oil and gas limited partnership
partnership consisting of one or more limited partners and one or more general partners that is structured to find, extract, and market commercial quantities of oil and natural gas. The limited partners, who assume no liability beyond the funds they contribute, buy units in the partnership, typically for at least $5,000 a unit, from a broker registered to sell that partnership. All the limited partners' money then goes to the general partner , the partner with unlimited liability, who either searches for oil and gas (an exploratory or wildcat well), drills for oil and gas in a proven oil field (a developmental drilling program ), or pumps petroleum and gas from an existing well (a completion program ). The riskier the chance of finding oil and gas, the higher the potential reward or loss to the limited partner. Conservative investors who mainly want to collect income from the sale of proven oil and gas reserves are safest with a developmental or completion program.
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TECHNICAL DESCRIPTION OF THE DRILLING RIG
The rig ZJ40/2250DB is a new kind of AC-VFD-AC drive 1000hp land drilling rig with rated drilling depth up to 4000m(13,123ft) with 114mm(4 ½”DP) or to 3500m(11,483ft) with 127mm(5”DP). Rated maximum static hook load is 2250KN. On the basis of comparing different kinds of rigs of 4000 meters grade, we took many advantages of different rigs and, at the same time, brought forth new ideas to the rig. Some of the techniques we used on the new rig have gotten patents. With many characteristics such as advanced techniques, small wellsite possession, high drive efficiency and the capability of cluster wells drilling, the rig is more suitable for drilling on the smaller wellsite when necessary. For example when drill in mountain area, farmland or in the city.
The main advantages of this rig are as the following:

When rig up, the mast is assembled with several sections and lifted vertically so that when rig up, the necessary installation area possession of the rig is smaller than those assembled horizontally. Additionally, the lifting of the mast and the substructure uses two set of hydraulic winch and a very small hydraulic pump station, which made the lifting of the mast and the substructure very simple and doing nothing with the drawworks.
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