A self-healing material for oil well micro-fractures and its preparation method

A technology of micro-fractures and composite materials, applied in the field of oil drilling and cementing, can solve problems such as unfavorable industrial production, difficult preparation of microcapsules, and aging of wall materials, so as to improve the integrity of the cement sheath, avoid the risk of secondary cementing, and prevent The effect of channeling

Active Publication Date: 2022-03-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of microcapsules is relatively difficult, which is not conducive to industrial production
Moreover, since the wall material of the microcapsule is made of organic polymer, the wall material may be aged

Method used

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  • A self-healing material for oil well micro-fractures and its preparation method
  • A self-healing material for oil well micro-fractures and its preparation method
  • A self-healing material for oil well micro-fractures and its preparation method

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preparation example Construction

[0043] On the other hand, an embodiment of the present invention provides a method for preparing the above oil well micro-fracture self-healing material, comprising the following steps:

[0044] (1) Divide water into two parts of equal quality water;

[0045] (2) dissolving nano silicon dioxide into one part of the water;

[0046] (3) dissolving sodium silicate, magnesium oxide and fumaric acid into another part of water;

[0047] (4) Mix the dispersant and fluid loss reducer with cement and stir until uniform;

[0048] (5) Mix and stir the two aqueous solutions obtained in (2) and (3) evenly; mix with the cement mixture obtained in (4) to obtain an oil well micro-fracture self-healing material.

[0049] Optionally, the preparation method of the oil well microfracture self-healing material consists of the above steps.

[0050] In the embodiment of the present invention, the mixing process refers to the oil well cement test method GBT19139-2003.

[0051] In the embodiment o...

Embodiment 1

[0058] Example 1 A microcrack self-healing material was prepared according to the following steps.

[0059] 1. Weigh two parts of water, each 21g;

[0060] 2. Dissolve nano-silica with a mass of 0.5g and a particle size of 20nm in one part of the water, and stir until it is evenly dispersed;

[0061] 3. Dissolve 1g of sodium silicate, 0.2g of magnesium oxide and 0.3g of fumaric acid at a calcination temperature of 1100°C and a calcination time of 200s into another portion of water;

[0062] 4. Mix 0.2g sodium lignosulfonate and 0.8g carboxymethyl hydroxyethyl cellulose with 100g G-grade high sulfur-resistant oil well cement and stir until uniform;

[0063] 5. Mix and stir the two aqueous solutions obtained in steps 2 and 3; mix with the cement mixture obtained in step 4 to obtain self-healing composite material cement slurry, and refer to the oil well cement test method GB / T 19139-2003 for the mixing process .

[0064] Pour the cement slurry into a cylindrical mold of 25mm×...

Embodiment 2

[0066] Example 2 A microcrack self-healing material was prepared according to the following steps.

[0067] 1. Weigh two parts of water, each 23g;

[0068] 2. Dissolve 1.5g of nano-silica with a particle size of 80nm in one part of the water, and stir until it is evenly dispersed;

[0069] 3. Dissolve 2g of sodium silicate, 0.6g of magnesium oxide and 0.9g of fumaric acid at a calcination temperature of 1200°C and a calcination time of 240s into another portion of water;

[0070] 4. Mix 0.4g sodium polystyrene sulfonate and 1.4g polyvinyl alcohol with 100g G-grade high sulfur-resistant oil well cement and stir until uniform;

[0071] 5. Mix and stir the two aqueous solutions obtained in steps 2 and 3 until uniform; mix with the cement mixture obtained in step 4 to obtain self-healing composite material cement slurry, and refer to the oil well cement test method GBT 19139-2003 for the mixing process .

[0072] Pour the cement slurry into a cylindrical mold of 25mm×50mm×25mm,...

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Abstract

A self-healing material for oil well micro-fractures and a preparation method thereof. The self-healing material includes the following components: cement, nano silicon dioxide, sodium silicate, magnesium oxide, fumaric acid, dispersant, reducing dehydrating agent and water. The preparation method of the self-healing material comprises the following steps: firstly, divide the water into two parts of equal mass water; then dissolve nano silicon dioxide into one part of the water; Dissolve the diacid in another part of water; then, mix the dispersant and fluid loss reducer with the cement and stir until uniform; finally mix the two aqueous solutions obtained and stir evenly; mix with the cement mixture to obtain a self-healing composite Material grout. The self-healing composite material prepared by the invention has the advantages of simple preparation method, simple operation and cheap raw materials; it can have a certain degree of self-repair ability when formation water invades oil well cement micro-cracks, and can ensure the safe production of the oil well.

Description

technical field [0001] This article relates to oil drilling and cementing technology, especially a self-healing material for oil well micro-fractures and its preparation method. Background technique [0002] The cementing project is a key link between drilling operations and oil and gas resource extraction. The procedure includes running a casing of a certain specification downhole, and injecting cement slurry into the annular space between the casing and the well wall after the casing is run. The injected cement slurry, a hydraulic cementitious material, solidifies and hardens into a cement sheath within a certain period of time. The role of the cement sheath includes supporting the casing and preventing formation fluid from corroding the casing, sealing off complex formations such as leakage layers and collapsed layers, and sealing off oil, gas and water layers to lay the foundation for stratified development of resources. A high-quality cement sheath should maintain long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/487C04B111/72
CPCC04B28/00C09K8/487C04B2111/72C04B2111/00724C04B14/06C04B22/00C04B22/066C04B24/04C04B2103/408C04B24/383C04B24/2623C04B2103/302
Inventor 赵军杨威方国伟邱汇洋房恩楼王清顺李成雷霆
Owner CHINA NAT OFFSHORE OIL CORP
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