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High-density oil-based drilling fluid plugging liquid and preparation method and application thereof

An oil-based drilling fluid and high-density technology, which is applied in the field of oil well plugging, can solve the problems of unfavorable oil layer acidification reform, easy subsidence or floating, and high overall concentration of plugging fluid, so as to improve the ability and hardness of supporting pores and fractures Excellent flexibility and high compressive strength

Active Publication Date: 2018-07-20
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

Traditional plugging materials have certain defects when used for plugging, such as poor dispersion in high-density oil-based mud, easy to settle or float, and high temperature resistance, low compressive strength, and low overall acid solubility. As a result, the overall concentration of the plugging fluid is high, and the particle size distribution of the plugging fluid material is single. During the process of plugging while drilling, the size of the plugging fracture must match the pore size, which has limitations. After the plugging fluid enters the formation, it is not conducive to the acidification of the oil layer in the later stage. transform

Method used

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  • High-density oil-based drilling fluid plugging liquid and preparation method and application thereof
  • High-density oil-based drilling fluid plugging liquid and preparation method and application thereof
  • High-density oil-based drilling fluid plugging liquid and preparation method and application thereof

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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) Non-penetration treatment agent BYD

[0056] (4) High acid soluble calcium granule KGD

[0057] High acid soluble calcium granules KGD, density 2.6-2.7g / cm 3 , the particle size is 0.3mm ~ 3.00mm.

[0058] 2. Preparation of high-density oil-based drilling fluid plugging fluid

[0059] Prepare high-density oil-based drilling fluid plugging fluid according to the following weight percentages:

[0060] Aluminum alloy particles GYD (6.7-4mm) 1%, aluminum alloy particles GYD (4.0-1.4) 1%, aluminum alloy particles GYD (1.4-0.28mm) 1%; aluminum alloy particles GYD (0.28-0.17mm) 1%.

[0061] Non-permeable treatment agent BYD 5%; high acid soluble calcium particles KGD (0.3mm ~ 0.45mm) 2%, high acid soluble ca...

Embodiment 2

[0064] 1. Raw material preparation

[0065] (1) Drilling mud

[0066] Select the drilling mud used in the oil field.

[0067] (2) Aluminum alloy particles GYD

[0068] The density of aluminum alloy particles GYD is 2.3-2.6g / cm 3 , the fineness is 6.7-0.17mm.

[0069] (3) Non-penetration treatment agent BYD

[0070] (4) High acid soluble calcium granule KGD

[0071] High acid soluble calcium granules KGD, density 2.6-2.7g / cm 3 , the particle size is 0.3mm ~ 3.00mm.

[0072] (5) Flexible polymer materials

[0073] (i) Preparation of (meth)acrylate rubber

[0074] (a) 60g of 2-ethylhexyl acrylate and 12g of ethylene difluoride are mixed uniformly;

[0075] (b) 1g benzoyl peroxide is added in 100g cyclohexanone, and stir;

[0076] (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.

[0077] (ii) Preparation of flexible polymer materials

[0078] (a) Add 45g of...

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Abstract

The invention discloses a high-density oil-based drilling fluid plugging liquid which comprises, by weight percentage, 3-6% of aluminum alloy particles GYD, 5-6% of non-permeating treatment agent BYD,3-9% of high acid soluble calcium particles KGD, and the balance drilling fluid. The high-density oil-based drilling fluid plugging liquid has good dispersion in high-density oil-based mud, does notsettle, does not float and has high temperature resistance, high compressive strength and high overall acid solubility, the overall concentration of the plugging liquid is not high, and the plugging liquid is favorable for acidification transformation of a later oil layer after entering the formation.

Description

technical field [0001] The invention relates to the technical field of oil well plugging, in particular to a high-density oil-based drilling fluid plugging fluid and its preparation method and application. Background technique [0002] With the increasing development of domestic unconventional oil and gas resources, the demand for oil-based drilling fluids is also increasing. Oil-based drilling fluid mainly refers to the water-in-oil emulsified drilling fluid that uses diesel or low-toxic mineral oil as the continuous phase and water as the dispersed phase under certain conditions and exhibits some properties similar to oil. In the drilling process of oil and gas exploration and development, the leakage of drilling fluid into the formation will form lost circulation. Lost circulation is a complex problem in the process of drilling, cementing, logging and workover. This not only delays the drilling cycle, consumes a lot of mud and plugging materials, but also may cause major...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 张宁尹达李磊宴志航刘锋报吴全鹤黄超
Owner KMS OIL FIELD CHEM & TECHNICAL SERVICES LTD BEIJING
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