CN103032050A - Unstable formation treatment technique for rock salt well construction - Google Patents
Unstable formation treatment technique for rock salt well construction Download PDFInfo
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- CN103032050A CN103032050A CN2012105460089A CN201210546008A CN103032050A CN 103032050 A CN103032050 A CN 103032050A CN 2012105460089 A CN2012105460089 A CN 2012105460089A CN 201210546008 A CN201210546008 A CN 201210546008A CN 103032050 A CN103032050 A CN 103032050A
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Abstract
The invention discloses an unstable formation treatment technique for rock salt well construction, which fulfills unstable rock salt formation drilling and well completion operation by carrying out unstable formation isolation and two times of well cementation on an unstable formation in order to achieve the goal of successfully mining the lower rock salt mineral resource covered by the unstable formation. The unstable formation treatment technique includes the following steps: (1) drilling operation; (2) isolation technique; (3) two times of well cementation operations; (4) acceptance and well completion. The unstable formation treatment technique can systematically and reasonably mine the rock salt resource to increase the resource utilization rate; the unstable formation treatment technique can effectively protect the underground water resource of a rock salt mining area and the environment; and the unstable formation treatment technique lays a foundation for the mining of the deep rock salt in the lower part of a cavity via a completed well running through the cavity, shows a broaden prospect in exploiting the potentials of old mining areas, is highly worth popularizing for application, is significant for the progress of the solution mining technology in China, and can bring remarkable economic and social benefits.
Description
Technical field
The present invention relates to rock salt well construction technical field, refer to particularly a kind of rock salt well construction unstability stratum treatment technology.
Background technology
Rock salt adopts " hydrofracturing method " and " directed communicating method " two kinds of solution minings usually." hydrofracturing method " is to utilize Incoercibility and the pressure transmission of water, and water is to the dissolubility of salt deposit, makes under high pressure that ore bed forms the crack between two wells, and with the rapid corrosion in crack, wash away, be extended to the pressure break passage; Then, inject fresh water from a bite well wherein, the dissolving ore bed, generate bittern after, utilize the water filling overbottom pressure to make bittern return out ground from another pairing well." directed communicating method " is as a production unit take two mouthfuls of wells, wherein a bite Small Radius horizontal well carries out directed drilling towards target well (straight well), perhaps two mouthfuls of water horizontal wells carry out directional drilling towards same " target spot " that design, and two wells are communicated with in the working seam bottom, form the initial dissolution passage; Then, inject fresh water from a bite well wherein, the dissolving ore bed generates bittern, makes bittern return out ground from another mouthful well more than the recycling water filling.
Since historical, in the recovery process of rock salt, often exploit first top and bury more shallow salt ore bed, through one period, for improving resource utilization, further exploit again bottom rock salt mineral reserve.During the exploitation of top salt deposit, in salt deposit, form molten chamber, namely formed the unstability stratum.When exploiting the bottom salt mine and becoming well, because molten chamber is communicated with pit shaft, will inevitably produces pit shaft and gush leakage or leakage, cause cementing slurry to enter top along the passage that gushes the leakage position and adopt the molten chamber of layer, and can not return out the earth's surface; Perhaps cause cement paste all to be ejected the earth's surface, thus can't drillng operation and well cementing operation, cause the salt well engineering construction normally to carry out, finally cause bottom rock salt mineral reserve to exploit.
Summary of the invention
Purpose of the present invention will provide a kind of rational exploitation rock salt resource exactly, improves resource utilization, the rock salt well construction unstability stratum treatment technology of protection of the environment.
For achieving the above object, rock salt well construction unstability provided by the present invention stratum treatment technology, it is characterized in that: it is isolated, cements the well for twice to finish the drilling well on unstability rock salt stratum and become well operations the unstability stratum by adopting, and it may further comprise the steps:
(1) drillng operation: adopt three gear wheel drilling wells, adopt layer so that drill bit arrives the bottom purpose of unstability stratum covering;
(2) isolation technology: after drillng operation is finished, carry out casing job and multiple sleeve pipe is transferred to purpose adopt layer, described lower pipe sequentially is followed successively by: tail pipe, production casing, isolator, circulator, production casing, wellhead assembly;
(3) twice well cementing operation: the solid instable layer lower well section of for the first time well cementing operation; The solid caving ground top of for the second time well cementing operation well section;
(4) check and accept and completion: adopt pressure testing equipment to the cementing quality pressure testing check of hunting leak.
As preferred version, slush pump or the cementing truck mud of fetching water is adopted in for the first time well cementing operation in the described step (3), described cement paste proportion is 1.86, make the inside and outside cement that is full of equably of lower parts casing pipe, and adopt and return round-robin method, the above cement paste of described circulator is developed, wait and coagulate after three days, carry out the well cementing operation second time; The cementing truck mud of fetching water is adopted in for the second time well cementing operation, and described cement paste proportion 1.86 makes the above outer ring space of described isolator be full of equably cement paste, finishes well cementing operation.
As preferred version, the pressure testing equipment in the described step (4) is hydraulic test pump.
The invention has the advantages that: the present invention has significant economic benefit and social benefit:
One can planned rational exploitation rock salt resource, can be to the bottom rock salt mining deposits that the unstability stratum such as molten chamber the cover exploitation of taping the latent power, thus the raising resource utilization.
Its two, can effectively protect the groundwater resources in rock salt mining district, prevented that mining ore bed water from entering Quaternary Strata, thereby protection of the environment.
Its three, become well to exploit bottom, molten chamber deep rock salt to lay a good foundation for wearing molten chamber, for taping the latent power of old exploiting field showed wide prospect.
Its four, not only the exploitation for salt mine provides new production technique means, also exploitation and the exploitation for all solubility mineral reserve provides new approach, has the wide prospect that promotes the use, and the progress of China's solution mining technology is significant.
The specific embodiment
The present invention is described in further detail below in conjunction with specific embodiment.
Rock salt well construction unstability of the present invention stratum treatment technology, it is isolated, cements the well to finish the drilling well on unstability rock salt stratum for twice and becomes well operations the unstability stratum by adopting, reach the purpose of the bottom rock salt mineral reserve of smooth exploitation unstability stratum covering, its concrete steps are:
(1) drilling well: adopt three gear wheel drilling wells, in the wellbore construction process, pay close attention to slush pump pump pressure and electric current, return out under the prerequisite on ground without flushing liquor in assurance, allow drill bit smoothly by molten chamber, the purpose that arrives the bottom salt mine is adopted layer.
(2) isolation technology: after drillng operation is finished, strictly in the following order multiple sleeve pipe is transferred to purpose and adopt layer, its lower pipe is smoothly: tail pipe, production casing, isolator, circulator, production casing, wellhead assembly.
(3) twice well cementing operation: slush pump or the cementing truck mud of fetching water is adopted in for the first time well cementation, Gu instable layer lower well section, cement paste proportion is 1.86, cement consumption calculates by the bottom annular space, makes the inside and outside cement that is full of equably of lower parts casing pipe, and adopts and return round-robin method, the above cement paste of circulator is developed, prevent on the cement that run-a general's circulator is dead or stop up and top well section can't be cemented the well, wait solidifyingly after three days, carry out second time to cement the well; Cementing truck is adopted in for the second time well cementation, after the lower well section thes cement solidifies, Gu caving ground top well section, cement paste proportion 1.86, cement weight calculates according to the upper sleeve annular space, makes the above outer ring space of isolator be full of equably cement paste, finishes well cementing operation.
(4) examination and completion: wellhead assembly is installed, adopt hydraulic test pump to the cementing quality pressure testing inspection of hunting leak, without water burst or drainage, the leak detection leak test is qualified, show that caving ground and bottom working seam isolate, satisfy the needs of water soluble method rock salt mining.
Claims (3)
1. rock salt well construction unstability stratum treatment technology is characterized in that: it is isolated, cements the well for twice to finish the drilling well on unstability rock salt stratum and become well operations the unstability stratum by adopting, and it may further comprise the steps:
(1) drillng operation: adopt three gear wheel drilling wells, adopt layer so that drill bit arrives the bottom purpose of unstability stratum covering;
(2) isolation technology: after drillng operation is finished, carry out casing job and multiple sleeve pipe is transferred to purpose adopt layer, described lower pipe sequentially is followed successively by: tail pipe, production casing, isolator, circulator, production casing, wellhead assembly;
(3) twice well cementing operation: the solid instable layer lower well section of for the first time well cementing operation; The solid caving ground top of for the second time well cementing operation well section;
(4) check and accept and completion: adopt pressure testing equipment to the cementing quality pressure testing check of hunting leak.
2. rock salt well construction unstability according to claim 1 stratum treatment technology, it is characterized in that: slush pump or the cementing truck mud of fetching water is adopted in for the first time well cementing operation in the described step (3), described cement paste proportion is 1.86, make the inside and outside cement that is full of equably of lower parts casing pipe, and adopt and return round-robin method, the above cement paste of described circulator is developed, wait and coagulate after three days, carry out the well cementing operation second time; The cementing truck mud of fetching water is adopted in for the second time well cementing operation, and described cement paste proportion 1.86 makes the above outer ring space of described isolator be full of equably cement paste, finishes well cementing operation.
3. rock salt well construction unstability according to claim 1 stratum treatment technology, it is characterized in that: the pressure testing equipment in the described step (4) is hydraulic test pump.
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| CN2012105460089A CN103032050A (en) | 2012-12-14 | 2012-12-14 | Unstable formation treatment technique for rock salt well construction |
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| CN2012105460089A CN103032050A (en) | 2012-12-14 | 2012-12-14 | Unstable formation treatment technique for rock salt well construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361001A (en) * | 2018-01-10 | 2018-08-03 | 河南中源化学股份有限公司 | A kind of deep trona drilling well exploitation cementing stage technique |
| CN109630064A (en) * | 2018-11-19 | 2019-04-16 | 湖北双环科技股份有限公司 | A kind of old salt well remodeling method |
Citations (5)
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| AU5337194A (en) * | 1992-10-22 | 1994-05-09 | Shell Internationale Research Maatschappij B.V. | Drilling and cementing a well |
| CN101076652A (en) * | 2004-12-15 | 2007-11-21 | 国际壳牌研究有限公司 | Wellbore system extending through a salt layer |
| CN201152163Y (en) * | 2008-02-04 | 2008-11-19 | 新疆蓝海石油工程技术有限责任公司 | Sieve tube semi-cementing well stage collar |
| CN101432501A (en) * | 2006-05-05 | 2009-05-13 | Bj服务公司 | Multi-zone, single trip well completion system and methods of use |
| CN201386535Y (en) * | 2009-02-23 | 2010-01-20 | 中国石化集团胜利石油管理局钻井工艺研究院 | Hydraulic isolator applicable to oil drilling and well completion |
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- 2012-12-14 CN CN2012105460089A patent/CN103032050A/en active Pending
Patent Citations (5)
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| AU5337194A (en) * | 1992-10-22 | 1994-05-09 | Shell Internationale Research Maatschappij B.V. | Drilling and cementing a well |
| CN101076652A (en) * | 2004-12-15 | 2007-11-21 | 国际壳牌研究有限公司 | Wellbore system extending through a salt layer |
| CN101432501A (en) * | 2006-05-05 | 2009-05-13 | Bj服务公司 | Multi-zone, single trip well completion system and methods of use |
| CN201152163Y (en) * | 2008-02-04 | 2008-11-19 | 新疆蓝海石油工程技术有限责任公司 | Sieve tube semi-cementing well stage collar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361001A (en) * | 2018-01-10 | 2018-08-03 | 河南中源化学股份有限公司 | A kind of deep trona drilling well exploitation cementing stage technique |
| CN109630064A (en) * | 2018-11-19 | 2019-04-16 | 湖北双环科技股份有限公司 | A kind of old salt well remodeling method |
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Application publication date: 20130410 |