Drag reducing agent and preparation method thereof
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The technology of a drag reducing agent and an initiator is applied in the field of drag reducing agent and its preparation, which can solve the problems of poor water solubility, high cost, complicated synthesis operation of drag reducing agent, etc., achieves good stability, reduces preparation cost, and improves fracturing The effect of work efficiency
Active Publication Date: 2022-06-03
PETROCHINA CO LTD
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[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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[0060] In this step, NaOH solution can be used to adjust the pH of the aqueous solution. Further, when water is conditioned by NaOH solution
[0063] It should be noted that the total monomer is a general term for the monomers other than water in the aqueous solution. For example, in preparing drop
[0065] The initiator is used to initiate random copolymerization of the components in the aqueous solution to obtain a polymer. in a possible
[0067] It should be noted that the quality of the initiator added should be appropriate, not too much or too little. when the join triggers
[0068] It should be noted that, in this step, preferably, the reaction temperature is 50~60 ℃, and the reaction time is 5~7h.
Embodiment 1
[0077] The present embodiment provides a drag-reducing agent, and its drag-reducing rate is measured. Wherein, the preparation method of this resistance reducing agent
[0081] As can be seen from Figure 1: with the increase of the flow rate, the resistance reduction rate of D1 is also increasing. And when the flow rate is small, the resistance is reduced
Embodiment 2
[0083] The present embodiment provides a drag-reducing agent, and its drag-reducing rate is measured. Wherein, the preparation method of this resistance reducing agent
[0087] As can be seen from Figure 2: as the flow rate increases, the resistance reduction rate of D2 also increases. And when the flow rate is small, the resistance is reduced
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Abstract
The invention discloses a drag reducing agent and a preparation method thereof, belonging to the technical field of oil and gas field fracturing. The synthetic raw material of the drag reducing agent includes the following components in parts by mass: 60-95 parts by mass of acrylamide, 1-5 parts by mass of alkyl polyethylene glycol acrylate; the synthetic raw material of the drag reducing agent also includes : At least one of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid or sodium p-styrenesulfonate, the balance being water; the synthetic raw materials of the drag reducer are all water-soluble monomers, and the formed drag reducer The resist also has good water solubility and can dissolve quickly in water. Therefore, the drag reducer only needs to add water as a solvent during preparation, and does not need to use other oil phases, emulsifiers or co-solvents, the preparation method is simple and easy to operate, and the preparation cost of the drag reducer is reduced. Moreover, the drag reducing agent has good stability and a high drag reducing rate, can improve the efficiency of acid fracturing operations, and achieve the purpose of increasing production of shale gas reservoirs.
Description
Resistance reducing agent and preparation method thereof technical field [0001] The present 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 huge development potential. However, due to the low porosity of shale gas reservoirs Compared with conventional oil and gas resources, it is more difficult to exploit due to the characteristics of high permeability, low permeability and strong heterogeneity. Therefore, the need for shale Take effective measures to increase production of gas reservoirs. The current measures to increase production of shale gas reservoirs are mainly to pump slick water through Slippery water fracturing the shale gas reservoir, forming a large-scale complex fracture network in the reservoir, increasing the shale gas seepage area, reaching purpose of increasi...
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