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Fluid loss reducer for soilless high-density saturated brine drilling fluid and preparation method thereof

A saltwater drilling fluid and fluid loss reducing agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polluted oil and gas reservoirs, submicron viscosity out of control, and complex viscosity increase in downholes, etc. Toxicity, avoid complex effects downhole

Active Publication Date: 2020-12-15
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide a kind of high-density saturated brine drilling fluid used when drilling in salt-gypsum layer, gypsum layer and high-pressure brine layer, which is easy to cause viscosity out of control, plugging and polluting oil and gas reservoirs, and the used dehydrator. Fluid loss additives are poor high-temperature stability, too large or too small a viscosity-increasing range, which can easily cause downhole complexities and other defects.

Method used

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  • Fluid loss reducer for soilless high-density saturated brine drilling fluid and preparation method thereof
  • Fluid loss reducer for soilless high-density saturated brine drilling fluid and preparation method thereof
  • Fluid loss reducer for soilless high-density saturated brine drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Fluid loss control agent for high-density saturated brine drilling fluid without soil phase I:

[0038] Weigh 100 parts by weight of water and 25 parts by weight of cornstarch, add them to the reactor, stir to dissolve them, add 3.75 parts by weight of sodium hydroxide, and raise the temperature to 60 ° C, keep it warm for 1 hour; add 5 parts by weight to the reactor 2-methyl-2-acrylamidopropanesulfonic acid and 5 parts by weight of N-vinylpyrrolidone, after nitrogen gas for 30 minutes, add 0.5 parts by weight of ammonium persulfate-sodium bisulfite (molar ratio 1:1.2), keep warm 3h, obtain the mixed solution containing polymer A;

[0039] Weigh 50 parts by weight of water, 50 parts by weight of tetrahydrofuran, 10 parts by weight of N,N-diethylacrylamide, 5 parts by weight of 3-acetyl-N-vinylpyrrolidone, stir and dissolve and add 10 parts by weight of 3-acrylamide Propyl tris(trimethylsiloxy)silane, after 30 minutes of blowing nitrogen into the reaction kettle, continue...

Embodiment 2

[0042] Fluid loss control agent for high-density saturated brine drilling fluid without soil phase II:

[0043] Weigh 100 parts by weight of water and 20 parts by weight of wheat starch, add them into the reaction kettle, stir to dissolve them, add 3 parts by weight of sodium hydroxide, and raise the temperature to 55 ° C, keep it warm for 1 hour; add 10 parts by weight to the reaction kettle Part of 2-methyl-2 acrylamidopropanesulfonic acid and 5 parts by weight of itaconic acid, after passing nitrogen in the reactor for 30 minutes, continue to add 0.4 parts by weight of potassium persulfate-sodium bisulfite (molar ratio 1:1.2 ), insulation 4h, obtain the mixed solution that contains polymer A;

[0044] Weigh 50 parts by weight of water, 50 parts by weight of tetrahydrofuran, 15 parts by weight of acrylamide, 5 parts of N-vinylpyrrolidone, stir and dissolve and add 5 parts of N-(3-triethoxysiloxane) propyl propylene Amide, after nitrogen gas was blown into the reaction kettl...

Embodiment 3

[0047] Fluid loss control agent product III for soil-free high-density saturated brine drilling fluid:

[0048] Weigh 100 parts by weight of water and 30 parts by weight of cornstarch, add them to the reactor, stir to dissolve them, add 4.5 parts by weight of sodium hydroxide, and raise the temperature to 55 ° C, keep it warm for 1 hour; add 5 parts by weight to the reactor Part of N-vinylpyrrolidone, after passing nitrogen in the reactor for 30 minutes, continue to add 0.3 weight ammonium persulfate-sodium sulfite (molar ratio 1:1.2), keep warm for 4h, and obtain a mixed solution containing polymer A;

[0049] Weigh 50 parts by weight of water, 50 parts by weight of tetrahydrofuran, 15 parts by weight of N,N-dimethylacrylamide, 10 parts by weight of 3-acetyl-N-vinylpyrrolidone, stir and dissolve and add 5 parts by weight of methacryloxy Propyl tris(trimethylsiloxane) silane, after blowing nitrogen into the reaction kettle for 30 minutes, continue to add 0.5 parts by weight of...

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Abstract

The invention discloses a filtrate reducer for a soil-free high-density saturated brine drilling fluid. The filtrate reducer is a mixture formed by a polymer A and a polymer B and with an interpenetrating copolymer network, wherein the polymer A is composed of starch and an ethylenic monomer by polymerization, and the polymer B is formed by an ethylenic monomer and a silicone monomer containing double bonds by polymerization. In addition, the preparation method is simple, the preparation method is simple, a mixed solution with the polymer A and a mixed solution with the polymer B obtained by prepolymerization are mixed and stirred to form the interpenetrating copolymer network, and then the solution is subjected to ethanol precipitation, washing, drying and pulverizing to obtain the reducer. The filtrate reducer is moderate, the filtrate loss reduction effect is remarkable, the temperature and salt resistance is good, and the solid phase has a good suspension effect.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas fields, in particular to a fluid loss control agent for soil-free high-density saturated brine drilling fluid and a preparation method thereof. Background technique [0002] PetroChina Bohai Drilling Engineering Co., Ltd. currently serves the Tarim Oilfield in Xinjiang, as well as the oilfields in southern Iran and Iraq. There are huge thick gypsum layers, salt gypsum layers and high-pressure brine layers in the deep formations. When drilling in this formation, the drilling fluid faces salt and gypsum contamination, borehole shrinkage and stuck pipe, difficult control of rheological properties and filtration properties, and downhole complexity caused by drilling fluid performance damage. High-density saturated brine drilling fluid is widely used in the drilling of this layer due to its strong resistance to gypsum and salt pollution, good rheological properties and high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 田惠郝惠军刘德庆喻化民黄峰付跃华黄健
Owner CNPC BOHAI DRILLING ENG
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