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Tackifier for drilling fluid, and preparation method and application thereof

A technology of viscosifier and drilling fluid, which is applied in the field of viscosifier for drilling fluid and its preparation. It can solve the problems of increasing viscosity of viscosifier, drilling fluid viscosity, low shear force, and poor performance, so as to increase molecular weight and viscosity, Good anti-saturation salt performance, and the effect of reducing the cost of use

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high molecular polymer in the solid-free drilling fluid is easy to degrade under high temperature conditions, the viscosity and shear force of the drilling fluid are low, and it is difficult to carry suspended cuttings, which will lead to adverse consequences such as pipe sticking
In brine drilling fluid and organic salt drilling fluid, due to the shielding effect of salt on polymer molecules, the viscosity and shear force of the drilling fluid decrease rapidly, and it is also unable to carry and suspend cuttings, which may cause downhole complex
In construction, the maintenance dosage of viscosifier is often increased or the maintenance cycle is shortened to ensure the viscous shear performance of drilling fluid, which not only increases the cost but also may affect other properties of drilling fluid
[0004] In recent years, in China, bio-adhesive tackifiers have been favored by researchers for their excellent cutting performance, but their use in drilling fluids has been limited due to factors such as high prices and poor temperature resistance. widely used
In addition to this, there are cellulose-based viscosifiers and synthetic polymer-based viscosifiers. Although cellulose-based viscosifiers are low in cost, their performance is also poor, and they are rarely used in high-temperature wells. Types of tackifiers include acrylate polymer 80A51 and vinyl monomer multi-polymer copolymer PAC141. These two tackifiers have slightly improved tackifying efficiency and better temperature resistance than bio-adhesive tackifiers and cellulose-based tackifiers. The tackifier is high, but it still cannot meet the performance requirements when applied at high temperature (>130°C) and high salt content

Method used

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  • Tackifier for drilling fluid, and preparation method and application thereof
  • Tackifier for drilling fluid, and preparation method and application thereof
  • Tackifier for drilling fluid, and preparation method and application thereof

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preparation example Construction

[0036] Such as figure 1 As shown, the preparation method of the drilling fluid viscosifier in the embodiment of the present invention comprises the following steps:

[0037] S01: dissolving the four kinds of ethylenic monomers to obtain a mixed solution;

[0038] S02: adjust the pH value of the mixed solution at 8-9;

[0039] S03: Then add solubilizer, crosslinking agent and foaming agent, and stir until completely dissolved;

[0040] S04: Pass in an inert gas to remove oxygen, add an oxidizing initiator and a reducing initiator as a redox initiating system to initiate a polymerization reaction, and generate a rubber block with a large number of bubbles in it, and the polymerization is completed;

[0041] S05: Granulating the rubber block, drying, and pulverizing to obtain a white polymer powder.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation manner...

Embodiment 1

[0044] Pour 300mL of deionized water into a 1L beaker, and then take 2-acrylamido-2-methylpropanesulfonic acid, vinylpyrrolidone, acrylic acid, and acrylamide in a mass ratio of 30:20:40:10 Add a total of 300g of the four monomers into the beaker and dissolve completely; then use 30% sodium hydroxide solution to adjust the pH value of the monomer mixed solution to 8-9, and then add additives: solubilizer ethylene glycol 2%, cross-linking Agent N-methylolacrylamide 1%, foaming agent sodium dodecylbenzene sulfonate 1%, stir well until it is completely dissolved, and after deoxygenation by passing nitrogen for 30 minutes at room temperature, add 0.1g of oxidized initiator Agent ammonium persulfate and 0.1g reducing initiator sodium bisulfite are used as a redox initiator system to initiate a polymerization reaction, and a rubber block with a large amount of air bubbles is generated, that is, the polymerization is completed; the resulting polymer rubber block is cut into small piec...

Embodiment 2

[0059] Take 300mL of deionized water and pour it into a 1L beaker, and then take four kinds of vinylpyrrolidone, maleic acid, fumaric acid and methacrylamide according to the mass ratio of 35:15:40:10 Add a total of 300g of monomers into the beaker and dissolve completely; then use 30% potassium hydroxide solution to adjust the pH value of the monomer mixed solution to 8-9, and then add additives: solubilizer sodium dodecylbenzenesulfonate 5% , cross-linking agent diacetone acrylamide 1%, foaming agent sodium bicarbonate 2%, stir well until it is completely dissolved, and after passing nitrogen for 30 minutes at room temperature, add 0.15g oxidized initiator potassium persulfate and 0.15g The reduction initiator ferric sulfite is used as a redox initiator system to initiate the polymerization reaction, and a rubber block with a large number of bubbles is generated, that is, the polymerization is completed; the obtained polymer rubber block is cut into small pieces by a cutting ...

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Abstract

The invention provides a tackifier for a drilling fluid, and a preparation method and application thereof. The tackifier is a quadripolymer formed by polymerization of four alkene monomers, wherein the four alkene monomers are selected from a temperature-resistant salt-tolerant monomer, a hydrated monomer and an adsorptive monomer; the temperature-resistant salt-tolerant monomer is selected from an alkenyl sulfonic acid monomer; the hydrated monomer is selected from alkenyl carboxylic acid, alkenyl alkane ketone and double-bond-containing quaternary ammonium salt compounds; and the adsorptive monomer is selected from an alkenyl amide monomer. The tackifier provided by the invention can resist a high temperature of no less than 180 DEG C, is resistant to saturated salt, has remarkable tackifying effect, is low in toxicity and environmentally friendly, and can obviously improve the dehydration and wall building capability of the drilling fluid, thereby effectively reducing the dehydration. The invention solves the downhole complexity possibly caused by the fact that the drilling fluid system can not carry and suspend rock debris and thus can not clear boreholes in time due to reduced viscosity shearing force as a result of poor temperature resistance and salt tolerance of the tackifier in deep well, ultradeep well, horizontal well and extended reach well operations.

Description

technical field [0001] The invention belongs to the field of drilling fluid treatment additives, and in particular relates to a drilling fluid viscosity enhancer and a preparation method and application thereof. Background technique [0002] With the gradual development of my country's drilling business, the pace of moving towards deep wells on land and oceans is gradually accelerating. The following deep wells, ultra-deep wells, directional wells, high-inclination extended-reach wells, horizontal wells, slim-hole wells and high-density long wells There will be more and more wells with special conditions such as open-hole wells, and the requirements for oil layer protection will become more stringent. The difficulty of drilling will continue to increase. more prominent. [0003] At present, with the development of petroleum exploration and development technology, the protection of oil and gas reservoirs has been paid more and more attention. Drilling fluid is the first fluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/58C08F226/10C08F220/56C08F222/02C08F212/14C08F220/54C08F212/36C08F220/18C08F226/02C08F2/44C08J9/04C08J9/08C09K8/035
CPCC09K8/035C08F2/44C08F220/06C08F220/58C08F222/02C08J9/04C08J9/08C08J2203/02C08J2333/02C08J2335/00C08F220/585C08F226/10C08F220/56C08F220/54C08F212/36C08F212/14C08F220/1804C08F226/02
Inventor 刘建军马学勤朱红卫王彪马永乐张勇刘晓栋
Owner BC P INC CHINA NAT PETROLEUM CORP
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