Well stimulation process and low velocity explosive formulation

Details Well stimulation process and low velocity explosive formulation Well stimulation process and low velocity explosive formulation

1987-09-16

1988-08-16

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Containing nitrated organic compound

Nitroglycerine

149 11, 149 88, 149101, 1491096, 102301, 102313, C06B 2514

Patent

active

047642319

ABSTRACT:
Well stimulation involving use of a liquid explosive composition in the explosive fracturing of subterranean formations such as oil and gas bearing formations. An explosive formulation comprising a nitrate ester explosive component and a phlegmatizer component is introduced into a well penetrating the formation to be fractured. The phlegmatizer component is an alkyl or alkoxy diester which is mixable with the nitrate ester and can be varied in concentration to control the detonation velocity and maximum explosive pressure. Examples of phlegmatizing agents include alkyl or alkoxy alkyl esters of adipate or azelaic acids such as dibutoxyethyl adipate or diisobutyl azelate or polyethylene glycoxy-based diesters such as triethylene glycol dipelargonate. After the formulation is detonated to fracture the formation, the well is placed on production to recover hydrocarbons at an increased rate.

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Uren, Petroleum Production Engineering-Oil Field Development, 3rd Edition, 1952 McGraw Hill, "Use of Explosives in Well Completion," pp. 588-593.
Uren, Petroleum Production Engineering-Oil Field Exploitation, 3rd Edition, 1953 McGraw Hill, pp. 165 and 419-424.

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