Weak-gel synthetic drilling fluid and preparation method thereof

A technology for synthesizing base and drilling fluid, applied in the field of drilling fluid, can solve the problems of low shear rate, low viscosity, difficulty in tripping, and poor ability to carry drill cuttings, etc., and achieves the effects of good thixotropy and high drilling speed.

Active Publication Date: 2012-11-14
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the drilling of highly deviated wells, extended reach wells and horizontal wells, when drilling with traditional water-based drilling fluids, a large amount of cuttings beds are formed near the well wall due to the poor suspension and cuttings-carrying ability of the drilling fluids. ; If water-based drilling fluid with strong cuttings-carrying ability is used for drilling, although the problem of sand-carrying is solved, compared with oil-based drilling fluid, there are problems such as large friction and difficulty in tripping; And synthetic base drilling fluid, although the inhibition and lubricity are good, but its low shear rate viscosity is small, and the ability to suspend and carry cuttings is relatively weak

Method used

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  • Weak-gel synthetic drilling fluid and preparation method thereof

Examples

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preparation example Construction

[0035] Drilling Fluid Preparation

[0036] The organoclay used in the examples is PF-MOGEL, provided by COSL; the main emulsifier is PF-MOEMUL-P, provided by COSL; the secondary emulsifier PF-MOCOAT is provided by COSL; the wetting agent is PF-MOWET, Provided by COSL; fluid loss control agent is PF-MOHFL, provided by COSL.

Embodiment 1

[0038] a. Formulation:

[0039] Gas oil: 70 parts;

[0040] Mass fraction is 30% calcium chloride aqueous solution: 30 parts; And

[0041] Based on the total parts by volume (100 parts) of gas-to-oil and aqueous calcium chloride solution, it is each component of the following mass volume ratios:

[0042] PF-MOGEL: 2.5%;

[0043] PF-MOEMUL-P: 1.0%;

[0044] PF-MOCOAT: 1.5%;

[0045] Calcium Oxide: 2.5%;

[0046] PF-MOWET: 0.8%;

[0047] PF-MOHFL: 2.5%;

[0048] Weighting Agent: Barite 32.5%.

[0049] b. Preparation process: Add the PF-MOGEL of the mass volume ratio to the gas-to-oil in the volume fraction and stir at a medium speed for 8 minutes, add PF-MOEMUL-P and PF-MOCOAT at the mass volume ratio and stir at a high speed for 2 minutes ; Add the calcium chloride aqueous solution whose mass fraction of the volume fraction is 30% under the condition of high-speed stirring, and stir at a high speed for 20 min; add the calcium oxide of the mass-volume ratio and stir for ...

Embodiment 2

[0051] a. Formulation:

[0052] Gas oil: 70 parts;

[0053] Mass fraction is 30% calcium chloride aqueous solution: 30 parts; And

[0054] Based on the total parts by volume (100 parts) of gas-to-oil and aqueous calcium chloride solution, it is each component of the following mass volume ratios:

[0055] PF-MOGEL: 2.5%;

[0056] PF-MOEMUL-P: 1.0%;

[0057] PF-MOCOAT: 1.5%;

[0058] Calcium Oxide: 2.5%;

[0059] PF-MOWET: 0.8%;

[0060] PF-MOHFL: 2.5%;

[0061] PF-MOVIS: 0.3% (a high molecular polymer with a nonlinear network structure formed by polycondensation reaction of adipic acid and triethylenetetramine under the protection of nitrogen, with a molecular weight of 87000, provided by Guangdong Kaiping United Technology Chemical Co., Ltd. );

[0062] Weighting Agent: Barite 32.5%.

[0063] b. Preparation process: Add the PF-MOGEL of the mass volume ratio to the gas-to-oil in the volume fraction and stir at a medium speed for 8 minutes, add PF-MOEMUL-P and PF-MOCOAT...

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Abstract

The invention discloses a weak-gel synthetic drilling fluid, which comprises 60-95 parts by volume of gas oil synthetic base liquid, 5-40 parts by volume of calcium chloride watery solution of which the mass fraction is 25-35%, as well as 1.0-3.5% of organic soil, 0.5-4.0% of primary emulsifier, 0.5-3.5% of auxiliary emulsifier, 0.5-3.5% of calcium oxide, 0.5-2.5% of wetting agent, 1.0-4.0% of filtrate reducer, 20-100% of weighting agent and 0.3-1.5% of optional activating agent according to a mass-volume ratio based on total volume fractions of the gas oil synthetic base liquid and the calcium chloride watery solution. The drilling fluid disclosed by the invention has the advantages as follows: (1) the synthetic drilling fluid has good thixotropy, and high low-shear rate viscosity, and (2) the plastic viscosity of the drilling liquid is smaller than that of the traditional drilling liquid.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a weak gel synthetic base drilling fluid and a preparation method thereof. Background technique [0002] For the drilling of highly deviated wells, extended reach wells and horizontal wells, when drilling with traditional water-based drilling fluids, a large amount of cuttings beds are formed near the well wall due to the poor suspension and cuttings-carrying ability of the drilling fluids ; If water-based drilling fluid with strong cuttings-carrying ability is used for drilling, although the problem of sand-carrying is solved, compared with oil-based drilling fluid, there are problems such as large friction and difficulty in tripping; And synthetic base drilling fluid, although the inhibition and lubricity are good, but its low shear rate viscosity is small, and the ability to suspend and carry cuttings is relatively weak. [0003] Therefore, it is necessary to provide a synthetic base drill...

Claims

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Application Information

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IPC IPC(8): C09K8/32
Inventor 罗健生李自立耿铁刘刚田荣剑关英伟雷克郁鲁彬张兴来
Owner CHINA NAT OFFSHORE OIL CORP
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