Successful Primary Cementing Can Be a Reality
- R.C. Smith (Amoco Production Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- November 1984
- Document Type
- Journal Paper
- 1,851 - 1,858
- 1984. Society of Petroleum Engineers
- 4.3.1 Hydrates, 1.11 Drilling Fluids and Materials, 4.1.2 Separation and Treating, 1.10 Drilling Equipment, 1.6.10 Running and Setting Casing, 4.1.5 Processing Equipment, 1.14 Casing and Cementing, 5.3.2 Multiphase Flow, 2.2.2 Perforating, 2.2.3 Fluid Loss Control, 1.14.3 Cement Formulation (Chemistry, Properties), 1.6 Drilling Operations
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Distinguished Author Series articles are general, descriptiverepresentations that summarize the state of the art in an area of technology bydescribing recent developments for readers who are not specialists in thetopics discussed. Written by individuals recognized as experts in the area,these articles provide key references to more definitive work and presentspecific details only to illustrate the technology. Purpose: to informthe general readership of recent advances in various areas of petroleumengineering.
The most important operation performed on a well is the primary cementingjob at the time of completion. It must primary cementing job at the time ofcompletion. It must achieve complete zonal isolation in the wellbore; that is,obtain a hydraulic seal of cement to casing and cement to formation while atthe same time eliminating mud or gas channels within the cement sheath. Fig. Idepicts the objective. If the cementing operation is not performed correctlyand successfully, the well most likely will never be the total well it couldhave been. A successful primary cementing job requires a positive attitude.commitment, dedication, proper alignment of priorities, and application ofproven technology. This paper presents an overview of primary cementing and theinteraction of the various factors necessary to achieve a successful job.Several references are included that furnish detailed instruction.
Consider the overall primary cementing operation as a chain with threelinks: (1) cementing philosophy, (2) knowledge, and (3) quality control.Although these are separate and distinct links, they are interdependent. Eachis discussed in this paper.
Cementing Philosophy. Through many years of association with cementingoperations, I have arrived at one major conclusion: Primary cementing fieldpractices must go through a major revolution to achieve increased cementingsuccess. This revolution mainly involves a rededication to application oftechnology and materials already available, and requires a change in attitude,commitment, dedication, and setting proper priorities. As summarized in Fig. 2,these factors form the foundation for successful cementing. The adage "mix it,pump it, and bump it" is archaic. The negative attitude ("It's impossible toget a good primary job, so why try?") is a self-fulfilling prophecy. Thepositive attitude must contain a real commitment to a successful job and willinvolve dedication of people, time, and money. The usual response to theforegoing statement is "time and people are not available for such acommitment." Yet time and people always are allocated to repair a poor primarycementing job that can cost from a few thousand primary cementing job that cancost from a few thousand to several hundred thousand dollars. So time, people,and money are available to do the job correctly the first time. What is lackingis the setting of proper priorities. What is the first priority? A successfulcementing job the first time! Usually, the added cost to perform a successfulprimary job is much less than the cost of remedial work primary job is muchless than the cost of remedial work to repair a failure (not to mention thepotential delay or loss of production). In fact. substantial savings arepossible with a successful primary job. possible with a successful primary job.If this cementing philosophy is to work, a team effort is essential. This willinvolve the service company, the operator, and the rig contractor communicatingand cooperating together. From the operator's standpoint, the team effortrequired to handle the varied quality control measures will involve not onlythe drilling foreman, but also the dedication of one or two drilling orcompletion engineers. All personnel must apply the total engineered conceptwhich starts with planning, continues through design, blending, and mixing, andculminates in displacement. The drilling engineer usually is involved intenselyin drilling the well safely and as fast and economically as possible. Hisinterest is directed toward minimizing the possible. His interest is directedtoward minimizing the number of days to reach the target depth. However, hisultimate objective still must be to provide a wellbore suitable forcementing.
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