CN110924929A - Solid-free ultrahigh-density well completion testing fluid and preparation method thereof - Google Patents
Solid-free ultrahigh-density well completion testing fluid and preparation method thereof Download PDFInfo
- Publication number
- CN110924929A CN110924929A CN201911189907.6A CN201911189907A CN110924929A CN 110924929 A CN110924929 A CN 110924929A CN 201911189907 A CN201911189907 A CN 201911189907A CN 110924929 A CN110924929 A CN 110924929A
- Authority
- CN
- China
- Prior art keywords
- solid
- preparation
- solution
- high density
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention relates to a solid-free phase-free ultrahigh-density well completion testing solution and a preparation method thereof, belonging to the field of well drilling and completion engineering of oil and gas fields. The raw materials of the composite material comprise 0.02-0.05 wt% of an oxygen scavenger, 28-75 wt% of tungstate, a corrosion inhibitor and a pH regulator. The invention effectively solves the difficult problem of well completion of deep high-temperature high-pressure oil and gas wells, and the density of the testing liquid can reach 2.9g/cm at most3And the performance can be kept stable at high temperature, the corrosion rate of the pipe is 0.0837mm/a at the lowest under the condition of 180 ℃, the requirement of offshore or onshore well completion testing of high-temperature and high-pressure oil and gas wells can be met, and the method is simple and convenient to prepare, strong in field operability and good in application prospect.
Description
Technical Field
The invention relates to a solid-free phase-free ultrahigh-density well completion testing solution and a preparation method thereof, belonging to the field of well drilling and completion engineering of oil and gas fields.
Background
During the exploration and development of oil and gas resources, five means are mainly used for directly obtaining formation fluid characteristics and formation parameters, which are seismic exploration, rock debris logging, coring, electrical measurement and formation testing in sequence, wherein the most direct method for obtaining productivity data and evaluating a reservoir is formation testing. The formation test is to stop drilling if good oil and gas display is found in the drilling process, and test possible oil and gas reservoirs to obtain the data of oil and gas reservoir yield, pressure, fluid production property, permeability, fluid sample and the like. The method comprises the steps of midway testing and well completion testing. In both tests, a test tool is conveyed to a to-be-tested layer position by using a drill rod or an oil pipe and is sealed, underground fluid flow is induced by using a differential pressure effect, a fluid sample is obtained through ground operation, and a series of parameters such as fluid pressure, yield, viscosity, a pressure-time change relation and the like are measured.
The stability of the test solution is a key factor of ultra-high temperature safety test of the oil and gas well, and the quality of the performance of the test solution directly influences the quality of well completion test operation and the safety of construction. With the continuous advance of oil and gas production, the construction conditions of offshore and onshore oil and gas reservoirs are more and more complex, and the downhole operation conditions brought by compact oil and gas reservoirs with anisotropism, anisotropy, low altitude and low permeability are increasingly worsened, wherein the typical representation of the compact oil and gas reservoirs is high temperature and high pressure. In order to continue to achieve good development and production, new requirements in terms of well completion testing fluids are first to be met, including a series of basic requirements of high density, high temperature resistance, low corrosion and low damage to the formation. Jiahu et al (2017) developed a temperature-resistant low-corrosion high-density solid-free test solution (Chinese patent: CN 107642357A) with the main components: 10-70% of phosphate, 0.02-20% of soluble formate, 0.02-0.05% of deoxidant, 0.02-2% of tackifier and 0.02-2% of scale inhibitor, wherein the density of the scale inhibitor can reach 1.82g/cm3Can maintain stable performance at 180 ℃ and at low temperature and high temperatureCompared with the traditional test liquid system, the testing liquid system has the advantage of low corrosion and can meet well killing operation of medium and high pressure coefficients.
In 2008, Ezzat et al introduced a CaCl2/CaBr2Solid-free test solution (EzzaM, equivalent. HighDensity Brine-Based dril-In Fluid Improved Reservoir product In gases Field offset Egypt [ C]//SPE North Africa Technical Conference&Society of Petroleum Engineers,2008, SPE-112950-MS), the density of the test solution was 1.74g/cm3The temperature resistance can be adjusted within the range, the temperature resistance can reach 162 ℃, the pH value is between 8.5 and 9.0, and the temperature resistance type polymer is added to adjust the rheological property of the test liquid and control the filtration loss.
In 2014, Jilin oil field developed a set of high-density low-damage solid-free test solution, and the test solution system uses ZnBr2The salt water is used as base liquid, and additives such as antiseptic and clay stabilizer are added, so that the density can reach 2.5g/cm3And resisting the temperature of 180 ℃. However, the method has the disadvantages that the corrosion rate is still high (1.5mm/a), and if the test operation is carried out for a long time, the method can cause great corrosion to the pipe (Chensheng and the like, and is suitable for the research on the high-temperature, high-density and low-damage solid-free well killing fluid of the gas reservoir [ J]Oil and gas journal, 2014,36(7): 103-.
In 2016, Ofei et al showed that Potassium Formate clean Brine systems resist temperatures as high as 150 ℃ and are suitable for use as wellbore servicing fluids in drilling and completion operations for high Temperature and high pressure oil and gas reservoirs (Ofei T N, et al. formulation Water-Based Muds for high Temperature drilling wells Using Potasstation formation Brine and synthetic polymers: A Design of Experimental application [ C ]// IADC/SPE Asia Pacific drilling technology Conference,2016, SPE-180520-MS). The indoor experiment result shows that the addition of the formate in the shaft working fluid can effectively prevent the flocculation of the tackifier, maintain the rheological property of the shaft working fluid and save the cost and the construction time of the drilling and completion operation.
The current solid-free well completion testing liquid is limited to be used for well completion testing of high-temperature and high-pressure oil and gas wells due to a series of conditions such as density, corrosion and environmental protection. For the ultra-high pressure coefficient stratum, a new high-density low-corrosion solid-free well completion testing liquid system needs to be designed urgently to ensure safe, smooth and effective downhole operation.
Disclosure of Invention
The invention aims to provide a solid-free ultra-high density well completion test solution and a preparation method thereof, which mainly solve the problems of high cost, strong corrosivity and toxicity of conventional cesium salt represented by cesium formate, bromine salt, zinc salt and other inorganic salt solutions, or solve the problem that the density of a phosphate solution cannot break through 2.0g/cm3The limitations of (2).
The invention provides a technical scheme that:
a solid-free ultra-high density well completion test fluid and a preparation method thereof are disclosed, wherein the test fluid mainly comprises silicotungstic acid, an oxygen scavenger, a corrosion inhibitor and a pH regulator. The oxygen scavenger is at least one of thiourea, sodium thiosulfate, sodium sulfite, sodium dithionite and hydrazine.
In other embodiments of the present invention, the oxygen scavenger is thiourea and/or sodium thiosulfate.
In other embodiments of the present invention, the raw material further comprises a corrosion inhibitor, and the corrosion inhibitor is at least one of WH-1 (commercial product, New technology, Inc. of King-Han-Hua-Ke-Tech), CA101 (commercial product, Zhonghai oil and gas field chemical department), TY-2 (commercial product, Natural gas research institute of oil and gas field, southwestern, China).
In other embodiments of the present invention, the raw material further includes a pH adjuster, and the pH adjuster is at least one of sodium hydroxide, sodium carbonate, and sodium bicarbonate.
The invention also provides a technical method:
the preparation method of the solid-free ultrahigh-density well completion testing solution comprises the following steps:
dissolving solid silicotungstic acid by water, uniformly mixing to obtain a mixed solution, and cooling the mixed solution to room temperature. After cooling, adding an oxygen scavenger into the silicotungstic acid solution, then adding a pH regulator, and if an exothermic phenomenon (such as using sodium hydroxide) occurs, adding a corrosion inhibitor after the solution is cooled to room temperature.
The solid-free ultrahigh-density well completion testing solution and the preparation method thereof provided by the embodiment of the invention have the beneficial effects that:
silicotungstic acid (hydrated, molecular formula is SiO)2.12WO3.26H2O) has higher solubility, and the relative molecular weight of the compound is 3310.83, so that the density of the test solution can be effectively improved. The oxygen scavenger can reduce the oxygen content in the test liquid and avoid the corrosion of metal pipes and equipment due to overhigh oxygen content. Because the silicotungstic acid solution is acidic, the pH regulator is added, and the action of the pH regulator is to change the acid solution into a neutral or alkaline salt solution on the premise of not reducing the density of the original silicotungstic acid solution and not influencing other performances of the solution, thereby improving the stability and reducing the corrosivity. The corrosion inhibitor isolates the metal from contact with the test liquid by adsorption of polar groups on the metal surface, thereby reducing the rate of the corrosion reaction.
The test solution provided by the embodiment of the invention is a solid-free ultra-high-density well completion test solution, has a low corrosion advantage (the corrosion rate is as low as 0.0899mm/a at 180 ℃) compared with a traditional test solution system, and has an obvious density advantage (the highest test density can reach 2.9 g/cm)3) And the requirement of well completion construction of deep high-temperature and high-pressure oil and gas wells can be met.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The solid-free ultra-high density completion test fluid and the preparation method thereof according to the embodiment of the present invention will be described in detail below.
A solid-free ultra-high density well completion test fluid and a preparation method thereof are disclosed, wherein the test fluid mainly comprises silicotungstic acid, an oxygen scavenger, a corrosion inhibitor and a pH regulator. The oxygen scavenger is at least one of thiourea, sodium thiosulfate, sodium sulfite, sodium dithionite and hydrazine.
In other embodiments of the present invention, the oxygen scavenger is thiourea and/or sodium thiosulfate.
In other embodiments of the present invention, the raw material further comprises a corrosion inhibitor, wherein the corrosion inhibitor is at least one of WH-1, CA101 and TY-2.
In other embodiments of the present invention, the raw material further includes a pH adjuster, and the pH adjuster is at least one of sodium hydroxide, sodium carbonate, and sodium bicarbonate.
The invention also provides a technical method:
the preparation method of the solid-free ultrahigh-density well completion testing solution comprises the following steps:
dissolving solid silicotungstic acid by using clear water, uniformly mixing to obtain a mixed solution, and cooling the mixed solution to room temperature. After cooling, adding an oxygen scavenger into the silicotungstic acid solution, then adding a pH regulator, and if an exothermic phenomenon (such as using sodium hydroxide or sodium carbonate) occurs, adding a corrosion inhibitor after the solution is cooled to room temperature.
In detail, the silicotungstic acid solid raw material for preparing the solid-free ultra-high density well completion test solution is uniformly prepared in a beaker according to the amount, the raw material in the beaker is added into a corresponding amount of water, the raw material is stirred to enable the solid content to be completely dissolved in the water, the silicotungstic acid solution with uniform mixing is naturally cooled to the room temperature, and the sealed storage is carried out by a sealer. The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Adding a corresponding amount of clear water into a 1000ml beaker according to the data in the table 1, then adding silicotungstic acid with corresponding different mass fractions as a soluble weighting material, and stirring for 15min until the silicotungstic acid is completely dissolved; then 8% pH regulator is added to make the solution alkaline, the pH value of the solution is 8.5, and the solution is cooled to room temperature. The volumes of the solid-free ultra-high density well completion test solution with different mass concentrations are prepared according to different proportions, and the density of the solid-free ultra-high density well completion test solution is detected by a pycnometer method. The results are shown in Table 1.
TABLE 1 relationship of the density and mass fraction of heteropoly acid solution measured by pycnometer method
From the data in table 1, it can be seen that the density of the solidless ultra-high density completion test fluid can be controlled by varying its mass concentration. As can be seen from the example, the solubility of silicotungstic acid in the test can even reach more than 75 percent, and the corresponding solution density is as high as 2.9g/cm3。
Example 2
Adding different amounts of clear water into a 1000ml beaker, then adding silicotungstic acid with corresponding different mass fractions as a soluble weighting material, stirring for 15min until the silicotungstic acid is completely dissolved, stirring uniformly, preparing volumes with different mass concentrations of the solid-free ultra-high density well completion test solution according to different proportions, and detecting the density of the solid-free ultra-high density well completion test solution by a pycnometer method. The apparent viscosity of the solution at different temperatures was measured by a viscometer during the heating process of the solution from 20 ℃ to 80 ℃, and the detailed change data of the measurement is shown in table 2.
TABLE 2 summary of viscosity-temperature data of temperature-resistant low-corrosion high-density solid-free testing fluids
As can be seen from the data in table 2, the effect of the density on the viscosity of the test fluid is greater than the effect of the temperature on the viscosity of the test fluid, and as the density of the test fluid for the solid-free ultra-high density well completion increases, the viscosity gradually increases and the stability of the heating process is good.
Example 3
Adding different amounts of clear water into a 1000ml beaker, then adding 60% of silicotungstic acid serving as a soluble weighting material by mass percent, and stirring for 15min until the materials are completely dissolved; then adding 0.02% thiourea solution as an oxygen scavenger, and stirring uniformly. Then 8% pH regulator is added to make the solution alkaline, the pH value of the solution is 8.5, and the solution is cooled to room temperature. Finally, 2% of 3 different kinds of corrosion inhibitors were added to the samples, wherein the blank control group was not added with a corrosion inhibitor.
The solid-free ultra-high density well completion test solution is prepared according to the surface-to-volume ratio of solution amount to steel sheet of 20mL/cm2Loading into high temperature reaction container, hanging N80 steel sheets (standard type I) according to two sheets, respectively, and adding solid-free phase-free ultramicro powder with calculated volumeIn the high-density well completion test solution, a container is sealed, the container is placed in a constant-temperature drying box at 180 +/-2 ℃, and a hanging piece is kept still for 72 hours to carry out a static hanging piece corrosion experiment. And opening the oven after the high temperature reaches the preset time, taking out the high-temperature reaction container, taking out the corrosion test piece after the high-temperature reaction container is cooled, weighing the mass of the test piece after the corrosion test piece is subjected to membrane removal treatment by absolute ethyl alcohol and distilled water and is dried, comparing the mass with the initial mass, and calculating the corrosion rate. Simultaneously, a blank experiment is carried out: the weight loss of the blank test piece which is corroded by the acid stripping solution is less than 0.01g, otherwise, the test piece should be replaced. Specific data for static coupon corrosion tests for different corrosion inhibitor types are shown in table 3.
TABLE 3 Corrosion inhibitor species screening
As can be seen from the data in Table 3, for the solutions with the same density before the corrosion experiment, no matter the average corrosion rate or the density of the solution after the corrosion experiment, the test effect of the corrosion inhibitor CA101 is obviously better than that of the other 2 corrosion inhibitors and the blank control group, so that the CA101 is selected as the corrosion inhibitor of the solution.
Example 4
Adding different amounts of clear water into a 1000ml beaker, then adding 60% of silicotungstic acid serving as a soluble weighting material by mass percent, and stirring for 15min until the materials are completely dissolved; then 0.02 percent of thiourea and 0.03 percent of sodium thiosulfate solution are added as deoxidant and stirred evenly. Then 8% pH regulator is added to make the solution alkaline, the pH value of the solution is 8.5, and the solution is cooled to room temperature. Finally, CA101 was added to the sample according to the corrosion inhibitor concentration of Table 4.
The solid-free ultra-high density well completion test solution is prepared according to the surface-to-volume ratio of solution amount to steel sheet of 20mL/cm2Loading the materials into a high-temperature reaction container, hanging N80 steel sheets (standard type I) according to a group of two sheets, respectively, putting the two sheets into high-density solid-free test solution with a calculated volume, sealing the container, putting the container into a constant-temperature drying oven at 180 +/-2 ℃, standing for 72 hours, and carrying out a static coupon corrosion experiment. Opening the oven after the high temperature reaches the preset time, and taking out the high-temperature reaction containerAnd after the test piece is cooled, taking out the corrosion test piece, carrying out film removal treatment on the test piece by absolute ethyl alcohol and distilled water, drying, weighing the mass of the test piece, comparing the mass with the initial mass, and calculating the corrosion rate. Specific data for static coupon corrosion tests with different concentrations of corrosion inhibitor are shown in table 4.
The corrosion level is judged according to NACE RP0775-2005 standard: the corrosion rate is less than 0.025mm/a, and the corrosion is low; <0.12mm/a, moderate corrosion; <0.25mm/a, which is a strong corrosion; >0.25mm/a, is severely corroded.
TABLE 4 Corrosion inhibitor concentration screening
As can be seen from the data in Table 4, the solid-free ultra-high density completion testing fluid in the embodiment of the invention has better corrosion resistance at high temperature and has lower damage to downhole operation tools. The corrosion rate of the test solution can be obviously reduced by adding the corrosion inhibitor into the test solution, and when 5-8% of the corrosion inhibitor is added, the corrosion rate of the test solution at 180 ℃ can be reduced to the minimum.
The embodiments described above are some, but 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 (8)
1. A solid-free ultra-high density well completion test solution and a preparation method thereof are disclosed, which are composed of tungstate, an oxygen scavenger, a corrosion inhibitor and a pH regulator, and the solution is prepared by clear water, and is characterized by comprising the following components in percentage by mass: 0.02-0.05% of an oxygen scavenger and 28-75% of tungstate.
2. The solid-free ultra-high density completion testing fluid and the preparation method thereof of claim 1, wherein the oxygen scavenger is at least one of thiourea and sodium thiosulfate.
3. The solid-free ultra-high density completion testing fluid and the preparation method thereof as claimed in claim 1, wherein the tungstate is silicotungstic acid.
4. The completion testing fluid and its preparation method according to claim 1, wherein the raw materials further comprise corrosion inhibitor.
5. The solid-free ultra-high density completion testing fluid and the preparation method thereof according to claim 1, wherein the raw material further comprises a pH regulator.
6. The solid-free ultra-high density completion testing fluid and the preparation method thereof according to claim 5, wherein the pH regulator is at least one of sodium hydroxide, sodium carbonate and sodium bicarbonate.
7. The method for preparing a solid-free ultra-high density completion testing fluid according to any of claims 1 to 6, wherein the mixed solution obtained by uniformly dissolving said material with water is cooled to room temperature.
8. The method for preparing a solid-free ultra-high density completion testing fluid according to claim 6, wherein if the pH value of the mixed solution is adjusted by sodium hydroxide, a violent exothermic phenomenon occurs, and the mixed solution needs to be cooled to room temperature; if sodium carbonate is used, a small amount of heat can be released; the use of sodium bicarbonate causes an endothermic phenomenon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189907.6A CN110924929A (en) | 2019-11-28 | 2019-11-28 | Solid-free ultrahigh-density well completion testing fluid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189907.6A CN110924929A (en) | 2019-11-28 | 2019-11-28 | Solid-free ultrahigh-density well completion testing fluid and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110924929A true CN110924929A (en) | 2020-03-27 |
Family
ID=69846750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911189907.6A Pending CN110924929A (en) | 2019-11-28 | 2019-11-28 | Solid-free ultrahigh-density well completion testing fluid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110924929A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112552886A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003018708A2 (en) * | 2001-08-10 | 2003-03-06 | Cabot Specialty Fluids, Inc. | Alkali metal tungstate compositions and uses thereof |
| US20080135302A1 (en) * | 2004-12-14 | 2008-06-12 | Hui Zhang | High Density Brines For Use In Wellbore Fluids |
| US20090029878A1 (en) * | 2007-07-24 | 2009-01-29 | Jozef Bicerano | Drilling fluid, drill-in fluid, completition fluid, and workover fluid additive compositions containing thermoset nanocomposite particles; and applications for fluid loss control and wellbore strengthening |
| CN103333666A (en) * | 2013-06-14 | 2013-10-02 | 中国石油化工股份有限公司 | Solid-free well-completion confining liquid and preparation method thereof |
| CN103827251A (en) * | 2011-06-29 | 2014-05-28 | 卡博特专业流体股份有限公司 | Hydrocarbon-based drilling fluids containing cesium phosphate |
| CN104736660A (en) * | 2012-10-02 | 2015-06-24 | 切弗朗菲利浦化学公司 | High density weight materials for oil field servicing operations |
| CN104898179A (en) * | 2015-05-19 | 2015-09-09 | 中国海洋石油总公司 | Deepwater test liquid of complexing water base |
| CN107642357A (en) * | 2017-09-15 | 2018-01-30 | 西南石油大学 | A kind of temperature resistance type low corrosion high density Solid Free test fluid and preparation method thereof |
-
2019
- 2019-11-28 CN CN201911189907.6A patent/CN110924929A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003018708A2 (en) * | 2001-08-10 | 2003-03-06 | Cabot Specialty Fluids, Inc. | Alkali metal tungstate compositions and uses thereof |
| US20080135302A1 (en) * | 2004-12-14 | 2008-06-12 | Hui Zhang | High Density Brines For Use In Wellbore Fluids |
| US20090029878A1 (en) * | 2007-07-24 | 2009-01-29 | Jozef Bicerano | Drilling fluid, drill-in fluid, completition fluid, and workover fluid additive compositions containing thermoset nanocomposite particles; and applications for fluid loss control and wellbore strengthening |
| CN103827251A (en) * | 2011-06-29 | 2014-05-28 | 卡博特专业流体股份有限公司 | Hydrocarbon-based drilling fluids containing cesium phosphate |
| CN104736660A (en) * | 2012-10-02 | 2015-06-24 | 切弗朗菲利浦化学公司 | High density weight materials for oil field servicing operations |
| CN103333666A (en) * | 2013-06-14 | 2013-10-02 | 中国石油化工股份有限公司 | Solid-free well-completion confining liquid and preparation method thereof |
| CN104898179A (en) * | 2015-05-19 | 2015-09-09 | 中国海洋石油总公司 | Deepwater test liquid of complexing water base |
| CN107642357A (en) * | 2017-09-15 | 2018-01-30 | 西南石油大学 | A kind of temperature resistance type low corrosion high density Solid Free test fluid and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112552886A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
| CN112552886B (en) * | 2020-12-20 | 2023-03-10 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2017206066B2 (en) | Methods of logging | |
| US4830765A (en) | Modified non-polluting liquid phase shale swelling inhibition drilling fluid and method of using same | |
| US8969260B2 (en) | Glycerol based drilling fluids | |
| WO1997026311A1 (en) | High density viscosified aqueous compositions | |
| WO2008096147A1 (en) | Water-based drilling fluid | |
| WO2017075348A1 (en) | Synthetic polymer based fluid loss pill | |
| CA1197673A (en) | Corrosion inhibited high density fluid compositions | |
| US4465601A (en) | Composition and method for servicing wellbores | |
| CN110951468A (en) | Ocean high-temperature high-pressure water-based drilling fluid | |
| CN110924929A (en) | Solid-free ultrahigh-density well completion testing fluid and preparation method thereof | |
| EP0194254B1 (en) | High-density brine fluid and use in servicing wellbores | |
| US4559149A (en) | Workover fluid | |
| WO2019036261A1 (en) | Layered double hydroxides for oil-based drilling fluids | |
| AU2020296809A1 (en) | Crosslinked synthetic polymer-based reservoir drilling fluid | |
| GB2090308A (en) | Stabilized solutions of modified cellulose in brine and their use as completion and workover fluids | |
| US3956142A (en) | Noncorroding water base drilling fluids and additive system for making | |
| Aremu et al. | POTENTIAL OF LOCAL PH CONTROL ADDITIVES FOR CORROSION INHIBITION IN WATER BASE DRILLING FLUIDS. | |
| EP1814961B1 (en) | Environmentally friendly water based mud deflocculant/thinner | |
| Jie | Performance evaluation and field application of new water-based drilling fluid system in protecting shale gas reservoir | |
| CN110423597A (en) | Modified ketal of a kind of nanometer of sealing agent and preparation method thereof and oil field drilling fluids | |
| Jiaojiao et al. | Scale deposition mechanism and low-damage underbalanced drilling fluids for high CO2 content gas reservoirs | |
| CN116120904A (en) | High-temperature-resistant high-density solid-free anti-collapse drilling fluid | |
| CA2624737A1 (en) | Low toxicity shale hydration inhibition agent and method of use | |
| US10640694B2 (en) | Compositions and methods of making of shale inhibition fluids | |
| CA1210929A (en) | Composition and method for servicing wellbores |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200327 |
|
| WD01 | Invention patent application deemed withdrawn after publication |