Fluid loss agent and preparation method thereof

A fluid loss agent and cement slurry technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of pressure leakage of salt gypsum layer, low safety of cementing construction, and rheology of salt-containing high-density cement slurry. Problems such as poor performance

Active Publication Date: 2021-02-23
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, polyvinyl alcohol fluid loss reducers are mainly used in medium and low temperature conditions, and the salt paste layer is generally buried deep and the temperature is high, and polyvinyl alcohol type fluid loss reducers are not resistant to salt, so they are not suitable for the preparation of salt paste layer. Cement slurry for well operations
However, the dispersion of AMPS polymer fluid loss reducer in cement slurr...

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  • Fluid loss agent and preparation method thereof
  • Fluid loss agent and preparation method thereof
  • Fluid loss agent and preparation method thereof

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preparation example Construction

[0059] The embodiment of the present invention provides a preparation method of fluid loss reducer, the preparation method comprising:

[0060] Step 1: Add water, 2-acrylamide-2-methylpropanesulfonic acid, cyclic monomer, amide monomer, carboxylic acid monomer, chain monomers, lubricants and surfactants to obtain a reaction solution.

[0061] The parts by weight of each component are: 300-400 parts by weight of water, 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 3-5 parts by weight of cyclic monomers, and 8-10 parts by weight of amide monomers. parts by weight, 1 to 3 parts by weight of carboxylic acid monomers, 0.1 to 0.5 parts by weight of chain monomers, 1 to 3 parts by weight of lubricants and 1 to 3 parts by weight of surfactants. sequentially added to the reactor.

[0062] Wherein, the reactor can be a four-necked flask with a thermometer, a stirrer, and a reflux condenser.

[0063] Step 2: Stir at a speed of 200 rpm. After all components are diss...

Embodiment 1

[0072] According to the parts by weight of each component, 300 parts by weight of water, 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts by weight of N-vinylpyrrolidone, 8 parts by weight of The acrylamide of part, the itaconic acid of 2 parts by weight, the first allyl polyethylene glycol of 0.3 part by weight, the talcum powder of 2 parts by weight, the dodecyl dimethyl benzyl ammonium bromide of 1 part by weight , to obtain a reaction solution; stir at a speed of 200 rpm, and after all components are dissolved, adjust the pH of the reaction solution to 8, and raise the temperature of the reaction solution to 60°C; add the initiator to the reaction solution Ammonium persulfate was reacted for 2 hours and cooled to room temperature to obtain fluid loss reducer.

Embodiment 2

[0074] According to the parts by weight of each component, 300 parts by weight of water, 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts by weight of N-ethylene caprolactam, 10 parts by weight of N-ethylene caprolactam, N,N-dimethylacrylamide, 3 parts by weight of maleic anhydride, 0.5 parts by weight of the second allyl polyethylene glycol, 3 parts by weight of graphite, 3 parts by weight of dodecylbenzenesulfonic acid sodium to obtain the reaction solution; stir at a speed of 200 rpm, and after all components are dissolved, adjust the pH of the reaction solution to 8, and raise the temperature of the reaction solution to 60°C; agent ammonium persulfate, reacted for 2 hours, and cooled to room temperature to obtain fluid loss reducer.

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Abstract

The invention discloses a fluid loss agent and a preparation method thereof, and belongs to the technical field of oil field well cementation. The fluid loss agent provided by the embodiment of the invention comprises the following components in parts by weight: 100 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.1-0.5 part of a chain monomer, 1-3 parts of a lubricant, 1-3 parts of a surfactant, 3-5 parts of a cyclic monomer, 8-10 parts of an amide monomer, 1-3 parts of a carboxylic acid monomer and 300-400 parts of water. The fluid loss agent provided by the embodiment of the inventionis suitable for salt paste layer well cementation operation, and salt-containing high-density cement paste prepared from the fluid loss agent has excellent stability and rheological property under the condition of low liquid-solid ratio, is rapid in strength development and high in strength under the condition of large temperature difference, and can effectively reduce the flowing resistance of the salt-containing high-density cement paste under the condition of salt paste layer narrow safe density window well cementation, so that the well cementation construction safety is effectively guaranteed, and the well cementation quality is improved.

Description

technical field [0001] The invention relates to the technical field of oil field cementing. In particular, it relates to a fluid loss reducing agent and a preparation method thereof. Background technique [0002] There are salt-gypsum layers in many oilfield blocks in my country, and the salt-gypsum layers are formations containing sodium chloride and other water-soluble inorganic salts. The salt-gypsum layer is generally buried deep and the pressure is high. There is a high-pressure brine layer in the salt-gypsum layer, which is prone to accidents such as well kick and blowout. Therefore, high-density cement slurry is required to stabilize the salt-gypsum during cementing operations. Floor. At the same time, there are weak layers between the salt-gypsum layers. During cementing, when the dynamic equivalent density of the cement slurry is too high, it is easy to leak the salt-gypsum layer, and the cement slurry leaks into the salt-gypsum layer and other layers except the s...

Claims

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Application Information

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IPC IPC(8): C09K8/487
CPCC09K8/487
Inventor 邹双邹建龙曾建国赵宝辉王建瑶石凌龙辛海鹏涂思琪敖康伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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