CN106321053B - A kind of well production increment method - Google Patents

A kind of well production increment method Download PDF

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Publication number
CN106321053B
CN106321053B CN201510379255.8A CN201510379255A CN106321053B CN 106321053 B CN106321053 B CN 106321053B CN 201510379255 A CN201510379255 A CN 201510379255A CN 106321053 B CN106321053 B CN 106321053B
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crack
active water
discharge capacity
proppant
old
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CN106321053A (en
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蒋廷学
周林波
刘建坤
曲海
吴春方
李洪春
李奎为
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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Abstract

The present invention relates to a kind of well production increment methods, comprising: step 1 stops exploitation, analyzes and determines the reason of old fracture condudtiviy reduces;The method that old crack is repaired in the reason of step 2 is obtained according to step 1 selection;Step 3 determines construction parameter according to the method selected in step 2, restores the flow conductivity in old crack;Step 4 continues to exploit to oil/gas well;Wherein the old crack refers to the supporting crack formed after first time pressure break.The method provided according to the present invention, it is inexpensive, easy to operate, significantly restored without the old fracture condudtiviy that refracturing can be such that first time pressure break is formed, to improve yield.

Description

A kind of well production increment method
Technical field
The present invention relates to oil-gas field development fields, and in particular to a kind of well production increment method.
Background technique
Hydraulic fracturing is to increase the effective means of Low Permeability Oil/gas well production.The crack that first time hydraulic fracturing is formed, leads Stream ability often rapid decrement, or even forfeiture flow conductivity, to lose production-increasing function.
The main reason for fracture condudtiviy is successively decreased has several aspects, has plenty of the low (construction for the first time of whole flow conductivity Sand liquor ratio is low);Have plenty of nearly pit shaft fracture condudtiviy to lose or be greatly lowered (as crossed replacement, in horizontal well fracturing The reasons such as generally existing or formation sand production or proppant percentage of damage height result in blockage when construction);Has plenty of first time fracturing process Middle fracture height excessively extends on reservoir top or lower part, causes effective support of the proppant in reservoir few;Have plenty of and adopts Add sand design improper with slug formula, cause inner support agent support in crack discontinuous, interruption length is too long, because clossing pressure effect is made At the forfeiture of the fracture condudtiviy of no support section, so that subsequent supporting crack loses the contribution to yield after pressure.Due to this A little unfavorable factors, so that production decline is rapid after pressure.In order to improve yield again, sometimes have to take refracturing measure, Again plus sand (proppant) supporting crack, but the higher cost of refracturing, risk are also high.
Summary of the invention
Aiming at the shortcomings in the prior art, this application provides a kind of well production increment methods, are not necessarily to refracturing, pass through Fracturing fracture is repaired, restore and improves fracture condudtiviy, to improve oil gas well production.The method letter provided according to the present invention It is single, easy to operate, and advantage of lower cost.
According to the present invention, a kind of well production increment method is provided, comprising:
Step 1 stops exploitation, analyzes and determines the reason of old fracture condudtiviy reduces;
The method that old crack is repaired in the reason of step 2 is obtained according to step 1 selection;
Step 3 determines construction parameter according to the method selected in step 2, restores the flow conductivity in old crack;
Step 4 continues to exploit to oil/gas well;
Wherein the old crack refers to the supporting crack formed after first time pressure break.
Method according to the present invention, according to the different reasons that determining fracture condudtiviy reduces, selection and optimization Restorative procedure can greatly improve and restore fracture condudtiviy, additionally it is possible to make to have lost fracture condudtiviy Man-made fracture plays a role again, is then exploited again, and yield can be greatly increased.
The method provided according to the present invention, in step 1, the old fracture condudtiviy reduce the reason of include: entirety The reduction of flow conductivity, nearly pit shaft fracture condudtiviy are lost or are reduced, and the excessive extension and proppant support of fracture height are not It is at least one of continuous.The determination that old fracture condudtiviy reduces reason includes carrying out geology, construction technology to fractured well It is analyzed with fracture pattern, this point can be determined by those skilled in the art by analysis.
The method provided according to the present invention includes whole lead when the reason of old fracture condudtiviy reduces in step 2 When the reduction of stream ability, the method using closed acidization is selected.The method of the closed acidization includes that acid solution is injected into crack, And control the clossing pressure that bottom pressure is no more than crack.Acid solution is such as injected into crack with the small displacement of the side 0.2-2 per minute, The clossing pressure that bottom pressure is no more than crack is controlled and controls, so that crack is not opened.The method of closed acidization, utilizes acid solution Fingering effect, quickly within the scope of entire crack cloth acid.
One specific embodiment of the method provided according to the present invention, the acid solution are hydrochloric acid solution or mud acid liquid.Pass through acid Corrosion experimental configuration selects hydrochloric acid solution or mud acid liquid, when corrosion rate of the hydrochloric acid to reservoir rock mineral is greater than 20%, uses Hydrochloric acid solution;When corrosion rate of the hydrochloric acid to reservoir rock mineral is less than or equal to 20%, mud acid liquid is selected.Wherein, the acid solution Amount is 1-10 times of crevice volume.After injecting acid solution, closing well drives a well after waiting acid liquid reaction.The time of the closing well can lead to The hydrochlorate reaction speed for crossing measuring determines.
One preferred embodiment of the method provided according to the present invention, the hydrochloric acid solution include 5-28wt% hydrogen chloride, The corrosion inhibiter of 1-3wt% and the ferrous stability of 1-3wt%;And/or the mud acid liquid include 5-28wt% hydrogen chloride, The hydrogen fluoride of 0.5-5wt%, the corrosion inhibiter of 1-3wt%, the ferrous stability of 1-3wt% and the clay stabilizer of 1-3wt%. Wherein, the ingredient in the hydrochloric acid solution and mud acid liquid is known in the state of the art, and available reagent can be used as corrosion inhibiter, iron ion Stabilizer, clay stabilizer reagent be used equally for the present invention.Such as hydrochloric acid (aqueous solution of hydrogen chloride) or hydrofluoric acid (hydrogen fluoride Aqueous solution) it is commercially available and obtain;Remaining corrosion inhibiter (such as SRCI-2), ferrous stability (such as SRFS-1), clay stabilizer are (such as SRCS-2) it can be produced and be sold by petroleum works Institute for Research and Technology of Sinopec Group.
A specific embodiment of the method according to the present invention includes nearly well when the reason of old fracture condudtiviy reduction When cylinder fracture condudtiviy is lost or reduced, using active water is injected into crack, opens nearly pit shaft crack quickly, then stop It only injects, drive a well open flow immediately, and proppant when first time pressure break is made to flow back.By the proppant backflow, thus Very significantly restore or provide the fracture condudtiviy of nearly pit shaft.For example, 1-2 platform cementing truck can be used, allowed with cementing truck Highest discharge capacity active water is injected into crack, allow nearly pit shaft crack quickly to open, then termination of pumping, drive a well open flow immediately.
According to the present invention, the active water includes fracturing fluid gelatinizer, clay stabilizer and water.In a specific implementation In example, the active water includes the water of the fracturing fluid gelatinizer of 0.1-1wt%, the clay stabilizer of 0.2-2wt% and surplus.Institute It states compression fracture thickening agent (such as SRFP-1) and reagent well known in the prior art can be used in clay stabilizer (such as SRCS-1), such as in The reagent that petroleum works Institute for Research and Technology of petrochemical industry limited liability company of state produces and sells.In a specific example, The amount of the active water of the injection is 2-20 times of crevice volume.By taking volume is the crack of 5 sides as an example, the amount of the active water of addition For the side 10-100.
According to the present invention, open flow liquid measure is determined according to the reason of causing nearly pit shaft flow conductivity to lose or reduce.When When crossing replacement nearly pit shaft flow conductivity being caused to lose or reduce, open flow amount was not higher than the total of the active water of replacement amount and injection (namely the summation of replacement amount and the active water of injection is more than or equal to open flow amount excessively), the proppant backflow to crack mouthful. When nearly well crack, blocking causes nearly pit shaft flow conductivity to lose or reduce, open flow amount is calculated according to plug depth, will block section Proppant backflow to pit shaft.
The reason of another specific embodiment of the method according to the present invention, the old fracture condudtiviy reduces, wraps Include: the excessive extension of fracture height, wherein it is described it is excessive extend include a it is excessive on prolong it is excessively downward with b.
It under a situation, using active water is injected into crack, opens nearly pit shaft crack quickly, stops injection simultaneously later Closing well allows proppant when first time pressure break to fall after rise to effective reservoir height, and then drive a well open flow, promotes crack closure. Closed-in time calculates as follows: heavy by Stokes then under the conditions of active water according to data of the proppant in the interlayer of top Drop formula calculates proppant and falls the time into reservoir after rise, can be specifically calculated by those skilled in the art.It is specific at one In example, at this point, the amount of active water used is 2-20 times of crevice volume.By taking volume is the crack of 10 sides as an example, the work of addition Property water amount be the side 20-200.
Under b situation, when the excessively lower delay in crack, using active water is injected into crack, open nearly pit shaft crack quickly It opens, active water is injected using the change discharge capacity of pulsed later, the proppant for being deposited in bottom is rolled into the weight in entire crack New distribution, is supported on proppant again in effective reservoir height from migrating upwards in the interlayer of lower part, and active water injection finishes Afterwards, drive a well open flow immediately, promotes crack closure.After open flow to no liquid flows out, open flow amount is usually less than the active water injected Amount, open flow finish.The amount of the active water injected at first is 1-10 times (such as side 10-60) of crevice volume, later, the pulsed Change discharge capacity injection when active water amount into 2-20 times (such as side 20-200) of crevice volume.Herein, the change of the pulsed Discharge capacity injection refers to that quickly alternately variation injection, each discharge capacity stablize time 5-300s, high every point of the discharge capacity side 2-5 with height discharge capacity Clock, low discharge capacity are that the side 0.2-1 is per minute.
Another specific embodiment of the method according to the present invention, the old fracture condudtiviy reduce the reason of include Proppant support is discontinuous, and using active water is injected into crack, after active water open fracture, the change discharge capacity of pulsed, which is injected, lives Property water, cause the migration again of original proppant in crack to lay, the proppant at original different slugs connect to some extent It picks up and, original invalid support is become effectively to support, after active water injects, drive a well open flow immediately, and crack is promoted to close It closes.The amount of the active water injected at first is 1-10 times (such as 10-100, the preferably side 10-30) of crevice volume, later, the change row The amount for measuring the active water of injection is 2-20 times (such as side 20-200) of crevice volume.The pulsed change discharge capacity injection refer to Quickly alternately variation injection, each discharge capacity stablize time 5-300s to height discharge capacity, and the high discharge capacity side 2-5 is per minute, and low discharge capacity is The side 0.2-1 is per minute.After open flow to no liquid flows out, open flow amount is usually less than the active water injected, and open flow finishes.Ability Field technique personnel can be seen that proppant support, and discontinuously to cause old fracture condudtiviy to reduce excessive downward with fracture height Cause old fracture condudtiviy to reduce, this twice situation when processing method be it is similar, existing experimental data proves the processing Method is all effective to above two situation.But proppant support is only listed in following example and discontinuously causes old fracture guide Experimental data when ability reduces.
The method provided according to the present invention, it is inexpensive, easy to operate, first time pressure break can be made to be formed without refracturing Old fracture condudtiviy is significantly restored, to improve yield.Method provided by the invention can be widely used for having pressed The reparation in old crack is split, the man-made fracture for having lost fracture condudtiviy can be made to play a role again.
Detailed description of the invention
Illustrate the present invention below in conjunction with attached drawing.
Fig. 1 is 1a and 1b schematic diagram after reparation before 1 crack of embodiment is repaired;
Fig. 2 is 2a and 2b schematic diagram after reparation before 2 crack of embodiment is repaired;
Fig. 3 is 3a and 3b schematic diagram after reparation before 3 crack of embodiment is repaired;
Fig. 4 is 4a and 4b schematic diagram after reparation before 4 crack of embodiment is repaired.
The meaning of appended drawing reference is as follows in figure: 1 pit shaft;2 oil reservoir boundaries;3 proppants;Filler is polluted between 4 proppants.
Specific embodiment
To keep the present invention easier to understand, below in conjunction with embodiment and attached drawing, the present invention will be described in detail, these realities Apply example only serve it is illustrative, it is not limited to application range of the invention.
Fracturing fluid gelatinizer (SRFP-1), the 0.2- comprising 0.1-1wt% of active water used in following embodiment The water of clay stabilizer (SRCS-1) and surplus of 2wt%.Although in following embodiments, only being provided used in one under every kind of situation Active water amount, but those skilled in the art could be aware that, the active water that the present invention limits the other amounts in range also can Realize the present invention.
Embodiment 1:
As shown in Figure 1, the crack that pressure break is formed is filled by shale pollutant, cause whole flow conductivity low, Liquid output is 1.5 sides/day.Take under the premise of crack is not opened, with 0.3 side of discharge capacity/minute, squeeze into mud acid liquid 12wt% hydrogen chloride, The hydrogen fluoride of 3wt%, the corrosion inhibiter (SRCI-2) of 1wt%, 1wt% ferrous stability (SRFS-1) and 1wt% clay Stabilizer (SRCS-2), dosage are 1 times of crevice volume, i.e. 12 sides, the viscosity of mud acid liquid is low, can be quickly in entire crack range Interior cloth acid.
After shale pollutant corrosion releases, flow conductivity increases, and Liquid output increases to 6.0 sides/day.
Embodiment 2:
As shown in Fig. 2, first time pressure break causes nearly pit shaft fracture condudtiviy low due to crossing 5 sides of replacement, Liquid output 2.1 Side/day.With 2 cementing trucks, with 2.3 sides of discharge capacity/minute, active water (dosage is 2 times of crevice volumes, 10 sides) is injected, allows crack It quickly opens, termination of pumping immediately simultaneously takes well head open flow, altogether 15 side of open flow.Crack inner support agent flows back, and nearly wellbore support is good, Flow conductivity reparation, Liquid output increase to 6.8 sides/day.
Embodiment 3:
As shown in figure 3, first time pressure-break height is out of control, part proppant does not play a role inside reservoir, Liquid output 2.8 sides/day.Active water (dosage is 3 times of crevice volumes, 15 sides) is injected, allows and splits with 2.2 sides of discharge capacity/minute with 2 cementing trucks Seam quickly opens, and termination of pumping immediately waits proppant to settle 25 minutes, then the 2 side's liquid of open flow that drives a well.Reservoir upper support agent reflux, Reservoir internal fissure flow conductivity increases, and Liquid output increases to 8.0 sides/day.
Embodiment 4:
As shown in figure 4, first time fracturing section plug adds sand improper, cause crack inner support agent discontinuous, flow conductivity is low, 1.8 sides of Liquid output/day.First inject active water into crack, after active water open fracture, (dosage is 1 times to 5 side's active waters of injection Crevice volume, 5 sides);Then with 2 cementing trucks, with 2.5 sides of maximum pump discharge/minute, 0.2 side of minimum injection rate/minute, pulsed Change discharge capacity measure inject active water (dosage is 4 times of crevice volumes, 20 side), drive a well open flow immediately, 3 side's liquid of well head open flow Afterwards, promote entire crack quick-make.Continuous flow conductivity is restored in reservoir inner support agent redistribution, crack, and Liquid output increases It is added to 7.8 sides/day.
The method provided according to the present invention, by analyze understand master control that first time fracturing fracture flow conductivity falls sharply because Element will take different be directed to for different situations after first time fracture support form and failure cause analysis understand Property reclamation activities, the flow conductivity in crack is restored in easy, low cost reparation crack, for a kind of simply, efficiently volume increase side Method.
It should be noted that embodiment described above for explaining only the invention, is not constituted to of the invention any Limitation.By referring to exemplary embodiments, invention has been described, it should be appreciated that word used in it is descriptive With explanatory vocabulary, rather than limited vocabulary.The present invention can be made within the scope of the claims by regulation Modification, and the present invention is revised in without departing substantially from scope and spirit of the present invention.Although the present invention described in it relates to And specific method, material and embodiment, it is not intended that the present invention is limited to particular case disclosed in it, on the contrary, this hair It is bright to can be extended to other all methods and applications with the same function.

Claims (9)

1. a kind of well production increment method, comprising:
Step 1 stops exploitation, analyzes and determines the reason of old fracture condudtiviy reduces;
The method that old crack is repaired in the reason of step 2 is obtained according to step 1 selection;
Step 3 determines construction parameter according to the method selected in step 2, restores the flow conductivity in old crack;
Step 4 continues to exploit to oil/gas well;
Wherein the old crack refers to the supporting crack formed after first time pressure break;In step 1, the old fracture condudtiviy The reason of reduction includes: the reduction of whole flow conductivity, and nearly pit shaft fracture condudtiviy is lost or reduced, fracture height it is excessive At least one of extension and proppant support are discontinuous;
In step 2, when the reason of old fracture condudtiviy reduction includes the reduction of whole flow conductivity, selection is used and is closed The method for closing acidification;
When including that nearly pit shaft fracture condudtiviy is lost or reduced when the reason of old fracture condudtiviy reduces, using into crack Active water is injected, opens nearly pit shaft crack quickly, then stops injection, drive a well open flow immediately, makes branch when first time pressure break Support agent flows back.
2. the method according to claim 1, wherein the method for the closed acidization includes injecting acid into crack Liquid, and control the clossing pressure that bottom pressure is no more than crack.
3. according to the method described in claim 2, it is characterized in that, the acid solution be hydrochloric acid solution or mud acid liquid, and/or, it is described The amount of acid solution is 1-10 times of crevice volume.
4. according to the method described in claim 3, it is characterized in that, the hydrochloric acid solution includes the hydrogen chloride of 5-28wt%, 1- The corrosion inhibiter of 3wt% and the ferrous stability of 1-3wt%;And/or the mud acid liquid includes the hydrogen chloride of 5-28wt%, 0.5- The hydrogen fluoride of 5wt%, the corrosion inhibiter of 1-3wt%, the ferrous stability of 1-3wt% and the clay stabilizer of 1-3wt%.
5. causing nearly pit shaft flow conductivity to lose or reduce the method according to claim 1, wherein having served as replacing When, open flow amount was not higher than the summation of the active water of replacement amount and injection, the proppant backflow to crack mouthful;When nearly well is split When seam blocking causes nearly pit shaft flow conductivity to lose or reduce, open flow amount is calculated according to plug depth, will block the proppant of section It is back to pit shaft.
6. method described in any one of -5 according to claim 1, which is characterized in that the old fracture condudtiviy reduced Reason includes: the excessive extension of fracture height, it is described it is excessive extend include a it is excessive on prolong it is excessively downward with b;
It under a situation, using active water is injected into crack, opens nearly pit shaft crack quickly, stops injection and closing well later, Proppant when first time pressure break is allowed to fall after rise to effective reservoir height, then drive a well open flow, promotes crack closure;
Under b situation, when the excessively lower delay in crack, using active water is injected into crack, open nearly pit shaft crack quickly, it Active water is injected using the change discharge capacity of pulsed afterwards, the proppant for being deposited in bottom is rolled and is divided again in entire crack Cloth is supported on proppant again in effective reservoir height from migrating upwards in the interlayer of lower part, after active water injects, stands Drive a well open flow, promotes crack closure.
7. according to the method described in claim 6, it is characterized in that, the closed-in time calculates as follows: according to support when under a situation Data of the agent in the interlayer of top calculate proppant by Stokes sedimentation formula and fall after rise into storage then under the conditions of active water The time of layer;And/or
Under b situation, the change discharge capacity injection of the pulsed refers to that quickly alternately variation injection, each discharge capacity are steady with height discharge capacity Fix time 5-300s, and the high discharge capacity side 2-5 is per minute, and low discharge capacity is that the side 0.2-1 is per minute.
8. method described in any one of -5 according to claim 1, which is characterized in that the old fracture condudtiviy reduced Reason includes that proppant support is discontinuous, and using active water is injected into crack, after active water open fracture, the change of pulsed is arranged Amount injection active water, causes the migration again of original proppant in crack to lay, different by the proppant at original different slugs It connects to degree, original invalid support is become effectively to support, after active water injects, drive a well open flow immediately, promotees Make crack closure.
9. according to the method described in claim 8, it is characterized in that, the change discharge capacity injection of the pulsed refers to height discharge capacity Quickly alternately variation injection, each discharge capacity stablize time 5-300s, and the high discharge capacity side 2-5 is per minute, and low discharge capacity is every point of the side 0.2-1 Clock.
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CN108661611A (en) * 2017-04-01 2018-10-16 中国石油化工股份有限公司 A kind of Reservoir behavior flooding method
CN111219176B (en) * 2020-01-09 2020-09-04 成都合信恒泰工程技术有限公司 Water injection well expansion reservoir transformation method
CN115199252B (en) * 2022-06-07 2024-07-12 中国地质调查局水文地质环境地质调查中心 Dry-hot rock vertical well reservoir transformation method under tensile structural stress environment

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