Organic salt drilling fluid applicable to extended-reach wells

An extended-reach well, organic salt technology, applied in the field of organic salt drilling fluid, can solve the problems of poor rheology, poor sealing performance of organic salt drilling fluid, poor lubricity, etc., to reduce drill pipe friction and inhibit mud shale The effect of hydration, strong lubricating properties

Active Publication Date: 2016-07-13
BC P INC CHINA NAT PETROLEUM CORP +1
6 Cites 14 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of organic salt drilling fluid suitable for extended-reach wells, which overcomes the deficiencies in th...
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Abstract

The invention discloses an organic salt drilling fluid applicable to extended-reach wells.The organic salt drilling fluid comprises 1-4% of bentonite, 0.3-0.5% of sodium carbonate, 0.5-1% of sodium hydroxide, 0.3-1% of xanthan gum, 2-8% of filtrate reducer, 2-5% of nanometer plugging agent, 1-4% of plugging agent, 0.5-4% of lubricant, 40-60% of organic salt and 25-250% of inert weighting agent, wherein the nanometer plugging agent is formed by copolymerization of MAPOSS, N-isopropylacrylamide and acrylamide, the plugging agent is formed by copolymerization of N-isopropylacrylamide, acrylamide and N,N'-methylene diacrylamide, and the lubricant is formed by compounding of castor oil polyoxyethylene ether, polyethylene glycol and polyvinyl pyrrolidone.The organic salt drilling fluid applicable to the extended-reach wells has the advantages of excellent plugging performance, good lubricating property and rheological property and powerful rock debris carrying capability, thereby being particularly applicable to exploitation of the extended-reach wells.

Application Domain

Drilling composition

Technology Topic

Drilling fluidCastor oil +14

Image

  • Organic salt drilling fluid applicable to extended-reach wells

Examples

  • Experimental program(3)

Example Embodiment

[0044] Example 1
[0045] The invention provides a strong blocking and high temperature resistant organic salt drilling fluid, which includes 1% bentonite, 0.3% sodium carbonate, 0.5% sodium hydroxide, 0.3% xanthan gum, 2% fluid loss agent, 2% nano plugging agent, 1% sulfonated asphalt, 0.5% lubricant, 40% sodium formate and 100% barite powder.
[0046] The preparation method of the fluid loss control agent is as follows:
[0047] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring to dissolve, add an appropriate amount of NaOH to adjust the pH of the aqueous solution to 9, and then add After 15 parts of N-isopropylacrylamide is completely dissolved, under the protection of nitrogen, slowly add 0.05 parts of ammonium persulfate and 0.05 parts of potassium persulfate, heat and react at 60°C for 6 hours to obtain a glue solution, and then dry , Pulverize to obtain the fluid loss control agent.
[0048] The preparation method of the nano plugging agent is as follows:
[0049] Add 1 part of methyl methacrylate-based cage oligomeric silsesquioxane, 5 parts of N-isopropylacrylamide, 14 parts of acrylamide, and 80 parts of deionized water into a four-neck bottle equipped with a mechanical stirrer , Stir uniformly at 60°C; under the protection of nitrogen, slowly add 0.05 parts of azobisisobutylamidine dihydrochloride, heat and react at 60°C for 4 hours to obtain a glue solution, and then dry and pulverize to obtain a nano plugging agent.
[0050] The preparation method of the plugging agent is as follows:
[0051] Add 10 parts of N-isopropyl acrylamide, 17 parts of acrylamide, 3 parts of N,N-methylene bisacrylamide, 70 parts of deionized water to a four-necked flask equipped with a mechanical stirrer, and stir well at 60°C. Under the protection of nitrogen, slowly add 0.05 parts of azobisisobutylamidine dihydrochloride, heated at 60°C for 4 hours to obtain a glue solution, and then dried and crushed to obtain the plugging agent.
[0052] The preparation method of the lubricant is as follows:
[0053] 1) Add 50 parts of polyethylene glycol PEG6000 and 30 parts of polyvinylpyrrolidone K-30 into the double spiral cone mixer, and stir for 2 hours at room temperature;
[0054] 2) Add 5 parts of castor oil polyoxyethylene ether EL-40 and stir for 2h at room temperature to obtain lubricant.

Example Embodiment

[0055] Example 2
[0056] The invention provides a strong plugging and high temperature resistant organic salt drilling fluid, which includes 4% bentonite, 0.5% sodium carbonate, 1% sodium hydroxide, 1% xanthan gum, 8% fluid loss agent, 5% nano plugging agent, 2% sulfonated asphalt, 1% oxidized asphalt, 1% natural asphalt, 40% sodium formate, 20% potassium formate and 200% barite powder.
[0057] The preparation method of the fluid loss control agent is as follows:
[0058] Add 10 parts of acrylamide, 15 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring to dissolve, add appropriate amount of NaOH to adjust the pH of the aqueous solution to 11, and then add After 35 parts of N-isopropylacrylamide is completely dissolved, under the protection of nitrogen, slowly add 0.5 parts of azobisisobutyronitrile and 0.5 parts of azobisisoheptonitrile, and heat and react at 80°C for 4 hours to obtain The glue solution is then dried and crushed to obtain the fluid loss control agent.
[0059] The preparation method of the nano plugging agent is as follows:
[0060] Add 5 parts of methyl methacrylate-based cage oligomeric silsesquioxane, 15 parts of N-isopropylacrylamide, 15 parts of acrylamide, and 65 parts of deionized water into a four-neck bottle equipped with a mechanical stirrer. , Stir uniformly at 60°C; under the protection of nitrogen, slowly add 0.1 part of azobisisobutylamidine dihydrochloride, heat and react at 60°C for 6 hours to obtain a glue solution, and then dry and pulverize to obtain a nano plugging agent.
[0061] The preparation method of the plugging agent is as follows:
[0062] Add 15 parts of N-isopropylacrylamide, 15 parts of acrylamide, 3 parts of N,N-methylenebisacrylamide, 67 parts of deionized water to a four-necked flask equipped with a mechanical stirrer, and stir well at 60°C. Under the protection of nitrogen, slowly add 0.1 part of azobisisobutylamidine dihydrochloride, heated at 60°C for 6 hours to obtain a glue solution, and then dried and crushed to obtain the plugging agent.
[0063] The preparation method of the lubricant is as follows:
[0064] 1) Add 20 parts of polyethylene glycol PEG4000, 20 parts of polyethylene glycol PEG6000, 20 parts of polyvinylpyrrolidone K-60, and 20 parts of polyvinylpyrrolidone K15 into the double-spiral conical mixer, and stir at room temperature for 1 hour;
[0065] 2) Add 4 parts of castor oil polyoxyethylene ether EL-60 and 3 parts of castor oil polyoxyethylene ether EL-30, and stir at room temperature for 2 hours to obtain a lubricant.

Example Embodiment

[0066] Example 3
[0067] The invention provides a strong blocking and high temperature resistant organic salt drilling fluid, which comprises water and 3% bentonite, 0.3% sodium carbonate, 0.8% sodium hydroxide, 0.5% xanthan gum, and 3% bentonite based on the volume of water. 5% fluid loss agent, 4% nano plugging agent, 1% emulsified asphalt, 1% oxidized asphalt, 1% natural asphalt, 40% sodium formate, 20% cesium formate and 150% ilmenite powder .
[0068] The preparation method of the fluid loss control agent is as follows:
[0069] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone, 5 parts of 2-acrylamide-2 methylpropanesulfonic acid and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring and dissolving, Add appropriate amount of NaOH to adjust the pH value of the aqueous solution to 10, and then add 30 parts of N-isopropylacrylamide, after completely dissolved, under the protection of nitrogen, slowly add 0.05 parts of ammonium persulfate and 0.5 parts of azobisiso The butyl amidine dihydrochloride is heated at 70°C for 7 hours to obtain a gum solution, then dried and crushed to obtain the fluid loss reducer.
[0070] The preparation method of the nano plugging agent is as follows:
[0071] Add 7 parts of methyl methacrylate-based cage oligomeric silsesquioxane, 13 parts of N-isopropylacrylamide, 20 parts of acrylamide, and 60 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. , Stir uniformly at 50°C; under the protection of nitrogen, slowly add 1 part of potassium persulfate, heat and react at 50°C for 4 hours to obtain a glue solution, and then dry and pulverize to obtain a nano plugging agent.
[0072] The preparation method of the plugging agent is as follows:
[0073] Add 25 parts of N-isopropyl acrylamide, 9 parts of acrylamide, 2 parts of N,N-methylene bisacrylamide, 64 parts of deionized water to a four-necked flask equipped with a mechanical stirrer, and stir well at 50°C. Under the protection of nitrogen, slowly add 0.3 parts of potassium persulfate, heat at 50°C for 4 hours to obtain a glue solution, and then dry and crush to obtain the plugging agent.
[0074] The preparation method of the lubricant is as follows:
[0075] 1) Add 70 parts of polyethylene glycol PEG10000 and 20 parts of polyvinylpyrrolidone K-15 into a double spiral conical mixer, and stir for 2 hours at room temperature;
[0076] 2) Add 10 parts of castor oil polyoxyethylene ether EL-30, stir at room temperature for 1 hour, and obtain lubricant
[0077] Table 1 is the performance evaluation result of the organic salt drilling fluid of the present invention. The rheological properties, fluid loss reduction performance and lubrication coefficient reduction rate of the drilling fluid of the present invention under high temperature were tested.
[0078] Table 1 Organic salt drilling fluid performance
[0079]
[0080] Note: The rheological properties are measured at 50°C, and the density of the conventional organic salt system is the same as in Example 2 of the present invention.
[0081] It can be seen from Table 1 that the drilling fluid of the present invention has excellent performance, and the conventional organic salt system, the organic salt drilling fluid of the present invention still has a high dynamic shear force even when the surface viscosity is low, indicating that the rheological properties, carry Strong rock ability, the drilling fluid of the invention has good fluid loss reduction performance and strong lubrication performance.
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