High strength heat resistant bridging plugging agent and preparation method thereof

A high-strength, leakage agent technology, applied in the field of oil drilling, can solve the problems of leakage of the lost layer, low temperature and pressure resistance, and reduced pressure bearing capacity.

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insufficient temperature and pressure resistance of the bridging materials, the strength of the formed sealing wall is insufficient and the pressure-bearing capacity is low, so that the pressure-bearing sealing of many high-pressure differential intervals cannot meet the design requirements, which affects the next drilling. Drilling wells in high-pressure formations are under normal operation
The bridging materials in the current bridge plugging materials are basically fruit shells represented by walnut shells, and the compressive strength of walnut shells soaked in aqueous solution or mud for one day is 6.22MPa, so a single If the pressure requirement of bridge slurry plugging exceeds 6MPa, the probability of successful plugging is very small
For some lost well sections, bridging plugging technology is generally used to solve the problem of lost circulation. However, due to the low temperature and pressure resistance of the bridging materials in the bridging materials, the formed plugging layer will be formed after a period of time under the temperature and pressure at the bottom of the well. , the strength will gradually weaken, and the pressure bearing capacity will decrease, which will eventually lead to the failure of the sealing layer formed by bridging, and the re-leakage of the leakage layer

Method used

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  • High strength heat resistant bridging plugging agent and preparation method thereof
  • High strength heat resistant bridging plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Base slurry: bentonite 5; sodium carbonate (Na 2 CO 3 ): 0.25; water: 100.

[0049] Plugging material:

[0050] Engineering Polypropylene: 5;

[0051] Feldspar: 50;

[0052] EPDM: 6;

[0053] 3mm polyester fiber (diameter range 13-21μm): 0.5;

[0054] Shielding temporary blocking agent PB-1:20.

[0055] The engineering polypropylene, EPDM and feldspar are pulverized into particles with a particle size distribution range of 0.1 mm to 2 mm.

[0056] Na 2 CO 3Add in water, stir evenly, add bentonite, stir for 30 minutes, let stand at 25°C for 24 hours, then add shielding temporary plugging agent PB-1 into the prepared base slurry, stir for 10 minutes, then add other plugging components in sequence , and stirred for 10 min, to obtain a plugging slurry. Experiments were carried out with a high-temperature, high-pressure pressure-bearing plugging experimental device, and the temperature was set at 150°C. The plugging slurry can effectively plug artificial cracks wit...

Embodiment 2

[0058] Base pulp: bentonite 5; Na 2 CO 3 : 0.25; water: 100.

[0059] Engineering polypropylene: 7;

[0060] Feldspar: 55;

[0061] EPDM: 8;

[0062] 3mm polypropylene fiber (diameter range 13-21μm): 0.5;

[0063] Shielding temporary blocking agent PB-1:20.

[0064] The engineering polypropylene, EPDM and feldspar are pulverized into particles with a particle size distribution range of 0.1 mm to 3 mm. Na 2 CO 3 Add in water, stir evenly, add bentonite, stir for 30 minutes, let stand at 25°C for 24 hours, then add shielding temporary plugging agent PB-1 into the prepared base slurry, stir for 10 minutes, then add other plugging components in sequence , and stirred for 10 min, to obtain a plugging slurry. Experiments were carried out with a high-temperature and high-pressure pressure-bearing plugging experimental device, and the temperature was set at 150°C. The plugging slurry can effectively plug artificial cracks with a width of 3 mm. The pressure was slowly increase...

Embodiment 3

[0066] Base pulp: bentonite 5; Na 2 CO 3 : 0.25; water: 100.

[0067] Engineering polypropylene: 10;

[0068] Feldspar: 69;

[0069] EPDM: 12;

[0070] 5mm polyester fiber (diameter range 13-21μm): 0.6;

[0071] Shielding temporary blocking agent PB-1:20.

[0072] The engineering polypropylene, EPDM and feldspar are pulverized into particles with a particle size distribution range of 0.1 mm to 4 mm.

[0073] Na 2 CO 3 Add in water, stir evenly, add bentonite, stir for 30 minutes, let stand at 25°C for 24 hours, then add shielding temporary plugging agent PB-1 into the prepared base slurry, stir for 10 minutes, then add other plugging components in sequence , and stirred for 10 min, to obtain a plugging slurry. Experiments were carried out with a high-temperature, high-pressure pressure-bearing plugging experimental device, and the temperature was set at 150°C. The plugging slurry can effectively plug artificial cracks with a width of 4mm. Slowly pressurize at a speed ...

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Abstract

The invention discloses a high strength heat resistant bridging plugging agent and a preparation method thereof. The plugging agent comprises, calculated by a total water content of 100 weight parts in a basic slurry, basic slurry, 5-15 parts of engineering propene polymer, 50-80 parts of feldspar, 5-15 parts of ethylene-propylene-diene monomer, 0.5-1 part of fiber and 10-20 parts of temporary plugging agent PB-1. The preparation method comprises steps of: a. adding shield temporary plugging agent PB-1 into the basic slurry and stirring uniformly; b. adding the engineering propene polymer, feldspar, ethylene-propylene-diene monomer and fiber respectively and stirring uniformly to obtain the high strength heat resistant bridging plugging agent. The plugging agent of the invention can solvea problem of continuous bearing of a leaking stratum under a high temperature condition, satisfy long time high temperature and high bearing requirements and guarantee safe operation of subsequent well drilling construction.

Description

technical field [0001] The invention relates to the field of petroleum drilling, and more specifically relates to a high-strength temperature-resistant bridging plugging agent and a preparation method thereof. Background technique [0002] In recent years, the importance of petroleum in economic activities has become more and more important. The exploration area has been expanding continuously, and the geological conditions encountered have become more and more complex. As a direct verification of exploration results, drilling projects are also facing more and more challenges. , well leakage is one of them. Lost circulation will not only consume drilling time and loss of drilling fluid, but also may cause a series of complex situations such as sticking, blowout, and collapse. In severe cases, the wellbore will be scrapped and cause huge economic losses. From Table 1, we can know the parameters of different lost circulations by category. Micro-leakage and small leakage can b...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C09K8/42
Inventor刘四海赵素丽刘金华石秉忠张凤英江山红李胜
OwnerCHINA PETROLEUM & CHEM CORP