Strong-sealing drilling fluid for preventing collapse of carbonaceous mudstone and preparation method

A technology of carbonaceous mudstone and drilling fluid, which is applied in the field of strong plugging drilling fluid and preparation of carbonaceous mudstone to prevent collapse. It can solve the problems that occur frequently, and achieve the effects of strong inhibition, increased production and good system performance.

Inactive Publication Date: 2016-12-14
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These systems basically meet the drilling requirements of normal well sections, but there are still deficienci

Method used

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Examples

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preparation example Construction

[0025] A method for preparing a strong plugging drilling fluid for carbonaceous mudstone collapse prevention, comprising the following steps:

[0026] Step 1) According to the needs of the site, a certain volume of water is filled in the slurry mixing tank;

[0027] Step 2) According to the above ratio, add the alkalinity control agent, viscosity increasing agent, fluid loss reducer, and plugging agent in the formulated amount into water under the action of the slurry pump, fully stir and mix evenly, and dissolve;

[0028] Step 3) Add liquid-phase weighting agent, anti-temperature agent, and inhibitor in proportion, stir and mix evenly, and dissolve;

[0029] Step 4) Add solid weighting agent according to on-site density requirements, and stir evenly;

[0030] Step 5) Add 1.0-2.0% lubricant according to the requirements for lubricity in field use.

Embodiment 1

[0032] This embodiment provides a carbonaceous mudstone anti-collapse strong plugging drilling fluid, including water and the following components in terms of mass percentage of water, 8% liquid phase weighting agent, 3% anti-temperature agent, inhibitor 3%, viscosifier 0.4%, fluid loss reducer 2.4%, plugging agent 6.5%, alkalinity control agent 0.1%, lubricant 1.0%, solid weighting agent 43%.

[0033] Preparation process: Put 100 cubic meters of water into the mixing tank; put 0.1 tons of alkalinity control agent, 0.4 tons of viscosity raising agent, 2.4 tons of fluid loss reducer, and 6.5 tons of plugging agent into the mixing pump. Add in water, mix well and dissolve; then add 8 tons of liquid phase weighting agent, 3 tons of anti-temperature agent, and 3 tons of inhibitor, mix well and dissolve; according to site requirements, add 1.0 tons of lubricating Agent, 43 tons of solid weighting agent, stir evenly, that is.

[0034] In the present embodiment, the alkalinity contr...

Embodiment 2

[0040] This embodiment provides a carbonaceous mudstone anti-collapse strong plugging drilling fluid, including water and the following components in terms of mass percentage of water, 5% liquid phase weighting agent, 3% anti-temperature agent, inhibitor 3%, viscosifier 0.4%, fluid loss reducer 2%, plugging agent 7.5%, alkalinity control agent 0.1%, lubricant 1.5%, solid weighting agent 39%.

[0041] Preparation process: Put 100 cubic meters of water into the slurry mixing tank; put 0.1 tons of alkalinity control agent, 0.4 tons of viscosity increasing agent, 2 tons of fluid loss reducer, and 7.5 tons of blocking agent into the slurry mixing pump Add in water, fully stir to mix and dissolve; then add 5 tons of liquid phase weighting agent, 3 tons of anti-temperature agent, and 3 tons of inhibitor, fully stir and mix and dissolve; according to the density requirements and lubricity requirements on site, According to the needs of the site, add 1.5 tons of lubricant and 39 tons o...

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Abstract

The invention provides strong-sealing drilling fluid for preventing collapse of carbonaceous mudstone. The strong-sealing drilling fluid is prepared from water and is further prepared from, by mass of water, 5-15% of liquid phase weighting agent, 3-5% of temperature resisting agent, 3-7% of inhibitor, 0.3-0.5% of tackifier, 2.0-3.0% of fluid loss agent, 4.0-8.0% of blocking agent, 0.1-0.15% of basicity control agent, 1.0-2.0% of lubricant and 30-50% of solid weighting agent. Through the synergistic effect of bridging, filling, deformation, the fluid lock effect and the like, a blocking layer formed on the surface of the well wall is compact in cementation and has a good blocking effect on micro-cracks; the situation that drilling fluid filtrate is immersed into mud rock micro-cracks is effectively reduced, the blocking performance is highlighted, and meanwhile other performance can be considered; liquid phase density is improved, the solid phase content is reduced, and adjustment of the rheological property of the drilling fluid is promoted; reservoir protection is promoted, and the yield of an oil-gas well is increased.

Description

technical field [0001] The invention belongs to the technical field of drilling in oil and gas fields, and in particular relates to a carbonaceous mudstone anti-slump strong plugging drilling fluid and a preparation method thereof, which are suitable for drilling in carbonaceous mudstone and mudstone formations with complex lithology in long horizontal sections. Background technique [0002] With the development of the Changqing gas field for more than 20 years, the physical properties of the target formations in the horizontal well blocks currently developed are relatively poor. In addition to the heterogeneity of the formation, the design length of the horizontal section is getting longer and longer, and some wells are horizontal The horizontal section is designed to be 2,000 meters long, and the horizontal section is generally designed to be 1,500 meters long. In this way, complex well sections, especially carbonaceous mudstone well sections, will inevitably be drilled dur...

Claims

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Application Information

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IPC IPC(8): C09K8/487C09K8/12C09K8/10
CPCC09K8/487C09K8/10C09K8/12C09K2208/08C09K2208/34
Inventor 陈恩让刘兆利张建斌杨斌曹辉赵建震赵雷蔺文洁丁磊王勇强赵海峰刘伟陈磊杨晓冰张长庚郭康凡帆
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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