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Oil-based shaft stabilizing fluid for gas-liquid conversion and preparation method thereof

A gas-liquid conversion, oil-based well technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of formation mudstone hydration expansion, complicated operation process, time-consuming and laborious, etc., to improve the pressure bearing capacity, Simple preparation process and wide application range

Inactive Publication Date: 2013-01-02
浙江仁智股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above process, there are mainly the following problems: (1) Whether it is a water-based wetting reversal agent or a strong suppression and strong plugging drilling fluid, water is used as a dispersant, which will inevitably penetrate into the formation, causing Formation mudstone hydration expansion and dispersion
(2) The operation process of the two-step method is cumbersome, time-consuming and labor-intensive, and it is often remedied after a problem occurs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, we use the following components in mass ratio: diesel oil: 50 parts; organic fat: 3 parts; oleic acid: 5 parts; paraffin wax: 5 parts; calcium carbonate: 3 parts.

[0032] The above components are prepared by the following method: uniformly dissolve the organic fat in the required amount of diesel oil at 20°C-60°C, stir thoroughly for 1-2 hours, then add the required amount of oleic acid, and stir thoroughly for 1-2 hours After 2 hours, add the required amount of paraffin and calcium carbonate, and fully stir for 2-3 hours to form a fluid with stable performance, that is, to obtain an oil-based wellbore stable fluid for gas-liquid conversion.

[0033] For the above-mentioned oil-based wellbore stabilization fluid for gas-liquid conversion, we tested its rolling recovery rate, linear expansion rate and bearing strength. : Soak at 120℃, 3MPa for 8h. The test results are: rolling recovery rate (%): 92.5, linear expansion rate (%): 8.5, bearing strength...

Embodiment 2

[0035] In the present embodiment, we adopt each component of following mass ratio: white oil: 55 parts; Organic soil: 3 parts; OP-10: 7 parts; Asphalt: 10 parts; Rubber particle: 5 parts, all the other are the same as embodiment 1 .

[0036] The test results are: rolling recovery rate (%): 92.7, linear expansion rate (%): 8.4, bearing strength (MPa): 2.9.

Embodiment 3

[0038] In this embodiment, we use the following components in mass ratio: aviation kerosene: 58 parts; organic soil: 5 parts; OP-30: 8 parts; modified asphalt: 8 parts; plant fiber: 10 parts, and the rest are implemented in the same way example 1.

[0039] The test results are: rolling recovery rate (%): 92.9, linear expansion rate (%): 8.5, bearing strength (MPa): 3.1.

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Abstract

The invention discloses oil-based shaft stabilizing fluid for gas-liquid conversion and a preparation method thereof and relates to working solution for gas-liquid conversion in the petroleum and gas drilling process. The preparation method comprises the following steps of: uniformly dissolving 3 to 5 parts of tackifier into 50 to 75 parts of mineral oil at a temperature of 20 DEG C to 60 DEG C and sufficiently stirring for 1 to 2 hours; then adding 5 to 20 parts of surfactant and sufficiently stirring for 1 to 2 hours; and adding 5 to 20 parts of formation sealant and 3 to 20 parts of temporary plugging additive and sufficiently stirring for 2 to 3 hours to form fluid with stable performance, i.e. the oil-based shaft stabilizing fluid for gas-liquid conversion. According to the invention, a mode of combining chemical and physical means is adopted; and while a well wall is prevented from being collapsed, the loading capacity of an open formation is improved, the possibility of wellbore instability and lost circulation in the gas-liquid conversion process is reduced, the unproductive time is shortened, the drilling effectiveness is improved and the drilling cost is saved.

Description

technical field [0001] The invention relates to a working fluid used in gas-liquid conversion in the oil and gas drilling process, in particular to an oil-based wellbore stabilizing fluid for gas-liquid conversion and a preparation method thereof. Background technique [0002] When the gas drilling process encounters complex formations such as unstable formations or water production (the current average well depth is 3000-3500m, and the bottom hole temperature is 80-100°C), it is necessary to convert the circulating fluid (air) into drilling fluid circulation. During the drilling process of air drilling conversion drilling fluid, because the well wall is exposed for a long time, after the drilling fluid is replaced into the wellbore, one is because the drilling fluid filtrate penetrates along the micro-fractures of the hard and brittle mudstone, forming a hydration film on the surface of the mudstone. The surface tension of the mudstone causes the cracking of the mudstone, w...

Claims

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Application Information

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IPC IPC(8): C09K8/502
Inventor 张军彭商平于志纲谢永斌杨飞彭波李斌
Owner 浙江仁智股份有限公司
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