CN110439516B - Outward-discharge-free blockage and blockage removing integrated working solution and process suitable for ternary combination flooding oil well - Google Patents

Outward-discharge-free blockage and blockage removing integrated working solution and process suitable for ternary combination flooding oil well Download PDF

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CN110439516B
CN110439516B CN201910547071.6A CN201910547071A CN110439516B CN 110439516 B CN110439516 B CN 110439516B CN 201910547071 A CN201910547071 A CN 201910547071A CN 110439516 B CN110439516 B CN 110439516B
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blockage
percent
oil well
scale
oil
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CN110439516A (en
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徐超
马芮
于万吉
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DAQING QIXING PETROLEUM SCIENCE AND TECHNOLOGY Ltd
DAQING JINGSHENG WEIYE OILFIELD TECHNOLOGY SERVICE CO LTD
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DAQING JINGSHENG WEIYE OILFIELD TECHNOLOGY SERVICE CO LTD
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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
    • 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
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
    • 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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • 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
    • C09K2208/02—Spotting, i.e. using additives for releasing a stuck drill
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

The invention relates to an outward-emission-free blockage and blockage removing integrated working solution and a process suitable for a three-component combined flooding oil well. Mainly solves the problems of low medicament utilization rate, high overall cost, long construction time, discharge of reaction residual night and the like in the prior art. The method is characterized in that: the scale-removing and blocking-removing agent consists of a scale-removing and blocking-removing agent and a protective agent, and comprises the following components in percentage by weight: the scale-removing and blocking-removing agent consists of 5-7% of hydrochloric acid, 3-5% of solid nitric acid, 0.3-0.5% of alkylphenol polyoxyethylene, 1.0-2.0% of triethanolamine, 0.5-1.0% of imidazoline quaternary ammonium salt corrosion inhibitor and 90.2-84.5% of water; the protective agent consists of 3.0 to 5.0 percent of sodium hydroxide, 0.5 to 1.0 percent of disodium oxalate tetraacetate, 0.5 to 1.0 percent of nonionic demulsifier SP169 and 96.0 to 93.0 percent of water. The invention also provides an integrated process for outward-discharge-free blockage and blockage removal suitable for the ASP flooding oil well. The invention has the advantages of high efficiency of cleaning and unblocking, low cost, safety, environmental protection, etc.

Description

Outward-discharge-free blockage and blockage removing integrated working solution and process suitable for ternary combination flooding oil well
The technical field is as follows:
the invention relates to a scale-removing and blockage-removing agent system in the field of oil extraction in oil fields, in particular to a scale-removing and blockage-removing agent system suitable for ternary combination flooding, and also relates to an integrated process for removing the scale and the blockage without discharging by applying the scale-removing and blockage-removing agent system.
Background art:
mine field tests show that the ternary combination flooding can improve the recovery ratio by 20 percent compared with water flooding, and is an important successive technology for continuously developing high-water-content oil fields. Mine field tests show that the ternary combination flooding extraction end has serious scaling, oil well pump blockage is caused by scaling of underground mechanical extraction equipment, the oil well yield is greatly reduced by scaling and blocking of a blast hole and a near-wellbore area, and the chemical method for releasing the blocking and the blocking is an effective means for ensuring normal operation of the mechanical extraction well. But the residual liquid of the descaling and blockage removing reaction has strong acidity and strong corrosivity; the mineralization degree is high, the conductivity is strong, and the like, so that the oil-water separation on the ground is difficult, the electric dehydrator works abnormally, residual liquid needs to be discharged back after measures, the residual liquid treatment cost is up to 1.0 ten thousand yuan/well time, and the environmental protection risk exists. Additionally, fouled wells are often accompanied by near-well plugging while a stuck pump is present. The field test shows that the production well can obtain a certain yield increasing effect through releasing the blockage or blockage. However, because the two have differences in formula and process, the blockage removal and blockage removal are mutually independent measures, and the problems of low medicament utilization rate, high overall cost, long construction time and the like exist.
The invention content is as follows:
the invention aims to overcome the problems that the stuck removal and the blockage removal are mutually independent measures in the background technology, the medicament utilization rate is low, the overall cost is high, the construction time is long, reaction residual liquid needs to be discharged and the like, and provides an outward-discharge-free blockage removal and blockage removal integrated working solution suitable for a three-component combination flooding oil well, wherein the working solution consists of a scale removal and blockage removal agent and a protective agent, and the scale removal and blockage removal agent can effectively remove scales in underground equipment, blast holes and near-well stratums so as to increase the yield of the oil well; the protective agent is used for changing the property of residual liquid after cleaning and unblocking, and the normal separation of produced liquid in an oil-water separator is met. The invention also provides an integrated process for outward-discharge-free blockage and blockage removal suitable for the ASP flooding oil well.
The invention can solve the problems by the following technical scheme: the outward-discharge-free blockage and blockage removing integrated working solution suitable for the three-component combined flooding oil well comprises a scale-cleaning blockage removing agent and a protective agent, and the components and the proportion are as follows by weight percent: the scale-removing and blocking-removing agent consists of 5-7% of hydrochloric acid, 3-5% of solid nitric acid, 0.3-0.5% of alkylphenol polyoxyethylene ether (OP-10), 1.0-2.0% of triethanolamine, 0.5-1.0% of imidazoline quaternary ammonium salt corrosion inhibitor and 90.2-84.5% of water; the protective agent comprises 3.0-5.0% of sodium hydroxide, 0.5-1.0% of Ethylene Diamine Tetraacetic Acid (EDTA), and a nonionic demulsifier SP169 (molecular structural formula C)18H37(C3H6O)m(C2H4O)n(C3H6O)p)0.5～1.0％And 96.0-93.0% of water.
An outward discharge-free blockage and blockage removal integrated process suitable for a three-component combined flooding oil well comprises the following steps:
(1) firstly, performing hot water backwashing on a wellhead of a production well by using a pump truck, namely, discharging from a sleeve oil inlet pipe;
(2) then injecting the mixture into a 15-20 m thick sleeve gate by using a pump truck3The scale-cleaning blocking remover is put into a shaft, an oil casing valve is closed, and the oil casing valve are connected through a high-pressure pipeline to form a circulating channel;
(3) and opening an oil casing valve, starting the oil well, and recovering normal production to ensure that the descaling and blocking remover dynamically circulates in the shaft.
(4) Stopping the oil well, and injecting 5-10 m of oil from a casing gate by using a pump truck3The protective agent is put into the shaft, the oil well is started again, and normal production is recovered, so that the descaling and blocking remover and the protective agent dynamically circulate in the shaft;
(5) and finally, recovering the production flow of the oil well and starting the machine for production.
The scale-removing and blockage-removing integrated working solution suitable for the ternary combination flooding oil well adopts an interaction system of a scale-removing and blockage-removing agent and a protective agent, wherein the scale-removing and blockage-removing agent can effectively remove scales in underground equipment, a blast hole and a near-well stratum so as to increase the yield of the oil well, hydrochloric acid and solid nitric acid in the components are used as scale-dissolving agents, alkylphenol ethoxylate (OP-10) is used as a penetrating agent, triethanolamine is used as a complexing agent, and imidazoline quaternary ammonium salt corrosion inhibitor is used as a corrosion inhibitor; the protective agent is used for changing the property of residual liquid after descaling and blockage removal, and meeting the normal separation of produced liquid in an oil-water separator, and comprises the components of sodium hydroxide as a pH regulator, disodium oxalate tetraacetate as a metal ion complexing agent and a nonionic demulsifier SP169 (molecular structural formula C)18H37(C3H6O)m(C2H4O)n(C3H6O)p) As a demulsifier. The field construction adopts the process of not moving a pipe column and not discharging liquid, the scale-cleaning blocking remover and the protective agent are respectively injected into an oil well by using ground injection equipment, and then the agent forms dynamic circulation in a shaft by using oil well production equipment, so that the outward discharge-free blocking removal and removal are realizedAnd (4) integrating the card.
Compared with the background technology, the invention has the following beneficial effects: the scale-removing and blockage-relieving integrated working solution applicable to the ternary combination flooding oil well is characterized in that firstly, the component difference of scales in the oil well and scales in a blast hole and a near well zone is analyzed, the applied scale-removing and blockage-relieving agent is composed of hydrochloric acid, solid nitric acid, alkylphenol polyoxyethylene ether (OP-10), triethanolamine, imidazoline quaternary ammonium salt corrosion inhibitor and the like, has the characteristics of high scale-dissolving rate, low corrosivity on underground equipment, strong permeability, strong stripping property and the like, and can simultaneously meet the requirements of scale removal of the ternary combination flooding oil well underground equipment and blockage-relieving and yield increase of the blast hole and the near well zone. And secondly, aiming at the characteristics of strong acidity, high mineralization degree, strong conductivity and the like of the residual liquid of the scale-removing and blockage-removing reaction, the applied protective agent consists of sodium hydroxide, disodium Ethylene Diamine Tetraacetic Acid (EDTA), a non-ionic demulsifier SP169 and the like, and the acidity of the residual liquid is adjusted through neutralization reaction, Fe/Ca ions are chelated, the oil-water separation efficiency of the residual liquid is improved, so that the residual liquid of the scale-removing and blockage-removing reaction reaches the condition of no need of discharge. And thirdly, the integrated process of the ternary combination flooding oil well free from outward discharge blockage removal and blockage removal utilizes the oil casing space and production lifting power of the shaft of the oil well, so that the scale cleaning blockage removal agent and the protective agent dynamically circulate in the shaft, and the utilization rate of the agent for scale cleaning of underground equipment, blockage removal of blast holes and near-wellbore areas and production increase is ensured. The field test shows that the oil well outward-discharge-free blockage and blockage removing integrated process not only improves the running rate of the oil well, but also increases the yield of the oil well and has obvious oil increasing effect. The scale-free blockage and blockage removing integrated process is adopted in the scaling oil well, the scale-removing and blockage removing measure cost of the oil well is greatly reduced, the original blockage removing and blockage removing are mutually independent measures, the cost is respectively about 3.5 ten thousand yuan and 5.0 ten thousand yuan, the discharged residual liquid treatment cost is respectively about 1.0 ten thousand yuan, the two measures of scale removing and blockage removing are totally about 10.5 ten thousand yuan, the integrated process cost of the blockage and blockage removing without discharging is 4.5 ten thousand yuan, 6.0 ten thousand yuan can be saved, and meanwhile, the safety and environmental protection risks are greatly reduced.
Description of the drawings:
FIG. 1 is a block diagram of an integrated construction process of on-site outward-emission-free blockage and blockage removal.
The specific implementation mode is as follows:
the invention will be further illustrated with reference to specific examples:
example 1:
weighing 16g of hydrochloric acid, 3g of solid nitric acid, 0.3g of alkylphenol polyoxyethylene (OP-10), 1.0g of triethanolamine, 0.5g of imidazoline quaternary ammonium salt corrosion inhibitor and 79.2g of water to prepare the descaling and blockage removing agent; 3.0g of sodium hydroxide, 0.5g of Ethylene Diamine Tetraacetic Acid (EDTA), 0.5g of nonionic demulsifier SP169 and 96g of water are weighed to prepare the protective agent.
Example 2:
weighing 20g of hydrochloric acid, 4g of solid nitric acid, 0.4g of alkylphenol polyoxyethylene (OP-10), 1.5g of triethanolamine, 0.6g of imidazoline quaternary ammonium salt corrosion inhibitor and 73.5g of water to prepare the descaling and blockage removing agent; weighing 4.0g of sodium hydroxide, 0.8g of Ethylene Diamine Tetraacetic Acid (EDTA) and nonionic demulsifier SP169 (molecular structural formula C)18H37(C3H6O)m(C2H4O)n(C3H6O)p)0.7g of protective agent and 94.5g of water.
Example 3:
weighing 24g of hydrochloric acid, 5g of solid nitric acid, 0.5g of alkylphenol polyoxyethylene (OP-10), 2.0g of triethanolamine, 1.0g of imidazoline quaternary ammonium salt corrosion inhibitor and 67.5g of water to prepare the descaling and blockage removing agent; weighing 5.0g of sodium hydroxide, 1.0g of Ethylene Diamine Tetraacetic Acid (EDTA) and nonionic demulsifier SP169 (molecular structural formula C)18H37(C3H6O)m(C2H4O)n(C3H6O)p)1.0g and 93g of water are prepared into a protective agent.
The performance evaluation method is suitable for the outward discharge-free blockage and blockage removal integrated working solution of the three-component combination flooding oil well:
first, cleaning and unblocking agent performance
1. Scale dissolving performance
The dissolving rate of the scale sample in a mine field reaches 98 percent, and the scale cleaning effect is better. The source of the scale sample is 2-D1-P46 wells in the North Sanxi West alkali ternary combination flooding of the third oil production plant of the Daqing oilfield. The scale dissolving effect of the scale removing and blocking removing agent on the scale sample of the ternary oil well is shown in the table 1.
TABLE 1
Figure BDA0002104282040000041
2. Corrosion performance
Corrosion rate of scale-cleaning and blocking remover<1.0g/m2H, safe use. The evaluation of the corrosion performance of the scale-cleaning and blocking-removing agent is shown in Table 2.
TABLE 2
Figure BDA0002104282040000042
Second, protective agent Properties
1. Complexing Properties
After the scale removal reaction, compounds such as iron, calcium, magnesium and the like are produced, and the produced precipitate particles can cause that the ground electric dehydration can not work normally. The pH value of the residual liquid is a main factor influencing the precipitation particles, and the protective agent has stronger complexing ability on Ca, Mg and Fe ions and prevents the precipitation particles from being generated. After the residual liquid after the reaction is added with the protective agent, no precipitate exists under the condition that the pH value is more than 7.0, which indicates that the complex has stronger complexing performance. The protectant complexation assay data are shown in table 3.
TABLE 3
Name (R) pH value Precipitation conditions
Protectant + residual liquid 7.50 No precipitation
Residual liquid after reaction 4.00 With precipitation
2. Comprehensive treatment performance of residual liquid
After the scale-removing residual liquid is returned from the stratum, the pH value is about 1 generally, the corrosivity is high, and the normal operation of the electric dehydrator can be influenced due to the increase of the conductivity caused by the high mineralization degree of the residual liquid. Therefore, PH, mineralization and conductivity are important indicators for evaluating protective agents. The pH, the conductivity and the mineralization degree of the residual liquid added with the protective agent are equivalent to those of normal produced liquid, and the normal separation of oil and water cannot be influenced. The comprehensive treatment performance data of the raffinate are shown in Table 4.
TABLE 4
Figure BDA0002104282040000051
The invention is used for the integrated field effect test of the ternary combination flooding oil well without outward discharge, blockage removal and blockage removal:
an integrated field test of weak base ternary combination flooding north two west east blocks B2-341-E77 of Daqing oilfield third oil extraction plant for outward discharge-free blockage removal and blockage removal of wells comprises the following construction processes:
(1) firstly, a pump truck is adopted at the wellhead of a production well to carry out hot water backwashing, namely, the hot water is discharged from a sleeve oil inlet pipe, the water temperature is required to be 50-80 ℃, and the liquid quantity is 20m3(ii) a The construction pressure is less than or equal to 15 MPa.
(2) Then using a pump truck to inject the mixture into a 15m sleeve gate3The scale-cleaning blocking remover is put into a shaft, an oil casing valve is closed, and the oil casing valve are connected through a high-pressure pipeline to form a circulating channel;
(3) opening an oil casing valve, starting an oil well, and recovering normal production to dynamically circulate the scale-removing and blocking-removing agent in a shaft for 7 hours;
(4) stopping the oil well, and injecting 10m from the casing gate by using a pump truck3The protective agent is put into the shaft, the oil well is started again, normal production is recovered, and the descaling and blocking remover and the protective agent are dynamically circulated in the shaft for 1 h;
(5) and finally, recovering the production flow of the oil well and starting the machine for production. The schematic block diagram of the construction process of cleaning scale and releasing the scale on the spot is shown in the attached figure 1.
And (3) field test condition and effect analysis:
in 2018, in the third oil production plant of Daqing oilfield, the weak base ternary combination flooding northeast two West east blocks complete 5 wells of the integrated process field test of outward discharge-free blockage and blockage removal, and the success rate of scale removal and blockage removal is 100 percent; average daily gain 20.21m after measure3The daily oil increase is 2.51t, the pump efficiency is improved by 16.99 percent, and the effective period is 3.5 months; after 5 well measures, residual reaction liquid is not discharged back, and the ground electric dehydrator works normally. The effect of the 5-hole well in the field test of the flowback-free blockage and blockage removing integrated process in 2018 is shown in the table 5.
TABLE 5
Figure BDA0002104282040000061

Claims (4)

1. An integrated process for removing blockage and blockage of ternary combination flooding oil well without discharging, wherein the working solution adopted by the process consists of two parts, namely a descaling and blockage removing agent and a protective agent, and comprises the following steps:
(1) firstly, performing hot water backwashing on a wellhead of a production well by using a pump truck, namely, discharging from a sleeve oil inlet pipe;
(2) then injecting the mixture into a 15-20 m thick sleeve gate by using a pump truck3The scale-cleaning blocking remover is put into a shaft, an oil casing valve is closed, and the oil casing valve are connected through a high-pressure pipeline to form a circulating channel; the adopted scale-cleaning blocking remover comprises the following components in percentage by weight: consists of 5 to 7 percent of hydrochloric acid, 3 to 5 percent of solid nitric acid, 0.3 to 0.5 percent of alkylphenol polyoxyethylene, 1.0 to 2.0 percent of triethanolamine, 0.5 to 1.0 percent of imidazoline quaternary ammonium salt corrosion inhibitor and 90.2 to 84.5 percent of water;
(3) opening an oil casing valve, starting an oil well, and recovering normal production to ensure that the descaling and blocking remover dynamically circulates in a shaft;
(4) stopping the oil well, and injecting 5-10 m of oil from a casing gate by using a pump truck3The protective agent is put into the well bore, the oil well is started again, the normal production is recovered, and the scale-removing and blocking-removing agent and the protective agent dynamically circulate in the well boreA ring; the adopted protective agent comprises the following components in percentage by weight: 3.0 to 5.0 percent of sodium hydroxide, 0.5 to 1.0 percent of disodium oxalate tetraacetate, 0.5 to 1.0 percent of nonionic demulsifier SP169 and 96.0 to 93.0 percent of water
(5) And finally, recovering the production flow of the oil well and starting the machine for production.
2. The outward-emission-free blockage and blockage removing integrated process suitable for the ASP flooding oil well as defined in claim 1 is characterized in that: the temperature of the hot water in the step (1) is required to be 50-80 ℃, and the liquid quantity is 20m3(ii) a The construction pressure range is controlled to be 0-15 MPa.
3. The outward-emission-free blockage and blockage removing integrated process suitable for the ASP flooding oil well as defined in claim 1 is characterized in that: and (3) dynamically circulating the descaling and blocking remover in the shaft for 5-7 hours.
4. The outward-emission-free blockage and blockage removing integrated process suitable for the ASP flooding oil well as defined in claim 1 is characterized in that: and (4) dynamically circulating the descaling and blocking remover and the protective agent in the shaft for 1-2 hours.
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CN102775973B (en) * 2012-07-17 2014-10-29 大庆井升伟业油田技术服务有限公司 Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process
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