One of the most perspective areas in the field of drilling is small diameter well (SDW) construction. The early SDW construction has no proper development to a whole number of reasons. At present time the main questions are solved. The reducing of casing strings diameter and weight-supporting capacity of drilling rig leads to a well construction cost downsizing up to 25%. In 2010 LUKOIL-PERM LLC was drilled the first small diameter multilateral well and it profitability was confirmed. In 2014 the first directional well with horizontal completion was drilled. In 2017 LUKOIL-PERM LLC was drilled the first multihole small diameter well. Initial flow of multihole small diameter well was 18,8 t/day, that is more than 3,2 times exceed the flow rate of the surrounding directional small diameter wells and high by 1,8 times the horizontal small diameter wells.
The article gives the minimization risks solutions by the construction of first multihole small diameter well and description the drilling process. The analysis of SDW production evolution shows that a production decline rate of SDW and SDW with horizontal completion is comparable with the similar design gage diameter wells. The results of SDW construction are summarized in article. Technical and technological solutions, which favour to an additional reduction in construction period and material costs, are presented. The perspectives of small diameter wells drilling are marked out.
Because the SDW cost minimization was reached, it is necessary to revise the profitable flow rate criterion for wells with various architectures and draw the technical and technological assessment SDW for deep geological horizons, and also implement a dual completion. In connection with deterioration of residual recoverable reserves and new opportunities in oil production area, a part of SDW construction will be increase in total drilling content. Also small diameter well should substitute for sidehole with up to 1000 m length.
References
1. Meshcheryakov K.A., Yatsenko V.A., Il'yasov S.E., Okromelidze G.V., Drilling of small diameter wells as a way to reduce costs in the construction of development and exploratory wells (In Russ.), Territoriya NEFTEGAZ, 2013, no. 10, pp. 26–29.
2. Kul'chitskiy V.V., Shchebetov A.V., Aygunyan V.V., The drilling of small diameter wells for the development of the Bazhenov Suite (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 9, pp. 88–89.
3. Meshcheryakov K.A., Il'yasov S.E., Okromelidze G.V., Yatsenko V.A., Drilling of the sidetrack from the small diameter well (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 8, pp. 45–47.
