for costly ctu and eliminates the possibility of difficulties with the ctu such as loss or sticking of ctu downhole thus the invention not only provides a method of acid washing for wells that are too long for ctu but also an alternative to ctu for wells of shorter length where ctu could be used use of the method of the invention avoids the necessity of ctu since the fluids can be pumped for example using a high pressure pump into the primary well and received out of the secondary well this avoids many of the shortcomings of ctu including mechanical limitations that typically make it difficult to treat long wells for example those in excess of one kilometer also additional wellbore operations such as ctu increase costs mechanical risks and risks of damage to the fractured intervals the current invention advantageously can be used with both short and long wells but provides the added advantage of promoting production from long horizontal wells that otherwise would not be producing at the desired rates the current method also advantageously allows for exposing the length of the wellbore to acid to allow cleaning of the formation from the drilling fluid left after the completion of the drilling or workover operations since the acid will dissolve the drilling fluid materials that have moved into the formation this also provides increase in production this acidizing technique enables the removal of the formation damage created during the drilling at the same time maximizing the stimulation of the entire horizontal section which will result in improving the productivity and thereby producing hydrocarbons at a higher rate the method of the invention is useful for single or multi lateral long horizontal wells if two multilateral horizontal wells are connected downhole the.