In this article, we will discuss the practical right steps for the single-stage primary casing cementing job procedure in oil and gas wells. We have also discussed the multi-stage cementing job in one of our articles before. And we have summarized the important tips for successful primary cementing & Casing Cementing calculations to assist you …
This stage of the Cementing in drilling process comprises the slurry preparation and pumping equipment at the surface and the down-hole hardware. A vast array of equipment and tools are available from specialized manufacturers and Service Companies and a brief description of the various items, to explain their purpose and function in the cementing processes …
ACP / ECP annular casing packers (also known as external casing packer) are one of the packers types that is popular because they provide improved sealing and centralization (check also: Permanent Packers). They are used to: Prevent gas migration. Reduce the gas-to-oil production ratio. Reduce or prevent water production. Isolate production or injection zones. Avoid …
Stage cementing tool, consisting of stage collars and port collars, is placed within any types of casing string to provide an intermediate passage to the annulus (Fig. 1). The collars are generally made of match-grade steel. They may be available in special weight ranges to optimize strength and internal dimensions. Stage cementing tool is generally …
Figure A is a schematic flow diagram of cement-slurry preparation that indicates the steps performed at the central storage location and at the wellsite. Each function in the flow diagram also represents a major piece of equipment. Some functions may be combined into a multipurpose “cementing unit.” For economic reasons, a cementing unit as one …
All current cementing pumps are of the reciprocating type, mostly with three plungers (triplex) and springloaded suction and discharge valves Figure 1. The transformation of the rotating motion of the input shaft into the reciprocating motion of the plungers is generally accomplished either by a system of a crankshaft and connecting rods or by a …
Scratching devices as casing scratchers are external devices designed to remove immobile mud from the wellbore and mud cake from the wellbore wall (Fig. 1). These devices are categorized by how aggressive they are. Casing Scratchers Types The basic springloaded bristle scratcher is more aggressive than the cable scratcher (also known as a wellbore wiper). …
Cementing head is a manifold system that is installed on the top of the casing which allows the cement slurry to be pumped from the cement unit down any of the types of casing string. The cement head is also used for releasing the top and bottom cement plugs. A “cement head” is screwed into …
Drilling muds are designed to facilitate drilling operations and provide proper cuttings transport. They are not necessarily conducive to efficient mud displacement, logging, or completion operations. Therefore, it is often necessary to condition the mud (i.e., to modify mud properties). Before placing cement (Cementing in drilling) in the wellbore, two mud characteristics can be changed—density …
Inflatable service tools have been used in the oil and gas industry for more than 50 years to perform a variety of remedial workovers. Inflatable well packers, bridge plugs, and cement retainer is used in open holes, cased holes, slotted casing liners, and gravel-pack screens in oil and gas wells, but they should be used …