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Preparation method of self-suspension self-degradation propping agent

A proppant and self-degrading technology, which is applied in chemical instruments and methods, earthwork drilling, and production of fluids, etc., can solve the problems of poor fluidity and high viscosity of the carrier fluid, and achieve cost reduction, good viscosity reduction effect and reasonable process design. Effect

Active Publication Date: 2019-05-21
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the fracturing operation is completed, in order to resume production as soon as possible, the carrier fluid needs to be discharged out of the fracture. However, due to the high viscosity and poor fluidity of the carrier fluid, it is usually necessary to add ammonium persulfate microcapsules to the carrier fluid in advance to delay fracture. glue purpose

Method used

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Embodiment 1

[0019] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0020] Step 1, using solvent water (distilled water or tap water or oil field production sewage) to prepare sucrose solution; the sucrose used as the binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 31%;

[0021] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 45 mesh;

[0022] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0023] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordi...

Embodiment 2

[0026] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0027] Step 1, using solvent water (distilled water or tap water or oil field production sewage) to prepare a sucrose solution; the sucrose used as a binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 12%;

[0028] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 20 mesh;

[0029] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0030] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordi...

Embodiment 3

[0033] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0034] Step 1, using solvent water (distilled water or tap water or oilfield production sewage) to prepare sucrose solution; the sucrose used as the binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 50%;

[0035] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 70 mesh;

[0036] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0037] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordin...

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Abstract

The invention belongs to the technical field of oil deposit and gas reservoir fracturing, in particular to a preparation method of a self-suspension self-degradation propping agent, and the preparation method comprises the following steps: preparing a sucrose solution by adopting a solvent water; soaking and washing a propping agent with an dilute acid solution, and putting the propping agent intoa sucrose solution for soaking; taking out the propping agent from the sucrose solution, and airing or baking to remove excess moisture on the surface while keeping the outer surface of the proppingagent in a wet state; mixing the propping agent with polymer fine powder particles, a nano dispersing agent and an ammonium persulfate microcapsule according to a certain ratio, and uniformly stirringand drying to obtain a block-shaped object; and rolling and dispersing the block-shaped object, sieving and bagging to obtain the self-suspension self-degradation propping agent for later use. The propping agent is prepared by the method, and the propping agent has the characteristics of on-line preparation and injection processes of an existing self-suspension propping agent ore field; and further simplifies the process steps and the relevant cost of the injection process, and the mixing uniformity degree of the gel breaker ammonium sulfate microcapsule and a carrying solution is higher, theglue breaking speed is higher, and the viscosity reducing effect is better.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir and gas reservoir fracturing, and in particular relates to a preparation method of a self-suspension and self-degradation proppant. Background technique: [0002] In recent years, as the development of old oilfields in the eastern part of China has gradually entered the stage of medium-high water cut development, it is difficult to reverse the situation of production decline. Technology is an important technical means to realize the effective development of low-permeability oil and gas reservoirs and unconventional oil and gas reservoirs. The annual production of tight oil in the United States in 2015 reached 2.59×10 8 t, accounting for 45% of the annual oil production; the annual production of unconventional gas is 4500×10 8 m 3 , accounting for 50% of the annual natural gas production. From 2000 to 2012, the proportion of low-permeability and ultra-low-permeability reservoirs in my co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80C09K8/92
Inventor 卢祥国曹伟佳陈清刘义刚张云宝张楠何欣
Owner NORTHEAST GASOLINEEUM UNIV