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 blow

Method used

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

Examples

Experimental program
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Effect test

Example Embodiment

[0022] Example 1 A drilling fluid with strong inhibition, anti-collapse and low damage was prepared from the following components, using 85.3% by weight of clean water, 5% by weight of silicate, and 0.8% by weight of cationic inhibitor, plus hydrolysis and polymerization. The weight ratio of acrylamide is 0.5%, the weight ratio of adding viscosity cutting agent is 0.3%, the weight ratio of fluid loss agent is 2%, the weight ratio of barite is 6%, and the weight ratio of formaldehyde is 0.1%. Low damage drilling fluid.

[0023] 1. Example 1 Evaluation experiment of anti-collapse and inhibitory performance of the strong inhibitory anti-collapse low-damage drilling fluid

[0024] Test 1: The shale cuttings recovery evaluation experiment of the drilling fluid of Example 1

[0025] In this experiment, the shale cuttings recovery rate of the drilling fluid was tested to characterize the strength of the anti-collapse and inhibition of the drilling fluid. That is, 50 grams of cuttings from ...

Example Embodiment

[0058] Example 2

[0059] The following components are used to formulate a drilling fluid with strong inhibition, anti-collapse and low damage, using 89.65% by weight of clean water, 3% by weight of silicate, 1.0% by weight of small cationic inhibitor, and weight of hydrolyzed polyacrylamide. The weight ratio is 0.8%, the weight ratio of the viscosity cutting agent is 0.5%, the weight ratio of the fluid loss agent is 1%, the barite 4%, and the preservative formaldehyde 0.05% is mixed to make a strong inhibitory, anti-collapse, low-damage drilling fluid.

Example Embodiment

[0060] Example 3

[0061] The following components are used to formulate a strong inhibitory, anti-collapse, low-damage drilling fluid, using 88.42% by weight of clean water, 4% by weight of silicate, 0.5% by weight of small cationic inhibitor, and weight of hydrolyzed polyacrylamide. The ratio is 0.6%, the weight ratio of the viscosity cutting agent is 0.4%, the weight ratio of the fluid loss agent is 3%, the weight ratio of barite is 3%, and the preservative formaldehyde 0.08% is mixed to make a strong inhibitory, anti-collapse, low-damage drilling fluid.

[0062] In the application of Examples 2 and 3, the system also showed long-term anti-collapse and strong suppression, good plugging effect and lubrication and drag reduction effect, stable wellbore and regular wellbore during drilling, and well completion during completion. The pipe string descends smoothly 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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