PROCESS OF PRESSURE GROUTING OF WELLS

hole drilling, pressure grouting of casing string. SUBSTANCE: hole in clay roof is completed. Sump of smaller diameter is made. Casing string with shoe is run into hole. Shoe is fitted with container carrying reagent-cement mortar setting accelerator. Shoe is placed above sump before pressure grouti...

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Bibliographische Detailangaben
Hauptverfasser:	JAKOVENKO A.A, DORODNOV I.P, SHAMANOV S.A, VJAKHIREV V.I
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	hole drilling, pressure grouting of casing string. SUBSTANCE: hole in clay roof is completed. Sump of smaller diameter is made. Casing string with shoe is run into hole. Shoe is fitted with container carrying reagent-cement mortar setting accelerator. Shoe is placed above sump before pressure grouting. Cement mortar is injected. It is injected in portions having different time of setting. Finish of setting of one portion is start of setting of next portion. Separator and forcing fluid are injected till "stop" pressure is achieved. Casing string is forced into sump. Container is open. Reagent-cement mortar setting accelerator is injected into portion of cement mortar in zone of shoe. Process secures tightness of hole clearance and insulation of pools up to well-head, if necessary. EFFECT: higher efficiency of process. 1 cl