CN105569605B - A kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate - Google Patents

A kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate Download PDF

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Publication number
CN105569605B
CN105569605B CN201510927913.2A CN201510927913A CN105569605B CN 105569605 B CN105569605 B CN 105569605B CN 201510927913 A CN201510927913 A CN 201510927913A CN 105569605 B CN105569605 B CN 105569605B
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water
sleeve pipe
pressure
shut
chemical
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CN105569605A (en
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朱家杰
杨海恩
陈洪涛
徐春梅
张涛
张�荣
马国伟
吴天江
任建科
薛芳芳
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like

Abstract

The invention provides a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate, including step：A, shut-in pressure P before constructing is read1With sleeve pipe open flow flow Q1；B, injection test clear water, water is full of tubing and casing, try sleeve pipe and sleeve valve and pressure testing；C, chemical plugging agent slug I polymer phenolic aldehyde gel is noted；D, chemical plugging agent slug II Weak gel particle is noted；E, chemical plugging agent slug III high intensity curing system is noted；F, positive and negative crowded displacement fluid；G, closing well is waited solidifying；If h, shut-in pressure and sleeve pipe open flow flow substantially do not reduce, return to step c and repeat untill shut-in pressure and sleeve pipe open flow flow substantially reduce, terminate note blocking agent；I, rise and measure tubing string, with gauguste cutter drifting to artificial bottom of a well；If being hampered, lower scraper, junk mill handle pit shaft to shaft bottom；J, tripping in flow string and pump, which are opened, takes out.The present invention can effectively improve oilwell water shutoff success rate, avoid the blindness of directly lower pump production after plug water construction.

Description

A kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate
Technical field
The invention belongs to technical field of petroleum industry, is related to the low permeability fractured type oil reservoir improved in oil recovery factor technology Oilwell water shutoff method, specifically a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate.
Background technology
Low permeability fractured oil field long-term injecting water is developed and influenceed by formation fracture, and the anisotropism on stratum is serious, note Enter water along the channelling of Thief zone crack, cause oil well to enter High water cut production phase, or even rapid water logging, have impact on crude oil extraction journey Degree, and the processing of production fluid, the cost for considerably increasing oil recovery.Therefore how water-yielding stratum is effectively blocked, control oil Well moisture content rises, and keeps oilfield stable production and volume increase, turning into high water-cut reservoir development process to solve the problems, such as.
Oil field is often to take process matched therewith measure to reservoir injection chemical plugging agent closure high permeability zone with chemical water shutoff method Or high yield water layer, realize the purpose of oil well liquid-producing control water.Publication No. CN101787864A patent document discloses a kind of low Reservoir waterflooding reservoir Fractured water logging oil well shutoff method is oozed, it uses cementing truck or fracturing unit truck by four kinds of varying strength blocking agents Stratum is squeezed into respectively, finally injects displacement fluid, waits lower pump production after coagulating.Also Publication No. CN86108877A, it is entitled The patent document of " Zirconium gel water sealing agent ".
Different blocking agent slugs are injected separately into oil well by these existing water-plugging technologies, are replaced and are waited the i.e. lower pump production of condensation beam, only Measure effect can be observed by later stage production, and success rate is limited, typically 30% or so.Document above be not directed to as What improves the specific method of chemical water plugging of oil well success rate.
The content of the invention
The purpose of the present invention is to propose to one kind to be applied to low permeability fractured type oil reservoir chemical water plugging of oil well method, to improve oil Well chemical water shutoff success rate, oil well is administered, reduction oil well production is aqueous, recovers yield.
The technical scheme is that：A kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate, Comprise the following steps：
A, shut-in pressure P before constructing is read1With sleeve pipe open flow flow Q1；
B, injection test clear water, water is full of tubing and casing, try sleeve pipe and sleeve valve, ensure that sleeve pipe is full of clear water, and pressure testing, no Thorn is not leaked to be qualified；
C, chemical plugging agent slug I polymer phenolic aldehyde gel is noted；
D, chemical plugging agent slug II Weak gel particle is noted；
E, chemical plugging agent slug III high intensity curing system is noted；
F, positive and negative crowded displacement fluid；
G, closing well is waited solidifying after replacing；
H, wait after condensing beam, read shut-in pressure P after construction2With sleeve pipe open flow flow Q2If shut-in pressure and sleeve pipe open flow Flow does not substantially reduce, then returns to step c, notes blocking agent, Hou Ning again, until shut-in pressure and sleeve pipe open flow flow substantially drop Untill low, note blocking agent can terminate；The criterion that wherein shut-in pressure and sleeve pipe open flow flow substantially do not reduce is：P2≥ 0.5P1Or Q2≥0.5Q1；The criterion that shut-in pressure and sleeve pipe open flow flow substantially reduce is：P2＜ 0.5P1And Q2＜ 0.5Q1；
I, measure tubing string is played out after the completion of constructing, with gauguste cutter drifting, drifting to artificial bottom of a well；If being hampered, lower scraper, Junk mill handles pit shaft to shaft bottom；
J, tripping in flow string and pump, which are opened, takes out.
The amount of injection test clear water is 30m in above-mentioned steps b3, pressure test pressure 25MPa；Chemical plugging agent slug I is noted in step c The amount of polymer phenolic aldehyde gel is 300m3；The amount that chemical plugging agent slug II Weak gel particle is noted in step d is 300m3；In step e The amount for noting chemical plugging agent slug III high intensity curing system is 100m3；Each 30m of amount of positive and negative crowded displacement fluid in step f3；Step g In, closing well waited the solidifying time as 24 hours after replacement.
Polymer phenolic aldehyde gel is water-soluble for 0.3% anion hydrolyzed polyacrylamide by mass ratio in above-mentioned steps c Liquid, the 0.2% methenamine aqueous solution and 0.02% resorcinol aqueous solution mixing composition.
High intensity curing system is superfine cement in above-mentioned steps e, and the grain diameter of the superfine cement is less than 10 microns； The concentration of the superfine cement is 12%, i.e., the mass percent that the superfine cement accounts for its mixture formed with water is 12%.
Shut-in pressure and sleeve pipe open flow flow substantially reduce in above-mentioned steps h, then are judged as accomplishing the end in view, water blockoff into Power gets a promotion.
Beneficial effects of the present invention：The present invention judges whether oilwell water shutoff is tied by shut-in pressure and sleeve pipe open flow speed Beam, lower pump production in next step is carried out, oilwell water shutoff success rate can be effectively improved, avoid directly lower pump production after plug water construction Blindness, the present invention can effectively improve fractured reservoir chemical water plugging of oil well success rate, water outlet position can effectively be blocked, after forcing Continuous injection water runs into fluid diversion after blocking barrier near oil well, starts low-permeability layer and improves oily well yield.
The present invention is described in further details below with reference to embodiment.
Embodiment
It is including as follows the invention provides a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate Step：
A, shut-in pressure P before constructing is read1With sleeve pipe open flow flow Q1；
B, injection test clear water, water is full of tubing and casing, try sleeve pipe and sleeve valve, ensure that sleeve pipe is full of clear water, and pressure testing, no Thorn is not leaked to be qualified；
C, chemical plugging agent slug I polymer phenolic aldehyde gel is noted；
D, chemical plugging agent slug II Weak gel particle is noted；
E, chemical plugging agent slug III high intensity curing system is noted；
F, positive and negative crowded displacement fluid；
G, closing well is waited solidifying after replacing；
H, wait after condensing beam, read shut-in pressure P after construction2With sleeve pipe open flow flow Q2If shut-in pressure and sleeve pipe open flow Flow does not substantially reduce, then returns to step c, notes blocking agent, Hou Ning again, until shut-in pressure and sleeve pipe open flow flow substantially drop Untill low, note blocking agent can terminate；The criterion that wherein shut-in pressure and sleeve pipe open flow flow substantially do not reduce is：P2≥ 0.5P1Or Q2≥0.5Q1；The criterion that shut-in pressure and sleeve pipe open flow flow substantially reduce is：P2＜ 0.5P1And Q2＜ 0.5Q1；
I, measure tubing string is played out after the completion of constructing, with gauguste cutter drifting, drifting to artificial bottom of a well；If being hampered, lower scraper, Junk mill handles pit shaft to shaft bottom；
J, tripping in flow string and pump, which are opened, takes out.
The amount of injection test clear water is 30m in wherein step b3, pressure test pressure 25MPa；Chemical plugging agent slug I is noted in step c The amount of polymer phenolic aldehyde gel is 300m3；The amount that chemical plugging agent slug II Weak gel particle is noted in step d is 300m3；In step e The amount for noting chemical plugging agent slug III high intensity curing system is 100m3；Each 30m of amount of positive and negative crowded displacement fluid in step f3；Step g In, closing well waited the solidifying time as 24 hours after replacement.
Polymer phenolic aldehyde gel is water-soluble for 0.3% anion hydrolyzed polyacrylamide by mass ratio in wherein step c Liquid, the 0.2% methenamine aqueous solution and 0.02% resorcinol aqueous solution mixing composition.
High intensity curing system is superfine cement in wherein step e, and the grain diameter of the superfine cement is less than 10 microns； The concentration of the superfine cement is 12%, i.e., the mass percent that the superfine cement accounts for its mixture formed with water is 12%.
Shut-in pressure and sleeve pipe open flow flow substantially reduce in wherein step h, then are judged as accomplishing the end in view, water blockoff into Power gets a promotion.
In order that the object of the invention, technical scheme key are clearer, below to by example to this programme embodiment It is described in further detail.
Certain low-permeability fissured oil reservoir oil well embodiment：
A, shut-in pressure P is read before noting blocking agent1For 8MPa, sleeve pipe open flow flow Q1For 0.5m3/h；
B, injection test clear water 30m3, and pressure testing 25MPa, do not pierce and do not leak；
C, slug I is injected：Polymer phenolic aldehyde gel 300m3(the Wu Luotuo of 0.3% anion hydrolyzed polyacrylamide+0.2% The resorcinol of product+0.02%), injection discharge capacity 4m3/h；
D, slug II is injected：Weak gel particle 300m3(concentration 0.5%, being purchased from Xi'an length celebrating Chemical Group outside has Limit company), injection discharge capacity 4m3/h；
E, slug III is injected：High intensity curing system 100m3(superfine cement, concentration 12%).Inject discharge capacity 4m3/ h；
F, slug IV is injected：Positive and negative crowded displacement fluid 30m3(0.1% polymer solution).Inject discharge capacity 4m3/h；
G, positive and negative each 30m of crowded displacement fluid3；
H, closing well is waited solidifying 24 hours after replacing；
I, wait after condensing beam, read shut-in pressure P after construction2For 5MPa and sleeve pipe open flow flow Q2For 0.3m3, front and rear pass Well pressure and sleeve pipe open flow flow are without substantially reduction (P2≥0.5P1Or Q2≥0.5Q1) step c is then returned to, note is stifled again Agent；
J, slug I polymer phenolic aldehyde gel 300m is refilled in accordance with step c3；
K, repeat step d；
L, repeat step e；
M, repeat step f；
N, repeat step g；Positive and negative each 30m of crowded displacement fluid3；
O, repeat step h；Closing well is waited solidifying 24 hours after replacement；
P, wait after condensing beam, read shut-in pressure P after construction2For 3MPa and sleeve pipe open flow flow Q2For 0.2m3, front and rear pass Well pressure and sleeve pipe open flow flow substantially reduce (P2＜ 0.5P1And Q2＜ 0.5Q1), meet to require, construction terminates；
Q, measure tubing string is played out after the completion of constructing, with gauguste cutter drifting, drifting to artificial bottom of a well；If being hampered, lower scraper, Junk mill handles pit shaft to shaft bottom；
R, tripping in flow string and pump are opened and taken out on request.
To sum up, the present invention has given full play to the advantages of water shutoff in oil well, and it is mainly by polymer phenolic aldehyde gel and gel Successively injection oil well, blocking agent preferentially enter high permeability zone for particle, high intensity curing system, and high intensity curing system is by gel particle Seal up for safekeeping in high permeability zone.When the water (injection water, side water etc.) of the displacement of reservoir oil approaches oil well along high permeability zone, now gel particle rises To the effect for stopping water, compel to bring it about changed course so as to improve sweep area, reach water blockoff displacement of reservoir oil purpose.Its design is as follows：
First stage：Blocking agent is noted, blocking agent is implanted sequentially according to following slug, improves operation pressure；
Slug I：Blocked using the microcrack and matrix of polymer phenolic aldehyde gel fracture distal end；
Slug II：Using Weak gel particle, crack is filled, blocks hypertonic band；
Slug III：Sealed using high intensity curing system fracture, prevent blocking agent is counter from telling；
Slug IV：Using active water is replaced, blocking agent plastic in oil pipe is prevented.
Second stage：Closing well is waited solidifying 24 hours；
Phase III：Wait after condensing beam, water blockoff success or not is judged by shut-in pressure and sleeve pipe open flow speed, if closing Well pressure and sleeve pipe open flow speed substantially do not reduce, then return to the first stage, note blocking agent, Hou Ning again, until shut-in pressure Untill substantially being reduced with sleeve pipe open flow speed.
The present invention judges whether oilwell water shutoff terminates by shut-in pressure and sleeve pipe open flow speed, carries out lower pump in next step Production, can effectively improve oilwell water shutoff success rate, avoid the blindness of directly lower pump production after plug water construction, and the present invention can have Effect improves fractured reservoir chemical water plugging of oil well success rate, can effectively block water outlet position, forces that to be subsequently implanted into water attached in oil well Nearly fluid diversion after running into blocking barrier, starts low-permeability layer and improves oily well yield.
There is no the known conventional means of the part category industry described in detail in present embodiment, do not chat one by one here State.It is exemplified as above be only to the present invention for example, do not form the limitation to protection scope of the present invention, it is every with this Same or analogous design is invented to belong within protection scope of the present invention.

Claims (5)

  1. A kind of 1. method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate, it is characterised in that including following step Suddenly：
    A, shut-in pressure P before constructing is read1With sleeve pipe open flow flow Q1；
    B, injection test clear water, water is full of tubing and casing, try sleeve pipe and sleeve valve, ensure that sleeve pipe is full of clear water, and pressure testing, do not pierce not Leak to be qualified；
    C, chemical plugging agent slug I polymer phenolic aldehyde gel is noted；
    D, chemical plugging agent slug II Weak gel particle is noted；
    E, chemical plugging agent slug III high intensity curing system is noted；
    F, positive and negative crowded displacement fluid；
    G, closing well is waited solidifying after replacing；
    H, wait after condensing beam, read shut-in pressure P after construction2With sleeve pipe open flow flow Q2If shut-in pressure and sleeve pipe open flow flow Substantially do not reduce, then return to step c, note blocking agent, Hou Ning again, until shut-in pressure and sleeve pipe open flow flow are substantially reduced to Only, note blocking agent can terminate；The criterion that wherein shut-in pressure and sleeve pipe open flow flow substantially do not reduce is：P2≥0.5P1 Or Q2≥0.5Q1；The criterion that shut-in pressure and sleeve pipe open flow flow substantially reduce is：P2＜ 0.5P1And Q2＜ 0.5Q1；
    I, measure tubing string is played out after the completion of constructing, with gauguste cutter drifting, drifting to artificial bottom of a well；If being hampered, lower scraper, junk mill Pit shaft is handled to shaft bottom；
    J, tripping in flow string and pump, which are opened, takes out.
  2. 2. a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate according to claim 1, its The amount of injection test clear water is 30m in middle step b3, pressure test pressure 25MPa；Chemical plugging agent slug I polymer phenolic aldehyde is noted in step c The amount of gel is 300m3；The amount that chemical plugging agent slug II Weak gel particle is noted in step d is 300m3；Chemical plugging agent is noted in step e The amount of slug III high intensity curing system is 100m3；Each 30m of amount of positive and negative crowded displacement fluid in step f3；In step g, replacement finishes Closing well waited the solidifying time as 24 hours afterwards.
  3. 3. a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate according to claim 1, its It is characterised by, polymer phenolic aldehyde gel is water-soluble for 0.3% anion hydrolyzed polyacrylamide by mass ratio in wherein step c Liquid, the 0.2% methenamine aqueous solution and 0.02% resorcinol aqueous solution mixing composition.
  4. 4. a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate according to claim 1, its It is characterised by, high intensity curing system is superfine cement in wherein step e, and the grain diameter of the superfine cement is micro- less than 10 Rice；The concentration of the superfine cement is 12%, i.e. the superfine cement accounts for the mass percent of its mixture formed with water For 12%.
  5. 5. a kind of method for improving low permeability fractured type oil reservoir chemical water plugging of oil well success rate according to claim 1, its It is characterised by, described obvious reduction situation occur in shut-in pressure and sleeve pipe open flow flow in wherein step h, then are judged as reaching Expected purpose, water blockoff success rate get a promotion.
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CN106368646B (en) * 2016-08-30 2019-02-15 中国石油天然气股份有限公司 A kind of selective water-plugging technology for low porosity and low permeability reservoir
CN106634910A (en) * 2016-12-15 2017-05-10 陕西庆华石油建设有限公司 Profile control agent and preparation method thereof
CN110173248A (en) * 2019-06-12 2019-08-27 西安方正石油科技有限责任公司 A kind of water blockoff turnaround fracture technique suitable for the old oil of water breakthrough, gas well
CN113153215B (en) * 2021-04-23 2022-11-29 大庆辰平钻井技术服务有限公司 Chemical plugging method for high-water-flooded layer of deflecting section of ultra-short radius horizontal well

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