CN101191407A - Well drilling method for shallow layer thick oil branching well - Google Patents
Well drilling method for shallow layer thick oil branching well Download PDFInfo
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- CN101191407A CN101191407A CNA2006101644162A CN200610164416A CN101191407A CN 101191407 A CN101191407 A CN 101191407A CN A2006101644162 A CNA2006101644162 A CN A2006101644162A CN 200610164416 A CN200610164416 A CN 200610164416A CN 101191407 A CN101191407 A CN 101191407A
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Abstract
The invention relates to a drilling method for a superficial thick oil branch well. The technical proposal of the invention is that: construction is performed in turn according to position sequence of branch points of various branch wellbores on a main horizontal wellbore; when a section of main wellbore is drilled in every time and a drill bit reaches the branch points of the branch wellbores, the branch wellbores are drilled at first and the drill bit is lifted to the branch points of the branch wellbores, and then the next section of the main wellbore is drilled into until the drilling operation of all parts of the branch wellbores and the main wellbore is completed. The drilling method provided by the invention mainly aims to realize that the branch well technology is utilized to exploit superficial thick oil reservoirs.
Description
Technical field
The present invention relates to the oilfield drilling operation, especially a kind of boring method of shallow layer thick oil branching well.
Background technology
The branch hole drilling completion technique is subjected to showing great attention to of domestic and international oil industry, and it is asserted at the beginning of 21 century first of the most potential drilling well new technology by the international petroleum brainstrust, has represented the direction of 21 century drilling well development.For the shallow layer thick oil oil reservoir of common employing heat extraction by steam injection, some exposed branch well holes if can distribute at the net horizontal section of shallow layer thick oil horizontal well, for increasing involving scope, improving thick oil recovery ratio and be highly profitable of steam injection, the main horizontal hole of this shallow layer thick oil oil pool branch well requires to adopt tubing string that slot pipe etc. can provide oil stream and steam channel hole as completion tubular column, the mode that the branch horizontal well eye then can adopt bore hole to finish.So, the key issue that the shallow layer thick oil branching well faces is exactly: after the finishing drilling, main horizontal hole must guarantee the ability of reentrying, to guarantee being lowered to smoothly of main horizontal hole completion tubular column, and for branch well hole, the not specific (special) requirements of reentry property aspect, direct bore hole is finished and is got final product after the finishing drilling.Because shallow layer thick oil oil reservoir buried depth is all more shallow, the complexity of conventional Multilateral Wells technology and invest high characteristics and make this technology in the exploitation of shallow layer thick oil oil reservoir, use to be subject to significant restrictions.At present, Shang Weiyou can take into account the shallow layer thick oil branching well drilling technology that cost is low, construction is simple, the high many-side of reliability requires.
Summary of the invention
The object of the present invention is to provide a kind of boring method of simple and easy to do shallow layer thick oil branching well,, reduce the drilling cost of shallow layer thick oil oil reservoir, improve the individual well recovery ratio to improve and supporting shallow layer thick oil branching well technology.
The boring method of shallow layer thick oil branching well provided by the invention, be meant from a main horizontal hole both sides sidetracking and go out a plurality of branch horizontal well eyes, main horizontal hole is lowered to screen casing, branch well hole adopts the boring method of barefoot completion, the following technology of main employing of creeping into of its horizontal hole is drilled to: construct successively in the priority sequence of positions of main horizontal hole according to each branch well hole branch point, creep into one section main borehole earlier at every turn, when drill bit arrives the bifurcation of branch well hole, subdrilling finishes branch well hole, the bifurcation of branch well hole will be mentioned then on the drill bit, then creep into next section of main borehole, up to the work of creeping into of finishing whole branch well holes and main borehole.
When main borehole is drilled into design branch point position, in the time of need be from the sorrowful brill branch well hole of main borehole, be strayed into branch well hole for preventing down brill, adjust the track control method that well track creeps into again behind the certain distance of can taking to climb earlier after each branch well hole branch.
In addition, excessive for preventing that unsettled sidetracked hole section direction of deflection from changing, track is out of control, when unsettled sidetracking was proceeded creeping into of main borehole after branch well hole was finished, can carry out according to following steps:
(1) at first, put on repeatedly slowly at the curved screw rod of same direction utilization and put directed reaming;
(2) secondly, produce step or new well in predetermined sidetracking location fixes;
(3) Controlling Borehole Trajectory is normally crept into then.
The major advantage of shallow layer thick oil branching well provided by the invention is: the present invention is by taking suitable processing step, by taking effectively to have guaranteed the reenterability of main borehole by the reasonable control of the well track of the overall working procedure behind the forward direction and branch point place branch well and main borehole, the entire job process need not to use special drillng operation instrument can realize the reentry of main borehole after the sidetracking at branch point place and the finishing drilling, has the advantages that technology is simple, operating risk is low.
The specific embodiment
Below in conjunction with instantiation the present invention is further detailed.
It is as follows to adopt branch hole drilling method provided by the invention to finish the concrete work progress of a bite shallow layer thick oil branching well:
(1) finishing creeping into of top well section, for the shallow layer thick oil branching well, generally all is to finish creeping into of top straight well section and angle buildup interval, bores the starting point that reaches horizontal segment, next:
(2) with protective casing down to the precalculated position, cementing well;
(3) adopt the drill bit of little one-level size to spud in once more, creeping into all of following main borehole and branch well hole can be adopted following drilling assembly: drill bit+list is bent screw rod+ball-type centralizer+no magnetic pressure-bearing drilling rod+MWD pipe nipple+no magnetic pressure-bearing drilling rod+heavy weight drill pipe+slope drilling rod+heavy weight drill pipe+slope drilling rod;
When (4) being drilled into the first branch point place, the well orientation according to first branch well hole utilizes the screw rod directional drilling, requires at first branch well hole to climb at the branch point place in this process and creeps into, with the vertical depth of the branch well hole 2～3m that rises.Mainly be consider branch well hole finish carry brill after, be drilled into main borehole down once more, prevent that drilling tool is strayed into this branch well hole;
(5) after climbing is crept into, creep into according to oil reservoir situation increasing hole angle or drop angle control Multilateral Wells well track again;
After (6) first branch well holes are finished, in pit shaft, replace, to safeguard the follow-up wellbore stability that creeps into this branch well hole in the operation into diesel oil;
(7) carry and be drilled into the branch point place, utilize screw rod towards the opposite azimuthal orientation reaming of branch well hole, and get out step, continue main borehole then and creep into;
Repeat above-mentioned steps when (8) being drilled into the branch point place of second branch well hole, finish second and the creeping into of follow-up all branch well holes and main borehole.
Claims (3)
1. the boring method of a shallow layer thick oil branching well, be meant that going out a plurality of branch horizontal well eyes, main horizontal hole from a main horizontal hole both sides sidetracking is lowered to the boring method that screen casing, branch well hole adopt barefoot completion, it is characterized in that horizontal hole adopts following method to be drilled to:
Construct successively in the priority sequence of positions of main horizontal hole according to each branch well hole branch point, creep into one section main borehole earlier at every turn, when drill bit arrives the bifurcation of branch well hole, subdrilling finishes branch well hole, the bifurcation of branch well hole will be mentioned then on the drill bit, then creep into next section of main borehole, up to the work of creeping into of finishing whole branch well holes and main borehole.
2. the boring method of shallow layer thick oil branching well according to claim 1, it is characterized in that: when main borehole is drilled into design branch point position from main borehole sidetracking branch well hole, be strayed into branch well hole for preventing from down to bore, adjust the hole trajectory control technology that well track creeps into again behind the certain distance of taking after each branch well hole branch to climb earlier.
3. according to the boring method of claim 1 or 2 described shallow layer thick oil branching wells, it is characterized in that, when unsettled sidetracking was proceeded creeping into of main borehole after branch well hole was finished, carry out according to following steps:
(1) at first, put on repeatedly slowly at the curved screw rod of same direction utilization and put directed reaming;
(2) secondly, produce step or new well in predetermined sidetracking location fixes;
(3) then, Controlling Borehole Trajectory is normally crept into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101644162A CN101191407A (en) | 2006-11-30 | 2006-11-30 | Well drilling method for shallow layer thick oil branching well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101644162A CN101191407A (en) | 2006-11-30 | 2006-11-30 | Well drilling method for shallow layer thick oil branching well |
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| Publication Number | Publication Date |
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| CN101191407A true CN101191407A (en) | 2008-06-04 |
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| CNA2006101644162A Pending CN101191407A (en) | 2006-11-30 | 2006-11-30 | Well drilling method for shallow layer thick oil branching well |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806207A (en) * | 2010-04-26 | 2010-08-18 | 徐萍 | Horizontal well three-dimensional intersection well pattern structure |
| CN101818620A (en) * | 2010-04-26 | 2010-09-01 | 徐萍 | Mining method for maximum reservoir contact well and maximum reservoir contact well structure |
| CN101975048A (en) * | 2010-10-19 | 2011-02-16 | 陕西龙门天地煤层气技术工程有限公司 | Construction process of multi-branch underground screen pipe |
| CN102182403A (en) * | 2011-04-28 | 2011-09-14 | 王萍萍 | Drilling type well completion technology for fishbone branch borehole |
| CN101672159B (en) * | 2009-10-23 | 2012-09-05 | 大庆油田有限责任公司 | Vertical well wall small-bore bare hole horizontal well drilling method for oil-water well |
| CN106609657A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | Drilling tool assembly and method for well drilling with same |
| CN106609656A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | An open hole side tracking construction method for ultra-deep hard formations |
| CN106761624A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | The method for improving heavy crude reservoir edge reserves exploitation rate |
| CN111197461A (en) * | 2020-01-19 | 2020-05-26 | 北京中海沃邦能源投资有限公司 | Horizontal well suspended sidetracking method and sidetracking tool |
-
2006
- 2006-11-30 CN CNA2006101644162A patent/CN101191407A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672159B (en) * | 2009-10-23 | 2012-09-05 | 大庆油田有限责任公司 | Vertical well wall small-bore bare hole horizontal well drilling method for oil-water well |
| CN101806207A (en) * | 2010-04-26 | 2010-08-18 | 徐萍 | Horizontal well three-dimensional intersection well pattern structure |
| CN101818620A (en) * | 2010-04-26 | 2010-09-01 | 徐萍 | Mining method for maximum reservoir contact well and maximum reservoir contact well structure |
| CN101818620B (en) * | 2010-04-26 | 2013-04-10 | 徐萍 | Mining method for maximum reservoir contact well |
| CN101975048A (en) * | 2010-10-19 | 2011-02-16 | 陕西龙门天地煤层气技术工程有限公司 | Construction process of multi-branch underground screen pipe |
| CN101975048B (en) * | 2010-10-19 | 2013-12-25 | 陕西龙门天地油气技术有限公司 | Construction process of multi-branch underground screen pipe |
| CN102182403A (en) * | 2011-04-28 | 2011-09-14 | 王萍萍 | Drilling type well completion technology for fishbone branch borehole |
| CN102182403B (en) * | 2011-04-28 | 2016-06-29 | 王萍萍 | Drilling type well completion technology for fishbone branch borehole |
| CN106609657A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | Drilling tool assembly and method for well drilling with same |
| CN106609656A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | An open hole side tracking construction method for ultra-deep hard formations |
| CN106761624A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | The method for improving heavy crude reservoir edge reserves exploitation rate |
| CN111197461A (en) * | 2020-01-19 | 2020-05-26 | 北京中海沃邦能源投资有限公司 | Horizontal well suspended sidetracking method and sidetracking tool |
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Effective date of registration: 20081219 Address after: Hongyan road Karamay City, No. 80 the Xinjiang Uygur Autonomous Region post encoding: 834000 Applicant after: Western Drilling Kelamayi Drilling Technology Institute Address before: Hongyan road Karamay City, No. 80 the Xinjiang Uygur Autonomous Region post encoding: 834000 Applicant before: Research Inst of Drilling Technology, Xinjiang Petroleum Administration |
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Owner name: WEST DRILLING KARAMAY DRILLING CRAFT RESEARCH INST Free format text: FORMER OWNER: DRILLING WELL TECHNOLOGY INSTITUTE, PETROLEUM ADMINISTRATION BUREAU, XINJIANG Effective date: 20081219 |
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Open date: 20080604 |