodiment 2

[0025] At a room temperature of 20°C, put 15g of guanidine collagen powder, 40g of ferric chloride, 32g of aluminum oxide, 1g of sodium bicarbonate and 2g of potassium ferricyanide in 200ml of water and stir evenly, and continue stirring to mix the slurry for 5 minutes. Then put the slurry in a drying oven at 100°C and dry for 30 minutes to obtain agglomerated materials, which are crushed into 40-50 μm powder by a pulverizer, and then sprayed at the inlet of the fluidized granulator 1g γ-aminopropyltriethoxysilane coupling agent is attached to the surface of 9g ammonium persulfate crystal particles of 40~60 mesh, and then the particles and powder are fully contacted by convection, so that the powder adheres to the crystal surface, and finally dried Ready to prepare.

Embodiment 3

[0027] At a room temperature of 20°C, put 15g of guanidine collagen powder, 32g of ferric chloride, 40g of aluminum oxide, 2g of sodium bicarbonate and 1g of potassium ferricyanide in 200ml of water and stir evenly, and continue to stir and mix the slurry for 5 minutes. Afterwards, put the slurry in a drying oven at 100°C for 40 minutes to obtain agglomerated materials, and use a pulverizer to crush them into 40-50 μm powders, and then spray them at the inlet of the fluidized granulator. 1g of γ-aminopropyltriethoxysilane coupling agent is attached to the surface of 9g of ammonium persulfate crystal particles of 40~60 mesh, and then the crystal particles with the coupling agent attached to the powder are fully contacted by convection, so that the powder adheres to the The surface of the crystal particles is formed into spherical particles, and finally dried to obtain the diverting agent in the form of inner wrapping, with a particle size of 20 mesh.

[0028] The guanidine ...

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Abstract

The invention relates to a fracturing inclusion self-dissolving diversion agent and a preparation method thereof. The diversion agent is prepared by using 10-15 parts of guanidine collagen powder, 30-40 parts of ferric trichloride, 30-40 parts of alumina, 1-2 parts of sodium bicarbonate, 8-10 parts of ammonium persulfate, 1-2 parts of potassium ferricyanide and 1 part of gamma-aminopropyltriethoxysilane, has an inclusion form and is spherically granular in shape. The preparation method of the diversion agent comprises the following steps: sequentially dissolving the guanidine collagen powder, the ferric trichloride, the alumina, the sodium bicarbonate, the ammonium persulfate and the potassium ferricyanide in water according to above formula proportions at room temperature, stirring for 5min, carrying out drying caking of the above obtained solution, crushing, milling, spraying the surface of ammonium persulfate with the gamma-aminopropyltriethoxysilane coupling agent, wrapping the external layer of ammonium persulfate crystals by the above prepared powder to form spherical particles, and drying the particles to prepare the diversion agent. The diversion agent has a gel breaker inclusion form, has a self-dissolving capability, and does not need a gel breaking degradation agent in the construction.

Description

technical field [0001] The invention relates to an inclusion self-dissolving diversion agent for oil well fracturing and a preparation method thereof. Background technique [0002] Conventional fracturing fractures generally extend along the direction of the maximum horizontal principal stress. Due to the influence of injection-production well patterns, the extension length of fractures cannot be excessively increased, so the volume of conventional fracturing stimulated reservoirs is limited. In order to increase the drainage area of ​​the oil well, the diversion fracturing technology can be used to open fractures along other directions while the injection-production well pattern remains unchanged, thereby increasing the production of the oil well. The performance of the diverting agent plays a decisive role in the successful implementation of diverting fracturing. [0003] At present, the commonly used diverting agents are: suspension diverting agents, whose disadvantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70
CPCC09K8/706C09K2208/26
Inventor 高瑞民孙晓乔红军申峰吴金桥段玉秀高志亮郭庆景丰张军涛梁小兵展转盈
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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