Solid-free strong inhibition foam drilling fluid

A drilling fluid and strong suppression technology, applied in petroleum, coalbed methane exploitation, and natural gas fields, can solve the problems of weak anti-pollution ability, unstable foam system, poor temperature resistance, etc., and achieve low cost, which is conducive to popularization and application, and good The effect of dynamic shear force and dynamic plastic ratio

Active Publication Date: 2014-12-24
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

At present, domestic research on foam drilling fluid is still in its infancy, and there are still problems such as unstable foam system, poor temperature resistance, and weak anti-pollution ability.

Method used

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  • Solid-free strong inhibition foam drilling fluid
  • Solid-free strong inhibition foam drilling fluid
  • Solid-free strong inhibition foam drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of the non-solid-phase strongly suppressed foam drilling fluid described in this embodiment is composed of: 100g of water, 0.25g of soda ash, 0.5g of foam stabilizer (xanthan gum), inhibitor (BZ-JAI, Bohai Drilling Engineering Technology Research Institute) 1g, fluid loss reducer 1g (among them, modified starch 0.5g, white asphalt 0.5g), high-efficiency foaming agent 0.5g (among them, sodium dodecylsulfonate 0.25g, α-olefin sulfonic acid Sodium 0.25g), add soda ash, foam stabilizer, inhibitor, fluid loss reducer in proportion to the state of stirring at 10000 rpm in turn to prepare the base liquid, then slowly add high-efficiency foaming agent under stirring at 8000 rpm agent, and continued to stir for 3 minutes to obtain the foam drilling fluid.

Embodiment 2

[0018] The preparation method of foam drilling fluid described in the present embodiment is composed of: water 100g, soda ash 0.30g, foam stabilizer 0.8g (wherein, xanthan gum 0.5g, polyanion cellulose 0.3g), inhibitor (BZ- JAI, produced by Bohai Drilling Engineering Technology Research Institute) 1.5g, fluid loss reducer 2g (among them, modified starch 1.0g, white asphalt 1.0g), high-efficiency foaming agent 0.75g (among them, sodium dodecylsulfonate 0.5 g, α-olefin sulfonate sodium 0.25g), add soda ash, foam stabilizer, inhibitor, fluid loss reducer under the state of stirring at 10000 revs / min rotating speed successively in proportion, make base liquid, then 8000 revs / min rotating speed Slowly add the high-efficiency foaming agent under stirring, and continue stirring for 3 minutes to obtain the foam drilling fluid.

Embodiment 3

[0020] The preparation method of foam drilling fluid described in the present embodiment is composed of: water 100g, soda ash 0.32g, foam stabilizer 1g (wherein, xanthan gum 0.5g, carboxymethyl cellulose 0.5g), inhibitor (BZ- JAI, produced by Bohai Drilling Engineering Technology Research Institute) 1g, fluid loss reducer 2g (among them, modified starch 1.0g, white asphalt 1.0g), high-efficiency foaming agent 1g (among them, sodium dodecylsulfonate 0.5g, Sodium α-olefin sulfonate 0.5g), add soda ash, foam stabilizer, inhibitor, fluid loss reducer under the stirring state of 10000 rev / min rotating speed successively in proportion, make base liquid, then 8000 rev / min rotating speed stirring Slowly add high-efficiency foaming agent and continue stirring for 3 minutes to obtain the foamed drilling fluid.

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PUM

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Abstract

The invention relates to solid-free strong inhibition foam drilling fluid and a preparation method thereof. The solid-free strong inhibition foam drilling fluid comprises the following components in parts by mass: 100 parts of water, 0.25-0.35 part of sodium carbonate, 0.5-1.5 parts of a foam stabilizer, 1-2 parts of an inhibitor, 1-2 parts of a filtrate reducer and 0.5-1 part of a high-efficiency foaming agent. The foam drilling fluid has high foaming capacity, excellent yield value and ratio of dynamic shear force and good suspendability as well as relatively high inhibition and proper water loss, and the application range of the foam drilling fluid is widened.

Description

technical field [0001] The invention relates to the fields of petroleum, natural gas and coal bed methane exploitation, in particular to a drilling fluid with strong suppression of solid-phase foam. Background technique [0002] Drilling fluid is one of the necessary materials used to balance formation pressure and ensure safe and smooth drilling during drilling. The foam drilling fluid has low density and strong inhibition, and the formed "micro-foam" has strong sealing ability, which can well guarantee the wellbore quality and reservoir protection requirements. Although foam has not been used as a circulating medium in drilling operations for a long time, it has gradually become popular due to its advantages such as low hydrostatic column pressure, small filtration loss, good sand-carrying performance, low friction loss, strong drainage ability, and little damage to oil layers. arouse people's interest. With the development of the petroleum industry, the number of deep a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38
CPCC09K8/38
Inventor 张洪伟赵福祥曹靖瑜左凤江田野贾东民杨学梅程智尹静刘彦妹田惠
Owner BC P INC CHINA NAT PETROLEUM CORP
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