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

A water-based drilling fluid and high-density technology, applied in the field of oilfield drilling fluids, can solve the problems of unknown rock-carrying effect of high-density drill cuttings, achieve good settlement stability, improve drilling efficiency, and avoid the effects of sticking.

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

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Problems solved by technology

Patent CN103361038 discloses a high-temperature and high-density freshwater drilling fluid, which emphasizes high-temperature resistance and anti-pollution capabilities, and whether its rheological properties meet the rock-carrying effect of high-density cuttings is unknown
However, the starting point of research and development in the above literature is not for the characteristics of diabase formations, so further improvements are needed in rheological properties such as viscosity, shear force, and dynamic-plastic ratio that are emphasized in drilling in diabase formations

Method used

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

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Embodiment 1

[0040] This embodiment relates to a high-density drilling fluid suitable for safe drilling in diabase formations. The components include 100 parts of water, 2.5 parts of calcium-based bentonite, and 0.125 parts of Na 2 CO 3, 1.5 parts of LV-PAC, 1.0 parts of SMC, 1.0 parts of SMP-2, 1.0 parts of SPNH, 0.5 parts of graphite, 2.5 parts of emulsified pitch FF-III, 1.5 parts of superfine calcium carbonate, 0.2 parts of NaOH, 2.0 parts of NaCl, 103 parts Barite. The ultrafine calcium carbonate particle size is 20-50 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 2.5 parts of calcium-based bentonite, after hydration, add 1.5 parts of LV-PAC, 1.0 parts of SMC, 1.0 parts of SMP-2, 1.0 parts of SPNH, 0.5 parts of graphite, 2.5 parts of emulsified asphalt FF-III , 1.5 parts of superfine calcium carbonate, 0.2 parts of NaOH and 2.0 parts of N...

Embodiment 2

[0046] This embodiment relates to a high-density drilling fluid suitable for safe drilling in diabase formations. The components include 100 parts of water, 2.5 parts of calcium-based sodium bentonite, and 0.125 parts of Na 2 CO 3 , 2.0 parts of LV-CMC, 1.5 parts of SMC, 1.0 parts of SMP-2, 2.0 parts of SPNH, 0.5 parts of graphite, 2.0 parts of emulsified pitch FF-III, 1.5 parts of butyl rubber, 0.2 parts of NaOH, 2.0 parts of NaCl, 115 parts by weight spar. The particle size of butyl rubber is 40-80 μm. All components are commercially available products.

[0047] 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 2.5 parts of calcium-based sodium bentonite, after hydration, add 2.0 parts of LV-CMC, 1.5 parts of SMC, 1.0 parts of SMP-2, 2.0 parts of SPNH, 0.5 parts of graphite, 2.0 parts of emulsified asphalt FF -III. Add 1.5 parts of butyl rubber, 0.2 parts of NaOH and 2.0 parts of NaCl into the so...

Embodiment 3

[0052] This embodiment relates to a high-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 , 0.6 parts of HV-PAC, 1.5 parts of SMC, 1.5 parts of SMP-2, 1.5 parts of SPNH, 1.2 parts of graphite, 2.5 parts of emulsified pitch FF-III, 1.5 parts of asbestos fiber, 0.2 parts of NaOH, 3.0 parts of KCl, 135 parts of recrystallization stone. The length of asbestos fiber particles is 20-60 μm, and the diameter is 15-30 μm. All components are commercially available products.

[0053] 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 0.6 parts of HV-PAC, 1.5 parts of SMC, 1.5 parts of SMP-2, 1.5 parts of SPNH, 1.2 parts of graphite, 2.5 parts of emulsified pitch FF-III, Add 1.5 parts of asbestos fiber, 0.2 parts of NaOH and 3.0 parts ...

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Abstract

The invention relates to the technical field of drilling fluids, and provides a high-density water-based drilling fluid system for safely drilling through a diabase formation. The drilling fluid comprises the following components, in parts by weight: 100 parts by weight of water, 0.5-6.0 parts by weight of slurry mixing soil, 0.025-0.3 part by weight of sodium carbonate, 0.2-8.0 parts by weight ofa fluid loss reducing 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 ablocking agent, 0.1-0.8 part by weight of a pH adjusting agent, 1.0-10.0 parts by weight of an inorganic salt and 100-160 parts by weight of a weighting agent. The high-density drilling fluid systemprovided by the invention can not only ensure that the diabase formation is safely drilled, but also can carry diabase fallen blocks caused by release of ground stress in the initial stage of drillingthrough the diabase formation out of the ground in time, effectively avoid an occurrence of complex situations such as stuck drilling, and improve drilling efficiency on the basis of ensuring safe drilling.

Description

technical field [0001] The invention relates to the technical field of oil field drilling fluid, in particular to a high-density water-based drilling fluid system suitable for drilling in 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 a formation frequently encountered in deep and complex well sections, and has the characteristics of deep burial, high density, high hardness and high formation temperature. The basic function of drilling fluid is to carry cuttings back from the bottom of the well, stabilize the well wall, balance formation pressure, transmit hydrodynamic force, cool and lubricate the drill bit. Compared with oil-based drilling fluid, water-based drilling fluid is currently the most widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/16
Inventor 董晓强金军斌高伟张国徐江唐文泉李雄
Owner CHINA PETROLEUM & CHEM CORP
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