Infill wells

Deltaic (distributary channel) Isolated or stacked channels usually with fine grained sands. May or may not be in communication Good producers permeabilities of 500-5000mD. Insufficient communication between channels may require infill wells in late stage of development... 

Thermal Recovery Polymer Flooding Infill Wells... 

One category of remaining oil shown in the above diagram is unproducible oil in thin oil rims, which cannot be produced without coning in unwanted oil and/or gas. Horizontal wells are an ideal form of infill well in this situation, and will be discussed in Section 9.3. 

Dutton Flanders examined the diagenesis and reservoir quality of the East Ford Field, Texas, which is undergoing a carbon dioxide flood. The compartmentalization of the arkosic sandstone reservoir is chiefly controlled by authi-genic calcite layers associated with the tops and bottoms of turbidite sandstone units. Gases produced from zones below low permeability calcite cemented sandstone intervals in new infill wells have high carbon dioxide contents. These, together with geophysical log interpretations, indicate that the calcite-cemented zones are laterally continuous and act as vertical barriers in the reservoir. 

There are many faults whose cUstribution is complex in Daqing Oilfield SW-II (Wei Jide, 2001 j.The basic well pattern is put into development by Une well pattern in 1964. In 1990, primary infill wells pattern uses two sets of layer system to develop S and PII poor oil layers. Secondary infill wells pattern is used to adjust S and PII thin and poor oil layers and untabulated reservoir in 1998. In 2000, as P15-1-61—7 oil layers and PI 1-4 oil layers have differences in geologic feature, the polymer flooding is only put into development in PII—4 oil layers. So far, there are only some wells of line well pattern is under production in PI5-F61—7 oil layers. And the flood pattern of P I5-F61—7 oil layers is very incomplete. 

The drilling of an infill well a producer, an injector or an observation/sampler well was considered. After sound evaluation of pros and cons of each option, including feasibility, value of information and economics, the choice made was to drill an infill sampler well close to an injector, including a production target in a deeper horizon, has been retained. The objective will be to sample water with polymer in that well, and to demonstrate that the in-sitn properties of the polymer solution are consistent with retained hypotheses, under the salinity and concentration conditions of the sample. 

Keywords production decline, economic decline, infill drilling, bypassed oil, attic/cellar oil, production potential, coiled tubing, formation damage, cross-flow, side-track, enhanced oil recovery (EOR), steam injection, in-situ combustion, water alternating gas (WAG), debottlenecking, produced water treatment, well intervention, intermittent production, satellite development, host facility, extended reach development, extended reach drilling. 

Infill drilling is another possible way to extend production. For a variety of reasons, some oil may not be available to the original wells in the resei voir. Some wells may be spaced too far apart to capture the oil between them. Gas or water flooding may have bypassed some oil, or fractures or faults may block off certain parts of the reservoir from the rest so that they cannot be drained from existing wells. In these cases drilling new wells between existing ones call be an effective way to capture more of the resource. 

Secondary recovery, infill drilling, various pumping techniques, and workover actions may still leave oil, sometimes the majority of the oil, in the reservoir. There are further applications of technology to extract the oil that can be utilized if the economics justifies them. These more elaborate procedures are called enhanced oil recovery. They fall into three general categories thermal recoveiy, chemical processes, and miscible methods. All involve injections of some substance into the reservoir. Thermal recovery methods inject steam or hot water m order to improve the mobility of the oil. They work best for heavy nils. In one version the production crew maintains steam or hot water injection continuously in order to displace the oil toward the production wells. In another version, called steam soak or huff and puff, the crew injects steam for a time into a production well and then lets it soak while the heat from the steam transfers to the resei voir. After a period of a week or more, the crew reopens the well and produces the heated oil. This sequence can be repeated as long as it is effective. 

Thick compact exterior grade laminates are self-supporting and suitable for applications such as infill panels or the decorative cladding of exterior walls. They are available with surfaces of anodized aluminium and coloured lacquer-coated foil as well as normal melamine. 

We also screened group 1-15 metal chlorides searching for Lewis acids stable in aqueous solvents (Table 14-3) [22], As a model, the reaction of benzaldehyde with (Z)-l-phenyl-l-(trimethylsiloxy)propene was selected. In the first screening, the chloride salts of Fe(II), Cu(II), Zn(II), Cd(II), Infill), and Pb(II) as well as the rare earth metals [Sc(III), Y(III), Ln(III)] gave promising yields. When the chloride salts of B(III), Si(IV), PflU), P(V), Ti(IV), V(III), Ge(IV), Zr(IV), Nb(V). Mo(V), Sn(IV), Sb(V), Hf(IV), Ta(V), W(VI), Re(V), and Tl(III) were used, decomposition of the silyl enol ether occurred rapidly and no aldol adduct was obtained. This is because hydrolysis of such metal chlorides is very fast and the silyl enol ether was protonated and then hydrolyzed to afford the corresponding ketone. On the other hand, no product or only a trace amount of the product was detected using the metal chloride salts of Li(l), Na(I), Mg(II), Al(III), K(I), Ca(Il),... 

The terms EOR and lOR should refer to reservoir processes. Any practices that are independent of the recovery process itself should not be grouped into either EOR or lOR. Such practices include reservoir characterization, reservoir simulation, use of hardware and equipment (pumps, down-hole separators, etc.), use of special well types (horizontal wells, multilaterals, smart wells, etc.), improved reservoir management, infill drilling, and so on. Oil here means hydrocarbon, including oil and natural gas. 

A field test was condncted in the well 1-14 pattern in the eastern block of the Gndao field (Wang et al., 2005). The test formation was Ng3-4, and the formation thickness was 13 m. The clay content was 11.8%. In this test, the air permeability was 250 to 3165 md, with an average 1782 md, and the porosity was 30 to 32%. The initial reservoir temperature was 71°C. Before the test, the temperature was 64°C. The oil viscosity at reservoir conditions was 50 to 150 mPa s, and the formation TDS was 3850 mg/L. In the test well pattern, there were 1 injector, Dl-14, and 11 producers around the injector. In April 2004, infill drilling and conformance control were conducted. The water cut decreased only 2%. By January 2005, the water cut reached 96%. 

Fig. 4 Laboratory apparatus for the preparation of ethyl- and propyldiboranes. A, Four-liter three-necked flask B, one-liter dropping funnel with pressureequalizing arrangement C1,C2, reflux condensers (condenser fluid is Aliphatin, a Cio-Cu paraffin mixture, b.p. ca. 190-230, available from British Petroleum Corp.) D, KPC (precision-fit) stirrer with metal blades E1,E2, bubble counter filled with Aliphatin F1,F2, 250-ml. flasks with gas inlet tubes G, two-liter three-necked flask H, vacuum stopcocks I, gas inlet tube with gas-dispersing frit K, 250-ml. two necked flask Infilling attachment M, polyethylene tubing N, magnetic stirrer O, thermometer well.

The Standard Guardrail A commonly specified barrier is the standard guardrail illustrated in Figure 11-2. It has vertical supports, typically spaced 10ft or less apart. It has three horizontal parts top rad, middle raU, and toe board. Infill between these parts is important as well. 

Soft story This attribute is determined visually based on the height difference as well as a significant difference in the rigidities of stories, including the potential contribution of the infill walls, if possible. 

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