Degradable fracturing propping agent and preparation method thereof

A fracturing proppant and solvent technology, which is applied in chemical instruments and methods, earthwork drilling, production of fluids, etc., can solve the problems that the research on degradable fracturing proppant has not been reported, and achieves low price, simple preparation process, and low cost. cost effect

Inactive Publication Date: 2017-06-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are studies on low-density, medium-high strength sintered ceramsite, development of low-density hollow or porous proppants, and research on double-layer resin coating technology, but research on degradable fracturing proppants has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a degradable fracturing proppant, which is prepared by the following steps:

[0031] The preparation of modified starch: in the aqueous solution of modifying agent (maleic anhydride 0.15g, sodium periodate 0.12g, phosphorus oxychloride 0.08g), appropriate amount of starch agent (dimethyl dimethylformamide 2.30) to cornstarch 10kg was improved, and the product was dried at 70°C for later use;

[0032] Preparation of copolymer: gelatinize 8kg of the above-mentioned modified starch and 100L of lactic acid at 80°C for 1.5 hours, dehydrate under vacuum (0.085MPa) at 105°C until the system has no bubbles and no water vapor flows out, and then add 0.60g of zinc oxide, caprylic acid 0.45 g of stannous was reacted at 130°C for 5 hours, and at 140°C for 15 hours; the product was dissolved in chloroform (insoluble matter was removed by filtration), precipitated with methanol, centrifuged, the product was dissolved and precipitated repeatedly, and the preci...

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PUM

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Abstract

The invention provides a degradable fracturing propping agent and a preparation method thereof. The degradable fracturing propping agent comprises inorganic salt and a copolymer, wherein the copolymer is coated to the inorganic salt; the copolymer is obtained by grafting and copolymerizing reaction of modified starch and lactic acid under the action of a catalyst. The invention also provides the preparation method of the degradable fracturing propping agent. The degradable fracturing propping agent has the advantages that the cost is low, the preparation technology is simple, and the recovery rate of crude oil is effectively increased.

Description

technical field [0001] The invention relates to a fracturing proppant and a preparation method thereof, in particular to a degradable fracturing proppant and a preparation method thereof, and belongs to the technical field of petrochemical industry. Background technique [0002] Fracturing technology plays a very important role in oil extraction, and fracturing proppant (a ceramic particle product with high fracturing strength, mainly used for downhole support in oil fields to increase oil and gas production) is an important The key to the success of fracturing technology. [0003] In the fracturing process of tight oil and gas, low-permeability, ultra-low-permeability oilfields, etc., if the fractures formed by fracturing are not closed and the oil products flow smoothly, proppant and fracturing fluid can be used to enter the formation together to fill the rock formation. The release of stress will not cause cracks to close, in order to improve oil conductivity and increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80C08B31/00C08B31/04C08B31/06C08K3/16C08L3/04
CPCC09K8/805C08B31/00C08B31/04C08B31/06C08K3/16C08L3/04
Inventor 李霞李军徐乐张子明李超郭琳关伟包放李玉印张文昌苏建齐红显曾双红高晓婷李杨韩冬深
Owner PETROCHINA CO LTD
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