CN101230778B - Technique of gas drilling post-infusion cement slurry - Google Patents
Technique of gas drilling post-infusion cement slurry Download PDFInfo
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- CN101230778B CN101230778B CN 200810045393 CN200810045393A CN101230778B CN 101230778 B CN101230778 B CN 101230778B CN 200810045393 CN200810045393 CN 200810045393 CN 200810045393 A CN200810045393 A CN 200810045393A CN 101230778 B CN101230778 B CN 101230778B
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Abstract
The invention relates to a technic method for cement slurry injection after air drilling which is used for well cementation after the air drilling, and belongs to the technical field of well completed technology after the air drilling. The invention comprises the processes of cement slurry preparation, cement slurry pump casting by a spile, drilling fluid injection in a sleeve when cement slurry is injected by a pump, etc. The invention adopts a method of pretreating a dry well wall, designs the technological method for cement slurry injection after air drilling, solves the complicated situations that the cement slurry is injected into the dry well wall for well cementation after the air drilling to cause the dry well wall absorbs water in large amount, generate well lose, instability and collapse of the well wall, etc. The invention has the advantages that external squeeze pressure forced on a back pressure valve and the sleeve at the bottom is lowered, contact time of the cement slurry and the well wall is increased, etc., and particularly has favorable implementation effect in a well bore which has different formation pressure coefficient. The invention has the characteristics of making the well wall of the construction stable and reducing construction time.
Description
Technical field: a kind of process of gas drilling post-infusion cement slurry, being used for oil and gas exploration, to adopt gas be well cementation after medium is implemented drilling well, belongs to the well-completing process technical field behind the gas drilling.
Background technology: in the prior art; the main conventional mud drilling fluid that adopts is implemented drilling well for the drilling well medium; owing to be subjected to the influence of wellbore mud density; bit speed is slower always; different situations according to the stratum; sometimes per hour only less than one meter rate of penetration; when running into bad ground; the drilling machinery drilling speed is slower; in order to accelerate the exploration and development speed of petroleum gas; adopted in recent years with gas is the boring method of medium; the method that adopts gas drilling is at protection and discovery reservoir; aspects such as raising bit speed have clear superiority; can effectively shorten drilling time; reach the purpose that shortens drilling period; but at present after the well finishing drilling of adopting gas to bore; general way is before cementing operation; also want in well, to pump into drilling fluid earlier and remove to replace the gas of staying in the well; and then carry out the setting of casing cementing operation; the problem of this well shaft fixing technology method is: do not have liquid in the well during owing to gas drilling; the borehole wall is done; suction that will be a large amount of when the borehole wall of doing touches the cementing slurry of drilling fluid and injection; the borehole wall after the suction can produce as leakage; borehole wall suction unstability; complex situations such as the borehole wall collapses; make and to creep into loss greatly fast by what gas drilling was obtained; it is particularly outstanding particularly to have in the pit shaft of a plurality of Different Strata pressure coefficients performance in the well; in order to solve this potential problem; also have at the drilling liquid technology that has a plurality of Different Strata pressure coefficients in a bite well and improve; but still can not avoid the generation of down hole problem; cause to carry out normal well cementing operation, finally incur loss through delay the cycle of drilling well.
Goal of the invention: the objective of the invention is to overcome and after the enforcement gas drilling is finished, continue in the existing technology to adopt drilling fluid to carry out the shortcoming that the borehole fluid displacement brings, the method that employing is handled dry-well has designed a kind of process of gas drilling post-infusion cement slurry.
The present invention is achieved in that earlier to adopting gas be that the pit shaft of drilling well medium is handled, and is lowered to sleeve pipe and intubate then, carries out according to following step after finishing:
1, prepares cement paste neck slurry and the required cement amount of cement paste tail slurry by the additional 10t cement of the effective annular space capacity of full well earlier;
2, by the intubate that has been lowered to the annular space elder generation pump priming mud neck slurry outside sleeve pipe and between the borehole wall, pump priming mud tail slurry returns out ground until the neck slurry then, and also infusion is implemented anti-the filling to the loss horizon of design after waiting the cement paste initial set more for the first time;
3, in pump priming mud, in sleeve pipe, pour into drilling fluid;
4, in the process of pump priming mud, during the infusion pressure stability, improve the infusion discharge capacity of cement paste gradually;
5, after cement injection is finished, if well head is seen do not return, anti-cement grouting is to well head;
Described neck slurry is that density is lower than 1.70g/cm
3Neat slurry; Described tail slurry is that density is greater than 1.88g/cm
3G class g cement slurry;
Advantage of the present invention and beneficial effect are: pour into drilling fluid in the sleeve pipe that is lowered in cement injection, can reduce back pressure you and the suffered outer crowded power of bottom sleeve; Earlier by the lower cement paste neck slurry of intubate infusion density,, also reach the purpose that increases cement paste and borehole wall time of contact simultaneously so that reach the neck slurry is taken impurity in the drilling well gas of remnants and the well out of ground during operation between the borehole wall and sleeve pipe purpose; In the process of pump priming mud tail slurry, when the infusion pressure stability, show wellbore stability, at this moment progressively improve the infusion discharge capacity of cement paste and can accelerate speed of application, reduce the time of construction.
The specific embodiment: the following embodiments of the invention that provide:
The present invention constructs according to following manner: before implementing method of the present invention, be that the pit shaft of drilling well medium is handled to adopting gas earlier, be lowered to sleeve pipe and intubate then, cement injection in accordance with the following methods after finishing:
The first step is prepared the quantity of cement paste neck slurry and tail slurry earlier by the effective annular space capacity of full well;
Second step, pump priming mud tail slurry returned out ground until the neck slurry then by intubate first pump priming mud neck slurry to sleeve pipe outside and between the borehole wall, and also infusion is implemented anti-filling to the loss horizon of design after waiting the cement paste initial set more for the first time;
The 3rd step poured into drilling fluid in sleeve pipe in pump priming mud, keep the inside and outside pressure balance of sleeve pipe, reduced back pressure you and the suffered outer crowded power of bottom sleeve;
The 4th step during the infusion pressure stability, was improved the infusion discharge capacity of cement paste gradually in the process of pump priming mud, finish until infusion;
The 5th step if well head is seen was not returned after the cement paste of preparation has injected, and then anti-cement grouting is to well head;
Embodiment: implement well and use the well cementation of Φ 244.5mm protective casing, process is as follows: after sleeve pipe and intubate are gone in this down-hole, adopt the construction of two-shipper pump cementing truck, implement the injection of cement paste, discharge capacity is controlled at 30～35l/s, pressure stability in the infusion process illustrates the wellbore stability of down-hole, the complex situations that leakage take place and block, therefore, under the prerequisite of wellbore stability, improve the pressure of infusion as far as possible, accelerated displacement velocity, inject density altogether and be lower than 1.70g/cm
3Neat slurry neck slurry 10cm
3, injecting density then is 1.88g/cm
3The high anti-cement paste tail slurry 88t of G level oil well, sealing 0～449.58m overlaps well section and 449.58m～1648.83m barefoot interval, returns out cement paste 15.5m
3, in the cementing process simultaneously in sleeve pipe with drilling rod outside annular space pour into clear water 43.0m
3, effectively reduced the suffered outer extruding force of back pressure valve and bottom sleeve, in cementing practice, from beginning cemented 30 minutes, blowdown pipeline outlet igniting combustion, flame is high about 1 meter, has finished the limit emptying, edge point fire, the construction task of limit well cementation.
Claims (2)
1. the process of a gas drilling post-infusion cement slurry is characterized in that:
The first step is prepared cement paste neck slurry and the required cement amount of cement paste tail slurry by the additional 10t cement of the effective annular space capacity of full well earlier;
Second step, pump priming mud tail slurry returned out ground until the neck slurry then by the annular space elder generation pump priming mud neck slurry of intubate outside sleeve pipe and between the borehole wall;
The 3rd step poured into drilling fluid in sleeve pipe in pump priming mud;
The 4th step during the infusion pressure stability, was improved the infusion discharge capacity of cement paste gradually in the process of pump priming mud;
After the 5th step, cement injection was finished, if well head is seen do not return, anti-cement grouting is to well head.
2. the process of gas drilling post-infusion cement slurry according to claim 1 is characterized in that: described neck slurry is that density is lower than 1.70g/cm
3Neat slurry, described tail slurry is that density is greater than 1.88g/cm
3G class g cement slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810045393 CN101230778B (en) | 2008-02-21 | 2008-02-21 | Technique of gas drilling post-infusion cement slurry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810045393 CN101230778B (en) | 2008-02-21 | 2008-02-21 | Technique of gas drilling post-infusion cement slurry |
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| CN101230778A CN101230778A (en) | 2008-07-30 |
| CN101230778B true CN101230778B (en) | 2011-03-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO336533B1 (en) * | 2008-11-03 | 2015-09-21 | Statoil Asa | System for mooring a large vessel |
| CN101962530B (en) * | 2010-10-15 | 2013-01-02 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Oil and gas field region well-prospecting and well-cementing cement secondary slurry process |
| CN104047556B (en) * | 2014-06-16 | 2016-07-27 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of method preventing long 7 oil shales from caving in |
| CN109517589B (en) * | 2017-09-19 | 2021-03-16 | 中国石油化工股份有限公司 | Oil-gas well cementing dry-method well cementing low-density cement slurry and preparation method thereof |
| CN111058794B (en) * | 2019-11-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
| CN110939405A (en) * | 2019-12-31 | 2020-03-31 | 北京宝沃石油技术有限责任公司 | Process method for injecting cement in well cementation project |
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Owner name: CHINA PETROLEUM GROUP CHUANQING DRILLING ENGINEER Free format text: FORMER OWNER: SICHUAN PETROLEUM ADMINISTRATION Effective date: 20080905 |
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Effective date of registration: 20080905 Address after: Overlooking the green road Chengdu city Sichuan province 1 No. 3 oil Chinese Chuanqing Drilling Engineering Technology Information Office Post encoding: 610051 Applicant after: Chuanqing Drilling Engineering Co., Ltd. of China National Petroleum Corporation Address before: Postal code three, section 610051, Jiao Qing Road, Sichuan, Chengdu Applicant before: Sichuan Petroleum Administration |
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Effective date of registration: 20200930 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: Overlooking the green road Chengdu city Sichuan province 610051 1 No. 3 oil China Chuanqing Drilling Engineering Technology Information Office Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |
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