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New high temperature resistant low viscosity high shear water-in-oil drilling fluid

A technology of high temperature resistance and drilling fluid, applied in the field of drilling fluid, can solve the problems of inability to ensure the safety of deep wells, rapid drilling, debris can not be removed in time, poor wellbore stability, etc., to enhance thermal stability and electrical stability, The effect of shortening drilling cycle and preventing wellbore collapse

Active Publication Date: 2016-12-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current conventional high-temperature water-in-oil drilling fluids generally have problems such as high viscosity, low shear force, poor cuttings-carrying ability, and low ROP in field operations.
This type of drilling fluid cannot guarantee the safe and rapid drilling of deep wells, and many complex problems are prone to occur during construction, such as the debris broken by the drill bit at the bottom of the well cannot be removed in time, and cuttings are repeatedly cut; the stability of the well wall is poor, and the well diameter is not good Downhole complex problems caused by rules; long time to deal with complex downhole accidents, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 360 mL of diesel oil, 40 mL of calcium chloride brine with a mass fraction of 20%, 24 g of DQGC, 8 g of DQNS, 12 g of BS-1C, 6 g of lime, and 16 g of DQHA; add diesel oil, main, auxiliary emulsifier, and organic bentonite into the high stirring cup in turn. , lime, fluid loss reducer and calcium chloride brine, each adding a treatment agent is stirred at a speed of 12000r / min, so that the treatment agent is fully dispersed in the system, and stirred for a total of 90min to prepare the drilling fluid of the present invention.

Embodiment 2

[0014] Weigh 360 mL of diesel oil, 40 mL of calcium chloride brine with a mass fraction of 20%, 26 g of DQGC, 9.2 g of DQNS, 16 g of BS-1C, 12 g of lime, and 24 g of DQHA; add diesel oil, main, auxiliary emulsifier, organic Bentonite, lime, fluid loss control agent and calcium chloride brine are stirred at a speed of 12000 r / min each time a treatment agent is added, so that the treatment agent is fully dispersed in the system, and stirred for a total of 90 minutes to prepare the drilling fluid of the present invention.

Embodiment 3

[0016] Weigh 360 mL of oil, 40 mL of calcium chloride brine with a mass fraction of 20%, 28 g DQGC, 14 g DQNS, 16 g BS-1C, 12 g lime, and 24 g DQHA; add diesel oil, main, auxiliary emulsifier, and organic bentonite into the high stirring cup in turn. , lime, fluid loss reducer and calcium chloride brine, each adding a treatment agent is stirred at a speed of 12000r / min, so that the treatment agent is fully dispersed in the system, and stirred for a total of 90min to prepare the drilling fluid of the present invention.

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Abstract

The invention relates to a novel high-temperature-resistant low-viscosity high-shear water-in-oil drilling fluid which comprises the following components in parts by weight: 68-72 parts by weight of fluid oil, 10-11 parts by weight of a brine phase, 5.8-6.4 parts by weight of a primary emulsifier, 1.9-3.2 parts by weight of an auxiliary emulsifier, 3.0-3.7 parts by weight of organic bentonite, 2.8-2.9 parts by weight of lime and 3.9-5.6 parts by weight of a filtrate reducer. The novel high-temperature-resistant low-viscosity high-shear water-in-oil drilling fluid can be resistant to the temperature of 200 DEG C and has the characteristics of low viscosity, high shear force, high suspending power and good filtration well building property.

Description

technical field [0001] The invention relates to a drilling fluid used in the field of oil drilling, in particular to a novel water-in-oil drilling fluid with high temperature resistance, low viscosity and high shear. Background technique [0002] Water-in-oil drilling fluid is an inverse emulsification drilling fluid with oil as the continuous phase and water as the dispersed phase. It is especially suitable for water-sensitive formations, such as some shale formations that are easy to collapse in contact with water; or for better protection and The development of oil and gas layers requires drilling engineering that is implemented by means of underbalanced drilling; or drilling engineering that needs to effectively reduce the friction between the drilling fluid and the drilling tool during the construction of horizontal wells, and improve the lubricating ability of the drilling fluid. [0003] However, the current conventional high-temperature water-in-oil drilling fluids g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36
Inventor 闫晶杨智光徐永辉刘永贵张坤刘振华宋涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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