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Blocking agent and application thereof

A technology of plugging agent and bridging agent, applied in the field of plugging agent, can solve problems such as the difficulty in controlling the temperature of gel material, the inability of coarse-grained plugging materials to enter the formation, and the difficulty in matching the particle size of bridge plugging materials.

Active Publication Date: 2019-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problems often encountered in the conventional bridging slurry plugging include: the natural fractures are irregular, which makes it extremely difficult to match the particle size of the bridging plugging materials, too fine plugging materials are easy to flow into the formation, and the coarse particle plugging materials cannot Into the formation; for ductile fracture leakage, even if the bridge plugging material configuration is reasonable, it will fail as the fracture expands; the physical filling structure is not strong, when the wellbore pressure fluctuates, the plugging agent will accumulate loosely and cause failure
The currently widely advocated gel plugging scheme has poor formation cementation, is difficult to withstand a temperature of 200°C, and has low strength, and it is difficult to control the temperature at which the gel begins to gel. Gelation has already begun without plugging, which will affect the performance of the drilling fluid itself
Among other plugging materials, only relying on hard fibers to seal cracks is likely to cause re-leakage, while plugging materials based on natural cellulose, such as walnut shells and various bamboo and wood fibers, are easy to carbonize and degrade at high temperatures, resulting in plugging Loss of strength leads to failure, prone to re-leakage, leading to crack opening, causing other unstabilized sealing layers to slip and fail

Method used

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  • Blocking agent and application thereof
  • Blocking agent and application thereof
  • Blocking agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Attapulgite powder: attapulgite powder containing dolomite in a mass content of 10% and having a particle size of 10 to 30 μm. Purchased from Anhui Boshuo Technology Co., Ltd. First of all, the microscopic morphology of the attapulgite used in this example dispersed in water was analyzed with a JEOL JSM-6701F cold field emission scanning electron microscope, and the analysis results are shown in figure 1 . From figure 1 It can be seen that the crystal part of the attapulgite is rod-shaped microscopically, with a relatively large major diameter and a diameter of 50 to 100 nm, so it is judged that it is easy to enter the fractures in the formation.

[0045] The particle sizes of melamine and cyanuric acid are 10 to 30 μm, respectively.

[0046] 100g of cyanuric acid and 100g of melamine were reacted in 50g of water at 170°C to form a crystallization agent, and the microscopic morphology, particle size distribution and temperature resistance characteristics were observe...

Embodiment 2

[0050] Attapulgite powder: attapulgite powder containing dolomite in a mass content of 20%, with a particle size of 30 to 50 μm. Purchased from Anhui Boshuo Technology Co., Ltd. After being dispersed in water, its diameter is 100 to 200 nm.

[0051] The particle sizes of melamine and cyanuric acid are 30 to 50 μm, respectively.

[0052] In the mixing tank, add 35kg of clear water, start the high-speed shear mixer at a speed of 8000rpm, add attapulgite powder 40kg, 12.2kg of melamine, 12.8kg of cyanuric acid, and 0.6kg of stearic acid in turn, and stir evenly to obtain a sealed Blocking agent 2#.

[0053] Put the prepared plugging agent 2 into the aging tank, raise the temperature to 210°C, heat for two hours, then cool down rapidly, filter the product, and observe the microscopic morphology of the filter cake, see Figure 8 , Figure 9 and Figure 10 .

[0054] After the man-made core has been processed to produce cracks, see Figure 11 and Figure 12 , put it into the a...

Embodiment 3

[0056] Attapulgite powder: attapulgite powder containing dolomite in a mass content of 5%, with a particle size of 20 to 30 μm. Purchased from Anhui Boshuo Technology Co., Ltd. After being dispersed in water, its diameter is 50 to 150 nm.

[0057] The particle sizes of melamine and cyanuric acid are 20 to 30 μm, respectively.

[0058] In the mixing tank, add 34.4kg of clear water, start the high-speed shear mixer at a speed of 2000rpm, add attapulgite powder 40kg, 12.2kg of melamine, 12.8kg of cyanuric acid, and 0.6kg of stearic acid in turn, and stir evenly to obtain Plugging agent 3#.

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Abstract

The invention provides a blocking agent and an application thereof. The blocking agent comprises a bridge agent, a crystallization generating agent, a crystalline control agent and water, and the crystallization generating agent includes melamine and cyanuric acid.

Description

technical field [0001] The invention provides a plugging agent and application thereof. Background technique [0002] In the ultra-deep well area, the depth can reach 7600-8800 meters, the temperature of the working face can reach 160-200 ℃, there are many complex formations, and the drilling cycle is long. The poor stability of the Paleozoic strata here restricts the safe well completion and drilling time efficiency. For example, the Permian igneous rock strata have developed fractures, and the leakage rate can be as high as 50% or even higher. At present, the problems often encountered in the conventional bridging slurry plugging include: the natural fractures are irregular, which makes it extremely difficult to match the particle size of the bridging plugging materials, too fine plugging materials are easy to flow into the formation, and the coarse particle plugging materials cannot For ductile fracture leakage, even if the bridge plugging material is properly configured...

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/10
Inventor 方俊伟李双贵贾晓斌耿云鹏范胜李银婷何仲沈青云方静易浩刘晓民
Owner CHINA PETROLEUM & CHEM CORP
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