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Environment-friendly anti-collapse plugging drilling fluid as well as preparation method and application thereof

A drilling fluid, environmental protection technology, applied in the field of environmental protection anti-slump plugging drilling fluid and its preparation, can solve the problems of drilling fluid pollution, poor suspension of oil-based drilling fluid, high viscosity, etc.

Active Publication Date: 2020-10-20
XINJIANG BEIKEN ENERGY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based drilling fluids mainly have the following problems: 1. Under the premise of meeting environmental protection requirements, the existing plugging and anti-slump materials are limited, which seriously affects the plugging and anti-slumping performance of drilling fluids; 2. Under the premise of meeting environmental protection requirements, the existing There are problems with the temperature resistance of each treatment agent material, and the temperature resistance is poor
Oil-based drilling fluids mainly have the following problems: 1. High viscosity and low shear force make the suspension of oil-based drilling fluids poor, which is not conducive to the preparation of suspended drilling cuttings, heavy materials and ultra-high-density oil-based drilling fluids ; 2. It is easy to cause the emulsion stability to deteriorate due to the intrusion of hydrophilic substances; 3. The rheology of oil-based drilling fluid is significantly affected by temperature. In the actual drilling process, the temperature of the drilling fluid in the well increases with the increase of well depth. 4. The problem of drilling fluid pollution. Waste oil-based drilling fluid contains a large amount of mineral oil, phenolic compounds, heavy metals and some toxic substances, which are hazardous wastes. , long-term accumulation will cause serious damage to surface vegetation, lead to pollution of soil, surface and groundwater, directly or indirectly cause great harm to plants, animals and human health, and greatly restrict the development of oil-based drilling fluid technology
However, due to the pressure of environmental protection, the promotion and use of oil-based drilling fluids has been restricted.

Method used

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  • Environment-friendly anti-collapse plugging drilling fluid as well as preparation method and application thereof
  • Environment-friendly anti-collapse plugging drilling fluid as well as preparation method and application thereof
  • Environment-friendly anti-collapse plugging drilling fluid as well as preparation method and application thereof

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preparation example Construction

[0037] In the present invention, the preparation method of the plugging agent preferably comprises the following steps:

[0038] (1) dissolving polypropylene alcohol in water and stirring evenly, adding epichlorohydrin to it to obtain raw material mixture I;

[0039] (2) Dissolving 2-acrylamide-2-methylpropanesulfonic acid in water, adding sodium hydroxide to control pH = 6-7, then adding acrylamide and mixing evenly to obtain raw material mixture II;

[0040] (3) Add a cross-linking agent to the raw material mixture I, control the cross-linking reaction time to be 1-2 hours, add the raw material mixture II and the initiator during this period, adopt nitrogen protection, and carry out graft copolymerization reaction at 60°C, and the obtained product Dehydration and crushing are carried out in sequence to obtain the plugging agent.

[0041] In the present invention, it is preferred to dissolve polypropylene alcohol in water and stir evenly, and then add epichlorohydrin therein...

Embodiment 1

[0070] Preparation of plugging agent:

[0071] (1) Dissolve 60 parts of polypropylene alcohol in water and stir evenly, add 30 parts of epichlorohydrin to it to obtain raw material mixture I;

[0072] (2) Dissolve 7 parts of 2-acrylamide-2-methylpropanesulfonic acid in water, add sodium hydroxide to control pH = 6-7, then add 3 parts of acrylamide and mix well to obtain raw material mixture II;

[0073] (3) Add 0.6 part of amide compound to raw material mixture I, then add raw material mixture II, 0.5 part of ammonium persulfate and 0.5 part of benzoyl peroxide, stir evenly, use nitrogen protection, and carry out graft copolymerization at 60 °C reaction, the obtained product is dehydrated and pulverized to obtain a plugging agent.

[0074] Preparation of anti-collapse agent:

[0075] (1) Dissolve 12 parts of the hydrophilic monomer 2-acrylamide-2-methylpropanesulfonic acid in 50 parts of water, add sodium hydroxide to control pH = 6-7, add 24 parts of acrylamide and mix even...

Embodiment 2

[0084] Prepare water-based drilling fluid according to the method of Example 1, the difference is that 100 parts of water; 2 parts of sodium bentonite, 0.3 parts of pH regulator (the mass ratio of sodium hydroxide and sodium carbonate is 1:2), polyanionic fiber 0.5 parts of element, 0.1 part of partially hydrolyzed polyacrylamide, 1.5 parts of carboxymethyl starch, 5 parts of potassium sulfate, 2 parts of polyether diamine, 2 parts of polyether polyol, 3 parts of blocking agent, 0.6 part of anti-slump agent, Xanthan gum 0.12 parts, density 4.2g / cm 3 And barite with a purity of 95%, adjust the density of the drilling fluid to 1.80g / cm 3 .

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Abstract

The invention provides an environment-friendly anti-collapse plugging drilling fluid as well as a preparation method and an application thereof, which belong to the field of drilling fluids for petroleum drilling engineering. The invention provides the environment-friendly anti-collapse plugging drilling fluid, which comprises: 100 parts of water, 1-3 parts of sodium bentonite, 0.2-0.4 parts of apH value regulator, 0.3-0.5 part of a glue protecting agent, 0.1-0.2 part of a coating agent, 1-2 parts of a filtrate reducer, 4-6 parts of inorganic salt, 1-3 parts of an inhibitor, 1-3 parts of a lubricant, 2-4 parts of a blocking agent, 0.3-0.8 part of an anti-collapse agent, 0.1-0.15 part of a flow pattern regulator and 0-100 parts of a weighting agent. The drilling fluid provided by the invention is good in rheological property and filtrate loss reduction property, the HTHP filtrate loss and PPT filtrate loss at 150 DEG C are remarkably reduced, a mud cake is thin and compact, borehole wall instability caused by pore pressure increase due to the fact that too much drilling fluid filtrate enters a stratum can be prevented, and the drilling fluid is non-toxic and easy to degrade.

Description

technical field [0001] The invention relates to the field of drilling fluid for petroleum drilling engineering, in particular to an environment-friendly anti-slump plugging drilling fluid and a preparation method and application thereof. Background technique [0002] In the development of oil and gas fields, horizontal well drilling technology was first proposed in the 1920s, initially applied in the 1940s, and promoted successively in the United States, Canada, France and other countries in the 1980s. With the deepening of surface conditions, underground conditions, reservoir conditions, exploration and development, and the application of geosteering technology, the international horizontal well drilling technology is becoming more and more mature and perfect. Our country began to explore in the 1960s, and began large-scale research and application in the 1990s. With the continuous research of horizontal well drilling technology, drilling and completion fluids and well com...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/24E21B33/13
CPCC09K8/467C09K8/24E21B33/13Y02P20/141
Inventor 张世攀何淼张智君许明标李明吴宇赵海存由福昌孔德斌孔德宏
Owner XINJIANG BEIKEN ENERGY ENG
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