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High-temperature-resistant fluid loss agent and preparation method thereof as well as water-based drilling fluid

A filtrate reducer, high temperature resistance technology, applied in the field of petroleum drilling fluid, can solve the problems of easy decomposition, poor temperature resistance, weakened filter loss effect, etc.

Inactive Publication Date: 2018-07-31
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many types of fluid loss control agents used in the drilling process of oil fields, but their temperature resistance is poor, especially in the operation process of deep wells and ultra-deep wells. Existing fluid loss control agents are easily decomposed at higher temperatures , the fluid loss control effect is weakened; if the fluid loss control agent is under saline conditions, the pyrolysis of the fluid loss control agent is more serious

Method used

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  • High-temperature-resistant fluid loss agent and preparation method thereof as well as water-based drilling fluid
  • High-temperature-resistant fluid loss agent and preparation method thereof as well as water-based drilling fluid
  • High-temperature-resistant fluid loss agent and preparation method thereof as well as water-based drilling fluid

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preparation example Construction

[0026] The present invention provides a kind of preparation method of anti-high temperature fluid loss reducer, comprising the following steps:

[0027] providing an aqueous solution of comonomers; said comonomers include acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, sodium styrenesulfonate and acrylonitrile;

[0028] adjusting the pH value of the aqueous comonomer solution to 8-9 by using an alkaline pH regulator to obtain an alkaline monomer solution;

[0029] Mixing the alkaline monomer solution with an oxidized initiator, a reduced initiator, and a molecular weight regulator, and performing a polymerization reaction to obtain a gel product;

[0030] The gel product is dried to obtain a high temperature resistant fluid loss reducer.

[0031] In the present invention, unless otherwise specified, the raw materials used in the preparation method are commercially available products well known to those skilled in the art.

[0032] In this application, un...

Embodiment 1

[0054] In parts by mass, add 130 parts of distilled water, 315 parts of acrylic acid and 315 parts of acrylamide into a four-neck flask equipped with a stirrer, reflux condenser, thermometer and heating device, start the stirrer, and stir until the monomers are completely dissolved. Add 145 parts of 2-acrylamido-2-methylpropanesulfonic acid and 235 parts of sodium styrenesulfonate, heat in a water bath to 60° C. and keep warm until the monomer dissolves to obtain a comonomer aqueous solution.

[0055] Adjust the pH value to 8-9 with NaOH solution. Simultaneously pass nitrogen to drive oxygen, add 1.5 parts of initiator ammonium persulfate to react for 5 minutes at 60°C, then add 1.5 parts of sodium bisulfite to react for 40 minutes, then add 1.3 parts of molecular weight regulator thioglycolic acid, react for 4 hours to obtain a gel shaped product.

[0056] The obtained gel-like product was dried in a drying oven at a constant temperature of 65° C., and after being dried to a...

Embodiment 2

[0060] In parts by mass, add 150 parts of distilled water, 325 parts of acrylic acid and 325 parts of acrylamide into a four-neck flask equipped with a stirrer, reflux condenser, thermometer and heating device, start the stirrer, and stir until the monomers are completely dissolved. Add 150 parts of 2-acrylamido-2-methylpropanesulfonic acid and 250 parts of sodium styrenesulfonate, and heat in a water bath to 60° C. to dissolve the monomers to obtain a comonomer aqueous solution.

[0061] Adjust the pH value to 8-9 with NaOH solution. Simultaneously pass nitrogen to drive oxygen, add 1.55 parts of initiator ammonium persulfate to react for 3 minutes at 60°C, then add 1.55 parts of sodium bisulfite to react for 30 minutes, then add 1.3 parts of molecular weight regulator thioglycolic acid, react for 4 hours to obtain a gel shaped product.

[0062] The obtained gel-like product was dried in a drying oven at a constant temperature of 65° C., and after being dried to a water cont...

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Abstract

The invention provides a high-temperature-resistant fluid loss agent and a preparation method thereof. According to the invention, the preparation conditions are strictly controlled to obtain a polymer formed by co-polymerization of various monomers, and due to statistical characteristics of the polymer in a formation process, a characteristic of non-uniform molecular weight of the fluid loss agent, i.e., polydispersity of the molecular weight, is formed, thus greatly improving the rheological property and temperature and salt resistance of the drilling fluid under high temperature conditions;in addition, the molecular structure of the high-temperature-resistant fluid loss agent also contains benzene rings which have stronger rigidity than linear molecular chains, enhance the rigidity ofmolecular chains, improve the thermal stability of the fluid loss agent, and improve the temperature resistance of the fluid loss agent in a drilling fluid. The invention also provides a water-based drilling fluid containing the high-temperature-resistant fluid loss agent. The fluid loss agent provided by the invention can still maintain good fluid loss reducing property under a high-temperature condition of 200 DEG C in a fresh water-based slurry and also can maintain good fluid loss reducing property under a high-temperature condition of 160 DEG C in a composite brine-based slurry.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluids, in particular to an anti-high temperature fluid loss reducer, a preparation method thereof and a water-based drilling fluid. Background technique [0002] The quality of drilling fluid is the key to the success of the entire drilling project, and the level of drilling fluid technology is also an important indicator to measure the level of drilling. With the continuous development of petroleum exploration and development technology, the exploration and development of oil and gas has gradually turned to ultra-deep formations. During the exploration and development of deep wells and ultra-deep wells, the formations encountered are becoming more and more complex, and the requirements for drilling fluid performance are more stringent. [0003] During the drilling process, as the well depth increases, the downhole temperature will become higher and higher, and the pressure will also ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24C08F220/06C08F220/56C08F220/58C08F212/14
CPCC08F220/06C08F220/56C09K8/035C09K8/24C08F220/585C08F212/14
Inventor 邵宁张怀科于培志安玉秀
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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