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Well cementation composite plugging spacer fluid system and application thereof

A technology of isolation fluid and system, applied in the field of petroleum exploration, can solve the problem of ineffective plugging effect of cavities or broken formations, etc.

Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the plugging pre-fluid system has a good plugging effect for porous and fractured formations, but limited by the particle size and compound concentration of plugging materials, its plugging effect is not good for porous or fractured formations. Significantly, it is necessary to further develop the cementing composite plugging and isolation fluid system based on new expansion materials

Method used

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  • Well cementation composite plugging spacer fluid system and application thereof
  • Well cementation composite plugging spacer fluid system and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0064] Preparation method of raw material:

[0065] 1. Preparation method of polyethylene temperature-sensitive expansion material with a temperature-sensitive point of 150°C

[0066] Mix 50mL of liquid paraffin with 3mL of compound emulsifier, stir at room temperature until the emulsifier and oil-soluble solvent are completely mixed to form an oil phase; put 0.5g of polyvinyl alcohol and 1g of N-isopropylacrylamide into 10mL of deionized water, and Stir for 10 minutes until the polyvinyl alcohol and N-isopropylacrylamide are completely dissolved, add 0.25mL hydrochloric acid and 0.25mL glutaraldehyde to form a water phase; slowly drop the water phase into the oil phase under stirring at room temperature, and stir for 10 minutes to reach the water phase Evenly dispersed in the oil phase. After heating at 150°C for 30min, slowly add 0.1mL tetraethylenepentamine dropwise to the oil phase, then add 0.04g dibenzoyl peroxide, continue to react for 3h, centrifuge after reaction, wa...

Embodiment 1

[0078] (1) Weigh 500g of fresh water, 15g of polyethylene temperature-sensitive swelling fine particles (the temperature-sensitive point of the particles is 150°C, the mesh size is 4-400 mesh), 7.5g of polyethylene temperature-sensitive swelling fibers (the temperature-sensitive point of the fibers is 150°C, the length 0.05-10cm, diameter 5-300μm), polypropylene microfiber 1.5g, weighting agent 300g, high temperature suspension stabilizer 50g, high temperature retarder 5g, defoamer 1.5g.

[0079] (2) Mixing the weighed temperature-sensitive expandable fine particles, temperature-sensitive expandable fibers, fine fibers and weighting agent uniformly to obtain a mixed powder.

[0080] (3) Mix the weighed fresh water, high-temperature suspension stabilizer, high-temperature retarder and defoamer evenly to obtain a mixed liquid.

[0081] (4) In the mixing container, add the mixed liquid, the agitator rotates at a low speed (4000±200 rpm), and within 15 seconds, the mixture is even...

Embodiment 2-3

[0083] The only difference from Example 1 is that the content of the slag weighting agent used is 475g and 725g respectively, and the obtained density is respectively 1.40g / cm 3 and 1.50g / cm 3 The cementing composite plugging spacer fluid system.

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Abstract

The invention relates to a well cementation composite plugging spacer fluid system, which comprises water, temperature-sensitive expanded fine particles, temperature-sensitive expanded fibers, fine fibers and a weighting agent. According to the well cementation composite plugging spacer fluid system, on the premise that the pumpability of fluid is guaranteed, the bridging and deformation filling capacity of spacer fluid is improved, the plugging effect is enhanced, the pressure bearing capacity of malignant leakage stratums is improved, a good wellbore environment is provided for well cementation construction, and the well cementation composite plugging spacer fluid system has good application and popularization value.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and in particular relates to a cementing composite plugging and spacer fluid system and its application. Background technique [0002] In drilling engineering, when drilling natural fractures, porous or fractured formations, due to the low pressure bearing capacity of the open hole section of the wellbore, during the cementing cement slurry injection process, loss of return is very likely to occur, resulting in cement return. High enough to seriously restrict the cementing quality. In view of the problem of vicious leakage in well cementing, on the basis of improving the pressure bearing capacity of the formation and optimizing the performance of cement slurry for plugging, it is necessary to further adopt a plugging fluid system to plug the easy-to-lose layers in the open hole section and provide cement slurry injection. Relatively good wellbore condition. [0003] At present, the main met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/467
CPCC09K8/426C09K8/467C09K2208/08Y02W30/91
Inventor 陆沛青周仕明杨广国高元桑来玉刘学鹏初永涛
Owner CHINA PETROLEUM & CHEM CORP