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High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and ultra-high density technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems affecting the safety of deeper oil and gas, high-efficiency development, subsidence stability damage, system rheological deterioration, etc. problems, to avoid the settlement of heavy materials, improve the stability of settlement, and stabilize the flow performance

Active Publication Date: 2021-03-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ultra-high-density oil-based drilling fluid weighted by ordinary barite has not fully met the needs of the site. Theoretical research believes that the weight limit of barite is 2.60g / cm 3 About, if it is 2.60g / cm 3 As the ultra-high-density drilling fluid continues to increase, it will face serious problems such as poor rheology of the system, damage to settlement stability, increased water loss in the system, and reduced anti-pollution ability, which will seriously affect the safe and efficient development of deeper oil and gas

Method used

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  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof
  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof
  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof

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preparation example Construction

[0062] figure 1 It is the flow chart of the preparation method of high temperature resistant ultra-high density oil-based drilling fluid of the present invention, as figure 1 Shown, preparation method of the present invention comprises the following steps:

[0063] S101: adding viscosifier, suspension enhancer, emulsifier, lime, calcium chloride aqueous solution, fluid loss reducer, and bridging agent to the base oil in sequence to obtain an intermediate system;

[0064] Wherein, when the emulsifier includes polyamide fatty acid and anionic emulsifier, the polyamide fatty acid is added first, and then the anionic emulsifier is added.

[0065] In addition, the amount of calcium chloride aqueous solution added can be determined according to the emulsification state of the mixture of base oil, viscosifier, suspension enhancer, emulsifier and lime, and try to ensure that the mixture after adding calcium chloride aqueous solution is in a homogeneous state.

[0066] S102: Add a we...

Embodiment 1

[0076] The base fluid of the high-temperature-resistant ultra-high-density oil-based drilling fluid of this embodiment includes the following components according to mass percentage:

[0077] Base oil (0# diesel): 27.9%

[0078] Viscosifier (high temperature and high pressure wet processing organic bentonite): 0.07%

[0079]Suspension enhancer (hydroxyapatite): 0.07%

[0080] Anti-high temperature main emulsifier (polyamide fatty acid): 6.66%

[0081] Anti-high temperature co-emulsifier (anionic emulsifier): 0.60%

[0082] Lime: 50.4%

[0083] Fluid loss control agent (polyvinyltoluene / acrylate copolymer): 6.85%

[0084] Bridging agent (calcium carbonate mixture of different particle sizes): 6.85%

[0085] Wetting agent (sulfonate surfactant): 0.60%

[0086] Weighting agents include:

[0087] A calcium chloride aqueous solution with a mass concentration of 25% and a weighting agent, wherein the weighting agent includes barite, micromanganese ore powder and micro ilmenit...

Embodiment 2

[0097] The composition of the high-temperature-resistant ultra-high-density base liquid of the present embodiment is the same as that of Example 1, and the weight control agent (calcium chloride aqueous solution and mass ratio is barite, micromanganese ore powder and micro-ilmenite powder of 3:1:1 Weighting agent) addition is different from embodiment 1.

[0098] The preparation method of the high-temperature-resistant ultra-high-density oil-based drilling fluid of the present embodiment comprises the following steps:

[0099] 1) Preparation of intermediate system

[0100] After adding tackifier to base oil, stir for 5 minutes, add suspension enhancer and stir for 5 minutes, add polyamide fatty acid and stir for 5 minutes, add anionic emulsifier and stir for 5 minutes, add lime and stir for 5 minutes, add calcium chloride aqueous solution Stir for 15 minutes, add the fluid loss control agent and stir for 5 minutes, then add the bridging agent and stir for 5 minutes to obtain ...

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Abstract

The invention provides a high-temperature-resistant ultrahigh-density oil-based drilling fluid and a preparation method thereof. The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises a base fluid and a weight adjusting agent. The base fluid comprises the following components in percentage by mass: 15-35% of base oil, 0.05-1.50% of a tackifier, 0.05-1.50% of a suspension enhancer, 1.05-13% of an emulsifier, 20-75% of lime, 1-10% of a filtrate reducer, 1-10% of a bridge plugging agent and 0.05-3% of a wetting agent. The weight adjusting agent comprises a calcium chloride aqueous solution and a weighting agent. The weighting agent comprises barite, micro-manganese ore powder and micro-ilmenite powder. The oil-based drilling fluid has the characteristics of high temperature resistance, high density, strong stability and excellent rheological property, and can meet the development requirements of ultrahigh-pressure and ultrahigh-temperature stratums.

Description

technical field [0001] The invention relates to a high-temperature-resistant ultra-high-density oil-based drilling fluid and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] Global energy demand pushes the petroleum industry to develop oil and gas resources for extremely harsh ultra-high pressure and ultra-high temperature formations. However, ultra-high pressure and ultra-high temperature formations are complex, which will lead to problems such as increased construction difficulty. Based on the existing problems in drilling construction, it is very necessary to study the drilling fluid system suitable for this type of formation to ensure the smooth progress of drilling. [0003] At present, the commonly used drilling fluid system at home and abroad includes oil-based drilling fluid system and water-based drilling fluid system. It has strong anti-pollution ability and good lubricity. At the same time, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 滕学清任玲玲朱金智李庆辉李少轩李家学罗威陆海瑛吴晓花张绍俊
Owner PETROCHINA CO LTD
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