CN105255466A - Slow blockage removing agent for oil well and blockage removing method - Google Patents
Slow blockage removing agent for oil well and blockage removing method Download PDFInfo
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- CN105255466A CN105255466A CN201510713949.0A CN201510713949A CN105255466A CN 105255466 A CN105255466 A CN 105255466A CN 201510713949 A CN201510713949 A CN 201510713949A CN 105255466 A CN105255466 A CN 105255466A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- 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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- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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Abstract
The invention discloses a slow blockage removing agent for an oil well and a blockage removing method, and belongs to the technical field of oil field exploitation. The slow blockage removing agent is prepared from prepad fluid, main fluid and post-pad fluid, the prepad fluid and the post-pad fluid both take hydrochloric acid as the main component of acid fluid for removing inorganic scale precipitation and dissolving reaction residues, and the main fluid takes glacial acetic acid and fluoboric acid as the main components of acid fluid for stabilizing clay mineral of a reservoir stratum, decreasomg the acid rock reaction speed, enlarging the blockage removing radius and increasing the blockage removing depth. For a fracturing production horizontal well, the treatment fluid is injected into the reservoir stratum in the former stage, the intermediate stage and the later stage, and liquid nitrogen is simultaneously injected, so that residual reaction fluid can be quickly drained after blockage removing construction is performed; pollution blockage near a well bore of the oil well can be effectively removed, the effective permeability near the well bore is increased, the individual-well producing rate is increased, damage caused by excessive acid corrosion to the rock framework of the reservoir stratum can be avoided, and therefore the reservoir stratum can be prevented from being subjected to secondary damage.
Description
Technical field
The present invention relates to a kind of unblocking agent, being specifically related to the slow unblocking agent for removing adjacent to oil well area blocking, also relating to a kind of de-plugging of well method simultaneously, belonging to oilfield exploitation technical field.
Background technology
In drilling process, drilling fluid and reservoir generation Long contact time can cause injury in various degree to reservoir, especially for the horizontal well adopting fracturing production, a large amount of fracturing liquid injects stratum and certainly will have a negative impact to reservoir, these outside fluids can cause permeability to oil to reduce to the injury of reservoir, and Clay Mineral expands, and occurs fine migration, precipitation etc., the effective seepage channel of blocking reservoir, makes per-well production decline.The patent of invention of publication No. CN103740353A discloses a kind of composite blockage relieving agent, comprise pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid, pre-process liquid is by acetic acid, hydrochloric acid, hydrofluoric acid, Repone K, ammonium persulphate, ethylenediamine tetraacetic acid (EDTA), butynediol, alkylphenol polyoxyethylene, propylene glycol monomethyl ether and water composition, main treatment solution is by acetic acid, hydrochloric acid, hydrofluoric acid, Repone K, ammonium persulphate, both sexes fluorocarbon surfactant and water composition, this unblocking agent can be removed by conventional colloid, the blocking that bituminous matter and inorganic solid phase particle cause, retardative property is good, can also prevent precipitation of iron ions and acid sludge from generating, efficient solution is except the blocking of horizontal well immediate vicinity of wellbore, recover oil well productivity, improve oil recovery factor.But the corrodibility of hydrochloric acid and hydrofluoric acid is comparatively strong, and acid-rock reaction excessive velocities when being acid solution main body with the two, easily damages reservoir rock skeleton, cause secondary injury, be unfavorable for increasing unblocking agent depth of interaction, de-plugging is range limited simultaneously.
Summary of the invention
The object of this invention is to provide a kind of unblocking agent that effectively can slow down acid-rock reaction speed.
Meanwhile, the present invention also provides a kind of de-plugging of well method.
In order to realize above object, the technical solution adopted in the present invention is:
The slow unblocking agent of oil well, is made up of according to volume ratio 40 ~ 55:125 ~ 175:40 ~ 55 spearhead, main body liquid, subsequent fluid; Spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, and inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, surplus is water.
Preferably, in slow unblocking agent, spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, inhibiter 0.5%, butyl glycol ether 0.5%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, and inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water.
The agent of described Xie Shui lock is AS-3, AS-3 is a kind of tensio-active agent, and trade name: AS-3 water blocking damage treating agent, numbering: 1003, the added date: on August 10th, 2011, purchased from Dongying City Ao Sheng Chemical Co., Ltd..AS-3 can effectively reduce rock surface tension force and oil water interfacial tension, and reduction capillary resistance and working fluid return row pressure power, improves permeability to oil.
Described inhibiter is SJ-21, SJ-21 is a kind of quaternary ammonium salt, trade name: SJ-21 normal temperature acidification corrosion inhibitor, numbering: 2005, purchased from Shengli Oil Field circumference Chemical Co., Ltd..SJ-21 can effectively prevent unblocking agent to the corrosion of preparation of construction and metal pipe line.
In each section for the treatment of solution and treatment solution, component effect is summarized as follows:
In spearhead, hydrochloric acid is mainly used in removing inorganic scale precipitation, and formation carries out pre-treatment.
In main body liquid, fluoroboric acid can stablize clay and formation fines, destroys clay mineral cation exchange capacity (CEC), particulate and ma is linked together.And fluoroboric acid is a kind of potential acid of producing hydrofluoric acid, can be hydrolyzed in water and produces hydrofluoric acid.By acetic acid and fluoroboric acid composite; acid-rock reaction speed can be slowed down; avoid acid-soluble erosion excessively to damage reservoir rock skeleton, solve the problem because acid-rock reaction excessive velocities causes EFFECTIVE RANGE to reduce, while protection reservoir, reach the object of removing clog in deep reservoir.
In subsequent fluid, the reaction that hydrochloric acid is mainly used in dissolving preposition unblocking agent and main body unblocking agent remains, and thoroughly removes immediate vicinity of wellbore blocking.
First the present invention carries out pre-treatment to dissolve in oil reservoir carbonate cementing matter and part is calcareous, aluminium matter etc. with spearhead to reservoir, and after avoiding main body liquid to enter reservoir, reaction produces insolubles and causes new blocking; Main body liquid is mainly used in removing reservoir blocking, improves reservoir permeability; Subsequent fluid is for dissolving issuable a small amount of reaction residues etc. after main humoral effect.Arrange in pairs or groups in each section for the treatment of solution use ammonium chloride, citric acid, AS-3, SJ-21 and butyl glycol ether single dose each other, and and mineral acid between all there is good compatibleness, after mixing, each component can also play between component and act synergistically while giving full play to each self-applying, de-plugging above, improves reservoir permeability.
Citric acid is a kind of Fe stabilizer, can play the effect of stable iron ion, can play again the effect of corrosion rock, and due to citric acid multiple ionization, it can slow down acid-rock reaction speed, increases de-plugging EFFECTIVE RANGE.
Ammonium chloride is a kind of clay stabilizer, for suppressing clay swelling.
Butyl glycol ether is a kind of breakdown of emulsion mutual solvent, there is anti-newborn demulsification, it can reduce tensio-active agent at crude oil interface, the absorption on sour interface and rock particles surface, the liquid pearl in acidization is made to be easy to merge, eliminate the blocking of emulsification of crude oil thing, recover reservoir rock surface hydrophilicity, improve permeability to oil.
De-plugging of well method, comprises the following steps: in horizontal well, inject slow unblocking agent (injecting spearhead, main body liquid and subsequent fluid successively), companion's fluid injection nitrogen, closing well after active water replaces.
Preferably, spearhead, main body liquid, subsequent fluid all inject just to squeeze mode, and the injection discharge capacity of spearhead, subsequent fluid is respectively 0.5 ~ 0.8m
3/ min, the injection discharge capacity of main body liquid is 1 ~ 1.5m
3/ min, the injection discharge capacity of liquid nitrogen is 0.1 ~ 0.2m
3/ min.Inject the stage at spearhead, adopt 0.5 ~ 0.8m
3the small displacement injection of/min is beneficial to spearhead and carries out abundant pre-treatment to reservoir, and main body liquid injection discharge capacity is greater than spearhead injection discharge capacity raising main body liquid injection pressure, increases the de-plugging degree of depth.
Before injecting unblocking agent, need first to trip out flow string in well, under enter sand-flushing pipe column and carry out sand washing operation, trip out sand-flushing pipe column after the sand washing end of job, under enter tieback string, after tieback is qualified, well head is installed, pressure testing is carried out to oil jacket annular space, connect surface pipeline, carry out pressure testing to well head and surface pipeline, pressure testing is qualified can inject unblocking agent.
The time of described closing well is 10 ~ 20 hours, and drive a well after reaction pressure release, and with active water well-flushing (washing out raffinate in pit shaft), trips out de-plugging operating tool string in down-hole after well-flushing.Active water is the solution (concentration about 1%) adding Repone K, ammonium chloride or other clay stabilizers that this area is commonly used.
Beneficial effect of the present invention:
In the present invention, slow unblocking agent is made up of spearhead, main body liquid and subsequent fluid, spearhead, subsequent fluid are all using hydrochloric acid as acid solution principal constituent, in order to remove inorganic scale precipitation and solubilizing reaction residual, main body liquid is using acetic acid and fluoroboric acid as acid solution principal constituent, in order to stable Clay Mineral, slow down acid-rock reaction speed, expand plug removal radius, increase the de-plugging degree of depth.For fracturing production horizontal well; after in before point, above-mentioned each section for the treatment of solution is injected reservoir by three phases; and accompany fluid injection nitrogen; the reaction residue row of returning fast after de-plugging can be made to construct; efficient solution can not only remove adjacent to oil well area contamination and plugging, increase nearly well band effective permeability, improve per-well production; acid-soluble erosion can also be avoided excessively to damage reservoir rock skeleton, and protection reservoir exempts from secondary injury.
For fracturing production horizontal well, in de-plugging process, add sand washing operation energy efficient solution except physical clogging in pit shaft, then divide three phases to inject each section for the treatment of solution with different displacements, stepwise disposal, finally can reach and remove reservoir blocking, dredging Reservoir Seepage passage, improve the object of per-well production.Inject omnidistance companion's fluid injection nitrogen at unblocking agent, be conducive to the reaction residue row of returning smoothly after breaking block treatment.
Embodiment
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
Embodiment 1
In the present embodiment oil well with slow unblocking agent by spearhead, main body liquid, subsequent fluid according to volume 50m
3, 150m
3and 50m
3composition; Spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 0.8%, citric acid 0.6%, AS-30.4%, SJ-210.6%, butyl glycol ether 0.4%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 1.2%, and citric acid 0.4%, Xie Shui locks agent 0.6%, and inhibiter 0.4%, butyl glycol ether 0.6%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
De-plugging of well method, comprises the following steps:
1) for HH37P15 well, first trip out flow string in well, under enter sand-flushing pipe column and carry out sand washing operation, trip out sand-flushing pipe column after the sand washing end of job, under enter tieback string and be incorporated into 1939.56m, after tieback is qualified, 350 type well heads are installed, to oil jacket annulus test to 5MPa, it is qualified that pressure drop in 10 minutes is less than 0.5MPa, connect surface pipeline, pressure testing is carried out to well head and surface pipeline, not sting Lou and pressure drop in 30 minutes is less than 0.5MPa is qualified;
2) just to squeeze mode, 0.5m
3the discharge capacity of/min injects spearhead, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
3) just to squeeze mode, 1.3m
3the discharge capacity of/min injects main body liquid, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
4) just to squeeze mode, 0.5m
3the discharge capacity of/min injects subsequent fluid, then with 0.1m
3the discharge capacity companion fluid injection nitrogen of/min;
5) just to squeeze mode, 0.4m
3subsequent fluid slowly replaces to reservoir by the discharge capacity active water of/min;
6) closing well drives a well after 15 hours pressure release, and use active water well-flushing, wash out raffinate in pit shaft, recur out down-hole de-plugging operating tool string.This oil well day produce oil 0.2t/d before breaking block treatment, day produce oil 2.13t/d after breaking block treatment, increase day by day oily 1.93t/d.
Embodiment 2
In the present embodiment oil well with slow unblocking agent by spearhead, main body liquid, subsequent fluid according to volume 42m
3, 126m
3and 42m
3composition; Spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 1%, citric acid 0.5%, AS-30.5%, SJ-210.5%, butyl glycol ether 0.5%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, and inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
De-plugging of well method, comprises the following steps:
1) for HH37P23 well, first trip out flow string in well, under enter sand-flushing pipe column and carry out sand washing operation, trip out sand-flushing pipe column after the sand washing end of job, under enter tieback string and be incorporated into 1861.53m, after tieback is qualified, 350 type well heads are installed, to oil jacket annulus test to 5MPa, it is qualified that pressure drop in 10 minutes is less than 0.5MPa, connect surface pipeline, pressure testing is carried out to well head and surface pipeline, not sting Lou and pressure drop in 30 minutes is less than 0.5MPa is qualified;
2) just to squeeze mode, 0.5m
3the discharge capacity of/min injects spearhead, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
3) just to squeeze mode, 1.1m
3the discharge capacity of/min injects main body liquid, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
4) just to squeeze mode, 0.5m
3the discharge capacity of/min injects subsequent fluid, then with 0.1m
3the discharge capacity companion fluid injection nitrogen of/min;
5) just to squeeze mode, 0.3m
3subsequent fluid slowly replaces to reservoir by the discharge capacity active water of/min;
6) closing well drives a well after 12 hours pressure release, and use active water well-flushing, wash out raffinate in pit shaft, recur out down-hole de-plugging operating tool string.This oil well day produce oil 0.53t/d before breaking block treatment, day produce oil 3.04t/d after breaking block treatment, increase day by day oily 2.51t/d.
Embodiment 3
In the present embodiment oil well with slow unblocking agent by spearhead, main body liquid, subsequent fluid according to volume 55m
3, 175m
3and 55m
3composition; Spearhead is made up of the component of following mass percent: hydrochloric acid 8%, ammonium chloride 1.2%, citric acid 0.4%, AS-30.6%, SJ-210.4%, butyl glycol ether 0.6%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, inhibiter 0.5%, butyl glycol ether 0.5%, and surplus is water; Subsequent fluid is made up of the component of following mass percent: hydrochloric acid 8%, ammonium chloride 1%, citric acid 0.5%, AS-30.4%, SJ-210.4%, butyl glycol ether 0.6%, and surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
De-plugging of well method, comprises the following steps:
1) for HH37P35 well, first trip out flow string in well, under enter sand-flushing pipe column and carry out sand washing operation, trip out sand-flushing pipe column after the sand washing end of job, under enter tieback string and be incorporated into 2022.09m, after tieback is qualified, 350 type well heads are installed, to oil jacket annulus test to 5MPa, it is qualified that pressure drop in 10 minutes is less than 0.5MPa, connect surface pipeline, pressure testing is carried out to well head and surface pipeline, not sting Lou and pressure drop in 30 minutes is less than 0.5MPa is qualified;
2) just to squeeze mode, 0.7m
3the discharge capacity of/min injects spearhead, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
3) just to squeeze mode, 1.5m
3the discharge capacity of/min injects main body liquid, then with 0.15m
3the discharge capacity companion fluid injection nitrogen of/min;
4) just to squeeze mode, 0.7m
3the discharge capacity of/min injects subsequent fluid, then with 0.1m
3the discharge capacity companion fluid injection nitrogen of/min;
5) just to squeeze mode, 0.5m
3subsequent fluid slowly replaces to reservoir by the discharge capacity active water of/min;
6) closing well drives a well after 18 hours pressure release, and use active water well-flushing, wash out raffinate in pit shaft, recur out down-hole de-plugging operating tool string.This oil well day produce oil 0.12t/d before breaking block treatment, day produce oil 3.85t/d after breaking block treatment, increase day by day oily 3.73t/d.
In above-described embodiment 1 ~ 3, hydrochloric acid (31%), ammonium chloride, citric acid, Glacial acetic acid (98%), fluoroboric acid (30%) etc. all adopt industrial rank.
De-plugging benchmark test
Test method: take off formation core shown in table 1, the slow unblocking agent adopting embodiment 2 to prepare carries out de-plugging process, and measure core permeability change before and after de-plugging, and calculate resume permeability rate, test-results sees the following form 1.
Core permeability before and after table 1 de-plugging
Claims (8)
1. the slow unblocking agent of oil well, is characterized in that: be made up of according to volume ratio 40 ~ 55:125 ~ 175:40 ~ 55 spearhead, main body liquid, subsequent fluid; Spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, and inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, surplus is water.
2. slow unblocking agent according to claim 1, is characterized in that: spearhead, subsequent fluid are made up of the component of following mass percent respectively: hydrochloric acid 8%, ammonium chloride 1%, citric acid 0.5%, Xie Shui locks agent 0.5%, inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water; Main body liquid is made up of the component of following mass percent: Glacial acetic acid 5%, fluoroboric acid 3%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, and inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water.
3. slow unblocking agent according to claim 1 and 2, is characterized in that: it is AS-3 that described Xie Shui locks agent.
4. slow unblocking agent according to claim 1 and 2, is characterized in that: described inhibiter is SJ-21.
5. de-plugging of well method, is characterized in that: comprise the following steps: in horizontal well, inject the slow unblocking agent according to any one of Claims 1 to 4, companion's fluid injection nitrogen, closing well after active water replaces.
6. method for removing blockage according to claim 5, is characterized in that: in slow unblocking agent, spearhead, main body liquid, subsequent fluid all inject just to squeeze mode, and the injection discharge capacity of spearhead, subsequent fluid is respectively 0.5 ~ 0.8m
3/ min, the injection discharge capacity of main body liquid is 1 ~ 1.5m
3/ min.
7. method for removing blockage according to claim 5, is characterized in that: before injecting slow unblocking agent, first trips out flow string in well, under enter sand-flushing pipe column and carry out sand washing operation, trip out sand-flushing pipe column after the sand washing end of job, under enter tieback string.
8. method for removing blockage according to claim 5, is characterized in that: the time of described closing well is 10 ~ 20 hours, and drive a well after closing well reaction pressure release, well-flushing.
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