For coiled tubing stimulations each CT size offers various advantages and limitations, including but not limited to; maximum pump rate, logistics, fatigue life and cost. In extended reach (ERD) wells CT Tractors can be utilized to improve coiled tubing (CT) access of the horizontal section of the well-bore. The objective of this study was to compare the performance of a slim CT tractor with various sizes of CT, namely 2" and 2-3/8". Tubing Force Analyses (TFA) were performed for a group of wells using CT modeling software with friction coefficients back modeled from previous CT interventions in the same field. Three similar candidate wells were chosen where CT was predicted to lockup prior to reaching Total Depth (TD) without the use of a tractor, and where TD was able to be reached with the use of a tractor for both 2" and 2-3/8" CT. During field operations down-hole pressure sensors and tension compression sub were included in the BHA to verify the effectiveness of the CT tractor with live readings. The field operations demonstrated that 2-3/8" CT reached further in the wellbore prior to activating the tractor. The operations confirmed that the slim hydraulic CT Tractor was able to pull both 2" and 2-3/8" CT a significant distance past CT lockup depth. Matrix stimulations were successfully performed on each of the 3 wells. The study concludes that both 2" and 2-3/8" CT combined with a hydraulic slim tractor were both appropriate solutions to access extended reach open hole for Matrix stimulation operations. Production engineers have case study results to show the effectiveness of using 2" vs 2-3/8" CT with a slim hydraulic tractor to access ERD wells for stimulation operations.

Reasons for internal and external valve damage are varied in the industry. Valve damage can occur due to irregular preventive maintenance, sand erosion, internal and external corrosion, improper materials selection, and/or due to operating the valve outside of its operating pressure and temperature ranges1. This paper will focus only on valve cavitation related damage, which happens on water choke valves. The main purpose of this paper is to demonstrate a trial installation of multistage choke valve technology in water lines that reduces high pressure drops across water injection choke valves. The trial test was conducted on two single-stage choke valves installed upstream of two water injection wellheads, which were completed in two different reservoirs. The selected single-stage choke valves were experiencing high noise and vibration levels where operators could barely meet the required water injection rate for each well. Different surface mitigation measures were evaluated to overcome this serious issue prior to conducting the trial installation of the multistage chokes. The field water injection system was studied from the water injection plant (WIP) where the water injection centrifugal pump (3000 psig) is located, through the water lines, fittings and valves all the way to the water injection wellheads. Results from the trial test show that implementing multistage choke valve technology can prevent high noise and vibration levels and allow the target water injection rate per well to be met.