Clay-free low-density oil-based drilling fluid

An oil-based drilling fluid and clay-free technology, applied in the field of drilling fluid, can solve the problems of insecure wellbore, reservoir Jamin effect, reservoir damage, etc., and achieve reduction of reservoir damage, low fluorescence level, and fluid loss low effect

Active Publication Date: 2011-07-27
CHINA PETROCHEMICAL CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to many shortcomings of aerated drilling fluid or foam drilling fluid, and its compressibility, the pulse signal attenuation is serious, and the use of MWD is limited when drilling horizontal wells and extended-reach wells.
In addition to the above disadvantages, foam drilling fluid cannot be used in areas with strong water sensitivity
In the drilling process of low-pressure and low-permeability reservoirs, if the conventional oil-based drilling fluid is used, the emulsified water droplets contained in it will often cause serious Jamin effect in the reservoir; in order to maintain the stability of the water-in-oil emulsion, a A large number of emulsifiers will cause the rock surface to change from hydrophilic to oil-fr...

Method used

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Embodiment Construction

[0024] The properties of the drilling fluid prepared according to the above steps are as follows:

[0025] 1. Take laboratory drilling fluid as an example:

[0026] a. When the drilling fluid contains 400mL 5# white oil, 2.5% oil product thickener, 0.5% viscosifier, 0.5% sodium dodecylbenzene sulfonate, 1.0% oil dispersible granular calcium carbonate (by mass ratio , 500 mesh: 800 mesh: 1000 mesh=3:2:5), 0.5% calcium oxide, 2.0% oil-soluble anti-high temperature fluid loss reducer, the apparent viscosity of the system is 24-28mPa.s, and the dynamic shear force is 18-22Pa, initial and final cut is 1.0-2.0 / 3.0-5.0, API water loss is less than 1.5mL, electrical stability ES is higher than 2000V, density is 0.85g / cm 3 , the drilling fluid stability time exceeds 24h;

[0027] b. When the drilling fluid contains 400mL 5# white oil, 3.0% oil product thickener, 0.8% viscosifier, 0.3% sodium dodecylbenzene sulfonate, 2.0% oil dispersible granular calcium carbonate (by mass ratio , 8...

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Abstract

The invention relates to drilling liquid for use in the drilling process of oil exploration wells and production wells and belongs to low-density oil-based drilling fluid. The drilling fluid overcomes the drawbacks of serious pollution and strong Jamin effects of the conventional oil-based drilling fluid in hypotonic and water sensitive reservoir strata. The drilling fluid is characterized by containing low-density base oil, oil thickener, oil swelling agent, oil dispersible particle calcium carbonate, calcium oxide and oil soluble high-temperature-resistance fluid loss additive. The drilling fluid does not contain any water phase, the breaking voltage of the drilling fluid is high, the viscosity of the drilling fluid is proper, and the filtration is small (all filtrate is oil). The drilling fluid has the characteristics of high electrical stability, high temperature resistance, high water, soil and salt pollution resistance, excellent emulsification effect at high temperature and the like. The stabilization time of the drilling fluid can reach 20 to 40 hours.

Description

technical field [0001] The invention designs a drilling fluid used in the drilling process of petroleum exploration wells and production wells, which belongs to the low-density oil-based drilling fluid system. technical background [0002] At present, in the process of oilfield exploration and development, many large oilfields at home and abroad have entered the later stage of development, and some low-pressure and low-permeability reservoirs have been put into development one after another. Exploration and development of these reservoirs are difficult and require high drilling fluid density. During the drilling process, drilling fluid is essential. It can carry and suspend cuttings, stabilize the well wall and balance the formation pressure, cool and lubricate the drill bit and drilling tools, and transmit hydrodynamic force. The performance of the drilling fluid directly affects the quality of the well and the drilling speed. In the process of drilling in low-pressure, l...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor 蓝强李公让薛玉志张敬辉李海斌张虹
Owner CHINA PETROCHEMICAL CORP
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