CN112240173A - Oil and gas well sand washing and well flushing method based on foam circulation, and defoaming solution and foaming solution for oil and gas well sand washing and well flushing - Google Patents
Oil and gas well sand washing and well flushing method based on foam circulation, and defoaming solution and foaming solution for oil and gas well sand washing and well flushing Download PDFInfo
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- CN112240173A CN112240173A CN201910650838.8A CN201910650838A CN112240173A CN 112240173 A CN112240173 A CN 112240173A CN 201910650838 A CN201910650838 A CN 201910650838A CN 112240173 A CN112240173 A CN 112240173A
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- 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
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
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- 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
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- 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
- C09K8/536—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning characterised by their form or by the form of their components, e.g. encapsulated material
Abstract
The invention relates to a sand washing and well washing method for an oil and gas well based on foam circulation, and defoaming solution and foaming solution for sand washing and well washing of the oil and gas well. The method comprises the following steps: 1) mixing the foaming liquid with nitrogen to foam to obtain a foam fluid, and performing sand washing and well washing by using the foam fluid; 2) obtaining sand-carrying foam fluid after sand washing and well flushing, adding defoaming solution into the sand-carrying foam fluid for defoaming, and separating sand grains to obtain regenerated foaming solution; the defoaming solution consists of the following components in percentage by mass: 0.4 to 2.0 percent of defoaming agent, 0.1 to 0.5 percent of auxiliary defoaming agent and the balance of water; 3) mixing the regenerated foaming liquid with nitrogen to foam to obtain foam fluid, and performing sand washing and well washing by using the foam fluid; 4) and sequentially repeating the step 2) and the step 3) until the sand washing construction is completed. The method can conveniently realize the cycle process of foaming, defoaming and re-foaming, increases the times of foam recycling, and reduces the operation cost of foam sand washing and well washing and the pollution to the environment.
Description
Technical Field
The invention belongs to the field of sand washing and well washing of a reservoir layer which is easy to leak of an oil and gas well, and particularly relates to a sand washing and well washing method of the oil and gas well based on foam circulation and defoaming liquid and foaming liquid for sand washing and well washing of the oil and gas well.
Background
The pressure of an oil-gas layer is generally reduced after years of exploitation along with the oil field development in the middle and later stages, if the conventional-density water-based sand washing liquid is adopted in the sand washing and well washing operation, a large amount of sand washing liquid is easily leaked into a stratum, the sand washing circulation of a shaft cannot be established, the sand washing construction success rate is low, and meanwhile serious stratum damage can be caused to influence the recovery of the production capacity of the oil-gas well. The foam fluid sand washing technology has the characteristics of low hydrostatic column pressure, less filter loss, good sand carrying performance, strong drainage assisting capability, small damage to stratum and the like, is successively applied to sand washing and well washing operations of oil fields such as Changqing, Xinjiang, Dagang, Shengli and Bohai sea, effectively reduces the leakage loss of sand washing liquid, establishes shaft sand washing circulation and improves the success rate of sand washing construction.
The prior foam fluid sand washing technology suitable for low-pressure oil and gas wells mainly comprises micro-bubble fluid sand washing and nitrogen foam fluid sand washing. Wherein the flow of microbubblesThe body is composed of a large number of micro bubbles with special structures, the structures and the sizes of the micro bubbles are relatively stable, sand grains are separated out in time at the outlet end of a shaft by using solid-liquid separation equipment, and micro bubble sand washing liquid can enter a well again for use. However, on the premise of ensuring good pumping performance of the micro-bubble fluid, the density of the micro-bubble fluid is generally required to be more than 0.65g/cm3This greatly limits the popularization and application of the microbubble fluid sand washing technology. Nitrogen foamed fluids are dispersions formed from charged gases, foam base fluids, and the like, having a low density lower limit (minimum densities reported in the literature are 0.03-0.04 g/cm)3) The method has the characteristics of wide adjusting range, and is widely suitable for sand washing and well washing operation of a low-pressure oil-gas well reservoir which is easy to leak. However, because of the large amount and volume of the foam, the foam pool is filled up by the foam returned from the shaft in a short time, and if a disposable method of directly abandoning the foam after defoaming is adopted, the operation cost is increased, and the environmental protection is not facilitated. The key point of the sand washing and well flushing operation technology of the low-pressure oil and gas well is the foam circulation process of realizing the foaming, defoaming and re-foaming of the nitrogen foam fluid.
The foam circulation in the field of nitrogen foam fluid sand washing is a continuous process of foam foaming, defoaming and secondary foaming, wherein foam returned from a shaft is defoamed in a physical, mechanical or chemical mode and the like, and the performance of the foam is adjusted and the foam is used for sand washing again, so that the repeated circulation of foam foaming, defoaming and secondary foaming is realized.
At present, the aims of defoaming and re-foaming are achieved by methods such as changing the pH value of a foam base liquid, adding an organic defoaming agent and the like in the nitrogen foam sand washing construction. The method for changing the pH value of the foam base liquid has selectivity on the foaming agent, is only limited to an amphoteric foaming agent, needs to repeatedly add corrosive strong acid and strong base to adjust the pH value in the circulating process, has safety risks in the transportation and construction processes, has high requirements on construction equipment and is complex in construction procedures. Although the conventional organic defoaming agent can be used for defoaming rapidly, the performance of the foaming agent is easily affected, the re-foaming capacity of the foaming agent is inhibited, and the cyclic utilization of the foam base liquid cannot be realized.
Chinese patent application with publication number CN101871330A discloses a foam recycling method for realizing foam drilling by using low-carbon alcohol, which is characterized in that one or more of n-butyl alcohol, isobutyl alcohol, n-amyl alcohol, isoamyl alcohol or neopentyl alcohol is added into foam drilling fluid and is compounded with tributyl phosphate in a volume ratio of 1:5-5:1 to be used as a defoaming agent, and after defoaming, the foam base fluid can be foamed again by stirring to realize the recycling of drilling foam. In the method, the added defoaming agent is 0.6-0.9% of the volume of the foam base liquid each time, the consumption of low-carbon alcohol is large, the hidden danger of fire and explosion is increased, the foam performance is gradually reduced along with the increase of the cycle times, and when the volume content of the low-carbon alcohol is more than 5% of the volume of the foam base liquid, the low-carbon alcohol in the system needs to be removed and a foaming agent needs to be additionally added to re-foam.
Disclosure of Invention
The invention aims to provide a sand washing and well washing method for an oil and gas well based on foam circulation, and the method is used for solving the problem that the circulation frequency of the existing foam recycling method is low.
The invention aims to provide defoaming solution for sand washing and well washing of oil and gas wells, so as to solve the problem that the conventional defoaming system is not beneficial to re-foaming when being circularly applied to the defoaming solution.
The third purpose of the invention is to provide a foaming liquid for sand washing and well washing of oil and gas wells, so as to solve the problem of poor re-foaming capability of the existing foaming liquid.
In order to achieve the purpose, the sand washing and well washing method for the oil and gas well based on the foam circulation adopts the technical scheme that:
a sand washing and well washing method for an oil and gas well based on foam circulation comprises the following steps:
1) mixing the foaming liquid with nitrogen to foam to obtain a foam fluid, and performing sand washing and well washing by using the foam fluid;
2) obtaining sand-carrying foam fluid after sand washing and well flushing, adding defoaming solution into the sand-carrying foam fluid for defoaming, and separating sand grains to obtain regenerated foaming solution; the defoaming solution consists of the following components in percentage by mass: 0.4 to 2.0 percent of defoaming agent, 0.1 to 0.5 percent of auxiliary defoaming agent and the balance of water; the defoaming agent consists of low-carbon alcohol and polyglycerol ether; the carbon atom number of the low-carbon alcohol is not more than 10, and the auxiliary antifoaming agent is diethyl hexanol and/or diisobutyl carbinol;
3) mixing the regenerated foaming liquid with nitrogen to foam to obtain foam fluid, and performing sand washing and well washing by using the foam fluid;
4) and sequentially repeating the step 2) and the step 3) until the sand washing construction is completed.
According to the sand washing and well washing method for the oil and gas well based on the foam circulation, the low carbon alcohol and the polypropylene glycol ether have the characteristics of strong defoaming property and weak foam inhibition property, a small amount of defoaming solution is added into a foamed foam system, and the defoaming solution is quickly spread on the surface of foam and is in contact with a bubble liquid film, so that the local surface tension of the foam is reduced, the foam is quickly broken, and the defoaming effect is achieved; in the solubility range, the low-carbon alcohol and the polypropylene glycol ether which play a defoaming role on the foam surface quickly sink and dissolve in the foam base liquid after defoaming, play a foam stabilizing role in enhancing the surface viscosity and improving the strength of a foam liquid film and lose the defoaming role; the low-carbon alcohol and the polypropylene glycol ether can generate a synergistic interaction effect through compounding, so that the foam inhibition performance is further reduced, the foam stabilizing effect is enhanced, and the cyclic utilization of foam is realized. The auxiliary defoaming agent plays a role in adjusting the solubility, the crystallinity and the spreading of the defoaming agent in a foaming medium and improving the surface effect of the defoaming agent. The result shows that the method can conveniently realize the cycle process of foaming, defoaming and secondary foaming, only a small amount of defoaming solution is needed to be used in the cycle process to realize quick defoaming, the defoamed foam can be re-foamed through mechanical stirring, and the foaming volume is higher than the first foaming volume, so that the use efficiency of the foaming solution is improved, the foam recycling times are obviously increased, and the foam sand washing and well washing operation cost and the pollution to the environment are reduced.
In order to further improve the compounding effect of the low-carbon alcohol and the polypropylene glycol ether, further reduce the foam inhibition property and enhance the foam stabilizing effect, preferably, in the step 2), the mass ratio of the low-carbon alcohol to the polypropylene glycol ether is 8 (1-2).
In order to further optimize the strong defoaming and weak foam inhibiting capability of the low-carbon alcohol and improve the synergistic effect with the polypropylene glycol ether, preferably, the low-carbon alcohol is propanol and/or isooctanol.
From the aspect of considering both the quick defoaming capability of the defoaming solution and not affecting the re-foaming capability of the foam base solution, preferably, in the step 2), the addition volume of the defoaming solution is 0.02 to 0.05 percent of the volume of the foam generated in the mixing and foaming process in the step 1).
The foaming liquid can be a conventional foaming system adopted in the field of sand washing by using nitrogen foam fluid, and in order to further improve the circulating foaming capacity of the foaming liquid after the defoaming liquid is added, preferably, in the step 1), the foaming liquid consists of the following components in percentage by mass: a composite foaming agent: 0.2-1.0%, foam stabilizer: 0.1-0.5%, and the balance of water; the composite foaming agent consists of a zwitterionic foaming agent and an anionic foaming agent; the amphoteric ion foaming agent is hydroxypropyl phosphate betaine and/or hydroxyethyl betaine, the anionic foaming agent is at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate, and the foam stabilizer is hydroxypropyl guanidine gum and/or polyacrylamide.
The foaming liquid, the betaine amphoteric ion foaming agent and the anion foaming agent are selected to play a synergistic role, so that the micelle forming capability is enhanced, the surface tension is reduced, and the strength of a surface adsorption film is increased to improve the stability of foam. The foam stabilizer belongs to a tackifying stabilizer, and plays roles of improving liquid phase viscosity, reducing fluidity and the like in a foaming process to slow down the liquid discharge speed of foam and improve the stability of the foam. Experimental results show that the foaming liquid has excellent circulating foaming capacity, the foam has moderate stability, and the foaming liquid also has excellent sand carrying capacity in the sand washing and well washing process.
In order to further enhance the compounding effect of the betaine zwitterionic foaming agent and the anionic foaming agent and further enhance the circulating foaming capacity of the betaine zwitterionic foaming agent and the anionic foaming agent, the preferable mass ratio of the zwitterionic foaming agent to the anionic foaming agent is 1 (1-2).
The betaine zwitterionic foaming agent generally contains hydrophilic groups such as hydroxypropyl, phosphate, hydroxyethyl or carboxyl, and the like, so as to further enhance the hydrophilicity and the solubilization of the betaine zwitterionic foaming agent, further optimize the compatibility with the anionic foaming agent and enhance the foamingFoaming capacity, preferably, the hydroxypropyl phosphate betaine has the formula: cxH2x+1N(CH3)2CH2CH(OH)CH2HPO4Wherein x is 12, 14, 16 or 18; the molecular formula of the hydroxyethyl betaine is as follows: cyH2y+1N(CH2CH2OH)2CH2COO, wherein y is 12, 14, 16 or 18.
The defoaming solution for sand washing and well washing of oil and gas wells adopts the technical scheme that:
the defoaming solution for sand washing and well washing of the oil and gas well comprises the following components in percentage by mass: 0.4 to 2.0 percent of defoaming agent, 0.1 to 0.5 percent of auxiliary defoaming agent and the balance of water; the defoaming agent consists of low-carbon alcohol and polyglycerol ether; the carbon atom number of the low-carbon alcohol is not more than 10, and the auxiliary antifoaming agent is diethyl hexanol and/or diisobutyl carbinol.
According to the defoaming solution for sand washing and well washing of the oil and gas well, the low-carbon alcohol and the polypropylene glycol ether can generate a synergistic interaction effect through compounding, so that the foam inhibition performance is further reduced, and the foam stabilizing effect is enhanced; the auxiliary defoaming agent has the functions of adjusting the solubility, the crystallinity and the spreading of the defoaming agent in a foaming medium and improving the surface effect of the defoaming agent; when the components are used together in a foaming system, the quick defoaming can be realized, the influence on the re-foaming capacity of the foaming system is small, the stability of the foam is proper, and the foam can be conveniently and efficiently applied to the foam circulating sand washing well washing operation.
In order to further improve the compounding effect of the low-carbon alcohol and the polypropylene glycol ether, further reduce the foam inhibition property and enhance the foam stabilizing effect, the preferred mass ratio of the low-carbon alcohol to the polypropylene glycol ether is 8 (1-2).
The technical scheme adopted by the foaming liquid for sand washing and well washing of the oil and gas well is as follows:
a foaming liquid for sand washing and well washing of oil and gas wells comprises the following components in percentage by mass: a composite foaming agent: 0.2-1.0%, foam stabilizer: 0.1-0.5%, and the balance of water; the composite foaming agent consists of a zwitterionic foaming agent and an anionic foaming agent; the amphoteric ion foaming agent is hydroxypropyl phosphate betaine and/or hydroxyethyl betaine, the anionic foaming agent is at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate, and the foam stabilizer is hydroxypropyl guanidine gum and/or polyacrylamide.
The foaming liquid for sand washing and well washing of oil and gas wells provided by the invention has excellent circular foaming capacity, and the foam has moderate stability, and shows excellent sand carrying capacity in the sand washing and well washing process.
In order to further enhance the compounding effect of the betaine zwitterionic foaming agent and the anionic foaming agent and further enhance the circulating foaming capacity of the betaine zwitterionic foaming agent and the anionic foaming agent, the preferable mass ratio of the zwitterionic foaming agent to the anionic foaming agent is 1 (1-2). The number average molecular weight of the polyacrylamide can be selected from 1300-1500 ten thousand to further enhance the foam stability gain effect when the polyacrylamide is compounded with the foaming agent.
Drawings
FIG. 1 is a schematic structural diagram of a foam circulation device related to an embodiment of a sand washing and well flushing method for an oil and gas well based on foam circulation, disclosed by the invention;
FIG. 2 is a schematic diagram of the simulated wellbore string of FIG. 1;
in the figure, 1-simulated shaft pipe column, 2-sand washing pipe column, 3-outer pipe column, 4-sand adding port, 5-liquid outlet, 6-defoaming pool, 7-spray head, 8-defoaming liquid pool, 9-valve, 10-booster pump, 11-sand setting baffle, 12-sand discharging port, 13-buffer pool, 14-base liquid pool, 15-foam generator, 16-high pressure nitrogen gas bottle, 17-liquid metering pump, 18-orifice plate flowmeter, 19-foam sampler, 20-sand outlet, 21-gas flowmeter and 22-pressure gauge.
Detailed Description
In the following examples, a foam circulation device as shown in fig. 1-2 was used to perform indoor simulated sand-wash well-flushing experiments.
The foam circulation device comprises a simulation shaft pipe column 1, the simulation shaft pipe column 1 comprises a sand washing pipe column 2 and an outer pipe column 3 which are arranged in an inner and outer sleeving mode, the upper end and the lower end of the outer pipe column 3 are correspondingly provided with upper end covers, the lower end cover is fixed at the upper end of the sand washing pipe column 2, the lower end of the sand washing pipe column 2 is higher than the lower end cover, an annular space between the outer wall of the sand washing pipe column 2 and the inner side wall of the outer pipe column 3 and a cylindrical space between the lower end of the sand washing pipe column 2 and the lower end cover form a sand washing operation cavity, an injection port for injecting foam fluid into the sand washing pipe column 2 is formed in the upper end cover, a sand adding port 4 and a liquid outlet 5 are formed in the outer pipe column 3.
Liquid outlet 5 links to each other with defoaming pond 6's inlet, and defoaming pond 6's upper end is provided with shower head 7, and shower head 7 links to each other with defoaming liquid pond 8, is provided with valve 9 and booster pump 10 on the connecting line of the two. Be provided with sand setting baffle 11 in defoaming pond 6, the one end of sand setting baffle 11 sets up in the middle part of defoaming pond inside wall, and other end slant downwardly extending is to the interior diapire of defoaming pond 6, still is provided with sand discharge port 12 and leakage fluid dram on the defoaming pond 6, and the leakage fluid dram of defoaming pond 6 links to each other with the inlet of buffer pool 13, and the leakage fluid dram of buffer pool 13 links to each other with the liquid mouth that returns of base liquid pool 14.
The transfusion port of the base liquid pool 14 is connected with the inlet of the foam generator 15, the inlet of the foam generator 15 is also connected with a high-pressure nitrogen cylinder 16 in parallel, the outlet of the foam generator 15 is connected with the injection port on the upper end cover, and a valve and a pressure gauge 22 are arranged on the connecting pipeline of the foam generator 15 and the injection port of the upper end cover. A liquid metering pump 17 and an orifice flowmeter 18 are further arranged on a connecting pipeline between the base liquid pool 14 and the foam generator 15, a sampling pipeline is further connected to a connecting pipeline between an infusion port of the base liquid pool 14 and the liquid metering pump 17, and a foam sampler 19 is arranged on the sampling pipeline. A valve and a gas flowmeter 21 are arranged on a connecting pipeline of the high-pressure nitrogen gas cylinder 16 and the foam generator 15.
When the simulated sand washing well-flushing operation is carried out, foaming liquid and nitrogen are mixed and foamed in the foam generator 15, then the foaming liquid enters the sand washing pipe column 2 through the injection port, then the foaming liquid enters the sand washing operation cavity through the lower end opening of the sand washing pipe column 2, sand grains filled in through the sand adding port 4 are carried, and sand-carrying foam returning from the liquid outlet 5 on the outer pipe column 3 enters the defoaming pool 6. An appropriate amount of defoaming solution is prepared in a defoaming solution pool 8 in advance, the defoaming solution is uniformly sprayed on foam through a spray head 7 to realize defoaming, after sand separation is realized through sand setting, regenerated foaming solution is obtained, the regenerated foaming solution enters a buffer pool 13 and then flows back to a base solution pool 14 to serve as foam base solution for next cycle foaming, and the foam base solution is mixed with high-pressure nitrogen again and enters a foam generator 15 to be foamed again, so that the purpose of foam recycling is realized.
The sand adopted in the indoor simulation sand washing well-flushing experiment has the density of 1.74g/cm3425 and 850 mu m of ceramsite. During the experiment, firstly, ceramsite is added, and then foam fluid is introduced, wherein the volume ratio of the ceramsite to the foam fluid is 1: (9-19).
The following further describes embodiments of the present invention with reference to the drawings.
In embodiment 1 of the sand washing and well washing method for the oil and gas well based on the foam circulation, the foam circulation device is utilized, and the following steps are adopted:
1) mixing the foaming liquid with nitrogen to foam to obtain foam fluid, and performing sand washing and well washing by using the foam fluid.
The foaming liquid consists of the following components in percentage by mass: hydroxypropyl phosphate betaine (C)12H25N(CH3)2CH2CH(OH)CH2HPO4)0.25 percent of fatty alcohol-polyoxyethylene ether sodium sulfate, 0.25 percent of hydroxypropyl guar gum and the balance of water. When preparing foaming liquid, firstly adding hydroxypropyl guar gum into water, stirring at 800r/min, then adding hydroxypropyl phosphate betaine and fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring uniformly at 300r/min to obtain the foaming liquid. When the mixture is foamed, the volume ratio of the foaming liquid to the nitrogen is 1: 9.
2) And (3) obtaining sand-carrying foam fluid after sand washing and well washing, adding defoaming solution into the sand-carrying foam fluid for defoaming, and separating sand grains to obtain regenerated foaming solution.
The defoaming solution comprises the following components in percentage by mass: isooctanol 1.6%, polypropylene glycol ether (GPE-3000) 0.4%, diethyl hexanol 0.5%, and the balance of water. When preparing the defoaming solution, adding isooctanol, polypropylene glycol ether (GPE-3000) and diethyl hexanol into water in turn, and stirring uniformly at 300 r/min. The addition volume of the defoaming solution was 0.04% of the volume of foam generated by mixing and foaming.
3) Mixing the regenerated foaming liquid with nitrogen to foam to obtain foam fluid, and performing sand washing and well washing by using the foam fluid.
4) And sequentially repeating the step 2) and the step 3) until the sand washing construction is completed.
To facilitate observation and monitoring of foam performance after each cycle of defoaming, the foam base fluid was taken after each defoaming and tested for foam quality and half-life by the Waring Blender method, the results of which are shown in table 1.
Table 1 oil and gas well sand flushing method cycle test results for foam base fluid of example 1
From the experimental results in table 1, the foam base fluid is subjected to 12 cycles, the foaming volume is increased and then reduced, but the foaming volume is higher than the first foaming volume, the half-life period is slightly reduced, and the ceramsite can be taken out in each cycle. By adding a small amount of defoaming solution, the foaming solution is not required to be added, and the sand washing and well washing for 14 times of foaming can be recycled.
The embodiment 2 of the sand washing and well washing method for the oil and gas well based on the foam circulation is basically the same as the embodiment 1 of the sand washing and well washing method for the oil and gas well, and is different in that in the step 1), a foaming liquid consists of the following components in percentage by mass: hydroxyethyl betaine (C)18H37N(CH2CH2OH)2CH2COO) 0.5%, sodium dodecyl sulfate 0.5%, polyacrylamide (number average molecular weight 1300-. In the step 2), the defoaming solution consists of the following components in percentage by mass: 0.35% of propanol, 0.05% of polypropylene glycol ether (GPE-3000), 0.1% of diisobutyl carbinol and the balance of water; the addition volume of the defoaming solution was 0.05% of the volume of foam generated by mixing and foaming.
The performance of the foam base fluid was tested in the same evaluation manner as in example 1 of the sand-wash well-wash method for oil and gas wells, and the results are shown in table 2.
Table 2 oil and gas well sand washing well method example 2 foam base fluid circulation test results
From the experimental results in table 2, it can be seen that the foam base fluid has a foam volume increasing and then decreasing after 12 cycles, but the foam volume is higher than the first foam volume, the half-life period is slightly decreased, and the ceramsite can be taken out during each cycle. By adding a small amount of defoaming solution, the foaming solution is not required to be added, and the sand washing and well washing for 15 times of foaming can be recycled.
Examples 3 to 8 of the sand-washing and well-flushing method for an oil and gas well based on foam circulation of the present invention are basically the same as the embodiment 1 of the sand-washing and well-flushing method for an oil and gas well, except that the formulation composition of the foaming liquid is different, as shown in table 3 specifically; the formulation composition of the defoaming solution was varied and is specifically shown in table 4.
TABLE 3 Sand washout method for oil and gas wells foaming fluid formulations of examples 3-8
TABLE 4 defoaming solution formulation for sand-washing and well-flushing method of oil and gas well in examples 3 to 8
The performance of the foam base fluid is tested in the same evaluation mode as in example 1 of the sand washing and well washing method for oil and gas wells, and the specific test result is equivalent to that in table 1.
Comparative example 1
The oil and gas well sand washing and well washing method of the comparative example 1 uses the same foaming liquid as the oil and gas well sand washing and well washing method in example 1, the defoaming liquid is formed by compounding n-butyl alcohol and tributyl phosphate according to the volume ratio of 1:5, the volume addition amount of the defoaming liquid is 3.6% of the volume of the foam base liquid, then the performance of the foam base liquid is evaluated according to the same evaluation mode, and the results are shown in table 5.
TABLE 5 results of cycle experiments for the foam base fluid of comparative example 1
From the results in table 5, it can be seen that after 8 cycles, the foaming volume and half-life period are significantly reduced, and the foaming liquid is not required to be supplemented in the first 8 cycles; at the 9 th circulation, n-butanol is removed, and a small amount of foaming liquid (5%) is added to restore the foaming capacity and foaming performance of the foam base liquid.
Comparative example 2
The oil and gas well sand washing and well washing method of the comparative example 2 uses the same foaming liquid as the oil and gas well sand washing and well washing method of example 2, the defoaming liquid is formed by compounding n-butyl alcohol and tributyl phosphate according to the volume ratio of 5:1, the volume addition amount of the defoaming liquid is 1.08% of the volume of the foam base liquid, then the performance of the foam base liquid is evaluated according to the same evaluation mode, and the results are shown in table 6.
Table 6 results of cycle test of the foam base fluid of comparative example 2
From the results in table 6, it can be seen that after 9 cycles, the foaming volume and half-life period are significantly reduced, and the foaming liquid is not required to be supplemented in the first 9 cycles; at the 10 th circulation, the n-butanol is removed, and a small amount of foaming liquid (5%) is added to restore the foaming capacity and foaming performance of the foam base liquid.
Examples 1 to 8 of the defoaming solution for sand washing and well washing of oil and gas wells of the present invention are defoaming solutions related to step 2) in the above oil and gas well sand washing and well washing methods in examples 1 to 8, respectively.
Examples 1 to 8 of the foaming liquid for sand washing and well washing of oil and gas wells of the present invention are the foaming liquids related to step 1) in the above oil and gas well sand washing and well washing method examples 1 to 8, respectively.
Claims (10)
1. A sand washing and well washing method for an oil and gas well based on foam circulation is characterized by comprising the following steps:
1) mixing the foaming liquid with nitrogen to foam to obtain a foam fluid, and performing sand washing and well washing by using the foam fluid;
2) obtaining sand-carrying foam fluid after sand washing and well flushing, adding defoaming solution into the sand-carrying foam fluid for defoaming, and separating sand grains to obtain regenerated foaming solution; the defoaming solution consists of the following components in percentage by mass: 0.4 to 2.0 percent of defoaming agent, 0.1 to 0.5 percent of auxiliary defoaming agent and the balance of water; the defoaming agent consists of low-carbon alcohol and polyglycerol ether; the carbon atom number of the low-carbon alcohol is not more than 10, and the auxiliary antifoaming agent is diethyl hexanol and/or diisobutyl carbinol;
3) mixing the regenerated foaming liquid with nitrogen to foam to obtain foam fluid, and performing sand washing and well washing by using the foam fluid;
4) and sequentially repeating the step 2) and the step 3) until the sand washing construction is completed.
2. The sand washing and well flushing method for the oil and gas well based on the foam circulation as claimed in claim 1, wherein in the step 2), the mass ratio of the low carbon alcohol to the polypropylene glycol ether is 8 (1-2).
3. The foam cycle based sand flushing and well flushing method for oil and gas wells according to claim 2, wherein in step 2), the lower alcohol is propanol and/or isooctanol.
4. The foam cycle based sand flushing and well flushing method for oil and gas wells according to any one of claims 1 to 3, characterized in that in step 2), the defoaming solution is added in a volume of 0.02 to 0.05% of the volume of the foam generated in the mixed foaming process of step 1).
5. The sand flushing and well flushing method for the oil and gas well based on the foam circulation as claimed in claim 1, wherein in the step 1), the foaming liquid consists of the following components in percentage by mass: a composite foaming agent: 0.2-1.0%, foam stabilizer: 0.1-0.5%, and the balance of water; the composite foaming agent consists of a zwitterionic foaming agent and an anionic foaming agent; the amphoteric ion foaming agent is hydroxypropyl phosphate betaine and/or hydroxyethyl betaine, the anionic foaming agent is at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate, and the foam stabilizer is hydroxypropyl guanidine gum and/or polyacrylamide.
6. The foam cycle based sand flushing method for oil and gas wells as claimed in claim 5, wherein the mass ratio of the zwitterionic foaming agent to the anionic foaming agent is 1 (1-2).
7. The defoaming solution for sand washing and well washing of the oil and gas well is characterized by comprising the following components in percentage by mass: 0.4 to 2.0 percent of defoaming agent, 0.1 to 0.5 percent of auxiliary defoaming agent and the balance of water; the defoaming agent consists of low-carbon alcohol and polyglycerol ether; the carbon atom number of the low-carbon alcohol is not more than 10, and the auxiliary antifoaming agent is diethyl hexanol and/or diisobutyl carbinol.
8. The defoaming solution for sand washing and well washing of oil and gas wells according to claim 7, wherein the mass ratio of the low-carbon alcohol to the polypropylene glycol ether is 8 (1-2).
9. The foaming liquid for sand washing and well washing of the oil and gas well is characterized by comprising the following components in percentage by mass: a composite foaming agent: 0.2-1.0%, foam stabilizer: 0.1-0.5%, and the balance of water; the composite foaming agent consists of a zwitterionic foaming agent and an anionic foaming agent; the amphoteric ion foaming agent is hydroxypropyl phosphate betaine and/or hydroxyethyl betaine, the anionic foaming agent is at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate, and the foam stabilizer is hydroxypropyl guanidine gum and/or polyacrylamide.
10. The foaming fluid for sand washing and well washing of oil and gas wells as claimed in claim 9, wherein the mass ratio of the zwitterionic foaming agent to the anionic foaming agent is 1 (1-2).
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| CN113004878A (en) * | 2021-03-23 | 2021-06-22 | 四川省贝特石油技术有限公司 | Leakage-proof leakage-stopping type micro-foam drilling and repairing liquid as well as preparation method and application thereof |
| CN113389525A (en) * | 2021-07-30 | 2021-09-14 | 中国石油化工股份有限公司 | Shale gas well foam exhausting-gas lifting composite process design method and process flow thereof |
| CN113484192A (en) * | 2021-09-06 | 2021-10-08 | 广汉市福客科技有限公司 | Evaluation device and evaluation method of sinking type delayed foaming agent |
| CN115725287A (en) * | 2022-11-25 | 2023-03-03 | 克拉玛依新科澳石油天然气技术股份有限公司 | Temperature-resistant salt-resistant nitrogen foam sand washing liquid and preparation and use methods thereof |
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| CN112175597A (en) * | 2020-09-17 | 2021-01-05 | 周刊 | Well-flushing foam water shutoff agent and preparation method thereof |
| CN113004878A (en) * | 2021-03-23 | 2021-06-22 | 四川省贝特石油技术有限公司 | Leakage-proof leakage-stopping type micro-foam drilling and repairing liquid as well as preparation method and application thereof |
| CN113389525A (en) * | 2021-07-30 | 2021-09-14 | 中国石油化工股份有限公司 | Shale gas well foam exhausting-gas lifting composite process design method and process flow thereof |
| CN113484192A (en) * | 2021-09-06 | 2021-10-08 | 广汉市福客科技有限公司 | Evaluation device and evaluation method of sinking type delayed foaming agent |
| CN115926767A (en) * | 2022-11-15 | 2023-04-07 | 中国石油天然气集团有限公司 | High-temperature and high-pressure resistant foam sand washing liquid and preparation method and application thereof |
| CN115725287A (en) * | 2022-11-25 | 2023-03-03 | 克拉玛依新科澳石油天然气技术股份有限公司 | Temperature-resistant salt-resistant nitrogen foam sand washing liquid and preparation and use methods thereof |
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