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Complete-oil synthetic base drilling fluid

A technology for synthesizing bases and drilling fluids, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting mechanical rotation speed and wellbore purification, emulsification failure, thermodynamic instability, etc., and achieve good water loss for wall building. High performance, strong anti-pollution ability, good reservoir protection effect

Inactive Publication Date: 2008-07-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Poor shear thinning
The water-in-oil emulsified drilling fluid has high plastic viscosity and low dynamic shear force, resulting in low viscosity at low shear rate, which affects the mechanical speed and wellbore purification to a certain extent
[0004] (2) It is difficult for the activity of water in the system to maintain an activity balance with the various formations encountered
Since it is difficult to balance the activity of different formations by adjusting the activity of the water phase in the water-in-oil emulsified drilling fluid at any time, it cannot be ensured that various easily collapsible formations (especially formations with high montmorillonite content) will not cause hydration. destabilize the wellbore
[0005] (3) There are potential damage factors such as wettability reversal and emulsification blockage
[0006] (4) The water-in-oil drilling fluid system is a thermodynamically unstable system, and there is a danger of emulsification failure. A large amount of emulsifier is required, which virtually increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The configuration density is 0.8g / cm 3 All-oil synthetic-based drilling fluid: Take 300ml of vaporized oil with a measuring cylinder and pour it into a tall stirring cup, add 8.7g of polybutadiene rubber tackifier in sequence, and stir for 5 minutes under the condition of 10000r / min to dissolve it. Add 15g of organic soil, stir for 5 minutes under the condition of 10000r / min, then add 6g of vegetable oleic acid amide emulsifier and 1.5g of 1227 wetting agent to the high stirring cup successively, stir for 20 minutes under the condition of 10000r / min, add 3g For the modified humic acid fluid loss reducer, stir for 5 minutes under the condition of 10000r / min, add 1.5g of CaO, and stir for 5 minutes under the condition of 10000r / min.

Embodiment 2

[0056] The configuration density is 1.0g / cm 3The whole oil synthetic base drilling fluid: Take 300ml of vaporized oil with a measuring cylinder and pour it into a high stirring cup, add 7.5g of polybutadiene rubber tackifier in turn, stir for 5 minutes under the condition of 10000r / min to dissolve it, Add 15g of organic soil and stir for 5 minutes under the condition of 10000r / min, then add 4.5g of vegetable oleic acid amide emulsifier and 1.5g of 1227 wetting agent to the high stirring cup successively, stir for 20 minutes under the condition of 10000r / min, add 3g of modified humic acid fluid loss reducer, stirred for 5 minutes under the condition of 10000r / min, added 1.5g of CaO, stirred for 5 minutes under the condition of 10000r / min, finally added 80g of barite, under the condition of 10000r / min Stir for 20 minutes.

Embodiment 3

[0058] The configuration density is 1.2g / cm 3 The whole oil synthetic base drilling fluid: Take 300ml of vaporized oil with a measuring cylinder and pour it into a high stirring cup, add 7.5g of polybutadiene rubber tackifier in turn, stir for 5 minutes under the condition of 10000r / min to dissolve it, Add 15g of organic soil, stir for 5 minutes under the condition of 10000r / min, then add 6g of vegetable oleic acid amide emulsifier, 3g of 1227, and 3g of styrene-butadiene latex to the high stirring cup successively, stir for 20 minutes under the condition of 10000r / min, add 3g of modified humic acid wetting agent, stirred at 10000r / min for 5 minutes, added 1.5g of CaO, stirred at 10000r / min for 5 minutes, finally added 180g of barite, stirred at 10000r / min 20 minutes.

[0059] 1. Evaluation of the drilling fluid performance of each embodiment

[0060] The all-oil synthetic base drilling fluids of the three examples were hot-rolled at 150°C for 16 hours, and then the rheology...

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Abstract

The invention discloses whole-oil synthetic base drilling fluid which mainly comprises following components: base liquid 100 parts, histosol 2-5 parts, viscosity increaser 0.5-3 parts, filtrate reducer 2-5 parts, wetting agent 0.5-2 parts, emulsifier 1-3 parts, calcium oxide 0.5 part and weighting agent 27-180 parts. The invention has the advantages that firstly, the rheological property is good and the plastic viscosity is low, secondly, the anti-temperature performance is good and anti-temperature can reach 150 DEG C, thirdly, the invention is provided with good water loss wall building performance with API filter loss content<5ml and high temperature and high pressure filter loss content <= 10 ml, fourthly, the anti-pollution ability is strong and the anti-poor soil ability and the anti-water invasion ability respectively reach 20%, and fifthly, reservoir has good protective effects and the permeability recovery value is over 85%.

Description

technical field [0001] The invention relates to an operating fluid in drilling engineering, in particular to an all-oil synthetic base drilling fluid. Background technique [0002] Water-in-oil emulsified drilling fluid (water phase ≥ 10%) has been widely used at present, but there are still some shortcomings in the following aspects: [0003] (1) Poor shear thinning. The water-in-oil emulsified drilling fluid has high plastic viscosity and low dynamic shear force, resulting in low viscosity at low shear rate, which affects the mechanical speed and wellbore cleaning to a certain extent. [0004] (2) The activity of water in the system is difficult to maintain an activity balance with the various formations encountered. Since it is difficult to balance the activity of different formations by adjusting the activity of the water phase in the water-in-oil emulsified drilling fluid at any time, it cannot be ensured that various easily collapsible formations (especially formatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/34
Inventor 徐绍诚舒福昌罗健生史茂勇向兴金蒋卓石磊崔应中
Owner CHINA NAT OFFSHORE OIL CORP
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