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Drilling and solidifying integrated working fluid for improving two-interface cementation quality, and application method thereof

A technology of working fluid and interface glue, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of poor compatibility, deterioration of drilling fluid performance, and increase of drilling fluid viscosity, etc., to reduce The possibility of mutual channeling, beneficial to protection and discovery, and the effect of improving cementing quality

Pending Publication Date: 2019-09-20
胜利油田胜华实业有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although relevant and similar researches have been done in China, there are different degrees of poor compatibility between the added components and the original drilling fluid components, resulting in the deterioration of the drilling fluid performance, or even the inability to flow, increasing the viscosity of the drilling fluid, and forming a void. Thick mud cake not only cannot meet the technical requirements of long-term safe drilling, but also pollutes the oil and gas layers, forming an unreal thick mud cake that highlights the "sandwich sandwich cake" effect and further affects the cementation quality of the two interfaces

Method used

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  • Drilling and solidifying integrated working fluid for improving two-interface cementation quality, and application method thereof
  • Drilling and solidifying integrated working fluid for improving two-interface cementation quality, and application method thereof
  • Drilling and solidifying integrated working fluid for improving two-interface cementation quality, and application method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] The condition of the latent active material of embodiment 1 drill-solid integrated working fluid

[0042] The following conditions must be met for the selection of high-strength composite latent active cementitious materials that meet the drilling-solid integrated working fluid:

[0043] 1. The activity of materials is potential. Various mineral compositions are in a metastable state under a certain environment (normal temperature and pressure). Mineral active materials do not have a separate hydration ability, and all require specific media conditions (water, climate, thermal effects, Chemical substances, etc.) to stimulate its potential activity.

[0044] 2. Good compatibility with drilling fluid, no gelation, little impact on drilling fluid loss, no serious damage to drilling fluid performance, meeting the requirements of long-term drilling fluid circulation, no activation and solidification after long-term rolling at 150°C, no loss active.

[0045] 3. The activity...

Embodiment 2

[0054] Example 2 Potentially active material in drilling-solid integration PH control

[0055] Drilling fluid: Measure 500mL of 4% mud in the room, use Na 2 CO 3 , NaOH and HCL to the specified pH value, add 35% (accounting for the percentage of the mass of the soil slurry) active material under high-speed stirrer (1000r / min) stirring, and stop at least twice during the period to scrape off the phosphate attached to the container. For gelled material on the wall, shear force values ​​of the active material in bentonite slurries of different pH values ​​were determined. Experiments show that when the pH is in the range of 1 to 6, the mixed solution will flocculate to a certain extent, and the soil particles will coalesce; the shear force will change to a certain extent, and the shear force will not change much with the extension of time, and there will be no gelation and solidification after stirring . The performance of the slurry is stable within the pH range of 6 to 12.5,...

Embodiment 3

[0057] Embodiment 3 Curing evaluation under high temperature and high pressure containing latent active material

[0058] In order to evaluate the viscosity change of the working fluid under high temperature and high pressure, the high temperature and high pressure thickening instrument is used indoors to simulate the environment of 150°C / 60MPa and 170°C / 80MPa to conduct thickening experiments on the working fluid containing 5-25% latent active materials. The experimental results show that the working fluid containing latent active materials still maintains good rheological properties under high temperature and pressure conditions of 150°C / 60Mpa and 170°C / 80Mpa, and there is no solidification of the working fluid.

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Abstract

The invention discloses a drilling and solidifying integrated working fluid for improving two-interface cementation quality, and an application method thereof, wherein the integrated working fluid comprises, by weight, 100 parts of a drilling fluid, 5-15 parts of a composite latent active cementing material, a suitable amount of a pH value adjuster for controlling the pH value of the integrated working fluid at 7-11 during drilling, and a suitable amount of an alkaline activator for controlling the pH value of the integrated working fluid at more than 12 during well cementing. According to the present invention, the mud cake formed by the drilling fluid and the solidified body of the cell cementing fluid are converted into the continuous integration by the high-strength active material, wherein the continuous integration is the drilling fluid during the drilling, and the mud cake containing the latent active material can be activated and solidified under the activation of the activator after the drilling is completed and the bushing is arranged so as to eliminate the sandwich cake effect and effectively improve the two-interface cementation quality; and the remaining drilling fluid after the completion of the well cementing can be solidified in situ, and the drilling and cementing integrated technology meets the drilling requirements of well depth of 5000 m, temperature of 150 DEG C and formation pressure of 2.0 g / cm<3>.

Description

technical field [0001] The invention relates to the technical field of petroleum development technology, in particular to a drilling-solid integrated working fluid and an application method thereof for improving the bonding quality of two interfaces. Background technique [0002] With the sustained and rapid development of China's economy, the current oil and gas growth rate in China is far lower than the demand for economic growth, and the development of oil and gas resources in complex formations has become one of the important directions for seeking major breakthroughs in oil and gas in recent years. The oil and gas development of marginal oil and gas reservoirs, complex fault block oil and gas reservoirs, and complex special wells all face new issues of how to discover and protect oil and gas layers and improve recovery. Due to the particularity of complex oil and gas resources, if effective measures to protect oil and gas layers are not taken during the drilling and cem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/467E21B21/06E21B33/13
CPCC09K8/24C09K8/467E21B21/062E21B21/068E21B33/13
Inventor 王亚洲王治法吴长勇李彦操孙国友王青张斌谷万强王富伟杨立明李书明茹冰李雅松
Owner 胜利油田胜华实业有限责任公司
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