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Composite salt low-activity anti-sloughing drilling fluid and construction method thereof

A drilling fluid and compound salt technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. Good, reduce the probability of differential pressure leakage, the effect of strong inhibition of the system

Inactive Publication Date: 2015-06-17
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the upper Liujiagou formation is rich in vertical fractures, and it is easy to cause differential pressure leakage during drilling.
The Liujiagou Formation, which is easy to leak in the upper part, and the Shihezi mudstone member, which is easy to collapse in the lower part, are both in the open hole section. The contradiction between leakage from the top and collapse from the bottom has become a bottleneck restricting the safe and rapid drilling of the Erkai horizontal well in the Sulige area. The spar is a weighted material, resulting in a high overall solid content in the mud, severe back pressure and large torque when sliding, which is prone to sticking and downhole drill tool failure accidents

Method used

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  • Composite salt low-activity anti-sloughing drilling fluid and construction method thereof
  • Composite salt low-activity anti-sloughing drilling fluid and construction method thereof
  • Composite salt low-activity anti-sloughing drilling fluid and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In 300 cubic meters of water, add 0.3% of drilling fluid viscosity enhancing agent PAC, 3% of carboxymethyl starch GD-K, 2% of water-dispersed cationic emulsified asphalt powder SFT-1, and 0.3% of anti-salt and anti-calcium in the formula Fluid loss reducer JT-1, 1% sulfonated phenolic resin SMP-2, 2% acid-soluble temporary plugging reservoir protection agent ZDS, 1% ultrafine calcium LG-130, 0.1% caustic soda NaOH are added to high-pressure mixing Mixing is carried out in the funnel, and after mixing evenly, the compound salt low-activity anti-slump drilling fluid is obtained.

Embodiment 2

[0055] In 300 cubic meters of water, add 0.25% of drilling fluid viscosity enhancing agent PAC, 2.5% of carboxymethyl starch GD-K, 1.7% of water-dispersed cationic emulsified asphalt powder SFT-1, and 0.25% of anti-salt and anti-calcium in the formula Fluid loss reducer JT-1, 1% sulfonated phenolic resin SMP-2, 2% acid-soluble temporary plugging reservoir protection agent ZDS, 1% ultra-fine calcium LG-130, 0.1% caustic soda NaOH, evenly added Mixing is carried out in the high-pressure mixing funnel, and the composite salt low-activity anti-slump drilling fluid is obtained after mixing evenly.

Embodiment 3

[0057] The kickoff point of Well Su 5-15-25H is 2615 meters deep (the bottom of Liujiagou is 2780 meters), and the mud system is converted at 2760 meters (well deviation 16°). The top of the Shiqianfeng Formation is dominated by reddish-brown mudstone, which is severely mud-forming, and the drill bit is prone to mud bagging. Before entering Shiqianfeng, WT-1 has a salt content as high as 10%, and the system has strong inhibition. The Shiqianfeng mudstone is formed and does not stick to the screen cloth. formula:

[0058] 0.2%PAC+0.2%JT-1+1%LG-130+2%ZDS+2%GD-K+1.5%SFT-1+1%SMP-2+0.1%NaOH+92%Water. (The above is abbreviated) Evenly add to the high-pressure mixing funnel for mixing, and after mixing evenly, the compound salt low-activity anti-slump drilling fluid is obtained.

[0059] Step 1) Drive the prepared compound salt low-activity anti-slump drilling fluid into the wellbore with a mud pump to replace the original drilling fluid in the wellbore;

[0060] Step 2) After spud...

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Abstract

The invention discloses a composite salt low-activity anti-sloughing drilling fluid and a construction method thereof. The composite salt low-activity anti-sloughing drilling fluid consists of the following raw materials in percentage by mass: 0.2-0.3% of drilling fluid viscosifier, 2-3% of carboxymethyl starch, 1.5-2% of aqueous dispersion cation emulsified asphalt, 0.2-0.3% of anti-salt anti-calcium filtrate reducer, 1% of sulfonated phenolic resin, 2% of acid-soluble temporary seal reservoir protective agent, 1% of superfine calcium, 0.1% of caustic soda and the balance of clean water. In construction, the composite salt accounting for 5-15% of the dosage of the composite slat low-activity anti-sloughing drilling fluid is added, and the composite salt is formed by mixing sodium formate and sodium chloride at a mass ratio of 2:1. By utilizing the composite salt, the function of chemically suppressing mudstone and preventing sloughing in the drilling fluid as well as the density of the drilling fluid are improved. With strong chemical suppression and low solid phase, the composite salt low-activity anti-sloughing drilling fluid completely meets the strict high-quality requirements of a long open-hole section for friction reduction and resistance reduction of the drilling fluid.

Description

technical field [0001] The invention relates to the technical field of drilling fluids in the exploration and development of oil and natural gas, in particular to a composite salt low-activity anti-slump drilling fluid and a construction method thereof. technical background [0002] When drilling in the horizontal section of the Sulige block, it is very easy to drill a large section of mudstone. After drilling mudstone, the drilling fluid density must be increased according to the length of the mudstone to achieve the effect of physical collapse prevention. However, there are abundant vertical fractures in the upper Liujiagou formation, and it is easy to cause differential pressure leakage during drilling construction. The Liujiagou Formation, which is prone to leakage in the upper part, and the Shihezi mudstone member, which is prone to collapse in the lower part, are both in the open hole section. The contradiction between leakage from top to bottom and collapse from top t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12E21B33/13
Inventor 陈华张建卿刘兆利周波李录科贾彦强孙志强石崇东
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司
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