CN108979586B - Method for returning height of cement slurry for surface layer well cementation of deep well - Google Patents
Method for returning height of cement slurry for surface layer well cementation of deep well Download PDFInfo
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- CN108979586B CN108979586B CN201810871134.9A CN201810871134A CN108979586B CN 108979586 B CN108979586 B CN 108979586B CN 201810871134 A CN201810871134 A CN 201810871134A CN 108979586 B CN108979586 B CN 108979586B
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- diameter expansion
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention discloses a method for returning high cement slurry for surface layer well cementation of a deep well, which comprises the following steps: after the 600-1200mm well is sprayed, the guide pipe with the corresponding size is put into the well and is connected with the well head in series and locked, so that the well head is seated on the anti-sinking plate; drilling 480-720mm borehole in a rotating manner, and setting 380-420mm casing string; pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve; according to the field condition, sequentially pumping the spacer fluid and the cement first slurry; the ROV observes the return condition, observes the return of the display liquid and inversely calculates the hole diameter expansion rate of the 480-plus 720mm well; pumping cement tail slurry according to the well diameter expansion rate, wherein the pumping amount is equal to the volume of the spacer fluid (1 + the well diameter expansion rate); replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation. The invention can make the cement slurry spread over the whole surface annular space, is beneficial to improving the cementing quality of the surface casing, improves the field operation safety, and can be widely applied in the field of petroleum deepwater drilling.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas resource drilling engineering, and particularly relates to a method for returning height of cement slurry for surface layer well cementation of a deep well.
Background
The deep sea drilling and exploitation technology mainly refers to the positioning, installation and control technology of underwater wellhead facilities in an sea area below 300 meters of water depth, the stability design, construction and control technology and the like of underwater structures in the sea area below 300 meters of water depth, the safety analysis and risk control of the deep sea drilling and exploitation technology; the well drilling and completion technology mainly refers to the underbalanced well drilling and completion technology of offshore oil and gas fields; the logging technology refers to nuclear magnetic resonance logging technology.
During ocean deepwater drilling operation, due to the influence of factors such as ocean currents, wind waves and operation, a drill string is easy to swing during drilling, the borehole diameter of a drilled borehole is seriously enlarged, if the cement return height is estimated by adopting a traditional estimation method, the cement amount in a surface casing annulus is possibly insufficient, the surface cementing quality is poor, the wellhead stability is influenced, too much cement slurry is pumped, the operation time is reduced, and cementing materials are wasted, so that the method for returning the height of the surface cementing slurry of the deepwater well is provided.
Disclosure of Invention
Compared with the prior art, the method can determine the hole diameter expansion rate, can make the cement slurry fully distributed in the whole surface annulus, is beneficial to improving the well cementation quality of a surface casing, avoids the waste shortage of well cementation materials, and provides the method for the deep well surface well cementation cement slurry height return.
The invention aims to solve the technical defects, adopts a modified technical scheme, and provides a method for returning the height of cement slurry for surface layer well cementation of a deep well, which comprises the following steps:
(1) after the 600-1200mm well is sprayed, the guide pipe with the corresponding size is put into the well and is connected with the well head in series and locked, so that the well head is seated on the anti-sinking plate;
(2) drilling 480-720mm borehole in a rotating manner, and setting 380-420mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 480-plus 720mm well hole in the step (2);
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
As a further preferred mode of the present invention, there is further included the steps of,
(1) after the 914.4 mm well is jetted, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 660.4mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid and inversely calculates the hole diameter expansion rate of the 660.4mm well;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
As a further preferred mode of the present invention, there is further included the steps of,
(1) after the 1200mm well is sprayed, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 720mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 720mm well hole in the step;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
Compared with the prior art, the method is beneficial to ensuring the stability of the deep well mouth and improving the safety of field operation; the advantages and effects are as follows:
the method can accurately estimate the hole diameter expansion rate, avoid the pumping amount of cement slurry from being too small, and avoid the problem of poor well cementation quality;
the invention can make the cement slurry spread over the whole surface annular space, which is beneficial to improving the cementing quality of the surface casing and improving the safety of field operation;
the method is simple, convenient to operate and widely applicable to the field of petroleum deepwater drilling.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a method for returning high cement slurry for surface cementing of a deep well comprises the following steps:
(1) after the 600-1200mm well is sprayed, the guide pipe with the corresponding size is put into the well and is connected with the well head in series and locked, so that the well head is seated on the anti-sinking plate;
(2) drilling 480-720mm borehole in a rotating manner, and setting 380-420mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 480-plus 720mm well hole in the step (2);
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
The method also comprises the following specific steps of,
(1) after the 914.4 mm well is jetted, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 660.4mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid and inversely calculates the hole diameter expansion rate of the 660.4mm well;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
The method also comprises the following specific steps of,
(1) after the 1200mm well is sprayed, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 720mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 720mm well hole in the step;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
The parameter table of the measuring and calculating method of the invention is as follows: TABLE 1
The parameter table of the traditional measuring and calculating method is as follows: TABLE 2
In summary, it is obvious from tables 1 and 2 that compared with the prior art, the method can determine the borehole diameter expansion rate, can make cement slurry fully distributed in the whole surface annulus, is beneficial to improving the well cementation quality of a surface casing, and avoids the defect of waste of well cementation materials; the invention can make the cement slurry spread over the whole surface annular space, is favorable to improving the cementing quality of the surface casing, improve the safety of field operation; the method is simple, is convenient to operate, and can be widely applied to the field of petroleum deepwater drilling.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A method for returning height of cement slurry for surface layer cementing of a deep well is characterized by comprising the following steps:
(1) after the 600-1200mm well is sprayed, the guide pipe with the corresponding size is put into the well and is connected with the well head in series and locked, so that the well head is seated on the anti-sinking plate;
(2) drilling 480-720mm borehole in a rotating manner, and setting 380-420mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 480-plus 720mm well hole in the step (2);
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
2. The method for raising the surface cementing cement slurry of the deep well according to the claim 1, characterized in that the method comprises the following steps,
(1) after the 914.4 mm well is jetted, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 660.4mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid and inversely calculates the hole diameter expansion rate of the 660.4mm well;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
3. The method for raising the surface cementing cement slurry of the deep well according to the claim 1, characterized in that the method comprises the following steps,
(1) after the 1200mm well is sprayed, a guide pipe string with a corresponding size is put into the well head and locked, so that the well head is seated on the anti-sinking plate;
(2) rotationally drilling a 720mm borehole, and setting a 380mm casing string;
(3) pouring a valve, introducing water to test the pressure, and pumping display liquid with the volume 0.02-0.04 time that of the 508mm sleeve;
(4) according to the field condition, sequentially pumping the spacer fluid and the cement first slurry;
(5) the ROV observes the return condition, observes the return of the display liquid, and inversely calculates the hole diameter expansion rate of the 720mm well hole in the step;
(6) pumping cement tail slurry according to the hole diameter expansion rate, wherein the pumping amount is equal to the volume x (1 + hole diameter expansion rate) of the spacer fluid;
(7) replacing seawater, relieving pressure, checking reflux, and if normal, transferring to next step, if abnormal, holding pressure for waiting coagulation.
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| US6457524B1 (en) * | 2000-09-15 | 2002-10-01 | Halliburton Energy Services, Inc. | Well cementing compositions and methods |
| CN101417868A (en) * | 2008-11-18 | 2009-04-29 | 中国石油集团川庆钻探工程有限公司 | Physical foam cementing concrete |
| CN103224772B (en) * | 2013-04-08 | 2015-09-09 | 中国石油天然气股份有限公司 | A kind of cementing slurry, Preparation Method And The Use |
| CN104632125B (en) * | 2014-12-30 | 2018-03-13 | 中国石油天然气集团公司 | A kind of method based on calliper log data-guiding cementing operation |
| CN108086943A (en) * | 2017-12-11 | 2018-05-29 | 中国海洋石油集团有限公司 | Three open time deepwater drilling annular pressure management method |
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