CN104818003A - High-temperature and low-pressure oil-gas well protection reservoir workover fluid - Google Patents
High-temperature and low-pressure oil-gas well protection reservoir workover fluid Download PDFInfo
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- CN104818003A CN104818003A CN201510156436.4A CN201510156436A CN104818003A CN 104818003 A CN104818003 A CN 104818003A CN 201510156436 A CN201510156436 A CN 201510156436A CN 104818003 A CN104818003 A CN 104818003A
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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Abstract
The present invention relates to a high-temperature and low-pressure oil-gas well protection reservoir workover fluid, and belongs to the technical field of petroleum natural gas well protection fluid. The high-temperature and low-pressure oil-gas well protection reservoir workover fluid comprises, by mass, 0.3% of NaOH, 0.2% of Na2CO3, 3.5% of a suspension stabilizer, 8.0% of a film-forming blocking agent, 5.0% of a high temperature filtrate reducer, 1.5% of a high temperature hydrogel, 1.0% of an inorganic hydrogel ((HIG-a):(HIG-b)=1:3), 3% of KCl, 5% of a complexing agent HLH-1, and the balance of fresh water. According to the present invention, the high-temperature and low-pressure oil-gas well protection reservoir workover fluid has characteristics of long term pressure-bearing blocking property, reservoir protection property, rheological property, good temperature-resistance stability, strong compatibility, substantial reduction of corrosion on underground oil pipes, easy bottom hole cleaning, and workover fluid saving; and the problems of high leakage, difficult backflow, poor thermal stability, poor rheological property, poor filtration loss property, workover fluid loss increase, and difficult bottom hole cleaning of the use of the existing technology for the well workover of the high-temperature and low-pressure oil-gas well easy-leakage reservoir are solved.
Description
Technical field
The present invention relates to a kind of high-temperature low-pressure oil gas well protection reservoir workover fluid, belong to oil and gas well protection liquid technical field.
Background technology
Repairing, get rid of Oil/gas Well fault, improving borehole condition is the important process improving old Oil/gas Well per-well production and recovery ratio, extend its production cycle, excavate old well potentiality, find new layer position, expand exploration results.For high-temperature low-pressure Oil/gas Well, because the next layer position of well may meet with the disorderly series of strata of multiple high-temperature low-pressure, therefore ubiquity following defect when using existing conventional workover fluid well workover: the wastage of first workover fluid is large, the row's of returning difficulty.Two to be that low pressure well produces the time length long for it, and workover fluid is to the seriously corroded of down-hole oil tube, and meanwhile, high temperature is very big on the thermostability of workover fluid, rheological, leak-off impact, adds the waste of workover fluid.It three is that work at the bottom of clear well is quite difficult.Therefore, research and development can the workover fluid of anti-down-hole high-temperature low-pressure bad ground, is the emphasis that international and domestic scientific and technical personnel in the industry pay close attention to all the time.
Summary of the invention
The object of the invention is to, there is provided a kind of for high-temperature low-pressure Oil/gas Well reservoir permeability leakage characteristics, there is rheological, temperature resistance stability, pressure-bearing seal-off effect, the advantage good to reservoir protection, compatibleness is strong, reduce the corrosion to down-hole oil tube to greatest extent, shaft bottom convenient for cleaning, saves workover fluid; When solution prior art is used for the reservoir well workover of high-temperature low-pressure Oil/gas Well leakiness, wastage is large, the row's of returning difficulty, and thermostability, rheological, leak-off are poor, increase workover fluid waste, and not easily reservoir workover fluid protected by the high-temperature low-pressure gas well of clean shaft bottom problem.
The present invention realizes above-mentioned purpose by the following technical solutions
A kind of high-temperature low-pressure oil gas well protection reservoir workover fluid, is characterized in that: it comprises following component, each component by mass percentage:
NaOH is 0.3%, Na
2cO
3 be 0.2%, suspension stabilizer HWDX is 3.5%, film forming plugging agent HWFD is 8.0%, high temperature water retaining HWDL is 5.0%, high-temperature water gel HWNJ is 1.5%, inorganic hydrogel (HIG-a:HIG-b=1:3) is 1.0%, KCl is 3%, complexing agent HLH-1 is 5%, surplus is fresh water.
Described complexing agent HLH-1, by forming hydrogen bond with intermolecular with water molecules in molecule, makes form network structure in water molecules and between water molecules and become complexing water: water molecules and complexing agent functional group also can produce intermolecular complexing under the effect of hydrogen bond.
The high temperature suspension stabilizer DRY-S2 that described suspension stabilizer selects petroleum engineering institute of Northeast Petroleum University to develop, or the suspension stabilizer HWDX of Hubei Hanke Hi-Tech Co., Ltd.'s development, be made up of the primary monofilament of one through special process, mix with system and form network structure after spreading, there is well dispersed and suspension, the suspending power of the fluid that can be multiplied.
The PF-FPA film forming plugging agent being taken the development of oilfield chemistry division department by CNOOC selected by described film forming plugging agent, or the HWFD of Hubei Hanke Hi-Tech Co., Ltd.'s development; HWFD film forming plugging agent can wellbore fluids and borehole wall interface formed one deck completely isolated, close the aqueous phase film of migrating, with stabilizing borehole.
The present invention's beneficial effect is compared with prior art
This high-temperature low-pressure gas well protection reservoir workover fluid has long pressure-bearing seal-off effect and excellent reservoir protection performance.Temperature resistance stability can up to 180 DEG C, and complexing agent HLH-1, by forming hydrogen bond with intermolecular with water molecules in molecule, makes form network structure in water molecules and between water molecules and become complexing water; Biodegradable, free from environmental pollution, nontoxic to human-body safety.Suspension stabilizer HWDX is formed by through a kind of primary monofilament of special process, mix with system and form network structure after spreading, there is well dispersed and suspension, abundant winding, catch foreign material, thus increase the suspending power of fluid exponentially, rheological is good, compatibleness is strong, film forming plugging agent HWFD wellbore fluids and borehole wall interface formed a kind of completely isolated, close the aqueous phase film of migrating, realize the object of stabilizing borehole, greatly reduce the corrodibility to down-hole oil tube, shaft bottom convenient for cleaning, save workover fluid; Solve prior art well large for high-temperature low-pressure Oil/gas Well workover fluid wastage, the row of returning difficulty, thermostability, rheological, leak-off are poor, increase workover fluid waste, and the problem in not easily clean shaft bottom.
Accompanying drawing explanation
Accompanying drawing 1 is the heatproof stability test graphic representation of a kind of high-temperature low-pressure gas well protection reservoir workover fluid;
Accompanying drawing 2 is that a kind of high-temperature low-pressure gas well protection reservoir workover fluid is to the pressure-bearing seal-off effect trial curve figure of wet 551# synthetic core;
Accompanying drawing 3 is that a kind of high-temperature low-pressure gas well protection reservoir workover fluid is to the pressure-bearing seal-off effect trial curve figure of wet 1# natural core;
Accompanying drawing 4 is that a kind of high-temperature low-pressure gas well protection reservoir workover fluid is to the pressure-bearing seal-off effect trial curve figure of wet 505# synthetic core;
Accompanying drawing 5 is a kind of high-temperature low-pressure gas well protection reservoir workover fluid carries out shutoff again pressure-bearing seal-off effect trial curve figure to the 551# synthetic core after shutoff.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail:
The invention provides a kind of high-temperature low-pressure oil gas well protection reservoir workover fluid, it comprises following component, each component by mass percentage:
NaOH is 0.3%, Na
2 cO
3 be 0.2%, suspension stabilizer HWDX is 3.5%, film forming plugging agent HWFD is 8.0%, high temperature water retaining HWDL is 5.0%, high-temperature water gel HWNJ is 1.5%, inorganic hydrogel (HIG-a:HIG-b=1:3) is 1.0%, KCl is 3%, complexing agent HLH-1 is 5%, surplus is fresh water.
Described complexing agent HLH-1, by forming hydrogen bond with intermolecular with water molecules in molecule, makes form network structure in water molecules and between water molecules and become complexing water: water molecules and complexing agent functional group also can produce intermolecular complexing under the effect of hydrogen bond.
The high temperature suspension stabilizer DRY-S2 that described suspension stabilizer selects petroleum engineering institute of Northeast Petroleum University to develop, or the suspension stabilizer HWDX of Hubei Hanke Hi-Tech Co., Ltd.'s development; HWDX suspension stabilizer is made up of the primary monofilament of one through special process, mix with system and form network structure after spreading, mix with system and form network structure after spreading, there is well dispersed and suspension, abundant winding, catch foreign material, the suspending power of the fluid that can be multiplied.
The PF-FPA film forming plugging agent being taken the development of oilfield chemistry division department by CNOOC selected by described film forming plugging agent, or the HWFD of Hubei Hanke Hi-Tech Co., Ltd.'s development; HWFD film forming plugging agent can wellbore fluids and borehole wall interface formed one deck completely isolated, close the aqueous phase film of migrating, realize the object of stabilizing borehole.
Embodiment 1
Lab-evaluation is carried out to this high-temperature low-pressure oil gas well protection reservoir workover fluid:
1, rheological
Prepare this high-temperature low-pressure oil gas well protection reservoir workover fluid, by the rheological left standstill at six fast rotary viscosity design determining 180 DEG C after heating different time, experimental result is in table 1.
This high-temperature low-pressure oil gas well protection reservoir workover fluid rheology measurement result of table 1
From experimental result table 1, this high-temperature low-pressure oil gas well protection reservoir workover fluid constant temperature 70 days at 180 DEG C, rheological change is little, the temperature tolerance had.
2, heatproof stability
Prepare this high-temperature low-pressure oil gas well protection reservoir workover fluid, load digestion tank, leave standstill aging at 180 DEG C of constant temperature, regularly take out and measure upper lower density, observe its heatproof stability trend, see accompanying drawing 1.
Constant temperature 70 days at 180 DEG C, difference of densities is less than or equal to 0.02g/cm
3, the temperature stability had.
3, pressure-bearing seal-off effect
The pressure-bearing shutoff experimental evaluation that indoor High Temperature High Pressure pressure-bearing shutoff evaluation test instrument carries out in different condition this high-temperature low-pressure oil gas well protection reservoir workover fluid is as follows:
A, the pressure-bearing seal-off effect of dry rock core 90min to be evaluated
Select the synthetic core of different rate of permeation, this rock core is saturated without local water, and under 180 DEG C × 30MPa × 90min condition, directly carry out pressure-bearing plugging effect evaluation, experimental result is in table 2:
Table 2 is to the evaluation result of dry rock core pressure-bearing seal-off effect
From experimental result table 2, in 90min, leakage liquid is wetting dry rock core slowly, and fill the hole of rock core, wastage is zero.
B, the pressure-bearing seal-off effect of dry rock core 48h to be evaluated
Further intensified pressure and time expand, dry rock core is still saturated without local water, directly carries out pressure-bearing plugging effect evaluation as table 3 under 180 DEG C × 33MPa × 48h condition:
Table 3 is to dry rock core pressure-bearing seal-off effect evaluation result
From the evaluating data of table 3, the dry rock core of saturated local water, directly 48h is polluted at 180 DEG C × 33MPa, its filter loss is still zero, this is because synthetic core volume of voids is at about 12ml, be full of pipeline and about need 1.5ml, in pollution course, leak-off liquid is all for filling rock core hole and pipeline, therefore wastage not yet zero.
C, the pressure-bearing seal-off effect of wet rock core 60h to be evaluated
In order to further simulation stratum condition, by Party A's requirement, choose synthetic core and the natural core of different rate of permeation, under indoor 180 DEG C × 33MPa × 60h condition, the pressure-bearing seal-off effect of wet rock core is evaluated, synthetic core and natural core are first used stratum water saturation, and then the pressure-bearing plugging effect of 551# synthetic core, 1# natural core is evaluated, see accompanying drawing 2, accompanying drawing 3.
Above experimental result shows, this high-temperature low-pressure oil gas well protection reservoir workover fluid is under 180 DEG C × 33MPa × 60h condition, and the synthetic core after local water is saturated and natural core all have good seal-off effect, and after stable, average leakoff rate is all less than 0.4ml/h.
D, the dynamic pressure-bearing seal-off effect of wet rock core 60h to be evaluated
In order to further simulated field construction technology, by Party A's requirement, the indoor dynamic pressure-bearing seal-off effect to synthetic core wet rock core under 180 DEG C × 33MPa × 60h condition is evaluated, and this 505# synthetic core first uses stratum water saturation, and then carry out pressure-bearing plugging effect evaluation, see accompanying drawing 4.
Experimental result shows, the wet synthetic core after saturated by local water under 180 DEG C × 33MPa × 60h condition has good dynamic plugging, and after stable, average leakoff rate is all less than 0.4ml/h.
E, after aging 70 days to the pressure-bearing seal-off effect of wet rock core 60h
According to on-the-spot well workover execution conditions; the workover treatment time is about 60 days; in order to simulated field long-time well workover shutoff situation; this high-temperature low-pressure oil gas well protection reservoir workover fluid and the aforementioned 551# synthetic core doing pressure-bearing shutoff are together put into digestion tank by indoor; after leaving standstill aging 70 days at 180 DEG C; take out the pressure-bearing seal-off effect carrying out this rock core under 180 DEG C × 33MPa × 60h condition again to evaluate, see accompanying drawing 5.
Experimental result shows; after shutoff, 551# synthetic core and this high-temperature low-pressure oil gas well protection reservoir workover fluid one to coexist at 180 DEG C constant temperature after 70 days; the pressure-bearing seal-off effect carrying out 60h under 180 DEG C × 33MPa is again evaluated; its leakoff rate is all at below 0.5ml/h; and reach stable very soon; still have good pressure-bearing seal-off effect, this is because this high-temperature low-pressure oil gas well protection reservoir workover fluid self has good temperature resistance stability, the long-time pressure-bearing seal-off effect therefore had.
4, reservoir protection
Laboratory experiment, carries out the evaluation of reservoir protection performance by natural core to this high-temperature low-pressure oil gas well protection reservoir workover fluid, the results are shown in Table 4:
Table 4 reservoir protection evaluation result
From experimental result table 4, under 180 DEG C × 33MPa condition, use this high-temperature low-pressure oil gas well protection reservoir workover fluid to pollute rock core after 1 day to the natural core of three mouthfuls of wells, directly the row's of returning breakthrough pressure is all not high for it, be respectively 0.0940MPa, 0.3000MPa, 0.0125MPa, and the permeability resume figure of correspondence is all about 80%; If continue, increase is corresponding returns row pressure power 0.2MPa, 0.5MPa, 0.05MPa, then the permeability resume figure of three mouthfuls of rock cores all reaches more than 85%, the reservoir protection performance shown.
The above is the embodiment of this invention, above-mentioned illustrating is not construed as limiting flesh and blood of the present invention, person of an ordinary skill in the technical field can make an amendment above-mentioned embodiment or be out of shape after having read this specification sheets, and does not deviate from the spirit and scope of the invention.
Claims (4)
1. a high-temperature low-pressure oil gas well protection reservoir workover fluid, is characterized in that: it comprises following component, each component by mass percentage:
NaOH is 0.3%, Na
2cO
3be 0.2%, suspension stabilizer HWDX is 3.5%, film forming plugging agent HWFD is 8.0%, high temperature water retaining HWDL is 5.0%, high-temperature water gel HWNJ is 1.5%, inorganic hydrogel (HIG-a:HIG-b=1:3) is 1.0%, KCl is 3%, complexing agent HLH-1 is 5%, surplus is fresh water.
2. a kind of high-temperature low-pressure oil gas well protection reservoir workover fluid according to claim 1; it is characterized in that: described complexing agent HLH-1, by forming hydrogen bond with intermolecular with water molecules in molecule, makes form network structure in water molecules and between water molecules and become complexing water: water molecules and complexing agent functional group also can produce intermolecular complexing under the effect of hydrogen bond.
3. a kind of high-temperature low-pressure oil gas well protection reservoir workover fluid according to claim 1; it is characterized in that: the high temperature suspension stabilizer DRY-S2 that described suspension stabilizer selects petroleum engineering institute of Northeast Petroleum University to develop; or the suspension stabilizer HWDX of Hubei Hanke Hi-Tech Co., Ltd.'s development; be made up of the primary monofilament of one through special process; mix with system and form network structure after spreading; there is well dispersed and suspension, the suspending power of the fluid that can be multiplied.
4. a kind of high-temperature low-pressure oil gas well protection reservoir workover fluid according to claim 1; it is characterized in that: the PF-FPA film forming plugging agent being taken the development of oilfield chemistry division department by CNOOC selected by described film forming plugging agent; or the HWFD of Hubei Hanke Hi-Tech Co., Ltd.'s development; HWFD film forming plugging agent can wellbore fluids and borehole wall interface formed one deck completely isolated, close the aqueous phase film of migrating, with stabilizing borehole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510156436.4A CN104818003A (en) | 2015-04-03 | 2015-04-03 | High-temperature and low-pressure oil-gas well protection reservoir workover fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510156436.4A CN104818003A (en) | 2015-04-03 | 2015-04-03 | High-temperature and low-pressure oil-gas well protection reservoir workover fluid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575216A (en) * | 2017-08-29 | 2018-01-12 | 湖北汉科新技术股份有限公司 | A kind of applicable recessive acid workover fluid and stratum compatible Slope map of pixels |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5008025A (en) * | 1989-11-16 | 1991-04-16 | Mobil Oil Corporation | Sulfonate-containing polymer/polyanionic cellulose combination for high temperature/high pressure filtration control in water base drilling fluids |
| CN101337796A (en) * | 2008-07-15 | 2009-01-07 | 中国海洋石油总公司 | Liquid cement mortar capable of being stored |
-
2015
- 2015-04-03 CN CN201510156436.4A patent/CN104818003A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5008025A (en) * | 1989-11-16 | 1991-04-16 | Mobil Oil Corporation | Sulfonate-containing polymer/polyanionic cellulose combination for high temperature/high pressure filtration control in water base drilling fluids |
| CN101337796A (en) * | 2008-07-15 | 2009-01-07 | 中国海洋石油总公司 | Liquid cement mortar capable of being stored |
Non-Patent Citations (3)
| Title |
|---|
| 张清等: "高温悬浮稳定剂DRY-S2的研究及应用", 《钻井液与完井液》 * |
| 郭磊等: "一种新型成膜封堵材料的研究及应用", 《科学技术与工程》 * |
| 颜明等: "保护储层的络合水修井液技术研究", 《石油天然气学报(江汉石油学院学报)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575216A (en) * | 2017-08-29 | 2018-01-12 | 湖北汉科新技术股份有限公司 | A kind of applicable recessive acid workover fluid and stratum compatible Slope map of pixels |
| CN107575216B (en) * | 2017-08-29 | 2020-11-13 | 湖北汉科新技术股份有限公司 | Novel method for evaluating compatibility of invisible acid workover fluid and formation water |
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Application publication date: 20150805 |