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

A technology of plugging agent and gel, which is applied in the field of degradable gel plugging agent and its preparation, temperature resistance, and non-crosslinking. Return to the wellbore and other issues to achieve the effects of fast dissolution, convenient construction, and improved pressure bearing capacity

Active Publication Date: 2013-09-18
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

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, and then use 10g of hydroxide After the sodium is neutralized for 1.5 hours, the solid obtained after cooling to room temperature and filtering is the associative monomer maleic acid monohexadecyl ester sodium salt.

[0038] 2. Weigh 7.2 g of sodium hydroxide and dissolve it in 64.8 g of deionized water to prepare a sodium hydroxide solution. Then 15.6 g of acrylic acid was weighed, and 9.6 g of sodium salt of monohexadecyl maleate, an associative monomer synthesized in the first step, was weighed after neutralizing the two for 30 min. 8.4 g of sodium benzenesulfonate, 79.2 g of acrylamide, 115.2 g of deionized water were added, and the mixture was fully stirred and dissolved at 20°C.

[0039] 3. Add 0.3 g of potassiu...

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 use 24g of hydroxide After the sodium is neutralized for 2 hours, the solid obtained after cooling to room temperature and filtering is the associative monomer maleic acid monohexadecyl ester sodium salt.

[0044] 2. Weigh 9.6 g of sodium hydroxide and dissolve it in 70.4 g of deionized water to prepare a sodium hydroxide solution. Then 19.2 g of acrylic acid was weighed, and 8.4 g of sodium salt of monohexadecyl maleate, an associative monomer synthesized in the first step, was weighed after neutralizing the two for 30 min. 6 g of sodium benzenesulfonate, 76.8 g of acrylamide, 209.6 g of deionized water were added, and the mixture was fully stirred and dissolved at 28°C.

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

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, and then use 16.5g of hydrogen peroxide After the sodium is neutralized for 1 hour, the solid obtained after cooling to room temperature and filtering is the associative monomer maleic acid monohexadecyl ester sodium salt.

[0050] 2. Weigh 4.9 g of sodium hydroxide and dissolve it in 39.6 g of deionized water to prepare a sodium hydroxide solution. Then 10.2 g of acrylic acid was weighed, and 4.2 g of the associative monomer monohexadecyl maleate sodium salt synthesized in the first step was weighed after the neutralization reaction was carried out for 30 min. 4.2 g of sodium benzenesulfonate, 46.5 g of acrylamide, 90.4 g of deionized water were added, and the mixture was fully stirred and dissolved at 12°C.

[0051] 3...

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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 which can 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-crosslinking and degradable gel plugging agent and a preparation method thereof. Background technique [0002] The plugging material for drilling is an essential material in the process of drilling leakage prevention and plugging. The success rate of drilling leakage prevention and plugging directly depends on the performance of the plugging material. In my country, in the 1960s, lost circulation materials were used to deal with lost circulation, and some basic research work was carried out. In the 1970s and before, the whole period belonged to the original plugging stage. During this period, the method used to deal with the lost circulation was to block the leakage when it was seen, so as to use high-viscosity drilling fluid and bridge plugging (sawdust, mica, straw, mud balls, etc.). Bricks, etc.) materials and methods such as cement plugging are the main...

Claims

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Application Information

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Patent Type & Authority Patents(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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