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A kind of cement gel material and its preparation method and application

A gel material and cement technology, applied in the field of cement gel material and its preparation, can solve the problems of inability to control annular pressure, reduce gas well annular pressure, reduce casing corrosion rate, etc., and achieve early cement hydration. Effect of induction period, improving compressive strength and accelerating cement hydration process

Active Publication Date: 2021-10-22
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese Patent CN107163922A "A Protection Liquid for Preventing Annular Pressure and Its Preparation Method" discloses that the protection liquid contains a plugging agent, so it has the function of automatically sealing the hidden danger of leakage. At the same time, the protection liquid has a good bactericidal effect and can effectively reduce the corrosion rate of casing; Chinese patent CN106761568A provides a method for controlling gas well annulus under pressure, through supplementary injection of supplementary annulus protective fluid with a density greater than gas production in the gas well annulus of annulus under pressure gas wells, preventing gas wells from The gas produced in the production string leaks into the annulus of the gas well, thereby reducing the annulus pressure of the gas well in the gas well with pressure in the annulus. This method can remove the pressure in the annulus of the gas well and keep it in a stable state for a long time when the gas well does not stop production , to improve the safety of natural gas well production operations; Chinese patent CN108252684A provides a method and device for controlling pressure in the wellhead annulus, and injects cement slurry and sealant into the wellbore through a specific device to solve the problem of wellhead annular pressure; However, the methods introduced in the above-mentioned patents all have certain shortcomings and deficiencies, or they focus on prevention, and can only prevent annulus pressure to a certain extent, and cannot solve the problem of annulus pressure in the later stage; or they are only aimed at the annulus of conventional gas wells Underpressure treatment is not suitable for annulus underpressure treatment of shale gas wells in low-temperature environments (environment temperature is lower than 10°C); or the process is relatively complicated, and the conventional cement slurry system used has a long setting time and poor anti-gas channeling effect

Method used

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  • A kind of cement gel material and its preparation method and application
  • A kind of cement gel material and its preparation method and application
  • A kind of cement gel material and its preparation method and application

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preparation example Construction

[0041] The present invention provides the preparation method of the cement gel material described in the above technical solution, comprising the following steps:

[0042] (1) mixing cement with dispersant to obtain solid mixture;

[0043] (2) mixing defoamer, nano-filler, early strength agent and water to obtain a mixed solution;

[0044] (3) mixing the solid mixture described in step (1) and the mixed solution described in step (2) to obtain a cement gel material;

[0045] The steps (1) and (2) are not in chronological order.

[0046] The present invention mixes cement and dispersant to obtain a solid mixture. The present invention has no special requirements for the mixing method, and the cement and the dispersant can be mixed uniformly.

[0047] In the present invention, the defoaming agent, the nano-filling agent, the early strength agent and the water are mixed to obtain a mixed solution. In the present invention, the mixing is preferably performed under stirring con...

Embodiment 1

[0052] In parts by weight, 100 parts of oil well G-grade cement and 0.04 part of dispersant were mixed to obtain a solid mixture; 0.4 part of defoamer, 0.95 part of nano-filler with a particle size of 10-15 nm, and 4 parts of a particle size of 5-15 nm were mixed The calcium silicate hydrate was mixed with 37.7 parts of fresh water, and stirred at 4000r / min for 50s to obtain a mixed solution;

[0053] After the solid mixture and the mixed solution are obtained, the solid mixture is added to the stirring cup containing the mixed solution within 15s at a rotating speed of 4000r / min, and the cement gel material is obtained by stirring at a high speed for 35s at a rotating speed of 12000r / min.

Embodiment 2

[0055] The preparation process is basically the same as that of Example 1, except that, based on the parts by weight of cement, the addition amount of the calcium silicate hydrate is 8 parts, and the fresh water is 33.7 parts.

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Abstract

The invention provides a cement gel material and its preparation method and application, belonging to the technical field of cementing. The invention provides a cement gel material, which comprises the following preparation raw materials in parts by weight: 100 parts of cement; 0.04 to 0.1 parts of dispersant; 0.2 to 2 parts of defoaming agent; 0.5 to 1.5 parts of nano filler; 4 to 16 parts; 25.2 to 41.9 parts of water. The invention takes cement as the main body, and under the action of dispersant, defoamer, nano filler and early strength agent, it has excellent rheological properties and strong permeability, and can well fill the gaps or cracks of the cement sheath, and play a role To restore the integrity of the wellbore; the cement gel material provided by the invention has a short thickening and transformation time, can effectively prevent gas channeling during the solidification process, and can quickly seal the annular wellhead with pressure problems under low temperature conditions part.

Description

technical field [0001] The invention relates to the technical field of cementing, in particular to a cement gel material and a preparation method and application thereof. Background technique [0002] Shale gas refers to unconventional natural gas stored in organic mud shale and its interlayers, mainly in adsorption and free states. The success of shale gas exploration and development is of great significance to the adjustment of the world's energy structure. Shale gas reservoirs have the characteristics of low porosity and low permeability, and it is necessary to perform perforating, fracturing and other measures to obtain higher production. In the process of perforating, fracturing and other stimulation measures, cementing The cement sheath has to withstand a huge impact force in an instant. Under the action of the impact force, the cement sheath with extremely high brittleness is prone to microscopic cracks, which develop into macroscopic cracks over time, resulting in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 许明标王晓亮张敏
Owner JINGZHOU JIAHUA TECH