A Wireline Completion Technique for Sand Control
- C.P. Lanmon (Schlumberger Well Services)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- June 1967
- Document Type
- Journal Paper
- 741 - 744
- 1967. Society of Petroleum Engineers
- 3.2.5 Produced Sand / Solids Management and Control, 4.1.5 Processing Equipment, 2.2.2 Perforating, 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 1.14 Casing and Cementing, 1.6 Drilling Operations
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A new wireline technique provides fast, economical and sand-free completions in zones noted for sand-production problems. On a single trip in the well, the wireline sand consolidation tool perforates the casing with two holes ]and squeezes consolidating plastic into the formation. The entire operation is performed in 3 hours or less, and the well can immediately be put on production through the treated perforations. One or two pairs of treated perforations are usually adequate for allowable production.
The purpose of any sand consolidation treatment is to convert the loose sand behind the casing into a strong. permeable, synthetic sandstone filter. This filter allows fluid production into the casing but prevents surrounding formation sands from flowing. The filter is formed by injecting plastic into the formation. The plastic cements the sand grains together, but still provides interconnecting pore spaces to permit free flow of fluid. By its very nature, the consolidated formation sand makes a filter perfectly sized to keep the unconsolidated sand from filtering through. When treating a well by conventional sand consolidating methods, up to several hundred gallons of treating fluids are pumped through multiple perforations into the formation. This is usually done by pumping the treating fluid from the surface through the tubing. With the wireline technique, 4 1/2 gal of treating fluid contained in the wireline tool are injected directly into perforations made by the tool. There is no opportunity for contamination of the plastic. Each perforation is treated independently. This provides good assurance that each perforation will receive plastic and that none will go untreated. The 4 1/2 gal of treating fluid consolidate a sphere roughly 18 in. in diameter adjacent to the perforations. This consolidated mass has a compressive strength of at least 1,000 psi and retains 60 to 75 percent of the sand permeability. production is from perforations made with this tool. No additional perforating is done. Experience has shown that high production rates can be obtained through these perforations.
Description of Tool
A new wireline tool was designed for this service. The external appearance of the tool resembles a wireline formation tester (Fig. 1). It has two main parts: the mechanical section and the treat section. The mechanical section contains the internal hydraulic system to set the tool in the casing and to operate the control valves. It also contains the perforating gun block. The treat section consists of a pressure amplifier and chambers which contain the fluids to be injected. In operation. two doughnut-shaped packers are forced against the casing by the back-up shoe. The packers prevent contamination of the plastic or loss to the wellbore during injection. Two shaped charges are located in the packer section. one behind each packer. After a seal is effected between the tool and the pipe, the shaped charges are fired, perforating the casing and thus establishing communication between the tool and the formation.
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