Connect public, paid and private patent data with Google Patents Public Datasets

Method of well completion in permafrost

Download PDF

Info

Publication number
US3830303A
US3830303A US44437774A US3830303A US 3830303 A US3830303 A US 3830303A US 44437774 A US44437774 A US 44437774A US 3830303 A US3830303 A US 3830303A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
permafrost
liquid
pipe
zone
wellbore
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.)
Expired - Lifetime
Application number
Inventor
T Perkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlantic Richfield Co
Original Assignee
Atlantic Richfield Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/02Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using burners
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/14Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S166/00Wells
    • Y10S166/901Wells in frozen terrain

Abstract

A method and apparatus for drilling, completing, and/or producing a well through a permafrost zone wherein a liquid such as water is either introduced into a thawed region of the permafrost to prevent compaction of the permafrost or liquid is removed from a thawed region in the permafrost zone to prevent the generation of abnormal pressures on a wellbore and/or apparatus therein should the liquid freeze. A method for completing a well in a permafrost zone wherein a pipe is run into the wellbore adjacent to the casing and the pipe is perforated after placement in the wellbore to provide means for introducing liquid into and removing liquid from the permafrost zone.

Description

United States Patent 1191 1111 3,830,303

Perkins Aug. 20, 1974 [54] METHOD OF WELL COMPLETION IN 3,704,749 12/1972 Estes l66/DIG. 1 PERMAFROST 3,766,985 10 1973 Willhite l66/DIG. 1

[75] Inventor: Thomas K. Perkins, Dallas, Tex. Primary Examiner David H. Brown [73] Assignee: Atlantic Richfield Company, New Attorney, Agent, or Firm-Roderick W. MacDonald York, NY. 22] Filed: Feb. 21, 1974 [57] ABSTRACT A method and apparatus for drilling, completing, and- [21] Appl' 444377 lor producing a well through a ermafrost zone O p Related US. Application Dat wherein a liquid such as water is either introduced [62] Division of 339,513 Marchg 1973 into a thawed region of the permafrost to prevent Y compaction of the permafrost or liquid is removed 52 us. (:1 166/297, 175/451, 166/DlG. 1 from a thawed region in the Pm"afrost Zone to P 51] Int CL E21) 29 00 21 43/119 21 7 024 vent the generation Of abnormal PI'CSSUI'CS on a well- [58] Field of Search 175/451; 166/297 298, bore and/or apparatus therein should the liquid freeze. 166/1316 1 A method for completing a well in a permafrost zone wherein a pipe is run into the wellbore adjacent to the [56] References Cited casing and the pipe is perforated after placement in UNITED STATES PATENTS the wellbore to provide means for introducing liquid into and removing liquid from the permafrost zone. 3,294,163 12/1966 Lebourg l75/4.5l X 3,426,849 2/1960 Brumble 175/451 x 2 s, 3 Drawing Flglll'es 1- l V '1 I K EV) V PAIENIED mnzomm FIG. 2'

METHOD OF WELL COMPLETION IN PERMAFROST CROSS REFERENCE TO RELATED APPLICATIONS This application is a division of application Ser. No. 339,513, filed Mar. 9, 1973.

BACKGROUND OF THE INVENTION Heretofore in the drilling, completion, and production of wells through a permafrost zone, strenuous efforts have been made to prevent any thawing of the permafrost whatsoever. This avoids, among other things, compaction of the permafrost, e.g., subsidence of the thawed permafrost and, possibly, the ground level. However, in certain instances, it is virtually impossible to avoid thawing a limited region of permafrost no matter how great the effort.

Once there is a thawed region in the permafrost near the wellbore, the thawed region can have a freezable liquid therein, e.g., water. It is desirable,should the thawed region refreeze again, to remove sufficient of the freezable liquid so that upon refreezing of the thawed region and conversion of any liquid water present into ice, abnormal pressures not be built up on the wellbore and/or any apparatus therein by the refreezing process.

SUMMARY OF THE INVENTION According to this invention there is provided a method for drilling, completing, and/or producing a well through a permafrost zone wherein a liquid is injected into one or more thawed regions in an amount and under a pressure sufficient to prevent substantial compaction of the permafrost materials in the thus treated thawed region or regions.

This invention also includes removing liquid from a thawed region in an amount sufficient to prevent the buildup of absornal pressures on the wellbore and/or any apparatus therein due to refreezing of the thawed region.

There is also provided well apparatus in a wellbore in a permafrost zone wherein there is pipe means, e.g., casing, in the wellbore and means for at least one of introducing liquid into and/or removing liquid from the permafrost zone, particularly in the vicinity of the wellbore.

There is also provided a method for completing a well in a permafrost zone wherein besides running casing into the wellbore, a pipe is run into the wellbore adjacent the casing. After the running of the pipe, it is perforated toward the permafrost at a plurality of points to provide a pipe meansadjacent the casing which can be used for the introduction of liquid into the permafrost or the removal ofliquid from the permafrost.

Accordingly, it is an object of this invention to provide a new and improved method and apparatus for drilling, completing, and/or producing a well through a permafrost zone. It is another object to provide a new and improved method and apparatus for drilling, completing and/or producing a well through permafrost and in the vicinity of one or more thawed regions of permafrost. It is another object to provide a new and improved method and apparatus for relieving stress on a wellbore in permafrost and/or any apparatus therein when one or more thawed regions in the permafrost at least partially refreeze. It is another object to provide a new and improved method and apparatus for drilling, completing, and/or producing a well in permafrost wherein compaction of any thawed regions of permafrost is prevented or minimized. It is another object to provide a new and improved method and apparatus for drilling, completing, and/or producing a well in permafrost wherein subsidence of the earths surface due to thawing of one or more regions in the permafrost is prevented.

Other aspects, objects and advantages of this invention will be apparent to those skilled in the art from this disclosure and the appended claims.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a cross section of apparatus according to one embodiment of this invention and for carrying out the method of this invention.

FIG. 2 shows apparatus according to another embodiment within this invention and for carrying out the method of this invention.

FIG. 3 shows yet another embodiment of apparatus within this invention and capable of carrying out the method of this invention.

More specifically, FIG. I shows the earth s surface 1 below which is a permafrost zone 2. Below permafrost zone 2 is unfrozen earth 3. A first wellbore 4 is drilled through the permafrost zone 2 and 'into unfrozen ground 3 an indefinite distance. Pipe means such as conventional casing 5 is set in wellbore 4 by way of cement 6. Spaced from wellbore 4 but in the vicinity of that wellbore is a second wellbore 7 which also is drilled through permafrost 2 and into unfrozen ground 3. Wellbore 7 can extend partly into permafrost zone 2 or all the way to thebottom of zone 2, or all the way through zone 2 and into unfrozen ground 3 as shown in FIG. 1, as desired. A perforate pipe means 8 is placed in wellbore 7, pipe means 8 being perforate in that it has a plurality of slots 9 through the wall thereof and along the length of pipe 8 in permafrost zone 2. Slots 9 give open communication between permafrost zone 2 and the interior of pipe 8 so that a liquid can be passed downwardly through pipe 8 as shown by arrow 10 and outwardly through slots 9 into thawed regions of permafrost zone 2. Pipe 8 can be capped or otherwise plugged at its lower end (not shown) or can be open at its lower end to allow liquid to enter and/or leave a thawed region by way of said lower end and, if desired, to be connected below the permafrost. Conversely, liquid in permafrost zone 2 can passthrough slots 9 into the interior of pipe 8 and be pumped in a conventional manner by surface or downhole pumps upwardly to the earths surface to remove freezable liquid from the permafrost before it refreezes. Slots 9 canbe any sort of aperture(s) in pipe 8, e.g., round holes, pores, and the like, or even conventional perforation holes caused by lowering a perforation gun into the interior of pipe 8 and perforating same in a conventional manner well-known in the petroleum industry. A primary goal of pipe 8 is to provide a vertical passageway with a plurality of access openings along the length thereof in the permafrost zone for the introduction and/or removal of liquid relative to the permafrost zone.

FIG. 2 shows wellbore 4 with casing 5 cemented therein by cement 6 except that casing 5 has a pipe means 11 strapped thereto by strap means 12 so that when casing was run into the wellbore, pipe 11 was run with the casing. Pipe 11 can be run with the casing, or before or after the casing is run as desired, it not being necessary that pipe 11 be strapped to casing 5. The point in this embodiment is that pipe 11 is in the same wellbore with the casing and can even be cemented in place with the casing. Pipe 11 can be perfo rate as run or can be imperforate as run. If pipe 11 is imperforate, after it is in place and cemented, if cementing is to be carried out, a conventional perforating gun is lowered through pipe 11, oriented toward the sides of the wellbore, i.e., toward the permafrost and not toward casing 5, and then perforated in one or more places as shown by arrows 13 and 14. In this way pipe 11, any cement therearound, and even permafrost zone 2 can be perforated to provide the desired liquid access port(s) along the length of the pipe 11 which is in permafrost zone 2.

FIG. 3 shows casing 5 in wellbore 4 in permafrost zone 2 wherein the cement surrounding casing 5 is divided into segments 15 through 17, inclusive. Adjacent segments are spaced apart from one another to form a plurality of upstanding passageways 18 through 20, inclusive. Passageways 18 through 20 provide vertical access in the same manner as pipes 8 and 11 of FIGS. 1 and 2, respectively. These passageways, being open adjacent the walls of wellbore 4, also provide access to permafrost zone 2 for the introduction of liquid thereinto upon the withdrawal of liquid therefrom.

The liquid introduced into the permafrost to prevent compaction of materials therein due to thawing can be any liquid which is substantially nondeleterious to the permafrost. Obviously, fresh water, salt water, and the like, can be employed. Similarly, aqueous materials such as water having one or more freezing point depressants mixed therewith, and the like, can be employed as well. Nonaqueous liquids can also be employed if desired and suitable for the specific purpose to be accomplished.

The amount of liquid employed will vary widely depending upon the particular situation and the liquid used. Generally, liquid will be used in an amount and under pressure sufficient to prevent substantial compaction of permafrost materials in the thawed region or regions to be treated. The liquid can be injected at any desirable temperature, preferably at a temperature which will prevent substantial additional thawing of the permafrost. As regards water or aqueous liquids, these can be injected at a temperature near the freezing point of the water or liquid injected under the conditions then prevailing in the treated thawed region. The pressure of injection for the liquid can vary widely, again depending upon the particular situation of the treated material and need not be a substantial pressure. Generally, the injection pressure will be at least about one psig, preferably at least about psig.

When freezable liquid such as water is removed from a thawed region prior to refreezing of that region, the liquid should not be removed in an amount sufficient to allow substantial compaction of the permafrost but should be removed in an amount sufficient to prevent buildup of abnormal pressures which could adversely affect the wellbore and/or any apparatus therein, e.g., due to expansion of the water or other liquid during freezing. The liquid will generally flow out of the refreezing region and up through pipes 8, 11, etc., to the earths surface. However, if desired, pumps (surface or downhole) can be used to assist in removing this liquid. If, for example, pipe 8 is in communication with another permeable region such as a porous region elsewhere in the permafrost or even below the permafrost the liquid could flow to these other regions. For example, the liquid could flow downwardly to the bottom of pipe 8 and into a permeable region below the permafrost instead of flowing upwardly to the earths surface.

Liquid handling means other than pipes 8 and 11 of FIGS. 1 and 2, respectively, and open channels 18 through 20 of FIG. 3, can be employed to accomplish the purposes of this invention. For example, liquid permeable cement could be employed inlieu of cement 6 in FIG. 1, the permeable cement being deliberately porous so as to admit the percolation of substantial amounts of liquid vertically therethrough. Other types of liquid permeable packing beside permeable cement can be employed around casing 5. For example, the annulus between the exterior of casing 5 and the interior of wellbore 4 of FIG. 1 can contain, instead of cement 6, a bed of solid particles such as gravel. The interstices between the solid particles provides passageways for vertical flow of liquid into or out of permafrost zone 2 and along the annulus containing the bed of solid particles. The longitudinally channelized cement of FIG. 3 can also be considered as a liquid permeable packing and can be produced in a number of ways, not the least of which is the deliberate performance of a poor cementing job wherein the cement channelizes around a foreign liquid such as drilling mud and the like which is left in the annulus. Also, the cement can deliberately be mixed with oil or an oil base material or drilling mud so that when laminar flow is set up in the annulus between casing 5 and wellbore 4 the foreign liquid channelizes through the cement. After the cement is hardened and the foreign liquid removed, open passageways such as passageways 18 through 20 of FIG. 3 will then be left.

EXAMPLE Apparatus substantially the same as that shown in FIG. 1 is set up in a permafrost zone approximately 2,000 feet in depth. Pipe 8 extends down to the bottom of permafrost zone 2 and is capped at its lower end. Salt water at a temperature of 50F. and pressure of 25 psig is forced downwardly in pipe 8 and outwardly through slots 9 and into thawed regions of permafrost zone 2 caused by the production of hot oil through casing 5. The water is injected in an amount sufficient to prevent subsidence of earth surface 1 in the vicinity of wellbores 4 and 7.

When production of hot oil through casing 5 is ceased for any substantial period of time, liquid water flows from the permafrost through slots 9, into the interior of pipe 8, and back to the earths surface thereby removing liquid water from the thawed zones as the thawed zones refreeze due to being surrounded by still frozen permafrost. The liquid water is removed from the zone 2 by way of pipe 8 in an amount sufficient to prevent substantial pressure buildup on wellbore 4, cement 6, and casing 5 contained therein but not in an amount sufficient to allow subsidence of earth surface 1 prior to refreezing of the thawed regions of perma frost.

casing in said wellbore, running a pipe adjacent said casing in said wellbore, and perforating said pipe toward said permafrost at a plurality of points along the length of said pipe which is in said permafrost zone.

2. A method according to claim 1 wherein said casing and pipe are cemented in, and said permafrost step perforates said pipe, cement, and permafrost.

Claims (2)

1. A method for completing a well in a permafrost zone comprising drilling a wellbore therein, running casing in said wellbore, running a pipe adjacent said casing in said wellbore, and perforating said pipe toward said permafrost at a plurality of points along the length of said pipe which is in said permafrost zone.
2. A method according to claim 1 wherein said casing and pipe are cemented in, and said permafrost step perforates said pipe, cement, and permafrost.
US3830303A 1973-03-09 1974-02-21 Method of well completion in permafrost Expired - Lifetime US3830303A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US3818992A US3818992A (en) 1973-03-09 1973-03-09 Well drilling, completion and production in permafrost
US3830303A US3830303A (en) 1973-03-09 1974-02-21 Method of well completion in permafrost

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3830303A US3830303A (en) 1973-03-09 1974-02-21 Method of well completion in permafrost

Publications (1)

Publication Number Publication Date
US3830303A true US3830303A (en) 1974-08-20

Family

ID=26991666

Family Applications (1)

Application Number Title Priority Date Filing Date
US3830303A Expired - Lifetime US3830303A (en) 1973-03-09 1974-02-21 Method of well completion in permafrost

Country Status (1)

Country Link
US (1) US3830303A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926259A (en) * 1975-03-31 1975-12-16 Atlantic Richfield Co Method for normalizing stresses and strains in a well casing in a permafrost zone
US4626522A (en) * 1980-01-17 1986-12-02 John Wyeth & Brother Limited Benzoxazocines intermediates
US5251700A (en) * 1990-02-05 1993-10-12 Hrubetz Environmental Services, Inc. Well casing providing directional flow of injection fluids
US20040144539A1 (en) * 2001-01-31 2004-07-29 Smith David Randolph Apparatus and method to mechanically orient perforating systems in a well
US20050121195A1 (en) * 2003-01-09 2005-06-09 Bell Matthew R.G. Casing conveyed well perforating apparatus and method
US8376659B2 (en) * 2004-07-26 2013-02-19 Benton F. Baugh Arctic platform method
RU2521437C2 (en) * 2012-04-24 2014-06-27 Открытое акционерное общество "Ведущий проектно-изыскательский и научно-исследовательский институт промышленной технологии" ОАО "ВНИПИпромтехнологии" Construction method of underground repository for radioactive wastes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294163A (en) * 1959-02-24 1966-12-27 Schlumberger Well Surv Corp Orienting and perforating methods and apparatus
US3426849A (en) * 1966-05-13 1969-02-11 Exxon Production Research Co Method and apparatus for well operations
US3704749A (en) * 1971-05-06 1972-12-05 Nl Industries Inc Method and apparatus for tool orientation in a bore hole
US3766985A (en) * 1971-12-01 1973-10-23 Univ Kansas State Production of oil from well cased in permafrost

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294163A (en) * 1959-02-24 1966-12-27 Schlumberger Well Surv Corp Orienting and perforating methods and apparatus
US3426849A (en) * 1966-05-13 1969-02-11 Exxon Production Research Co Method and apparatus for well operations
US3704749A (en) * 1971-05-06 1972-12-05 Nl Industries Inc Method and apparatus for tool orientation in a bore hole
US3766985A (en) * 1971-12-01 1973-10-23 Univ Kansas State Production of oil from well cased in permafrost

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926259A (en) * 1975-03-31 1975-12-16 Atlantic Richfield Co Method for normalizing stresses and strains in a well casing in a permafrost zone
US4626522A (en) * 1980-01-17 1986-12-02 John Wyeth & Brother Limited Benzoxazocines intermediates
US5251700A (en) * 1990-02-05 1993-10-12 Hrubetz Environmental Services, Inc. Well casing providing directional flow of injection fluids
US20040144539A1 (en) * 2001-01-31 2004-07-29 Smith David Randolph Apparatus and method to mechanically orient perforating systems in a well
US7469745B2 (en) * 2001-01-31 2008-12-30 Schlumberger Technology Corporation Apparatus and method to mechanically orient perforating systems in a well
US7284601B2 (en) 2003-01-09 2007-10-23 Shell Oil Company Casing conveyed well perforating apparatus and method
US20060196693A1 (en) * 2003-01-09 2006-09-07 Bell Matthew R G Perforating apparatus, firing assembly, and method
US20060060355A1 (en) * 2003-01-09 2006-03-23 Bell Matthew R G Perforating apparatus, firing assembly, and method
US7284489B2 (en) * 2003-01-09 2007-10-23 Shell Oil Company Casing conveyed well perforating apparatus and method
US7461580B2 (en) 2003-01-09 2008-12-09 Shell Oil Company Casing conveyed well perforating apparatus and method
US20050121195A1 (en) * 2003-01-09 2005-06-09 Bell Matthew R.G. Casing conveyed well perforating apparatus and method
US7975592B2 (en) 2003-01-09 2011-07-12 Shell Oil Company Perforating apparatus, firing assembly, and method
US8376659B2 (en) * 2004-07-26 2013-02-19 Benton F. Baugh Arctic platform method
RU2521437C2 (en) * 2012-04-24 2014-06-27 Открытое акционерное общество "Ведущий проектно-изыскательский и научно-исследовательский институт промышленной технологии" ОАО "ВНИПИпромтехнологии" Construction method of underground repository for radioactive wastes

Similar Documents

Publication Publication Date Title
US3497020A (en) System for reducing hydrostatic pressure on formations
US3613792A (en) Oil well and method for production of oil through permafrost zone
US3572432A (en) Apparatus for flotation completion for highly deviated wells
US3394758A (en) Method for drilling wells with a gas
US3498378A (en) Oil recovery from fractured matrix reservoirs
US3489222A (en) Method of consolidating earth formations without removing tubing from well
US3193010A (en) Cementing multiple pipe strings in well bores
US3329204A (en) Methods for well completion
US3295328A (en) Reservoir for storage of volatile liquids and method of forming the same
US3353599A (en) Method and apparatus for stabilizing formations
US3108636A (en) Method and apparatus for fracturing underground earth formations
US3393736A (en) Well completion method
US3302707A (en) Method for improving fluid recoveries from earthen formations
US3057404A (en) Method and system for producing oil tenaciously held in porous formations
US3765484A (en) Method and apparatus for treating selected reservoir portions
US5984010A (en) Hydrocarbon recovery systems and methods
US5547023A (en) Sand control well completion methods for poorly consolidated formations
US4856587A (en) Recovery of oil from oil-bearing formation by continually flowing pressurized heated gas through channel alongside matrix
US5036918A (en) Method for improving sustained solids-free production from heavy oil reservoirs
US5103911A (en) Method and apparatus for perforating a well liner and for fracturing a surrounding formation
US3118501A (en) Means for perforating and fracturing earth formations
US4665982A (en) Formation fracturing technique using liquid proppant carrier followed by foam
US5810085A (en) Drill hole plugging method utilizing sodium bentonite nodules
US6263965B1 (en) Multiple drain method for recovering oil from tar sand
US3587743A (en) Explosively fracturing formations in wells