An environmentally friendly lubrication inhibitor for drilling fluid

Abstract

The invention discloses an environmentally friendly lubrication inhibitor for drilling fluid. The lubrication inhibitor comprises the following components in parts by weight: 10-30 parts of N,N-diallylacrylamide, 10-30 parts of sodium castor oil sulfonate, 3-8 parts of polyol, 3-6 parts of polyether, 3-5 parts of mineral oil, 3-5 parts of emulsifier, 4-8 parts of filler, and 30-50 parts of water. The lubrication inhibitor for drilling fluid of the invention can reduce the friction coefficient between the drill tool and the well wall, prevent the drill from sticking, increase the drilling speed, and inhibit the hydration expansion of shale, protect the oil and gas layer, and is suitable for low-density and high-density drilling fluids.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling fluid, and in particular relates to an environmentally friendly lubrication inhibitor for drilling fluid. Background Art

[0002] Lubrication inhibitors for drilling fluids are important additives used to improve the performance of drilling fluids. Their main function is to reduce the friction resistance between the drill bit and the wellbore during drilling, while inhibiting the hydration and expansion of shale to prevent accidents such as wellbore instability and stuck pipe. Existing lubrication inhibitors include polyethylene glycol, alcohol ether polymers, and methyl glucoside. Polyethylene glycol (PEG) is an environmentally friendly, non-toxic lubrication inhibitor that can significantly reduce the friction coefficient of the filter cake, and enhance the anti-wear performance by forming a hydrophobic film on the surface of montmorillonite and combining with the terminal hydroxyl group of polyaspartic acid (PA) molecules to form a lubricating film; alcohol ether polymer is a new type of inhibitor lubricant for drilling fluids, which has good shale inhibition and lubricity, can effectively stabilize the wellbore, reduce the friction resistance of the drill bit, and protect the oil and gas layer; methyl glucoside (MEG) is also a commonly used lubrication inhibitor with good environmental performance. The recommended dosage is 5% to 7%, which can significantly reduce the lubrication coefficient and shale expansion rate.

[0003] In the horizontal well development of Sulige gas field, by optimizing the composite salt drilling fluid system, combining aminosilanol and lubricant LUBE, the wellbore stability and lubrication performance were significantly improved, and the hydration expansion and friction of mudstone were reduced; in the complex formation drilling of Daqing Oilfield, the inhibitor DQHIB-Ⅰ and lubricant LRH were used as core treatment agents to form a high-performance water-based drilling fluid with strong inhibition, strong plugging and high lubricity, which successfully solved the problems of wellbore instability and high friction. The application research of alkyl polyglycosides and their derivatives in drilling fluids shows that the modified alkyl polyglycoside derivatives have strong inhibition and high lubricity, which is the research direction of high-performance water-based drilling fluids in the future. As a new type of shale inhibitor and lubricant, polyether polyols are non-toxic and biodegradable, and are suitable for deepwater drilling and shale gas well drilling. Lubrication inhibitors for drilling fluids play an important role in improving drilling efficiency, protecting oil and gas layers, and meeting environmental protection requirements. With the continuous advancement of technology, the research and development and application of new lubrication inhibitors will be more extensive. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly lubricity inhibitor for drilling fluid.

[0005] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 10-30 parts of N,N-diallylacrylamide, 10-30 parts of sodium castor oil sulfonate, 3-8 parts of polymeric alcohol, 3-6 parts of polyether, 3-5 parts of mineral oil, 3-5 parts of emulsifier, 4-8 parts of filler and 30-50 parts of water.

[0006] The polymer alcohol is one or more of polyethylene glycol, polypropylene glycol, polybutylene adipate, and polytetrahydrofuran glycerol.

[0007] The polyether is one or more of polyethylene oxide, polypropylene oxide, polytetrahydrofuran, and fatty alcohol polyoxypropylene ether.

[0008] The mineral oil is one or more of paraffin oil, white oil and microcrystalline wax.

[0009] The emulsifier is one or more of sodium lauryl sulfate, sodium stearate, gum arabic, agar, pectin and carrageenan.

[0010] The filler is one or more of attapulgite, diatomite and dolomite powder.

[0011] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polyol, polyether, mineral oil, emulsifier, filler and water, and stirring at 500-1200 rpm for 10-30 minutes.

[0012] Beneficial effects of the present invention: The lubrication inhibitor for drilling fluid of the present invention can reduce the friction coefficient between the drill tool and the well wall, prevent the drill from getting stuck, and increase the drilling speed. At the same time, it can inhibit the hydration expansion of shale and protect the oil and gas layer. It is suitable for low-density and high-density drilling fluids. DETAILED DESCRIPTION

[0013] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0014] Example 1

[0015] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 20 parts of N,N-diallylacrylamide, 20 parts of sodium castor oil sulfonate, 6 parts of polyethylene glycol, 4 parts of polyethylene oxide, 4 parts of paraffin oil, 4 parts of sodium lauryl sulfate, 6 parts of attapulgite, and 40 parts of water.

[0016] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polyethylene glycol, polyethylene oxide, paraffin oil, sodium lauryl sulfate, attapulgite and water, and stirring at 800 rpm for 20 minutes.

[0017] Example 2

[0018] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 12 parts of N,N-diallylacrylamide, 12 parts of sodium castor oil sulfonate, 3 parts of polypropylene glycol, 3 parts of polyoxypropylene, 3 parts of white oil, 3 parts of sodium stearate, 4 parts of diatomaceous earth and 30 parts of water.

[0019] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polypropylene glycol, polyoxypropylene, white oil, sodium stearate, diatomaceous earth and water, and stirring at 500 rpm for 30 minutes.

[0020] Example 3

[0021] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 30 parts of N,N-diallylacrylamide, 30 parts of sodium castor oil sulfonate, 8 parts of polybutylene adipate, 6 parts of polytetrahydrofuran, 5 parts of microcrystalline wax, 5 parts of gum arabic, 8 parts of dolomite powder and 50 parts of water.

[0022] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polybutylene adipate, polytetrahydrofuran, microcrystalline wax, gum arabic, dolomite powder and water, and stirring the mixture at 1200 rpm for 12 minutes.

[0023] Example 4

[0024] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 18 parts of N,N-diallylacrylamide, 18 parts of sodium castor oil sulfonate, 4 parts of polytetrahydrofuran glycerol, 6 parts of fatty alcohol polyoxypropylene ether, 5 parts of microcrystalline wax, 3 parts of agar, 6 parts of diatomaceous earth and 45 parts of water.

[0025] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polytetrahydrofuran glycerol, fatty alcohol polyoxypropylene ether, microcrystalline wax, agar, diatomaceous earth and water, and stirring at 1000 rpm for 20 minutes to prepare the mixture.

[0026] Example 5

[0027] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 12 parts of N,N-diallylacrylamide, 18 parts of sodium castor oil sulfonate, 3 parts of polybutylene adipate, 4 parts of fatty alcohol polyoxypropylene ether, 4 parts of paraffin oil, 4 parts of pectin, 4 parts of attapulgite, and 39 parts of water.

[0028] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polybutylene adipate, fatty alcohol polyoxypropylene ether, paraffin oil, pectin, attapulgite and water, and stirring at 1100 rpm for 16 minutes to prepare the mixture.

[0029] Example 6

[0030] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 18 parts of N,N-diallylacrylamide, 13 parts of sodium castor oil sulfonate, 4 parts of polytetrahydrofuran glycerol, 6 parts of fatty alcohol polyoxypropylene ether, 5 parts of microcrystalline wax, 4 parts of agar, 6 parts of diatomaceous earth and 45 parts of water.

[0031] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polytetrahydrofuran glycerol, fatty alcohol polyoxypropylene ether, microcrystalline wax, agar, diatomaceous earth and water, and stirring at 7000 rpm for 26 minutes.

[0032] Example 7

[0033] An environmentally friendly lubrication inhibitor for drilling fluid comprises the following components in parts by weight: 12 parts of N,N-diallylacrylamide, 22 parts of sodium castor oil sulfonate, 3 parts of polybutylene adipate, 4 parts of fatty alcohol polyoxypropylene ether, 4 parts of paraffin oil, 3 parts of pectin, 5 parts of attapulgite and 32 parts of water.

[0034] The method for preparing the environmentally friendly lubrication inhibitor for drilling fluid comprises mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polybutylene adipate, fatty alcohol polyoxypropylene ether, paraffin oil, pectin, attapulgite and water, and stirring at 1100 rpm for 16 minutes to prepare the mixture.

[0035] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An environmentally friendly lubrication inhibitor for drilling fluid, characterized in that: The invention comprises the following components in parts by weight: 10-30 parts of N,N-diallylacrylamide, 10-30 parts of sodium castor oil sulfonate, 3-8 parts of polymer alcohol, 3-6 parts of polyether, 3-5 parts of mineral oil, 3-5 parts of emulsifier, 4-8 parts of filler and 30-50 parts of water.

2. The environmentally friendly lubrication inhibitor for drilling fluid according to claim 1, characterized in that: The polymer alcohol is one or more of polyethylene glycol, polypropylene glycol, polybutylene adipate, and polytetrahydrofuran glycerol.

3. The environmentally friendly lubrication inhibitor for drilling fluid according to claim 1, characterized in that: The polyether is one or more of polyethylene oxide, polypropylene oxide, polytetrahydrofuran, and fatty alcohol polyoxypropylene ether.

4. The environmentally friendly lubrication inhibitor for drilling fluid according to claim 1, characterized in that: The mineral oil is one or more of paraffin oil, white oil and microcrystalline wax.

5. The environmentally friendly lubrication inhibitor for drilling fluid according to claim 1, characterized in that: The emulsifier is one or more of sodium lauryl sulfate, sodium stearate, gum arabic, agar, pectin and carrageenan.

6. The environmentally friendly lubrication inhibitor for drilling fluid according to claim 1, characterized in that: The filler is one or more of attapulgite, diatomite and dolomite powder.

7. The method for preparing the environmentally friendly lubricity inhibitor for drilling fluid according to claim 1, characterized in that: The invention prepares a preparation method by mixing N,N-diallylacrylamide, sodium castor oil sulfonate, polyol, polyether, mineral oil, emulsifier, filler and water, and stirring the mixture at 500-1200 rpm for 10-30 minutes.