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High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer

A suspension stabilizer and spacer fluid technology, applied in chemical instruments and methods, earthwork drilling, sealing/packing, etc. problem, to achieve the effect of good suspension stability, guaranteeing cementing quality, and good temperature resistance.

Inactive Publication Date: 2015-10-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, it can be seen that the spacer suspensions in the prior art mostly use cellulose, xanthan gum and clay substances, and their composition is relatively simple.
In the cementing operation of deep and ultra-deep wells, viscosifying materials and suspension stabilizers are prone to pyrolysis or molecular chain breakage at high temperatures, which completely fail to suspend solid particles and wash away mud cakes, seriously affecting the spacer fluid. High temperature stability and displacement efficiency, serious cases will lead to well collapse or lost circulation, which will affect the quality of cementing

Method used

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  • High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer
  • High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer
  • High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 70 parts by weight of attapulgite into the CM500-Ⅱ powder mixer, turn on the motor, and slowly add 16 parts by weight of Wenlun gum, 3 parts by weight of xanthan gum, 7 parts by weight of sodium chloride and 4 parts by weight of polyvinyl alcohol, then close the mixing bin, turn on high-speed stirring, and mix at 160 r / min for 4 hours and then collect the materials, that is, the high-temperature isolation liquid suspension stabilizer prepared in this example, Denoted as sample I.

Embodiment 2

[0044] Weigh 62 parts by weight of bentonite and add it into the CM500-II type powder mixer, turn on the motor, and slowly add 18 parts by weight of Wenlun gum, 2 parts by weight of xanthan gum, 10 parts by weight of Xanthan gum and 10 parts by weight of the mixture during stirring at a rotational speed of 80 r / min. Potassium chloride and 8 parts by weight of polyvinyl alcohol, then close the mixing bin, turn on high-speed stirring, and collect the materials after mixing at 200 r / min for 2 hours, that is, the high-temperature isolation liquid suspension stabilizer prepared in this example, denoted as Sample II.

Embodiment 3

[0046] Weigh 74 parts by weight of attapulgite into the CM500-II powder mixer, turn on the motor, and slowly add 13 parts by weight of Wenlun gum, 5 parts by weight of xanthan gum, 5 Part by weight of sodium chloride and 3 parts by weight of hydroxyethyl cellulose, then close the mixing bin, turn on high-speed stirring, and mix at 190 r / min for 3 hours and then collect the materials, that is, the high-temperature isolation liquid prepared in this example is suspended and stable agent, denoted as sample III.

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Abstract

The invention provides a high-temperature spacer fluid suspension stabilizer for well cementation, a preparation method of the high-temperature spacer fluid suspension stabilizer and application of the high-temperature spacer fluid suspension stabilizer. The high-temperature spacer fluid suspension stabilizer for well cementation comprises the following ingredients in part by weight: 58-85 parts of clay substances, 8-20 parts of welan gum, 0-5 parts of xanthan gum, 5-10 parts of inorganic salt and 2-8 parts of high-molecular polymer. The high-molecular polymer comprises one or more than one of polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl starch ether. The suspension stabilizer serves as an additive and is added into spacer fluid; and after being added with the suspension stabilizer, the spacer fluid has high suspension stability, high consistency, high rheological property and high resistance to elevated temperature.

Description

technical field [0001] The invention relates to a high-temperature spacer fluid suspension stabilizer for cementing, a preparation method and application thereof, and belongs to the technical field of oilfield cementing spacer fluid. Background technique [0002] In oilfield cementing operations, drilling fluid and cement slurry are often incompatible. If the two are in direct contact, the fluid in the mixing section of the contact surface will thicken and flocculate, the fluid rheological properties will deteriorate, and the fluid friction and displacement will be reduced. The water conservancy parameters such as the return speed and the return speed will change accordingly, thus affecting the displacement efficiency of the fluid, and the resulting high pump pressure is very easy to leak the weak formation. In addition, the flocs in the drilling fluid adhere to the well wall and casing wall to easily form a virtual mud cake, which seriously affects the cementation quality o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40E21B33/13
CPCC09K8/40E21B33/13
Inventor 于永金靳建洲夏修建徐明刘硕琼袁进平齐奉忠张华刘子帅
Owner BC P INC CHINA NAT PETROLEUM CORP
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