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Oil well reservoir fracture plugging agent, and preparation method and application thereof

A plugging agent and oil well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as leakage, buried hill fracture reservoir damage, etc., to achieve safe use and good plugging effect , the effect of protecting oil and gas layers

Active Publication Date: 2015-05-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that the current buried hill fracture reservoirs are prone to leakage, and conventional drilling plugging agents can cause damage to buried hill fracture reservoirs, and provides an acid-soluble, oil-soluble and degradable buried-hill fracture reservoir drilling plugging agent. Leaked dose

Method used

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  • Oil well reservoir fracture plugging agent, and preparation method and application thereof
  • Oil well reservoir fracture plugging agent, and preparation method and application thereof
  • Oil well reservoir fracture plugging agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The components and weight ratio of the drilling lost circulation agent are: 14% of nylon 66, 15% of DSP-2, 34% of No. 90 asphalt, 14% of delayed expansion agent YH-14%, and 33% of calcium carbonate particles.

[0044] Wherein the components and weight ratio of nylon 66 are: 15-25mm nylon 6675%, 5-15mm nylon 6625%. The composition and weight ratio of No. 90 asphalt are: 50% of No. 90 asphalt of about 1mm, 25% of No. 90 asphalt of about 3mm, and 25% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 85% of the 200-mesh superfine calcium particles and 15% of the 3-4mm calcium carbonate particles.

[0045] When preparing, first add DSP-2 into water to fully dissolve to form a base slurry with a viscosity of 100-120S, and then mix it with other components in the formula evenly.

[0046] Aiming at the leakage in the completion process of buried hill wells, the plugging product prepared above was used for a pressure test, ...

Embodiment 2

[0053] Nanpu 23-P2006 is a development well in the buried hill reservoir of Nanpu No. 2 structure, and the main target interval is the Ordovician oil and gas layer in the buried hill. On April 26, 2011, when the well was drilled at a depth of 5235 meters, a lost circulation occurred in a fracture in a buried hill, and lost circulation occurred. The plugging slurry was prepared according to the following formula: nylon 6615%, DSP-210%, No. 90 bitumen 25%, delayed expansion agent YH-14%, calcium carbonate particles 35%, the balance is water.

[0054] Wherein the components and weight ratio of nylon 66 are: 15-25mm nylon 6660%, 5-15mm nylon 6640%. The composition and weight ratio of No. 90 asphalt are: 45% of No. 90 asphalt of about 1mm, 30% of No. 90 asphalt of about 3mm, and 25% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 75% of the 200-mesh superfine calcium particles and 25% of the 3-4mm calcium carbonate particles...

Embodiment 3

[0062] Well Gao 3102-9 is a planned well with three openings and five intervals on the Gao 96 platform. When the well was drilled to 3756 meters, a loss of return occurred suddenly; after 2 conventional plugging failed, the plugging was carried out according to the following formula: Nylon 6610 %, DSP-25%, No. 90 asphalt 25%, delayed expansion agent YH-15%, calcium carbonate particles 34%, and the balance is water.

[0063] The composition and weight ratio of the fiber material are: 15-25mm nylon 6670% and 5-15mm nylon 6630%. The composition and weight ratio of No. 90 asphalt are: 55% of No. 90 asphalt of about 1mm, 25% of No. 90 asphalt of about 3mm, and 20% of No. 90 asphalt of about 6mm. The composition and weight ratio of the calcium carbonate particles are: 65% of the 200-mesh superfine calcium particles and 35% of the 3-4mm calcium carbonate particles.

[0064] The prepared plugging slurry was pumped into the leaky layer, and the leak plugging was stopped when the drill...

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Abstract

The invention relates to an oil well reservoir fracture plugging agent, and a preparation method and application thereof. The plugging agent comprises the following components in percentage by weight: 10-15% of acid-soluble fiber material, 5-15% of degradable high molecular compound, 25-35% of oil-soluble inert particle material, 4-5% of degradable delay expanding agent, 28-35% of acid-soluble inorganic salt and the balance of water, preferably 14% of acid-soluble fiber material, 4-14% of degradable high molecular compound, 34% of oil-soluble inert particle material, 4% of degradable delay expanding agent, 34% of acid-soluble inorganic salt and the balance of water. According to the invention, the plugging agent is prepared and formed from the acid-soluble, oil-soluble and degradable materials by combining the three characteristics of matching long and short fibers, matching coarse and fine particles and matching soft and hard filling materials; and the plugging agent can be applicable to the plugging of a fracture-width-uncertain stratum of a burial hill.

Description

technical field [0001] The invention relates to an oil well reservoir fissure plugging agent, its preparation method and its application. Background technique [0002] Lost circulation is a common downhole complication during drilling. Lost circulation, especially in buried hill sections, not only consumes drilling fluid, causes damage to reservoirs, prolongs drilling time, increases drilling costs, but also easily leads to complex downhole situations, such as pipe sticking, well collapse, blowout, etc. Lost circulation in the section is often accompanied by well kick and hydrogen sulfide production, which increases the risk of well control. After a large amount of lost circulation, it is impossible to continue drilling and reach the well depth required by geological conditions. In order to block the leakage layer, various plugging materials must be used to build a barrier in the leakage passage in the close range of the wellbore to block the leakage passage. At present, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42E21B33/13
Inventor 朱宽亮徐小峰王在明侯怡周岩陈春来姜薇胡中志李睿徐吉
Owner PETROCHINA CO LTD
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