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Resistance reducing agent and preparation method thereof

A drag-reducing agent and initiator technology, which is applied in the field of drag-reducing agent and its preparation, can solve the problems of poor water solubility, high cost, complicated synthesis operation of drag-reducing agent, achieve good stability, reduce preparation cost, and improve fracturing The effect of work efficiency

Active Publication Date: 2020-12-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the alkyl acrylate and its derivatives used in the preparation of the drag reducing agent in the prior art have poor water solubility, such as dodecyl acrylate, and it is necessary to add an appropriate oil phase in the reaction process, which has a certain affinity The emulsifier or co-solvent of the water-lipophilic balance value (HLB value) can make it dissolve, which makes the synthesis operation of the drag reducing agent more complicated and the cost is higher

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  • Resistance reducing agent and preparation method thereof
  • Resistance reducing agent and preparation method thereof
  • Resistance reducing agent and preparation method thereof

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preparation example Construction

[0056] The embodiment of the present invention provides a preparation method of a drag reducing agent, the preparation method comprising:

[0057] Step 1: According to the mass parts of each component, add acrylamide and alkyl polyethylene glycol acrylate two monomers into the reactor, add acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid or p- At least one monomer in sodium styrene sulfonate is also added into the reactor to obtain a mixture solution, and the pH of the mixture solution is adjusted to 8-9.

[0058] In this step, 60-95 parts by mass of acrylamide and 1-5 parts by mass of alkyl polyethylene glycol acrylate are added into the reactor. And, at least one of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, or sodium p-styrenesulfonate is also added to the reactor, and then the pH of the mixture is adjusted.

[0059] Wherein, the mass fraction of acrylic acid does not exceed 10 mass fractions, the mass fraction of 2-acrylamide-2-methylpropanesulfonic a...

Embodiment 1

[0077] This embodiment provides a drag reducing agent, and its drag reducing rate is measured. Wherein, the preparation method of the drag reducing agent comprises:

[0078] According to the mass parts of each component, 85 mass parts of acrylamide, 5 mass parts of octadecyl polyethylene glycol methacrylate, and 10 mass parts of acrylic acid are added to the reactor to obtain a mixture solution. solution to adjust the pH of the mixture solution to 8-9; add water to prepare an aqueous solution with a total monomer mass concentration of 20%, and pass N 2 30min; add 0.1% of the total monomer mass of azobisisobutylamidine hydrochloride, stir evenly, place in a 55°C water bath, and react for 5h to obtain a milky white jelly product; wash the milky white jelly with ethanol , dried and pulverized to obtain the drag reducing agent. For ease of distinction, the drag reducing agent is named D1.

[0079] The assay method of this drag reducing agent D1 comprises:

[0080] Take 20L of...

Embodiment 2

[0083] This embodiment provides a drag reducing agent, and its drag reducing rate is measured. Wherein, the preparation method of the drag reducing agent comprises:

[0084] According to the mass parts of each component, 85 mass parts of acrylamide, 3 mass parts of octadecyl polyethylene glycol acrylate, 7 mass parts of acrylic acid, 5 mass parts of 2-acrylamide-2-form Propanesulfonic acid is added in the reactor, obtains the mixture solution, the pH of the mixture solution is adjusted to 8~9 by NaOH solution; 2 30min; add 0.1% of the total monomer mass of azobisisobutylamidine hydrochloride, stir evenly, place in a 55°C water bath, and react for 5h to obtain a milky white colloidal product; mix the milky white colloidal product with ethanol After washing, drying and crushing, the drag reducing agent is obtained. For ease of distinction, the drag reducing agent is named D2.

[0085] The assay method of this drag reducing agent D2 comprises:

[0086] Take 20L of clear wate...

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Abstract

The invention discloses a resistance reducing agent and a preparation method thereof, and belongs to the technical field of oil and gas field fracturing. The synthetic raw materials of the resistancereducing agent comprise the following components in parts by mass: 60-95 parts of acrylamide and 1-5 parts of alkyl polyethylene glycol acrylate. The synthetic raw materials of the resistance reducingagent further comprise at least one of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid or sodium p-styrenesulfonate, and the balance of water. The synthetic raw materials of the resistance reducing agent are all water-soluble monomers, and the formed resistance reducing agent also has good water solubility and can be rapidly dissolved in water. Therefore, when the resistance reducing agent is prepared, only water needs to be added as a solvent, other oil phases, emulsifiers or cosolvents do not need to be used, the preparation method is simple and easy to operate, and the preparationcost of the resistance reducing agent is reduced. Moreover, the resistance reducing agent is good in stability and high in resistance reducing rate, the acid fracturing operation efficiency can be improved, and the purpose of increasing the yield of the shale gas reservoir is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field fracturing. In particular, it relates to a drag reducing agent and a preparation method thereof. Background technique [0002] my country's shale gas is widely distributed and has great potential for development. However, due to the low porosity, low permeability and strong heterogeneity of shale gas reservoirs, compared with conventional oil and gas resources, it is more difficult to exploit. Therefore, it is necessary to take effective stimulation measures for shale gas reservoirs. The current production stimulation measures for shale gas reservoirs are mainly pumping slick water, through which the shale gas reservoirs are fractured, forming large-scale complex fracture networks in the reservoirs, increasing the seepage area of ​​shale gas, achieve the purpose of increasing production. Among them, when fracturing shale gas reservoirs through slick water, it is necessary to add a dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/28C08F220/06C08F220/58C08F212/14C08F220/30C08F283/06C08F2/10C09K8/68C09K8/88
CPCC08F220/56C08F2/10C08F283/065C09K8/68C09K8/88
Inventor 马新华敬显武
Owner PETROCHINA CO LTD
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