Temporary plugging agent for temporary plugging diversion for overcoming high stress difference in shale gas fracturing, and preparation method thereof

A temporary plugging agent, high stress technology

Active Publication Date: 2018-07-20
BEIJING GEPETTO OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another purpose of the present invention is to solve the defects of the existing temporary plugging agent: the temporary plugging agent composed of inorganic salts will cause permanent blockage of the formation, which is not conducive to the later oil and gas exploitation, and the cross-linked polymer temporary plugging agent needs to be added to br

Method used

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  • Temporary plugging agent for temporary plugging diversion for overcoming high stress difference in shale gas fracturing, and preparation method thereof
  • Temporary plugging agent for temporary plugging diversion for overcoming high stress difference in shale gas fracturing, and preparation method thereof
  • Temporary plugging agent for temporary plugging diversion for overcoming high stress difference in shale gas fracturing, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Add 200 grams of distilled water to a 500 ml reaction vessel, turn on the stirring, and then add 28 grams of xanthan gum, 10 grams of sodium polyacrylate, and 8 grams of ammonium polyphosphate (NH 4 ) 12 P 10 O 31 , 22 grams of sodium rosinate and 32 grams of polyethylene glycol 10000, and the reaction system is gradually heated to 80 ℃, continue to stir for 2 hours, until all dissolved, then cooled to 50 ℃, discharge and vacuum dry to obtain the initial product, proceed Sieving to obtain a 20-60 mesh temporary plugging agent. Or the initial product is heated and melted by a screw extruder and extruded, cut and pelletized with a pelletizer, and formed into particles with a particle size of 5-8mm, or processed into a temporary plugging ball of 5-25mm with an injection molding machine. The temporary plugging agent synthesized by this method is suitable for temporary plugging construction of shale gas wells above 120℃.

Example Embodiment

[0028] Example 2

[0029] Add 200 grams of distilled water to a 500 ml reaction flask, turn on the stirring, and then add 12 grams of Sesbania Gum, 15 grams of Xanthan Gum, 12 grams of sodium polyacrylate, 5 grams of ammonium polyphosphate (NH 4 ) 16 P 14 O 43 , 3 grams of ammonium polyphosphate (NH 4 ) 18 P 16 O 49 , 20 grams of sodium rosinate, 20 grams of polyethylene glycol 10000 and 13 grams of polyethylene glycol 20000, and the reaction system is gradually heated to 80°C, and stirring is continued for 2h until all is dissolved, then the temperature is reduced to 50°C, and the discharging proceeds Vacuum drying to obtain the initial product, which is sieved to obtain a 20-60 mesh temporary plugging agent. Or the initial product is heated and melted by a screw extruder and extruded, cut and pelletized with a pelletizer, and formed into particles with a particle size of 5-8mm, or processed into a temporary plugging ball of 5-25mm with an injection molding machine. The temporar...

Example Embodiment

[0030] Example 3

[0031] The temporary plugging agent prepared in Example 2 was added to the fracturing fluid to determine the performance of the temporary plugging agent. The preferred temporary plugging slippery water fracturing fluid formula: 0.1% drag reducer + 0.1% drainage aid + 0.2% clay stabilizer + 5% powder temporary plugging agent. The experiment was carried out at 120°C, and the performance test results of the temporary plugging agent are shown in Table 1.

[0032] Table 1. Performance test results of temporary plugging agent (120℃)

[0033] project

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Abstract

The invention discloses a temporary plugging agent for temporary plugging diversion for overcoming a high stress difference in shale gas fracturing. The temporary plugging agent is prepared through reacting vegetable gum, sodium polyacrylate, ammonium polyphosphate, sodium rosinate and polyethylene glycol. A preparation method of the temporary plugging agent comprises the following steps: adding acertain amount of distilled water into a reaction container, adding the vegetable gum, sodium polyacrylate, ammonium polyphosphate, sodium rosinate and polyethylene glycol, stirring all above substances and the distilled water, heating the obtained reaction solution to 80 DEG C, continuing constant temperature stirring for 2 h until all the substances are completely dissolved, then cooling the obtained solution to 50 DEG C, discharging the cooled solution, and performing vacuum drying to obtain a head product. The temporary plugging agent is obtained by compounding natural polymer compounds,has a good degradation performance, has a degradation rate reaching up to 100%, has strong temperature resistance, can resist to a temperature reaching up to 180 DEG C, and has a high compressive strength reaching up to 80 MPa; and a degradation solution formed by degrading the temporary plugging agent has no damages or pollution, so the temporary plugging agent is safe, and is environment to theenvironment.

Description

Technical field [0001] The invention belongs to the technical field of oilfield production increase, and in particular relates to a temporary plugging agent for shale gas fracturing to overcome high stress difference temporary plugging and steering and a preparation method thereof. Background technique [0002] Shale gas is an unconventional natural gas resource, with huge reserves of technologically exploitable worldwide. In recent years, with breakthroughs in production technology, the United States has realized the commercial exploitation of shale gas, which has broad prospects for the large-scale utilization of shale gas. [0003] In the process of shale gas fracturing, in order to overcome the high stress difference and change the flow direction of the original liquid to achieve the purpose of generating new fractures, a high-strength temporary plugging agent has been developed for the temporary plugging of shale gas wells. The dissolution performance of the agent is tested i...

Claims

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Application Information

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IPC IPC(8): C09K8/514C09K8/516
CPCC09K8/514C09K8/516
Inventor 曾斌徐太平周京伟
Owner BEIJING GEPETTO OIL TECH
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