Drilling fluid as well as preparation method and application thereof

A drilling fluid and inhibitor technology, applied in the field of drilling fluid, can solve the problems that the stability of the ester group is easily affected by high temperature, cannot meet the drilling requirements of ultra-high temperature wells, and the cost is high

Active Publication Date: 2021-12-31
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The fluid loss control performance of drilling fluids mainly depends on organosilicon fluid loss additives. The prior art (Luo Xiao et al., Research on Preparation and Performance of Temperature and Salt Tolerance Organosilicon Fluid Loss Agents, New Chemical Materials, Issue 8, 2017: 122 -124) Using γ-(methacryloyloxy)propyltrimethoxysilane as a modifier, a silicone copolymer fluid loss control agent (PKANS) containing an ester group was synthesized, but the stability of the ester group is susceptible to high temperature The impact, does not have high temperature resistance
Prior art (Chu Qi, Synthesis and Action Mechanism Research of Anti-high Temperature Silicone Fluid Loss Agent, Fine Petrochemical Industry, 2012, 29(3): 35-39) and the Chinese patent with publication number CN102174314A all use γ-( Acrylamido) propyl triethoxysilane is used as a modifier to synthesize a silicone fluid loss control agent, which can withstand high temperatures of 200°C; however, γ-(acrylamide) propyl triethoxysilane is more The cost of the combination is high
In addition, the patent with the publication number CN102010695A discloses a method for preparing an organosilicon polysulfonate drilling fluid system. The system has strong inhibition, low friction and low damage performance, and can meet the technical requirements of horizontal well drilling. ℃, unable to meet the drilling requirements of ultra-high temperature wells

Method used

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  • Drilling fluid as well as preparation method and application thereof
  • Drilling fluid as well as preparation method and application thereof
  • Drilling fluid as well as preparation method and application thereof

Examples

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preparation example Construction

[0051] In the present invention, the preparation method of the organosilicon fluid loss control agent preferably comprises the following steps:

[0052] dissolving acrylamide, diallyldimethylammonium chloride and sodium styrene sulfonate to obtain a monomer solution;

[0053] The monomer solution, vinyltrimethoxysilane and benzoyl peroxide are mixed for free radical polymerization to obtain the organosilicon fluid loss control agent.

[0054] The invention dissolves acrylamide, diallyl dimethyl ammonium chloride and sodium styrene sulfonate to obtain a monomer solution. In the present invention, the dissolved reagent preferably includes a solvent, and the solvent preferably includes water. In the present invention, the dissolving of acrylamide, diallyldimethylammonium chloride and sodium styrene sulfonate is preferably carried out under the conditions of a protective atmosphere and stirring, and the protective atmosphere preferably includes nitrogen. After the acrylamide, di...

Embodiment 1

[0084] The anti-high temperature tackifier is a pentapolymer of 2-methyl-2-acrylamidopropanesulfonic acid, N-vinylpyrrolidone, acrylamide, acrylic acid and N,N-dimethylacrylamide, with a relative molecular mass of 1.3×10 6 . The synthesis steps are: weigh 10g 2-methyl-2-acrylamidopropanesulfonic acid, 15g N-vinylpyrrolidone, 10g acrylamide, 10g acrylic acid, 15g N,N-dimethylacrylamide and dissolve them in deionized water , add 0.2g of sodium persulfate as an initiator under the condition of flowing nitrogen for 30 minutes, and carry out a copolymerization reaction at a water bath temperature of 60° C. for 5 hours; filter the copolymerization reaction feed liquid, wash the obtained solid with absolute ethanol, and then vacuum-dry to obtain 2- Pentapolymer of methyl-2-acrylamidopropanesulfonic acid, N-vinylpyrrolidone, acrylamide, acrylic acid and N,N-dimethylacrylamide.

[0085] The preparation method of organosilicon inhibitor comprises the steps: in the three-necked round-b...

Embodiment 2

[0091] The preparation method of the anti-high temperature tackifier and the silicone inhibitor is the same as in Example 1.

[0092] The preparation method of organosilicon fluid loss reducer comprises the following steps:

[0093] Weigh 20g of acrylamide, 10g of diallyldimethylammonium chloride and 10g of sodium styrene sulfonate and dissolve in 250g of deionized water, adjust its pH to 8 with NaOH, and add three outlets with a reflux spherical condenser and a stirrer In the round-bottomed flask, raise the temperature to 60°C, and pass nitrogen gas for 30 minutes; add 1.5 g of vinyltrimethoxysilane dropwise at a rate of 0.3 g / min, then add 0.2 g of benzoyl peroxide, and keep the temperature Under the conditions of changing, stirring and filling with nitrogen, react for 12 hours; filter the reaction material liquid completely, put the obtained solid in a vacuum drying oven and dry to obtain a light yellow solid, that is, the organic silicon fluid loss additive.

[0094] Dril...

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Abstract

The invention belongs to the technical field of drilling fluid, and provides drilling fluid as well as a preparation method and application thereof. The drilling fluid provided by the invention is an aqueous solution comprising the following components in percentage by mass: 4.0 to 6.0% of an organic silicon filtrate reducer, and 1.0 to 1.5% of an organic silicon inhibitor; the organic silicon filtrate reducer comprises the following preparation raw materials in parts by weight: 10 to 20 parts of acrylamide, 10 to 20 parts of diallyldimethylammonium chloride, 10 to 20 parts of sodium p-styrenesulfonate, 1 to 1.5 parts of vinyl trimethoxy silane and 0.1 to 0.2 part of benzoyl peroxide. The organic silicon inhibitor comprises the following preparation raw materials in parts by weight: 10 to 15 parts of vinyltriethoxysilane and 100 to 150 parts of hyperbranched polyethyleneimine. Due to the use of the organic silicon filtrate reducer and the organic silicon inhibitor, the obtained drilling fluid has excellent filtrate reduction property and inhibition property at high temperature, and can be applied to an easily unstable shale high-temperature stratum.

Description

technical field [0001] The invention relates to the technical field of drilling fluid, in particular to a drilling fluid and its preparation method and application. Background technique [0002] With the development of oil and gas resources in high-temperature deep wells and complex wells, new challenges are posed to drilling fluids in drilling operations. Especially in unstable shale formations, there are higher requirements on the filtration loss and suppression performance of drilling fluid. [0003] In the prior art, the inhibitory performance of drilling fluid mainly depends on organosilicon inhibitors. The publication number is CN111117580A patent reports linear polyether amines and isocyanate-based and acryl-based silane coupling agents to prepare aminosilanol inhibitors. Linear poly Ether amine contains multiple ether groups, which makes it easy to decompose and fail at high temperature. [0004] The fluid loss control performance of drilling fluids mainly depends ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C08F226/10C08F220/58C08F220/56C08F220/06C08F220/54C08F283/00C08F230/08C08F226/02C08F212/14
CPCC09K8/24C08F226/10C08F220/54C08F283/00C08F226/02C08F220/585C08F220/56C08F220/06C08F230/085C08F212/30
Inventor 由福昌许明标高阳周书胜
Owner JINGZHOU JIAHUA TECH
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