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Strongly-inhibitive collapse-prevention low-damage drilling fluid

A strong suppression and drilling fluid technology, applied in the field of drilling fluid, can solve problems such as process plugging, well wall collapse, and reservoir pollution, and achieve the effects of improving lubrication and drag reduction, protecting reservoirs, and preventing hydration

Inactive Publication Date: 2013-05-01
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If leakage occurs, it will bring the risk of well wall collapse and blowout, and process plugging will bring the risk of polluting the reservoir

Method used

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  • Strongly-inhibitive collapse-prevention low-damage drilling fluid
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  • Strongly-inhibitive collapse-prevention low-damage drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Prepare a strong inhibitory anti-slump and low-damage drilling fluid from the following components. According to the weight percentage, use 85.3% by weight of clean water, add 5% by weight of silicate, add 0.8% by weight of small cationic inhibitor, and add hydrolysis and polymerization 0.5% by weight of acrylamide, 0.3% by weight of sticky cutting agent, 2% by weight of fluid loss agent, 6% by weight of spar, and 0.1% by weight of formaldehyde to make a strong inhibitory anti-slump Low damage drilling fluid.

[0023] 1. Example 1 Anti-slump inhibition evaluation experiment of strong inhibitory anti-slump and low-damage drilling fluid

[0024] Test 1: Evaluation experiment of the shale cuttings recovery rate of the drilling fluid in Example 1

[0025] This test characterizes the strength of the anti-slump inhibition of the drilling fluid by testing the shale cuttings recovery rate of the drilling fluid, that is, adding 50 grams of cuttings of the Zhiluo Forma...

Embodiment 2

[0059] Prepare strong inhibitory anti-slump and low-damage drilling fluid from the following components, according to the weight percentage, use 89.65% by weight of clean water, add 3% by weight of silicate, add 1.0% by weight of small cationic inhibitor, and add by weight of hydrolyzed polyacrylamide Add 0.8% viscous agent, 0.5% weight ratio of fluid loss agent, 4% weight spar, 0.05% preservative formaldehyde to make strong inhibitory anti-slump and low-damage drilling fluid.

Embodiment 3

[0061] Prepare strong inhibitory anti-slump and low-damage drilling fluid from the following components, according to the weight percentage, use 88.42% by weight of clean water, add 4% by weight of silicate, add 0.5% by weight of small cationic inhibitor, and add by weight of hydrolyzed polyacrylamide 0.6% by weight, 0.4% by weight of viscous agent, 3% by weight of water loss agent, 3% by weight of spar, and 0.08% of preservative formaldehyde to make a strong inhibitory anti-slump and low-damage drilling fluid.

[0062] In the application of Examples 2 and 3, this system also exhibits strong anti-slump and inhibition for a long time, good plugging effect and lubrication and drag reduction effect, stable and regular wellbore during drilling, and well completion during well completion. The pipe string was successfully lowered into the bottom of the well.

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Abstract

The invention relates to the technical field of a drilling fluid, and discloses a strongly-inhibitive collapse-prevention low-damage drilling fluid, which comprises the following components in percentage by weight: silicate 2-5%, small cation inhibitor 0.5-1.0%, hydrolyzed polyacrylamide 0.3-0.8%, viscosity enhancer 0.3-0.5%, water-loss control agent 1-3%, barite 0-6%, formaldehyde 0.05-0.1%, andthe balance of water. The drilling fluid disclosed by the invention has the characteristics of long-duration collapse-prevention property, strong inhibitory effect, good clogging effect, smooth, dense and film-like slurry cake, good lubricating property, low damage to low-porosity low-permeability low-abundance reservoir beds, and simple and feasible formula and slurry preparation method, and canincrease the pressure-bearing capacity of the formation.

Description

technical field [0001] The present invention relates to the technical field of drilling fluids, in particular to a highly inhibitive anti-slump and low-injury anti-slump solution suitable for safe drilling and completion of deviated well sections and horizontal sections under the condition of branch wells and horizontal wells in the open hole section. drilling fluid. Background technique [0002] Sulige Gas Field is one of the super-large onshore gas fields in China, and it is also a tight sandstone gas field with “three lows” (low permeability, low pressure, and low abundance) that is rare in the world. It is even ultra-low permeability in some blocks. Technology cannot effectively develop this gas field, making exploration and development extremely difficult. In order to greatly increase the production of a single well and explore a new technical approach for the economical and effective development of low-permeability gas fields, a pilot test of double-branched horiz...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor 杨斌黎金明陈在君俞浩杰金祥哲赵海峰刘学惠
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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