Environmentally-friendly low-fluorescence imitation asphalt plugging agent

A plugging agent, polyethylene glycol technology, applied in the field of oil drilling, can solve the problems of unsatisfactory anti-slump plugging, high fluorescence level, limited plugging effect, etc.

Active Publication Date: 2019-03-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Asphalt is currently recognized as an ideal anti-slump agent, but for drilling in new areas, asphalt-based anti-slump agents are banned by geological departments due to their high fluorescence levels. In addition, asphalt-based plugging agents are highly toxic and difficult to biodegrade; emulsified paraffin waxes are effective The content is low, the plugging effect is limited, and the particles produced by the phase transition of polymeric alcohols due to the cloud point effect are too few, which cannot meet the needs of anti-slump plugging. Emulsified paraffin and polymeric alcohols mainly play the role of lubrication and partial inhibition

Method used

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  • Environmentally-friendly low-fluorescence imitation asphalt plugging agent
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  • Environmentally-friendly low-fluorescence imitation asphalt plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Plugging agent a is composed of the following components in various mass percentages:

[0032] Polyamide wax powder 10%,

[0033] Oxidized Polyethylene Wax 20%,

[0034] PAC 5%,

[0035] Macrogol 20%,

[0036] Sodium dodecylbenzenesulfonate 2%,

[0037] Nano calcium carbonate 10% with a particle size of 40-70nm,

[0038] The balance is water.

[0039] Put the above components into the reaction kettle one by one according to the above arrangement order. After heating up to 120°C, stir at a constant temperature for 60 minutes. After all the components are completely mixed evenly, then cool down to normal temperature and pressure and stir at a high speed. Discharge after 30 minutes, dry at 120°C for 180 minutes, pulverize and granulate, and pass through a 200-mesh sieve.

Embodiment 2

[0041] The plugging agent b is composed of the following components in various mass percentages:

[0042] Polyamide wax powder 15%,

[0043] Oxidized Polyethylene Wax 25%,

[0044] PAC 8%,

[0045] Macrogol 25%,

[0046] Sodium dodecylbenzenesulfonate 3%,

[0047] Nano calcium carbonate 15% with a particle size of 40-70nm,

[0048] The balance is water.

[0049] The preparation method is the same as in Example 1, only the dosage of each component is replaced accordingly.

Embodiment 3

[0051] The plugging agent c is composed of the following components in various mass percentages:

[0052] Polyamide wax powder 20%,

[0053] Oxidized Polyethylene Wax 20%,

[0054] PAC 5%,

[0055] Macrogol 20%,

[0056] Sodium dodecylbenzenesulfonate 5%,

[0057] Nano calcium carbonate 15% with a particle size of 40-70nm,

[0058] The balance is water.

[0059] The preparation method is the same as in Example 1, only the dosage of each component is replaced accordingly.

[0060] Examples 1-3 According to the prepared environmentally friendly and easy-degradable imitation asphalt low-fluorescence plugging agent, the drilling fluid was prepared according to the following procedures and its performance was tested. For specific performance tests, refer to GB / T 16783.1-2006 Petroleum and Natural Gas Industry Drilling Fluid Field Test Part 1 : Water-based drilling fluid.

[0061] 1. Base slurry configuration program

[0062] 1) Take 400ml of fresh water, add 8g of bentonite...

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PUM

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Abstract

The invention discloses an environmentally-friendly low-fluorescence imitation asphalt plugging agent which comprises the following components in percentage by weight: 10-20 percent of polyamide wax powder, 20-25 percent of oxidized polyethylene wax, 5-8 percent of poly-aluminum chloride, 20-25 percent of polyethylene glycol, 2-5 percent of sodium dodecyl benzene sulfonate, 10-15 percent of nanometer calcium carbonate and the balance of water. The plugging agent has low fluorescence, does not contain polycyclic aromatic hydrocarbons and other toxic substances, does not affect geological logging, has good environmental protection performance, has a certain hydration capacity and can prevent the hydration and the dispersion of shale particles when being adsorbed on a shale interface to playa collapse prevention role, and a part that is not soluble in water can fill pore throats and cracks to play a sealing role and can cover the shale interface to improve the quality of a mud cake, so that the high-temperature and high-pressure filtration loss of drilling fluid is reduced, and the plugging capability of the drilling fluid is improved.

Description

technical field [0001] The invention belongs to the field of petroleum drilling, and relates to an environment-friendly low-fluorescence imitation asphalt plugging agent. Background technique [0002] As the exploration field expands to new areas, the strata encountered become more and more complex, and the problem of wellbore instability becomes more and more serious. The shrinkage and collapse of mud shale, coal seam, piedmont structural belt, and salt-gypsum layer will cause instability of the well wall, affect the drilling speed, logging, and cementing quality, and even make it impossible to drill the target layer in some areas, affecting Realization of the purpose of exploration and development. Anti-slump agents mainly include inorganic salts, asphalt, humic acid and polymers, among which plugging anti-slump agents are mainly asphalt, polymer alcohols, aluminum compounds and silicates. Asphalt is currently recognized as an ideal anti-slump agent, but for drilling in ...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/24C09K8/46E21B33/13
CPCC09K8/03C09K8/24C09K8/46C09K2208/10C09K2208/12E21B33/13
Inventor 邢希金王荐冯桓榰舒福昌何松蒋卓向兴金袁青松
Owner CHINA NAT OFFSHORE OIL CORP
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