(April 30, 2019, 10:15 AM EDT) -- HOUSTON — An oil and gas exploration company engaged in hydraulic fracturing filed for bankruptcy in Texas federal bankruptcy court on April 14, contending that downturns in the oil market eventually made it impossible to “right size” its balance sheet (In re: Jones Energy Inc., No. 19-32112, Ch. 11, S.D. Texas Bkcy.)....