Ultrahigh-temperature modified polymer well cementation fluid loss agent as well as preparation method and application thereof

A fluid loss reducing agent and polymer technology, which are applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of mild conditions, simple preparation methods, and easy availability of raw materials

Pending Publication Date: 2021-11-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an ultra-high temperature modified polymer cementing fluid loss reducing agent and its preparation method and application to solve complex engineering problems such as deep and ultra-deep wells, complex natural gas wells, unconventional oil and gas wells, and gas storage wells. The fluid loss reducer provided by the present invention has stable performance, strong temperature resistance (30-240°C), resistance to salt saturation, excellent fluid loss reducer performance, strong adaptability and significant improvement The mechanical properties of cement stone (reinforcement and toughening) and other advantages

Method used

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  • Ultrahigh-temperature modified polymer well cementation fluid loss agent as well as preparation method and application thereof
  • Ultrahigh-temperature modified polymer well cementation fluid loss agent as well as preparation method and application thereof
  • Ultrahigh-temperature modified polymer well cementation fluid loss agent as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0042] The reaction process is as Figure 8 shown, including the following steps:

[0043] Weigh 1 g of graphene oxide (GO) into 100 g of water, and ultrasonically disperse at a frequency of 100 Hz for 30 min. After the ultrasonication was completed, 0.3 g of azobisisobutylamidine hydrochloride was added to the above solution, and the pH of the solution was adjusted to 10 with sodium hydroxide, and placed in a rotary stirrer at 30° C. for 4 h. Weigh 40g of 2-acrylamido-2-methylpropanesulfonic acid, 7.5g of N,N-dimethylacrylamide and 2.5g of itaconic acid, add 50g of water to dissolve completely, add 10g of sodium hydroxide to adjust the system When the pH reaches 6, add the solution to the graphene oxide solution after the reaction, raise the temperature to 80°C at a rate of 2°C / min at a speed of 200rpm, and keep this temperature for 2 hours, then cool naturally to room temperature to obtain a black Viscous graphene oxide graft modified polymer fluid loss reducer, that is, u...

Embodiment 2

[0045] Weigh 1 g of graphene oxide (GO) into 100 g of water, and ultrasonically disperse at a frequency of 100 Hz for 1 h. After the ultrasonication was completed, 0.3 g of azobisisobutylamidine hydrochloride was added to the above solution, and the pH of the solution was adjusted to 9 with sodium hydroxide, and placed in a rotary stirrer at 35° C. for 3 h. Weigh 40g of 2-acrylamido-2-methylpropanesulfonic acid, 5g of N,N-dimethylacrylamide and 5g of itaconic acid, add 50g of water to dissolve completely, add 14g of sodium hydroxide to adjust the pH of the system to 6. Add the solution to the graphene oxide solution after the reaction, raise the temperature to 60°C at a rate of 1°C / min at a rotation speed of 250rpm, and keep this temperature for 4 hours, then cool naturally to room temperature to obtain an ultra-high temperature improved Permanent polymer cementing fluid loss reducer (GO-Polymer).

Embodiment 3

[0047] Weigh 0.5 g of graphene oxide (GO) into 100 g of water, and ultrasonically disperse at a frequency of 60 Hz for 10 min. After the ultrasonication was completed, 0.3 g of azobisisobutylamidine hydrochloride was added to the above solution, and the pH of the solution was adjusted to 9 with sodium hydroxide, and placed in a rotary stirrer at 25° C. for 3 h. Weigh 30g of 2-acrylamido-2-methylpropanesulfonic acid, 15g of N-vinylcaprolactam and 5g of maleic acid and add 50g of water to dissolve completely, add 12.5g of sodium hydroxide to adjust the pH of the system to 7, and then Add this solution to the graphene oxide solution after the reaction, raise the temperature to 90°C at a rate of 3°C / min at a rotation speed of 150rpm, and keep this temperature for 1 hour, then cool naturally to room temperature to obtain an ultra-high temperature modified polymer Cementing fluid loss reducer (GO-Polymer).

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Abstract

The invention discloses an ultrahigh-temperature modified polymer well cementation fluid loss agent as well as a preparation method and application thereof, and belongs to the technical field of oil and gas well cementation admixtures. The ultrahigh-temperature modified polymer well cementation fluid loss agent is prepared from the following raw materials in parts by weight: 0.1 to 2 parts of graphene oxide, 0.1 to 1 part of initiator, 12 to 48 parts of 2-acrylamido-2-methylpropanesulfonic acid, 3 to 24 parts of unsaturated amide, 2 to 12 parts of unsaturated carboxylic acid and 130 to 170 parts of water. The fluid loss agent provided by the invention has the advantages of stable performance, high temperature resistance (30-240 DEG C), salt saturation resistance, excellent fluid loss performance, high adaptability, capability of remarkably improving mechanical properties (strengthening and toughening) of set cement and the like, and can meet the requirements of well cementation technologies under complex working conditions of deep wells, ultra-deep wells, complex natural gas wells, unconventional oil and gas wells, gas storage wells and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing admixtures, in particular to an ultra-high temperature modified polymer cementing fluid loss reducing agent and its preparation method and application. Background technique [0002] Deep, ultra-deep, and unconventional oil and gas resources have become the main areas for increasing oil and gas reserves and production. Complex working conditions such as high temperature, ultra-high temperature, and large volume fracturing pose severe challenges to cementing slurry technology, and the difficulty of cementing has increased sharply. Cementing quality cannot be guaranteed. The complex downhole working conditions put forward higher requirements for the cementing slurry system and admixtures. Among them, the fluid loss reducer is one of the main admixtures to improve the comprehensive performance of the cementing slurry. Quality means a lot. [0003] With the rapid development of oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/58C08F220/54C08F222/02C09K8/487
CPCC08F292/00C09K8/487C08F220/585C08F220/54C08F222/02
Inventor 夏修建于永金徐璞靳建洲刘硕琼齐奉忠徐明张华刘慧婷张弛刘子帅沈吉云吕斌周崇奉丁志伟张顺平
Owner BC P INC CHINA NAT PETROLEUM CORP
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