Repeated fracturing temporary blocking agent and preparation method and application thereof

A technology of repeated fracturing and temporary plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of insufficient performance to meet requirements, high cost, not suitable for large-scale promotion, etc. Improve the effect of dissolution and controllable dissolution rate

Active Publication Date: 2019-05-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for formations with higher temperatures, the performance is not enough to meet the requirements, and the cost is high, which is not suitable for large-scale promotion

Method used

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  • Repeated fracturing temporary blocking agent and preparation method and application thereof
  • Repeated fracturing temporary blocking agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 100g of bone glue (average molecular weight 40000-80000) to 200g of sodium chloride aqueous solution with a salinity of 1000mg / L, dissolve in a water bath at 60°C, and stir evenly; add 200g of acrylamide monomer, stir evenly; then add chain transfer Potassium formate 3g, stir evenly; then add 0.2g cross-linking agent N,N-methylenebisacrylamide, stir evenly; add acidic silica sol 0.2g and urea 0.2g, stir evenly; pass nitrogen to the mixed solution to remove oxygen 10min; then add 50mL of 20g / L ammonium persulfate solution of initiator. Seal the reaction until the temperature no longer rises, and the product is crushed to obtain the temporary plugging agent.

Embodiment 2

[0041] Add 200g of bone glue (average molecular weight 40000-80000) to 200g of sodium chloride aqueous solution with a salinity of 1000mg / L, dissolve in a water bath at 60°C, and stir evenly; add 200g of acrylamide monomer, stir evenly; then add chain transfer Potassium formate 3g, stir evenly; then add 0.2g cross-linking agent N,N-methylenebisacrylamide, stir evenly; add acidic silica sol 0.2g and urea 0.2g, stir evenly; pass nitrogen to the mixed solution to remove oxygen 10min; then add 50mL of 20g / L ammonium persulfate solution of initiator. Seal the reaction until the temperature no longer rises, and the product is crushed to obtain the temporary plugging agent.

Embodiment 3

[0043]Add 150g of bone glue (average molecular weight 40000-80000) to 200g of sodium chloride aqueous solution with a salinity of 1000mg / L, dissolve in a water bath at 60°C, and stir evenly; add 200g of acrylamide monomer, stir evenly; then add chain transfer Potassium formate 4g, stir evenly; then add 0.3g cross-linking agent N,N-methylenebisacrylamide, stir evenly; add acidic silica sol 0.3g and urea 0.3g, stir evenly; pass nitrogen to the mixed solution to remove oxygen 10min; then add 50mL of 20g / L ammonium persulfate solution of initiator. Seal the reaction until the temperature no longer rises, and the product is crushed to obtain the temporary plugging agent.

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Abstract

The invention relates to a repeated fracturing temporary blocking agent and a preparation method and application thereof. The repeated fracturing temporary blocking agent is prepared from acrylamide,bone glue, an initiator, a cross-linking agent and a chain transfer agent; the mass ratio of the bone glue to the acrylamide is 1:(1-2); the mass of the initiator is 0.5-1% of that of the acrylamide,the mass of the cross-linking agent is 0.1-0.2% of that of the acrylamide, and the mass of the chain transfer agent is 1.5-2% of that of the acrylamide. The repeated fracturing temporary blocking agent further comprises an admixture, and the mass of the admixture is 0.6-1.2% of that of the acrylamide. The temporary blocking agent has the maximum breakthrough pressure of 16 MPa and the adjustable dissolution time of 16-72 h and has the advantages of high-strength blocking and dissolubility in the stratum.

Description

Technical field: [0001] The invention mainly relates to a temporary plugging agent for repeated fracturing and its preparation method and application. The plugging agent can stably plug fracturing fractures under formation conditions and is applied in the field of oilfield chemical technology. Background technique: [0002] With the prolongation of development time, the distribution of remaining oil becomes more and more complex, the difficulty of well selection and layer selection becomes more and more difficult, the conditions of oil well fracturing well layers gradually deteriorate, and the fracturing potential becomes smaller, so it is required to further improve the level of fracturing technology . As one of the important measures to increase and stabilize oilfield production, hydraulic fracturing technology has been widely used in the development of low-permeability sandstone reservoirs, and the artificial fractures produced have high conductivity. Because the fractur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/68C09K8/514
Inventor 覃宇葛际江吴千慧
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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