A kind of bridging plugging slurry and preparation method thereof

A technology for slurry leakage and asphalt layer, which is applied in the directions of chemical instruments and methods, drilling composition, etc., can solve the problem that leakage plugging slurry and asphalt channeling can not be effectively solved, and is not suitable for asphalt layer plugging, and the viscosity of leakage plugging slurry can not be effectively solved. It can improve the plugging effect, reduce the complexity and ensure the safety of drilling.

Active Publication Date: 2021-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with the publication number CN101435317A provides a formula for pre-crosslinked gel plugging slurry. The formula essentially uses gel for plugging. The plugging slurry has low viscosity and poor temperature resistance, which cannot effectively solve the problem of plugging. The problem of channeling and mixing of slurry and asphalt; the Chinese patent with publication number CN106609132A provides a preparation method and application of a multi-component composite gel plugging agent. The plugging agent integrates gel plugging and bridging plugging, and is essentially a A solidified plugging agent, the gel plays a role of consolidation, the gel and the bridging material work together to seal the lost layer, the effect is good, but its anti-channeling ability is poor, so it is not suitable for asphalt layer plugging

Method used

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Examples

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Effect test

preparation example Construction

[0042] The preparation method of the gel adopts the method of Example 8 in the Chinese patent publication CN106317321A, specifically comprising the following steps:

[0043] Add 17g of acrylamide, 4g of acryloyloxyethyltrimethylammonium chloride, and 0.2g of N,N'-methylenebisacrylamide into 100g of water, stir to fully dissolve, add 4g of ammonium alginate, stir to fully dissolve, add 0.5g of superfine calcium carbonate, stir to fully disperse, add 1g of ammonium persulfate and 1g of acetic acid, stir to dissolve fully, finally, place the mixed system at 55°C for reaction, and form a gel after 2 hours.

Embodiment 1

[0045] Formula: (unit is weight part)

[0046] Water: 100

[0047] Gels: 1

[0048] Calcium carbonate particles (1mm): 5

[0049] Walnut shell (0.5-1mm): 2

[0050] Suspension polymerization monoene-diene cross-linked gel resin (1mm): 0.5

[0051] Sepiolite fiber (0.5-1mm): 2

[0052] Mica (0.5mm): 2

[0053] Calcium carbonate powder (400 mesh): 5

[0054] Preparation method: Mix the gel with water to make a gel solution, add the above-mentioned other materials into the gel solution, stir at 4500r / min for 10min, prepare 1000mL gel plugging slurry according to the above formula, and set aside.

[0055] Test method: install a 1mm simulated fracture core in the DL-2 plugging instrument, fill the core fracture with 190g of asphalt, then add 1000mL gel plugging slurry and 1000mL drilling fluid into the DL-2 plugging instrument, and replace it with drilling fluid Gel plugging slurry. The core with simulated fractures was heated to 120°C and pressurized slowly. During the proce...

Embodiment 2

[0057] Formula: (unit is weight part)

[0058] Water: 100

[0059] Gels: 1

[0060] Clam shell powder (2mm): 6

[0061] Apricot shell (0.5-2mm): 2

[0062] EPDM and 4-tert-butylstyrene copolymer (1mm): 2

[0063] Aluminum silicate fiber (0.5-1mm): 2

[0064] Raw vermiculite (0.5mm): 2

[0065] Calcium sulfate powder (400 mesh): 5

[0066] Preparation method: mix the gel with water to make a gel solution, add other materials into the gel solution respectively, stir at 4500r / min for 10min, prepare 1000mL gel plugging slurry according to the above formula, and set aside.

[0067] Test method: install a 2mm simulated fracture core in the DL-2 plugging instrument, fill the core fracture with 380g of asphalt, then add 1000mL gel plugging slurry and 1000mL drilling fluid into the DL-2 plugging instrument, and replace it with drilling fluid Gel plugging slurry. The simulated fractured core was heated to 120°C and slowly pressurized. During the pressurization process, the aspha...

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Abstract

The invention relates to a bridging plugging slurry in the field of oil drilling plugging and a preparation method thereof. The bridging plugging slurry comprises the following components in parts by weight: 100 parts of water, 1 to 3 parts of gel, 4 to 15 parts of inorganic particle materials, 2 to 8 parts of plant-based hard shell materials, oil-swellable resin 0.5 to 5 parts, 1 to 4 parts of mineral fiber, 1 to 4 parts of sheet material, and 4 to 10 parts of powder material; Combined reaction, rapid thickening of viscosity; the bridging material used has a reasonable particle size, which can effectively seal the lost channel; combined with bentonite slurry, the plugging slurry can effectively seal the lost layer of asphalt-containing cracks of 1 to 5 mm , can effectively displace asphalt, the asphalt displacement rate reaches over 80%, and forms a plugging layer with a strength greater than 8MPa, and a temperature resistance of over 120°C; and the preparation method is simple and easy to operate on site.

Description

technical field [0001] The invention relates to the field of oil drilling plugging, and more particularly relates to a bridging plugging slurry and a preparation method thereof. Background technique [0002] During the drilling process of Yada Oilfield in Iran, some wells experienced severe leakage, and the asphalt in the formation invaded the drilling fluid, which seriously affected the normal maintenance of the drilling fluid performance. When the drilling fluid density is increased to kill the well, it cannot effectively prevent the asphalt from gushing out, but intensifies the amount of asphalt gushing out, and a large amount of asphalt adheres to the drill pipe, resulting in high drilling complexity; The plugging slurry and asphalt have mixed problems, and the plugging effect is not good. For the complex downhole situation caused by asphalt, most foreign countries adopt measures such as filling sidetracking to bypass the asphalt layer, using asphalt inhibitors to impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/487
CPCC09K8/426C09K8/487C09K2208/08
Inventor 刘金华金军斌何青水胡子乔杨顺辉孔勇赵向阳宋兆辉
Owner CHINA PETROLEUM & CHEM CORP
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