CN101196103A - Squeezing cement plugging technical skill for thick oil absorption well - Google Patents
Squeezing cement plugging technical skill for thick oil absorption well Download PDFInfo
- Publication number
- CN101196103A CN101196103A CNA2008100100343A CN200810010034A CN101196103A CN 101196103 A CN101196103 A CN 101196103A CN A2008100100343 A CNA2008100100343 A CN A2008100100343A CN 200810010034 A CN200810010034 A CN 200810010034A CN 101196103 A CN101196103 A CN 101196103A
- Authority
- CN
- China
- Prior art keywords
- cement
- oil
- sleeve pipe
- well
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to the thick oil absorption well squeeze cementing leakage sealing process technology. The process technology performs the adjustment and controlling according to the pressure difference of the well head oil and the sleeve during the process of the squeeze cementing displacement, in addition, the leakage stoppage, the re-washing of liquid cement and the moving of a pipe column are inexistent during the whole construction process, and the nonpressurized cement curing is adopted. The invention has novel conception, and the adjustment and controlling is easy to be executed, because the invention adopts the leakage stoppage free, the liquid cement re-washing free and the pipe column moving free and the nonpressurized cement curing squeezing cementing methods to construct, the re-washing of the liquid cement, the moving of the pipe column can not be used and the well can be directly shut off to perform cement curing when the cement mortar displacement is positioned, thereby, the time of the squeezing cementation can be shortened, the working risk and the ground pollution are reduced, the invention is favor of saving the cost and shortening the well repairing time, the technology is suitable for the thick oil well layer sealing and the leakage seal, and is particularly effective to the leakage sealing and the strengthening of the outer cement mantle of a sleeve pipe.
Description
Technical field:
The present invention relates to a kind of technology that is used for the heavy oil wells workover treatment, belong to petroleum well workover operation technique class.
Background technology:
In viscous crude absorption well workover treatment process, must go ahead of the rest the leakage interval is clamp-oned grout off and scurried groove, just can carry out other operations then.At present, on-the-spot in the petroleum well workover operation viscous crude absorption well water squeezing mudding scurry technology commonly used two kinds of methods are arranged: the one, the leak stopping method is carried out squeeze method after using sealing agent that leakage channel is blocked.The 2nd, following cement retainer method will be scurried the above water squeezing mud of layer in the water squeezing mudding under the cement retainer.These water squeezing muddings are scurried process and all need be carried out leak stopping and backwash water drilling mud practice and have following point: 1 envelope is scurried and when reinforcing the outer cement sheath of sleeve pipe, cement paste is told outward, and it is relatively poor that envelope is scurried the effect of reinforcing; 2 closing wells are waited when coagulating, sleeve pipe external and internal pressure imbalance, and sleeve pipe is yielding; Carry out anti-flushing well during 3 squeeze methods, can pollute environment.
Summary of the invention:
The object of the present invention is to provide and a kind ofly can overcome existing viscous crude absorption well water squeezing mudding and scurry process existing problems and not enough squeezing cement plugging technical skill for thick oil absorption well.
Technical scheme of the present invention is as follows:
The characteristics that this kind envelope is scurried technology are in the squeeze method displacement process, regulate and control according to well head oil, sleeve pipe pressure reduction, and, not leak stopping of whole construction course, backwash water mud not, fixed tubular column, and adopt normal pressure to wait and coagulate.The implementation step of this technology is as follows: following bare string begins water squeezing mud to projected depth; Behind the boundary, pump truck begins to inject equilibrium liquid by sleeve pipe in well at the bottom of the cement paste arrival oil reservoir in the oil pipe, and oil pipe continues to inject cement paste and do not stop; The oil jacket annular space is closed in termination of pumping when the pump pressure of sleeve pipe reaches certain numerical value, continues positive cement injection in oil pipe; Just squeezing displacement fluid when pressure reaches design pressure, displacement fluid is closed the oil pipe gate after cement paste is ejected the following certain depth of tubing shoe; Instead squeeze displacement fluid from the oil jacket annular space cement paste is pushed up to the following 100m of tubing shoe or darker, close sleeve gate and wait with fixed attention.
In the squeeze method process, the head of liquid of sleeve pipe and oil pipe is observed U type pipe pressure equilibrium principle, and tubing shoe place pressure dependence formula is as follows:
P
Cover is total=P
Oil is total, that is P
Cover+ P
Cover 1+ P
Cover 2=P
Oil+ P
Oil 1+ P
Oil 2Or be P
Cover+ γ
The topGH
1+ γ
CementGH
3=P
Oil+ γ
The topGH
2+ γ
CementGH
4
In the formula: P
Cover is total--the sleeve pipe gross pressure; P
Oil is total-oil pipe gross pressure; P
Cover--the cased well mouth pressure; P
Oil--the oil pipe well head pressure; P
Cover 1--sleeve pipe displacement fluid head of liquid; P
Cover 2--the sleeve water mud column pressure; P
Oil 1-oil pipe displacement fluid head of liquid; P
Oil 2-sleeve water mud fluid column pressure; H
1--sleeve pipe displacement fluid liquid-column height; H
2-oil pipe displacement fluid liquid-column height; H
3--sleeve water mud height; H
4--oil pipe cement paste height; γ
The top, γ
CementBe respectively displacement fluid and cement slurry density; G-acceleration of gravity m/s
2
Whole water squeezing mudding is scurried activities can be divided into five stages, and each stage technique main points is as follows:
Phase I: leakage stage
Because oil well is missed, the fluid column in the well can not be full of pit shaft when water squeezing mud began, and liquid level is not at well head, it is empty that part is arranged in the pit shaft, the oil jacket annular pressure is a negative value, and when the infiltration rate on stratum during greater than the injection rate of oil, cover, the cement paste in the oil pipe can not return annular space from pipe shoe.
Second stage: pressure recovers the stage
When the infiltration rate on stratum during less than the injection rate of oil, sleeve pipe, some enters the stratum fluid in oil, the cover annular space, and another part enters the space that casing annulus does not fill up.(φ 177.8mm) casing annulus volume is greater than the internal volume of oil pipe generally speaking, and when discharge capacity oily, that cover injects fluid was identical, fluid was full of casing annulus after being full of oil pipe earlier again.Be that cement paste returns annular space from pipe shoe.
Phase III: band is pressed into the stage
When the fluid in oil, cover space when being full of, be full of cement paste in the oil pipe, well head plays pressure, is water γ as equilibrium liquid when the squeeze method
The top=1g/cm
3, the density γ of cement paste
Cement=1.81g/cm
3Can calculate according to the aforementioned pressure balanced relationship: P
Cover=7.94H
1+ P
Oil
According to following formula as seen, the well head sleeve pipe rises earlier and presses, and sleeve pipe rises when pressing and should continue to squeeze into displacement fluid from sleeve pipe, makes casing annulus not have cement paste, all is full of displacement fluid, when oil pipe and sleeve pipe maximal pressure difference are 7.94H, does not have cement paste in the sleeve pipe.When the degree of depth of squeeze method tubing string was 1km, the maximal pressure difference of oil pipe and sleeve pipe was 7.94Mpa.When all being displacement fluid in the sleeve pipe, close sleeve pipe, oil pipe continues squeeze method.The purpose that replaces at squeeze method process middle sleeve is that to make the anhydrous mud of oil jacket annular space be that the oil jacket annular space is full of displacement fluid.Can know H at any time according to formula and oil jacket pressure
1Numerical value be the height of sleeve pipe displacement fluid, just can judge sleeve ring return on having in vain not cement paste or on return what of cement paste.
Whether judge has cement paste that three kinds of methods are arranged in the sleeve pipe:
1 equation: judge according to formula Δ P=7.94H.In the formula, H is that the degree of depth of squeeze method tubing string is the pipe shoe degree of depth.
2 volumetric methods: calculate the volume of oil jacket annular space, the amount of equilibrium liquid is squeezed in metering, and when the balance liquid measure of squeezing into sleeve pipe during greater than the volume of oil jacket annular space, cement paste does not have in the sleeve pipe.
3 curve methods: when the squeeze method sizing process entered the phase III, cement paste entered target zone, and pressure is steady.The oil jacket annular space continues to squeeze into equilibrium liquid, and equilibrium liquid goes out behind the pipe shoe along being advanced into target zone under the sleeve pipe, and because of the viscosity of equilibrium liquid is low than the viscosity of cement paste, the pressure of clamp-oning the stratum is low, and pump pressure at this moment can reduce.
Quadravalence section: for the stage of squeezing
When the cement slurry volume of clamp-oning (or tubing pressure of water squeezing mud) stops to clamp-on cement paste when reaching designing requirement, begin to replace to squeeze, cement paste is ejected tubing shoe, close the oil pipe gate.
Five-stage: wait the stage of coagulating
Open sleeve gate, clamp-on displacement fluid from sleeve pipe cement paste is pushed up the precalculated position, closing well is waited and is coagulated.
The present invention is novel, regulation and control easy to implement, owing to adopt not leak stopping, backwash water mud, fixed tubular column and the squeeze method method construction with fixed attention of band pressure time, replace when putting in place and can wait and coagulate at cement paste without backwash water mud, the direct closing well of fixed tubular column, thereby can shorten the squeeze method time, reduce operating risk and ground pollution, help saving cost and shorten the well workover time, this technology is applicable to heavy oil wells seal, stifled scurrying, and it is particularly effective that the outer cement sheath of sleeve pipe is scurried, reinforced to envelope.
Description of drawings:
Accompanying drawing enters water squeezing mud layer tubing pressure change curve for equilibrium liquid in the work progress of the present invention.
The specific embodiment:
As shown in the figure, when the heavy oil wells envelope is scurried job execution, carry out according to aforementioned implementation step, and judge by three kinds of aforementioned methods whether equilibrium liquid arrives pipe shoe.Among the figure, being the oil well leakage stage by O to A, is that pressure recovers the stage by B to C, is that equilibrium liquid enters the water squeezing mud layer stage by C to E, and EF normally clamp-ons the stage for the following no equilibrium liquid of pipe shoe after stopping to buy equilibrium liquid.
Claims (1)
1. squeezing cement plugging technical skill for thick oil absorption well, it is characterized in that: this technology is in the squeeze method displacement process, regulates and control according to well head oil, sleeve pipe pressure reduction, and, not leak stopping of whole construction course, not backwash water mud fixed tubular column, and employing normal pressure is waited and is coagulated; In the squeeze method process, adopt three kinds of methods to judge whether cement paste is arranged in the sleeve pipe:
(1) equation: judge according to formula Δ P=7.94H;
(2) volumetric method: calculate the volume of oil jacket annular space, the amount of equilibrium liquid is squeezed in metering, and when the balance liquid measure of squeezing into sleeve pipe during greater than the volume of oil jacket annular space, cement paste does not have in the sleeve pipe;
(3) curve method: when the squeeze method sizing process entered the phase III, cement paste entered target zone, and pressure is steady; The oil jacket annular space continues to squeeze into equilibrium liquid, and equilibrium liquid goes out behind the pipe shoe along being advanced into target zone under the sleeve pipe, and because of the viscosity of equilibrium liquid is low than the viscosity of cement paste, the pressure of clamp-oning the stratum is low, and pump pressure at this moment can reduce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100100343A CN101196103A (en) | 2008-01-04 | 2008-01-04 | Squeezing cement plugging technical skill for thick oil absorption well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100100343A CN101196103A (en) | 2008-01-04 | 2008-01-04 | Squeezing cement plugging technical skill for thick oil absorption well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101196103A true CN101196103A (en) | 2008-06-11 |
Family
ID=39546708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100100343A Pending CN101196103A (en) | 2008-01-04 | 2008-01-04 | Squeezing cement plugging technical skill for thick oil absorption well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101196103A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879118A (en) * | 2015-04-21 | 2015-09-02 | 长江大学 | Oil well cement depth-returning fixation-accompanying monitoring method and system under conditions of underground single and double leaking layers |
| CN106948788A (en) * | 2017-03-21 | 2017-07-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of method for implementing secondary well cementation in net horizontal section |
| CN114893146A (en) * | 2021-12-24 | 2022-08-12 | 中煤地质集团有限公司 | Method for unsealing and cementing of channeling drilling hole |
-
2008
- 2008-01-04 CN CNA2008100100343A patent/CN101196103A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879118A (en) * | 2015-04-21 | 2015-09-02 | 长江大学 | Oil well cement depth-returning fixation-accompanying monitoring method and system under conditions of underground single and double leaking layers |
| CN104879118B (en) * | 2015-04-21 | 2018-04-24 | 长江大学 | Cementing concrete returns deep with solid monitoring method and system under the conditions of the single, double drop ply in underground |
| CN106948788A (en) * | 2017-03-21 | 2017-07-14 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of method for implementing secondary well cementation in net horizontal section |
| CN106948788B (en) * | 2017-03-21 | 2020-03-17 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for implementing secondary well cementation in horizontal well section |
| CN114893146A (en) * | 2021-12-24 | 2022-08-12 | 中煤地质集团有限公司 | Method for unsealing and cementing of channeling drilling hole |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103343543B (en) | Foundation pit dewatering well pressure-reduction-type plugging method | |
| WO2017000622A1 (en) | Storage-type precise quantitative injection system for injection of underground oil or gas well operating agent and injection method thereof | |
| CN101864925B (en) | Drilling-free sizing collar and process | |
| CN102787602A (en) | Curtain grouting technique | |
| CN102877812A (en) | Method of balancing pressure for well cementation | |
| CN104153738A (en) | Blocking controlling and leaking stopping tool assembly and leaking stopping method applied to drilling engineering | |
| CN207161064U (en) | A kind of long-acting layered water filler of binary channels with one heart | |
| CN101196103A (en) | Squeezing cement plugging technical skill for thick oil absorption well | |
| CN102337859B (en) | Coal field drill hole leak blocking system | |
| CN102493403A (en) | Rock-fill dam deformation control technology | |
| CN203321428U (en) | Controlling and plugging tool assembly applied to drilling engineering | |
| CN109083631B (en) | Utilize the device and method for repairing and mending in coiled tubing repairing cementing concrete crack | |
| CN200989185Y (en) | Expanding flushing packer | |
| CN105587286B (en) | Lost circulation prevention flushing packer | |
| CN111852556A (en) | Forward and reverse drainage method in downward through-layer drilling | |
| CN103470221A (en) | Underbalance tubing, no-killing gas lifting, shaft pumping and pump detecting combined method | |
| CN201209423Y (en) | Oilfield workover treatment cement squeeze device | |
| CN204532233U (en) | well cementing pipe column combination | |
| CN104060959A (en) | Conventional well-flushing valve, pumping well and well flushing method for pumping well | |
| CN110905441A (en) | Well cementation method of low-pressure easy-to-leak well and casing string | |
| CN206769892U (en) | Self-excitation pressure pulse is layered deblocking tool | |
| CN2837505Y (en) | Down-hole grouting tool | |
| CN108979572A (en) | Combined anti-pollution sand flushing device and method | |
| RU2235852C1 (en) | Method of cement bridge forming in well | |
| CN204716213U (en) | Pressure fluctuation meter drives self-balancing piston pump pumping equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080611 |