Plug-back Cementing Methods
- C.P. Parsons (Halliburton Oil Well Cementing Co.)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1936
- Document Type
- Journal Paper
- 187 - 194
- 1936. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 4.1.5 Processing Equipment, 1.14 Casing and Cementing, 1.10 Drilling Equipment, 5.3.2 Multiphase Flow, 3 Production and Well Operations, 2.2.2 Perforating
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During the past year considerable interest has been shown in cementingoperations for shutting off bottom water, whip stocking, etc. A number ofplug-back methods have been used, with various adaptations for specialconditions, but those described in this paper are representative of the methodsnow in use.
Conditioning the Well
Various preliminary operations for improving the results from plugbackoperations have been evolved. In one method, a nitroglycerin shot is dischargedat the upper portion of the formation to be plugged off, the purpose being tomake a wide place in the hole in order to give the cement a more secure anchoragainst thrust pressure of the water against the bottom of the cement plugafter the well is again put on production. Another is intended to attain asimilar result by under-reaming a wide place in the hole by means of a rotarywall scraper. In one well in which this device was used there was a water sandat the bottom of the well immediately below the cap rock above which the oilsand occurred. Before the plugging back operation, the water sand wasunderreamed in an attempt to get a square shoulder on the underside of the caprock, in order to prevent the water from breaking in over the top of the cementplug after the well should be put on production, and also to get a more secureanchor for the cement plug against the thrust pressure of the water againstit.
As an aid in calculating the amount of cement required to fill a given amountof hole to be plugged back, a device has been developed for measuring andrecording the irregularities and cavities in open holes, called an"open-hole recording caliper." It consists of a steel shell, 5 in. indiameter, which encloses a recording mechanism that receives impressions fromfour movable arms that make sliding contact with the wall of the hole. The armsoperate a ratchet, which raises and lowers a recording stylus against a chart.Each arm registers its own radius. The device is run into a well on a steelmeasuring line.
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