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Low-density water-based drilling fluid and preparation method thereof

A water-based drilling fluid and low-density technology, which is applied in the field of oil field drilling fluid, can solve the problems of large leakage and pipe sticking risk, and easy pressure leakage in the upper formation, so as to shorten the well construction period, ensure safe drilling, and broad application prospects Effect

Inactive Publication Date: 2019-06-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For long open-hole sections, high-density drilling is easy to leak off the upper formation, and there is a greater risk of lost circulation and pipe sticking

Method used

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  • Low-density water-based drilling fluid and preparation method thereof
  • Low-density water-based drilling fluid and preparation method thereof
  • Low-density water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment relates to a low-density drilling fluid suitable for safe drilling in long open-hole diabase well sections. The components are calculated in parts by weight, including 100 parts of water, 3.5 parts of sodium bentonite, and 0.125 parts of Na 2 CO 3 , 2.5 parts of LV-PAC, 2.0 parts of SMC, 3.0 parts of SPNH, 0.8 parts of glass beads, 2.5 parts of emulsified pitch FF-III, 2.5 parts of ultrafine calcium carbonate, 0.1 parts of NaOH, 3.0 parts of NaCl, 38 parts of barite. Ultrafine calcium carbonate particle size 20 ~ 60μm. All components are commercially available products.

[0029] The concrete preparation method of this embodiment is: at first 0.125 parts of Na 2 CO 3 Dissolve in 100 parts of water, add 3.5 parts of sodium bentonite, after hydration, add 2.5 parts of LV-PAC, 2.0 parts of SMC, 3.0 parts of SPNH, 0.8 parts of glass microspheres, 2.5 parts of emulsified asphalt FF-III, 2.5 parts of superfine Calcium carbonate, 0.1 part of NaOH and 3.0 par...

Embodiment 2

[0034] This embodiment relates to a low-density drilling fluid suitable for safe drilling in long open-hole diabase formations. The components include 100 parts by weight of water, 3.0 parts of calcium-based sodium bentonite, and 0.175 parts of Na 2 CO 3 , 2.0 parts of LV-CMC, 1.5 parts of SMC, 2.0 parts of SPNH, 0.5 parts of graphite, 2.0 parts of paraffin nanoemulsion, 1.5 parts of ultrafine calcium carbonate, 0.08 parts of NaOH, 7.5 parts of KCl, 46 parts of barite. Ultrafine calcium carbonate particle size 40 ~ 60μm. All components are commercially available products.

[0035] The concrete preparation method of this embodiment is: at first 0.175 parts of Na 2 CO 3Dissolve in 100 parts of water, add 3.0 parts of calcium-based sodium bentonite, after hydration, add 2.0 parts of LV-CMC, 1.5 parts of SMC, 2.0 parts of SPNH, 0.5 parts of graphite, 2.0 parts of paraffin nanoemulsion, 1.5 parts of ultrafine carbonic acid Calcium, 0.08 parts of NaOH and 7.5 parts of KCl are ad...

Embodiment 3

[0040] This embodiment relates to a low-density drilling fluid suitable for safe drilling in diabase formations. The components include 100 parts of water, 3.0 parts of sodium bentonite, and 0.125 parts of Na 2 CO 3 , 1.5 parts of LV-CMC, 1.5 parts of SMC, 1.5 parts of SMP-II, 1.5 parts of SPNH, 0.5 parts of vegetable oil-based lubricant SMJH-1, 2.5 parts of emulsified asphalt FF-III, 2.5 parts of asbestos fiber, 0.06 parts of KOH, 80 parts Micromanganese ore powder. The length of asbestos fiber is 20-60 μm, and the diameter is 15-30 μm. All components are commercially available products.

[0041] The concrete preparation method of this embodiment is: at first 0.125 parts of Na 2 CO 3 Dissolve in 100 parts of water, add 3.0 parts of sodium bentonite, after hydration, add 1.5 parts of LV-CMC, 1.5 parts of SMC, 1.5 parts of SMP-II, 1.5 parts of SPNH, 0.5 parts of vegetable oil-based lubricant SMJH-1, 2.5 parts Add emulsified asphalt FF-III, 2.5 parts of asbestos fiber, and ...

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Abstract

The invention provides a low-density water-based drilling fluid system for safely drilling through a long open-hole diabase formation. The drilling fluid system comprises the following components, inparts by weight: 100 parts by weight of water, 0.5-5.0 parts by weight of slurry mixing soil, 0.003-0.25 part by weight of sodium carbonate, 0.2-8.0 parts by weight of a fluid loss agent, 1.0-10.0 parts by weight of a sulfonated material, 0.1-2.0 parts by weight of a lubricant, 1.0-6.0 parts by weight of an anti-collapse agent, 1.0-6.0 parts by weight of a plugging agent while drilling, 0.01-0.4 part by weight of a pH adjusting agent and 40-80 parts by weight of a weighting agent; and the drilling fluid system further comprises 0.1-10.0 parts by weight of an inorganic salt. The drilling fluidprovided by the invention has good rheological performance and rock-carrying capacity; the drilling fluid can not only safely drill through the diabase formation, but also can meet the purpose that fallen diabase returns to the ground in time, effectively avoid stuck drilling, ensure safe drilling and shorten a well construction period through improvement of plugging while drilling and collapse resistance of the system.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluid, in particular to a low-density water-based drilling fluid system suitable for drilling in long open-hole diabase formations and a preparation method thereof. Background technique [0002] With the continuous expansion of the field of oil exploration, deep wells and ultra-deep wells will be the focus of drilling in the future, and the formation conditions encountered are becoming more and more complex. Among them, diabase is one of the types of intrusions often encountered in deep complex well sections, and has the characteristics of deep burial, high density, high hardness and high formation temperature. Water-based drilling fluid is currently the most widely used drilling fluid system due to its good cost performance. When drilling diabase formations in long open hole sections, in order to balance the collapse pressure of diabase formations, water-based drilling fluids with a de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20C09K8/24C09K8/504C09K8/508
Inventor 金军斌董晓强徐江张国高伟李雄唐文泉
Owner CHINA PETROLEUM & CHEM CORP
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