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Temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and preparation method thereof

A technology of plugging agent and gel, applied in the field of degradable gel plugging agent and its preparation, temperature resistance, no cross-linking, can solve the problem of non-degradable or incomplete degradation, pollution of oil production channels and oil layers, Return to the wellbore and other issues to achieve the effects of fast dissolution, convenient construction and improved pressure bearing capacity

Active Publication Date: 2012-02-22
北京爱普聚合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that these materials play a temporary plugging role by accumulating at the fracture opening and consolidating particles after filtration, so it is easy to encounter resistance when running down after static plugging, and it requires a movable pipe string to run smoothly and run smoothly. Under the conditions of drilling, vibration, liquid flow and other conditions, it is easy to leak again, and the validity period is short
At the same time, this kind of plugging material is very easy to return to the wellbore from the fracture opening during the drilling process and when the pressure in the leaky zone increases, resulting in plugging failure; the plugging material existing in the wellbore cannot Degradation or incomplete degradation will cause pollution to oil production channels and oil layers in subsequent construction operations, causing serious damage

Method used

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  • Temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and preparation method thereof
  • Temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and preparation method thereof
  • Temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation and performance test of gel plugging agent 1:

[0037] 1. Weigh 24g of maleic anhydride and dissolve it in 112.4g of toluene solvent, add 52g of n-hexadecanol, and add 1.6g of catalyst sodium p-toluenesulfonate to react at 62°C for 8 hours, then use 10g of hydrogen to oxidize After the sodium was neutralized for 1.5 hours, the solid obtained after cooling to room temperature and filtering was the sodium hexadecyl maleate, an association monomer.

[0038] 2. Weigh 7.2g of sodium hydroxide and dissolve it in 64.8g of deionized water to prepare a sodium hydroxide solution. Then take by weighing acrylic acid 15.6g, after the two carry out neutralization reaction 30min, weigh the association monomer monohexadecyl maleate sodium salt 9.6g synthesized in the first step, the anionic monomer is to vinyl Add 8.4g of sodium benzenesulfonate, 79.2g of acrylamide, add 115.2g of deionized water, and fully stir and dissolve at 20°C.

[0039] 3. Add 0.3g of potassium pers...

Embodiment 2

[0042] Preparation and performance test of gel plugging agent 2:

[0043]1. Weigh 56g of maleic anhydride and dissolve it in 197.6g of toluene solvent, add 120g of n-hexadecanol, and add 2.4g of catalyst sodium p-toluenesulfonate to react at 78°C for 6 hours, and then oxidize with 24g of hydroxide After the sodium was neutralized for 2 hours, the solid obtained after cooling to room temperature and filtering was the sodium hexadecyl maleate, an association monomer.

[0044] 2. Weigh 9.6g of sodium hydroxide and dissolve it in 70.4g of deionized water to prepare a sodium hydroxide solution. Then take by weighing acrylic acid 19.2g, after the two carry out neutralization reaction 30min, weigh the association monomer monohexadecyl maleate sodium salt 8.4g synthesized in the first step, the anionic monomer is to vinyl Add 6g of sodium benzenesulfonate, 76.8g of acrylamide, add 209.6g of deionized water, and fully stir and dissolve at 28°C.

[0045] 3. Add 0.8g of ammonium persul...

Embodiment 3

[0048] Preparation and performance test of gel plugging agent 3:

[0049] 1. Weigh 39g of maleic anhydride and dissolve it in 157.5g of toluene solvent, add 84g of n-hexadecanol, and add 3g of catalyst sodium p-toluenesulfonate to react at 71°C for 7 hours, then use 16.5g of hydrogen to oxidize After the sodium was neutralized for 1 hour, the solid obtained after cooling to room temperature and filtering was the sodium hexadecyl maleate, an association monomer.

[0050] 2. Weigh 4.9g of sodium hydroxide and dissolve it in 39.6g of deionized water to prepare a sodium hydroxide solution. Then take by weighing acrylic acid 10.2g, after the two carry out neutralization reaction 30min, weigh the association monomer hexadecyl maleate sodium salt 4.2g synthesized in the first step, anionic monomer to vinyl Sodium benzenesulfonate 4.2g, acrylamide 46.5g, add deionized water 90.4g, fully stir and dissolve at 12°C.

[0051] 3. Add 0.5g of potassium persulfate, 0.5g of sodium bisulfite...

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Abstract

The present invention provides a temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and a preparation method thereof. The gel leak-stopping agent of the present invention has the following advantages that: the gel leak-stopping agent has extra-wide temperature adaptability, can adapt to a temperature range of 25-180 DEG C, and can meet requirements of oil field construction; the gel leak-stopping agent has rapid dissolution rate, and forms the structure type gel with good shear thinning behavior after dissolving, wherein the structure type gel is the liquid whichcan be pumped and flow; the gel leak-stopping agent does not require cross-linking; the real fluid leak-stopping is realized; the construction is convenient; the product is completely dissolved in water, no precipitate and flocculent insoluble matter are generated during the whole process, no insoluble matter is generated after the product is degraded, such that the flow back is easy or the flow back is not required, the reservoir is not damaged; the product is safe and environmental protection, and is synthesized by the multi-stage initiation, such that the product conversion rate is high, the stability is good, no toxic damage is generated to the stratum, the production layer can be protected.

Description

technical field [0001] The invention relates to an engineering material, in particular to a temperature-resistant, non-crosslinked, degradable gel plugging agent and a preparation method thereof. Background technique [0002] Drilling plugging material is an essential material in the process of drilling leak prevention and plugging. The success rate of drilling leak prevention and plugging directly depends on the performance of the plugging material. In our country, since the 1960s, the application of plugging materials to deal with lost circulation has begun, and some basic research work has been carried out. The 1970s and the entire period before belonged to the original plugging stage. During this period, the method used to deal with lost circulation was to plug the leak as soon as it was seen, and to use high-viscosity drilling fluid plus bridge plugging (sawdust, mica, straw, mud ball, Bricks, etc.) materials and methods such as cement plugging. Due to the limited und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F222/14C08F212/14C08F4/40C09K8/44
Inventor 郑焰罗于建白小丹
Owner 北京爱普聚合科技有限公司
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