Inorganic organic interpenetrating network oil well cement anti-channeling agent, preparation method and cement slurry

A technology of interpenetrating network and oil well cement, which is applied in the preparation method and cement slurry, and the field of inorganic organic interpenetrating network oil well cement anti-channeling agent, which can solve the problems of difficult construction on site, high construction risk, filling "sausage" and so on. Wide temperature range, improved anti-channeling performance, improved adhesion effect

Active Publication Date: 2021-04-27
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used oil well anti-channeling agents in China include foam cement, thixotropic agent, latex, expansion agent, impermeable cement, etc., but these have certain limitations and shortcomings
Most of the foam cement slurry system and expansion cement slurry system can only be used for medium and low temperature well cementing, and are rarely used for high temperature and high pressure oil and gas wells. Moreover, the construction process of the foam cement slurry system is relatively complicated, which brings certain difficulties to the on-site construction
The thixotropic agent has a certain anti-gas channeling effect, but the construction risk is relatively high. Once the pump is stopped halfway, it may cause the pump to be blocked or the "sausage" accident
The use of latex is restricted due to environmental pollution

Method used

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  • Inorganic organic interpenetrating network oil well cement anti-channeling agent, preparation method and cement slurry

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preparation example Construction

[0033] On the other hand, based on the same inventive concept, the embodiment of the present application provides a preparation method of the above-mentioned inorganic-organic interpenetrating network oil well cement anti-channeling agent, such as figure 1 As shown, it specifically includes the following steps:

[0034] Step S110: dissolving the organic polymer in water to form a polymer solution with a concentration of 6%-8%;

[0035] Among them, the concentration of the polymer solution is selected to be 6%-8%. On the one hand, it is limited by the dissolving ability of the polymer; middle.

[0036] The organic polymer is any one of polyvinyl alcohol or polyacrylamide. Preferably, the degree of polymerization of the polyvinyl alcohol is 1700-1800, and the degree of alcoholysis is 88% or 99%; the polyacrylamide is anionic.

[0037] Step S120: heating the polymer solution to 50-60°C, adjusting the pH value to 1.5-2.0, adding an initiator, and adding inorganic SiO while stir...

Embodiment 1

[0048] Take 10g of polyvinyl alcohol 1788, dissolve it in water to form a polymer solution with a concentration of 8%, heat it to 50°C, add hydrochloric acid, adjust the pH value to 1.5, add 0.1g of potassium persulfate, after the potassium persulfate is dissolved, stir Add 4.0g SiO in the process 2 Sol, silica sol solid content 20%, SiO 2 The particle size is 10nm, keep it for 30min, lower the temperature to 30°C, add ammonia water dropwise until the neutralization pH is 7.0, and obtain the inorganic organic interpenetrating network polymer anti-channeling agent, the code is G01.

[0049] The anti-channeling agent G01 obtained in this example is added to the cement slurry in an amount of 2%, and the cement slurry formula is: 100 g of G grade high sulfur-resistant cement, 4 g of fluid loss reducer BXF-200L (AF), anti-channeling Agent G01 2g, water 40g. To evaluate the anti-channeling performance, the test standard is the industry standard SYT 5504.5-2010 "Evaluation Method f...

Embodiment 2

[0053] Take 10g of polyvinyl alcohol 1788, dissolve it in water to form a polymer solution with a concentration of 7%, heat it to 55°C, add hydrochloric acid, adjust the pH value to 1.8, add 0.13g of ammonium persulfate, after the ammonium persulfate is dissolved, stir Add 3.0g SiO in the process 2 Sol, silica sol solid content 30%, SiO 2 The particle size is 20nm, keep it for 33min, lower the temperature to 30°C, add ammonia water dropwise until the neutralization pH is 7.0, and obtain the inorganic organic interpenetrating network polymer anti-channeling agent, the code is G02.

[0054] The anti-channeling agent G02 obtained in this example is added to the cement slurry in an amount of 2%, and the cement slurry formula is the same as in Example 1, only G01 in the example formula is replaced with G02. Anti-channeling performance is evaluated, the test method is the same as that of Example 1, and the results are shown in Table 2.

[0055] Table 2 Evaluation of anti-channelin...

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Abstract

The invention discloses an inorganic-organic interpenetrating network oil well cement anti-channeling agent, a preparation method and cement slurry, belonging to the field of oil well cement admixtures. The anti-channeling agent adopts inorganic SiO 2 The sol and the organic high molecular polymer are made of raw materials, and the mass ratio thereof is 0.2-0.4:1; wherein, the organic high molecular polymer is a water-soluble polymer. The preparation method is as follows: dissolving an organic high molecular polymer in water to form a polymer solution with a concentration of 6%-8%; heating the polymer solution to 50-60°C, adjusting the pH value to 1.5-2.0, adding triggering agent, adding inorganic SiO while stirring 2 Sol, heat preservation reaction; after the reaction is completed, the temperature is lowered to room temperature, and the pH is adjusted to neutral to form the inorganic-organic interpenetrating network oil well cement anti-channeling agent. The anti-channeling agent can improve the anti-channeling ability of cementing cement slurry, prevent channeling during well cementing construction, and has a wide range of applicable temperatures.

Description

technical field [0001] The invention relates to the field of oil well cement admixtures, in particular to an inorganic-organic interpenetrating network oil well cement anti-channeling agent, a preparation method and cement slurry. Background technique [0002] In oil and gas well cementing operations and other underground cementing operations, it is usually required to inject cement slurry containing cement, water and admixtures into the predetermined formation underground through surface pumping equipment to seal the annulus between the formation and the casing . Typically cement slurry is pumped into the casing and returns to the annulus through the gap between the casing and the formation. The cement slurry solidifies in the annulus to form a hard cement sheath, which can form a bond with the formation and the casing, that is, well cementing. In order to achieve a satisfactory cementing operation, it is necessary to achieve a high-strength cement to prevent fluid channe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 滕兆健赵岳汤少兵冯望生霍明江张维滨王海平侯薇谭文礼
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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