CN113025295A - Low-temperature blocking remover for oil and gas wells, preparation method and application - Google Patents
Low-temperature blocking remover for oil and gas wells, preparation method and application Download PDFInfo
- Publication number
- CN113025295A CN113025295A CN202110575610.4A CN202110575610A CN113025295A CN 113025295 A CN113025295 A CN 113025295A CN 202110575610 A CN202110575610 A CN 202110575610A CN 113025295 A CN113025295 A CN 113025295A
- Authority
- CN
- China
- Prior art keywords
- blocking remover
- oil
- low
- gas well
- temperature
- 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
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The invention belongs to the technical field of blockage removal of oil and gas wells, and particularly relates to a low-temperature blockage removal agent for an oil and gas well, a preparation method and application. The blocking remover is prepared from the following raw materials in parts by mass: 5-20% of main agent DTPA, 1-3% of auxiliary agent EDTA, 1-2% of suspending agent, 1-3% of anionic emulsifier, 0.5-1% of lubricant and the balance of water; the suspending agent is bentonite or diatomite; the lubricant is a liquid oily substance. The blocking remover provided by the invention has higher descaling efficiency, can also have higher corrosion rate on barium sulfate at a low temperature of 45 ℃, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of blockage removal of oil and gas wells, and particularly relates to a low-temperature blockage removal agent for an oil and gas well, a preparation method and application.
Background
A plurality of plugs can be formed in a shaft and a ground pipeline in the oil and gas production process, the plugs can influence the oil and gas production, the pipeline pressure can be changed, the service life of a pipeline is influenced, and potential safety hazards are caused. The most common plug in oil and gas production contains divalent barium ions, the most common plug type is barium strontium scale, which is a very stable plug and is difficult to dissolve in acid or alkaline conditions, so the barium strontium scale is a great problem for blocking an oil and gas well.
Because the barium and strontium scale is hard and compact and the descaling effect is poor by a physical method, a chemical blocking remover is often adopted for removing the barium and strontium scale in the prior art. The most common chemical blocking remover comprises an organic complexing agent which is a complex taking an organic group as a ligand, such as an aminocarboxylate complexing agent, wherein the aminocarboxylate complexing agent can form a stable and easily-soluble complex with various metal ions, and is widely applied to treating the blockage with divalent calcium ions, divalent magnesium ions, divalent barium ions and the like as main components. The common chelating agents comprise EDTA, DTPA, HEDTA, NTA, DOTA, DCTA, TTHA and the like, wherein the molecular structural formula of DTPA is shown in the attached figure 1 of the specification, the price is moderate, the scale dissolving capacity reaches about 10.2g/L, and the comprehensive scale removing capacity is superior to that of other chelating agents. Because the single DTPA has limited scale dissolving capacity, when the single DTPA is used as a main scale removing agent, a person skilled in the art can additionally add low molecular weight sodium polyacrylate as an auxiliary agent to improve the scale dissolving capacity of the single DTPA, and researches show that the scale dissolving effect of the blocking remover is better when the reaction temperature is over 90 ℃, and the scale dissolving effect of the blocking remover is best when the reaction temperature is 150-170 ℃. However, the temperature range of the oil and gas well is not only above 90 ℃, but also in the normal temperature range or the temperature range lower than 90 ℃, barium and strontium scales can be generated at the oil and gas well positions in the temperature sections, and the scale dissolving effect of the blocking remover combining DTPA with low-molecular-weight sodium polyacrylate is unsatisfactory.
In addition, Chinese patent CN106867490B also discloses a chelating blocking remover suitable for complex scaling reservoirs and a preparation method thereof, wherein the chelating blocking remover comprises the following components in percentage by mass: 5 to 20 percent of chelating agent; 0.5 to 1 percent of scale inhibitor; 1 to 5 percent of activating agent; 0.5 to 2 percent of penetrant; the balance of the water is distilled water. The chelating blocking remover can remove most of complex plugs formed by complex inorganic scale such as carbonic acid scale, sulfuric acid scale and the like and organic scale in a near-wellbore area of a scaling oil reservoir, inhibit scale generation and prolong the action time. The chelating blocking remover mainly aims at the blockage of complex scales such as calcium carbonate, calcium sulfate, barium strontium sulfate scales, iron sulfide and the like, removes scaling blockage through osmotic dispersion, chelating solubilization and crystal nucleus distortion, dredges a seepage channel between a shaft and a stratum, reduces the resistance of oil-gas water flow, improves the yield of an oil-gas well, and reduces the injection pressure of a water injection well; meanwhile, the chelating blocking remover has certain corrosion inhibition and corrosion resistance, and meets the blocking removal condition of a complex scaling reservoir stratum. The specification of the patent describes the scale dissolving effect of calcium carbonate, magnesium carbonate and marble under the reaction condition of 60 ℃, and the corrosion rate is between 22.10 and 60.35 percent, however, the reaction temperature of the patent still needs to be above 60 ℃, and the effective scale removal of the blockage section at the temperature below 60 ℃ cannot be carried out.
In conclusion, the prior art has the problem that a blocking remover suitable for a low-temperature environment below 60 ℃ is lacked.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-temperature blocking remover for an oil-gas well, a preparation method and application.
The invention provides a low-temperature blocking remover for an oil and gas well, which is prepared from the following raw materials in parts by mass: 5-20% of main agent DTPA, 1-3% of auxiliary agent EDTA, 1-2% of suspending agent, 1-3% of anionic emulsifier, 0.5-1% of lubricant and the balance of water;
the suspending agent is bentonite or diatomite;
the lubricant is a liquid oily substance.
Preferably, in the low-temperature blocking remover for oil and gas wells, the anionic emulsifier is sodium dodecyl sulfate, fatty acid soap or sodium dodecyl sulfate.
Preferably, the liquid oily substance is liquid paraffin or glycerol.
Based on the same inventive concept, the invention provides a preparation method of an oil and gas well low-temperature blocking remover, the oil and gas well low-temperature blocking remover comprises a blocking remover A and a blocking remover B, and the blocking remover A and the blocking remover B are prepared according to the following steps:
weighing the raw materials according to the mass fraction required for preparing the low-temperature blocking remover for the oil and gas well;
grinding the suspending agent into suspending agent powder with the particle size of 100-200 meshes;
mixing the DTPA, the EDTA, the suspending agent powder, the anionic emulsifier and 2/3 mass water to obtain a blocking remover A;
and mixing the lubricant with the residual mass of water to obtain the blocking remover B.
Based on the same invention concept, the invention provides the application of the low-temperature blocking remover for the oil and gas well, the low-temperature blocking remover for the oil and gas well is prepared by the preparation method of the blocking remover A and the blocking remover B, and the low-temperature blocking remover for the oil and gas well is used for eroding the blocking object of the oil and gas well.
Preferably, in the application of the low-temperature blocking remover for the oil and gas well, the application method of the low-temperature blocking remover for the oil and gas well is as follows: and injecting the blocking remover A into the blocked part, recovering the dissolved materials after the blocking object is dissolved, then injecting the blocking remover B into the blocked part, and recovering the redundant materials after the blocked part is lubricated.
Preferably, in the application of the low-temperature blocking remover for the oil and gas well, the volume ratio of the blocking remover A to the blocking remover B is 2: 1.
Preferably, in the application of the low-temperature blocking remover for the oil and gas well, the application method of the low-temperature blocking remover for the oil and gas well is as follows: mixing the blocking remover A and the blocking remover B, spraying a mixed solution to a blocked part, wherein the flow rate of the mixed solution is 5-10 mL/min; and circularly operating according to the programs of spraying for 5-10min and soaking for 20-60min until the blockage is removed.
Preferably, in the application of the low-temperature blocking remover for the oil and gas well, the plug is barium strontium scale.
Preferably, in the application of the low-temperature blocking remover for the oil and gas well, the barium strontium scale contains barium sulfate.
Compared with the prior art, the invention has the following beneficial effects:
in the blocking remover, the main agent DTPA and the auxiliary agent EDTA play a role of chelating and react with divalent barium ions (Ba) in the blocking object in the oil-gas well2+) Divalent strontium ion (Sr)2+) The metal ions chelate to dissolve the blockage, which mainly contributes to blockage removal; the reason why the DTPA and the EDTA are selected to be combined is that the DTPA and the EDTA have different structures, the electron clouds in the molecular structures have different sizes, the charge accumulation directions are different, and the DTPA and the EDTA have the complementary effect; after the blocking object is dissolved in DTPA and EDTA, the blocking object can take suspending agent particles as condensation centers, is quickly adsorbed on the surface of the blocking object, accelerates the separation from the pipeline wall of the oil-gas well, and accelerates the separationDescaling; in addition, although the suspending agent is solid particles, under the use method of the low-temperature blocking remover for the oil and gas well, the suspending agent does not form new precipitates on the pipeline wall of the oil and gas well, but has an attraction effect on the original blockage on the pipeline wall by utilizing the friction force and van der Waals force between the solid particles in the process of contacting and separating the suspending agent and the pipeline wall, so that the descaling and blocking removing efficiency is improved; the surface smoothness of the pipeline wall is poor after the plug is removed, the lubricant has the effects of enhancing the lubricating effect of the oil-gas well pipeline wall, reducing the bonding force between the plug and the pipeline wall, preventing the dissolved plug from precipitating again after the plug is removed, and preventing the generation of new precipitate on the pipeline wall; the reason for selecting anionic emulsifiers in the present invention is that the emulsifiers ionize in water to form hydrophilic groups with anions, which can promote mixing with suspending agents and the like on one hand, and can attract cations in plugs in an opposite way to provide attraction for dissociation of the cations from the plugs, thereby enhancing the chelating descaling effect of DTPA and EDTA.
The blocking remover provided by the invention has higher oil and gas well descaling efficiency, can have higher corrosion rate to barium sulfate at a low temperature of 45 ℃, and has good application prospect.
Drawings
FIG. 1 shows the molecular structure of DTPA of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention to be implemented, the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
In the description of the present invention, reagents used are commercially available and methods used are conventional in the art, unless otherwise specified.
Example 1
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 5% of main agent DTPA, 1% of auxiliary agent EDTA, 1% of suspending agent, 1% of anionic emulsifier, 0.5% of lubricant and the balance of water; the suspending agent is bentonite; the lubricant is liquid paraffin; the anionic emulsifier is sodium dodecyl sulfate.
Example 2
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: the main agent DTPA is 20 percent, the auxiliary agent EDTA is 3 percent, the suspending agent is 2 percent, the anionic emulsifier is 3 percent, the lubricant is 1 percent, and the balance is water; the suspending agent is bentonite; the lubricant is liquid paraffin; the anionic emulsifier is sodium dodecyl sulfate.
Example 3
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 10% of main agent DTPA, 2% of auxiliary agent EDTA, 1.5% of suspending agent, 2% of anionic emulsifier, 0.58% of lubricant and the balance of water; the suspending agent is bentonite; the lubricant is liquid paraffin; the anionic emulsifier is sodium dodecyl sulfate.
Example 4
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 5% of main agent DTPA, 1% of auxiliary agent EDTA, 1% of suspending agent, 1% of anionic emulsifier, 0.5% of lubricant and the balance of water; the suspending agent is diatomite; the lubricant is liquid glycerol; the anionic emulsifier is fatty acid soap.
Example 5
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 5% of main agent DTPA, 1% of auxiliary agent EDTA, 1% of suspending agent, 1% of anionic emulsifier, 0.5% of lubricant and the balance of water; the suspending agent is bentonite; the lubricant is liquid glycerol; the anionic emulsifier is sodium dodecyl sulfate.
Example 6
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 5% of main agent DTPA, 1% of auxiliary agent EDTA, 1% of suspending agent, 1% of anionic emulsifier, 0.5% of lubricant and the balance of water; the suspending agent is bentonite; the lubricant is liquid illegal cooking oil; the anionic emulsifier is sodium dodecyl sulfate.
Example 7
The low-temperature blocking remover for the oil and gas well is prepared from the following raw materials in parts by mass: 15% of main agent DTPA, 1.5% of auxiliary agent EDTA, 1% of suspending agent, 1.5% of anionic emulsifier, 0.9% of lubricant and the balance of water; the suspending agent is bentonite; the lubricant is liquid paraffin; the anionic emulsifier is sodium dodecyl sulfate.
Example 8
The preparation method of the low-temperature blocking remover for the oil and gas well comprises the following steps of:
weighing the raw materials according to any mass fraction ratio in the embodiments 1-7;
grinding the suspending agent into suspending agent powder with the particle size of 200 meshes;
fully mixing DTPA, EDTA, suspending agent powder, anionic emulsifier and 2/3 mass of water to obtain a blocking remover A;
uniformly mixing the lubricant with the residual mass of water to obtain a blocking remover B;
the blocking remover A and the blocking remover B are used in combination.
The blocking remover products prepared in the mass fraction ratios of the examples 1 to 7 are respectively named as experimental products 1 to 7.
Example 9
The preparation method of the low-temperature blocking remover for the oil and gas well comprises the following steps of:
weighing the raw materials according to any mass fraction ratio in the embodiments 1-7;
grinding the suspending agent into suspending agent powder with the particle size of 100 meshes;
uniformly mixing DTPA, EDTA, suspending agent powder, anionic emulsifier and 2/3 mass of water to obtain a blocking remover A;
uniformly mixing the lubricant with the residual mass of water to obtain a blocking remover B;
the blocking remover A and the blocking remover B are used in combination.
Example 10
The application of the low-temperature blocking remover for the oil and gas well specifically comprises the following steps of carrying out low-temperature blocking removal on the oil and gas well by using any one of the products 1 to 7 prepared in the embodiment 8: injecting a blocking remover A into the blocked part, and after the blocking object is dissolved, injecting a blocking remover B into the blocked part; the volume ratio of the blocking remover A to the blocking remover B is 2: 1.
In order to reduce the pollution of the blocking remover to the oil and gas well, equipment capable of recovering materials can be adopted to recover redundant materials during the blocking removing operation.
The total usage amount of the blocking remover is 10-100ml/g of plug, such as 10ml/g of plug, 30ml/g of plug or 100ml/g of plug. In the practical application process, the surface area of the plug is estimated and then is 50-200ml/dm2In an amount of, e.g., 50ml/dm2、100ml/dm2、150ml/dm2、200ml/dm2。
Example 11
The application of the low-temperature blocking remover for the oil and gas well specifically comprises the following steps of carrying out low-temperature blocking removal on the oil and gas well by using any one of the products 1 to 7 prepared in the embodiment 8: mixing the blocking remover A and the blocking remover B according to the volume ratio of 2:1, wherein the flow rate of the mixed solution is 5-10mL/min by adopting a spray head spraying or high-pressure spray head spraying mode; for example, 5mL/min, 8mL/min or 10 mL/min; and (4) circularly operating according to the programs of spraying for 5-10min and soaking for 20-60min until the blockage is dissolved. The preferred procedure is a cyclic operation of spraying for 5min and soaking for 20 min.
In order to reduce the pollution of the blocking remover to the oil and gas well, equipment capable of recovering materials can be adopted to recover redundant materials during the blocking removing operation.
Experimental example 1
In the experimental example, 4 experimental oil gas wells to be unblocked are selected, the depth of the experimental section well is selected from 20-50m, the length of the experimental section well is 1m, the blocking remover used in the experiment is 1-4 of the experimental article mentioned in the embodiment 8, each experimental article corresponds to 1 experimental oil gas well, and through detection, the main component of the blockage of the experimental oil gas well is divalent barium ions; the method in embodiment 10 is referred to for performing the blockage relieving operation on the experimental section well, and specifically includes the following steps: injecting a blocking remover A2L into each blocked part of the experimental section well, wherein the total dosage of each blocked part is 500mL, the injection is divided into four times, and the interval between adjacent injection operations is 40 min; and (4) injecting a blocking remover B into each blocked part of the experimental section well after the last injection and staying for 40min, wherein the total dosage of each blocked part is 1L.
Through observation, the blockages in the experimental oil gas well are all cleared, and no residue is left.
Experimental example 2
In the experimental example, 3 experimental oil gas wells to be unblocked are selected, the depth of the experimental section well is selected from 20-50m, the length of the experimental section well is 1m, the blocking remover used in the experiment is 5-7 of the experimental article mentioned in the embodiment 8, each experimental article corresponds to 1 experimental oil gas well, and the main component of the blockage of the experimental oil gas well is divalent barium ions through detection; the method in embodiment 11 is referred to for performing the blockage relieving operation on the experimental section well, and specifically includes the following steps: and mixing the blocking remover A and the blocking remover B, spraying the mixed solution into the experiment section well in a spray head spraying mode, paying attention to the fact that the spraying area of the spray head is required to cover all blocked parts in the experiment section well, simultaneously spraying by adopting a plurality of spray heads if necessary, wherein the total spraying flow of all the spray heads is 10mL/min per oil gas well, and circularly operating according to the procedures of spraying for 5min and soaking for 20min until the blocking matters are dissolved.
Through observation, the blockages in the experimental oil gas well are all cleared, and no residue is left.
Experimental example 3
Because the number of the experimental oil gas wells is limited, in the experimental example, 1 experimental oil well to be unblocked is selected, a full-well unblocking experiment is carried out on a Ganguyi oil field 6014 well, and the unblocking agent used in the experiment is an experimental article 1; the method of experimental example 2 is referred to perform blockage removal operation on the experimental section well, and specifically comprises the following steps: and mixing the blocking remover A and the blocking remover B, spraying the mixed solution into the experiment section well in a spray head spraying mode, paying attention to the fact that the spraying area of the spray head is required to cover all blocked parts in the experiment section well, simultaneously spraying by adopting a plurality of spray heads if necessary, wherein the total spraying flow of all the spray heads is 10mL/min, and circularly operating according to the procedures of spraying for 5min and soaking for 20min until the blocking substances are dissolved. Tests show that the daily output of the well is 0.60t before the blockage removing operation, and the daily output of the well reaches 0.71t after the blockage removing operation.
Experimental example 4 influence of different temperatures on deblocking Effect
Since the most difficult-to-remove barium-strontium scale in oil and gas wells is based on barium sulfate, examples 4-6 all discuss the corrosion effect of the blocking remover on barium sulfate. The specific experimental conditions of experimental example 4 were as follows: adding 2g of barium sulfate powder into a beaker to prepare a simulated plug, preparing 6 parts of the simulated plug according to the proportion, and then respectively adding 100mL of experimental liquid 1-6, wherein the experimental liquid 1 is a mixture of the blocking remover A of the experimental article 1 and deionized water with the mass equivalent to that of the blocking remover B of the experimental article 1 in example 8, and the experimental liquids 2-3 respectively correspond to 100mL of a mixture of the blocking remover A of the experimental articles 2-3 and deionized water with the mass equivalent to that of the blocking remover B of the experimental articles 2-3; the experimental solutions 4-6 are 100mL of the mixture of the blocking remover A and the blocking remover B of the experimental products 1-3 respectively; in the experimental liquid, the volume ratio of the blocking remover A to the blocking remover B or the volume ratio of the blocking remover A to the deionized water for replacing the blocking remover B is 2: 1; the pH of the test solutions 1-6 was adjusted to 9.0. Stirring the samples of the experimental group at the rotating speed of 20rpm at the conditions of 45 ℃, 60 ℃ and 90 ℃ for 2 hours, filtering, drying filter residues, weighing the weight of solids, and calculating the corrosion rate eta of the barium sulfate. The calculation formula is as follows:
η = (M1 + M2-M3) × 100%/(M1 + M2) formula (1)
Wherein M1 represents the mass of barium sulfate powder before dissolution, g; m2 represents the mass of the suspending agent, and the rest substances of the blocking remover are miscible or miscible with water, so the mass change g of the blocking remover is not counted; m3 represents the total amount of solids, g, remaining in the solution after dissolution of the barium sulfate powder.
The results are shown in the following tables 1-3, and the results in the tables 1-3 show that when the blocking remover A is used as the main action substance, the corrosion rate of the experimental groups 1-3 is between 8.57% and 13.75%, and when the blocking remover A and the blocking remover B are used together, the corrosion rate of the experimental groups 4-6 is between 9.33% and 14.25%, and the corrosion effect is better under the condition of 45-90 ℃.
TABLE 1 dissolution rates of experimental groups 1-2 at different temperatures
TABLE 2 dissolution rates of experimental groups 3-4 at different temperatures
TABLE 3 dissolution rates of experimental groups 5-6 at different temperatures
Experimental example 5 Effect of different time on deblocking Effect
The specific experimental conditions of experimental example 5 were as follows: adding 2g of barium sulfate powder into a beaker to prepare a simulated plug, preparing 6 parts of the simulated plug according to the proportion, and then respectively adding an experimental solution 4 into the simulated plug, wherein the experimental solution 4 is 100mL (corresponding to the experimental solution 4 in the experimental example 4) of a mixture of a blocking remover A and a blocking remover B of an experimental article 1, and the volume ratio of the blocking remover A to the blocking remover B is 2: 1; the pH of each test solution was adjusted to 9.0. Stirring the samples of the 6 experimental groups at the rotating speed of 20rpm at the temperature of 45 ℃ and 60 ℃ for 2h, 4h and 6h (one experimental group corresponds to one experimental parameter combination), filtering, drying filter residues, weighing the weight of the solid, and calculating the corrosion rate eta of the barium sulfate according to the formula (1).
The results are shown in table 4 below, and table 4 shows that the erosion efficiency gradually increases with time, but the later growth rate is gentle.
TABLE 4 corrosion rates of barium sulfate at different times
Experimental example 6 Effect of different deblocking agent Components on deblocking Effect
The specific experimental conditions of experimental example 6 were as follows: adding 2g of barium sulfate powder into a beaker to prepare a simulated plug, preparing 7 parts of the simulated plug according to the mixture ratio, selecting 5 parts of the simulated plug, and then respectively adding 100mL of a mixture of a blocking remover A and a blocking remover B of the experimental products 1 and 4 to 7 in example 8 into experimental liquids 7 to 11, wherein the volume ratio of the blocking remover A to the blocking remover B is 2: 1; the pH of the test solutions 7-11 was adjusted to 9.0. An equivalent amount of deionized water was substituted for the suspending agent in test solution 7 to set up test group 6, which was added to 1 part of the simulated plugs and the pH of the solution was adjusted to 9.0. 100mL of a deblocking agent (reference: Zhaoliqiang, Wangchun, Yuan Hua, etc.. high temperature resistant barium sulfate deblocking agent development and performance evaluation [ J ] oil and gas reservoir evaluation and development, 2016 (6)) added with a' 5% main agent, 0.5% auxiliary agent and deionized water as a solvent is used as a control group, and the deblocking agent is added into 1 part of simulated plugs, and the pH of the solution is adjusted to 9.0. Stirring the samples of the experimental group and the control group at the rotating speed of 20rpm at the temperature of 45 ℃ and 60 ℃ for 2 hours, filtering, drying filter residues, weighing the weight of solids, and calculating the corrosion rate eta of the barium sulfate. See experimental example 4 for a specific calculation formula.
The results are shown in tables 5-7 below, and the results in tables 5-7 show that the corrosion rates of the deblocking agents of the examples of the present invention are high compared to the control group. The results show that the erosion rate of the deblocking agent is lower than the test groups 1-5 after replacing the suspending agent with an equal amount of deionized water.
TABLE 5 Corrosion Rate of barium sulfate for different deblocking agent compositions of Experimental groups 1-2
TABLE 6 corrosion rates of barium sulfate for different deblocking agent compositions of experimental groups 3-4
TABLE 7 Corrosion Rate of barium sulfate of different deblocking agent Components of Experimental groups 5-6 and control group
It should be noted that, when the present invention relates to a numerical range, it should be understood that two endpoints of each numerical range and any value between the two endpoints can be selected, and since the steps and methods adopted are the same as those in the embodiment, in order to prevent redundancy, the present invention describes a preferred embodiment. While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The low-temperature blocking remover for the oil and gas well is characterized by being prepared from the following raw materials in parts by mass: 5-20% of main agent DTPA, 1-3% of auxiliary agent EDTA, 1-2% of suspending agent, 1-3% of anionic emulsifier, 0.5-1% of lubricant and the balance of water;
the suspending agent is bentonite or diatomite;
the lubricant is a liquid oily substance.
2. The low-temperature blocking remover for oil and gas wells according to claim 1, wherein the anionic emulsifier is sodium dodecyl sulfate, fatty acid soap or sodium dodecyl sulfate.
3. The low-temperature blocking remover for oil and gas wells according to claim 1, wherein the liquid oily substance is liquid paraffin or glycerol.
4. The preparation method of the low-temperature blocking remover for the oil and gas well is characterized in that the low-temperature blocking remover for the oil and gas well comprises a blocking remover A and a blocking remover B, and the blocking remover A and the blocking remover B are prepared according to the following steps:
weighing the raw materials according to the mass fraction of claim 1;
grinding the suspending agent into suspending agent powder with the particle size of 100-200 meshes;
mixing the DTPA, the EDTA, the suspending agent powder, the anionic emulsifier and 2/3 mass water to obtain a blocking remover A;
and mixing the lubricant with the residual mass of water to obtain the blocking remover B.
5. The use of the low-temperature blocking remover for the oil and gas well is characterized in that the low-temperature blocking remover for the oil and gas well is prepared by the method according to claim 4 and is used for dissolving and eroding oil and gas well plugs.
6. The use of the oil and gas well low-temperature blocking remover according to claim 5, wherein the use method of the oil and gas well low-temperature blocking remover is as follows: and injecting the blocking remover A into the blocked part, recovering the dissolved materials after the blocking object is dissolved, then injecting the blocking remover B into the blocked part, and recovering the redundant materials after the blocked part is lubricated.
7. The use of the low-temperature blocking remover for oil and gas wells as claimed in claim 6, wherein the volume ratio of the blocking remover A to the blocking remover B is 2: 1.
8. The use of the oil and gas well low-temperature blocking remover according to claim 5, wherein the use method of the oil and gas well low-temperature blocking remover is as follows: mixing the blocking remover A and the blocking remover B, spraying a mixed solution to a blocked part, wherein the flow rate of the mixed solution is 5-10 mL/min; and circularly operating according to the programs of spraying for 5-10min and soaking for 20-60min until the blockage is removed.
9. Use of an oil and gas well low temperature blocking remover according to any one of claims 5-8, wherein the blocking material is barium strontium scale.
10. The use of the low-temperature blocking remover for oil and gas wells as claimed in claim 9, wherein the barium strontium scale contains barium sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575610.4A CN113025295A (en) | 2021-05-26 | 2021-05-26 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575610.4A CN113025295A (en) | 2021-05-26 | 2021-05-26 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113025295A true CN113025295A (en) | 2021-06-25 |
Family
ID=76455763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110575610.4A Pending CN113025295A (en) | 2021-05-26 | 2021-05-26 | Low-temperature blocking remover for oil and gas wells, preparation method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113025295A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531889A (en) * | 2009-04-13 | 2009-09-16 | 中国石油集团川庆钻探工程有限公司 | Oil-based stuck freeing fluid for well drilling |
| CN104987858A (en) * | 2015-07-24 | 2015-10-21 | 中国石油集团渤海钻探工程有限公司 | Barium-strontium scale cleaning agent and preparation method thereof |
| CN105927163A (en) * | 2016-04-26 | 2016-09-07 | 中国石油天然气股份有限公司 | Lubricating grease paraffin and scale control oil production strip and application thereof |
| CN106147735A (en) * | 2016-07-01 | 2016-11-23 | 中国石油集团渤海钻探工程有限公司 | A kind of barium strontium calcium scale remover and preparation method thereof |
| CN108690588A (en) * | 2018-05-08 | 2018-10-23 | 北京鼐宝隆能源科技有限公司 | Environment-friendly type de-plugging of well system, preparation method and its method for removing blockage |
| CA3016099A1 (en) * | 2017-09-01 | 2019-03-01 | Fluid Energy Group Ltd. | Composition useful in sulfate scale removal |
| CN111040751A (en) * | 2019-11-22 | 2020-04-21 | 大庆石油管理局有限公司 | Non-flowback stratum blocking remover for oil extraction |
| CN111961456A (en) * | 2020-08-19 | 2020-11-20 | 中国石油天然气股份有限公司 | Chelating injection-increasing agent for water injection well and preparation method thereof |
| CN112745820A (en) * | 2021-02-01 | 2021-05-04 | 西南石油大学 | Barium sulfate scale dissolving agent |
-
2021
- 2021-05-26 CN CN202110575610.4A patent/CN113025295A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531889A (en) * | 2009-04-13 | 2009-09-16 | 中国石油集团川庆钻探工程有限公司 | Oil-based stuck freeing fluid for well drilling |
| CN104987858A (en) * | 2015-07-24 | 2015-10-21 | 中国石油集团渤海钻探工程有限公司 | Barium-strontium scale cleaning agent and preparation method thereof |
| CN105927163A (en) * | 2016-04-26 | 2016-09-07 | 中国石油天然气股份有限公司 | Lubricating grease paraffin and scale control oil production strip and application thereof |
| CN106147735A (en) * | 2016-07-01 | 2016-11-23 | 中国石油集团渤海钻探工程有限公司 | A kind of barium strontium calcium scale remover and preparation method thereof |
| CA3016099A1 (en) * | 2017-09-01 | 2019-03-01 | Fluid Energy Group Ltd. | Composition useful in sulfate scale removal |
| CN108690588A (en) * | 2018-05-08 | 2018-10-23 | 北京鼐宝隆能源科技有限公司 | Environment-friendly type de-plugging of well system, preparation method and its method for removing blockage |
| CN111040751A (en) * | 2019-11-22 | 2020-04-21 | 大庆石油管理局有限公司 | Non-flowback stratum blocking remover for oil extraction |
| CN111961456A (en) * | 2020-08-19 | 2020-11-20 | 中国石油天然气股份有限公司 | Chelating injection-increasing agent for water injection well and preparation method thereof |
| CN112745820A (en) * | 2021-02-01 | 2021-05-04 | 西南石油大学 | Barium sulfate scale dissolving agent |
Non-Patent Citations (3)
| Title |
|---|
| 孙海虹 等: "油气田除垢机理与应用技术探讨", 《断块油气田》 * |
| 张剑波 等: "《清洁技术基础教程》", 31 July 2004, 中国环境科学出版社 * |
| 梁治齐: "《实用清洗技术手册》", 31 January 2000, 化学工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104194759B (en) | Oil extraction in oil field stratum neutral de-plugging agent composition and preparation method thereof | |
| RU2555970C2 (en) | Compositions for wells treatment with sustained release for use in well treatment liquids | |
| CN108690588A (en) | Environment-friendly type de-plugging of well system, preparation method and its method for removing blockage | |
| CN108865093B (en) | Infiltration-increasing blockage removing fluid for uranium mine and using method and application thereof | |
| CN109913192A (en) | Desalination de-plugging agent | |
| CN106811186A (en) | A kind of acidification blocking remover | |
| CN104640956A (en) | Method for dissolving deposits containing alkaline earth metal sulphates | |
| CN104479662A (en) | Barium-strontium scale remover for oilfield digital pressurization pry | |
| CN112029489B (en) | Formula and preparation method of low-pressure gas field old well re-production blockage removing working solution | |
| CN106566677B (en) | A kind of the cleaning dispersing agent and preparation method of the scale removal of oil field oil pipeline on-line cleaning | |
| CN113025295A (en) | Low-temperature blocking remover for oil and gas wells, preparation method and application | |
| CN114426823A (en) | Oil field insoluble scale dispersing solubilizer and preparation method thereof | |
| CN103305819B (en) | A kind of oil field tool chemical plating fluid and drilling tool corrosionproof protection method | |
| CN111500274A (en) | Organic zirconium cross-linking agent, cross-linked acid sand-carrying liquid and preparation method | |
| CN103206192B (en) | A kind of method of quick removing oil well and nearly well oil reservoir indissoluble dirt | |
| CN108624312A (en) | Ternary composite drive well scale remover and its preparation method and application process | |
| CN110630217B (en) | Chlorine dioxide oil-water well production and injection increasing process for tight oil reservoir | |
| CN115961914B (en) | One-dose multifunctional online blocking removal process suitable for thin-difference reservoir | |
| CN106010806A (en) | Multi-functional composite cleaning solution for on-line cleaning of heavy water scales of water-ring vacuum pump | |
| CN103627385B (en) | A kind of heat-resistance type Fe stabilizer applied in acidizing fluid | |
| CN107699220A (en) | Offshore oilfield well workover offensive well workover liquid system and its preparation method and application | |
| CN111423863B (en) | Enhanced temporary plugging agent capable of being used for wide and large cracks and preparation method thereof | |
| Lieu et al. | A laboratory study of chemical reactions with reservoir sand in the recovery of petroleum by alkaline flooding | |
| CN115124988B (en) | Foam drainage agent for preventing sulfur deposition | |
| Yu et al. | Preparation and performance evaluation of a highly effective barium sulfate descaling system based on ammonium carboxy chelating agent DTPA |
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 | ||
| CB02 | Change of applicant information |
Address after: 710018 2306b, Shirong international, Fengcheng 4th Road, economic and Technological Development Zone, Xi'an City, Shaanxi Province Applicant after: Shaanxi wanpulong oil and Gas Technology Service Co.,Ltd. Address before: 710018 1505, building 10, shirongjiacheng, Fengcheng 4th Road, economic and Technological Development Zone, Xi'an City, Shaanxi Province Applicant before: Shaanxi wanpulong oil and Gas Technology Service Co.,Ltd. |
|
| CB02 | Change of applicant information |