Gel plugging agent for oil-based drilling fluid, and preparation method thereof

A technology of oil-based drilling fluid and plugging agent, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor resistance to oil invasion, and achieve adjustable gel strength, oil resistance and salt resistance. Improved, good rheological effect

Active Publication Date: 2019-08-20
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current polymer gels use water as the continuous phase, have poor resistance to oil erosion, and are only suitable for use in water-based drilling fluids

Method used

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  • Gel plugging agent for oil-based drilling fluid, and preparation method thereof
  • Gel plugging agent for oil-based drilling fluid, and preparation method thereof
  • Gel plugging agent for oil-based drilling fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A gel plugging agent for oil-based drilling fluid comprising the following components in parts by mass: 3 parts of sodium dodecylbenzenesulfonate, 5 parts of diesel oil, 2 parts of sodium bentonite, 8 parts of N-methylolacrylamide 24 parts of acrylamide, 5 parts of oil well cement, 5 parts of barite, and 100 parts of water.

[0030] The preparation method of the gel plugging agent for oil-based drilling fluid comprises the following steps:

[0031] (1) Under stirring at a speed of 11000r / min in water, add sodium dodecylbenzenesulfonate, and continue to stir at 11000r / min for 8min;

[0032] (2) At 2500r / min, add diesel oil and stir at 11000r / min for 18min;

[0033] (3) Add sodium bentonite, N-methylolacrylamide and acrylamide at 2500r / min, and stir at 11000r / min for 22min;

[0034] (4) At 2500r / min, add oil well cement and barite, and stir at 11000r / min for 30min to obtain the product.

Embodiment 2

[0036] A gel plugging agent for oil-based drilling fluids, comprising the following components in parts by mass: 5 parts of sodium cetylbenzenesulfonate, 15 parts of white oil, 4 parts of sodium bentonite, N,N-2 methylol 12 parts of acrylamide, 36 parts of acrylamide, 1 part of hydroquinone, 15 parts of oil well cement, 10 parts of ilmenite, and 100 parts of water.

[0037] The preparation method of the gel plugging agent for oil-based drilling fluid comprises the following steps:

[0038] (1) Under stirring at a speed of 13000r / min in water, add sodium cetylbenzenesulfonate, and continue to stir at 13000r / min for 12min;

[0039] (2) At 3500r / min, add white oil and stir at 13000r / min for 18min;

[0040] (3) Add sodium bentonite, N,N-2 methylol acrylamide, acrylamide and hydroquinone at 3500r / min, and stir at 13000r / min for 22min;

[0041] (4) Add oil well cement and ilmenite at a rotational speed of 3500r / min, and stir at 13000r / min for 30min to obtain the product.

Embodiment 3

[0043] A gel plugging agent for oil-based drilling fluid comprising the following components in parts by mass: 4 parts of sodium stearate, 10 parts of diesel oil, 3 parts of sodium bentonite, 10 parts of N-methylolacrylamide, acrylamide 25 parts, 0.05 parts of p-methoxyphenol, 10 parts of oil well cement, 8 parts of hematite, and 100 parts of water.

[0044] The preparation method of the gel plugging agent for oil-based drilling fluid comprises the following steps:

[0045] (1) Under stirring in water at a speed of 12000r / min, add sodium stearate, and continue stirring at 12000r / min for 10min;

[0046] (2) Under the rotating speed of 3000r / min, add diesel oil and stir for 20min at 12000r / min;

[0047] (3) Add sodium bentonite, N-methylolacrylamide, acrylamide and p-methoxyphenol at 3000r / min, and stir at 12000r / min for 20min;

[0048] (4) At 3000r / min, add oil well cement and hematite, and stir at 12000r / min for 30min to obtain the product.

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Abstract

The invention provides a gel plugging agent for an oil-based drilling fluid, and a preparation method thereof. The plugging agent comprises, by mass, 3-5 parts of an oil-in-water surfactant, 5-15 parts of oil, 2-4 parts of sodium bentonite, 8-12 parts of a crosslinking agent, 24-36 parts of a gelling agent, 0-1 part of a retarder, 5-15 parts of a reinforcing agent, 5-10 parts of a weighting agentand 100 parts of water. An excess amount of the oil-in-water surfactant and a small amount of the oil are added to the gel plugging agent to make the gel plugging agent has excellent resistance to oilintrusion, and are further combined with the sodium bentonite, the crosslinking agent, the gelling agent and the retarder to form the chemical gel plugging agent with a strong plugging property, anddifferent gelling time and strengths can be selected according to different leakage characteristics and leakage formation needs.

Description

technical field [0001] The invention relates to a plugging agent for petroleum drilling fluid, in particular to a gel plugging agent for oil-based drilling fluid. Background technique [0002] Lost circulation is a common problem in drilling and workover operations. The reasons for lost circulation are very complicated, usually due to low formation pressure, high drilling fluid density, high operating pressure, formation cracks, holes, caves, and water-producing layers. and other problems. Lost circulation, especially those caused by complex conditions such as hole type and fracture type, often cause significant economic losses. At present, for the general leakage problem, the use of traditional plugging methods and materials (bridge plugging, cement slurry plugging) can basically block the leakage, but under complex formation conditions, the traditional method often cannot prevent leakage or repeats after plugging. missing. The phenomenon of well abandonment caused by lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 于铁峰赵宇光黄生松于培志潘谊党
Owner BC P INC CHINA NAT PETROLEUM CORP
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