CN112552885B - Superhigh temperature resistant 180 ℃ tackifying type well completion fluid and workover fluid - Google Patents
Superhigh temperature resistant 180 ℃ tackifying type well completion fluid and workover fluid Download PDFInfo
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- CN112552885B CN112552885B CN202011512785.2A CN202011512785A CN112552885B CN 112552885 B CN112552885 B CN 112552885B CN 202011512785 A CN202011512785 A CN 202011512785A CN 112552885 B CN112552885 B CN 112552885B
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- C09K8/02—Well-drilling compositions
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Abstract
The invention relates to a 180 ℃ ultrahigh temperature resistant tackifying type well completion fluid and workover fluid, and belongs to the field of oil and natural gas exploitation. The raw materials comprise 1wt% of stabilizing agent, 1.1wt% of water-absorbing colloidal particles and the balance of water. After aging for 24 hours at 180 ℃, the viscosity range of the workover fluid is 87-650 mPa.s, and the viscosity can be kept stable at 180 ℃. The preparation method can meet the well repair requirement of the high-temperature oil and gas well, is simple and convenient to prepare, has strong field operability, and has good application prospect.
Description
Technical Field
The invention relates to a 180 ℃ ultrahigh temperature resistant tackifying type well completion fluid and workover fluid, and belongs to the field of oil and natural gas exploitation.
Background
The development of deep and ultra-deep layer oil and gas reservoirs is the main force of future oil and gas production. Deep high temperature environments present a severe challenge to downhole working fluids. Carboxymethylcellulose (CMC) and xanthan gum are commonly used in workover operations to increase the viscosity of workover fluids. Carboxymethyl cellulose is water-soluble cellulose ether, and the solution of carboxymethyl cellulose is neutral or slightly alkaline, has the characteristics of thickening, bonding and the like, but can be rapidly degraded at high temperature, and the viscosity is greatly reduced. The tackifying effect of the xanthan gum has good effects on improving the foam stability, the anti-shearing stability and the like, but the xanthan gum has limited high temperature resistance, is easy to generate thermooxidative degradation at high temperature, and has large dosage and high production cost. Therefore, aiming at the problem that the traditional tackifying workover fluid has an unsatisfactory tackifying effect at high temperature, the development of a high-temperature-resistant tackifying completion fluid and workover fluid for circulating well flushing and sand carrying is urgently needed.
The stability of the workover fluid is a key factor of safe and efficient workover operation of the ultrahigh-temperature oil and gas well. The formation temperature is too high in the well repairing process, and the traditional tackifying type well repairing liquid is not resistant to high temperature, is easy to leak, and cannot carry sand to be drained back. Therefore, the related properties of the workover fluid, including basic requirements of no degradation, easy circulation, viscosity increasing and the like at ultrahigh temperature, need to be improved. In 2012, xuyandong et al developed a well repairing fluid (chinese patent: CN 102618225A), which includes a prepared base fluid and an additive, wherein the prepared base fluid is formation water or a mixed solution of the formation water and surface water. Wherein the additives comprise a tackifier, a corrosion inhibitor and a stabilizer. The preparation method has the advantages of good preparation properties of various raw materials and stratum, high temperature resistance of 120 ℃ and high mineralization degree, simple field preparation process and capability of meeting the requirement of reservoir protection.
In 2014, sun Lin et al studied the application of temperature-resistant and salt-resistant xanthan gum system in oil field development. The xanthan gum has a special molecular structure, has obvious technical advantages when being used for oil field development, and has the advantages of strong water solubility, tackifying and thickening properties, salt resistance and pollution resistance, good shear stability, unique rheological property and the like; but are susceptible to thermooxidative degradation at high temperatures. Application research progress of temperature-resistant and salt-resistant xanthan gum system in oilfield development [ J ] application chemical industry 2014, 43 (12): 2279-2284 ]
In 2017, chenjiangguang et al developed a viscosity-increasing suspension modifier and application thereof (Chinese patent: CN 109384884A), wherein the viscosity-increasing suspension modifier comprises the following components: hydroxymethyl starch, N, N' -methylene bisacrylamide and thiosulfate. The viscosity-increasing suspension modifier can be well dissolved in high-salinity brine workover fluid, and the viscosity of the brine workover fluid is remarkably increased, so that the suspension capacity of the brine workover fluid is improved, and smooth workover treatment is facilitated.
In 2020, liu et al studied the properties of nanocomposite films composed of carboxymethylcellulose, cellulose nanofibers and silica, wherein carboxymethylcellulose can be used as a thickener, a flotation agent; but are susceptible to rapid degradation at high temperatures. (Jianxin Liu, et al. Nanocomposites membranes from cellulose nanofibers, siO 2 and carboxymethyl cellulose with improved properties.Carbohydrate Polymers[J],2020:11588.)
At present, a solid-free tackifying workover fluid system represented by xanthan gum is completely degraded after being aged for 24 hours at the ultra-high temperature of 180 ℃; CMC is stable for 16h at high temperature of 120 ℃, but is easy to generate thermal oxidation degradation, so that the application of the CMC in the well repair of ultra-high temperature oil and gas wells is limited. Aiming at the problem that the traditional tackifying workover fluid has unsatisfactory tackifying effect at high temperature, an ultrahigh-temperature tackifying completion fluid and an ultrahigh-temperature tackifying workover fluid need to be designed urgently to ensure safe, smooth and efficient underground operation.
Disclosure of Invention
The invention aims to develop a viscosity-increasing completion fluid and workover fluid capable of resisting ultra-high temperature of 180 ℃, which are used for circulating sand carrying of oil and gas wells.
The invention provides a technical scheme that:
the viscosity increasing completion and workover fluid resisting superhigh temperature of 180 deg.c consists of stabilizer and water absorbing colloidal particle as main material and is compounded with clear water. The stabilizer is at least one of urotropine, phenolic resin and polyethyleneimine.
In other embodiments of the present invention, the stabilizer is urotropine, phenolic resin, or polyethyleneimine diluted with clear water in a certain proportion.
In another embodiment of the present invention, the raw material further includes water-absorbing colloidal particles, the water-absorbing colloidal particles include at least one of SAP-KA01 (trade product, gordonite energy technology limited, particle size 0.8-1.5 mm, water absorption rate 67.2) and SHK-220A (trade product, gordonite energy technology limited, particle size 0.6-1.0 mm, water absorption rate 152.17), and the water-absorbing colloidal particles include sulfonate groups.
The tackifying type completion fluid and workover fluid resistant to the ultrahigh temperature of 180 ℃ and the preparation method thereof provided by the embodiment of the invention have the beneficial effects that:
the water-absorbing colloidal particles are partially degraded at high temperature, so that the viscosity of the completion fluid and the workover fluid can be improved; the stabilizer can improve the effect of adhesion and stable adhesion of the completion fluid and workover fluid.
Drawings
FIG. 1 is a graph of the viscosity of a completion fluid and a workover fluid according to example 1 of the present invention as a function of temperature;
FIG. 2 is a graph of the viscosity of the completion and workover fluids of example 2 of the present invention as a function of aging time;
FIG. 3 is a graph of viscosity as a function of micelle concentration for completion and workover fluids according to example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The following specifically describes the ultra-high temperature resistant 180 ℃ tackifying type completion fluid and workover fluid and the preparation method thereof.
A viscosity-increasing type well completion fluid and workover fluid resistant to ultra-high temperature of 180 ℃ mainly comprises a stabilizer and water-absorbing colloidal particles. The stabilizer is at least one of urotropine, phenolic resin and polyethyleneimine.
In other embodiments of the present invention, the stabilizer is urotropine, phenolic resin, polyethyleneimine diluted with clear water in a certain proportion.
In another embodiment of the present invention, the raw material further includes water-absorbing colloidal particles, the water-absorbing colloidal particles are at least one of SAP-KA01 (trade product, guulite energy technology limited, particle size 0.8-1.5 mm, water absorption capacity 67.2) and SHK-220A (trade product, guulite energy technology limited, particle size 0.6-1.0 mm, water absorption capacity 152.17), and the water-absorbing colloidal particles contain sulfonate groups.
In detail, preparing a viscosity increasing type completion fluid and workover fluid resisting ultra-high temperature of 180 ℃, diluting 1% of a stabilizer by using clear water, adding the diluted stabilizer into quantitative clear water, stirring to uniformly mix the stabilizer, then adding a water absorbing material, and stirring to completely absorb water and swell. The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Adding a certain amount of clear water into a 500ml beaker according to the data in the table 1, then diluting 1% of a stabilizer according to the proportion (1. After cooling, the workover fluid was heated by a water bath from 20 ℃ to 90 ℃ and the samples were tested at 600rpm (1022 s) with a six speed rotational viscometer at 10 ℃ intervals -1 )、300rpm(511s -1 )、200rpm(340.7s -1 ) And 100rpm (170.3 s) -1 ) Apparent viscosity of (b). The results are shown in Table 1.
TABLE 1 viscosity vs. temperature relationship
From the data in table 1, it can be seen that at a given shear rate, the workover fluid viscosity gradually decreases with increasing temperature.
Example 2
Adding a certain amount of clear water into a 500ml beaker according to the data in the table 2, then diluting 1% of the stabilizer to 20% (the polyethyleneimine and the phenolic resin are 2. Thereby preparing the tackifying completion fluid and workover fluid with the ultrahigh temperature resistance of 180 ℃. Aging the mixture in a high temperature reactor at 180 ℃ for 1-4 days, and respectively testing the sample at 600rpm (1022 s) by using a six-speed rotational viscometer -1 )、300rpm(511s -1 )、200rpm(340.7s -1 )、100rpm(170.3s -1 ) And 6rpm (10.22 s) -1 ) Apparent viscosity of (b). The experimental results are shown in table 2 below.
TABLE 2 aging time vs. viscosity relationship
From the data in table 2, it can be seen that at a given shear rate, the viscosity of the workover fluid gradually decreases with increasing aging time.
Example 3
Adding a certain amount of clear water into a 500ml beaker according to the data in the table 3, diluting 1% of the stabilizer according to the proportion (phenolic resin, urotropine and polyethyleneimine are 1: 2) to 20% by using the certain amount of clear water, adding the diluted stabilizer into the beaker, stirring for 15-30 min until the stabilizer is completely mixed uniformly, adding 0.7-1.1% of SKH-220A water-absorbing colloidal particles, fully stirring to completely absorb water and swell the water-absorbing colloidal particles, putting the water-absorbing colloidal particles into a high-temperature reactor, sealing the container, putting the container into a constant-temperature drying box at 180 ℃, and standing for 24h. Thus preparing the tackifying completion fluid and workover fluid resisting the ultrahigh temperature of 180 ℃. Aging the mixture at 180 deg.C under the colloidal particle concentration of 0.7% -1.1% for 24h, and respectively testing the sample at 600rpm (1022 s) with six-speed rotary viscometer -1 )、300rpm(511s -1 )、200rpm(340.7s -1 )、100rpm(170.3s -1 )、6rpm(10.22s -1 ) And 3rpm (5.11 s) -1 ) Apparent viscosity of the resulting solution. The experimental results are shown in table 3 below.
TABLE 3 different colloidal particle concentrations vs. viscosity
From the data in table 3, it can be seen that at a given shear rate, the viscosity of the workover fluid gradually increases with increasing micelle concentration.
The embodiments described above are some, not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (3)
1. The tackifying completion fluid and workover fluid resistant to the ultrahigh temperature of 180 ℃ is composed of a stabilizer and water-absorbing colloidal particles, and is prepared by using clear water, and is characterized by comprising the following components in percentage by mass: the stabilizer is composed of 1-2 mass ratio of (1-1).
2. The ultra-high temperature 180 ℃ viscosified completion and workover fluids of claim 1, wherein said stabilizer is diluted with fresh water.
3. The completion fluid and workover fluid resistant to ultra-high temperature 180 ℃ viscosity increase of claim 2, wherein the water-absorbing colloidal particles SHK-220A are easy to form knots when added into the mixed solution, and the colloidal particles cannot absorb water automatically to swell completely, so that the water-absorbing colloidal particles are stirred in time to absorb water and swell completely when added.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415463A (en) * | 1979-06-22 | 1983-11-15 | The Dow Chemical Co. | Preparation of viscosifiers for zinc salt workover and completion brines |
| CN106009498A (en) * | 2016-08-02 | 2016-10-12 | 苏州锐特捷化工制品有限公司 | Magnetic expansion-resistant fiber modified nano building functional material and preparation method thereof |
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| CN100471928C (en) * | 2006-05-18 | 2009-03-25 | 大庆浩拓化工有限公司 | Efficient multifunctional clay anti-expension stabilizer for injecting water and its production |
| CN102134979A (en) * | 2011-03-01 | 2011-07-27 | 中国海洋石油总公司 | New method for forming manual well wall in oil and gas well by water-absorbing resin |
| CN102382244B (en) * | 2011-08-17 | 2013-02-06 | 西南石油大学 | Gelation-delayed in-situ polymerized water shutoff gel for high-temperature reservoirs |
| CN103160259B (en) * | 2013-04-03 | 2015-11-04 | 中国石油大学(华东) | The water-base drilling fluid of anti-255 DEG C of ultrahigh-temperature and construction technology thereof |
| CN104367478A (en) * | 2014-11-18 | 2015-02-25 | 杭州中美华东制药有限公司 | Mixed granulating equipment and application of mixed granulating equipment for preparing solid preparation |
| CN105062437B (en) * | 2015-08-03 | 2017-08-25 | 湖北汉科新技术股份有限公司 | A kind of oil-in-water emulsified drilling fluid of anti-240 DEG C of high temperature |
| CN112552886B9 (en) * | 2020-12-20 | 2023-05-26 | 西南石油大学 | Ultrahigh-temperature-resistant 180 ℃ variable-density solid-free tackifying completion fluid and workover fluid |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415463A (en) * | 1979-06-22 | 1983-11-15 | The Dow Chemical Co. | Preparation of viscosifiers for zinc salt workover and completion brines |
| CN106009498A (en) * | 2016-08-02 | 2016-10-12 | 苏州锐特捷化工制品有限公司 | Magnetic expansion-resistant fiber modified nano building functional material and preparation method thereof |
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