Thru-Tubing Sand Control Techniques Reduce Completion Costs
- H.L. Restarick (Halliburton Energy Services) | S.H. Fowler Jr. (Halliburton Energy Services) | W.P. Sedotal (Halliburton Energy Services)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 1994
- Document Type
- Journal Paper
- 236 - 243
- 1994. Society of Petroleum Engineers
- 2.4.5 Gravel pack design & evaluation, 3 Production and Well Operations, 4.5 Offshore Facilities and Subsea Systems, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.6.4 Drillstem/Well Testing, 1.10 Drilling Equipment, 4.1.5 Processing Equipment, 2.4.3 Sand/Solids Control, 1.6.1 Drilling Operation Management, 1.14 Casing and Cementing, 1.8 Formation Damage, 4.1.2 Separation and Treating, 2.4.4 Screen Selection, 2.2.2 Perforating, 2.7.1 Completion Fluids, 1.6 Drilling Operations, 2 Well Completion, 3.2.5 Produced Sand / Solids Management and Control, 1.1.2 Authority for expenditures (AFE)
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Sand-control problems in existing wells typically result from improper completion techniques or changes in reservoir properties. While recompletion of many of these wells with conventional sand-control methods and workover rigs is economically unfeasible, enhancements to gravel-pack fluid systems, downhole equipment, and service capabilities have increased success and reduced costs in through-tubing recompletions, providing new options to the operator for successful sand control in existing wells.
The most effective sand-control techniques are those implemented early in the life of the well before sand production becomes a problem. These techniques are carried out before the onset of water production or before formation damage occurs from formation disturbance or subsidence. High production rates cause excessive stress on weakly consolidated formations and exceed the capability of the cement material to bond the sand grains together. Once sand is produced as a result of formation damage, effective sand-control methods become more difficult and harder to justify. Marginal wells producing sand with poor reserves may not support the cost of a major workover program. Remedial options include sand bailing with wireline and sand washing with coiled tubing, but these only provide temporary solutions to sand-production problems.
Although a low authority-for-expenditure budget, limited reserves, and a sanded-up well can limit the feasibility of a major workover, a number of products and services are available to the industry today that increase the success of through-tubing sand-control techniques. There are two categories of through-tubing sand control: mechanical methods, which include the use of small-diameter gravel-pack screens, and chemical methods, which bond the formation sand in place. The success of these methods has been aided by advances in wellbore-cleaning techniques that use high-pressure-fluid jets in conjunction with coiled tubing to clean tubulars, liners, perforation tunnels, or existing screens to prepare for the through-tubing sand-control operations.
|File Size||1 MB||Number of Pages||8|