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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 the prior art, and can effectively solve the problems of poor plugging performance, poor lubricity, and poor rheology of existing organic salt drilling fluids. The problem

Method used

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  • Organic salt drilling fluid applicable to extended-reach wells

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Effect test

Embodiment 1

[0045] A strong plugging and high temperature resistant organic salt drilling fluid provided by the present invention comprises 1% bentonite, 0.3% sodium carbonate, 0.5% sodium hydroxide, 0.3% xanthan gum, 2% fluid loss control agent, 2% nano plugging agent, 1% sulfonated bitumen, 0.5% lubricant, 40% sodium formate and 100% barite powder.

[0046] Wherein the preparation method of fluid loss reducer is as follows:

[0047] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked bottle equipped with a mechanical stirrer. After stirring and dissolving, add an appropriate amount of NaOH to adjust the pH value 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 glue, and then dry it , pulverized to obtain the fl...

Embodiment 2

[0056] A strong plugging and high temperature resistant organic salt drilling fluid provided by the present invention comprises 4% bentonite, 0.5% sodium carbonate, 1% sodium hydroxide, 1% xanthan gum, 8% fluid loss control agent, 5% nano plugging agent, 2% sulfonated bitumen, 1% oxidized bitumen, 1% natural bitumen, 40% sodium formate, 20% potassium formate and 200% barite powder.

[0057] The preparation method of described fluid loss reducer is as follows:

[0058] Add 10 parts of acrylamide, 15 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked bottle equipped with a mechanical stirrer. After stirring and dissolving, add an appropriate amount of NaOH to adjust the pH value 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 azobisisoheptanonitrile, and heat at 80°C for 4 hours to obtain The ...

Embodiment 3

[0067] A kind of strong plugging and anti-high temperature organic salt drilling fluid provided by the invention comprises water and 3% bentonite, 0.3% sodium carbonate, 0.8% sodium hydroxide, 0.5% xanthan gum, 5% fluid loss additive, 4% nano plugging agent, 1% emulsified bitumen, 1% oxidized bitumen, 1% natural bitumen, 40% sodium formate, 20% cesium formate and 150% ilmenite powder .

[0068] The preparation method of described fluid loss reducer 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 bottle equipped with a mechanical stirrer, and stir to dissolve, Add an appropriate amount of NaOH to adjust the pH value of the aqueous solution to 10, then add 30 parts of N-isopropylacrylamide, after it is completely dissolved, slowly add 0.05 parts of ammonium persulfate and 0.5 parts of azobisiso Butylamidine dihydrochloride was heated and re...

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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.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to an organic salt drilling fluid suitable for extended-reach wells. Background technique [0002] With the increasing demand for oil resources in the world and the continuous exploitation of proven oil geological reserves, the drilling requirements for extended-reach wells, horizontal wells, multi-branch wells, especially small-hole deep wells are getting higher and higher. However, the construction difficulty of extended-reach wells and horizontal wells and the requirements for drilling fluid systems are far higher than those of vertical wells and directional wells. Drilling fluids suitable for extended-reach wells and horizontal wells must first have good rheology. , because the very low pressure drop cannot provide sufficient power for removing reservoir damage, a cuttings bed is easily formed at the bottom of the well, and it is difficult to remove the cuttings bed only...

Claims

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Application Information

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IPC IPC(8): C09K8/22
CPCC09K8/22C09K2208/10C09K2208/12C09K2208/34
Inventor 张民立李广环黄达全王磊磊张坤龙涛侯士东李振杰王鲁坤
Owner BC P INC CHINA NAT PETROLEUM CORP
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