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Low-viscosity organic phosphonic acid polymer filtrate reducer as well as preparation method and application thereof

A technology of organic phosphonic acid and fluid loss reducer, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of unfavorable on-site application, etc., and achieve the benefits of on-site application, good calcium and magnesium resistance, and reduced viscosity effect Effect

Pending Publication Date: 2022-05-06
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Integrating various factors such as fluid loss control, calcium resistance and viscosity effect, the existing organic phosphonic acid polymer fluid loss control agent shows significant fluid loss control after aging at 135°C / 16h in composite brine drilling fluid However, the apparent viscosity of its 1% polymer aqueous solution is generally between 40 and 60mpa.s, and the relative molecular weight is relatively high, about 1 million to 1.5 million. It has a relatively obvious viscosity-increasing effect, which is not conducive to field application

Method used

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  • Low-viscosity organic phosphonic acid polymer filtrate reducer as well as preparation method and application thereof
  • Low-viscosity organic phosphonic acid polymer filtrate reducer as well as preparation method and application thereof
  • Low-viscosity organic phosphonic acid polymer filtrate reducer as well as preparation method and application thereof

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preparation example Construction

[0044] The invention provides a method for preparing a low-viscosity organic phosphonic acid polymer fluid loss control agent, comprising the following steps:

[0045] The acrylic phosphonic acid monomer and the acrylamide monomer are polymerized to obtain a low-viscosity organic phosphonic acid polymer fluid loss reducer; the low-viscosity organic phosphonic acid polymer fluid loss reducer has a formula 1 The first repeating unit and the second repeating unit of the structure of formula 2:

[0046]

[0047] Among them, R 1 , R 2 , R 3 and R 4 independently selected from hydrogen, methyl or ethyl; the molar ratio of the first repeating unit to the second repeating unit is (0.03-0.3): (0.7-0.97);

[0048] The relative molecular weight of the low-viscosity organic phosphonic acid polymer fluid loss reducer is 350,000-600,000.

[0049] There are many types of raw materials used in the synthesis of some low-viscosity polymer fluid loss control agents, and the synthesis pro...

Embodiment 1

[0062] Mix isopropenylphosphonic acid and acrylamide according to the mass ratio of 30%:70% to form a monomer mixture aqueous solution with a mass fraction of 30%, and adjust the pH value to 8 with an appropriate amount of lye. And, 0.3% potassium persulfate accounting for the total mass of the monomers was formulated into a 2.0% initiator aqueous solution.

[0063] Add the aqueous solution of the monomer mixture into the reaction vessel, seal it with nitrogen for 30 minutes, remove the oxygen, and raise the temperature to 60°C; under the protection of nitrogen, add the aqueous solution of the initiator into the reaction vessel, stir evenly, and wait for the system After starting to heat up, the reaction was carried out for 3 hours. After the reaction, the obtained product is granulated, dried and crushed to obtain the phosphine-containing drilling fluid fluid loss reducer as white powder.

[0064] The resulting product was characterized by infrared, and the results were as f...

Embodiment 2～7

[0066] According to the method of Example 1, organic phosphonic acid polymer fluid loss reducers were prepared respectively; different formulations and conditions are shown in Table 1:

[0067] The substance consumption and reaction condition of polymerization reaction in the embodiment 2~7 of table 1

[0068]

[0069]

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Abstract

The invention provides a low-viscosity organic phosphonic acid polymer filtrate reducer as well as a preparation method and application thereof. The filtrate reducer has a first repetitive unit of a formula 1 structure and a second repetitive unit of a formula 2 structure, wherein R1, R2, R3 and R4 are independently selected from hydrogen, methyl or ethyl; the molar ratio of the first repeating unit to the second repeating unit is (0.03-0.3): (0.7-0.97); the relative molecular weight of the low-viscosity organic phosphonic acid polymer filtrate reducer is 350,000-600,000. According to the organic phosphonic acid polymer filtrate reducer, only propylene phosphonic acid monomers and acrylamide monomers are used as synthesis raw materials, relatively low apparent viscosity can be obtained, the viscosity effect is obviously reduced, and the organic phosphonic acid polymer filtrate reducer has a remarkable filtrate reduction effect after being aged in composite saline drilling fluid and is beneficial to field application.

Description

technical field [0001] The invention belongs to the technical field of chemical drilling fluid treatment agents for oilfields, and relates to a fluid loss control agent for drilling fluid and a preparation method thereof, in particular to a low-viscosity organic phosphonic acid polymer fluid loss control agent, a preparation method and application thereof. Background technique [0002] In recent years, with the expansion of oil and gas exploration and development areas, the developed oil and gas formations are getting deeper and deeper, and the geological conditions are becoming more and more complex, which poses new challenges to the development of drilling fluid treatment agents. Among them, the drilling fluid fluid loss control agent is one of the most used treatment agents in the drilling process, occupying a core position among all drilling fluid treatment agents, and plays an important role in maintaining stable drilling fluid performance, safe and efficient drilling. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F230/02C08F220/54C09K8/035
CPCC08F220/56C08F220/54C09K8/035C08F230/02
Inventor 孟丽艳苏雪霞徐生婧孙举梁庆磊吕跃滨
Owner 中石化石油工程技术服务有限公司
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