FIELD: mining.
SUBSTANCE: invention relates to the field of mining engineering, in particular, to methods for pulling casing strings out of wells. Method for casing string pulling out incorporates installation of piston baffle, plugging of casing string top end, and injection of fluid into the space between said piston baffle and plugged end of casing string. At that, the outer string (with bigger diameter) is pulled out first, and the last pulled is the central string (with the smallest diameter). In each successive pulled casing string a piston baffle is installed in top end of the string with smaller diameter, then a plug is installed in top end of pulling string and fluid is injected into the space between said piston baffle and plug.
EFFECT: improved efficiency of well dismantling due to saved materials, time, and cost of pulling casing tubes out of the well.
2 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| PROCEDURE OF STABILISATION OF SEA ONE-COLUMN DRILLING BASE AND INSTALLATION FOR IMPLEMENTING THIS PROCEDURE | 2008 |
|
RU2362869C1 |
| DEVICE FOR WELL DRILLING AT WATER AREAS | 2011 |
|
RU2481453C1 |
| CASING COLUMN FOR PERCUSSION-DRIVING DRILLING ON SEA | 2009 |
|
RU2387790C1 |
| METHOD OF PULLING-OUT CASINGS | 0 |
|
SU848573A1 |
| METHOD FOR PIPE-DRIVING DRILLING IN WATER AREAS AND DRILLING TOOL FOR ABOVE METHOD REALIZATION | 2004 |
|
RU2282707C2 |
| CORE EQUIPMENT FOR ROTARY BORING WITH INTERNAL BOTTOMHOLE LIQUID CIRCULATION | 2008 |
|
RU2377387C1 |
| METHOD AND DEVICE FOR SINGLE-BASE WELLHEAD PLATFORM MOUNTING AND STABILIZATION ON SEAFLOOR | 2004 |
|
RU2278943C2 |
| METHOD FOR DOUBLE STRING RUNNING IN AND ADDING NEW JOINTS THERETO BY DRILLING FROM FLOATING VESSELS | 1991 |
|
RU2013516C1 |
| DEVICE FOR DRILLING OFFSHORE WELLS WITH REVERSE FLUSHING | 0 |
|
SU825828A1 |
| DRILLING TOOL | 0 |
|
SU962574A2 |
