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Drilling fluid for drilling

A drilling fluid and flow pattern regulator technology, applied in the field of drilling fluid, can solve the problems of difficult adjustment of foam density, too many equipment, difficulty in matching plugging materials and leakage channels, etc., to achieve improved pressure bearing capacity, simple preparation of equipment, high density Adjust the effect of convenience

Active Publication Date: 2013-05-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a low-temperature microbubble for offshore oil drilling, aiming at the problems of the drilling fluid in the drilling process of the offshore lost zone, especially the difficulty in matching the plugging material with the lost channel, the large number of on-site production equipment, and the difficulty in adjusting the foam density. drilling fluid

Method used

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Embodiment 1

[0029] Embodiment 1, preparation of low-temperature micro-bubble drilling fluid for offshore oil drilling

[0030] The formula is: 400g of fresh water, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 1.60g of flow regulator (composed of xanthan gum and sodium tetraborate in a ratio of 1:1 by mass and part, wherein the number average of xanthan gum The molecular weight is 2×10 6 g / mol), foaming agent 1.20g (composed of dodecyl dimethyl amine oxide and sodium α-alkenyl sulfonate (number-average molecular weight: 300g / mol) with a mass-number ratio of 2:1), stable Agent 1.60g (composed of petroleum ether, sorbitol oleate and lauryl alcohol with a mass fraction ratio of 3:2:5), anti-slump inhibitor 1.20g (potassium polyacrylate, its number-average molecular weight is 5×10 6 g / mol), clay stabilizer glycidyltrimethylammonium chloride 8.00g, temperature stabilizer PC-J10S 4.00g and fungicide glutaraldehyde 0.40g. The mass ratio of each component is water: sodium carbonate: sod...

Embodiment 2

[0032] Embodiment 2, preparation of low-temperature micro-bubble drilling fluid for offshore oil drilling

[0033] The formula is: 400g of seawater from Bohai Sea, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 1.20g of flow regulator (composed of xanthan gum and boric acid with a mass-number ratio of 2:1, wherein the number-average molecular weight of xanthan gum 2×10 7 g / mol), foaming agent 0.80g (composed of dodecyl dimethyl amine oxide and sodium α-alkenyl sulfonate (number-average molecular weight: 320g / mol) with a mass-number ratio of 1:1), stable 0.40g of agent (composed of petroleum ether, sorbitol oleate and lauryl alcohol with a mass fraction ratio of 1:2:7), anti-slump inhibitor 1.60g (potassium polyacrylate, its number average molecular weight is 10×10 6 g / mol), clay stabilizer glycidyltrimethylammonium chloride (small cation) 10.00g, temperature stabilizer PC-J10S 8.00g and fungicide glutaraldehyde 0.80g. The mass ratio of each component is water: sodium ...

Embodiment 3

[0035] Embodiment 3, preparation of low-temperature micro-bubble drilling fluid for offshore oil drilling

[0036] The formula is: 400g of seawater from the East China Sea, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 1.20g of a flow regulator (composed of xanthan gum and sodium tetraborate in a ratio of 2:1 in parts by mass, wherein the number average of xanthan gum The molecular weight is 1.5×10 7 g / mol), foaming agent 0.80g (composed of dodecyl dimethyl amine oxide and sodium α-alkenyl sulfonate (number-average molecular weight: 310g / mol) with a mass-number ratio of 1:1), stable 0.80g of agent (composed of petroleum ether, sorbitol oleate and lauryl alcohol with a mass fraction ratio of 2:2:6), anti-slump inhibitor 1.60g (potassium polyacrylate, its number-average molecular weight is 7×10 6 g / mol), clay stabilizer glycidyltrimethylammonium chloride (small cation) 12.00g, temperature stabilizer PC-J10S 12.00g and fungicide glutaraldehyde 1.20g. The mass ratio of e...

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Abstract

The invention discloses a low temperature microbubble drilling fluid for offshore oil drilling. The drilling fluid comprises water, sodium carbonate, sodium hydroxide, a flow type modifier, a foaming agent and a stabilizing agent in a mass part ratio of 100: (0.1-0.3): (0.1-0.2): (0.3-0.4): (0.2-0.3): (0.1-0.4). A perforation fluid also comprises a collapse prevention inhibitor, a clay stabilizer, a temperature stabilizing agent and a bactericide. The low temperature microbubble drilling fluid for offshore oil drilling provided by the invention is the novel drilling fluid. In performance, thelow temperature microbubble drilling fluid for offshore oil drilling has the novel advantages of leakage controlling and leakage stopping and a characteristic of adjustable density besides the characteristics of the common bubble drilling fluid in the prior art.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a low-temperature microbubble drilling fluid for offshore oil drilling. Background technique [0002] Drilling fluid is one of the necessary materials used to balance formation pressure and ensure safe and smooth drilling during drilling. During the drilling process, lost circulation is a phenomenon that a large amount of working fluids such as drilling fluid, completion fluid, and workover fluid leak into the formation when the formation pressure is lower than the fluid column pressure. Lost circulation will cause downhole accidents or complex situations, resulting in prolonged construction time, increased operating costs, and even the scrapping of oil and gas wells, resulting in serious waste of resources and huge economic losses. In 2003, the cost of leak plugging alone in the world was about 800 million U.S. dollars, and did not include the funds invested in post-treatment accidents cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/08C09K8/12
Inventor 刘书杰郑力会田冀韩子轩李玉光曹园王珊耿站立
Owner CHINA NAT OFFSHORE OIL CORP
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