CN102022105B - Large composite acid fracturing method of fracture cave type carbonate rock reservoir - Google Patents
Large composite acid fracturing method of fracture cave type carbonate rock reservoir Download PDFInfo
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Abstract
The invention relates to a large composite acid fracturing method of a fracture cave type carbonate rock reservoir. The method is characterized by comprising the following steps of while communicating a plurality of fracture caves on the periphery of a shaft of the reservoir: (1) filling quick water into the stratum through the oil pipe of the mixed filling with the oil sleeve; (2) adding powdered ceramic to the stratum through the oil pipe; (3) filling acid liquid into the stratum through the oil pipe for the first time; (4) filling acid liquid into the stratum through the oil pipe for the second time; and (5) filling excess displacing liquid through the oil pipe or the mixed filling with the oil sleeve, wherein the large composite acid fracturing method indicates that the total construction liquid quantity is more than 2,000m<3>. The invention improves the length of an artificial acid fracturing fracture to reach longer than 140m and solves the problem that a conventional acid fracturing technology of a fracture cave type carbonate rock reservoir within the range of 200m of the shaft cannot communicate a far-shaft reservoir, and a new fracture cave reservoir is needed to be searched through side tracking.
Description
Technical field
The present invention relates to oil-gas field development technical field, be specifically related to the large-scale compound Acid Fracturing Technology of a kind of super dark seam hole type carbonate reservoir.
Background technology
Carbonate reservoir is one of important oil and gas reservoir.Abroad since last century the mid-1970s carry out riverfrac treatment desk research and field trial, experienced clear water not with proppant pressure break, conventional riverfrac treatment, mixing riverfrac treatment (Wang Subing, riverfrac treatment Review of The Process, natural gas exploration and exploitation, 2005,28 (4): 39-42).In addition, acid fracturing is recovered and is improved permeability, the raising Oil & Gas Productivity on stratum by sour corrosion, be one of important well stimulation of carbonate reservoir transformation.Along with the deep exploitation of carbonate reservoir, acid fracturing obtains applying more and more widely.
Growth plane, the vertical heterogeneity of Ordovician system seam hole type carbonate reservoir reservoir are serious, and in plane, reservoir continuity is poor, has a large amount of disconnected constant volume Reservoir Bodies, causes overall recovery ratio low.This class well generally can only be linked up on orientation of principal stress a seam hole Reservoir Body nearest within the scope of distance well 120m when conventional acid fracturing, according to oil field acid fracturing, follows the tracks of statistics, exists production declining fast, the problem that period of validity is short after pressure.
Summary of the invention
The inventor has carried out many-sided research for the exploitation in carbonate reservoir oil field.Effective clossing pressure of the carbonate reservoir in this class oil field is conventionally between 45-62MPa, for early stage oil field once attempted adopting the mode of waterpower dilatation to link up new Reservoir Body, but because finishing rear closing up of cracks, construction loses flow conductivity, do not form new oil flow channel, cause construction effect poor or invalid.The flow conductivity that the inventor produces man-made fracture by different forms of construction work is thought with clossing pressure Changing Pattern in-house laboratory investigation: low clossing pressure carbonate reservoir, first-selected acid fracturing; For high clossing pressure carbonate reservoir, if intrinsic fracture is grown, should adopt acid fracturing; If reservoir is fine and close, intrinsic fracture agensis, with due regard to waterpower sand fracturing, during fracturing reform, in order effectively to prevent sand plug, can adopt compared with small particle diameter proppant supporting crack, to obtain the longer production cycle.
For this class pit shaft, there is a plurality of seams hole system around, acid fracturing is only linked up the well of some little constant volume bodies for the first time, the inventor, by the little constant volume Reservoir Body of large-scale Compound-acid compression technology technological break-through, injects a large amount of slippery water by high strength and forms longer man-made fracture; Construction period adds haydite to realize the temporarily stifled microcrack of filling part, reduce liquid leak-off, improve liquid efficiency, slow down acid fracturing fracture height excessively extends, and haydite is stayed stratum, and later stage production period still can keep certain flow conductivity; By high strength, injecting the acid with certain width generation capacity forms certain acid-etched fracture and continues to realize and make seam; By high strength, inject the acid system that acid etching ability is strong and further form acid-etched fracture; The last replacement technology of crossing realizing again during acid has activity, it pushes the activated acid solution of tool to depth of stratum by inject excessive displacement fluid before acid activity ability reduces, realize and linking up away from seam hole Reservoir Body more than pit shaft 140m, thereby the large-scale compound acid fracturing method that the invention provides following a kind of super dark seam hole type carbonate reservoir, described surpassing refers to that depth of reservoirs is in about 6000m-7500m scope deeply.
Specifically, a kind of large-scale compound acid fracturing method of stitching hole type carbonate reservoir, is characterized in that, it,, when a plurality of seams hole body around of the pit shaft of linking up reservoir, comprises following operation:
1) by oil pipe or oil jacket mixed water injection to the operation of injecting slippery water in stratum,
2) by oil pipe to the operation that adds powder pottery in stratum,
3) by oil pipe, to injecting acid solution in stratum, carry out the operation of acid filling for the first time,
4) by oil pipe, to injecting acid solution in stratum, carry out the operation of acid filling for the second time,
5) by oil pipe or oil jacket mixed water injection to the operation of injecting excessive displacement fluid in stratum;
Wherein, described large-scale compound acid fracturing refers to the total liquid measure 2000m of construction
3above;
Operation 1), 3) liquid, 4), 5) injecting accounts for the volume ratio that injects the total liquid in stratum and is respectively: operation 1), slippery water accounts for 50-75%, operation 3) and operation 4) middle acid solution total amount accounts for 15-25%; , operation 5) in displacement fluid account for 10-25%; Operation 2) in operation 1) carry out when carrying out, the powder ceramic amount adding accounts for operation 1) in the volume ratio of slippery water be: 1.0-12.3%, wherein powder pottery mass unit be ton (t), operation 1) volume unit of middle slippery water is m
3.
Wherein, operation 3) acid solution of injecting in is to have the acid solution of making joint function, wherein, sour composition in described acid solution can be a kind of in hydrochloric acid, hydrofluoric acid, sulfamic acid or low molecular carboxylic acid, preferred hydrochloric acid, in addition, described low molecular carboxylic acid preferable formic acid, acetic acid or propionic acid; In this acid solution, conventionally contain activator.
Operation 4) acid solution of injecting in is the acid that acid etching ability is strong, and wherein, the sour composition in described acid solution can be hydrochloric acid, hydrofluoric acid or sulfamic acid, preferably hydrochloric acid; In this acid solution, conventionally do not contain activator.
Wherein, preferably in described operation 3) and 4) between also comprise to the operation that re-injects slippery water in stratum;
Wherein, the slippery water and the operation 3 that while carrying out acid fracturing, preferred described operation 1), add) and 4) add the ratio of acid solution total amount to be: 3～5.
Wherein, preferable process 5) in operation 4) carry out afterwards, or preferably in operation 3) and operation 4) between carry out;
Wherein, the operation of preferred described operation 1) injecting slippery water in stratum comprises repeatedly injects smooth operation.
Wherein, the operation that preferred described operation 2) adds powder pottery in stratum comprises the operation that repeatedly adds powder pottery.
Wherein, preferable process 3) and operation 4) repeatedly hocket.
Wherein, carry out acid fracturing when construction, preferably adopt 31/2 " oil pipe or 4 " oil pipe, for example can adopt 31/2 " EUE external upset tubing or meet the latus rectum of requirement of strength larger 4 " oil pipe reduce oil pipe and be lowered to length.
Wherein, preferable process 2) pottery of powder described in is 100 object haydites, adds powder pottery object to be to reduce liquid leak-off, controls that seam is high excessively extends and improve long-term flow conductivity of later stage; Described powder pottery is preferably the high-intensity haydite of 100 order 86MPa, and described powder pottery adopts Tyler screen to sieve and obtains, that is, the particle diameter that 100 orders are corresponding is 147 μ m.
Wherein, preferably in operation 3) in, the acid of injecting is the acid that becomes sticky, it consists of: the 0.8% sour gelling agent butyl acrylate+2.0% high-temperature corrosion inhibitor KI+1.0% cleanup additive APES+1.0% ferrous stability ascorbic acid+1.0% demulsifier SYNPERONIC PE/F68+0.5% acid activators ethyl acyl ammonium+water that becomes sticky that becomes sticky, preferably in operation 4) in, the acid of injecting is also the acid that becomes sticky.More preferably operation 3) and operation 4) the composition difference of acid solution used is only, operation 3) in contain activator, operation 4) acid solution in do not contain activator.In addition, in operation 4) in, the acid of injecting can be also gel acid, does not wherein contain activator.
Wherein, preferably in operation 1) in, described slippery water is oil field carbonate formation water+0.45% guar gum hydroxypropyl-trimethyl ammonium chloride.
Wherein, preferably in operation 1) in, described slippery water operational discharge capacity is 6.5～10.2m
3/ min.
The present invention, by significantly increasing acid fracturing volume and operational discharge capacity, adopts prepad fluid powder pottery to fall the means such as filter simultaneously, improves and makes seam length; Adopt acid solution to cross and replace the flow conductivity that technique improves fracture tip, increase acid etching earthworm hole and in end, link up the probability of Reservoir Body, thereby what solved that seam hole type Carbonate Reservoir part acid fracturing wells exists fails to link up pit shaft Reservoir Body far away, and after pressing, production declining is fast, the problem that period of validity is short.
Accompanying drawing explanation
Fig. 1 is the influence curve figure of fracturing fluid discharge capacity fracture parameter.
Fig. 2 is the affect graph of relation of discharge capacity on sour rock reaction rate.
Fig. 3 is fracturing fluid consumption fracture parameter influence graph of relation.
Fig. 4 is the TK1078 well acid fracturing construction curve figure for the first time of embodiment 1.
Fig. 5 is that the TK1078 well of embodiment 1 repeats to implement acid fracturing construction curve figure.
Fig. 6 produces curve map after the TK1078 well of embodiment 1 is pressed.
Fig. 7 is the TH12137 well acid fracturing construction curve figure for the first time of embodiment 2.
Fig. 8 is that the TH12137 well of embodiment 2 repeats to implement acid fracturing construction curve figure.
Fig. 9 produces curve map after the TH12137 well of embodiment 2 is pressed.
The specific embodiment
For seam hole type carbonate reservoir, while adopting extensive acid fracturing method volume increase, follow following well and story selecting principle:
1. geological conditions:
1) in geology, there is good yield potential: seismic profile and amplitude change rate indicating characteristic are obvious, the relative high-order bit in plane, the offset well condition of production is good, and well is on favourable hydrocarbon charge band;
2) wellblock water body is inactive, and this well and offset well production period are not moisture or low moisture;
3) the seam hole body output that acid fracturing is linked up is for the first time little, energy shortage.
Engineering specifications:
1) cementing quality is good, without hole collapse phenomenon;
2) wellbore conditions meets construction demand.
As previously mentioned, conventional ACID FRACTURING TECHNOLOGY can only be linked up the pit shaft seam hole body within the scope of 120m around, and has little constant volume body reservoir around for pit shaft, has production capacity fast, the problem such as stratum feed flow is not enough, production period of validity is short that declines after pressure.For realize deep penetration, take link up pit shaft at a distance more seams hole Reservoir Body be target, the inventor is studied acid fracturing technique from many aspects at Oil Field.Fig. 1 is the influence curve figure of the fracturing fluid discharge capacity fracture parameter after analog computation.As seen from Figure 1, along with the increase of discharge capacity, seam is long and stitch all increases thereupon of height, improves operational discharge capacity as far as possible and reach anti-leak-off during site operation in the situation that pump pressure allows, and to reach, makes the slit communication pit shaft object of Reservoir Body at a distance.
In addition, the inventor has studied the impact of operational discharge capacity on sour rock reaction rate, and Fig. 2 is the affect graph of relation of discharge capacity on sour rock reaction rate.As seen from Figure 2, increase acid solution discharge capacity and can improve sour rock reaction speed, but the multiple proportions that sour rock reaction rate increases, be less than the multiple proportions that acid solution flow velocity increases, acid solution has little time to have reacted, inflow place layer depth place, can increase therefore improve acid filling discharge capacity the distance that active acid is goed deep into stratum, and then increases the long length of acid etching seam.In acid fracturing work progress, to improve acid solution discharge capacity as far as possible.In the method for the invention, 7-10.2m can be accomplished in acid solution discharge capacity scene
3/ min.
In addition, the inventor has studied the impact of fracturing fluid consumption fracture parameter, and Fig. 3 is fracturing fluid consumption fracture parameter influence graph of relation, and as seen from Figure 3, fracturing fluid consumption is larger, and seam is long and seam height is all larger, still, and when fracturing fluid consumption is 2000m
3when above, high the increasing of seam diminishes, and therefore, determines that fracturing fluid consumption is 2000m
3above.
In this article, the inventor, according to oil field acid fracturing transformation development course and scope of construction item development and standardization, determines that working fluid amount reaches 2000m
3above, operational discharge capacity reaches 8m
3/ min is large-scale compound acid fracturing method above.
According to the large-scale compound Acid Fracturing Technology of seam of the present invention hole type carbonate reservoir, its when a plurality of seams hole body around of the pit shaft of linking up reservoir,
Comprise following operation:
1) by oil pipe or oil jacket mixed water injection, in stratum, inject the operation of slippery water,
2) by oil pipe, in stratum, add the operation of powder pottery,
3) by oil pipe, in stratum, inject acid solution and carry out the operation of acid filling for the first time,
4) by oil pipe, in stratum, inject acid solution and carry out the operation of acid filling for the second time,
5) by oil pipe or oil jacket mixed water injection, in stratum, inject the operation of excessive displacement fluid;
Wherein, described large-scale compound acid fracturing refers to that the total liquid measure of construction is at 2000m
3above; Operation 1), 3) volume ratio that the liquid, 4), 5) injecting accounts for the total liquid in injection stratum is respectively: operation 1), slippery water accounts for 50-75%, preferably account for 60%-68%, operation 3) and operation 4) in acid solution total amount account for 15-25%, preferably account for 17-20%; Operation 5) in, displacement fluid accounts for 10-25%, preferably accounts for 13-22%; Operation 2) in operation 1) carry out when carrying out, the powder ceramic amount adding accounts for operation 1) in the volume ratio of slippery water be: 1.0-12.3%, preferred 1.3-7.0%, wherein powder pottery mass unit be ton (t), operation 1) volume unit of middle slippery water is m
3.
So long as there is the acid solution of making joint function, all can be used for operation 2) in, so long as there is strong acid erosion ability acid solution, all can be used for operation 3) in.
Wherein, the powder pottery adding, injects behind stratum, and powder pottery can form bridge blinding at intrinsic fracture and hydraulic fracture intersection, thereby reaches the object of the filter loss that reduces intrinsic fracture.Described powder pottery is the high-strength ceramsite that conventional 100 objects its intensity under 86MPa clossing pressure meets industry standard (percentage of damage is less than 10%), determines the consumption of powder pottery according to strata condition.Preferably in operation 3) in the acid solution injected contain activator, more preferably contain 0.5% activator, described activator is preferably buserelin.In addition, preferably in operation 3) in adopt the acid that becomes sticky in acid solution used, this acid that becomes sticky consists of: 0.8% sour gelling agent (butyl acrylate)+2.0% high-temperature corrosion inhibitor (KI)+1.0% cleanup additive (APES)+1.0% ferrous stability (ascorbic acid)+1.0% demulsifier (oxirane+expoxy propane)+0.5% acid activators (ethyl acyl ammonium) that becomes sticky that becomes sticky.In addition, described slippery water preferably adds 0.45% melon glue (guar gum hydroxypropyl-trimethyl ammonium chloride) in the water of oil field.
Wherein, in operation 1) in, by injecting slippery water, can supplement stratum deficit, renwing stratum pressure; Then, implement ultra-large acid fracturing transformation, can make the man-made fracture that acid fracturing forms for the first time extend forward, link up new seam hole Reservoir Body, reach the object that improves recovery ratio.
In addition, in method of the present invention, preferably in described operation 3) and 4) re-inject the step of slippery water, the i.e. excessive replacement technique of acid solution in being also included in stratum afterwards.Because acid fracturing is in most cases to link up new Reservoir Body by acid etching earthworm hole after acid solution enters stratum, therefore in order to improve acid solution, enter the probability of linking up new Reservoir Body after far-end, increase the flow conductivity of crack far-end simultaneously.
In addition, preferable process 3) and operation 4) repeatedly hocket, adopt multi-stage alternate to inject acid fracturing technique, that is to say, to stratum, repeatedly inject acid solution, the continuous cooling by prepad fluid can cooling stratum, reduces temperature in crack, slow down sour rock reaction speed, thereby extend acid solution action time; Acid solution fingering in prepad fluid, can further improve acid etching EFFECTIVE RANGE simultaneously.
In addition, in order to reduce construction frictional resistance, meeting under the condition of operating tool string requirement of strength, during construction, adopt 31/2 as far as possible " above large diameter oil pipe as EUE external upset tubing or meet the latus rectum of requirement of strength larger 4 " oil pipe; Guaranteeing under the prerequisite of tubing string safety simultaneously, reducing the length that is lowered to oil pipe as far as possible.Calculating shows, at 7m
3under/min discharge capacity, coefficient of friction resistance 8-10MPa/1000m, every minimizing
oil pipe, can reduce operation pressure 8-10MPa.
Embodiment
Below by the field trial of system in Tahe Oilfield being described in detail to acid fracturing method of the present invention.
To the acid fracturing construction for the first time of system in Tahe Oilfield TK1078 well
In acid fracturing work progress, involved liquid is composed as follows for the first time, and following percentage if no special instructions, all refers to quality %.
Linear glue: adopt to tell and breathe out the fracturing fluid goods that model that down-hole technical operation company sells is TH-HPG, it consists of: 20%HCl+0.5%HPG melon glue (guar gum hydroxypropyl-trimethyl ammonium chloride)+1.0%LZ-1 cleanup additive+1.0%LP-1 demulsifier+0.1%LK-7 bactericide+0.02%PH value conditioning agent+0.5%LK-6 temperature stability agent+1.0%LK-8 clay stabilizer, all the other are water.Wherein, melon glue is generally guar gum hydroxypropyl-trimethyl ammonium chloride.
Frozen glue: the LK-9 organic borate cross-linker that above-mentioned linear glue+Xinjiang Luntai County Li Ke oilfield technology Services Co., Ltd sells, crosslinked ratio is 100: 0.6 (this is the volume ratio of above-mentioned linear glue and crosslinking agent).
Gel acid: the gel acid goods that the model that adopts Xi'an super new science and technology Development Co., Ltd to sell is CX-208, it consists of: 20%HCl+1.0%CX-208 gelling agent+2.0%YHS-2 high-temperature corrosion inhibitor+1.0%CX-307 breakdown of emulsion cleanup additive+0.15%CX-301 ferrous stability, all the other are water.
In addition, it should be noted that, conventional those reagent as pH value conditioning agent, demulsifier, bactericide, cleanup additive, breakdown of emulsion cleanup additive, temperature stability agent, clay stabilizer, crosslinking agent, gelling agent, corrosion inhibiter and ferrous stability in every this area all can be used in the application.For example, gelling agent can be butyl acrylate, and corrosion inhibiter can be KI, ferrous stability can be ascorbic acid, cleanup additive can be APES, and demulsifier can be SYNPERONIC PE/F68, and activator can be buserelin.Cleanup additive described in the application and breakdown of emulsion cleanup additive adopt APES composed as follows conventionally: NPE (NPEO) accounts for 80%～85%, OPEO (OPEO) accounts for more than 15%, and binonylphenol and dodecyl phenol polyethenoxy ether respectively account for 1%.
Room group 6143.8～6228m well section of TK1078 well is carried out acid fracturing construction.Fig. 4 is TK1078 well acid fracturing construction curve figure for the first time.Clamp-on the total liquid measure 628m in stratum
3(wherein successively add successively linear glue 28m
3, frozen glue 300m
3, high temperature gel acid 300m
3, described frozen glue and gel acid are linear glue, fracturing fluid gel and gel acid conventional in acid-fracture technology), 26.6 ↓ 24.5MPa falls in termination of pumping pressure measurement.Row 376.5m is returned in acid fracturing blowing
3, having no oil, rear use nitrogen carries out gaslift operation, discharge opeing 87m
3after see oil, the blowing+gaslift accumulative total row of returning 463.5m
3.
This well is taken out because energy shortage turns.Turn take out during average day production fluid 8.1t, average day produce oil 6.6t, average moisture content 18.5%, production period liquid level declines very fast, stratum feed flow is not enough, subsequently, pilot flood is for oil, maximum pressure 12MPa between the flood period, hour water injection intensity 7.5m
3, difficult water injection, accumulative total water filling 160m
3.To without output closing well, tire out production fluid 0.296 * 10
4t, tired produce oil 0.255 * 10
4t, produces water 0.041 * 10
4m
3.
System in Tahe Oilfield TK1078 well large-scale is repeated to acid fracturing construction (large-scale compound acid fracturing)
Liquid involved in following repetition acid fracturing work progress is composed as follows, and following percentage if no special instructions, all refers to quality %.
Slippery water: 0.2%HPG melon glue, all the other are water.Wherein, described melon glue is the conventional guar gum hydroxypropyl-trimethyl ammonium chloride in this area.
Acid becomes sticky: the sour goods that become sticky that the model that adopts Sichuan beidellite oil tech Development Co., Ltd to sell is BD1-11, it consists of: 20%HCl+0.8%BD1-11 sour gelling agent+2.0%BD120C high-temperature corrosion inhibitor+1.0%BD1-2 ferrous stability+1.0%BD1-3 demulsifier+1.0%BD1-5 cleanup additive that becomes sticky, and all the other are water; The acid that becomes sticky of wherein, injecting for the first time also contains 0.5%BD1-12 activator.
It should be noted that, the conventional reagent as gelling agent, high-temperature corrosion inhibitor, ferrous stability, demulsifier, cleanup additive and activator in this area all can be used in the application.For example, gelling agent can be butyl acrylate, and corrosion inhibiter can be KI, ferrous stability can be ascorbic acid, cleanup additive can be APES, and demulsifier can be SYNPERONIC PE/F68, and activator can be buserelin.
TK1078 well has been implemented to extensive repetition acid fracturing construction, and Fig. 5 repeats to implement acid fracturing construction curve figure to TK1078 well.Operation process discharge capacity is at 6.6-7.7m
3/ min, pump pressure (equaling oil pressure) 80-91.2MPa, successively adds slippery water totally 13 times, and accumulative total is clamp-oned stratum slippery water 2044m
3, this smooth water yield adding for 13 times is respectively 50,100,150,50,100,50,100,100,400,138,262,500,44m
3, wherein, in the middle of adding slippery water the 11st time and adding the operation of slippery water for the 12nd time, by oil pipe, add the sour 400m that becomes sticky
3acid filling for the first time, adds after slippery water at the 12nd time, before adding slippery water the 13rd time, by oil pipe, adds for the second time the sour 30m that becomes sticky
3carry out the step of acid filling for the second time, during described first and second acid fracturings, add altogether the sour 430m that becomes sticky
3; Wherein, adding for the first time while becoming sticky acid, add and have activator ethyl acyl ammonium 2t in this becomes sticky acid, additional proportion is 0.5%; The object that adds activator ethyl acyl ammonium is to delay sour rock reaction, extends acid solution reflecting time, increases fracture length, and the effect of noting slippery water for the 12nd time is the acid solution of injecting to be for the first time driven to as far as possible to the end in crack, increases acid etching seam long; The object of acid adding is the crack of processing nearly pit shaft for the second time, increases its flow conductivity, does not add activator ethyl acyl ammonium and contributes to sour rock fast reaction; In addition, also add powder pottery when the 2nd, 4,6,8,10 times shown in Fig. 5 add slippery water, in each step, powder pottery is respectively 6t, 3t, 3t, 7t, 8t, amounts to powder pottery 27t; 13.5 ↓ 10.5MPa falls in termination of pumping pressure measurement.
From the construction curve of Fig. 5, can find out, add the powder pottery stage, bottom pressure rises obviously, shows that powder pottery has comparatively effectively played the filter effect of falling, and man-made fracture constantly extends forward; Just crowded acid solution and high discharge capacity replace acid solution process and add slippery water 500m the 12nd time
3with add slippery water 44m the 13rd time
3operation, minutes two stages of bottom-hole treating pressure (oil pressure) decline, fall reaches 20.37MPa, fall off rate 0.19MPa/min shows that acid-etched fracture constantly linked up new Reservoir Body in extension process; Construction termination of pumping pressure 13.5 ↓ 10.5MPa, acid fracturing is processed more for the first time reduction by a relatively large margin, totally shows that this repeats the favourable Reservoir Body that well far away area has been linked up in acid fracturing construction.
The construction effectiveness commentary:
Matching after construction curve having been carried out pressing according to operation pressure, and twice fitting result is contrasted, in Table 1:
Rear fitting result comparative analysis situation is pressed in twice acid fracturing construction of table 1 TK1078 well
Fitting result from pressing, this repeats acid fracturing and dynamically stitches and reached 216m, has increased more for the first time 91.7m; Effectively acid etching seam has reached 169m, has increased more for the first time 68m; Seam height is 80m, has increased more for the first time 6.9m.
Fig. 6 produces curve map after TK1078 well is pressed, and as seen from Figure 6, by the end of April 10, this well 5mm oil nozzle was produced, oil pressure 12.7MPa, day production fluid 148.6m
3, day produce oil 148.5m
3, not moisture, after this acid fracturing, accumulative total produce oil is 10,000 tons.
To the acid fracturing construction for the first time of TH12137 well and effect
In acid fracturing work progress, involved liquid is composed as follows for the first time, and following percentage if no special instructions, all refers to quality %.
Linear glue: the fracturing fluid goods that the model that adopts the HB-YL201 of underground work group of North China petroleum office pressure break team to sell is JXG-T, it consists of: 20%HCl+0.5%JXG-T melon glue (superfine) (guar gum hydroxypropyl-trimethyl ammonium chloride)+0.02%PH value conditioning agent+1.0%HS-308 demulsifier+1.0%ZH-5 cleanup additive+0.5%SRD-Y temperature stability agent+1.0%SNW-Y clay stabilizer, all the other are water.
Frozen glue: the OB-YS organic borate cross-linker that above-mentioned linear glue+Xinjiang Luntai County Li Ke oilfield technology Services Co., Ltd sells, crosslinked ratio is 100: 0.6 (volume ratio of above-mentioned linear glue and crosslinking agent).
Gel acid: the gel acid goods that the model that adopts Kai Mu Tyke, Beijing petroleum works Technology Dev Company Ltd. to sell is CT-S, it consists of: 20%HCl+0.8%CT-S gelling agent+2.0%CT-H corrosion inhibiter+1.0%CT-Z cleanup additive+1.0% ferrous stability+1.0%CT-P demulsifier, all the other are water.
Displacement fluid: adopt above-mentioned linear glue.
It should be noted that, linear glue used herein, frozen glue, gel acid are all the conventional reagent in this area, therefore, conventional those reagent as pH value conditioning agent, demulsifier, cleanup additive, temperature stability agent, clay stabilizer, crosslinking agent, gelling agent, bactericide, high-temperature corrosion inhibitor and ferrous stability in every this area all can be used in the application.For example, gelling agent can be butyl acrylate, and corrosion inhibiter can be KI, and ferrous stability can be ascorbic acid, demulsifier can be SYNPERONIC PE/F68, and cleanup additive can be for forming APES as described in example 1 above.
Zu Heying mountain, a room of TH12137 well group 5842.62～5932m well section is carried out acid fracturing construction.Fig. 7 is TH12137 well acid fracturing construction curve figure for the first time.Clamp-on stratum total pressure break liquid measure 633m
3(wherein successively add successively linear glue 26m
3, frozen glue 300m
3, high temperature gel acid 280m
3, linear glue 27m
3linear glue, fracturing fluid gel and gel acid conventional in acid-fracture technology all can be used for herein), 30.1 ↓ 28.1MPa falls in termination of pumping pressure measurement.Production fluid declines fast, stage accumulative total production fluid 173t, produce oil 125t.Rear pilot flood 494m
3, inject difficulty, after driving a well, producing 4 is stop-spraying, accumulative total production fluid 84t after water filling, produce oil 70t.Blowing accumulative total production fluid 257t, produce oil 195t.
After this well because energy shortage well workover turns oil well pump, produce, well workover leakage well killing fluid 110m
3, turn and take out rear production fluid fluctuation decline, sporadicly moisture.Subsequently, the second round pilot flood is for oil, and maximum pressure 12.5MPa between the flood period, adds up water filling 404m
3.After closing well 21 days, day at the initial stage production fluid 12t that drives a well, not moisture, after water breakthrough, moisture fluctuation is risen, and eventually because of the moisture closing well of height, second takes turns after water filling totally production fluid 289t, produce oil 232t.Tired production fluid 642t, tired produce oil 517t, tired water filling 898m
3.
Adopt the operation similar with the extensive repetition acid fracturing method of embodiment 1, system in Tahe Oilfield TH12317 well has been implemented again to extensive repetition acid fracturing field trial, also obtained better effects, describe operating procedure in detail as follows.
TH12137 well large-scale is repeated to acid fracturing construction (large-scale compound acid fracturing)
Liquid involved in following repetition acid fracturing work progress is composed as follows, and following percentage if no special instructions, all refers to quality %.
Slippery water: 0.45% melon glue+0.1% bactericide, all the other are water; When carrying powder pottery, add 0.6 volume % crosslinking agent.
Wherein, described melon glue is the conventional guar gum hydroxypropyl-trimethyl ammonium chloride in this area, the conventional bactericide in this area all can be used in the application's scheme, the XJ-glutaraldehyde oil field bactericide (glutaraldehyde >=15%, the dodecyl dimethyl benzyl ammonium chloride: >=15%) that in following examples, use Hubei Xinjing New Material Co., Ltd. to sell.
Crosslinking agent: the OB-YS organic borate cross-linker that Luntai County, Xinjiang Li Ke oilfield technology Services Co., Ltd sells, the conventional organic borate cross-linker in this area all can be used in the application.
Acid becomes sticky: the sour goods that become sticky that the model that adopts Beijing KeMaiShi Oil Field Chemical regent Technology Co., Ltd to sell is KMS-50, it consists of: 20%HCl+0.8%KMS-50 sour gelling agent+2.0%KMS-6 corrosion inhibiter+1.0%KMS-7 ferrous stability+1.0%FRZ-4 demulsifier+1.0%HSC-25 cleanup additive+0.5%KMS-50H acid activators that becomes sticky that becomes sticky, all the other are water.
Gel acid: adopt Xinjiang to think the gel acid goods that the outstanding model of selling of grace is XC-107, it consists of: 20%HCl+0.8%XC-107 gel acid gelling agent+2.0%XC-13 corrosion inhibiter+1.0%XC-16 ferrous stability+1.0%XC-08 demulsifier+1.0%XC-07 cleanup additive, all the other are water.
It should be noted that, the conventional reagent as bactericide, crosslinking agent, gelling agent, corrosion inhibiter, ferrous stability, demulsifier, cleanup additive and activator in this area all can be used in the application.For example, gelling agent can be butyl acrylate, corrosion inhibiter can be KI, ferrous stability can be ascorbic acid, demulsifier can be SYNPERONIC PE/F68, cleanup additive can be for forming APES as described in example 1 above, and activator can be buserelin.
TH12137 well has been implemented to extensive repetition acid fracturing construction, and Fig. 8 repeats to implement acid fracturing construction curve figure to TH12137 well.Operation process discharge capacity is at 0.65-9.13m
3/ min, pump pressure 27.6-85.0MPa, is successively just squeezing slippery water totally 10 times, and accumulative total is clamp-oned the total liquid measure 3800m in stratum
3, just squeezing that the smooth water yield is respectively 300,100,300,100,200,200,200,200,1000,500m for these 10 times
3, front 9 just crowded smooth water yields add up to 2600m
3.
Wherein, in the middle of the operation of the 9th time and the 10th time just crowded slippery water, by oil pipe, just squeezing the sour 400m that becomes sticky respectively successively
3with gel acid 300m
3, when just squeezing slippery water the 2nd, 4,6,8 times, add respectively 6,6,12, the 100 order powder potteries of 12t and each 0.6% crosslinking agent (herein " each 0.6% crosslinking agent " refer to added crosslinking agent the 2nd, 4,6,8 each times volume ratio in just crowded slippery water).Just squeezing while becoming sticky acid, in this becomes sticky acid, adding (the ethyl acyl ammonium) 2t that has activator, additional proportion (activator quality t/ sour volume m that becomes sticky that is 0.5%
3); The object that adds activator (ethyl acyl ammonium) is to delay sour rock reaction, extends acid solution reflecting time, increases fracture length, and the effect of just squeezing slippery water for the 10th time is the acid solution of injecting to be driven to as far as possible to the end in crack, increases acid etching seam long; The object of just squeezing gel acid is the crack of processing nearly pit shaft, increases its flow conductivity, does not add activator (ethyl acyl ammonium) and contributes to sour rock fast reaction; 30.5 ↓ 29.5MPa falls in termination of pumping pressure measurement.
From the construction curve of Fig. 8, can find out, front 9 stages just squeezing during slippery water oil jacket press stable and both approach, show just constantly to make seam; During just squeezing become sticky acid and gel acid, oil pressure (pump pressure) raises relatively reposefully, and casing pressure reduces relatively reposefully; The 10th high discharge capacity of stage is just being squeezed slippery water 500m
3during this time, just squeeze the final stage of displacement fluid, oil jacket is pressed stable and both are approaching.Construction termination of pumping pressure 30.5 ↓ 29.5MPa, acid fracturing is processed more for the first time reduction by a relatively large margin, totally shows that this repeats the favourable Reservoir Body that well far away area has been linked up in acid fracturing construction.As mentioned above, at above-mentioned TH12137 well, repeat in acid fracturing construction technology, displacement fluid used is slippery water.Wherein, related experiment data are in Table 2 and table 3.
The large-scale repetition acid fracturing of table 2 Tahe TH12137 well field conduct statistical form
Rear fitting result comparative analysis situation is pressed in twice acid fracturing construction of table 3TH12137 well
Fig. 9 produces curve map after TH12137 well is pressed, as seen from Figure 9, and the construction of TH12137 well acid fracturing on May 25, day at initial stage produce oil 72t (moisture 5.7%), day produce oil 40.0t (moisture 0.65%) after stable, by the end of September 19, accumulative total produce oil 0.5 * 10 after pressing
4t.By embodiment 1 and 2 above, can be drawn the following conclusions: for thering is the well of a plurality of Reservoir Bodies on reservoir principal direction of stress, can adopt large-scale Compound-acid compression technology to link up the Reservoir Body in farther scope, adopt the large-scale compound Acid Fracturing Technology that repeats of the present invention, broken through traditional acid fracturing technical thought, significant for the recovery ratio that improves seam hole type carbonate reservoir.Prepad fluid powder pottery slug can effectively reduce liquid leak-off, improves fracturing fluid width generation capacity; Significantly improving replacement liquid measure can be pushed into acid solution crack far-end, increases effective acid etching seam long.In sum, by method of the present invention, can horizontal communication apart from the seam hole type carbonate reservoir of the farther Reservoir Body of pit shaft, more than the length that has improved acid fracturing man made seam reaches 140m, thereby solved apart from pit shaft 200m scope and failed to link up pit shaft Reservoir Body far away with the conventional ACID FRACTURING TECHNOLOGY of inseam hole type Carbonate Reservoir, need to find by sidetracking the problem of new seam hole Reservoir Body.
Claims (8)
1. a large-scale compound acid fracturing method of stitching hole type carbonate reservoir, is characterized in that, it,, when a plurality of seams hole body around of the pit shaft of linking up reservoir, comprises following operation:
1) by oil pipe or oil jacket mixed water injection to the operation of injecting slippery water in stratum,
2) by oil pipe to the operation that adds powder pottery in stratum,
3) by oil pipe, to injecting acid solution in stratum, carry out the operation of acid filling for the first time, in operation 3) in, the acid of injecting is the acid that becomes sticky, it consists of: the 20%HCl+0.8% sour gelling agent butyl acrylate+2.0% high-temperature corrosion inhibitor KI+1.0% cleanup additive APES+1.0% ferrous stability ascorbic acid+1.0% demulsifier SYNPERONIC PE/F68+0.5% acid activators ethyl acyl ammonium that becomes sticky that becomes sticky, and all the other are water; Wherein said percentage is quality percentage composition;
4) by oil pipe, to injecting acid solution in stratum, carry out the operation of acid filling for the second time, in operation 4) in, the acid of injecting is gel acid, containing activator;
5) by oil pipe or oil jacket mixed water injection to the operation of injecting excessive displacement fluid in stratum, described displacement fluid is slippery water;
Wherein, described large-scale compound acid fracturing refers to the total liquid measure 2000m of construction
3above acid fracturing method;
Operation 1), 3) liquid, 4), 5) injecting accounts for the volume ratio that injects the total liquid in stratum and is respectively: operation 1), slippery water accounts for 50-75%, operation 3) and operation 4) in acid solution total amount account for 15-25%, operation 5) middle displacement fluid accounts for 10-25%; Operation 2) in operation 1) carry out when carrying out, the powder ceramic amount adding accounts for operation 1) in the volume ratio of slippery water be: 1.0-12.3%, wherein powder pottery mass unit be ton (t), operation 1) volume unit of middle slippery water is m
3,
Wherein, in described operation 3) and 4) between also comprise to the operation that re-injects slippery water in stratum.
2. according to the large-scale compound acid fracturing method of the seam hole type carbonate reservoir of claim 1, wherein, operation 5) in operation 4) carry out afterwards, or in operation 3) and operation 4) between carry out.
3. the operation of the large-scale compound acid fracturing method of seam according to claim 1 and 2 hole type carbonate reservoir, wherein, described operation 1) injecting slippery water in stratum comprises the operation of repeatedly injecting slippery water.
4. the operation that the large-scale compound acid fracturing method of seam according to claim 1 and 2 hole type carbonate reservoir, wherein, described operation 2) adds powder pottery in stratum comprises the operation that repeatedly adds powder pottery.
5. according to the large-scale compound acid fracturing method of the seam hole type carbonate reservoir described in any one in claim 1 or 2, wherein, operation 3) and operation 4) repeatedly hocket.
6. according to the large-scale compound acid fracturing method of the seam hole type carbonate reservoir described in any one in claim 1 or 2, while carrying out acid fracturing construction, adopt
oil pipe or 4 " oil pipes.
7. the large-scale compound acid fracturing method of seam according to claim 1 and 2 hole type carbonate reservoir, wherein, operation 2), powder pottery is 100 object haydites.
8. according to the large-scale compound acid fracturing method of the seam hole type carbonate reservoir described in any one in claim 1 or 2, wherein, in operation 1) in, described slippery water is oil field carbonate formation water+0.45% guar gum hydroxypropyl-trimethyl ammonium chloride, wherein said percentage is quality percentage composition; Described slippery water operational discharge capacity is 6.5～10.2m
3/ min.
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