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Soil-phase-free oil-based drilling fluid

An oil-based drilling fluid, soil-free technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of easy sticking downhole, poor tripping, easy to induce lost circulation, etc. Loss of lost circulation, easy on-site operation and maintenance, good economic and social benefits

Active Publication Date: 2014-05-14
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] The purpose of the present invention is to overcome the problems in the prior art that the earth phase oil-based drilling fluid has poor rheological properties under high-density conditions, poor tripping, easy sticking, complex downhole accidents and lost circulation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 1) Preparation of compound emulsifier G326-HEM: Weigh 60% rosin, 20% cyclohexane and 20% 3# white oil according to the weight percentage, and take ethanol whose weight is 2~3 times the weight of rosin acid; in the reaction kettle Add ethanol and abietic acid in sequence in proportion, stir fully until the abietic acid is completely dissolved in ethanol and heat; when the temperature of the reaction kettle reaches 60°C~80°C, add cyclohexylamine dropwise at a uniform speed within 0.5h~1h, Stir at r / min~120 r / min and keep warm for 4h~8h; continue to heat to 90°C~100°C to distill ethanol, add 3# white oil, stir for 0.5h, and get this soil-free oil-based drilling fluid Use emulsifier G326-HEM.

[0011] 2) Preparation of fluid loss reducer G328: Weigh 100g of humic acid and place it in a 250 mL three-neck flask, weigh 50g of octadecylamine into a 200mL beaker, dissolve it with 50mL of absolute ethanol, then pour it into a three-necked flask, and heat to reflux 40 min; dist...

Embodiment 2

[0019] According to the preparation method of Example 1, under the same oil-water ratio (80 / 20), white oil and diesel oil were used as the base oil of the system respectively, and the properties of soil-free oil-based drilling fluids prepared with three different base oils were tested. , the test results are shown in Table 2.

[0020] Table 2 Properties of soil-free oil-based drilling fluids formulated with different base oils

[0021]

Embodiment 3

[0023] 1) Referring to Example 1, compound emulsifier G326-HEM and fluid loss control agent G328 were prepared.

[0024] 2) Preparation of soil-free oil-based drilling fluid: prepare 50 cubic meters (O / W: 90 / 10) of soil-free oil-based drilling fluid, clean and prepare two mixing tanks. Use a pump to pump Saraline 185V, which is used for 45 m3 gas oil production, into No. 1 tank, and add 1500kg of compound emulsifier G326-HEM, 1500kg of fluid loss reducer G328, and 1000kg of lime according to the pre-calculated amount. After the lime is added, fully stir for 3-4 hours until all oil-soluble components are completely dissolved.

[0025] Pump 5 cubic meters of clean water into No. 2 tank, add 2000kg of CaCl 2 . Under the strong stirring of special equipment such as drilling fluid gun, the CaCl 2 The brine was slowly added to the oil phase. It is best to stir the drilling fluid through the 1.27cm drilling fluid gun nozzle under the pump pressure above 3.45MPa. If the pump pres...

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Abstract

The invention relates to a soil-phase-free oil-based drilling fluid. The soil-phase-free oil-based drilling fluid is prepared from the following raw materials in percentage by weight: 50-85 percent of base oil, 5-30 percent of CaCl2 saline, 1-4 percent of composite type emulsifier G326-HEM, 1-5 percent of filtrate reducer G328, 0.5-3 percent of alkalinity conditioning agent, 0.5-3 percent of tackifier, 0.2-2 percent of viscosifier and the balance of barite. According to the soil-phase-free oil-based drilling fluid, the demulsification voltage is higher than 800V, and the temperature resistance of higher than 180 DEG C is achieved; the formula is simple, the field operation and maintenance are convenient, and the soil-phase-free oil-based drilling fluid has good rheological property in the absence of a wetting agent under the condition of high density; the system is widely applicable to the base oil and can be used in mineral oil or gaseous oil; and a novel method is provided for lowering the well leakage loss of the oil-based drilling fluid, the cost of the drilling fluid is also remarkably lowered, good economic and social benefits are obtained, and thus the soil-phase-free oil-based drilling fluid is worthy of popularization and application.

Description

technical field [0001] The invention relates to a soil-free oil-based drilling fluid, in particular to a high-density soil-free oil-based drilling fluid. Background technique [0002] With the large-scale development of unconventional gas reservoirs marked by shale gas at home and abroad, the application of oil-based drilling fluids is becoming more and more extensive. At present, the oil-based drilling fluids used in the development of shale gas and unconventional gas reservoirs are soil-based oil-based drilling fluids. In the first commercially exploited shale gas block in my country, soil-based oil-based drilling fluids are used. base drilling fluid. Oil-based drilling fluid with soil phase uses organic soil as viscosifier and suspended barite. There are soil phase systems exposed to poor rheology under high-density conditions, poor tripping, easy to stick and cause complex accidents downhole, low solid content, high equivalent circulation density, easy to induce lost ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 王京光杨斌张小平赵海峰吴满祥王勇强曹辉吴超
Owner BC P INC CHINA NAT PETROLEUM CORP
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