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High-acid-solubility plugging liquid during drilling

A plugging while drilling and high-acid technology, which is applied in the field of oil well plugging, can solve the problems of excessive mineral particle density, high density and brittleness of mica sheets, and easy floating of mixed slurry, and achieve strong pressure bearing capacity, excellent hardness and flexibility , Improve the effect of the ability to support pores and cracks

Active Publication Date: 2018-08-24
KMS OIL FIELD CHEM & TECHNICAL SERVICES LTD BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are certain defects in the traditional plugging materials used for plugging, such as the density of mineral particles is too large and too brittle, it is easy to settle when mixing slurry, and it will disintegrate and break due to the closure of cracks after bridging; and the density of vegetable particles is If the pulp is too small, it is easy to float, and it will become soft after high temperature and high pressure
Traditional plugging materials such as shells and mica sheets have high density and are too brittle, so they are not easy to deform, and can easily form a shallow plugging layer around the well wall, which is easy to be damaged in subsequent operations and cause re-leakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Raw material preparation

[0051] (1) Drilling mud

[0052] Select the drilling mud used in the oil field.

[0053] (2) Aluminum alloy particles GYD

[0054] The density of aluminum alloy particles GYD is 2.3-2.6g / cm 3 , the fineness is 6.7-0.17mm.

[0055] (3) Superfine calcium

[0056] Use superfine calcium carbonate powder with a fineness of 300-600 mesh.

[0057] (4) Flexible polymer materials

[0058] (i) Preparation of (meth)acrylate rubber

[0059] (a) 50g n-butyl methacrylate and 8g tetrafluoroethylene are mixed homogeneously;

[0060](b) 1g benzoyl peroxide is added in 100g dimethylbenzene, and stir;

[0061] (c) adding the xylene solution in step (ii) to the monomer mixture in step (i), initiating a polymerization reaction at 60-90° C. to obtain (meth)acrylate rubber.

[0062] (ii) Preparation of flexible polymer materials

[0063] (a) adding 50 g of waste tire rubber powder and 50 g of (meth)acrylate rubber prepared in step (1) into a high-speed ...

Embodiment 2

[0072] 1. Raw material preparation

[0073] (1) Drilling mud

[0074] Select the drilling mud used in the oil field.

[0075] (2) Aluminum alloy particles GYD

[0076] The density of aluminum alloy particles GYD is 2.3-2.6g / cm3, and the fineness is 6.7-0.17mm.

[0077] (3) Superfine calcium

[0078] Use superfine calcium carbonate powder with a fineness of 300-600 mesh.

[0079] (4) Flexible polymer materials

[0080] (i) Preparation of (meth)acrylate rubber

[0081] (a) 60g of 2-ethylhexyl acrylate and 12g of ethylene difluoride are mixed uniformly;

[0082] (b) 1g benzoyl peroxide is added in 100g cyclohexanone, and stir;

[0083] (c) adding the xylene solution in step (ii) to the monomer mixture in step (i), initiating a polymerization reaction at 60-90° C. to obtain (meth)acrylate rubber.

[0084] (ii) Preparation of flexible polymer materials

[0085] (a) Add 45g of waste tire rubber powder and 55g of (meth)acrylate rubber prepared in step (1) into a high-speed o...

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Abstract

The invention discloses high-acid-solubility plugging liquid during drilling. The high-acid-solubility plugging liquid during drilling is prepared from the following components in percentage by weight: 2-4% of aluminum alloy particles GYD, 3-5% of flexible polymer materials, 4-5% of superfine calcium and the balance of drilling fluid. The high-acid-solubility plugging liquid during drilling has anacid solubility rate of 80% or higher, and can be used in oil-based drilling fluid. The high-acid-solubility plugging liquid during drilling further has a relatively good bridge plugging function anda relatively good filling function, and has a very good plugging effect for pore and seam type leakage.

Description

technical field [0001] The invention relates to the technical field of oil well plugging, in particular to a highly acid-soluble plugging fluid while drilling. Background technique [0002] Lost circulation refers to a complex situation in which drilling fluid leaks into the formation during the drilling process of oil and gas exploration and development. During the drilling process, a large amount of drilling fluid leakage not only delays the drilling cycle, but also causes huge economic losses. Therefore, efficient leakage prevention and plugging technology must be adopted. [0003] At present, the most widely used drilling leakage prevention and plugging technology is bridging plugging technology, which requires bridging materials with high compressive strength; meanwhile, the plugging materials should also have certain temperature resistance, salt resistance and alkali resistance to meet different downhole conditions. At present, conventional bridging materials mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467
Inventor 张宁李磊尹达宴志航刘锋报吴全鹤黄超
Owner KMS OIL FIELD CHEM & TECHNICAL SERVICES LTD BEIJING
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